Carrier 19XRV Start-Up, Operation And Maintenance Instructions Manual page 76

f. Close valves 1a, 1b, 3, 4, and 6.
VALVE 1a 1b 2
CONDITION C C C
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 and
40. 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
CONDITION
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 liquid line service valves 2 and 5; open
valves 3 and 4.
VALVE 1a 1b
CONDITION
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.
VALVE 1a 1b
CONDITION C
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.
3 4 5 6 7 10
C C C C C C
2 3 4 5
C C
2 3 4 5
C C
2 3 4 5
C C C C C
a. Turn on the chiller water pumps and monitor the
chiller pressure.
11
b. Valve positions:
VALVE
CONDITION
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 liquid line service valves 3 and 4
are closed and valves 2 and 5 are open.
VALVE
CONDITION
11
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.
VALVE
CONDITION
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
11
evacuated.
C
2. Turn on chiller water pumps.
3. Open valves 1a, 1b, and 3.
VALVE
CONDITION
4. Crack open valve 5, gradually increasing pressure in the
evacuated chiller vessel to 35 psig (241 kPa). Feed refrig-
erant slowly to prevent tube freeze-up.
5. Leak test to ensure chiller vessel integrity.
6. Open valve 5 fully.
VALVE
CONDITION
7. Close valves 1a, 1b, 3, and 5.
11
8. Open chiller isolation valve 11 and any other isolation
C
valves, if present.
VALVE
CONDITION
9. Turn off chiller water pumps.
76
1a 1b 2 3 4
C C
1a 1b 2 3 4
C C
1a 1b 2 3 4
C C C C C
1a 1b 2 3 4
C C
1a 1b 2 3 4
C C
1a 1b 2 3 4
C C C C C
5 11
5 11
C
5 11
C C
5 11
C C
5 11
C
5 11
C