Microprocessor Controller for DOAS
29
o
verride
e
xhausT
F
an
vFd s
peed
This screen only appears if the unit is equipped with a exhaust fan VFD controlled
by the microprocessor.
The speed is the proportional percentage of the analog output from the controller
to the VFD.
0% Speed = Min speed (determined by VFD)
100% Speed = Max speed (determined by VFD)
(Reference unit Installation and Operation Manual for VFD programming).
o
verride
The
p
osiTion
oF
The
o
uTside
a
ir
d
amper
This screen only appears if the unit is equipped with a modulating OA and
recirculation damper. The recirculation damper position will be the inverse of the
OA damper position shown.
0% = Outside air damper closed
100% = Outside air damper fully open
o
verride
The
c
ompressor
This screen only appears if the unit is equipped with DX cooling. When manual
override is set to enable, use the arrow buttons to turn individual compressor
requests on or off.
o
verride
The
m
odulaTing
c
ompressor
c
onTrol
l
oop
When manual override is set to enable, use the arrow buttons to change the
compressor modulation value.
o
verride
c
ooling
When the cooling control is in the manual mode, use the arrow buttons to vary the
cooling output.
Chilled Water
: The cooling percent is directly proportional to the 0 - 10 VDC
output signal.
0% Cooling = 0 VDC
100% Cooling = 10 VDC
Packaged Cooling
: The cooling percent displays compressor engagement as a
percent. The compressors are subject to the min on/off times and heating/cooling
lockouts.
o
verride
The
e
lecTric
h
eaTer
This screen only appears if the unit is equipped with electric post heat. Electric
heater percentage is directly proportional to the 0 – 10 VDC output signal.
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