Microprocessor Controller for DOAS
29
®
T
HIS
SCREEN
ALLOWS
THE
USER
TO
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).
T
HIS
SCREEN
ALLOWS
THE
USER
TO
O
VERRIDE
THE
P
OSITION
OF
THE
O
UTDOOR
A
IR
D
AMPER
.
This screen only appears if the unit is equipped with a modulating outdoor air and
recirculation damper. The recirculation damper position will be the inverse of the
outdoor air damper position shown.
0% = Outdoor air damper closed
100% = Outdoor air damper fully open
T
HIS
SCREEN
ALLOWS
THE
USER
TO
O
VERRIDE
THE
C
OMPRESSOR
O
PERATION
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.
T
HIS
SCREEN
ALLOWS
THE
USER
TO
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.
T
HIS
SCREEN
ALLOWS
THE
USER
TO
O
VERRIDE
THE
C
OOLING
O
PERATION
.
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 minimum on/off times and heating/
cooling lockouts.
T
HIS
SCREEN
ALLOWS
THE
USER
TO
O
VERRIDE
THE
E
LECTRIC
H
EATER
O
PERATION
.
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.
Menu
