Microprocessor Controller for DOAS
21
d
ehumidiFicaTion
p
rioriTy
The following priorities are used to determine what is more important in the unit:
temperature over dehumidification or heating over dehumidification. Both priority
selections determine when the unit is allowed to dehumidify.
1. Temperature over Dehumidification
Determines when the unit is allowed to dehumidify based on the space/return
air temperatures.
a. Temperature
- If temperature is set as the priority, box not checked, and the
space or return air is over cooled, dehumidification is locked out until the space
or return temperature is no longer overcooled.
b. Dehumidification
- If the priority is dehumidification, box checked, and the
space or return air is overcooled, the coil offset will be added to the coil leaving
set point. (Default 0ºF offset).
c. Overcooled
- If space or return reset is enabled, the target is considered
over cooled when it is 4°F below set point for 5 minutes. It remains overcooled
until the target is at set point and the over-cool logic has been active for a min
of 5 minutes.
2. Heating over Dehumidification
Determines when the unit is allowed to dehumidify when heating is active.
a. Heating
- If priority is set to heating, box in checked, the unit locks out
dehumidification while heating is active.
b. Dehumidification
- If priority is set to dehumidification, box is not checked,
the unit is allowed to switch to dehumidification when heating is active.
c
ompressor
d
ehumidiFicaTion
F
orce
.
In dehumidification mode, the lead compressor will continue to run as long as
the dehumidification mode sequence has been enabled in order to prevent
compressor cycling and potential reevaporation of moisture. To disable this
operation and allow the compressor to cycle in dehumidification mode, uncheck
the applicable cooling ramps.
