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Control Variables
Fan Control
Exhaust Fan Control
26
Microprocessor Controller for DOAS
Menu
The Exhaust Fan Control menu allows the user to adjust exhaust control
setpoints.
T
HIS SCREEN DISPLAYS THE
A
D
P
.
IR
AMPER
OSITION
The exhaust fan delay will begin once the damper sequence is complete. This
delay can be used to offset starting times between the supply fan and exhaust
fan. This screen also provides the ability to enable the exhaust fan on a set
outdoor air damper position if the unit is equipped with a modulating outdoor air
damper.
T
M
HIS SCREEN DISPLAYS
INIMUM AND
P
.
ERCENTAGES
The speed set point is the proportional percentage of the analog output from the
controller to the VFD.
25% Speed = Min speed
100% Speed = Max speed
Possible Setpoint Sources:
Local – The fan speed will be constant; set from screen (e.g. 100%).
BMS – The BMS can directly control the fan speed (requires BMS communication
option).
Space Pressure – Fan speed is determined by building pressure control loop.
Supply Fan Tracking with Offset – The exhaust fan will track the supply fan,
between a minimum and maximum position. An offset can be added to achieve
the proper balance.
Outdoor Air Damper Tracking – The exhaust fan will proportionally track the
outdoor air damper, between a minimum and maximum position.
Return Duct Static Pressure – Fan speed is determined by duct pressure control
loop.
E
F
D
XHAUST
AN
ELAY AND
M
E
AXIMUM
XHAUST
E
O
NABLE BASED ON
UTSIDE
F
S
AN
PEED
®
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