25-Pin Interlock Description - Lydall Affinity User Manual

25-Pin Interlock Description

Ground
AR2 Loop 2 Low Flow
CR2 Loop 1 Isolation Valve
CR1 Loop 2 Isolation Valve
Loop 1 Temperature Alarm
Loop 2 Temperature Alarm
AR3 Loop 1 Low Level
AR1 Loop 1 Low Flow
AR5 Refrigerant High Pressure
LOCAL/REMOTE
AR4 Loop 2 Low Level
O:\MANUALS\D6627 (11/12/2002)
Pin 1 is ground
Pins 3 and 4 are closed, pins 2 and 3 are open when the
unit is operating normally. Pins 3 and 4 are open, pins 2
and 3 are closed when an alarm condition exists.
Pins 5 and 20 operate a control relay to CR1. With this
coil energized via a customer supplied 24 Volts DC signal,
the Loop 1 isolation valve opens, allowing flow out of the
unit.
Pins 6 and 20 operate a control relay CR2. With this coil
energized via a customer supplied 24 Volts DC signal, the
Loop 2 isolation valve opens, allowing flow out of the unit.
Pins 7 and 8 are open when the temperature is within the
setpoint range and closed when the temperature is < or >
than the setpoint range.
Pins 9 and 10 are open when the temperature is within the
setpoint range and closed when the temperature is < or >
than the setpoint range.
Pins 12 and 13 are closed, pins 11 and 12 are open when
the unit is operating normally. Pins 12 and 13 are open,
pins 11 and 12 are closed when an alarm condition exists.
Pins 15 and 16 are closed, pins 15 and 14 are open when
the chiller is operating normally. Pins 15 and 16 are open,
pins 15 and 16 are closed when an alarm condition exists.
Pins 18 and 19 are closed and pins 17 and 18 are open
when unit is running normally. Pins 18 and 19 are open
and pins 17 and 18 are closed when an alarm condition
exists
Pins 21 and 22 control the Local/Remote Option
Pins 24 and 25 are closed, pins 23 and 24 are open when
the unit is operating normally. Pins 24 and 25 are open,
pins 23 and 24 are closed when an alarm condition exists.