IBC AHU Series Installation And Operating Manual

3.6.5 De-humidification Mode
Upon a call for de-humidification from the thermostat:
G to W or Y is energized.
The de-humidifier's contacts (24V output) will close.
3.6.6 Freeze Protection Mode
Freeze protection mode monitors the return air temperature into the air handling unit.
If the internal return air temperature sensor detects a return air temperature below 41°F the air handling unit
will energize the fan , the pump contacts and the TT (boiler) contacts to create a call for heat. When the return
air temperature increases to 46°F or more the air handling unit will turn off the fan, TT (boiler) contacts and
pump contacts.
If the internal return air temperature sensor detects a return air temperature below 35°F the air handling unit
will turn off the fan and continue to energize TT (boiler) contacts and pump contacts.
3.7 LED status indicators
The AHU displays four LED indicators, each representing an operating status.
POWER (Green background) FAULT (Red
background)
HEAT (Green
background)
COOL(Green
background)
State LED(s) Description
Standby FAULT HEAT COOL Each LED blinks on and off in a
“Chasing” sequence.
Heating HEAT LED displays a steady state.
Cooling COOL LED displays a steady state.
Fan only (G) HEAT COOL Short synchronized flashing.
Warning FAULT LED flashes on. The AHU will continue to
operate, though certain operations may
not function correctly.
Fault FAULT LED displays a steady state. The AHU
will not service heat or cooling calls.
Table 8 Status indicators
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3.6.5 De-humidification Mode

IBC AHU Series Specifications

General

Brand	IBC
Model	AHU Series
Category	Air Handlers
Language	English