McQuay Seasonpak PAB Series, Installation And Maintenance Data

Page 1: ...15 AUGUST 1967 FORM 206034Y INSTALLATION AND MAINTENANCE DATA MODEL PAB AIR COOLED WATER CHILLER 7 1 2 THRU 60 TONS INC 13600 INDUSTRIAL PARK BLVD P O BOX 1551 MINNEAPOLIS MINNESOTA 55440 PHONE 377 97...

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Page 3: ...Lability not strictly in accordan further warranty is h this policy except to the extent that such in writing and signed by an official of Mc Quay for additional consideration n in accordance with an...

Page 4: ...charge for the job requirements see Table 6 Pages 8 and 9 Charge for specific units can be obtained f rom the nameplatc The McQUAY line of air cooled water chillers is de signed for outdoor applicatio...

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Page 11: ...s covering specific rcquircments CRANKCASE HEATERS The compressors are equipped with crankcase heaters Some models have heaters installed externally below the crankcase and others have heaters inserte...

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Page 17: ...Check to see that the water temperature thermo stat is installed in the entering water line The L thermostat well is to be full of heat conducting compound and the bulb must be secured with the retain...

Page 18: ...graph E B Turn pumpdown switches S3 and S4 to auto posi tion Check liquid sight glass ahead of expansion valve for proper refrigerant charge C Observe operation for several minutes noting un usual sou...

Page 19: ...or at the unit an impedance relay is incorporated in the control circuit Basically this type of control is centered around a relay with a high impedance holding coil connected in series with the basic...

Page 20: ...low side of the system and its purpose is to shut down the D E compressor at the end of the pumpdown cycle It will open at 35 psig and automatically reset at approximately 60 psig The control can be c...

Page 21: ...een switches Do NOT make any adjustments other than the dial as this is a preset precision control TO CHANGE THE SET POINT 1 2 3 Loosen the setscrews on the collar below the hex nut see Fig 7 Turn the...

Page 22: ...checked as follows A Make up a depth gauge for inserting through the adjusting nut opening and long enough to hit the CONTROLS B C D E bottom of the bellows section as indicated in the diagrams A piec...

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Page 24: ...t the nuisance of water dripping from the lines If insulation is not of the self contained vapor barrier type it should be covered with a moisture seal Do not insulate piping until it has been tested...

Page 25: ...on chamber on the motor end of the compressor Shut off valves E F G VIEW FROM END OF COOLER STRAIGHT PIPE EE D x D x 1 are never installed in these control lines The compressor is pre charged with suf...

Page 26: ...or of the moisture indicator button is an indication of the dryness of the system and is ex tremely important when the system has been ser v i c e d Immediately after the system h a s been opened for...

Page 27: ...nto heavy duty steel tube sheets and s c a l e d by a cast steel refrigerant head B The water connection nozzles which enter and leave the shell are on the same side of the unit No special attention i...

Page 28: ...e s s d D i s c h a r g e s h u t o f f v a l v e p a r t i a l l y d O p e n v a l v e c l o s e d L o w D i s c h a r g e P r e s s u r e a F a u l t y c o n d e n s e r t e m p e r a t u r e r e g...

Page 29: ...A d j u s t t h e r m a l e x p a n s i o n v a l v e C o m p r e s s o r l o s e s o i l a L o c k o f r e f r i g e r a n t b E x c e s s i v e c o m p r e s s i o n r i n g b l o w b y a C h e c k...

Page 30: ...ng parts refer to the model number and serial number of with an explanation of the malfunctions and a descrip the unit as stamped on the serial plate attached to the tion of the replacement parts requ...