Refrigeration Service Operations 11-8
Installation
1. Install and bolt the expansion valve assembly in the unit.
2. Solder (95-5 Solder) the inlet liquid line and the distributor to the expansion valve.
3. Solder (95-5 Solder) the equaliser line to the expansion valve.
4. Clean the suction line to a bright polished condition. Install the feeler bulb clamps and the feeler bulb on the side of the suction
line in its former position. The feeler bulb must make good contact with the suction line or the operation will be faulty. Wrap
with correct insulating material.
NOTE: Do not use oil or grease once the surfaces are clean.
5. Replace Drier
6. Pressurise the low side and test for leaks. If no leaks are found, evacuate the low side.
7. Install evaporator access panels.
8. Open the receiver tank outlet valve. Place the unit in operation.
9. Test the unit to see that the expansion valve is correctly installed.
10. Check refrigerant charge
Evaporator Coil
Removal
1. Pump down the low side and equalise the pressure to 0 psig, (0 bar g).
2. Remove the evaporator access panels.
3. Unsolder the expansion valve from the distributor.
4. Remove thermostat and thermometer sensors.
5. Remove insulating tape and feeler bulb from suction line clamp. Note the position of the feeler bulb on the suction line.
6. Unsolder the suction line and hot gas line from the evaporator coil.
7. Disconnect the electric heaters and high temperature cutout switch (model 50 units).
8. Remove the mounting bolts and remove the coil from the evaporator housing.
Installation
1. Place the evaporator coil in the housing.
2. Install the mounting bolts and tighten.
3. Clean the tubes for soldering.
4. Solder the suction line and hot gas line connections to the evaporator coil.
5. Solder or connect the distributor to the expansion valve assembly.
6. Replace Drier
7. Pressurise the low side and test for leaks. If no leaks are found, evacuate the low side.
8. Clean the suction line to a bright polished condition. Install the feeler bulb clamps and the feeler bulb on the suction line.
Locate the bulb on the side of the suction line in its former position. The feeler bulb must make good contact with the suction
line or the operation will be faulty. Wrap it with correct insulating material.
9. Install thermostat and thermometer sensors. Install the high temperature cutout switch and electric heaters (Model 50 units).
10. Install evaporator access panels.
11. Back seatthe receiver tank outlet valve. Place the unit in operation. Check the refrigerant charge and compressor oil level and
add as required.
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