Specifications

71
c. Place valves in the following positions:
d. Run the pumpout compressor until the chiller pres-
sure reaches 35 psig (241 kPa); then, shut off the
pumpout compressor. Warm chiller condenser
water will boil off any entrapped liquid refrigerant
and chiller pressure will rise.
e. When chiller pressure rises to 40 psig (276 kPa),
turn on the pumpout compressor until the pressure
again reaches 35 psig (241 kPa), then, turn off the
pumpout compressor. 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 vacuum (41 kPa abso-
lute). This can be done in On or Automatic mode.
f. Close valves 1a, 1b, 3, 4, and 6.
g. Turn off the pumpout condenser water.
4. Establish vacuum for service. To conserve refrigerant,
operate the pumpout compressor as described in Step 3e
until the chiller pressure is reduced to 18 in. Hg
vacuum (41 kPa absolute).
This operation can be done in Automatic or On mode.
In Automatic mode, the compressor will stop automati-
cally at approximately 15 in. Hg vacuum (51 kPa
absolute).
CHILLERS WITH ISOLATION VALVES — The valves re-
ferred to in the following instructions are shown in Fig. 31-33
and 41. 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:
c. Equalize the refrigerant in the chiller cooler and
condenser.
d. Turn off chiller water pumps and pumpout con-
denser 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
condenser vessel, close the cooler refrigerant isola-
tion 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.
b. Turn on pumpout condenser water.
c. Run pumpout compressor until the chiller cooler
vessel pressure reaches 18 in. Hg vacuum (41 kPa
absolute). Monitor pressures on the chiller control
panel and on refrigerant gages.
This operation can be done in Automatic or On
mode. In Automatic mode, the compressor will
stop automatically at approximately 15 in. Hg
vacuum (51 kPa absolute).
d. Close valve 1a.
e. Turn off pumpout compressor.
f. Close valves 1b, 3, and 4.
g. Turn off pumpout condenser water.
h. Turn off chiller water pumps and lock out chiller
compressor.
Transfer All Refrigerant to Chiller Cooler Vessel
1. Push refrigerant into the chiller cooler vessel.
a. Turn on the chiller water pumps and monitor the
chiller pressure.
b. Valve positions:
c. Equalize the refrigerant in the chiller cooler and
condenser.
d. Turn off chiller water pumps and pumpout con-
denser water.
e. Turn on pumpout compressor to push refrigerant
out of the chiller condenser.
f. When all liquid is out of the chiller condenser,
close valve 11 and any other liquid isolation valves
on the chiller.
g. Turn off the pumpout compressor.
2. Evacuate gas from chiller condenser vessel.
a. Turn on chiller water pumps.
b. Make sure that pumpout valves 3 and 4 are closed
and valves 2 and 5 are open.
c. Turn on pumpout condenser water.
d. Run the pumpout compressor until the chiller con-
denser reaches 18 in. Hg vacuum (41 kPa absolute)
in Manual or Automatic mode. Monitor pressure at
the chiller control panel and refrigerant gages.
e. Close valve 1b.
f. Turn off pumpout compressor.
g. Close valves 1a, 2, and 5.
h. Turn off pumpout condenser water.
i. Turn off chiller water pumps and lock out chiller
compressor.
Return Refrigerant to Normal Operating Conditions
1. Be sure that the chiller vessel that was opened has been
evacuated.
2. Turn on chiller water pumps.
3. Open valves 1a, 1b, and 3.
VALVE 1a1b2345671011
CONDITION C C C C
VALVE 1a1b2345671011
CONDITION CCCCCCCCC
VALVE 1a1b234511
CONDITION C C
VALVE 1a1b234511
CONDITION C C C
VALVE 1a1b234511
CONDITION CCCCCCC
VALVE 1a1b234511
CONDITION C C
VALVE 1a1b234511
CONDITION C C C
VALVE 1a1b234511
CONDITION CCCCCCC
VALVE 1a1b234511
CONDITION C C C C