Carrier 19XR, XRV Chillers with Isolation Valves, Push refrigerant into the chiller condenser

TRANSFER REFRIGERANT FROM CHILLER TO PUMP- OUT STORAGE TANK

1. Equalize refrigerant pressure.
a.	Valve positions:
	VALVE	1a	1b	2	3	4	5	6	7	8	10	11	12	13	14
	CONDITION			C		C	C		C	C
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.
	VALVE	1a	1b	2	3	4	5	6	7	8	10	11	12	13	14
	CONDITION			C		C				C
2. Transfer the remaining liquid.
a.	Turn off the pumpout condenser water. Place the
	valves in the following positions:
	VALVE	1a	1b	2	3	4	5	6	7	8	10	11	12	13	14
	CONDITION				C	C				C
b.	Run the pumpout compressor for approximately
	30 minutes; then close valve 10.
	VALVE	1a	1b	2	3	4	5	6	7	8	10	11	12	13	14
	CONDITION				C	C				C	C
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:
	VALVE	1a	1b	2	3	4	5	6	7	8	10	11	12	13	14
	CONDITION			C			C			C	C
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.
	VALVE	1a	1b	2	3	4	5	6	7	8	10	11	12	13	14
	CONDITION	C	C	C	C	C	C	C	C	C	C

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:

VALVE

1a

1b

2

3

4

5

8

11

12

13

14

CONDITION

C

C

C

C

C

C

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.

VALVE

1a

1b

2

3

4

5

8

11

12

13

14

CONDITION

C

C

C

C

C

C

C

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.

VALVE

1a

1b

2

3

4

5

8

11

12

13

14

CONDITION

C

C

C

C

C

C

C

C

C

C

C

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:

VALVE

1a

1b

2

3

4

5

8

11

12

13

14

CONDITION

C

C

C

C

C

C

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.

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