Carrier XRV Refrigerator User Manual

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TRANSFER REFRIGERANT FROM CHILLER TO PUMP-

OUT STORAGE TANK

1. Equalize refrigerant pressure.

a. Valve positions:

b. Slowly open valve 5. When the pressures are

equalized, open liquid line valve 7 to allow liquid

refrigerant to drain by gravity into the pumpout

storage tank.

2. Transfer the remaining liquid.

a. Turn off the pumpout condenser water. Place the

valves in the following positions:

b. Run the pumpout compressor for approximately

30 minutes; then close valve 10.

c. Turn off the pumpout compressor.

3. Remove any remaining refrigerant.

a. Turn on the chiller water pumps using the PUMP-

DOWN LOCKOUT screen, accessed from the

CONTROL TEST table. Turn on the pumps manu-

ally, if they are not controlled by the PIC II.

b. Turn on the pumpout condenser water.

c. Place valves in the following positions:

d. Run the pumpout compressor until the chiller pres-

sure reaches 30 psig (207 kPa) for HFC-134a.

Then, shut off the pumpout compressor. Warm

condenser water will boil off any entrapped liquid

refrigerant and the chiller pressure will rise.

e. When the pressure rises to 40 psig (276 kPa) for

HFC-134a, turn on the pumpout compressor until

the pressure again reaches 30 psig (207 kPa), and

then turn off the pumpout compressor. Repeat this

process until the pressure no longer rises. Then,

turn on the pumpout compressor and pump until

the pressure reaches18 in. Hg. (40 kPa absolute).

f. Close valves 1a, 1b, 3, 4, 6, 7, and 10.

g. Turn off the pumpout condenser water and con-

tinue to use the PIC II PUMPDOWN LOCKOUT

screen functions, which lock out the chiller com-

pressor for operation.

4. Establish a vacuum for service.

To conserve refrigerant, operate the pumpout compressor

until the chiller pressure is reduced to 18 in. Hg vac., ref

30 in. bar. (40 kPa abs.) following Step 3e.

Chillers with Isolation Valves

TRANSFER ALL REFRIGERANT TO CHILLER CON-

DENSER VESSEL — For chillers with isolation valves,

refrigerant can be stored in one chiller vessel or the other with-

out the need for an external storage tank.

1. Push refrigerant into the chiller condenser.

a. Valve positions:

b. Using the PIC II controls, turn off the chiller water

pumps and pumpout condenser water. If the chiller

water pumps are not controlled through the PIC II,

turn them off manually.

c. Turn on the pumpout compressor to push the liquid

refrigerant out of the chiller cooler vessel.

d. When all liquid refrigerant has been pushed into

the chiller condenser vessel, close chiller isolation

valve 11.

e. Access the PUMPDOWN LOCKOUT screen on

the PIC II CONTROL TEST table to turn on the

chiller water pumps. If the chiller water pumps

are not controlled by the PIC II, turn them on

manually.

f. Turn off the pumpout compressor.

2. Evacuate the refrigerant gas from chiller cooler vessel.

a. Close pumpout compressor valves 2 and 5, and

open valves 3 and 4.

b. Turn on the pumpout condenser water.

c. Run the pumpout compressor until the chiller

cooler vessel pressure reaches 18 in. Hg vac

(40 kPa abs.). Monitor pressures on the CVC/

ICVC and on refrigerant gages.

d. Close valve 1a.

e. Turn off the pumpout compressor.

f. Close valves 1b, 3, and 4.

g. Turn off the pumpout condenser water.

h. Proceed to the PUMPDOWN/LOCKOUT function

accessed from the CONTROL TEST table to turn

off the chiller water pumps and lock out the chiller

compressor. Turn off the chiller water pumps man-

ually if they are not controlled by the PIC II.

TRANSFER ALL REFRIGERANT TO CHILLER

COOLER VESSEL

1. Push the refrigerant into the chiller cooler vessel.

a. Valve positions:

b. Turn off the chiller water pumps (either through

the PIC II controls or manually, if necessary) and

the pumpout condenser water.

c. Turn on the pumpout compressor to push the

refrigerant out of the chiller condenser.

d. When all liquid refrigerant is out of the chiller con-

denser, close the cooler isolation valve 11.

e. Turn off the pumpout compressor.