PowerVac G. Service and Parts Manual G3 G5 G7 G6 G10 G14. Model Numbers: Single Vac Units. Twin Vac Units FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

Transcription

1 PowerVac G Model Numbers: Single Vac Units G3 G5 G7 Service and Parts Manual Twin Vac Units G6 G10 G14 FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY (10/3/17) 2010 Midmark Corp. 60 Vista Drive Versailles, OH USA

2 GENERAL INFORMATIOn access procedures Table of Contents General Info Section A Section B Symbols...iii Ordering Parts & SN location...iii Specifications... iv Model Identification & Compliance Chart... v Warranty... vi Troubleshooting Vacuum System Operation... A-2 Electrical System Operation... A-3 Troubleshooting Chart... A-4 VFD Error Codes... A-6 Testing & adjustments Door Limit Switch & On/Off Switch... B-2 Float... B-5 Check Valve... B-8 Motor & Pump... B-10 Master Control Panel... B-15 VFD (Variable Frequency Drive)... B-18 Line Filter... B-20 Fuse & Transformer... B-22 PC Board... B-25 Contactor... B-28 Pressure Sensor... B-30 Fan... B-32 Gauge... B-34 Separator Tank... B-35 Vacuum Adjustment... B-36 VRV... B-37 Digity Linked Files Section E Section D Section C Front Cover... C-2 Top Plate... C-3 Electrical Cover... C-4 Back Cover... C-5 VFD Covers... C-6 WIRING DIAGRAMS PowerVac G (Electrical Box)... D-2 VFD (Variable Frequency Drive)... D-5 Motor Connections... D-6 PC Board... D-7 Exploded Views Single Models... E-2 Twin Models... E-3 REpair procedures & forms Single to Twin Conversion (*) Indicates multiple pages due to model / serial number break(s). Midmark Corporation 2010 SF-1943 [Revised: 03/30/16] ii

3 General Information Symbols danger Indicates an imminently hazardous situation which will result in serious or fatal injury if not avoided. This symbol is used only in the most extreme conditions. warning Indicates a potentiy hazardous situation which could result in serious injury if not avoided. Caution Indicates a potentiy hazardous situation which may result in minor or moderate injury if not avoided. It may also be used to alert against unsafe practices Equipment Alert Indicates a potentiy hazardous situation which could result in equipment damage if not avoided. Used for special instructions or additional information. The symbols below may be used in this manual to represent the operational status of table functions and components. Indicates the function / component is working properly. No action required. Indicates the function / component is working, but a problem exists. Indicates the function is not working at, or that the component is faulty. Ordering Parts The following information is required when ordering parts: Serial number & model number Part number for desired part (Refer to Section E: Exploded Views & Parts Lists) Non-warranty parts orders may be faxed to Midmark using the Fax Order Form in the back of this manual. For warranty parts orders, c Midmark s Technical Service Department with the required information. Hours: 8:00 am to 5:00 p.m. EST (Monday thru Friday) Phone: Midmark ( ) Serial Number Location Serial Number Label Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] iii

4 powervac G Specifications Classifications: Class 1, Type B Applied Part Model Max users base unit hxwxd separator hxwxd Actual Weight (Lbs.) Total hp Voltage Amps hertz Recommended breaker size (Amps) Inlet connection size (IN.) Fuses drain connection size (IN.) G x 22 x 20 Each 34 x 22 x 22 Each base unit separator /2 1/8 A, 250V Type T 1 1/2 G x 22 x 20 Each 34 x 22 x 22 Each base unit separator /2 1/8 A, 250V Type T 1 1/2 G x 22 x 20 Each 34 x 22 x 22 Each base unit separator /2 1/8 A, 250V Type T 1 1/2 G x 22 x 20 Each 34 x 22 x 22 Each base unit separator x /8 A, 250V Type T 1 1/2 G x 22 x 20 Each 34 x 22 x 22 Each base unit separator x /8 A, 250V Type T 1 1/2 G x 22 x 20 Each 34 x 22 x 22 Each base unit separator x /8 A, 250V Type T 1 1/2 Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] iv Specifications

5 Model Identification / Compliance Chart - PowerVac G Model Description UL Complies To: CAN / CSA 22.2, #601.1-M90 EN (EMC) VAC +/- 10% Electrical Ratings: G3 PowerVac G Dry Vacuum System - Single - 3 to 5 User G5 PowerVac G Dry Vacuum System - Single - 5 to 7 User G7 PowerVac G Dry Vacuum System - Single - 7 to 10 User G6 PowerVac G Dry Vacuum System - Twin - 6 to 10 User G10 PowerVac G Dry Vacuum System - Twin - 10 to 14 User G14 PowerVac G Dry Vacuum System - Twin - 14 to 20 User Amps Cycles (Hz) Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] v

6 Warranty Midmark Corporation ( Midmark ) warrants to the original purchaser its new PowerVac G products and components (except for components not warranted under Exclusions ) manufactured by Midmark to be free from defects in material and workmanship under normal use and service. Midmark s obligation under this warranty is limited to the repair or replacement, at Midmark s option, of the parts or the products the defects of which are reported to Midmark within the applicable warranty period and which, upon examination by Midmark, prove to be defective. Applicable Warranty Period The applicable warranty period, measured from the date of instation for the original user, sh be (5) years or 10,000 usage hours (whichever comes first) for warranted products and components. Ten (10) years or 20,000 usage hours (whichever comes first) for the pump only. Exclusions This warranty does not cover and Midmark sh not be liable for the following: (1) repairs and replacements because of misuse, abuse, negligence, alteration. accident, freight damage, or tampering; (2) products which are not insted, used, and properly cleaned as required in the Midmark Instation manual and or PowerVac G Care Guide for this applicable product; (3) products considered to be of a consumable nature; (4) accessories or parts not manufactured by Midmark; (5) charges by anyone for adjustments, repairs, replacement parts, instation, or other work performed upon or in connection with such products which is not expressly authorized in writing in advance by Midmark. Exclusive Remedy Midmark s only obligation under this warranty is the repair or replacement of defective parts. Midmark sh not be liable for any direct, special, indirect, incidental. exemplary, or consequential damages or delay, including, but not limited to, damages for loss of profits or loss of use. No Authorization No person or firm is authorized to create for Midmark any other obligation or liability in connection with the products. THIS WARRANTY IS MIDMARK S ONLY WARRANTY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED. MIDMARK MAKES NOT IMPLIED WARRANTIES OF ANY KIND INCLUDING ANY WARRANTIES OF MECHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. THIS WARRANTY IS LIMITED TO THE REPAIR OR REPLACEMENT OF DEFECTIVE PARTS. Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] vi

7 Section A Operation & Troubleshooting Vacuum System Operation...A2 Electrical System Operation...A3 Troubleshooting...A4 VFD Covers...C-6 Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] A-1

8 Vacuum System Operation Air, water, and solids from the operatory are pulled into the separator. Air is expelled out through the pump exhaust while water and solids f to the bottom of the tank. The vacuum in the separator keeps the check valve to the drain closed and the tank graduy fills. The rising fluid level eventuy closes the top float switch, which turns the pump off. Since vacuum is no longer being maintained, the check valve opens owing water and solids to drain from the separator. The upper and lower reed switch floats interact as a latching circuit with the internal relay to release upon drain below the bottom float. : If the power is shut off, the unit will drain automaticy due to a loss of vacuum regardless of the water level in the tank. When the tank drains enough to open the bottom float switch, the pump starts running again. This restores vacuum and closes the check valve. : if the power is turned off, tank will drain completely. Earlier production units had three reed switch floats. The middle float was not used and is not insted in current production units. Drain Exhaust From Operatory Check Valve (Closed) Pump Operating Electrical Operation...A3 Troubleshooting...A4 Vacuum Air (Atmospheric Pressure) Water and Solids When no instruments (suction tips) are being used (HVEs shut off for 5 seconds or more) the system goes into sleep mode to save energy. Sleep mode pressure is set to 6 Hg. Vacuum pressure will ramp down from its normal operating pressure to sleep mode pressure when the unit goes to sleep. The sleep mode pressure is maintained at 6 Hg until the variable frequency drive (VFD) senses an increase in vacuum pressure is required when an instrument (suction tip) has been opened. The VFD will then speed up the motor to increase vacuum pressure to the normal operating pressure. Check Valve (Open) Drain Pump Stopped Check Valve (Closed) Drain Exhaust AA2267 Pump Operating (Sleep Mode) Midmark Corporation 2010 SF-1943 [Revised: 9/20/11] A-2

