P66 Series Electronic Fan Speed Controls

Transcription

1 FANs 125, 121 Pressure Controls Section P Product/Technical Bulletin P66 Issue Date 0498 P66 Series Electronic Fan Speed Controls The P66 is a pressure actuated electronic motor speed controller. This control can be used with single phase permanent split capacitor and shaded pole motors that are approved by the motor and equipment manufacturer for speed control applications. By directly sensing pressure, this device electronically varies the speed of a fan motor. Controlling head pressure in the condensing section of a refrigeration system is a common application. Figure 1: P66BAB Fan Speed Control Features and Benefits Exclusive Johnson Controls Pressure Transducer Soft Start /277/480 VAC, 60 Hz Motor Control One or Two Pressure Transducers Two Effective Throttling Ranges (ETR) NEMA 1 or NEMA 3R (Rainproof) Enclosure Built-in Voltage Surge Protection, Radio Frequency Interference (RFI) Suppression, and Grounding Terminal Screw Rapidly responds to changes in air delivery requirements Provides a smooth startup. This significantly reduces motor starting noise and abrupt changes in motor speed, which could occur between zero and full output voltage Universal model can be used on a wide range of voltage applications Useable with single and multi-circuit condensers. The control selects the input with the greatest demand Allows choice of 30 or 60 psi (207 or 414 kpa) ETR Enclosures available for indoor or panel mounting and for outdoor mounting applications Achieves trouble-free operation 1998 Johnson Controls, Inc. 1 Part No , Rev. A Code No. LIT

2 Product Overview The P66 is a pressure actuated electronic motor speed controller. By directly sensing pressure, this device electronically varies the voltage to a fan motor. This control provides direct response to changes in condenser pressure, regardless of the variations in air delivery curves. The P66 can be purchased with one or two pressure sensor inputs. In dual sensor models, the control selects the input with the greatest demand. The P66 is also available with a NEMA 3R (Rainproof) enclosure for outdoor applications. These models come with a plastic enclosure, appropriate gaskets and low voltage wire leads for 24 VAC power connection. Additionally, the critical high voltage components are encapsulated in potting compound. The combination of the above gives the P66 s electronics extra protection in adverse weather conditions. NEMA 1 models cannot be retrofitted in the field to obtain the NEMA 3R (Rainproof) rating. The P66 must be supplied with 24 VAC (1 VA) from an external transformer powered from the same phase as the motor circuit (See wiring diagrams). The low voltage input connections are 1/4 in. quick-connect terminals on the NEMA 1 models and two 6 in. 22 AWG wires on the NEMA 3R models. The line voltage connections are screw terminals. WARNING: Personal Injury Hazard. All Series P66 electronic fan speed controls are designed for use only as operating controls. Where an operating control failure would result in personal injury and/or loss of property, it is the responsibility of the installer to add devices (safety, limit controls) or systems (alarm, supervisory systems) that protect against, or warn of, control failure. WARNING: Personal Injury Hazard. The P66 control is for use only with non-corrosive and nonflammable refrigerants. Use with corrosive or flammable refrigerants may cause equipment damage or personal injury. Typical Application Typical applications include: computer room air conditioning commercial air conditioning commercial refrigeration This control is designed to replace On/Off fan cycling controls, multiple speed motors, condenser floodback systems, temperature fan speed controls, and modulating louver systems. The P66 controls may be used with motors that are approved by the manufacturer for speed control applications and meet the following requirements: Ball-bearing construction Service factor of 1.25 or greater Low heat rise Power factor of 0.7 or greater CAUTION: Equipment Damage Hazard. The P66 may be used only with single phase motors approved by the manufacturer for speed control applications. 2 P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin

3 Dimensions Diameter Mounting Holes for No. 10 Screw Two Spade Terminals for 24 VAC Power Supply Inside Plug (NEMA 1 Enclosure) Valve Depressor 1/4 in. Flare Diameter Capillary 7/16 in. 20 UNF-2B Diameter Conduit Hole (2 places) NEMA 3R Enclosure Two 22 AWG Wire Leads for 24 VAC Power Supply (NEMA 3R Enclosure) Figure 2: P66 and NEMA 3R Enclosure Dimensions, in./mm Figure 3: Adapter Fitting with Depressor P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin 3

