Thermo King SB-210, Manual

Page: 127 / 159

Refrigeration Service Operations
127
Hot Gas Solenoid Valve
Removal
1. Recover the refrigerant charge.
2. Disconnect the wires and remove the coil for
the valve.
3. Unsolder the lines and remove the valve.
Installation
1. Clean the tubes for soldering.
2. Remove the coil and place the valve in
position.
3. Solder the inlet and outlet connections. After
the valve cools, install the coil.
4. Pressurize the refrigeration system and test for
leaks.
5. If no leaks are found, evacuate the system.
6. Recharge the unit with proper refrigerant and
check the compressor oil.
Compressor Oil Filter Change
This unit is equipped with a compressor oil filter.
The compressor oil filter should be changed when
the drier is replaced.
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Front seat the discharge and suction service
valves. Recover the remaining refrigerant
from the compressor.
3. Disconnect the oil lines from the compressor
oil filter. Hold the oil filter with back-up
wrench on the hex behind the ORS fitting.
4. Remove the clamp and the compressor oil
filter.
5. Coat the new O-rings with clean compressor
oil and place them in the ORS fittings on the
ends of the new compressor oil filter.
6. Fasten the new compressor oil filter in place
with the clamp.
7. Attach and tighten the oil lines to the
compressor oil filter. Hold the oil filter with a
back-up wrench on the hex behind the ORS
fitting.
8. Evacuate the compressor and filter to a
maximum of 500 microns to remove trapped
air.
9. Open the service valves, operate the system,
and check the compressor oil filter for leaks.
Figure 115: Compressor Oil Filter
Checking Compressor Oil
Pressure
The oil pressure at the oil pressure access port
varies with the suction pressure in the compressor.
Therefore, we need to calculate the “net oil
pressure” to determine the actual compressor oil
pressure. The net oil pressure is the pressure at the
oil pressure access port minus the suction pressure
below the throttling valve. Use the following
procedure to check the compressor oil pressure.
1. Attach a suitable oil pressure gauge to the oil
pressure access port on the compressor oil
filter.
AEA718