9 ON CTS Electrical System Operation When Main input power supply (230V) is on, it is supplying line voltage to the vacuum pump electrical system. The Main input power supply (230V) is supplied to the contactor, thermostat, fans, transformer, variable frequency drive (VFD), and the line filter. When the On/Off switch or master control switch are in their off state or the front panel is removed from the unit, the contactor will remain open and the input power will be connected to the input side of the contactor, thermostat, fans, and the transformer only. Vacuum Operation...A2 Troubleshooting...A4 Timer Bd. Std. after SN: V units prior to this can be updated When the contactor is energized, it closes and connects the main input power supply to the line filter. Main input power supply is then applied to the VFD through RL1 and SR2 (single phase). YL YL The transformer s output sends 24 volts AC to the PC board. 24 volts AC power is used to control the door limit switch, hour meter, and floats. The electronics on the PC board convert 24 VAC to 24 VDC for the pressure sensor though the means of a connector. Transformer Pressure Sensor When instruments (suction tips) are in use, the vacuum pump is running and claws are turning to build up vacuum pressure. The pressure sensor is constantly measuring the amount of vacuum pressure. When the pressure level drops below the vacuum set point (12 Hg factory setting), the pressure measurement initiates the VFD to speed up the motor. When pressure is above set point the VFD slows the motor down. Contactor Line Filter Fans Themostat VFD Box Parel Connection When the vacuum is shut off from the remote switch the timer starts and will turn on the vacuum for one minute every two hours. (Standard on new units, older units can be upgraded) 230 VAC Line Voltage AA2486i On twin units a parel cable (4-pin Master / 6-pin Slave) connects the two base units on the side of the electrical box. The plumbing is connected using a tee assembly. The parel connection is controlled between variable frequency drives in a twin configuration. Twin units run the same as a single unit. Keypad, hour meter and fans are located on the outside of the base unit. Pressure sensor and float are located on the separator tank. Midmark Corporation 2010 SF-1943 [Revised: 11/2/15] A-3

10 Troubleshooting Chart Problem Display/Symptom Cause Check Action Motor not running Or Breaker keeps tripping. NA No power. Check on/off switch on front of the base. Verify on/off switch is in the on postion. Low Voltage Harness disconnected/loose. Faulty Switch Check disconnect box/ circuit breaker (Main). Check door limit switch, on/off switch and master control panel harness. Check LED light D4, if ON only check Low Voltage. If LED light is not on, preform checks on Door Limit switch, On/Off switch, and master control panel. Refer to: Section B PC Board to check LED light, Door Limit Switch, On/Off Switch and Master Control Panel. Verify disconnect box/circuit breaker (Main) is in the on postion. Secure/Replace harness connections. Replace Switch NOTE: When working on twin unit unplug parel harness Separator tank not draining. "Possible Clog in tank. Remove lid to see if tank is full. Check valve is stuck closed. Refer to section B check valve. Remove clog. Repair/ Replace check valve Turn power off and unplug float harness from base unit. Turn unit back on, if the unit runs check Section B: Float Replace Float Assembly Wire harness between VFD and PC board loose or broken. Check for loose or broken wire harness between VFD and PC board. Ensure grey cable is plugged into VFD and PC board. Secure/Replace harness connections. Pump is locked up. Feel for pump pulley drag or sticking. Refer to section B pump. Contact Midmark Technical Service PC board Malfunctioning. Turn main power supply on. (Keep unit turned off.) Unplug wire harness from J6 on PC board. Test resistance. Set meter to Ώ. Meter Reading > 1 Ώ Refer to Section B PC Board Replace Main PC Board Check Daughter Card. Refer to Section B Daughter Card Replace Main PC Board Contactor not working properly. Check Contactor. Refer to: Section B Contactor Replace Contactor. Midmark Corporation 2010 SF-1943 [Revised: 11/2/16] A-4

11 Troubleshooting Chart Problem Display/Symptom Cause Check Action NOTE: When working on twin unit unplug parel harness Operatory has low or no suction. NA VFD not working properly. Motor bad. Motor not running. Leaking or loose connection. Check if there is an error code displayed. Refer to: Section A VFD Error Code Chart Lights not working on PC board check Fuse. Refer to: Section B Fuse and Transformer. Lights not working on VFD, check Line Filter. Refer to: Section B Line Filter Lights not working on VFD, check Contactor. Refer to: Section B Contactor Lights not working on PC board check transformer Refer to: Section B Fuse and Transformer. Lights not working on VFD. Check Ohms at J6 terminal. Greater than 5 ohm. Refer to Section B PC Board (main power on, unit power on, J 6 Unplugged) Lights not working on VFD. Disconnect drive harness at J6 Location to check for 24V DC. If Voltage is not present Ohm out drive harness. Refer to section B VFD Variable Frequency Test. Lights not working on VFD. Check for line Voltage ( V) at incoming terminal strip on VFD. If Line voltage is present. Refer to section D Variable Frequency Drive Preform motor checks. Refer to: Section B Motor & Pump See Problem, motor not running or breaker keeps tripping Check hoses and bulkhead fittings. Check Separator lid gasket. Follow required actions in testing. Replace Fuse Secure/Replace harness connections. Replace Contactor Replace Transformer Replace PC Board Replace Drive Harness Replace VFD Replace Motor See Action, motor not running or breaker keeps tripping. Secure/Replace hoses or bulkhead connections. Replace Separator Lid Gasket Exhaust Hose Clogged Pressure sensor not working properly. Check drain line check valve. Refer to: Section B Check Valve Remove exhaust hose to see if suction increases. if suction increased check for clog. Check pressure sensor. Refer to: Section B Pressure Sensor Replace Check Valve. Unclog or replace exhaust line Replace pressure sensor. Midmark Corporation 2010 SF-1943 [Revised: 11/2/16] A-5

12 Troubleshooting Chart Problem Display/Symptom Cause Check Action Motor cutting out or running at a reduced speed. Motor running at top speed the time. N/A NA Ambient temperature too high. Contactor not working properly. Check Equipment Room Temperature should be 40 to 104 degrees Fahrenheit or 4-37 Celsius. Check Contactor. Refer to: Section B Contactor Refer to instation manual site requirements Replace Contactor Pump is locked up. Refer to: Section B Pump Contact Midmark Technical Service Exhaust Hose Clogged Remove exhaust hose to see if suction increases. if suction increased check for clog. Unclog or replace exhaust line Motor not running. Pressure sensor not working properly. See Problem, motor not running or breaker keeps tripping. Check pressure sensor. Refer to: Section B Pressure Sensor See Action, motor not running or breaker keeps tripping. Replace Pressure sensor Plumbing lines leaking. Check office plumbing system for leaks. Repair/Replace Plumbing Lines VRV Malfunctioning Check VRV. Refer to: Section B VRV Adjust/Replace VRV Oil Leak Leaking Oil Oil Reservoir is overfilled. Check site glass. Refer to section B Pump Drain Oil Pump is overheating Check ambient temperature in the room. Temperature should be 40 to 104 F or 4 to 40 C Pump is locked up. Pump pulley not spinning freely. Contact a certified specialist to adjust temperature. Check Clearance around unit. ow 12inch on the Adjust base unit to clearance specifications. front and right side and ow 6 inches on the left side and back Check if fans are working. Refer to section B Replace fans Fans Oil leak is persistent N/A Contact Midmark Technical Service P-Trap is clogged. Remove drip leg to check for plug. Remove clog. Go to next step! Water in pump. remove drain plug at the back of the pump exhaust Drain water. chamber. Refer to section B pump. Midmark Corporation 2010 SF-1943 [Revised: 11/2/16} A-6

13 VFD (Variable Frequency Drive) Error Codes Problem Display/Symptom Cause Check Action VFD Error Code ol1 Motor Overload Pump is locked up. Refer to: Section B Pump Contact Midmark Technical Service ol2 Drive Overload Pump is locked up. Refer to: Section B Pump Contact Midmark Technical Service ol3 Over torque Detection 1 ol4 Over torque Detection 2 FbH Excessive Pressure (Feedback Sensor) FbL Feedback Loss (Feedback Sensor) GF (Ground Fault) Pump is locked up. Refer to: Section B Pump Contact Midmark Technical Service Pump is locked up. Refer to: Section B Pump Contact Midmark Technical Service Pressure sensor failure. Refer to: Section B Pressure Sensor Replace pressure sensor. Plumbing System is not Complete Harness not properly connected to base unit or pressure sensor on tank. There is a broken wire in one of the harnesses. The 24V power supply on the control PCB daughter card has failed. Check unit/units are hooked up in the operatory j-box. Check HVE, saliva ejector tips are closed Check clean outs are closed Check hoses and bulkhead fittings. Check Separator lid gasket. Check drain line check valve. Refer to: Section B Check Valve Refer to: Section B Pressure Sensor Check PC Board Pressure Sensor Harness at J13. Check Daughter Card. Refer to Section B Daughter Card Secure Connections at J-Box Close Tips Close Clean Outs Secure/Replace hoses or bulkhead connections. Replace Separator Lid Gasket Replace Check Valve. Replace pressure sensor. Repair/Replace PC board pressure harness. Replace Main PC Board Pressure sensor failure. Refer to: Section B Pressure Sensor Replace pressure sensor. One of the wires in the motor harness is creating a short circuit. The motor insulation is damaged. Refer to Section D: Motor Connections Refer to Section D: Motor Connections Replace motor harness Replace Motor Midmark Corporation 2010 SF-1943 [Revised: 11/2/16] A-7

