FOR OT/HT MODEL CHILLERS STYLE B AND C CONTROL CENTERS , AND

Transcription

1 LOW PRESSURE CUTOUT CONTROL P/N INSTALLATION AND MAINTENANCE Supersedes: NM4 (1206) Form NM4 (1112) FOR OT/HT MODEL CHILLERS STYLE B AND C CONTROL CENTERS , AND LD12524a Issue Date: November 12, 2012

2 IMPORTANT! READ BEFORE PROCEEDING! GENERAL SAFETY GUIDELINES FORM NM4 This equipment is a relatively complicated apparatus. During installation, operation maintenance or service, individuals may be exposed to certain components or conditions including, but not limited to: refrigerants, materials under pressure, rotating components, and both high and low voltage. Each of these items has the potential, if misused or handled improperly, to cause bodily injury or death. It is the obligation and responsibility of operating/service personnel to identify and recognize these inherent hazards, protect themselves, and proceed safely in completing their tasks. Failure to comply with any of these requirements could result in serious damage to the equipment and the property in which it is situated, as well as severe personal injury or death to themselves and people at the site. This document is intended for use by owner-authorized operating/service personnel. It is expected that these individuals possess independent training that will enable them to perform their assigned tasks properly and safely. It is essential that, prior to performing any task on this equipment, this individual shall have read and understood this document and any referenced materials. This individual shall also be familiar with and comply with all applicable governmental standards and regulations pertaining to the task in question. SAFETY SYMBOLS The following symbols are used in this document to alert the reader to specific situations: Indicates a possible hazardous situation which will result in death or serious injury if proper care is not taken. Identifies a hazard which could lead to damage to the machine, damage to other equipment and/or environmental pollution if proper care is not taken or instructions and are not followed. Indicates a potentially hazardous situation which will result in possible injuries or damage to equipment if proper care is not taken. Highlights additional information useful to the technician in completing the work being performed properly. External wiring, unless specified as an optional connection in the manufacturer s product line, is not to be connected inside the control cabinet. Devices such as relays, switches, transducers and controls and any external wiring must not be installed inside the micro panel. All wiring must be in accordance with Johnson Controls published specifications and must be performed only by a qualified electrician. Johnson Controls will NOT be responsible for damage/problems resulting from improper connections to the controls or application of improper control signals. Failure to follow this warning will void the manufacturer s warranty and cause serious damage to property or personal injury. 2 JOHNSON CONTROLS

3 CHANGEABILITY OF THIS DOCUMENT In complying with Johnson Controls policy for continuous product improvement, the information contained in this document is subject to change without notice. Johnson Controls makes no commitment to update or provide current information automatically to the manual owner. Updated manuals, if applicable, can be obtained by contacting the nearest Johnson Controls Service office. Operating/service personnel maintain responsibility for the applicability of these documents to the equipment. If there is any question regarding the applicability of these documents, the technician should verify whether the equipment has been modified and if current literature is available from the owner of the equipment prior to performing any work on the chiller. CHANGE BARS Revisions made to this document are indicated with a line along the left or right hand column in the area the revision was made. These revisions are to technical information and any other changes in spelling, grammar or formatting are not included. ASSOCIATED LITERATURE MANUAL DESCRIPTION Operation and Maintenance Manuals OT/HT Style B and C TURBOPAK Chillers Electronic Control Center Part No Electronic Control Center Part No Wiring Diagrams OT/HT Style B and C TURBOPAK Chillers Electronic Control Center Part No Electronic Control Center Part No Electronic Control Center Part No Electronic Control Center Part No Electronic Control Center Part No Renewal Parts OT/HT Style B and C TURBOPAK Chillers Electronic and Pneumatic Control Centers FORM NUMBER NM NM W W W W W RP1.5 JOHNSON CONTROLS 3

