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Electrical Maintenance (Rev. 04/03)
38
Air Switch
5.
If the switch is out of calibration, pressurize the hose
again until the tester indicates 0.9 in. (22.7 mm) H
2
O.
Adjust the screw clockwise or counterclockwise until
the switch closes and the continuity tester indicates a
completed circuit with the gauge reading 0.9 in. (22.7
mm) H
2
O. Release the pressure.
6.
Repeat test procedure several times to be sure the set-
ting is correct.
7.
Remove the test equipment. Install wire on switch ter-
minal and air sensing tubes on air switch. The BLACK
hose from the high pressure or air inlet side of the evap-
orator coil goes on the hose fitting on the side of the air
switch stamped BLACK. The CLEAR hose from the
low pressure or air outlet side of the evaporator coil
goes on the hose fitting on the side of the air switch
stamped CLEAR.
NOTE: Route hoses for continuous slope to avoid conden-
sate traps.
If too much frost continues to accumulate before defrost,
decrease the pressure setting. Turn the adjustment screw
counterclockwise.
If defrost action occurs with too little frost accumulation,
increase the pressure setting. Turn the adjustment screw
clockwise.
Testing Air Switch
HIGH CAPACITY THERMAX
™
HEATING
SYSTEM
The High Capacity TherMax
™
Heating System
The high capacity heating system increases the capacity of
the heat mode by making more refrigerant available for use
in the heat mode. This is accomplished by adding an addi-
tional solenoid (TherMax™ solenoid) to the refrigeration
system which opens during the beginning of the heat mode
to move the liquid refrigerant from the condenser to the
accumulator where it can be used in the heat mode. The
sequence of operation for the improved heating system is
from the cool mode to the heat with refrigerant transfer
mode to the heat mode. The heat mode to cool mode opera-
tion is the same as in the past. The bypass check valve, and
the condenser check valve have been eliminated from the
TherMax™ heating system.
Summary of Contents for 088669
Page 4: ......
Page 8: ......
Page 12: ...Safety Precautions Rev 04 03 iv PUB126...
Page 13: ...Safety Precautions Rev 04 03 v aea105...
Page 14: ......
Page 28: ...Unit Description Rev 04 03 14 Rear View Curbside RD II SR Evaporator aea105...
Page 32: ...Unit Description Rev 04 03 18 Power Receptacle Box RD II SR 50 aea102...
Page 76: ...Refrigeration Maintenance Rev 04 03 62...
Page 77: ...Refrigeration Maintenance Rev 04 03 63...
Page 81: ...Refrigeration Maintenance Rev 04 03 67...
Page 103: ...89 Hilliard Clutch Maintenance Clutch Assembly...
Page 106: ...Hilliard Clutch Maintenance Rev 04 03 92 12 Install retaining ring Clutch Torque Values...
Page 125: ...111 Cool Cycle RD II SR with TherMax Heating...
Page 126: ...112 Condenser Cycle RD II SR with TherMax Heating...
Page 127: ...113 Heat and Defrost Cycle RD II SR with TherMax Heating...
Page 129: ...115...
Page 130: ...116...
Page 131: ...117...
Page 132: ...118...
Page 133: ...119...
Page 134: ...120...
Page 135: ...121...
Page 136: ...122...