14 VFD (Variable Frequency Drive) Error Codes Problem Display/Symptom Cause Check Action VFD Error Code Continued LF Output Phase Loss LF2 Output Current Imbalance oc Overcurrent Uu1 or Uu Undervoltage VFD has loose connections. Check red(v/t2), blue(w/t3) & black(u/t1) wire connections on the VFD and the motor. Refer to Section D VFD Damaged Motor Refer to Section D: Motor Connections Replace Motor Bad drive transistor Contact Midmark Technical Service Replace VFD VFD has loose connections. Check red(v/t2), blue(w/t3) & black(u/t1) wire connections on the VFD and the motor. Refer to Section D VFD Damaged Motor Refer to Section D: Motor Connections Replace Motor Bad drive transistor One of the wires in the motor harness is creating a short circuit. The motor overheated repeatedly causing insulation to be damaged Contact Midmark Technical Service Refer to Section D: Motor Connections Refer to Section D: Motor Connections Secure/Replace motor harness Secure/Replace motor harness Replace VFD Replace motor harness Replace motor Pump locked up Refer to Section B: Pump Contact Midmark Technical Service The power has been Check if unit was powered off. Turn unit back on. momentarily interrupted. Incoming voltage is low. Check incoming voltage. ( ) Contact a certified electrician. Faulty Switch Output connections from the contactor are loose. Input power connections to the VFD are loose The internal VFD circuitry has worn out. Check On/Off switch. Refer to: Section B On/Off Switch Check Door Limit switch. Refer to: Section B Door Limit Switch Check Master control panel. Refer to: Section B: Master Control Panel Check wire connections on contactor. Check wire connections on VFD Refer to section B VFD Variable Frequency Test. Replace ON/Off switch. Replace Door Limit Switch Replace Master Control Panel Secure Connections. Secure Connections. Replace VFD Midmark Corporation 2010 SF-1943 [Revised:11/2/16] A-8

15 VFD (Variable Frequency Drive) Error Codes Problem Display/Symptom Cause Check Action VFD Error Code Continued ou Overvoltage Incoming voltage high Check incoming voltage. Contact a certified electrician. oh or oh1 Heatsink Overheat SC Communication Error Power surge. Ground fault in the VFD circuit causing the capacitors to overcharge. Ambient temperature is too high. Check incoming voltage. Refer to Section B Contactor Perform continuity check on motor harness for shorts. Refer to section D: Motor Connections Perform continuity check on the motor windings for shorts. Refer to section D: Motor Connections Check room temperature. Refer to Instation Manual - Specifications Cycle power to unit. Replace Motor Harness Replace Motor ow room to cool or add ventilation fan to room. Pump locked up Refer to section B Pump Contact Midmark Technical Service VFD Cooling Fan has malfunction. Check VFD Fan. Replace VFD. Front display board not communicating. Main drive controller not communicating Remove Ethernet cable from back of front display. Re power. If no error code on main drive controller. Remove Ethernet cable from back of front display. Re power. If error code remains on main drive controller. Replace front display board. Replace VFD Midmark Corporation 2010 SF-1943 [Revised: 11/2/16] A-9

16 Section B Testing & Adjustments Door Limit Switch & On/Off Switch... B-2 Float... B-5 Check Valve... B-8 Motor & Pump...B10 Master Control Panel... B-15 Low Voltage... B-17 VFD (Variable Frequency Drive)... B-19 Line Filter... B-20 Fuse & Transformer... B-22 PC Board... B-25 Contactor... B-28 Pressure Sensor... B-30 Fan... B-32 Gauge... B-34 Separator Tank... B-35 Vacuum Adjustment... B-36 VRV... B-37 Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-1

17 Door Limit Switch & On/Off Switch (Circuit Breaker) Door Limit Switch Test...B-3 On/Off Switch Test...B-4 Location & Function With facility power (230 VAC) supplied to the system... The transformer continuously supplies 24 VAC to the normy-open door limit switch. With the front access cover in place... The plastic bumper on the top right side of the access cover, trips the door limit switch causing it to close. When the limit switch is closed, 24 VAC flows thru the switch to the PowerVac G circuit breaker (On/Off) switch. With the circuit breaker switch ON, current is supplied to the remote w switch (if applicable). Door Limit Switch If the facility does not have a remote w switch, the PowerVac G circuit breaker serves as the On/Off switch for the system. When the front access cover is removed... The door limit switch opens and stops current flow to the PowerVac circuit breaker. This is a safety feature that prevents the system from operating with the cover removed. On/Off Switch (Circuit Breaker ) Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-2

18 COM NC NO Door Limit Switch Test Caution Door Limit Switch is a safety device. If switch is not working, do not bypass. warranty will be void if switch is bypassed. If both tests fail, it must be replaced. Step 2: Turn power off. Remove front cover. : Refer to Section C: Front Cover. Door Limit Switch Function...B-2 On./Off Switch Testing...B-4 Front Cover Access...C-2 Step 1: Turn power off at on/off switch and main power supply box. Remove electrical cover. Turn power on at on/off switch and main power supply box. Check to see if D4 LED light is on. If light is on, door limit switch is ok. If light is off, continue with step 2. Step 5: Remove mounting screw for door limit switch. Disconnect electrical leads. Mounting Screw When working on Twin units, unplug parel harness. : Refer to Section C Electrical Cover Caution During this step, the motor belt and pulley may spin with front cover off. Stay clear and keep everything out of the vacuum base! Step 3: Turn power on and depress activation button with a screwdriver. : If motor starts up, quickly take pressure off switch. Plastic bumper may be obstructed or damaged. Check plastic bumper on door for damage. If damaged, switch it with plastic bumper on opposite side of door until a replacement can be ordered. If motor doesn t start, continue to step 4. Step 4: Turn power off. With switch untripped... Meter Reading OL less than 5 ohms Required Action Limit switch - OK Replace limit switch Caution When testing components with power on use care to prevent electrical shock. Step 7: Inst front cover. Activation Button Step 6: Test continuity. Set meter to Ώ. Place meter probes on COM and NO terminals. : Check switch tripped and untripped. With switch tripped... Meter Reading OL less than 5 ohms AA2290 Required Action Replace limit switch Limit switch - OK Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-3

19 On/Off Switch (Circuit Breaker) Test Step 1: Turn power off at on/off switch and main power supply box. Remove electrical cover. Turn power on. Check to see if D4 LED light is on. If light is on, on/off switch is ok. If light is off, continue with step 2. : Refer to Section C Electrical Cover When working on Twin units, unplug parel harness. Caution When testing components with power on use care to prevent electrical shock. Door Limit Switch Function...B-2 Door Limit Switch Testing...B-3 Front Cover Access...C-2 Step 2: Remove front cover. : Refer to Section C: Front Cover. Step 4: Connect switch leads and inst front cover. Step 3: Test continuity. Set meter to Ώ. Disconnect leads from switch terminals. Place meter probes on COM and NO terminals. : Check switch tripped and untripped. AA165501i With switch untripped... Meter Reading Required Action OL Switch - OK less than 5 ohms Replace Switch With switch tripped... Meter Reading Required Action OL Replace Switch less than 5 ohms Switch - OK Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-4

20 Float Assembly Location & Function Float Wire Connection Check Float...B-6 On earlier production units the float assembly contained three float (reed) switches mounted on a bracket at different intervals. Current units only have two float switches. The reed switch has contacts that remain open until the liquid in the separator rises, causing the float to rise until the magnet contacts the reed switch. When the magnet contacts the reed switch, the open contacts inside the reed closes. When the top float switch closes, the vacuum pump stop running until the bottom float opens and the cycle starts again. The upper and lower floats interact as a latching circuit with the internal relay to release upon drain below the bottom float. The magnet in the float is to activate the reed switch within the stem. Earlier production units had three reed switch floats. The middle float was not used and is not insted in current production units. Magnet Reed Switch Contacts are Open Until Magnet Closes Float Float To check if float switches are preventing pump from running... A) Turn power off at on/off switch. B) Remove float wire connection from rear of base by un-threading connector and removing. C) Turn power back on at on/off switch. D) If pump runs the tank is either full (not draining) or there is a issue with the floats proceed to next page. E) If the pump doesn t run proceed with troubleshooting the pump base. Equipment Alert Running pump with float wire connection removed from base other than to briefly troubleshoot can cause damage to the pump. Check Float connection removed from base Result Pump starts running Pump still not running Required Action Troubleshoot floats Troubleshoot Pump Midmark Corporation 2010 SF-1943 [Revised: 11/2/16] B-5

21 Float Assembly Check Bottom Float Down Position Closed Position Float Function...B-5 Float Harnes Continuity...B-7 Section C - Electrical Cover Access...C-1 A quick test to see if the floats are preventing the pump from running (full tank) is to to unplug the float switch asm from the front of the vacuum base. The pump will run if the issue is with the floats or tank is full. This is for testing purposes only! Continuing to run the vacuum with this connector unplugged can cause damage to the pump. Earlier production units had three reed switch floats. The middle float was not used and is not insted in current production units. When working on Twin units, unplug parel harness. To check float switches... A) Turn power off at on/off switch and main power supply box. B) Remove gasket on separator lid. C) Lift lid/float assembly out of tank and lay across top of tank, put floats in down position. D) Remove electrical panel cover. E) Turn supply power and unit ON. F) Set meter to Ώ. G) Lift bottom float to closed position. Measure resistance from COM to BOT, MID and TOP at J4 on PC board. Verify bottom float LED light is On, on the PC board while float is closed. H) Repeat step G for the middle and top floats. I) With floats closed, lower the top float to the down position, then middle float, and finy the bottom. The motor should not start until the bottom float is down. : Verify readings are within range. If not, check float harness continuity on next page. BOT At J4 Check Each Connection (BOT, MID & TOP) to the Last One (COM) MID TOP J4 COM R16 Floats J11 LED s on PC board illuminate to indicate the following... D5 BOTTOM FLOAT - bottom float switch is closed. D10 MIDDLE FLOAT - middle float switch is closed. D7 TOP FLOAT - top float switch is closed. LED Lights on PCB Midmark Corporation 2010 SF-1943 [Revised: 9/20/11] B-6 24 D7 D9 R13 Top Float D10 D8 R10 Middle Float R7 Bottom Float D5 D6 AA Check Meter Reading With Float Up < 5 ohms OK With Float Down Float Up or Down OL Out of Range Required Action OK Check Float Harness Continuity (See next Page)

