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During transfer of refrigerant into and out of the optional stor-
age 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 tank or release
of refrigerant which will result in personal injury or death.
CAUTION
Do not mix refrigerants from chillers that use different com-
pressor oils. Compressor damage can result.
Operating the Optional Pumpout Unit
For a view of the optional pumpout unit, see Fig. 37.
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 Mainte-
nance section, page 50. The pumpout unit control wiring schemat-
ic is detailed in Fig. 38.
TO READ REFRIGERANT PRESSURES (during pumpout or
leak testing):
1.
The display on the chiller control panel is suitable for
determining refrigerant-side pressures and low (soft) vac-
uum. To assure the desired range and accuracy when mea-
suring evacuation and dehydration, use a quality vacuum
indicator or manometer. This can be placed on the
Schrader connections on each vessel by removing the
pressure transducer (Fig. 3-5).
2.
To determine pumpout storage tank pressure, a 30 in. Hg
vacuum -0 to 400 psi (101-0-2758 kPa) gage is attached to
the storage tank.
3.
Refer to Fig. 33 and 34 for valve locations and numbers.
CAUTION
Transfer, addition, or removal of refrigerant in spring-isolated
chillers may place severe stress on and damage external piping
if springs have not been blocked in both up and down
directions.
FIELD
POWER
SUPPLY
DANGER
L1
L2
L3
H1
H4
CONTROL POWER
X1
X2
TRANSFORMER
XFMR-1
69 VA
HIGH PRESSURE
SAFETY
NC OPEN > 185psig
X2
2
1
SS-1
OFF
AUTO
ON
2
LOW PRESSURE CONTROL
NC OPEN < 7 psia (-15.7 in. HG)
CLOSE > 9 psia (-11.6 in. HG)
2
3
Fig. 38 — Pumpout Unit Wiring Schematic
POSITIVE PRESSURE CHILLERS WITH STORAGE TANKS
In the Valve/Condition tables that accompany these instructions,
the letter "C" indicates a closed valve. Figures 33 and 34 show the
locations of the valves.
Always run chiller cooler and condenser water pumps and al-
ways charge or transfer refrigerant as a gas when chiller vessel
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 caus-
ing tube freeze-up.
Control
Panel
Valve
2
Valve
4
Valve
5
Entering
Water
Leaving
Water
C
2 OL
C
2 OL
C
2 OL
GND
L1
8
L2
7
6
X2
C
4
5
41
CAUTION
Frame
Assembly
Valve
3
Heater
Oil
Separator
Condenser
Fig. 37 — Pumpout Unit
PUMP OUT
MTR-1
COMPRESSOR
HTR-1
CRANKCASE HEATER
240-600v
27-40 WATT
LEGEND
C
— Contactor
FU
— Fuse
GND — Ground
HTR — Heater
MTR — Motor
NC
— Normally Closed
OL
— Overload
SS
— Selector Switch
Compressor
Oil
Oil Fill
Fitting
a23-1546
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