Thermo King 914 724, Руководство пользователя

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Refrigeration Service Operations (Rev. 1/99)
60
Assembly
NOTE: Coat all parts with compressor oil before assembly.
1. Place the spring in the valve body.
2. Place a piston in the valve body piston bore with the
piston sealing surface facing out toward the end cap
seat. Holding the spring at the other end of the valve
body, push the piston in and let the spring return the
piston several times to check that the piston moves
freely.
3. Place a new copper sealing washer in the valve body
near the piston. The sharp edge of the copper sealing
washer should face the valve body and the smooth side
should face the end cap.
4. Carefully place the end cap in the valve body to avoid
damaging the piston, copper sealing washer or the
refrigeration lines. Tighten the end cap nut finger tight.
5. Place the other piston in the other valve body piston
bore with the piston sealing surface facing out toward
the end cap seat. Push the piston in and let the spring
return the piston several times to check that the piston
moves freely.
6. Place a new copper sealing washer in the valve body
near the piston. The sharp edge of the copper sealing
washer should face the valve body and the smooth side
should face the end cap.
7. Carefully place the end cap in the valve body to avoid
damaging the piston, copper sealing washer or the
refrigeration lines. Tighten the end cap nut finger tight.
8. Using a 1-3/4 in. (44.5 mm) crows foot or similar tool,
torque the end cap nuts to 80 ft-lb (59 N•m).
NOTE: A crows foot of this size increases the torque
read on the torque wrench by approximately 6%.
Therefore, the reading on the torque wrench should
be 75 ft-lb (55 N•m).
9. Leak check, evacuate and recharge the system. Test the
check valve operation.
Discharge Check Valve Replacement
Removal
1. Remove the refrigerant charge.
2. Disassemble the check valve.
3. Unsolder the lines and remove the check valve.
Installation
1. Clean the tubes for soldering.
2. Place the disassembled check valve in position.
3. Solder the connections. After the valve cools,
reassemble the valve.
4. Pressurize the refrigeration system and test for leaks.
5. If no leaks are found, evacuate the system.
6. Recharge the unit with refrigerant and check
compressor oil.
ACCUMULATOR
Removal
1. Pump down the low side and equalize the pressure to
slightly positive.
2. Unsolder the inlet and outlet refrigerant suction lines
from the accumulator.
3. Unbolt and remove the accumulator from the unit.