22 Float Assembly Check To check float harness... A) Turn power off and unplug float harness from base unit. B) Lift lid/float assembly out of tank and lay across top of tank. C) Move floats to down position. C) Set meter to Ώ. Probe end of float harness, each pin (1, 2 & 3) to pin # 4. When checking each float perform steps D thru F. D) Lift bottom float to closed position. E) Measure at the harness between pin # 4 and the pin of the raised float (# 3). Verify readings are within range. If not replace float assembly. Common Bottom Float Top Float Middle Float 2 : Motor should stop after top float switch is raised. When working on Twin units, unplug parel harness. Float in Down Position Top Float Middle Float Check Meter Reading Required Action With Float in < 5 ohms OK Closed Position With Float in Down OL OK Position Float Up or Down Out of Range Replace Float Harness Float in Closed Position Bottom Float AA2341 Earlier production units had three reed switch floats. The middle float was not used and is not insted in current production units. Midmark Corporation 2010 SF-1943 [Revised: 9/20/11] B-7

23 Check Valve Check Valve Test...B-9 Location & Function The check valve located in the drain ows the separator to drain upon removal of vacuum pressure. When the pump is not running, the valve opens, owing liquids to drain. If the pump is running the valve closes to keep air in the drain from back flushing into the system. When insting check valve in horizontal position, confirm the hinge for the flapper is on top of the valve. Each vacuum pump in a multiple pump instation requires a check valve to be insted into the intake line. This prevents loss of suction pressure when one pump in the system is turned off. If no check valve is present, flow will be owed through the off pump, creating a loss of suction of the rest of the system. Vacuum Pressure Keeps Valve Closed when Pump is Running When Pump Stops Valve Opens for Liquids and Solids to Drain Multiple Units have two additional check Valves located in the Tee Assembly AA2300 Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-8

24 Check Valve Check Valve Function...B-7 Check When working on Twin units, unplug parel harness. Step 3: Turn power off. Step 4: ow unit to drain completely. Equipment Room Operatory On/Off Switch Step 1: Vacuum 1-2 gons of fresh water into system through operatory lines. Step 5: Pull drain hose out of drain. Turn power on and place hand over end of drain hose. : If you feel suction, check valve is stuck, replace check valve. If no suction is felt, check valve is good. Step 2: Turn vacuum off and ensure that water drains from separator. : If water does not drain out, remove lid and see if valve is clogged. Flush and clean tank (Refer to: Section B Separator Tank) to clean valve If not draining replace valve. If water drains out, continue with step 3. Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-9

25 Motor & Pump Location & Function The 3 HP, three phase, 230 volt, electric motor is located on an adjustable motor mount and is easily accessible. There is an automatic belt tensioner within the pulley system. Check Motor (Lock-up)...B-11 Check Motor (Electrical)...B-12 Check Pump...B-13 Pump, Change Gear Lube...B-14 Motor The motor has a resettable thermostat that will open when the motor overheats. It is temperature controlled, so when it gets too hot it will open and when it cools off enough it will close again. Since the thermostat directly controls the state of the motor, there is no warning for when the motor will start or stop. The dry vacuum pump requires no lubricant in the pumping chamber. The pump is a dual rotary claw type and belt-driven by the motor. Rotary Claw Pump warning Motors are thermy protected with automatic reset. Unit may start without warning. Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-10

26 Motor (Lock-up) Check To check motor (lock-up)... A) Turn power off at on/off switch and main power supply box. B) Remove front cover. Refer to Section C access procedures. C) Use belt to check pulley. If locked up try to work loose with belt. D) Remove belt if unable to work loose. E) Verify motor pulley moves freely, if not motor bearing is locked up, replace motor. Motor & Pump Location...B-10 Check Motor (Electrical)...B-12 Check Pump...B-13 Pump, Change Gear Lube...B-14 Section C Access Procedures...C-1 Section D Wire Diagrams...D-1 When working on Twin units, unplug parel harness. Motor Pulley Belt Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-11

27 Motor (Electrical) Check warning Motors are thermy protected with automatic reset. Unit may start without warning. If equipment room is too hot, ow to cool, motor will restart on it s own. +2 A1 A2 +V AC AM AC MP S1 S2 S3 S4 S5 S6 S7 HC SC H1 RP Motor & Pump Location...B-10 Check Motor (Lock-up)...B-11 Check Pump...B-13 Pump, Change Gear Lube...B-14 Section C Access Procedures...C-1 Section D Wire Diagrams...D-1 /L2 T/L3 B1 B2 U/T1 V/T2 W/T3 When working on Twin units, unplug parel harness. Disconnect and Check Ground Stud To check motor... A) Turn power off at on/off switch and main power supply box. B) Remove electrical cover. C) Remove VFD covers. D) Set meter to Ώ. E) Disconnect wires from U/T1 (Black), V/T2 (Red) and W/T3 (Blue). F) Check wire connections, Black to Red, Black to Blue and Red to Blue. G) Check ground connections, Black to Ground, Red to Ground and Blue to Ground. Checks Check Each to Ground : Refer to: Section D for Wire Diagrams and Section C for Access Procedures for Electrical Cover and VFD box. If checks are out of range and if Probable Causes for motor not running (see Sec A - Troubleshooting Chart) have been checked and the motor still doesn t run, replace motor. Midmark Corporation 2010 SF-1943 [Revised: 5/1/13] B-12 Check Wire Connections Ground Connections Meter Reading 1.2 +/-.3 ohms OL Required Action Motor - OK Motor - OK

28 Pump Check Step 1: Turn power off at on/off switch and main power supply box. When working on Twin units, unplug parel harness. Motor & Pump Location...B-10 Check Motor (Lock-up)...B-11 Pump, Change Gear Lube...B-14 Step 2: Check pulley to see if locked up. Use belt to check pulley. Try to work pulley loose, turn with hand. : If pulley does not move, continue with Steps 3, 4 and 5. Step 3: Check gear lubricant level. Add if below 1/3 full. Use only Midmark gear lube P/N : If gear lube has been added two times or more during the past year, c Dealer for service. If gear lube is not light yellow / clear opaque cover, it will need to be changed. Refer to: Section B Pump, Change gear lube. Max Inlet Add Add Gear Lube Here Drain Plug Step 4: To drain pump. Check for water in pump. Remove drain bolt off pump & barb fitting at the bottom of the p-trap to release any water inside. When pump & P-trap is done draining replace drain bolt and the barb fitting. : Water may flood out, set funnel under bolt hole to move water from pump into a bucket or tray. Step 5: After draining you must... Remove inlet hose either at pump or at separator. Pour 2 ounces (1/4 cup) of conditioning fluid ( ) into pump and let soak. (or WD-40 if unavailable.) Try to work pulley loose as fluid migrates through pump. If pump will not free up order Timer/Conditioning Fluid Kit ( ) and socket ( ). If pump rotates freely replace inlet hose, restore power, and start vacuum. Order Timer/Conditioning Fluid Kit if needed. Midmark Corporation 2010 SF-1943 [Revised: 12/15/15] B-13

29 Pump Change Gear Lube Motor & Pump Location...B-10 Check Motor...B-12 Check Pump...B-13 The PowerVac G gear lube should be changed every 10 years. It will hold approximately 2/3 of a quart of Midmark PN which can be ordered in a liter. To change gear lube... A) Run PowerVac G for 5-10 minutes. B) Disconnect main power supply to the PowerVac G. C) Remove front cover. Refer to: Section C Front Cover D) Remove venting valve plug. E) Siphon gear lube out from venting valve hole. F) Fill in new gear lube until the level is slightly above the middle of the site gauge. G) Verify seal ring on vent valve is undamaged. H) Replace vent valve plug and or drain plug. (See ) I) Clean any gear lube that leaked on inside or outside of housing. J) Replace front cover. Connect main power supply and run pump for 5 minutes and recheck the gear lube on the site gauge. Venting Valve Plug Site Gauge : If you do not have a siphon hose, you may access the drain plug located below the site gauge. Place a oil absorbent mat under drain hole and funnel the gear lube out the side access hole in housing into a drain tray. Dispose of gear lube in compliance with applicable regulations. Drain Plug Access Hole in Housing Midmark Corporation 2010 SF-1943 [Revised: 5/1/13] B-14

30 Master Control Panel Location & Function Master Control Panel Test...B-16 Low Voltage Test...B-17 Wiring for remote On/Off switch, Master Control Panel Low voltage (24 VAC) wiring provides power for a remote On/Off switch and indicator light (optional). It is located behind the rear cover on the base unit. Rear of Base Unit Shown Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-15

31 Master Control Panel Testing Step 1: Turn power off at on/off switch and main power supply. Remove electrical cover. Turn power on at on/off switch and main power supply Check to see if D4 LED light is on. If light is on, master control panel is ok. If light is off, continue with step 2. : Refer to Section C Electrical Cover Master Control Panel Function...B-15 Low Voltage Test...B-17 Step 2: Disconnect power at on/off switch and main power supply box. Disconnect Bypass Caution When testing components with power on use care to prevent electrical shock. Air Vac Water When working on Twin units, unplug parel harness. Step 3: Bypass the remote switch to verify it is not defective. Disconnect the red and blue wires from the remote switch. Connect the blue and red wires together. Step 4: Connect power to the PowerVac G. Restore power. : If the hour meter and pump start running then replace the master control panel. Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-16

