AAON RQ-006 - Manual (Page 61)

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or by an auxiliary limit mounted in the
supply fan compartment.
Electric Heating Operation
When a call for heating (G and W1, W2,
etc.) is made the supply blower motors and
electric resistance heaters will energize.
Heating
is accomplished by passing
electrical current through a specified amount
of resistance heaters which will produce the
required heat.
On a fault condition the main limit located
in the supply air or the auxiliary limit
located downstream the supply blower will
remove power from all contactors.
Steam or Hot Water Preheating and
Heating Operation
Valve control for steam and hot water
heating coils are by others. Heating is
accomplished by passing steam or hot water
through the steam or hot water coil
assembly.
Chilled Water or Non-Compressorized
DX Cooling Operation
Controls for chilled water cooling coils and
non-compressorized DX coil are by others.