Microprocessor Controller for DOAS
17
Unit Enable
The controller is equipped with several menus to help guide users with altering program parameters. The following
menus can be accessed by pressing the button. To enter the desired menu, press the button.
The
Unit Enable
menu allows the user to enable and disable the unit through the
controller. Reference sequence of operation for additional unit starts/stop details.
The unit ships from the factory in a disabled state. To allow the unit to operate,
the controller must receive a run command from digital input ID4.
Jumper unit
terminals R - G to allow the unit to operate.
Change to (Enabled/Disabled):
Enables user to manually turn unit on/off via
display. Unit terminal
G
must have 24 VAC power to enable the unit.
Outdoor Air Reset Function
45°
50°
55°
60°
65°
50°
55°
60°
65°
70°
Outside Air Temperature (°F)
Supply Air Set Point
(°
F)
70°
75°
Control Variables
The
Control Variables
menu allows the user to view and adjust unit control
parameters.
m
eThod
For
T
emperaTure
c
onTrol
Set Point Selections:
Supply Temp Control –
The supply discharge set point is a constant value (e.g.
72°F). Reference Temperature Set point screen for set point adjustment.
Space Reset
–
The controller will reset the supply air temperature set point to
maintain the space temperature set point (requires space temp sensor). Reference
the Temperature Set point screen for space set point adjustment.
Return Reset
–
The controller will reset the supply air temperature set point to
maintain the return air temperature set point (requires duct mounted return air
temp sensor). Reference the Temperature Set point screen for return air set point
adjustment.
OA Reset –
The controller monitors the OA temperature and adjusts the desired
supply temperature set point accordingly. For example, when the OA is below
55°F, the controller will change the supply set point to 70°F. If the OA is above
65°F, the controller will change the supply set point to 55°F. If the OA temperature
is between 55°F and 65°F, the supply set point changes according to the OA
reset function. A visual representation of the OA reset function is shown below.
Reference Outside Set points for min and max outside air limits.
Control Variables
Temp Control
The
Temperature Control
menu allows the user to view and adjust temperature
control conditions of the unit.
Menu