32 ON 1 2 CTS 3 ON 1 2 CTS 3 Low Voltage Testing When working on Twin units, unplug parel harness. Caution When testing components with power on use care to prevent electrical shock. Master Control Panel Function...B-15 Master Control Panel Test...B-16 Section C Access Procedures...C-1 Step 1: Turn power off at on/off switch and main power supply box. Remove electrical cover. Turn power on. : Refer to Section C Electrical Cover Display / Keypad J12 PWR / Door SW Hour Meter J2 24 VAC PWR R41 R36 R35 C25 C26 D11 C4 ISO_PWR R39 D1 L7 C17 U1 R44 C27 L6 U8 U9 6 PWR/Door SW On D4 R4 D3 L12 R25 R22 C15 C18 R20 R21 C21 System Monitor U5 R43 U4 U6 J7 C19 R3 R18 R19 C22 U3 U2 C20 C3 R24 D7 Top Float K1 K2 K3 K5 K8 K4 K8 K7 C16 D9 R13 D10D8 R10 Middle Float Bottom Float D5 D6 R7 J17 L9 L8 C24 U7 R23 R2C23 D2 YL YL L10 J10 R1 Remote SW J9 MTR-TSTAT R9 R38 R37 R40 C2 R5 C5 U10 U11 Q1 C1 R8 R6 Drive J14 Drive Enable J1 J6 C6 AC PWR On D16 D15 R32 Floats J3 R16 J8 J15 Evac Pump J4 PCB: Date: xx-xx-xx ASSY: Assy Rev BOM: Rev D13 Pressure Sensor J13 J11 Contactor J16 J5 Step 2: Check input voltage as shown on daughter card. Step 3: Check at J2, pin 6 and as shown above on daughter card. AA2332 Drive J14 C15 C19 R2C23 C18 Display / Keypad C24 U7 R23 R1 C17 U1 U2 D2 L10 L7 U4 R44 C27 R20 C20 R3 C16 R38 U3 C3 R37 L6 U5 R40 R5 U8 R21 D11 C5 R25 R18 Remote SW C4 R24 ISO_PWR D7 D9 R13 J9 J12 U10 R19 U9 Top Float C21 R8 L12 U6 D10D8 R10 J6 Q1 PWR / Door SW System Monitor J7 Middle Float U11 C1 Hour Meter MTR-TSTAT R7 Bottom Float YL YL R9 R6 D5 D6 J10 Drive Enable PWR/Door SW On C2 D4 R4 K1 K2 K3 K5 K8 K4 K8 K7 D3 J2 24 VAC PWR J3 C25 C26 R41 R36 R35 R39 D1 AC PWR On D16 D15 R32 R22 R43 C22 J17 L9 L8 J1 R16 Floats C6 : This tests for low voltage across K1 relay. If the voltage is too low, the relay may not energize. Check Meter Reading Required Action Daughter Card (Step 2) 24 VAC +4 / -2 Actual transformer voltage. : if out of range check contactor and transformer. Daughter Card J8 PCB: Date: xx-xx-xx ASSY: Assy Rev BOM: Rev D13 J15 Evac Pump Pressure Sensor J13 J4 J11 Contactor J16 J5 J3 & J2 (Step 3) > 18.5 VAC If less than 18.5 VAC, there may be too much wire between unit and Master control Panel. If length can not be changed, reduce gage of wire to 14 gage. Midmark Corporation 2010 SF-1943 [Revised: 11/2/15] B-17

33 VFD (Variable Frequency Drive) Location & Function Testing VFD...B-19 VFD Error Codes...A-6 Using the pressure sensor readings, the VFD controls the motor speed to maintain a pressure as determined by the programmed pressure set points during both the operating and sleep modes. Pressure is set to 12 Hg at the factory. The VFD is located in the electrical box. Always go though Troubleshooting and VFD error code steps in Section A before testing the VFD. Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-18

34 VFD (Variable Frequency Drive) Testing Display / Keypad J12 PWR / Door SW Hour Meter Step 1: Turn power off at on/off switch and main power supply box. Remove electrical box cover. R41 R36 R35 C25 C26 D11 C4 ISO_PWR R39 D1 L7 C17 U1 R44 C27 L6 U8 U9 PWR/Door SW On D4 R4 D3 L12 R25 R22 C15 C18 R20 R21 C21 System Monitor U5 R43 U4 U6 J7 C19 R3 R18 R19 C22 U3 U2 C20 C3 R24 D7 Top Float K1 K2 K3 K5 K8 K4 K8 K7 C16 D9 R13 D10D8 R10 Middle Float Bottom Float D5 D6 R7 J17 L9 L8 C24 U7 R23 R2C23 D2 L10 J10 R1 Remote SW J9 MTR-TSTAT R9 R38 R37 R40 C2 R5 C5 U10 U11 Q1 C1 R8 R6 Drive J14 Drive Enable J6 C6 J6 When working on Twin units, unplug parel harness. Caution When testing components with power on use care to prevent electrical shock. VFD Location...B-18 VFD Error Codes...A-6 Section C Access Electrical Cover...C-1 J2 24 VAC PWR J1 AC PWR On D16 D15 R32 Floats J3 R16 J8 J15 Evac Pump J4 PCB: Date: xx-xx-xx ASSY: Assy Rev BOM: Rev D13 Pressure Sensor J13 J11 Contactor J16 J5 Step 2: Unplug drive harness from PC board J6 connector. Set meter to DC volts. Turn power to unit on. Check Red Probe to Blue Wire and Black Probe to Black Wire. : Verify voltage is 24VDC +4 / -2. If reading is out of range, go to step three. If reading is in range go to step four. Step 3: Unplug drive harness from S1 & SC on VFD box. Set multi-meter to Ώ.. Check continuity in wire harness. Step 4: Equipment Alert Before performing step 4, verify the PC board checks have been completed first. Refer to Sec B, PC board. Remove outside and live wire covers only on VFD box. Refer to Section C for access procedure. Inst jumper from S1 to SC. Turn power on, motor should start. Meter Reading Required Action OL Replace Drive Harness less than 5 ohms Drive Harness OK - go to Step 4 : If motor doesn t start, replace VFD. If it does start you may have missed problem with the harness. You may have an intermittent connection. Midmark Corporation 2010 SF-1943 [Revised: 03/30/16] B-19

35 Line Filter Line Filter Test...B-21 Location & Function The line filter is used to reduce the unintentional emission from the PowerVac G to low levels. It is located in the electrical box. Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-20

36 Line Filter Test Line Filter Location...B-20 Section C...C-1 Step 1: Turn power off at on/off switch and main power supply box. Remove electrical cover. : Refer to: Section C for Electrical Cover Removal When working on Twin units, unplug parel harness. Step 2: Test continuity. Set meter to Ώ. Test L connection from the Line side to the Load side and then both L terminals to ground. Repeat for N connection. Step 3: Inst electrical cover. Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-21 Meter Reading L to L < 5 Ώ Required Action Filter OK N to N < 5 Ώ Filter OK Line L to Ground = OL Load L to Ground = OL Line N to Ground = OL Load N to Ground = OL Filter OK Filter OK Filter OK Filter OK Any other readings shown will require Line Filter Replacement

37 Fuse and Transformer Location & Function The fuse limits electrical current flowing from the contactor to the transformer. It interrupts electrical current in case of an overload condition on the transformer. Only replace with a 1/8 amp, 250 volt, Type T Slo Blo fuse. Fuse Fuse Testing...B-23 Transformer Testing...B-24 The transformer converts the main supply input of 230 Volts AC to 24 Volts AC for the low voltage circuitry. It also comes equipped with an internal non-resettable thermal fuse that opens when the transformer becomes to hot. Transformer Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-22

38 Fuse Test Step 1: Turn power off at on/off switch and main power supply box.. Remove electrical cover. When working on Twin units, unplug parel harness. Fuse and Transformer Location...B-22 Transformer Testing...B-24 Section C...C-1 Refer to: Section C Electrical Cover Step 2: Remove terminal leads. Test continuity. Set meter to Ώ. Place meter probes on both fuse terminals. AA164301i Step 3: Visuy check fuse to see if it is burnt or broken. Meter Reading OL Visuy Burnt or Broken 0 (close to zero) Reading Visuy looks ok Required Action Replace Fuse Fuse - OK Step 4: Inst electrical cover. Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-23

