Chillers With Storage Tanks; Transfer Refrigerant From - Carrier 19XR User Manual
Hermetic centrifugal liquid chillers 50/60 hz with pic ii controls and hfc-134a
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Also See for 19XR:
- Start-up, operation and maintenance instructions manual (116 pages) ,
- Installation instructions manual (68 pages) ,
- Product data (52 pages)
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LEGEND
C
— Contactor
FU
— Fuse, 3 Amps
HP
— High-Pressure Cutout
OL
— Compressor Overload
T’STAT
— Internal Thermostat
Compressor Terminal
Contactor Terminal
Overload Terminal
Pumpout Unit Terminal
*Bimetal thermal protector imbedded in motor winding.
Fig. 35 — 19XR Pumpout Unit Wiring Schematic
OIL RETURN
LINE
CONNECTION
CONDENSER
REFRIGERANT
WATER
INLET VALVE
CONNECTIONS
Fig. 36 — Optional Pumpout Unit
Chillers with Storage Tanks —
If the chiller has iso-
lation valves, leave them open for the following procedures.
The letter “C” describes a closed valve. See Fig. 17, 18, 29,
and 30.
TRANSFER REFRIGERANT FROM PUMPOUT STOR-
AGE TANK TO CHILLER
1. Equalize refrigerant pressure.
a. Use the PIC II terminate lockout function on the
PUMPDOWN LOCKOUT screen, accessed from
the CONTROL TEST table to turn on the water
pumps and monitor pressures.
If the chilled water and condenser water pumps are not
controlled by the PIC II, these pumps must be started and
stopped manually at the appropriate times during the refrig-
erant transfer procedure.
b. Close pumpout unit valves 2, 4, 5, 8, and 10, and
close chiller charging valve 7; open chiller isola-
tion valves 11, 12, 13, and 14 (if present).
c. Open pumpout unit/storage tank valves 3 and 6,
open chiller valves 1a and 1b.
VALVE
1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
C
C C
C C C
CONDITION
Follow Steps d and e carefully to prevent damage from
freeze-up.
d. Slowly open valve 5 to increase chiller pressure to
68 psig 35 psig (141 kPa) for HFC-134a. Feed
refrigerant slowly to prevent freeze up.
e. Open valve 5 fully after the pressure rises above
the freeze point of the refrigerant. Open liquid line
valves 7 and 10 until refrigerant pressure
equalizes.
VALVE
1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
C
C
C
CONDITION
2. Transfer the remaining refrigerant.
a. Close valve 5 and open valve 4.
VALVE
1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
C
C
C
CONDITION
b. Turn off the chiller water pumps using the CVC/
ICVC (or manually, if necessary).
c. Turn off the pumpout condenser water, and turn on
the pumpout compressor to push liquid out of the
storage tank.
d. Close liquid line valve 7.
e. Turn off the pumpout compressor.
f. Close valves 3 and 4.
g. Open valves 2 and 5.
VALVE
1a 1b 2 3 4 5 6 7 8 10 11 12 13 14
C C
C C
CONDITION
h. Turn on the pumpout condenser water.
i. Run the pumpout compressor until the pumpout
storage tank pressure reaches 5 psig (34 kPa)
(18 in. Hg [40 kPa absolute] if repairing the tank).
j. Turn off the pumpout compressor.
k. Close valves 1a, 1b, 2, 5, 6, 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
l. Turn off pumpout condenser water.
Page 69
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