Carrier 19MV Series - Controls and Components; Pumpout Unit

10
Fig. 7 — 19XR Pumpout System Wiring Schematic
Fig. 8 — Pumpout Unit Wiring Schematic
CONTROLS AND COMPONENTS
Figure 1 shows the major components of the PPS system.
Pumpout Unit
The pumpout unit consists of a hermetic compressor, a water
cooled refrigerant condenser, an oil separator, and prewired safety
and control devices. The pumpout unit comes equipped with a
4-way transfer valve manifold to interconnect both liquid and
vapor transfer and to pressurize the chiller during transfer of re-
frigerant from chiller to storage tank.
CONTROLS
The pumpout unit has the following controls: manual/off/automat-
ic selector switch, transformer, .25 amp fuses for the primary side
of the transformer, 5 amp fuse for the secondary side of the trans-
former, contactor, terminal strip, high pressure cutout switch and
low pressure switch.
a19-2447
LOW PRESSURE CONTROL
NC OPEN < 7 psia (-15.7 in. HG)
CLOSE > 9 psia (-11.6 in. HG)
HIGH PRESSURE
SAFETY
NC OPEN > 185psig
CONTROL POWER
TRANSFORMER
XFMR-1
69 VA
PUMP OUT
COMPRESSOR
CRANKCASE HEATER
240-600v
27-40 WATT
COPELAND PN 081-0031-03
WHT
RED
ORN
HIGH LEVEL
GAGE ALARM
(NC-OPEN AT
90% STORAGE
TANK LEVEL)
WHT
X2
C
5
4
X2
X2
1
X1
FU3
0.5A
H1
H4
FU1
FU2
0.25A 0.25A
GND
2
2
3
SS-1
OFF
AUTO ON
2
L2
L1
8
7
HTR-1
MTR-1
2 OL
2 OL
2 OL
C
C
C
LEVEL GAGE
ALARM SWITCH
NO
NC
LEGEND
C—Contactor
FU — Fuse
GND — Ground
HTR — Heater
MTR — Motor
NC — Normally Closed
OL — Overload
SS — Selector Switch
a19-2448
Low Pressure Control
NC Open < 7 psia {-15.7 in. HG}
Close > 9 psia {-11.6 in. HG}
High Pressure
Safety
NC Open > 185 psig
Control Power
Transformer
XFMR-1
69 VA
Pump Out
Compressor
Crankcase Heater
240-600v
27-40 watt
X2
C
5
4
X2
X2
1
X1
FU3
0.5A
H1
H4
FU1
FU2
0.25A 0.25A
GND
2
2
3
SS-1
Off
Auto On
2
L2
L1
8
7
HTR-1
MTR-1
2 OL
2 OL
2 OL
C
C
C
LEGEND
C—Contactor
FU — Fuse
GND — Ground
HTR — Heater
MTR — Motor
NC — Normally Closed
OL — Overload
SS — Selector Switch