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Table 5
-
Condenser Fan Sequence
(cant)
FAN ARRANGEMENT
FAN NUMBER(S) FAN
C~;;jACToR
CONTROLLED BY
30GT225
30GT250 (60 Hz)
7, 8
FC-1
Compressor Al
9, 10
FC-4 Compressor
61
5,
6
FC-2
First Stage
11, 12
FC-5 Microprocessor
1,
2,
3, 4
FC-3
Second Stage
13, 14, 15, 16
FC-6
Microprocessor
1,
2, 3, 4,
5,
6 FC-2, FC-3
Third Stage
11,
12, f3,
14, 15, 16
FC-5, FC-6
Microprocessor
7, 8, 10
FC-1
Compressor
Al
9, 17, 18
FC-4
Compressor Bl
5,
6
11, 12, 19
1,
2, 3, 4,
13,
14, 15, 16, 20
FC-2
First Stage
FC-5 Microprocessor
Second Stage
FC-3, FC-6,
FC-7 Microprocessor
1,
2, 3, 4, 5, 6, 11, 12, 13,
FC-;&F6c;3kF;-5,
Third Stage
14, 15, 16,
19, 20
-3
-
Microprocessor
30GT250 (50 Hz) AND 30GT280
7, 8, 10 FC-1
Compressor Al
9,
17, 18
FC-4 Compressor Bl
5,
6
FC-2
II, 12, 19,20 FC-5
First Stage
Microprocessor
1,
2, 3, 4, 13,
Second Stage
14, 15, 16, 21, 22 FC-3,
FC-6, FC-7 Microprocessor
L
1, 2, 3, 4, 5, 6, 11, 12, 13,
FC-2, FC-3, FC-4, Third Stage
14, 15, 16, 19, 20, 21, 22 FC-5,
FC-6, FC-7
Microprocessor
/
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i
*Control box.
/;
k.
tPower box.
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Pumpout
-
When the lead compressor in each circuit
saturated suction temperature is below -15 F (-26 C). At
is started or stopped, that circuit goes through a
pumpout
this point, the EXV starts to open and continues to open
cycle to purge the cooler and refrigerant suction lines of
gradually to provide a controlled start-up to prevent liquid
refrigerant.
flood-back to the compressor.
The
pumpout
cycle starts immediately upon starting the
lead compressor and continues until the saturated suction
temperature is 10” F (5.5” C) below the saturated suction
temperature at start-up, is
10”
F (5.5” C) below the cooler
leaving fluid temperature, or reaches a saturated suction tem-
perature of -15 F (-26 C). No
pumpout
is necessary if the
At shutdown, the
pumpout
cycle continues until the sat-
urated suction temperature for that circuit is 10” F (5.5” C)
below the saturated suction temperature when
pumpout
is
initiated, or saturated suction temperature reaches -15 F
(-26 C). At that point, the compressor shuts down and the
EXV continues to move until fully closed.
27