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Summary of Contents for McQuay Seasonpak PAB Series
- Page 1 B U L L E T I N N O . IM 115 AUGUST 1967 FORM 206034Y INSTALLATION AND MAINTENANCE DATA MODEL PAB AIR COOLED WATER C H I L L E R 7 - 1 / 2 THRU 60 TONS INC..
- Page 3 McQuay to any other Lability not The decision of McQuay’s service department as to whether a defect...
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Page 4: Installation
LOCATION HANDLING The McQUAY line of air cooled water chillers is de- signed for outdoor application. The chiller unit should be located so that all four sides of the unit have free Care should be taken to avoid rough handling or shock area for inlet air flow. -
Page 11: Electrical Control Center
ELECTRICAL ELECTRICAL CONTROL CENTER crankcase heater power should be turned on before starting the system for a time sufficient for all rcfrig- The adjustable safety controls are separated from the erant in the crankcase to be evaporated. This should starting controls by means of a partition dividing the be a minimum of 4 hours, and preferably over night. -
Page 17: Start-Up Procedure
START-UP PROCEDURE Do not start the SEASONPAK air cooled water chiller Check the compressor oil level. Prior to start-up, the oil level should be visible in the oil sight- until the following steps have been completed. glass. Check all auxiliary components of the installation. Check the main system on-off switch to see that it Open the compressor suction and discharge shut is in the “off’... -
Page 18: Operation
OPERATION brush off, or use vacuum cleaner. During full load operation, check the compressor oil level. It should be near the center of the oil sight E. Make general inspection of entice system for any glass during operation. unusual sound or condition. Check the refrigerant charge frequently at the NORMAL REFRIGERANT CHARGE moisture/liquid indicator. -
Page 19: Start-Up After Extended Shutdown
OPERATION and normal operation. Turn off the water circulating pump. (Water circu- lating pump often is left on the line as an assist against damage by freezing of water, if cooler is L. After the unit has run for several minutes, check not going to be drained). - Page 20 CHECKING CONTROLS compressor at the end of the pumpdown cycle. It All controls are checked and adjusted prior to leaving will open at 35 psig and automatically reset at the factory. However, after the unit has operated satis- approximately 60 psig. The control can be checked factorily for a reasonable length of time, a check of by throwing the individual pumpdown switches to the operation and safety controls can be made as...
- Page 21 CHECKING CONTROLS TO CHANGE THE SET POINT: As the water warms up, the low stage should Loosen the setscrews on the collar below the cut in at approximately 49F, which is the inlet and hex nut (see Fig. 7). outlet temperature with the unit off and the high Turn the hex nut with a wrench to the point stage should operate at 54F return.
- Page 22 CONTROLS CHECK ING VALVE CHECKING AND SETTING bottom of the bellows section as indicated in the diagrams. A piece of insulated wire, 8 to 12 The SEASONTROL head pressure control valves are gauge, is a simple and convenient method to make factory set and checked to maintain a minimum head a gauge.
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Page 24: Chilled Water Piping
WATER PIPING GENERAL nation pressure relief and reducing valve. Piping practices vary considerably. In most cases All chilled water piping should be insulated to prevent the nuisance of water dripping from the codes, local ordinances and established practices govern the selection and installation of piping. lines. -
Page 25: System Components
SYSTEM COMPONENTS FIGURE 1 0 FIGURE 11 VIEW FROM END OF COOLER FS4-3 FLOW SWITCH STRAIGHT PIPE COMPRESSOR are never installed in these control lines. The reciprocating semi-hermetic compressor(s) The compressor is pre-charged with sufficient oil are complete with suction and discharge service for normal operation. -
Page 26: Combination Filter-Drier
SYSTEM COMPONENTS COMBINATION FILTER-DRIER cate a chartreuse or yellow color. It is recommended that the equipment operate for about 12 hours to A. Each refrigerant circuit is furnished with a full allow this system to reach equilibrium before de- flow replaceable core type filter-drier. In the filter- ciding if the system requires a change of drier cores. -
Page 27: Thermostatic Expansion Valve
SYSTEM COMPONENTS THERMOSTATIC EXPANSION VALVE B. The water connection nozzles which enter and leave the shell are on the same side of the unit. The expansion valve performs one specific func- No special attention is required for the cooler tion. It keeps the evaporator supplied with the except that clean, filtered water should be supplied. -
Page 28: Service Information
SERVICE INFORMATION TROUBLE SHOOTING CHART TABLE 9 POSSIBLE CORRECTIVE STEPS POSSIBLE CAUSES PROBLEM C l o s e s w i t c h . a ) M a i n s w i t c h o p e n . Compressor w i l l n o t r u n . - Page 29 SERVICE INFORMATION T‘ABLE 9 (Continued) POSSIBLE CORRECTIVE STEPS PROBLEM POSSIBLE CAUSES C o m p r e s s o r w i II not u n l o a d D e f e c t i v e c a p a c i t y c o n t r o l .
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Page 30: Replacement Parts
REPLACEMENT PARTS When writing to McQUAY for service or replacement of installation of the unit and date of failure, along with an explanation of the malfunctions and a descrip- parts, refer to the model number and serial number of the unit as stamped on the serial plate, attached to the tion of the replacement parts required.
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