39 C4 ISO_PWR U8 U9 R25 R21 U5 ON 1 C24 2 CTS 3 D2 Transformer Test When working on Twin units, unplug parel harness. Fuse and Transformer Location...B-22 Fuse Testing...B-23 Section C...C-1 Step 1: Turn power off at on/off switch and main power supply box. Remove electrical cover. Turn on power supply at disconnect box. Leave on/off switch OFF. : Refer to: Section C Electrical Cover Step 2: Verify wire connections are secure to transformer. Feel transformer to verify it is not hot. If it is, ow it to cool off. : Transformer has an internal non-resetting overload fuse. If transformer is hot to touch, ow to cool before testing. If it s hot, check ambient operating temp and input / output voltage. Verify ambient room temperature doesn t exceed 104 o Fahrenheit (37 Celsius). Drive J14 C15 C19 R2C23 C18 Display / Keypad U7 R23 R1 C17 U1 U2 L10 L7 U4 R44 C27 R20 C20 R3 C16 R38 U3 C3 R37 L6 R40 R5 D11 C5 R18 R24 Remote SW D7 D9 R13 J9 J12 U10 R19 Top Float C21 R8 L12 U6 D10D8 R10 J6 Q1 System Monitor J7 Middle Float PWR / Door SW U11 C1 Hour Meter MTR-TSTAT R7 YL YL R9 Bottom Float R6 D5 D6 J10 Drive Enable PWR/Door SW On C2 D4 R4 K1 K2 K3 K5 K8 K4 K8 K7 D3 C25 C26 R41 R36 R35 R39 D1 R22 R43 C22 J17 L9 L8 C6 J2 24 VAC PWR J1 AC PWR On D16 D15 R32 Floats J3 R16 J8 J15 J4 PCB: Date: xx-xx-xx ASSY: Assy Rev BOM: Rev D13 Pressure Sensor J13 J11 Contactor J16 J5 AA2315 Step 3: Turn power on. Unplug transformer wire harness from PC board. Set meter to ~ V. Place meter probes in wire harness connector. : Verify reading is 24 volts ( -2 / +4). If out of range, check incoming supply power to unit, 230 VAC +/- 10%. If incoming voltage is ok, replace transformer. If incoming voltage is not, main power supply needs checked by an electrician. Caution When testing components with power on use care to prevent electrical shock. Meter Reading Exceeds 24 Volts - 2 / + 4 Within 24 Volts - 2 / + 4 Required Action Replace Transformer Transformer - OK Step 4: Inst electrical cover. Midmark Corporation 2010 SF-1943 [Revised: 11/2/15] B-24

40 U8 U9 R25 R21 U5 ON 1 C24 2 CTS 3 D2 PC Board and Daughter Card Location & Function PC Board Check...B-26 Daughter Card Check...B-27 The PC Board is located in the electrical box and performs a number of various functions. These include: isolating circuits, main control for the unit, and provides a 24 Volt DC power supply to power the pressure sensor. There are no fuses or other serviceable parts on the PC Board, however there are six LED indicator lights for trouble-shooting. The lights and connectors are labeled on the board. D5 AC PWR ON - Indicates that the unit is getting power. D4 PWR / DOOR ON - Indicates the door limit switch, the power switch, and the Master Control switch is closed. (Does this when the front cover is on.) D1 ISO PWR - Indicates that 5 Volts DC provided by the drive is present at the keypad. D5 BOTTOM FLOAT - Indicates the bottom float switch is closed. D10 MIDDLE FLOAT - Indicates the middle float switch is closed. D7 TOP FLOAT - Indicates the top float switch is closed. Drive J14 C15 C19 R2C23 C18 Display / Keypad U7 R23 R1 C17 U1 U2 L10 L7 U4 R44 C27 R20 C20 R3 C16 R38 U3 C3 R37 L6 R40 R5 D11 C5 R18 R24 Remote SW C4 ISO_PWR D7 D9 R13 J9 J12 U10 R19 Top Float C21 YL L12 U6 D10D8 R10 R8 PWR / Door SW System Monitor J7 Middle Float U11 C1 J6 Q1 Hour Meter MTR-TSTAT R7 YL YL R9 Bottom Float D5 D6 PWR/Door SW On J10 C2 R6 D4 R4 Drive Enable K1 K2 K3 K5 K8 K4 K8 K7 D3 C25 C26 R41 R36 R35 R39 D1 R22 R43 C22 J17 L9 L8 C6 PC Board J2 24 VAC PWR J1 AC PWR On D16 D15 R32 Floats J3 R16 J8 J15 J4 Pressure Sensor J11 Contactor D13 J13 J16 J5 Daughter Card Midmark Corporation 2010 SF-1943 [Revised: 11/2/15] B-25

41 PC Board Check Step 1: Turn power off at on/off switch and main power supply box. The separator tank should have drained when unit was turned off. Verify it is not full. Remove electrical cover. Refer to: Section B Section C Electrical Cover PC Board Location...B-25 Section C...C-1 Caution When testing components with power on use care to prevent electrical shock. C15 C18 Display / Keypad C17 U1 L7 R44 C27 R20 J12 PWR / Door SW Hour Meter C25 C26 D11 C4 ISO_PWR R41 R36 R35 R39 D1 L6 U8 U9 PWR/Door SW On D4 R4 D3 L12 R25 R22 R21 C21 System Monitor U5 R43 U4 U6 J7 C19 R3 R18 R19 C22 U2 C20 U3 C3 R24 Top Float R38 R37 R40 K1 K2 K3 K5 K8 K4 K8 K7 C16 D7 D9 R13 D10 D8 R10 Middle Float R7 Bottom Float D5 D6 J17 L9 L8 C24 U7 R23 R2C23 D2 L10 J10 R1 Remote SW J9 MTR-TSTAT R9 C2 R5 C5 U10 U11 Q1 C1 R8 Drive J14 R6 Drive Enable J6 C6 When working on Twin units, unplug parel harness. J2 24 VAC PWR J1 AC PWR On ON CTS D16 D15 R Floats J3 R16 J8 J15 J4 PCB: Date: xx-xx-xx ASSY: Assy Rev BOM: Rev D13 Pressure Sensor J13 J16 J11 Contactor J5 Step 2: NOTE: Make sure the front cover is insted and the safety switch is engaged. Turn main power supply and on/off switch on. With the vacuum running unplug wire harness from J6 on PC board. Set meter to Ώ. Test resistance at J6 as shown. Ensure the cable going to J14 is connected securely to avoid a false reading. Midmark Corporation 2010 SF-1943 [Revised: 11/2/16] B-26 Meter Reading Required Action < 5 ohms PC Board - OK Check Contactor > 5 ohms Replace PC Board

42 ON 1 2 CTS 3 Daughter Card Check When working on Twin units, unplug parel harness. Step 1: Set meter to VDC. Place probes at J2 Daughter Card connection as shown. Display / Keypad J12 PWR / Door SW Hour Meter C25 C26 D11 C4 ISO_PWR R41 R36 R35 R39 D1 C15 C18 C17 U1 L7 R44 C27 R20 L6 U8 U9 PWR/Door SW On D4 R4 D3 L12 R25 R22 R21 C21 System Monitor U5 R43 U4 U6 J7 C19 R3 C22 R18 R24 R19 U2 C20 U3 C3 Top Float R38 R37 R40 K1 K2 K3 K5 K8 K4 K8 K7 C16 D7 D9 R13 D10 D8 R10 Middle Float R7 Bottom Float D5 D6 J17 L9 L8 C24 U7 R23 R2C23 D2 L10 J10 R1 Remote SW J9 MTR-TSTAT YL YL R9 C2 R5 C5 U10 U11 Q1 C1 R8 R6 Drive J14 Drive Enable J6 C6 J2 24 VAC PWR J1 AC PWR On D16 D15 R32 Floats J3 R16 J8 J15 J4 PCB: Date: xx-xx-xx ASSY: Assy Rev BOM: Rev D13 Pressure Sensor J13 J11 Contactor J16 J5 AA2338 Meter Reading Required Action < 24 VDC Replace Daughter Card 24 VDC -2 / +4 Daughter Card OK Midmark Corporation 2010 SF-1943 [Revised: 11/2/15] B-27

43 Contactor Contactor Testing...B-29 Location & Function When the contactor is energized, it closes and connects the Main input power supply to the line filter. Main input power supply is then applied to the Variable Frequency Drive (VFD) through R/L1 and S/R2 (single phase). Contactor Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-28

44 Contactor Testing Step 1: Turn power off at on/off switch and main power supply box.. Remove electrical cover. Refer to: Section C Electrical Cover Step 3: Check high voltage on contactor. Set meter to ~ V. Place meter probes on front, left side white and black wires. Refer to: Verify reading is volts. When working on Twin units, unplug parel harness. Contactor Location...B-28 Step 2: Turn power on. Set meter to ~ V. Check voltage on PC board at J5 connection. Also verify black plastic shunt is on J16. : Refer to PC board diagram in Section D. Verify reading is 24 VAC. Caution When testing components with power on use care to prevent electrical shock. Step 5: Insert screwdriver to start manuy. : If system starts, replace contactor. Step 4: Check voltage across contactor. Set meter to ~ V. Place meter probes on top brown wire and bottom yellow wire. : Verify reading is 24 volts. AA2360i Step 6: Inst electrical cover. Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-29 Meter Reading 24 Volts (PC Board Check Volts (Left Side Check) 24 Volts (Top & Bottom Check) Required Action Contactor OK Contactor OK Contactor OK

45 Pressure Sensor Pressure Sensor Testing...B-31 Location & Function The Pressure Sensor measures the vacuum pressure inside the separator tank. The variable frequency drive uses the pressure readings to control the speed at which the motor rotates the pump to inherently control the pressure. Pressure Sensor Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-30

46 Pressure Sensor Testing Step 1: Turn power off at on/off switch and main power supply box. Remove rear cover. Unplug pressure sensor harness from base unit. Set multi-meter to Ώ. Place probes, red probe in bottom hole, black probe in top hole. Check resistance in end of harness unplugged. Refer to: Section C for Access procedures. : Need to follow polarity as shown! If not, measurement will be incorrect. Pressure Sensor Location...B-30 Step 2: Remove pressure sensor cover. Disconnect wire harness from pressure sensor. Check continuity on wire harness. When working on Twin units, unplug parel harness. Top Half of Cover Check harness for Continuity Top Top (Black) Check for Resistance Bottom Bottom Half of Cover Flats on Left when Checking Bottom (Red) Midmark Corporation 2010 SF-1943 [Revised: 11/6/16] B-31 Step Meter Reading Required Action Step 1 Sensor Test Step 2 Cable Test 3 meg ohms increasing to 22 meg ohms < 1 ohm Step 2 Pressure Sensor OK (Replace if readings are out of range.) Wire Harness OK (Replace if readings are out of range.)

