CRR-20 & CRR-40, September 1999
Refrigeration Maintenance and Service Operations
Liquid Line Solenoid Valve Replacement
6-21
Liquid Line Solenoid Valve Replacement
Removal
1.
Close the liquid line service valve and pump down the low
side to -35 kPa, -0.35 bar, 10 in. vacuum. Break the vacu-
um with nitrogen between 10 and 20 kPa, 0.10 and 0.20
bar, 1 and 3 psig.
2.
Turn the unit On-Off switch OFF. Disconnect electrical
connections to liquid line solenoid.
NOTE: In most cases, only the coil requires
replacement. No other repair is possible on the
liquid line solenoid.
3.
Unsolder the liquid line connections from the valve.
4.
Remove the valve from the unit.
Installation
1.
Clean the tubes for soldering.
2.
Place the new valve in position and solder the connec-
tions.
CAUTION: Use a heat sink or wrap the valve with
wet rags to prevent damage to the new valve.
3.
Release a small amount of refrigerant from the receiver
tank to pressurize the liquid line. Check for leaks (see
“Refrigerant Leak Test Procedure” in the Refrigeration
Maintenance chapter of this manual).
4.
If no leaks are found, recover the leak test gas (see
“Refrigerant Recovery” in the Refrigeration Maintenance
chapter of this manual).
5.
Evacuate the low side (see “Evacuation and Cleanup of
the Refrigeration System” in the Refrigeration
Maintenance chapter of this manual).
6.
Reconnect the electrical wires to the valve.
7.
Open the liquid line service valve and place the unit in
operation. Check the refrigerant charge and add refriger-
ant as required.
Liquid Injection Valve Replacement
Removal
1.
Close the liquid line service valve and pump down the low
side to -35 kPa, -0.35 bar, 10 in. vacuum. Break the vacu-
um with nitrogen between 10 and 20 kPa, 0.10 and 0.20
bar, 1 and 3 psig.
2.
Disconnect the unit power source from the unit.
Disconnect the electrical connections to the liquid injec-
tion valve.
NOTE: In most cases, only the coil requires
replacement. No other repair is possible on the
liquid injection valve.
3.
Unsolder the liquid line connections.
4.
Unbolt and remove the valve from the unit.
Installation
1.
Clean the tubes for soldering.
2.
Place the new valve in position.
3.
Solder the liquid line connections.
CAUTION: Use a heat sink or wrap the valve with
wet rags to prevent damage to the new valve.
4.
Pressurize the low side with refrigerant and check for leaks
(see “Refrigerant Leak Test Procedure” in this chapter).
5.
If no leaks are found, recover the leak test gas (see
“Refrigerant Recovery” in this chapter).
6.
Evacuate the low side (see “Evacuation and Cleanup of
the Refrigeration System” in this chapter).
7.
Reconnect the electrical wires to the valve.
8.
Open the liquid line service valve and place the unit in
operation. Check the refrigerant charge and add refriger-
ant as required.
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