Control Condenser Fan Operation - Sub-Zero Wolf BI Series Service Manual

Electronic Control

Control Condenser Fan Operation

The microprocessor observes the power output to both compressors; if power is being supplied to either compres-
sor, a signal is sent to the condenser fan relay on the control board to close, supplying power to the condenser fan
motor (See Figure 2-38). If both compressors are OFF, the condenser fan will be OFF.
1. Power output to
compressors
observed by
microprocessor
7040317 - Revision A - September, 2015
Built-In (BI) Series
Built-In (BI) Series
HIGH VOLTAGE






1 NEUTRAL
4 L1
6 L1
1 MAIN LIGHTS
3 COMP 1
5 COMP 2
8 DEFROST HTR
9
1
6
1

Figure 2-38. Signal Trace Schematic: Condenser Fan Operation



2. If power is supplied to
either compressor, the
condenser fan is energized










 








2-22
(SWS #4380000)
(SWS #4380000)


660 Ω

160 Ω










2300-2900 Ω

27.9-30.9 Ω



