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5 TABLE OF CONTENTS SECTION 1 - GENERAL...7 Application...7 Operation...7 SECTION 2 - INSTALLATION...9 Tools Needed...9 Secure Chiller From Operation...9 Remove Pre-Existing LPCO Control...9 Mounting LPCO Control...9 Pressure Connection Piping...10 Wiring SECTION 3 - TESTING AND ADJUSTMENTS...13 Tools Needed...13 Secure Chiller From Operation...13 Connect LPCO Pressure Connection To A Calibrated Vacuum Source...13 Cutout Setpoint Testing And Calibration...14 Switch Deadband Testing And Calibration...14 Reconnect LPCO Evaporator Pressure Connection And Wiring...15 Return Chiller To Service...15 SECTION 4 - PRODUCT SPECIFICATIONS...17 JOHNSON CONTROLS 5

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7 SECTION 1 - GENERAL 1 Before installing, the installation and maintenance instructions provided with unit must be read and understood. Before installing, verify the control part no. matches the refrigerant duty application. For all applications, a factory set safety control should be tested before use. To avoid damaging control, proof pressure and maximum temperature limits stated in literature and on nameplates must never be exceeded, even by surges in the system. Operation of the unit up to maximum pressure or temperature is acceptable on a limited basis (e.g., start-up, testing) but continuous operation must be restricted to the designated adjustable range. Excessive cycling at maximum pressure or temperature limits could reduce sensor life. Vacuum switches are negative gauge pressure controls that operate at a predetermined constant pressure below atmospheric. This means that the absolute pressure of the cutout setting will vary with local atmospheric pressure changes. Vacuum switches require settings verification at installation and require recalibration if installed elevation is 300 feet or more above or below sea level. Preventative maintenance and periodic testing is necessary for critical applications where damage could endanger property or personnel. These products do not have any field replaceable parts. APPLICATION Low Pressure Cutout (LPCO) controls set point and deadband settings are factory set for R-11 or R-123 duty application as: P/N DESCRIPTION CONTROL VACUUM SWITCH R-11 LPCO Use with R-11 refrigerant CONTROL VACUUM SWITCH R-123 LPCO Use with R-123 refrigerant LPCO controls are available as retrofit kits, inclusive of installation hardware, for converting from the obsolete LPCO control used in Model OT/HT Style B and C chillers having Electronic Control Centers , , , as: P/N DESCRIPTION KIT, CONTROL LPCO R-11 VACUUM SWITCH Use with R-11 refrigerant KIT, CONTROL LPCO R-123 VACUUM SWITCH Use with R-123 refrigerant OPERATION The Low Pressure cutout (LPCO) controls are actuated by evaporator pressure. The LPCO control operates to stop the chiller compressor operation on the decrease of the evaporator pressure equivalent to a refrigerant temperature of 28 F and permits re-starting, (via the start button) when the evaporator pressure increases equivalent to a refrigerant temperature greater than 40 F. LPCO controls set point and deadband settings are factory set for R-11 or R-123 duty application. The cutout set point and deadband settings are field adjustable as described in section III Testing and Adjustments. LPCO controls are vacuum switches which are negative gauge pressure controls that operate at a predetermined constant pressure below atmospheric. This means that the absolute pressure of the cutout setting will vary with local atmospheric pressure changes. LPCO controls require cutout setpoint and JOHNSON CONTROLS 7

8 Section 1 - General deadband settings verification at installation and require recalibration if installed elevation is 300 feet or more above or below sea level. Refer to Section 3 Testing and Adjustments. CUTOUT ON PRESSURE FALL CUTIN ON PRESURE RISE FORM NM4 LPCO controls are activated when the bellows sensor responds to a pressure change. This response actuates a single-pole double-throw snapaction switch, converting the pressure signal into an electrical signal. At atmospheric pressure the switch contacts are made between the Common and Normally Open terminals and open between the Common and Normally Closed terminals. As the pressure falls below the control CUT- OUT setpoint the switch transfers to be made between the Common and Normally Closed terminals and open between the Common and Normally Open terminals. As the pressure rises above the control CUTIN (CU- TIN equals cutout plus deadband settings) the switch transfers to be made between the Common and Normally Open terminals and open between the Common and Normally Closed terminals. Refer to Figure 1. Figure 1 - SWITCH CONTACTS LD JOHNSON CONTROLS

