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DN-Series Integrated Programmable Controls
DOAS
54
6.5 COMBINED TEMPERING
Combined Tempering are methods where the same control is used for heating and cooling.
These types include:
u
Single-stage heat pump with or without auxiliary heat
u
Two-stage heat pump with or without auxiliary heat
u
VRF with or without auxiliary heat
u
Dual Temp water coil which supplies heating or cooling, depending upon season
These methods require that both heating and cooling be enabled in the
Unit Configuration
. The
heating and cooling types can be set here or in the
Control Settings
.
6.5.1 Heat Pump 1-Stage: with or without 0–10VDC Aux Heat
This type requires cooling type On/Off and heating type HP 1 Stage. These type settings are
made here or in the
Control Settings
.
6.5.1.1 Heat Pump 1-Stage Mode
The mode is determined by the outdoor temperature and the heating and cooling lockout
temperature settings.
6.5.1.2 Heat Pump 1-Stage Cooling Operation
This type of cooling cycles one stage of cooling to maintain the cooling setpoint. You must set a
hysteresis value whereby the stage will turn on at the se hysteresis and turn at setpoint.
There is also a minimum on and off time to prevent over-cycling.
If in cooling mode, and the unit calls for cooling, it puts the tempering mode output used for
a reversing valve, in the cool position and after a delay, will turn the compressor on and off to
maintain the cooling setpoint.
TEMPERING CONTROL
