Carrier 040-420 - Manual (Page 27)

Table 5 Condenser Fan Sequence
FAN ARRANGEMENT FAN NUMBER(S) CONTROLLED BY
(60 Hz)
7, FC-1 Compressor Al
9, 1 0 FC-4 Compressor
FC-2
First Stage
11, 1 2 FC-5 Microprocessor
2, 3 , 4 FC-3
Second Stage
13, 14, 15, 16 FC-6 Microprocessor
2, 3, 4, 6 FC-2, FC-3
T h i r d S t a g e
11, 12, 14, 15, 1 6 FC-5, FC-6 Microprocessor
7, 8, F C - 1 Compressor Al
9, 17, 1 8 FC-4 Compressor
6
11, 12, 19
2, 3, 4,
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, T h i r d S t a g e
14, 15, 16, 19, 2 0 Microprocessor
(50 Hz) AND 7, 8, 1 0 FC-1 Compressor Al
9, 17, 1 8 FC-4 Compressor
FC-2
II, 12, FC-5
First Stage
Microprocessor
2, 3, 4, 13, Second Stage
14, 15, 16, 21, 22 FC-3, FC-6, FC-7 Microprocessor
1, 2, 3, 4, 5, 6, 11, 12, 13, FC-2, FC-3, FC-4, T h i r d S t a g e
14, 15, 16, 19, 20, 21, 2 2 FC-5, FC-6, FC-7 Microprocessor
*Control box.
box.
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
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 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
F (5.5” C) below the cooler
leaving fluid temperature, or reaches a saturated suction tem-
perature of -15 F (-26 C). No
is necessary if the
At shutdown, the cycle continues until the sat-
urated suction temperature for that circuit is 10” F (5.5” C)
below the saturated suction temperature when 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.
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