PUMPOUT AND REFRIGERANT
TRANSFER PROCEDURES
Preparation —
The 19XR may come equipped with an
optional pumpout storage tank, pumpout system, or pump-
out compressor. The refrigerant can be pumped for service
work to either the chiller compressor vessel or chiller con-
denser vessel by using the optional pumpout system. If a
pumpout storage tank is supplied, the refrigerant can be iso-
lated in the storage tank. The following procedures describe
how to transfer refrigerant from vessel to vessel and perform
chiller evacuations.
Always run the chiller cooler and condenser water pumps
and always charge or transfer refrigerant as a gas when
the chiller pressure is less than 30 psig (207 kPa). Be-
low these pressures, liquid refrigerant flashes into gas,
resulting in extremely low temperatures in the cooler/
condenser tubes and possibly causing tube freeze-up.
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.
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 (back-
seated) during operation. Rotate the valve stem fully
counterclockwise to open. Frontseating the valve closes
the refrigerant line and opens the gage port to compres-
sor pressure.
2. Ensure that the compressor holddown bolts have been loos-
ened 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 shut-
down. If oil is low, add oil as described under Optional
Pumpout System Maintenance section, page 68. The pump-
out unit control wiring schematic is detailed in Fig. 31.
TO READ REFRIGERANT PRESSURES during pumpout
or leak testing:
1. The CVC display on the chiller control panel 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 vacuum
indicator or manometer. This can be placed on the Schrader
connections on each vessel (Fig. 7) by removing the pres-
sure transducer.
2. To determine pumpout storage tank pressure, a 30 in.
-0-400 psi (-101-0-2769 kPa) gage is attached to the stor-
age tank.
3. Refer to Fig. 26, 27, and 32 for valve locations and
numbers.
Transfer, addition, or removal of refrigerant in spring-
isolated chillers may place severe stress on external pip-
ing if springs have not been blocked in both up and down
directions.
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. 31 — 19XR Pumpout Unit Wiring Schematic
OIL RETURN
LINE
CONNECTION
CONDENSER
WATER
CONNECTIONS
REFRIGERANT
INLET VALVE
Fig. 32 — Optional Pumpout Unit
62
Summary of Contents for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR
Page 13: ...Fig 10 Control Panel Fig 11 Power Panel 13 ...
Page 47: ...Fig 25 19XR Leak Test Procedures 47 ...
Page 102: ......
Page 103: ......