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Refrigeration Service Operations
124
Compressor
Removal
1. Pump down the compressor and equalize the
pressure to slightly positive (1 to 2 psig
[7 to 14 kPa]).
2. Loosen and remove the belts from the
compressor pulley.
3. Front seat the discharge and suction service
valves. Recover the remaining refrigerant
from the compressor.
4. Unbolt the discharge valve and suction valves
from the compressor.
5. Disconnect the high pressure cutout switch
wires.
6. Remove the compressor mounting bolts.
7. Lift the compressor out of the unit. Keep the
compressor ports covered to prevent dust, dirt,
etc., from falling into the compressor.
NOTE: When the compressor is removed
from the unit, the oil level should be noted,
or the oil removed from the compressor
should be measured so that the same amount
of oil can be added before placing the
replacement compressor in the unit.
Installation
1. Lift the compressor into the unit and install
the mounting bolts.
2. Install the service valves using new gaskets
soaked in refrigeration oil. Connect the high
pressure cutout switch wires.
3. Reconnect the pilot valve and compound
pressure gauge hoses.
4. Pressurize the compressor and test for
refrigerant leaks.
5. If no leaks are found, evacuate the
compressor. Replace the compressor/electric
motor belt and adjust the tension.
6. Back seat the suction and discharge service
valves.
7. Operate the unit at least 30 minutes and then
inspect the oil level in the compressor. Add or
remove oil if necessary.
8. Check the refrigerant charge and add
refrigerant if needed.
Condenser/Radiator Coil
Removal
1. Remove the refrigerant charge by approved
methods.
2. Remove the grille assembly.
3. Drain engine coolant from the expansion tank
and disconnect the coolant hoses from the
condenser/radiator coil.
4. Unsolder the hot gas inlet tube and liquid
refrigerant line connections.
5. Unbolt and remove the condenser/radiator
cap.
Installation
1. Clean the tubes for soldering.
2. Place the coil in the unit and install the
mounting hardware.
3. Solder the inlet line and liquid line refrigerant
connections.
4. Pressurize the refrigeration system and test for
leaks. If no leaks are found, evacuate the
system.
5. Connect the coolant hoses to the radiator and
refill the expansion tank with 50/50 ethylene
glycol/water solution.
6. Recharge the unit with refrigerant and check
the compressor oil.
7. Reinstall the front grille.
Summary of Contents for 914970
Page 3: ...3...
Page 10: ...Table of Contents 10...
Page 40: ...Operating Instructions 40...
Page 82: ...Electronic Controls 82...
Page 92: ...Electrical Maintenance 92...
Page 124: ...Refrigeration Maintenance 124...
Page 140: ...Hilliard Clutch Maintenance 140...
Page 160: ...Refrigeration Diagrams 160...
Page 163: ...Index 163 W wiring 85 wiring diagrams 165...
Page 164: ...Index 164...
Page 166: ...Wiring and Schematic Diagrams Index 166...
Page 167: ...167 Cab Control RD Wiring Diagram...
Page 168: ...168 RD w o Thermostat Cab Control Schematic...
Page 169: ...169 RD Cab Box Wiring Diagram...
Page 170: ...170 RD Cab Control w Thermostat Schematic Diagram...
Page 171: ...171 RD 50 STD 3 Phase Wiring Diagram Page 1 of 2...
Page 172: ...172 RD 50 STD 3 Phase Wiring Diagram Page 2 of 2...
Page 173: ...173 RD 50 STD 3 Phase Schematic Diagram Page 1 of 2...
Page 174: ...174 RD 50 STD 3 Phase Schematic Diagram Page 2 of 2...
Page 175: ...175 RD 30 STD Wiring Diagram Page 1 of 2...
Page 176: ...176 RD 30 STD Wiring Diagram Page 2 of 2...
Page 177: ...177 RD 30 STD Schematic Diagram Page 1 of 2...
Page 178: ...178 RD 30 STD Schematic Diagram Page 2 of 2...
Page 179: ...179 RD 30 C S Wiring Diagram Page 1 of 2...
Page 180: ...180 RD 30 C S Wiring Diagram Page 2 of 2...
Page 181: ...181 RD w CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 182: ...182 RD w CYCLE SENTRY Schematic Diagram Page 2 of 2...
Page 183: ...183 RD 50 C S 3 Phase Wiring Diagram Page 1 of 2...
Page 184: ...184 RD 50 C S 3 Phase Wiring Diagram Page 2 of 2...
Page 185: ...185 RD w CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 186: ...186 RD w CYCLE SENTRY Schematic Diagram Page 2 of 2...