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Refrigeration Maintenance and Service Operations
138
KVQ Valve Replacement
If the valve body is damaged, replace the entire
valve.
1. Connect the unit’s main power cable to the
main power source. Switch the refrigeration
unit’s On/Off switch to ON.
2. Close the liquid line service valve and pump
down the low side to 21 kPa, 0.21 bar, 3 psig.
3. Turn the unit On/Off switch to OFF. Then
disconnect the main power cable from the
main power source. Close (front seat) the
discharge service valve.
4. Unplug the heater and thermistor lead wire
harnesses.
5. Unsolder the valve outlet (compressor side)
joint from the suction line. Unsolder the inlet
joint and remove valve.
6. Clean the tubes for soldering. Position the new
valve in position in the suction line.
7. Solder both KVQ valve connections.
8. Pressurize the low side and test for refrigerant
leaks (see “Refrigerant Leak Test Procedure”
in the Refrigeration Maintenance chapter of
this manual).
NOTE: If pressurizing with nitrogen, front
seat the discharge valve to prevent nitrogen
from entering the refrigerant charge.
9. If no leaks are found, evacuate the low side
and recover the leak test gas (see “Refrigerant
Recovery” in the Refrigeration Maintenance
chapter of this manual).
10. Plug the heater and thermistor wire harnesses
into the unit wire harness.
11. Open the discharge valve. Then open the
liquid line service valve.
1.
Actuator Assembly
2.
Threaded Connection
3.
Valve Body
4.
Inlet Tube
5.
Valve Plate
6.
Outlet Tube
7.
Pressure Pin
8.
Bellows Assembly
9.
Pressure Reservoir
10.
Heating Element
11.
Terminal Connections
Figure 47: KVQ Valve
AJA1315
CAUTION: Any time the discharge valve
is front seated, disconnect the unit power
source to prevent accidental compressor
start-up.
CAUTION: Use a heat sink or wrap the
valve with wet rags to prevent damage to
the new valve.
Summary of Contents for CRR-40 119
Page 4: ......
Page 16: ...Safety Precautions 16...
Page 18: ...Service Guide 18...
Page 20: ...Model Features 20...
Page 32: ...Specifications 32...
Page 120: ...MP 3000a Controller 120...
Page 160: ...Wiring and Schematic Diagrams Index 160...
Page 161: ...161 MPC2000 Wiring Schematic...
Page 162: ...162 MPC2000 High Voltage Wiring Diagram...
Page 163: ...163 MPC2000 Low Voltage Wiring Diagram...
Page 164: ...164 MPC2000 WCC Wiring Schematic...