Thermo King SB-190 30, Manual

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Refrigeration Service Operations (Rev. 12/03)
72
3. Remove the mounting bolts that hold the heat
exchanger on the bulkhead.
4. Disconnect the equalizer line from the suction line.
5. Disconnect the liquid outlet line from the expansion
valve.
6. Note the position of the feeler bulb on the side of the
suction line. Remove the expansion valve feeler bulb
from the suction tube.
7. Unsolder the suction line at the evaporator coil end.
8. Unsolder the remaining outlet suction line and inlet liq-
uid line connections from the condenser side of the
bulkhead. Remove any putty from around the lines
before unsoldering the connections.
9. Slide the heat exchanger assembly out of the evaporator
housing.
Installation
1. Clean the tubes for soldering.
2. Place the heat exchanger assembly in the evaporator
housing and install the mounting hardware loosely.
3. Solder the liquid inlet and the suction outlet line con-
nections on the condenser side of the bulkhead. Seal the
openings through the bulkhead with putty when the
refrigerant lines have cooled off.
4. Solder the suction line connection to the evaporator
coil.
5. Connect the equalizer line to the suction line and the
liquid outlet line to the expansion valve.
6. Pressurize the low side and test for leaks. If no leaks are
found, evacuate the low side.
7. Tighten the heat exchanger mounting hardware
securely.
8. Clean the suction tube to a brightly 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 insulating tape.
9. Replace the upper and lower evaporator access panels.
10. Open the refrigeration valves and place the unit in oper-
ation.
EVAPORATOR COIL
Removal
1. Pump down the low side and equalize the pressure to
slightly positive.
2. Remove the upper and lower rear access panels.
3. Remove the roadside and curbside evaporator access
panel mounting channels.
4. Disconnect the sensors.
5. Remove the feeler bulb from the suction line clamp.
Note the position of the feeler bulb on the suction line.
6. Unsolder the distributor from the expansion valve.
7. Unsolder the hot gas line and the suction line from the
evaporator coil.
8. Remove the mounting bolts, lift and slide the coil from
the housing.
Installation
1. Place the evaporator coil in the evaporator housing and
install the mounting bolts.
2. Solder the hot gas line and suction line connections to
the evaporator coil.
3. Connect the distributor to the expansion valve.
4. Replace and connect the sensors.