Specifications

IM 1060-3 / Page 15 of 32
Figure 13: I/O Expansion Module Configuration Jumper
Terminals
Jumper Terminals
JP1 shorted in units with
2 compressors
JP1 through JP8 not
used with 2 circuit units.
I/O Expansion Module
The I/O Expansion Module is factory-installed for control of
the second refrigeration circuit.
The I/O Expansion Module has an independent LED annun-
ciator to identify operational fault conditions for the second
refrigeration circuit.
Table 6: I/O Expansion Module LED & Fault Outputs
Status LED's
Thermostat Alarm
Mode / Fault
Yellow Green Red
Light Output
Terminal “A”
Invalid Conguration
Flash Flash Off De-energized
Jumper Setting
Base Board
Off Flash Flash N/A
Communication Fail
High Pressure #2 Fault Off Off Flash De-energized
Low Pressure #2 Fault Off Off On De-energized
Low Suction Temp #2 Fault Flash Off Off De-energized
Sensor Failures Low Suction
Low Suction Temp #2, Flash Flash On De-energized
1
EWT (w/ Boilerless EH only)
2
Service Test Mode Enabled Flash Flash Flash De-energized
Unoccupied Mode On On Off Energized
Occupied, Bypass,
Standby, or Tenant
Off On Off Energized
Override Modes
Normal Operation Off On Off De-energized
Notes: Mode / Faults are listed in order of priority.
1
Boilerless electric heat only
2
Alarm/fault LED indications take precedence over
service test mode LED indication. The controller shall
use service test mode if the service test mode jumper
is installed, even if the LED’s indicate an alarm/fault.