9 SECTION 2 - INSTALLATION TOOLS NEEDED Power Drill and a #25 or 9/64 in. drill bit Adjustable wrenches; 6 in. and 8 in. Open-end wrenches; 3/4 in., 5/8 in. and 9/16 in. Screwdrivers; Flat Blade and Phillips SECURE CHILLER FROM OPERATION 1. Shut off power source feed to the chiller Electronic Control Center (ECC). 2. Lock-Out, Tag-Out the chiller. 3. Pull ECC fuses 1FU, 2FU and 3FU to ensure the LPCO control wiring is deenergized. 4. Close the evaporator service valve having gauge piping going to the Cooler (evaporator) panel gauge and LPCO control. REMOVE PRE-EXISTING LPCO CONTROL 1. Disconnect LPCO control pressure (¼ in. flare nut) connection from the pressure tap behind the Cooler (evaporator) panel gauge. 2. Using a voltage meter, reverify the ECC supply power and to the LPCO control wiring is deenergized. 3. Disconnect the three wires (47, 48 and 49) from the LPCO control and secure out of the way. 4. Remove the two mounting screws and the LPCO control from the ECC. MOUNTING LPCO CONTROL Install unit where shock, vibration and ambient temperature fluctuations will not damage unit or affect operation. Orient unit so that moisture does not enter the enclosure via the electrical connection. When appropriate, this entry point should be sealed to prevent moisture entry. Do not mount unit in ambient temperature exceeding Specified limits. LPCO controls are mounted and operated in a vertical position with the switch up and pressure connection down. The controls are surface mounted using two mounting ears, with holes for #10 screws, on either side of the control bracket plate. 1. Remove enclosure cover first by removing one captive screw located on the front of the cover. 2. When replacing a former LPCO control: a. Select a vertical surface mounting location on the back wall of the ECC for the replacement LPCO control in the same general area of the former control. Ensure that the mounting location allows connection to the preexisting wiring to the control switch terminals and for the new capillary tubing to the Cooler (evaporator) panel gauge pressure tap. b. To reach the LPCO control switch terminals, the preexisting wires (47, 48 and 49) may need to be relocated through the cabinet middle conduit fitting containing the high pressure control wires. c. Using the LPCO control bracket plate as a guide, locate and mark the two mounting holes locations on the ECC back wall. Ensure that the mounting holes locations will not interfere with anything within or outside of the ECC panel. d. Using a power drill and a #25 or 9/64 in. drill bit, drill out the two mounting holes. e. Mount the replacement LPCO control to the back wall of the ECC using two #10 self tapping screws (YORK p/n ) provided in kit. 3. When replacing a former LPCO control a. Mount the replacement LPCO control to the back wall of the ECC where the former control was located and using two #10 self tapping screws (YORK p/n ) provided in kit. 2 JOHNSON CONTROLS 9

