YORK INTERNATIONAL
72
the alarm circuit should fail to function,
YORK will not be liable for damages.
LEAD/LAG COMPRESSOR SELECTION
The chiller can be set up for AUTO or MANUAL Lead/
Lag. This is accomplished by configuring the S1 Dip
Switches properly on both Microprocessor Boards. De-
tails for doing this are discussed in the OPTIONS key
section.
When AUTO Lead/Lag is utilized, the micro determines
which compressor is assigned to the lead and the lag.
A new lead/lag assignment is made whenever both com-
pressors shut down. The respective micro will assign
the lead to one of the two compressors it directly con-
trols with the shortest anti-recycle time. This will tend to
balance run time between each pair compressors.
AUTO Lead/Lag will cause the lag compressor on the
Master or Slave Module to automatically become the
lead, anytime the compressor currently in the lead shuts
down due to a safety threshold being exceeded. This is
done to maintain water temperature as close to setpoint
FIG. 31 LOCATION OF THE MICROPROCESSOR BOARD
FIG. 32 ALARM CONTACT
CONNECTION LOCATION
26001A
LD01945
26000A
MICROPROCESSOR
BOARD
SYSTEM SWITCHES 1 - 4
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