47 Fans Fan Testing...B-33 Location & Function 230 VAC is supplied to the fans and are controlled by a thermostat. The fans are energized when the thermostat closes at temperatures exceeding 95 F (35 C). When the temperature of the thermostat drops below 77 F (25 C), the thermostat will open, shutting off the fans. Fans Thermostat Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-32

48 Fan Testing When working on Twin units, unplug parel harness. Contactor...B-28 Fan Location...B-32 Section C - Access Procedures...C-1 Section D - Wire Diagrams...D-1 Connector at Base Unit To check fan... A) Turn power off at on/off switch and main power supply box. B) Remove rear panel. C) Set meter to Ώ. D) Unplug outside fan harness from base unit and fans. E) Check continuity in fan harness (outside). F) Unplug inside fan harness from plug on side of electrical box, contactor and thermostat. F) Check continuity in fan harness (inside). Refer to: Section C for Access Procedures & Section D for Wire Diagrams Check Meter Reading Required Action Continuity on Fan Harness (outside electrical box) Continuity on Fan Harness (inside electrical box) < 1 ohm Fan Harness - OK Check Contactor (Base Unit) OL Replace Fan Harness < 1 ohm Fan Harness - OK Check Contactor OL Replace Fan Harness Fan Harness (inside) Fan Harness (outside) Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-33

49 Gauge Location & Function The vacuum gauge has a 1/4 NPT fitting and a range from 0 to -30 IN./Hg. graduated in increment of 0.5 In/ Hg. Recommended range for the system is 10 Hg to 18 Hg. The system is preset at the factory for 12 Hg. Gauge Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] B-34

50 Separator Tank Rinsing Separator Tank Assembly When working on Twin units, unplug parel harness. To rinse separator tank.. A) Turn On / Off switch to Off position. B) Remove pressure gauge from separator lid and temporarily replace with garden hose adapter. C) Attach garden hose (not shown) to garden hose adapter. D) Run water through garden hose for approximately five (5) minutes. E) Turn water off, disconnect hose, remove garden hose adapter and replace with pressure gauge. : Garden hose adapter was supplied as a loose part when this unit was purchased. Garden Hose Adapter Gauge Separator Lid On / Off Switch Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-35

51 Vacuum Adjustment For Models When working on Twin units, unplug parel harness. Adjust Vacuum Level (Only if needed)... : Adjustment can only be made if unit is running and NOT in sleep mode. If unit is in sleep mode, turn unit off and back on before making adjustment. unit will enter back into sleep mode in 60 seconds. Adjust vacuum level ( Hg) by... A) Press the ESC button until V xx shows on the screen. B) Press Enter to enter the vacuum setting. C) Press the right arrow to highlight the number you would like to change (fl ashing number is selected). D) Use up and down arrows to change the fl ashing number. E) Press Enter to confi rm the vacuum setting. F) To get back to displaying the pressure value, press the ESC button until the V xx shows on the screen. G) Press the up or down arrows until you see Mon on the display. Press enter. H) Press up or down to select U8-02, press enter. Pressure value should appear on the display. Vxx xx is a Variable Reading Mon Reading u8-02 Reading AA2326 AA2327 AA2328 Vacuum level range is 6 Hg - 18 Hg. Midmark recommends operation at factory preset of 12 Hg. If reading is low check for leaks or open operatory lines prior to adjustment. Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-36 Vacuum Adjustment

52 VRV Check and Adjust The VRV is located on the intake side of the pump. The VRV is insted as a precaution to keep the tank from over pressurizing past 18 Hg. Adjustment should only be checked/made if the PowerVac G is not going into sleep mode. This could mean the VRV is not working properly. To check and adjust VRV... A) Turn power off at on/off switch and disconnect box. B) Access VRV by removing back cover. Refer to: Section C Access Procedures. C) Unscrew VRV from Tee fitting. D) Adjust the center mounted screw inside the valve. E) Inst VRV and back cover. : Use 1/4 inch nut driver and phillips screwdriver. Each full clockwise turn increases the vacuum level by approximately 2 Hg. VRV is factory set at 18 Hg. If unable to reach 18 Hg pressure setting, replace VRV. When working on Twin units, unplug parel harness. VRV Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] B-37

53 Section C Access Procedures Front Cover...C-2 Top Plate...C-3 Electrical Cover...C-4 Back Cover...C-5 VFD Covers...C-6 Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] C-1

54 Front Cover Removal / Instation When working on Twin units, unplug parel harness. Caution Power must be turned off when removing front cover. The On/Off switch controls only the secondary circuit power. The main power source must be turned off to remove power in the control box. Plastic Cones Front Cover Remove front cover... A) Disconnect power. B) Unfasten front cover by turning two fasteners 1/4 turn, counter clockwise. C) Lift front cover straight up to remove from side panels. Inst front cover... D) Align plastic cones on new front cover to holes in side panels. E) Turn fasteners 1/4 turn clockwise to secure front cover. F) Inst front cover. Fasteners On/Off Switch Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] C-2

55 Top Plate Removal / Instation Caution The On/Off switch controls only the secondary circuit power. The main power source must be turned off to remove power in the control box. When working on Twin units, unplug parel harness. Pressure Sensor Parel Float Cord Remove top plate... A) Disconnect power. B) Remove back cover. (Refer to: Section C - Back Cover) B) Unplug float, pressure sensor and parel cord from base unit. C) Remove separator from vacuum base unit if applicable. D) Remove top plate. E) Reverse steps to inst. Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] C-3

56 Electrical Cover Removal / Instation Caution The On/Off switch controls only the secondary circuit power. The main power source must be turned off to remove power in the control box. When testing components with power on use care to prevent electrical shock. When working on Twin units, unplug parel harness. Remove/inst electrical cover. A) Disconnect power. B) Remove four screws from electrical cover. C) Remove electrical cover. D) Inst electrical cover. Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] C-4

57 Back Cover Removal / Instation When working on Twin units, unplug parel harness. Ground Screw With Washer Caution Power must be disconnected when removing back cover. The On/Off switch controls only the secondary circuit power. The main power source must be turned off to remove power in the control box. Plastic Cones Fasteners Remove back cover... A) Disconnect power. B) Remove ground screw. C) Unfasten back cover by turning two fasteners 1/4 turn, counter clockwise. D) Lift back cover straight up to loosen from side panels. E) Unplug both fans. Inst back cover... E) Align plastic cones on new back cover to holes in side panels. F) Turn fasteners 1/4 turn clockwise to secure back cover. G) Plug in fans and inst back cover. H) Inst ground screw. Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] C-5

58 VFD Covers Removal / Instation When working on Twin units, unplug parel harness. Outside Cover VFD Access... A) Disconnect power. B) Loosen screw and remove outside cover. C) Pull off live wire cover. D) Pull off wire separator cover. E) To inst covers just push back onto VFD box and tighten screw. Live Wire Cover Separator Cover AA2334i Midmark Corporation 2010 SF-1943 [Revised: 2/17/11] C-6

59 Section D Wiring Diagrams PowerVac G...D-2 Variable Frequency Drive...D-5 Motor Connections...D-6 PCB...D-7 Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] D-1

60 J1 U9 R22 U8 U5 RD BL BL BL BK BK RD BK WH YL BL GN/YL RD BK GN/YL WH BK WH OR BK BK GY GY BR YL J5 D13 J16 J13 Pressure Sensor J11 Contactor J8 J15 Evac Pump J4 R16 J3 Floats D16 D15 R32 AC PWR On 24 VAC PWR K1 K2 K3 K5 K8 K4 K8 K7 Drive Enable J10 R6 Bottom Float D5 D6 J17 PWR / Door SW Hour Meter R7 System Monitor J7 R41 R36 R35 R39 D1 L12 U6 D10 D8 R10 Middle Float U11 C1 Q1 R8 C21 J12 C4 ISO_PWR R18 R24 D7 R19 Top Float D9 R13 Remote SW J9 U10 YL D11 R21 R25 C25 C26 C22 R5 C5 J2 D3 PWR/Door SW On D4 R4 C2 MTR-TSTAT R9 J6 C6 L6 U3 R3 U2 C20 C3 R38 R37 R40 C17 U1 L7 R44 C27 R20 C16 U4 R43 U7 R23 D2 L10 Display / Keypad C24 R1 C15 C18 C19 L9 L8 R2C23 Drive J14 YL BL GY YL BK WH RD BL BK WH BL GN RD RD BK BK BK BK V to V Midmark Corporation 2010 SF-1943 [Revised: 3/1/16] D-2 Electrical Diagram

