Thermo King CRR-40 119, Руководство пользователя

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Refrigeration Maintenance and Service Operations
144
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, service
fitting and water fittings (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 temperature silver solder (30% silver).
NOTE: It is strongly recommended that dry
nitrogen be used to purge the system during
any solder 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.
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
Replacement
Removal
1. Close the liquid line service valve and pump
down the low side. Open the outlet valve
slightly to equalize the pressure between 10
and 20 kPa, 0.10 and 0.20 bar, 1 and 3 psig.
2. Front seat the discharge service valve.
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 discharge service valve and place
the unit in operation.
CAUTION: Any time the discharge valve
is front seated, disconnect the unit power
source to prevent accidental compressor
start-up.
CAUTION: Any time the discharge valve
is front seated, disconnect the unit power
source to prevent accidental compressor
start-up.