Thermo King SB-190 30, Manual

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Refrigeration Service Operations (Rev. 12/03)
70
BYPASS CHECK VALVE
Removal
1. Pump down the low side and equalize the pressure to
slightly positive.
2. Close the bypass service valve.
3. Unscrew the flare nut from the check valve.
4. Unscrew the check valve from the bypass valve.
CAUTION: The receiver tank outlet tube may
be bent if a back-up wrench is not used on the
fitting.
Installation
1. Coat the fittings on the bypass check valve with com-
pressor oil and install on the service valve fitting.
Tighten it securely, and use a back-up wrench.
2. Install and tighten the bypass flare nut on the check
valve outlet. Hold the check valve with a back-up
wrench on the hex.
3. Pressurize the low side and test for leaks. If no leaks are
found, evacuate the system.
4. Open the bypass service valve and place the unit in
operation.
RECEIVER TANK
Removal
1. Recover the refrigerant charge.
2. Unsolder the inlet, outlet, and bypass check valve lines
from the receiver tank. Use a heat sink on the bypass
check valve.
3. Unsolder and remove the bypass check valve from the
receiver tank. Use a heat sink on the bypass check
valve.
4. Remove the high pressure relief valve from the receiver
tank.
5. Unbolt the mounting brackets and remove the receiver
tank from the unit.
Installation
1. Install the high pressure relief valve in the receiver
tank.
2. Solder the bypass check valve onto the receiver tank.
Use a heat sink on the bypass check valve.
3. Place the receiver tank in the unit and install the mount-
ing bolts and nuts loosely. Position the receiver tank so
that the sight glass is clearly visible through the view-
ing hole in the mounting bracket.
4. Solder the inlet, outlet, and bypass check valve lines to
the receiver tank. Use a heat sink on the bypass check
valve.
5. Tighten the receiver tank mounting hardware securely.
6. Pressurize the refrigeration system and check for leaks.
If no leaks are found, evacuate the system.
7. Recharge the unit with proper refrigerant.
FILTER DRIER
Removal
1. Pump down the refrigeration system and equalize the
pressure to slightly positive.
2. Disconnect the nuts at the ends of the drier.
3. Loosen the mounting hardware and remove the drier.
Installation
1. Place the new O-rings in the ORS fittings on the ends
of the drier.