Specifications

Page 16 of 36 / IM 1059-1
Figure 17: I/O Expansion Module Conguration
Jumper Terminals
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 an-
nunciator to identify operational fault conditions for the second
refrigeration circuit.
Table 14: I/O Expansion Module LED & Fault Outputs
Jumper Terminals
Status LED's
Thermostat Alarm
Mode / Fault
Y
ellow 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
Note: 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.
JP1 shorted in units with
2 compressors
JP1 through JP8 not
used with 2 circuit units
.