61 J1 U9 R22 U8 U5 RD BL BL BL BK BK RD BK WH YL BL GN/YL RD BK GN/YL WH BK WH OR BK BK GY GY BR YL J5 D13 J16 J13 Pressure Sensor J11 Contactor J8 J15 Evac Pump J4 R16 J3 Floats D16 D15 R32 AC PWR On 24 VAC PWR K1 K2 K3 K5 K8 K4 K8 K7 Drive Enable J10 R6 Bottom Float D5 D6 J17 PWR / Door SW Hour Meter R7 System Monitor J7 R41 R36 R35 R39 D1 L12 U6 D10D8 R10 Middle Float U11 C1 Q1 R8 C21 J2 D3 PWR/Door SW On D4 R4 C2 MTR-TSTAT J10 R9 J6 MTR-TSTAT J12 C4 ISO_PWR R18 R24 D7 R19 Top Float D9 R13 YL D11 R21 R25 C25 C26 C22 R5 C5 L6 Remote SW J9 Remote SW J9 U10 C6 U3 R3 U2 C20 C3 R38 R37 R40 C17 U1 L7 R44 C27 R20 C16 U4 R43 U7 R23 D2 L10 Display / Keypad C24 R1 C15 C18 C19 L9 L8 R2C23 Drive J14 YL BL GY YL BK WH RD BL BK WH BL GN RD RD BK BK BK BK V to V Midmark Corporation 2010 SF-1943 [Revised: 3/1/16] D-3 Electrical Diagram

62 1 2 3 J1 U9 R22 U8 U5 RD BL BL BL BK BK RD BK WH YL BL GN/YL RD BK GN/YL WH BK WH OR BK BK GY GY BR YL J5 D13 J16 J13 Pressure Sensor J11 Contactor J8 J15 Evac Pump J4 R16 J3 Floats D16 D15 R32 AC PWR On ON CTS 24 VAC PWR K1 K2 K3 K5 K8 K4 K8 K7 Drive Enable J10 R6 Bottom Float D5 D6 J17 PWR / Door SW Hour Meter R7 System Monitor J7 R41 R36 R35 R39 D1 L12 U6 D10D8 R10 Middle Float U11 C1 Q1 R8 C21 J12 C4 ISO_PWR R18 R24 D7 R19 Top Float D9 R13 YL D11 R21 R25 C25 C26 C22 R5 C5 J2 D3 PWR/Door SW On D4 R4 C2 MTR-TSTAT J10 R9 J6 MTR-TSTAT L6 Remote SW J9 Remote SW J9 U10 C6 U3 R3 U2 C20 C3 R38 R37 R40 C17 U1 L7 R44 C27 R20 C16 U4 R43 U7 R23 D2 L10 Display / Keypad C24 R1 C15 C18 C19 L9 L8 R2C23 Drive J14 YL BL GY YL BK WH RD BL BK WH BL GN RD RD BK BK BK BK V W to Present Midmark Corporation 2010 SF-1943 [Revised: 3/1/16] D-4

63 Variable Frequency Drive (VFD) From GND to PC From Drive Enable (PCB) to SC From Drive Enable (PCB) to S1 From Pressure Sensor (PCB) to A2 & AC From Line Filter to R/L1 From Line Filter to S/L2 From Motor to U/T1 From Motor to V/T1 From Motor to W/T1 From Parel Cable To: Blue - A1 Brown - AM White - AC Orange - P1 Green - S6 Yellow - S7 R/L1 S/L2 T/L3 B1 B2 U/T1 V/T2 W/T S1 S2 S3 S4 S5 S6 S7 HC SC H1 RP P1 P2 PC A1 A2 +V AC AM AC MP R+ R- S+ S- -G Jumper P2 to S2 To Drive (PCB) Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] D-5

64 Motor Connections Example U T1 T7 Motor Harness To Controller U (Black) V (Red) W (Blue) Motor Wires T1 / T7 (Yellow) T2 / T8 (Yellow) T3 / T9 (Yellow) --- T4 / T5 / R6 (Yellow) 1 Yellow 1 Red 1 Yellow 1 Red Motor Harness TO PCB, J10 TO PCB, J10 Motor Thermostat Connection Motor Harness AA2333 Midmark Corporation 2010 SF-1943 [Revised: 3/11/2011] D-6

65 BL Door SW RD Hour Meter BL On / Off SW BK 24 VAC PWR BL Display / Keypad J12 PWR / Door SW Hour Meter J2 24 VAC PWR C25 C26 D11 C17 U1 L7 R44 C27 C4 ISO_PWR R41 R36 R35 R39 D1 L6 U8 U9 PWR/Door SW On D4 R4 D3 AC PWR On L12 R25 R22 C15 C18 R20 R21 C21 System Monitor U5 R43 U4 U6 J7 C19 R3 R18 R19 C22 U3 U2 C20 C3 R38 R37 R40 K1 K2 K3 K5 K8 K4 K8 K7 C16 R24 D7 D9 R13 Top Float D10 D8 R10 Middle Float R7 Bottom Float D5 D6 ON J17 CTS L9 L8 C24 U7 R23 R2C23 D2 WH RD BL YL YL L10 J10 R1 Remote SW J9 R9 C2 R5 C5 U10 U11 Q1 C1 R8 Drive J14 R6 Drive Enable J1 J6 C6 GY BK BL BK BK YL D16 D15 R Floats J3 J8 J15 J4 R16 WH GN Plugs into Board J1 D1 C1 V to Present U1 J2 D13 Pressure Sensor GY Midmark Corporation 2010 SF-1943 [Revised: 3/5/15] D-7 J13 J16 J11 Contactor J5 RD BK YL BR Item PC Board Description (sensors & switches not included unless noted) Part Number A Float Harness (Inside) (Float Cord is part of the Float Assembly) B Drive Harness C Contactor Harness D Pareling Harness (Inside Box) Pareling Harness (Between - Master End has 4 pins and Slave End has 6 pins) E Pressure Sensor Wire Harness F 24 VAC Harness G Switch and Hour Meter Harness H Keypad CAT5 Cable I Remote Harness J Motor Thermostat Harness K PC Board L Power Supply Assembly M PVAC Timer N thru P Not Shown or Connected to PCB N Fan Harness (Inside) O Cord, Daisy Chain, Fan (Outside) P 6 ft Electrical Conduit (Base Unit to Disconnect Switch Box

66 Section E Exploded Views & Parts Lists XXX-XXXX-XX XXX-XXXX-XX XXX-XXXX-XX G3, G5, G7 (Single Units)...E-2 G6, G10, G14 (Twin Units)...E-3 Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] E-1

67 PowerVac G G3 G5 G7 Separator Assembly...E-4 Loose Parts...E-6 Vacuum Base Unit...E-9 Loose Parts...E-11 Shipping Bolt Assembly...E-16 Fan Assembly...E-15 Drain Assembly...E-8 Electrical Box...E-12 Electrical Box Covers...E-13 Front Panel Controls...E-14 Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] E-2

68 PowerVac G G6 G10 G14 Twin Tee Assembly...E-7 Vacuum Base Unit...E-9 Loose Parts...E-11 Shipping Bolt Assembly...E-16 Separator Assembly...E-4 Loose Parts...E-6 Fan Assembly...E-15 Drain Assembly...E-8 Front Panel Controls...E-14 Electrical Box...E-12 Electrical Box Covers...E-13 Midmark Corporation 2010 SF-1943 [Revised: mo/dd/yr] E-3

69 Earlier production units had three reed switch floats. The middle float was not used and is not insted in current production units V thru V Single models require one separator assembly. Twin models require two separator assemblies. Separator Item Description Qty. 1 Separator Assembly (includes items 2-7) 1 2 Gasket 1 3 Tank 1 4 Legs 3 5 Screw (1/4 20 x 1/2 TT ) 6 6 Refer to: Drain Assembly Ref 7 Separator Lid Assembly Refer to: Separator Lid Assembly 1 Ref Midmark Corporation 2010 SF-1943 [Revised: 10/1/13] E-4

70 Earlier production units had three reed switch floats. The middle float was not used and is not insted in current production units Beginning Serial Number Label on Separator Tanks V thru Present Single models require one separator assembly. Twin models require two separator assemblies. Midmark Corporation 2010 SF-1943 [Revised: 10/1/13] E-4.1 Separator Item Description Qty. 1 Separator Assembly (includes items 2-7) 1 2 Gasket 1 3 Tank 1 4 Legs 3 5 Screw (1/4 20 x 1/2 TT ) 6 6 Refer to: Drain Assembly Ref 7 Separator Lid Assembly Refer to: Separator Lid Assembly 1 Ref

71 Separator Lid Assembly Item Description Qty. Single models require one separator assembly. Twin models require two separator assemblies Earlier production units had three reed switch floats. The middle float was not used and is not insted in current production units. 1 Float Assembly 1 2 Bulkhead Assembly w/ Bracket 1 4 Separator Lid (not for service) 1 5 Wash Down Fitting Assembly 1 6 Screw ( x TT) 4 7 Pressure Transducer Cover 2 8 Pressure Sensor w/ Harness Harness only ( ) 9 Reducer (1/2 x 1/4 NPT) 2 10 Tee (1/2 NPT) 1 11 Gauge Vac (2 x 1/4 NPT) 1 12 Elbow 90, (1-1/2 NPT) 2 13 Nipple (1 1/2 ) 3 14 Bushing (1-1/2 x 1 ) 1 15 Nipple (1 ) 1 16 Bulkhead Fitting (1 1/2 ) 1 17 Nipple (1/2 ) 1 1 Midmark Corporation 2010 SF-1943 [Revised: 10/6/16 E-5