Thermo King KD-II SR, Manual

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Refrigeration Service Operations (Rev. 04/03)
114
3. Coat the entire assembly with compressor oil and
install the assembly into the check valve seat in the
three-way valve.
CAUTION: The Teflon valve must be inserted
with the flat side against the valve seat to
ensure proper sealing.
4. Screw the check valve stem into the three-way valve
until the snap ring can be installed.
5. Install the snap ring.
6. Unscrew (back seat) the check valve stem against the
snap ring.
NOTE: Valve stem must be back seated during normal
unit operation.
7. Coat sealing area in cap with compressor oil (use same
type of oil that is used in the system), install and tighten
the cap on the three-way valve.
8. Pressurize the refrigeration system and test for leaks. If
no leaks are found, evacuate the system.
9. Recharge the unit.
THREE-WAY VALVE REPAIR
NOTE: The three-way valve can be repaired in the unit if
leakage or damage to the Teflon seals should occur.
Removal
1. Remove the refrigerant charge.
2. Clean the exterior surface of the valve.
3. Remove the 1/4 in. copper line from the three-way
valve to the pilot solenoid.
4. Loosen the four 1/4 in. Allen head screws (DO NOT
REMOVE); use tool #204-424 to break the gasket at
each side of the center section.
CAUTION: Do not force the tool into the brass
or against the bolts.
5. Unsolder the condenser line from the condenser.
6. Remove the 4 bolts from the valve.
7. Remove the top cap and spring.
8. Remove the spring clip. Observe the slot in the spool
shaft and slide piston away from this slot.
9. Remove the piston.
10. Remove the center section and stem assembly.
11. Inspect the following parts for wear and damage:
a. Bottom cap sealing and support areas.
b. Center section, sealing surface.
c. Top cap, sealing and support surface.
The following parts will be discarded:
a. Stem assembly.
b. All gaskets.
c. Teflon seal and O-ring.
12. Remove the screen.
NOTE: The valve body cannot be reconditioned. Seat posi-
tions change and improper sealing will result.
Installation
NOTE: Three-way valve kit No. 156 is used to repair
three-way valves.
After cleaning and inspecting all parts, reassemble the
valve. Clean solder off the condenser line and condenser
head with sandpaper and tubing brush.
1. Install the screen into the bottom cap.
2. Install new stem into the center section.