Dexon Canada Air Systems Inc
OWMDH Series Use Manual
Version 07.2019
Page
14
6.2 MAIN 95DH CONTROL BOARD
12VDC output to
Crydom SS Heating
Relays. May be
Pulsing or Steady
24VDC stg1 stg2 stg3
Fan Adjustment
Potentiometer
To normally closed
overheat thermostat
in heat exchanger
TachOP PCB Jack
“SP4” – Low Temp Restart Test Pin. Positive
Lead on DC Volt Meter 0-20V Range
“SP1” – Stage 1 Temp. Set Point Test Pin.
Positive Lead on DC Volt Meter 0-20V Range
“DP” – Discharge Temperature Test Pin.
Positive Lead on DC Volt Meter 0-20V Range
“COM” Common Test Pin. Negative Lead on
DC Volt Meter 0-20V Range
“SP” – Set Point Potentiometer for Discharge
Temperature Adjustments
Temperature Sensor Jack
0 to 10VDC should be
present here. Fan volts
are variable with Fan
Adjustment Pot
0-10VDC 24VDC n/c com
120Volt Power
120VAC should be
present here
“Low Temp.” shut down bypass timer
LED: The LED will blink until the timed
delay has ended. Note: In order to
allow time for the heat sensor to reach
its set point temperature a 7-8 minute
bypass is built into the controller for
cold starts. If the discharge
temperature is below 0
°
C and the set
point is not reached in the allotted
time the blower heater will go into a
“Low Temp.” shut down condition.
Controller Fuse Brackets
–
500MA - Type AGC Fuse
IMPORTANT: Please contact
Dexon Canada Air Systems
Inc. before adjusting any
potentiometers (pots). There
are only 2 pots that can be
adjusted onsite and this
should only be done when
absolutely necessary and by
qualified personnel only.
“SP3” – Stage 3 Temp. Set Point Test Pin.
Positive Lead on DC Volt Meter 0-20V Range
“SP2” – Stage 2 Temp. Set Point Test Pin.
Positive Lead on DC Volt Meter 0-20V Range
Heat 2
Heat 3
Common
Manual Reset
Heat 1
Fan
Overheat
Low Temp.
Fan Stopped
12VDC Power
TO STATUS
BOARD
