6-22
Dehumidify Valve Replacement
Refrigeration Maintenance and Service Operations
CRR-20 & CRR-40, September 1999
Dehumidify Valve (Option) 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 vac-
uum with nitrogen between 10 and 20 kPa, 0.10 and 0.20
bar, 1 and 3 psig.
2.
Remove insulating tape from liquid line.
3.
Disconnect the electrical connections to the dehumidify
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.
Cover liquid lines with insulating tape.
8.
Reconnect the electrical wires to the valve.
9.
Open the liquid line service valve and place the unit in
operation. Check the refrigerant charge and add refriger-
ant as required.
Содержание CRR-20
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