Procedures - Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual

PUMPOUT AND REFRIGERANT
TRANSFER PROCEDURES
The 23XRV chiller may come equipped
Preparation —
with an optional pumpout storage tank, pumpout system, or
pumpout compressor. The refrigerant can be pumped for
service work to either the chiller compressor evaporator vessel
or chiller condenser vessel by using the optional pumpout
system. If a pumpout storage tank is supplied, the refrigerant
can be isolated in the storage tank. The following procedures
describe how to transfer refrigerant from vessel to vessel and
perform chiller evacuations.
WARNING
Always run the chiller cooler and condenser liquid pumps
and always charge or transfer refrigerant as a gas when the
chiller pressure is less than 35 psig (241 kPa). Below these
pressures, liquid refrigerant flashes into gas, resulting in
extremely low temperatures in the cooler/condenser tubes
and possibly causing tube freeze-up.
WARNING
During transfer of refrigerant into and out of the optional
storage tank, carefully monitor the storage tank level gage.
Do not fill the tank more than 90% of capacity to allow for
refrigerant expansion. Overfilling may result in damage to
the tank or personal injury.
CAUTION
Do not mix refrigerants from chillers that use different
compressor oils. Compressor damage can result.
Operating the Optional Pumpout Unit
1. Be sure that the suction and the discharge service valves
on the optional pumpout compressor are open
L1
FIELD
L2
POWER
SUPPLY
L3
2
SS-1
OFF
AUTO
2
2
H1 H4
CONTROL POWER
X1 X2
TRANSFORMER
XFMR-1
69 VA
HIGH PRESSURE
SAFETY
NC OPEN > 185psig
X2
1
ON
LOW PRESSURE CONTROL
NC OPEN < 7 psia (-15.7 in. HG)
CLOSE > 9 psia (-11.6 in. HG)
3
Fig. 52 — 23XRV Pumpout Unit Wiring Schematic
(backseated) during operation. Rotate the valve stem fully
counterclockwise to open. Frontseating the valve closes
the refrigerant line and opens the gage port to compressor
pressure.
2. Ensure that the compressor holddown bolts have been
loosened to allow free spring travel.
3. Open the refrigerant inlet valve on the pumpout
compressor.
4. Oil should be visible in the pumpout unit compressor
sight glass under all operating conditions and during
shutdown. If oil is low, add oil as described under
Optional Pumpout System Maintenance section, page 95.
The pumpout unit control wiring schematic is detailed in
Fig. 52.
TO READ REFRIGERANT PRESSURES during pumpout or
leak testing:
1. The ICVC display on the chiller control center is suitable
for determining refrigerant-side pressures and low (soft)
vacuum. To assure the desired range and accuracy when
measuring evacuation and dehydration, use a quality vac-
uum indicator or manometer. This can be placed on the
Schrader connections on each vessel by removing the
evaporator or condenser pressure transducer (Fig. 5-7).
2. To determine pumpout storage tank pressure, a 30 in. Hg
vacuum –0-400 psi (–101 kPa -0-2769 kPa) compound
gage is attached to the storage tank.
3. Refer to Fig. 40-43 and 53, for valve locations and num-
bers.
Transfer, addition, or removal of refrigerant in spring-
isolated chillers may place severe stress on external piping
if springs have not been blocked in both up and down
directions.
C
2 OL
C
2 OL
C 2 OL
GND
L1
L2
6
X2
4 5 C
86
CAUTION
PUMP OUT
MTR-1
COMPRESSOR
HTR-1
8
CRANKCASE HEATER
240-600v
7
27-40 WATT
C — Contactor
FU — Fuse
GND — Ground
HTR — Heater
MTR — Motor
NC — Normally Closed
OL — Overload
SS — Selector Switch
LEGEND
a23-1615