10 Section 2 - Installation FORM NM4 PRESSURE CONNECTION PIPING Never use the enclosure for leverage to hand tighten the pressure connection. Always use a wrench to tighten the pressure connection to the piping. To avoid damage to control, always hold the wrench on the wrench flats or hex portion of the pressure connection when tightening piping connections. 1. Installing kit supplied 1/4 Ext. Flare X 1/4 Ext. Pipe half union fitting (YORK p/n ) in LPCO control pressure 1/4 in. NPTI connection. Refer to Figure 2. a. Ensure 1/4 in. pipe thread mating surfaces are clean and free of debris or defect. b. Use pipe thread sealant YORK p/n (Grade 554, Red, 10 ml, for refrigerant pipe up to 1/2 dia.) applied to 1/4 in. external pipe threads only. Do not apply to the first 2 threads of fitting. c. Apply tightening torque to the fitting only while holding back on hex portion of the LPCO control pressure connection. Secure fitting to pressure connection tight enough to ensure a leak free seal. 2. Installing kit supplied Capillary Tube (48 in.) YORK p/n a. Ensure 1/4 in. flare mating surfaces are clean and free of debris or defect. b. Connect the 1/4 in. flare nut on 90 deg. end of capillary tube to the 1/4 in. external flare half union fitting at the LPCO control pressure connection. Apply tightening torque to the flare nut only while holding back on fitting. Secure flare nut to fitting tight enough to ensure a leak free seal. c. Route the capillary tubing across to the right hand wall of the ECC and up the right hand wall to the area of the Cooler (evaporator) panel gauge. Coil any excess capillary tubing near the evaporator pressure tap connection. LD12524 Figure 2 - PRESSURE CONTROL LEFT SIDE VIEW 3. Connect the 1/4 in. flare nut on straight end of capillary tube to the 1/4 in. external flare evaporator pressure tap connection, behind the Cooler (evaporator) panel gauge. Apply tightening torque to the flare nut only while holding back on fitting. Secure flare nut to fitting tight enough to ensure a leak free seal. 4. Use kit supplied wire tie-wraps (YORK p/n ) to secure LPCO capillary tubing as needed. 10 JOHNSON CONTROLS

11 Section 2 - Installation WIRING Disconnect all supply circuits before wiring LPCO control. 2 Wire control according to national and local electrical codes. Maximum wire size is #14 awg. The recommended tightening torque for field wiring terminals is 7 to 17 in-lbs. Electrical ratings stated in literature and on nameplates must never be exceeded - overload on a switch can cause failure on the first cycle. A 7/8 in. dia. hole for conduit connection is provided on the left hand side of the bracket plate. Refer to Figures 2 and 3. Keep the wires as short as possible to prevent interference with the plunger or the adjustable differential switch wheel or obstructing enclosure cover closure. A grounding screw (green) is provided on the right hand side at the rear of the switch bracket. Refer to Figure 3. The three switch terminals are clearly labeled COM- MON, NORMALLY OPEN and NORMALLY CLOSED. Refer to Figures 3 and Remove enclosure cover first by removing the one captive screw located on the front of the cover. Refer to Figures 2 and Install kit supplied plastic snap bushing (YORK p/n ) into LPCO control 7/8 in. dia. conduit hole. Refer to Figures 2 and Replacing a former LPCO control. Proceed to step 4 if replacing a LPCO control a. To reach the LPCO control switch terminals, the preexisting wires (47, 48 and 49) may need to be relocated through the cabinet middle conduit fitting containing the high pressure control wires. Reroute LPCO wiring as necessary. LD12523 Figure 3 - PRESSURE CONTROL FRONT VIEW b. The Faston type push-on terminal connectors used with the former LPCO control wiring are to be cut off and replaced with kit supplied crimp-on insulated spring spade (YORK p/n ) terminal connectors. JOHNSON CONTROLS 11

12 Section 2 - Installation FORM NM4 6. Connect the wire numbered 48 to the LPCO control switch terminal labeled as NOR- MALLY CLOSED. Refer to Figures 1, 3 and 4 and ECC Wiring Diagram. 7. Connect the wire numbered 49 to the LPCO control switch terminal labeled as NOR- MALLY OPEN. Refer to Figures 1, 3 and 4 and ECC Wiring Diagram. 8. Use kit supplied wire tie-wraps (YORK p/n ) to bundle and/or secure LPCO control wires numbered 47, 48 and 49 as needed. 9. Reinstall enclosure cover securing with the one captive screw located on the front of the cover Refer to Figures 2 and 3. RETURN CHILLER TO SERVICE Figure 4 - PRESSURE CONTROL LEFT SIDE CUTAWAY LD Route the three LPCO control wires numbered 47, 48 and 49 through the LPCO control conduit bushing. 5. Connect the wire numbered 47 to the LPCO control switch terminal labeled as COM- MON. Refer to Figures 1, 3 and 4 and ECC Wiring Diagram. 1. Reverify that LPCO installation work performed has been done completely and accurately and chiller is ready to return to service. 2. Open the evaporator service valve having gauge piping going to the Cooler (evaporator) panel gauge and LPCO control. 3. Leak check all ECC and LPCO piping connections with ultrasonic leak detector. Correct any leaks found before returning the chiller to service. 4. Replace ECC fuses 1FU, 2FU and 3FU. 5. Remove Lock-Out, Tag-Out from the chiller. 6. Turn on power source feed to the chiller Electronic Control Center (ECC). 12 JOHNSON CONTROLS

