6-20
Receiver Tank Replacement
Refrigeration Maintenance and Service Operations
CRR-20 & CRR-40, September 1999
tion. Operate unit and note suction pressure and container
temperature to see that feeler bulb is properly installed.
Receiver Tank Replacement
Removal
1.
Recover the refrigerant charge from the unit (see
“Refrigerant Recovery” in this chapter).
2.
Unsolder the outlet valve on the liquid outlet line.
3.
Unsolder the liquid line inlet connection.
4.
Loosen the mounting nuts and remove the tank.
5.
Remove the adapter with fusible plug (or relief valve),
service fitting, water fittings (option) and water pressure
switch (option) from the receiver tank for installation in
new tank.
Installation
1.
Install a new tank in the unit and tighten the mounting
bolts.
2.
Solder the inlet line and outlet valve line with high tem-
perature silver solder (30% silver).
NOTE: It is strongly recommended that dry nitro-
gen be used to purge the system during any sol-
der operations (see “Using Pressurized
Nitrogen” in this chapter).
NOTE: If pressurizing with nitrogen, front seat
the discharge valve to prevent nitrogen from
entering the refrigerant charge.
CAUTION: Any time the discharge valve is front
seated, disconnect the unit power source to pre-
vent accidental compressor start-up.
3.
Pressurize the refrigeration system and check for leaks
(see “Refrigerant Leak Test Procedure” in this chapter).
4.
Evacuate the system (see “Evacuation and Cleanup of the
Refrigeration System” in this chapter).
5.
Recharge the unit (see “Refrigerant Charge” in this chapter).
High Pressure Cutout Switch, Condenser
Fan Speed Pressure Switch, or Compressor
Discharge Gas Temperature Sensor
Replacement
Removal
1.
Close the liquid line service valve and pump down the low
side. Open the outlet valve slightly to equalize the pres-
sure between 10 and 20 kPa, 0.10 and 0.20 bar, 1 and 3
psig.
2.
Front seat the discharge service valve.
CAUTION: Any time the discharge valve is front
seated, disconnect the unit power source to pre-
vent accidental compressor start-up.
3.
Purge the high pressure from the compressor head through
the service port on the discharge line.
4.
Disconnect the leads from the wire harness and remove
the switch from the compressor discharge manifold (or
remove the sensor from the compressor head).
Installation
1.
Apply a refrigeration locktite (sealant) to the threads of
the switch (or sensor).
2.
Install and tighten the switch (or sensor). Connect the
leads to the wire harness.
3.
Open discharge service valve slightly to pressurize the
compressor head and tube assembly. Check for leaks (see
“Refrigerant Leak Test Procedure” in this chapter). Front
seat the discharge service valve.
4.
If no leaks are found, recover the leak test gas (see
“Refrigerant Recovery” in this chapter).
5.
Open the liquid line service valve and compressor dis-
charge service valve and place the unit in operation.
Содержание CRR-20
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