IBC AHU 1600 - Page 2

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."