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MICROPROCESSOR BOARD
FIG. 36 – LOCATION OF THE MICROPROCESSOR BOARD AND SYSTEM SWITCHES
contacts, MUST be suppressed at the load. (Connect the
suppressor across the coil of the relay or contactor.) Use
YORK P/N 031-00808-000 suppressor (Typically, several
are supplied loose with the panel). Failure to install
suppressors will result in nuisance faults and possible
damage to the chiller.
CAUTION: If the alarm circuit is applied in an application
used for critical duty (such as process duty
or cooling other critical equipment) and the
alarm circuit should fail to function, YORK
will not be liable for damages.
LEAD/LAG COMPRESSOR SELECTION
The chiller may be set up for AUTO or MANUAL Lead/Lag.
This is accomplished by properly configuring the S1 Dip
Switches on the Microprocessor Board. Details for
configuring the switches are discussed in the "Display
Key" Section under OPTIONS key.
When AUTO Lead/Lag is utilized, the micro attempts to
balance run time between the two compressors. A
number of conditions can occur which will prevent this
126
27962A
TB1
FIG. 37 – ALARM CONTACT CONNECTION
LOCATION TO TB1
SYSTEM SWITCHES 1-4
ON MICROPROCESSOR BOARD
MAIN ELECTRICAL
CONTROL PANEL
LD01099
YORK INTERNATIONAL
26001A
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