Carrier POSITIVE PRESSURE STORAGE SYSTEM 19XB - Manual (Page 14)

3. Remove any remaining refrigerant.
a. Turn on chiller water pumps.
b. Turn on pumpout condenser water.
c. Place valves in the following positions:
VALVE 1a 1b 2 3 4 5 6 7 8 10 11
CONDITION C C C C C
d. Run the pumpout compressor until the chiller pres-
sure reaches 60 psig (414 kPa), [30 psig (207 kPa)];
then, shut off the pumpout compressor. Warm chiller
condenser water will boil off any entrapped liquid re-
frigerant and chiller pressure will rise.
e. When chiller pressure rises to 70 psig (483 kPa),
[40 psig (276 kPa)]; turn on the pumpout compressor
until the pressure again reaches 60 psig (414 kPa)
[30 psig (207 kPa)]; then, turn off the pumpout com-
pressor. Repeat this process until the chiller pressure
no longer rises; then, turn on the pumpout compressor
and pump out until the chiller pressure reaches
18 in. Hg (41 kPa absolute).
f. Close valves 1a, 1b, 3, 4, and 6.
VALVE 1a 1b 2 3 4 5 6 7 8 10 11
CONDITION C C C C C C C C C C
g. Turn off the pumpout condenser water.
4. Establish vacuum for service. To conserve refrigerant, op-
erate the pumpout compressor as described in Step 3e un-
til the chiller pressure is reduced to 18 in. Hg (41 kPa
absolute).
CHILLERS WITH ISOLATION VALVES — The valves re-
ferred to in the following instructions are shown in Fig. 9
and 11. Valve 7 remains closed.
Transfer All Refrigerant to Chiller Condenser Vessel:
1. Push refrigerant into chiller condenser vessel.
a. Turn on the chiller water pumps and monitor the chiller
pressure.
b. Valve positions:
VALVE 1a 1b 2 3 4 5 8 11
CONDITION C C C
c. Equalize the refrigerant in the chiller cooler and
condenser.
d. Turn off chiller water pumps and pumpout condenser
water supply.
e. Turn on pumpout compressor to push liquid out of the
chiller cooler vessel.
f. When all liquid has been pushed into the chiller con-
denser vessel, close the cooler refrigerant isolation valve
(11).
g. Turn on the chiller water pumps.
h. Turn off the pumpout compressor.
2. Evacuate gas from chiller cooler vessel.
a. Close pumpout valves 2 and 5; open valves 3 and 4.
VALVE 1a 1b 2 3 4 5 8 11
CONDITION C C C C
b. Turn on pumpout condenser water.
c. Run pumpout compressor until the chiller cooler ves-
sel pressure reaches 18 in. Hg vac (41 kPa absolute).
Monitor pressures on the chiller control panel and on
refrigerant gages.
Fig. 11 — Valve Locations for 19XB Pumpout Unit Without Storage Tank
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