13 SECTION 3 - TESTING AND ADJUSTMENTS TOOLS NEEDED Open-end wrenches; 3/4 in., 5/8 in., 9/16 in., 3/16 in. and 1/4 in. Screwdrivers; Flat Blade and Phillips Vacuum source; Controls Pump J/B P/N (500 psi 25 in. Hg. vac.) or equivalent. Digital vacuum gauge; min. 2-digit (0.00) display, capable of reading 1 ATMS to 30 in. Hg vacuum with 1% accuracy or better. Using the sensor housing or bracket to tighten the fitting to the source will result in damage to the switch. For all applications, a factory set unit should be tested before use. Vacuum switches are negative gauge pressure controls that operate at a predetermined constant pressure below atmospheric. This means that the absolute pressure of the cutout setting will vary with local atmospheric pressure changes. Vacuum switches require settings verification at installation and require recalibration if installed elevation is 300 feet or more above or below sea level. Always recheck settings after any adjustments are made. One Atmosphere equals: ABSOLUTE GAUGE psia = 0.00 psig in. Hg. Absolute = 0.00 in. Hg. Vacuum CUTOUT on pressure fall: refer to Table 1 for setpoint. CUTIN on pressure rise: CUTIN equals CUTOUT plus DEADBAND settings. Refer to Table 1 for settings. SECURE CHILLER FROM OPERATION 1. Shut off power source feed to the chiller Electronic Control Center (ECC). 2. Lock-Out, Tag-Out the chiller. 3. Pull ECC fuses 1FU, 2FU and 3FU to ensure the LPCO control wiring is deenergized. 4. Close the evaporator service valve having gauge piping going to the Cooler (evaporator) panel gauge and LPCO control. CONNECT LPCO PRESSURE CONNECTION TO A CALIBRATED VACUUM SOURCE 1. Disconnect the 1/4 in. flare nut on 90 deg. end of capillary tube to the 1/4 in. external flare half union fitting at the LPCO control pressure connection. 2. Using clean 1/4 in. refrigerant hoses, connect a controllable vacuum source in series to a digital vacuum gauge and to the 1/4 in. external flare half union fitting at the LPCO control pressure connection. Apply tightening torque to the hose connection only while holding back on fitting. Secure hose connection to fitting tight enough to ensure a leak free seal. 3 Table 1 - PRESSURE CONTROL SETTINGS YORK PART NO. CUTOUT SET POINT TO OPEN BETWEEN DEADBAND SETTING APPLICATION in. and in. Hg. Vacuum in. and in. Hg. Absolute in. and in. Hg. Vacuum 8.70 in. and 9.00 in. Hg. Absolute 4.00 in. Hg. ± 0.50 Use with R in. Hg. ± 0.50 Use with R-123 JOHNSON CONTROLS 13

