4.0 Operation
Once installation of the appliance is completed, and before operating the appliance, review the
following guidelines:
4.1 Sequence of operation
Mode Call From Activity
Heating Thermostat When there is a call for heat, R è W1 or W2 is
energized; fan speed ramps up to the maximum value
of its W1 or W2 range value.
When an AHU is connected to a tankless water heater
or boiler, the external pump is energized (pump relay is
closed).
When there is a boiler call for heat, the TT (boiler on
Heat 1) contacts close. Once demand is satisfied, the
TT contacts open to remove the call for heat. Then the
fan operates for a further 45 seconds while the pump
contacts operate for 30 seconds.
Cooling Thermostat When there is a call for cooling, R è Y1 or Y2 is
energized; fan speed ramps up to the maximum value
of its Y1 or Y2 range value.
If there is a heat pump, the O/B terminal is energized.
Once demand is satisfied, the compressor S1 and /or
S2 contacts open, and O/B is de-energized if there is a
heat pump. The fan operates for a further 45 seconds.
Heat pump Heat pump When there is a call for heat, R è Y1 or Y2 is
energized whereas R è O/B remains de-energized.
The operation of O/B can be changed in the
IBCconnect app.
The fan is energized and operates at Y1 or Y2 speed;
operates a low speed for 60 seconds.
Once demand is satisfied, the compressor S1 and / or
S2 contacts open. The fan will continue to operate for
45 seconds.
Humidification When the fan is running, and the humidifier is connected, the
AHUwill activate the humidifier as required.
De- When the fan is running, and the dehumidifier is connected,
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