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YORK INTERNATIONAL
FORM 150.52-NM2 (1001)
VOLTS FREE CONTACTS
Chilled Liquid Pump Starter
Terminals 25 and 26 (Figures 11 and 12) close to start
the chilled liquid pump. This contact can be used as a
master start/stop for the pump in conjunction with the
daily start/stop schedule.
Run Contact
Terminals 29 and 30 (Figures 11 and 12) close to indi-
cate that a system is running.
Alarm Contacts
Each system has a voltage-free change over contact
which will operate to signal an alarm condition when-
ever a system locks out, or there is a power failure. To
obtain system alarm signal, connect the alarm circuit to
volt free terminals 23 and 24 (Figures 11 and 12) for
No. 1 System and to terminals 27 and 28 (Figures 11
and 12) for No.2 System.
SYSTEM INPUTS
Flow Switch
A chilled liquid flow switch of suitable type must be
connected to terminals 13 and 14 (Figures 11 and 12) to
provide adequate protection against loss of liquid flow.
Remote Run/Stop
Connect remote switch(es) in series with the flow switch
to provide remote run/stop control if required.
Remote Print
Closure of suitable contacts connected to terminals 13
and 18 (Figures 11 and 12) will cause a hard copy print-
out of Operating Data/Fault History to be made if an
optional printer is connected to the RS 232 port.
Remote Setpoint Offset – Temperature
Timed closure of suitable contacts connected to termi-
nals 13 and 17 (PWM contacts) will provide remote
offset function of the chilled liquid setpoint if required.
Remote Setpoint Offset – Current
Timed contact closure of a suitable contact connected
to terminals 13 and 16 (Figures 11 and 12) (PWM con-
tacts) will provide remote offset of EMS% CURRENT
LOAD LIMIT.
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