Sub-Zero 600 Series Technical & Service Manual page 22

Electronic Control System
600 Series
(Prior to #1810000)
Control Condenser Fan Operation (Models 611, 632, 642, 650, 690)
NOTE: Power to the condenser fan on models 601R and 601F is supplied direct from the compressor.
The microprocessor senses the 115 volt output supplied to both compressors. If either compressor is running, a sig-
nal is sent to the condenser fan relay on the control board to close, supplying power to the condenser fan. If both
compressors are off, the condenser fan is off. (See Figure 3-10)
NOTE: The condenser fan will run 100% if the VACUUM CONDENSER indicator is activated, This will be discussed in
MONITORS COMPRESSOR RUN DURATION.
Figure 3-10. Condenser Fan Power Signal Trace
3-8
#3756270 - Revision B - January, 2006