AAON Mini Controller User Manual - page 36
36
Single Zone VAV Heating Operation -
Supply Air Temperature Control
When the space temperature has deviated ½
of the space temperature deadband below
the heating space temperature setpoint
supply air temperature control is activated.
The first stage of heating modulates to
maintain the heating supply air temperature
setpoint.
As the space temperature achieves the
heating space temperature setpoint plus ½ of
the space temperature deadband the first and
second heating stages are de-activated.
Modulating/SCR electric heating operates as
a single stage of heating. Heating elements
modulate using a supply air temperature
sensor and setpoint potentiometer to meet a
specific supply air temperature setpoint.
Modulating natural gas heating operates as a
single stage of heating. Supply air
temperature setpoint must be set on the
MODGAS
board.
See
WattMaster
MODGAS
Controller
manual
for
modulating gas heat operation.
Equipment
with
Modulating Gas/SCR
Electric Heat will require an additional
supply air temperature sensor be field
installed for the modulating heating controls.
Constant Volume Heat Pump Heating
Operation - Space Temperature Control
When the space temperature has deviated ½
of the space temperature deadband below
the heating space temperature setpoint the
variable capacity scroll compressor is
activated. The compressor modulates to
maintain the heating space temperature
setpoint.
For heat pump units with the controller
configured for the reversing valve to be
activated during the heating mode of
operation, all reversing valves are activated
along with the variable capacity scroll
compressor.
For units with two stage heat pump heating,
if the variable capacity scroll compressor
operates at a maximum capacity for the
compressor stage delay amount of time and
the space temperature is still decreasing the
second compressor is activated and the
variable
capacity
scroll
compressor
modulates to maintain the heating space
temperature setpoint.
For units with two stage heat pump heating,
if the variable capacity scroll compressor
operates at a minimum capacity for the
compressor stage delay amount of time and
the space temperature is increasing the
second compressor is de-activated. The
variable capacity scroll compressor then
modulates to maintain the heating space
temperature setpoint.
As the space temperature achieves the
heating space temperature setpoint plus ½ of
the space temperature deadband, heat pump
heating de-activated.
If the space temperature has deviated ½ of
the space temperature deadband below the
heating space temperature setpoint for the
heating stage delay amount of time and the
outside air temperature is below the
compressor outside air temperature lockout,
if available, the first stage of emergency
heating is activated.
If the space temperature remains ½ of the
space temperature deadband below the
heating space temperature setpoint for
another heating stage delay amount of time
and the outside air temperature is below the
compressor outside air temperature lockout,
if available, the second stage of emergency
heating is activated.
As the space temperature achieves the
heating space temperature setpoint plus ½ of
the space temperature deadband and the
outside air temperature remains below the
compressor outside air temperature lockout,