IBC AHU 800, Installation & Operating Manual

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Note
If using a heat pump or air conditioner: consult the heat pump or air conditioner's wiring
instructions before connecting to the AHU.
A heat pump or air conditioner producing its own control voltage will require isolation relays. If
the heat pump or air conditioner's wiring diagram shows a thermostat connecting directly to the
heat pump or air conditioner's board (without an external transformer), then isolation relays will
be required.
See "Worked Examples" under "Installation." If in doubt, power the heat pump or air conditioner
before connecting to it, and measure for voltage across control contacts Y and C: a voltage
greater than ~2 Volts AC or DC indicates that isolation relays will be necessary.
Note
When using medium and high velocity systems, ensure proper duct design for optimal system
performance and noise levels. For reference, see "Duct Work" under "Installation."