Refrigeration Service Operations (Rev. 04/03)
75
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 out-
let 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. Release a small amount of refrigerant to purge the air
through the drier. Then tighten outlet nut on the dehy-
drator to the evaporator line.
4. Pressurize the system and inspect for leaks. If no leaks
are found, open the refrigeration valves and place the
unit in operation.
EVAPORATOR COIL
Removal
1. Remove the refrigerant charge.
2. Remove the evaporator top panel.
3. Disconnect the expansion valve from the distributor.
Disconnect the air switch hoses.
4. Unsolder the suction line and drain pan hot gas line
from the evaporator coil.
5. Disconnect the electric heaters and high temperature
cutout switch on Model 50 units.
6. Remove the mounting bolts and slide 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 drain pan hot gas line con-
nections to the evaporator coil.
5. Connect the distributor to the expansion valve
assembly.
6. Connect the air switch hoses and install the high tem-
perature cutout switch and electric heaters (Model 50).
7. Pressurize the low side and test for leaks. If no leaks are
found, evacuate the unit.
8. Open the refrigeration valves and place the unit in oper-
ation. Install the refrigerant charge and compressor oil
and add as required.
EXPANSION VALVE ASSEMBLY
Removal
1. Pump down the low side and equalize pressure to
slightly positive.
2. Remove the feeler bulb from the suction line clamp.
Note the position of the feeler bulb on the suction line.
3. Unsolder the equalizer line from the expansion valve.
4. Unsolder the inlet liquid line and the distributor from
the expansion valve.
5. Remove the expansion valve mounting bolt and remove
the expansion valve from the unit.
Installation
1. Install and bolt the expansion valve assembly in the
unit.
2. Solder (95-5 Solder) the inlet liquid line and the distrib-
utor to the expansion valve.
3. Solder (95-5 Solder) the equalizer line to the expansion
valve.
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