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DN-Series Integrated Programmable Controls
DOAS
42
TEMPERING CONTROL
6.3 HEATING
The heating requires that heating be enabled in the
Unit Configuration
. The heating type can
also be set here or in the
Control Settings
.
Dehumidification
and
Cooling Mode
Heating
Mode
Vent Mode
Sensible
Cooling
Mode
Design Dew Point
Outdoor Dry Bulb Temperature
6.3.1 Heating Mode
For any type of heating there is an outdoor air lockout temperature above which heating will
not be allowed. Note that the default is low. This is to insure that at start up, you can start your
fans without worrying if the tempering will also start. This value will need to be raised to an
acceptable value.
6.3.2 Setpoint Type and Control Type
For each type of heating, you can choose a setpoint type and a control type. Setpoint types
available:
u
Adjust: If you choose this it will allow you to set a heating setpoint.
u
OA Reset: You are prompted to set a reset schedule. In the screen shown, the setpoint will
be 70°F if the outdoor air is 0°F or below, and 60°F if the outdoor air is 50°F and above.
It will be linear between. For example, if the outdoor air is 25°F, the setpoint will be 65°F.
This method is useful to avoid overheating the space or to avoid excess cycling in warmer
temperatures.
Control types available:
u
CA: Be sure to install your CA temperature sensor far enough down the duct
to prevent over-cycling.
u
RA: If you are only feeding one space this is a useful control method. RA is
always used for unoccupied operation. RA should also be used when a staged heat source
is utilized.