4 Operation Overview Condensing unit operation and installation determine the overall capability of maintaining a satisfactory pressure by means of fan speed control. Within the operating range, the P66 provides air delivery in direct proportion to heat rejection requirements. This allows the refrigeration system to perform efficiently in very low ambient temperatures. The P66 s pressure sensor(s) provide direct response to changes in condenser pressure, regardless of the variations in fan delivery curves. The dual pressure input control selects the pressure input with the highest pressure. See the chart below for a typical operational sequence for a P66. 97% 90% Motor Voltage 10% to 40% of Line (model specific) No fan operation in this pressure range. 0 psig Operating Range (i.e., 190/250 psig) Operating Range Plus 20 or 30 psi* Pressure Input 350 psig *20 psi for 30 psi Effective Throttling Range (ETR) 30 psi for 60 psi Effective Throttling Range (ETR) Figure 4: P66 Operation Chart Table 1: P66 Operation Pressure Input Pressure is between 0 psig and the low end of the operating range. Pressure is at the low end of the operating range. Pressure is in the operating range. Pressure is above the operating range. Motor Voltage (VAC, true RMS) 0 to 5 volts Start voltage (10% to 40% of line - model specific) Motor voltage varies directly with system pressure from start voltage to 90% of line voltage. A further pressure increase of 20 to 30 psi will increase motor voltage to 97% of the applied voltage. 4 P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin

5 M ounting Maintaining operating temperatures within the listed product ratings is necessary for reliable operation. The P66 control should be mounted with the cooling fins in a vertical position with no obstruction preventing air flow through the fins. Do not mount the P66 where the control is exposed to excessive heat. For maximum ambient temperature ratings, refer to the Electrical and Temperature Ratings table. For maximum heat dissipation, locate the P66 where fan air passes through the cooling fins. Locate the P66 so the pressure elements inside the base are above the liquid level of the equipment on which the control is being used. Capillary Mounting Guidelines Figure 5: Avoid Sharp Bends Mount the control where it can be conveniently wired to the power supply and the motor. Provide the recommended pressure connection in the high pressure vapor line near the condenser inlet. (A 60 in. capillary is standard.) Provide standard models with a Schrader valve depressor in the female flare fitting. Avoid sharp bends or kinks in the capillary tubing. Purge all tubing and lines before connecting the P66. Coil and secure the excess tubing to avoid vibration. Allow some slack in the capillary to avoid violin string vibration, which can cause the tubing to break. Do not allow the tubing to rub against metal surfaces where friction can damage the capillary. Figure 6: Allow Slack and Coil Excess Capillary CAUTION: Equipment Damage Hazard. The maximum overpressure of the P66 is 450 psig (3103 kpa). Figure 7: Secure the Capillary P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin 5

6 W iring WARNING: Disconnect the power supply before the wiring connections are made to avoid possible electrical shock or damage to the equipment. Make all wiring connections using copper conductors only. All wiring must be in accordance with the National Electrical Code and local regulations. For maximum electrical rating of the control, see the P66 Electrical and Temperature Ratings table. CAUTION: The P66 must be grounded to a suitable earth ground. Figure 8: Permanent split-capacitor motor connections to the P66 Fan Speed Control. Note: The P66 is a single phase control that can only be used with single phase motors. The 24 volt control circuit and the motor must be on the same phase. Figure 9: Permanent Split-Capacitor Motor Connections to the P66 Fan Speed Control 6 P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin Figure 10: Optional Wiring Diagram for Permanent Split-Capacitor Motor Connections to the P66 Fan Speed Control

7 Adjustments The throttling range of the P66 is internally fixed and cannot be adjusted. However, the operating range can be increased or decreased within the controls pressure range. The pressure range is 80 to 200 psig (552 to 1379 kpa) for low pressure models and 140 to 350 psig (965 to 2413 kpa) for high pressure models. The operating range can be adjusted as follows: 1. Locate the adjustment screw on the P66 s pressure transducer. The screw can be accessed through the opening in the upper left-hand corner of the control s base (see Figure 11). (The second transducer, if supplied, is located in the lower righthand corner of the control s base.) 2. Turn the adjustment screw clockwise to increase or counterclockwise to decrease the operating range. Low Pressure Models (80 to 200 psig): 1 turn = approximately ± 17 psig (117 kpa) High Pressure Models (140 to 350 psig): 1 turn = approximately ± 35 psig (241 kpa) Figure 11: Operating Range Adjustment Screw Location Checkout Procedure Before leaving the installation, observe for correct operation. See the Operation Overview section for a typical operational sequence. CAUTION: Equipment Damage Hazard. Any adjustments should be limited to two full turns in either direction. Over-adjustments may prohibit modulation of the motor and/or cause high head pressures. All pressure adjustments should be verified with the use of refrigerant pressure gauges. All other adjustments made other than those described above will effect the operation and performance of the control and void any/all warranties. P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin 7