14 Section 3 - Testing and Adjustments FORM NM4 CUTOUT SETPOINT TESTING AND CALIBRATION The LPCO CUTOUT setpoint is calibrated first, then the switch DEADBAND is set. CUTOUT on pressure fall: refer to Table 1 for setpoint. 1. Remove enclosure cover first by removing the one captive screw located on the front of the cover Refer to Figures 2 and Disconnect the three wires (47, 48 and 49) from the LPCO switch terminals and secure out of the way. 3. Connect an Ohm meter, to measure continuity, between the LPCO switch Common and Normally Open terminals. At atmospheric pressure the switch contacts are made between the Common and Normally Open terminals and open between the Common and Normally Closed terminals. 4. Using the controlled vacuum source, slowly lower the pressure to the LPCO toward vacuum. Note at what exact vacuum pressure the switch transfers opening between the Common and Normally Open terminals. As the pressure falls below the control CUTOUT setpoint the switch transfers to be made between the Common and Normally Closed terminals and open between the Common and Normally Open terminals. 5. Carefully and slowly, loosen the hose connection at the vacuum source and allow the pressure in the line to the LPCO slowly rise to atmospheric pressure. Retighten the hose connection at the vacuum source. 6. If the CUTOUT setpoint noted in step 4 is below or above the allowable CUTOUT setpoint range called out in Table 1, then make an adjustment to the setpoint screw. The set point adjusting screw, labeled A in Figure 4, is located beneath the switch and is turned to adjust the set point. Use a 1/4 inch open-end wrench to keep plunger, labeled B in Figure 4, from turning. Using a 3/16 inch open-end wrench, turn the adjustment screw towards the right (counter-clockwise) to increase set point (towards full vacuum) or towards the left (clockwise) to decrease set point (towards 0 psig). 7. Repeat steps 4, 5, and 6 until the noted CUT OUT setpoint is within the allowable range. 8. Once the CUTOUT set point is verified or calibrated, then proceed to the switch DEADBAND calibration procedure. SWITCH DEADBAND TESTING AND CALIBRATION CUTIN on pressure rise: CUTIN equals CUTOUT plus DEADBAND settings. Refer to Table 1 for settings. 1. Connect an Ohm meter, to measure continuity, between the LPCO switch Common and Normally Open terminals. At atmospheric pressure the switch contacts are made between the Common and Normally Open terminals and open between the Common and Normally Closed terminals. 2. Using the controlled vacuum source, slowly lower the pressure to the LPCO toward vacuum. As the pressure falls below the control CUTOUT setpoint the switch transfers to be made between the Common and Normally Closed terminals and open between the Common and Normally Open terminals. 3. Carefully and slowly, loosen the hose connection at the vacuum source and allow the pressure in the line to the LPCO to rise very slowly toward atmospheric pressure. Note at what exact vacuum pressure the switch transfers, again, closing between the Common and Normally Open terminals. As the pressure rises above the control CUTIN (CU- TIN equals cutout plus deadband settings) the switch transfers to be made between the Common and Normally Open terminals and open between the Common and Normally Closed terminals. Allow the pressure to rise to atmospheric. Retighten the hose connection at the vacuum source. 4. If the CUTIN setting noted in step 3 is below or above the allowable DEADBAND range called out in Table 1, then make an adjustment to the switch DEADBAND setting. To adjust the deadband, turn the adjustment wheel on the underside of the switch, labeled C in Figure 4, using the switch Ground (green) mounting screw as an index. As the letters advance, the deadband widens. Turn the adjustment wheels towards the right (counterclock wise) to decrease deadband (towards letter A ) or towards the left (clockwise) to increase deadband (towards letter F ). 5. Repeat steps 3, 4, and 5 until the noted CUTIN is within the allowable DEADBAND setting range. 14 JOHNSON CONTROLS

