IM 812 / Page 22 of 28
Every motor-driven refrigeration system operates on the carnot
cycle. A practical understanding of what goes on at the vari-
ous steps in this cycle can be a big help to the troubleshoot-
ing mechanic. Figure 20 illustrates the refrigeration cycle. The
diagram shows what occurs in each component of a hermeti-
Refrigeration Cycle
cally sealed air conditioning system, as used in this equip-
ment. The temperatures shown are typical of what they might
be when the air entering the condenser (outdoor temperature)
is 95
o
F, and the temperature of the conditioned space is 80
o
F.
Figure 20. Refrigeration Cycle
80
o
F Room Air to Evaporator
45
o
F R22 (Liquid and Gas)
to Evaporator
Capillary Restrictor
120
o
F Condenser Air to Outdoors
Condenser
Evaporator
60
o
F Conditioned Air to Room
Hermetic Compressor
70 PSIG and 55
o
F
to Compressor (Gas)
270 PSIG R22 to Condenser
95
o
F Outdoor Air to
Condenser
120
o
F
Liquid R22
Heating/Cooling Chassis and Front Panel
Size 007 .................................................................... 140 Ibs.
Size 009 .................................................................... 140 Ibs.
Size 012 .................................................................... 145 Ibs.
Size 015 .................................................................... 145 Ibs.
Cabinet/Wall Sleeve .................................................. 36 Ibs.
Louvers
Flush-stamped .............................................................. 6 Ibs.
Architectural .................................................................. 8 Ibs.
Subbase
3" (76mm) High Electrical ........................................... 10 Ibs.
4" (102mm) High Electrical ......................................... 10 Ibs.
Electrical Receptacle .................................................... 1 Ib.
Plug Cord Cover ............................................................ 1 Ib.
Power Cord .................................................................... 1 Ib.
Approximate Shipping Weights
