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DN-Series Integrated Programmable Controls
DOAS
40
6.2.1.2 Dehumidification with Reheat from Heat Source
This dehumidification method uses any cooling source and heating source.
When the return (or outdoor, selectable) air dew point exceeds the 55°F (adjustable) the
dehumidification mode will be enabled. The air is cooled to a cooling coil leaving temperature
setpoint, usually 55°F or below. Then it is reheated to a CA temperature setpoint (or RA, based
on setting for heating), usually around 60°F. An adjustable PI loop will compare the measured
air temperature to the air temperature setpoint and adjust the analog output to
the valve. The NO1 heating enable contact is engaged whenever the heating output is at 1%
or higher.
To use this method you need to add a cooling coil leaving temperature sensor, P/N 131318,
and install it after the cooling method. It should be wired as described in the
Verify Unit
Configuration
section.
The status can be viewed in
Unit Status
.
TEMPERING CONTROL
SA
T
T
Cooling
Heat Source
Coil Leaving
Temperature
CA
Temperature
The settings for this method require that
u
Cool and Heat are enabled in the
Unit Configuration
u
Set Allow heat src in dehumid to YES in
I/O Configuration
u
A setpoint for the coil leaving temperature and the CA temp are set
The status can be viewed in
Unit Status
.