8 Troubleshooting Refer to the Operation Overview section for proper operation. Table 2: Troubleshooting Chart Problem Possible Cause Possible Solution No fan operation Input pressure is below operating range. No 24 volt control voltage No input pressure to control No problem, normal operation. Check for 24 VAC at control. Alignment. Schrader valve depressor must depress Schrader valve enough to allow pressure into capillary. Fan stops when pressure reaches the high end of the operating range. Bad fan motor Disconnect power. Place a jumper from L 1 to M 1 and connect power. If fan does not start, motor is bad and should be replaced. Pressure transducer problem Control is not wired correctly. See Pressure Transducer Troubleshooting section. See wiring diagrams. No fan modulation (On-Off operation) Fan starts at full speed. Erratic fan operation Fan motor is cycling thermal overload. Control is not wired correctly. Pressure transducer problem Control is not wired correctly. Pressure transducer problem Control is not wired correctly. Dirty or blocked condenser coil Pressure transducer problem Dirty or blocked condenser coil Wrong motor for fan speed control application See wiring diagrams. See Pressure Transducer Troubleshooting. See wiring diagrams. See Pressure Transducer Troubleshooting. Check to see if control voltage (24 VAC) is on same phase as motor. Clean condenser coil. See Pressure Transducer Troubleshooting. Clean condenser coil. Replace with motor approved for fan speed control application. Pressure Transducer Troubleshooting 1. Disconnect 6-pin connector from right side of control. 2. Place a jumper wire between third pin from the top and the bottom pin on the control, not the cable. a. If fan goes to full speed, check for input pressure. b. If there is adequate pressure, the transducer is bad and the control must be replaced. 8 P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin

9 Ordering Information Table 3: Ordering Information Matrix P66 A One Pressure Sensor B Two Pressure Sensors A NEMA 1 B NEMA 3R (Rainproof) B /277/480 volt; 60Hz D /277/480 volt; 50Hz Repairs and Replacement Field repairs must not be made. For a replacement control contact the Original Equipment Manufacturer or your local Johnson Controls/PENN distributor. Table 4: P66 Specific Model Information Part Number Operating Range (psig) Start Voltage (% of line) Capillary Length (in.) P66AAB-1 190/ P66AAB-3 180/ P66AAB-4 135/ P66AAB-6 170/ P66AAB-7 80/ P66AAB-9 170/ P66AAB / P66AAB / P66AAB / P66AAB-13 60/ P66AAB / P66AAB / P66AAD-1* 160/ P66ABB / P66BAB-1 190/ P66BAB-3 170/ P66BAB-4 190/ P66BAB-5 220/ P66BAD-1* 160/ Notes: * 50 Hz + NEMA 3R enclosure P66BAB and P66BAD are dual sensor input models. For further information on model specifications and options, please contact Johnson Controls/PENN Application Engineering at (414) P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin 9

10 Notes 10 P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin

11 Notes P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin 11

12 Specifications Product Low Pressure Control Range Effective Throttling Range High Pressure Control Range Effective Throttling Range Maximum Overpressure Control Voltage Line Voltage Range Start Voltage P66 Electronic Fan Speed Control 80 to 200 psig / 552 to 1379 kpa 30 psi / 207 kpa 140 to 350 psig / 965 to 2413 kpa 60 psi / 414 kpa 450 psig / 3103 kpa 24 VAC, 1VA 187 to 528 VAC 10% to 40% of line (OEM specified - model specific) Electrical Ratings: 208 VAC 240 VAC 277 VAC 480 VAC Full Load Ampere Locked Rotor Ampere Ambient Temperature Maximum 130 F / 54 C 130 F / 54 C 130 F / 54 C 150 F / 66 C Ambient Temperature Minimum -40 F / -40 C -40 F / -40 C -40 F / -40 C -40 F / -40 C Ambient Storage Temperature 40 F / -40 C to 185 F / 85 C Construction Control Case Base and Sensors Plastic Enclosure Enclosure Wiring Connections Low Voltage Line Voltage Pressure Connections Mounting Cold Rolled Steel Cold Rolled Steel UV stabilized polycarbonate with closed cell foam gasket (NEMA 3R models only) NEMA 1 or NEMA 3R (Rainproof) 1/4 in. quick connects (NEMA 1); Two 6 in. 22 AWG Wire Leads (NEMA 3R) Screw Terminals 60 in. / 1524 mm or 120 in. / 3048 mm copper capillary with 1/4 in. / 6 mm flare nut and Schrader valve depressor Vertical only; two holes for No. 10 screws at the top and bottom Agency Listings UL Recognized (U.S.): File SA516, Guide SDFY2 UL Recognized (Canada): File SA516, Guide SDFY8 CSA Certified: Specific models only. Contact Johnson Controls/PENN Application Engineering for specific model information. The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult Johnson Controls/PENN Application Engineering at (414) Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI Printed in U.S.A. 12 P P66 Series Electronic Fan Speed Controls Product/Technical Bulletin