15 Section 3 - Testing and Adjustments 6. Once the DEADBAND setting is verified or calibrated, then repeat steps 2 and 3 noting both the CUTOUT setpoint and CUTIN Deadband vacuum settings to ensure they are both within allowable settings ranges. Then proceed to reconnect the LPCO evaporator pressure connection and wiring. Always recheck settings after any adjustments are made. RECONNECT LPCO EVAPORATOR PRESSURE CONNECTION AND WIRING 1. Disconnect 1/4 in. refrigerant hose from the 1/4 in. external flare half union fitting at the LPCO control pressure connection. Remove the controllable vacuum source and digital vacuum gauge assembly. 2. Ensure 1/4 in. flare mating surfaces are clean and free of debris or defect. 3. Reconnect the 1/4 in. flare nut on 90 deg. end of capillary tube to the 1/4 in. external flare half union fitting at the LPCO control pressure connection. Apply tightening torque to the flare nut only while holding back on fitting. Secure flare nut to fitting tight enough to ensure a leak free seal. 4. Disconnect the Ohm meter from the switch Common and Normally Open terminals. 5. Connect the wire numbered 47 to the LPCO control switch terminal labeled as COM- MON. Refer to Figures 1, 3 and 4 and ECC Wiring Diagram. 6. Connect the wire numbered 48 to the LPCO control switch terminal labeled as NOR- MALLY CLOSED. Refer to Figures 1, 3 and 4 and ECC Wiring Diagram. 7. Connect the wire numbered 49 to the LPCO control switch terminal labeled as NOR- MALLY OPEN. Refer to Figures 1, 3 and 4 and ECC Wiring Diagram. 8. Reinstall enclosure cover securing with the one captive screw located on the front of the cover. Refer to Figures 2 and 3. RETURN CHILLER TO SERVICE 1. Reverify that LPCO adjustments piping and wiring work performed has been done completely and accurately and chiller is ready to return to service. 2. Open the evaporator service valve having gauge piping going to the Cooler (evaporator) panel gauge and LPCO control. 3. Leak check all ECC and LPCO piping connections with ultrasonic leak detector. Correct any leaks found before returning the chiller to service. 4. Replace ECC fuses 1FU, 2FU and 3FU. Remove Lock-Out, Tag-Out from the chiller. 5. Turn on power source feed to the chiller Electronic Control Center (ECC). 3 JOHNSON CONTROLS 15

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17 SECTION 4 - PRODUCT SPECIFICATIONS Storage Temperature: -65 to 160 F Ambient Temperature Limits: -40 to 160 F Set Point Repeatability: ±1% of range span (±0.71 in. Hg., ±0.35 psi) Shock: Set point repeats after 15G, 10 ms duration Vibration: Set point repeats after 2.5G, cps Enclosure Classification: NEMA 1 Switch Output: One SPDT switch with adjustable deadband Switch Electrical Connections: (3) #8-32 Screw Terminals Electrical Rating: 15A 125/250/480 VAC resistive Enclosure Material: Lexan cover black finish Enclosure Electrical Connection: 7/8 inch diameter hole Pressure Connection: 1/4 inch NPT (female) nickel-plated brass Wetted Materials: Brass bellows and zinc-plated steel spring Weight: Approx. 1 lb Approvals: UNITED STATES AND CANADA UL Listed, cul Certified Pressure: UL 508, CSA C22.2 No. 14, Files # E42272 EUROPE CE Approved Low Voltage Directive (LVD) (73/23/ED and 93/68/EEC) Compliant to LVD Pressure Equipment Directive (PED) (97/23/EC) Compliant to PED Table 2 - PRESSURE APPLICATION CHART ADJUSTABLE SET POINT RANGE Low End Of Range On Fall; High End Of Range On Rise 30 in. Hg Vac. to 20 Psig DEADBAND OVER RANGE PRESSURE* PROOF PRESSURE** 2.00 to 5.00 in. Hg. 20 psig 25 psig * Over Range Pressure - The Maximum pressure that may be applied continuously without causing damage and maintaining set point repeatability. ** Proof Pressure - The maximum pressure to which a pressure sensor may be occasionally subjected, which causes no permanent damage. The unit may require calibration. JOHNSON CONTROLS 17

18 P.O. Box 1592, York, Pennsylvania USA Subject to change without notice. Printed in USA Copyright by Johnson Controls ALL RIGHTS RESERVED Form NM4 (1112) Issue Date: November 12, 2012 Supersedes: NM4 (1206)