Microprocessor Controller for DOAS
23
®
S
CREENS
DISPLAY
E
CONOMIZER
C
ONTROL
V
ARIABLES
.
This screen only appears if economizer functionality was provided with a
modulating outdoor air damper.
The outside air damper will modulate between the minimum and maximum
position to maintain the supply temperature setpoint.
The user can select the economizer control method from the following options:
Outside Dry Bulb
– Economizing is allowed when the outside dry bulb is less
than the economizer temperature enable setpoint.
Outside Enthalpy
- Economizing is allowed when outside enthalpy is less than
the economizer enthalpy setpoint.
Comparative Dry Bulb
- Economizing is allowed when outside temperature is
less than the space or return temperature.
Comparative Enthalpy
- Economizing is allowed when outside enthalpy is less
than the space or return enthalpy.
T
HIS
SCREEN
DISPLAYS
THE
H
YSTERESIS
S
ETTINGS
FOR
E
CONOMIZER
C
ONTROL
.
There is a built-in hysteresis that disables economizer above the economizer
setpoint.
(Example: If Economizer Outside Dry Bulb = 65°F, economizer operation is
disabled above 67°F).
T
HIS
SCREEN
DISPLAYS
THE
E
NERGY
R
EDUCTION
O
NLY
C
ONTROL
.
If enabled, the OA damper and recirculation damper will not modulate during
economize. Instead, only the energy recovery wheel will be stopped to ensure no
energy is transferred from the supply airstream and exhaust airstream.
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