Refrigeration Service Operations
143
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.
Liquid Injection Valve
Removal
1. Recover the refrigerant charge.
2. Unsolder the inlet/outlet lines from the liquid
injection valve.
3. Remove liquid injection valve mounting bolts
and remove the liquid injection valve from the
unit.
Installation
1. Install and bolt the liquid injection valve
assembly in the unit.
2. Solder (95-5 Solder) the inlet liquid line and
the outlet line to the injection valve.
3. Pressurize the refrigeration system and test for
leaks. If no leaks are found, evacuate the
system.
4. Recharge the unit with refrigerant and check
the compressor oil.
5. Test the unit to see that the valve is properly
installed.
Dehydrator (Filter-Drier)
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Disconnect the nuts at the end of the drier.
3. Loosen the mounting hardware and remove
the drier.
Installation
1. Install the new drier and tighten the mounting
screws and nuts. Install new o-rings.
2. Install and tighten the inlet nut to the receiver
tank outlet valve line (inlet end of drier is
labeled “IN”). Hold the drier with a back-up
wrench on the hex behind the flare fitting.
3. Tighten outlet nut on the dehydrator to the
evaporator line.
4. Pressurize the low side and inspect for leaks.
If no leaks are found, evacuate the low side.
5. Open the refrigeration valves and place the
unit in operation.
High Pressure Cutout Switch
Removal
1. Recover the refrigerant charge.
2. Disconnect the wires and remove the high
pressure cutout switch from the discharge
tube.
Installation
1. Apply a refrigerant Loctite to the threads of
the high pressure cutout switch.
2. Install and tighten high pressure cutout switch
and reconnect the wires.
3. Pressurize the refrigeration system and test for
leaks. If no leaks are found, evacuate the
system.
4. Recharge the unit with refrigerant and check
the compressor oil.
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