Dexon Canada Air Systems Inc
OWMDH Series Use Manual
Version 07.2019
Page
10
To create the required demands using the Dexon Temperature Simulator (Fig.2), unplug the temp
sensor from the main 95DH Main Controller and plug the simulator in its place as shown in Fig.3.
Temp. Sensor Jack
with Dexon Simulator
Connection
Temp, Sensor
Disconnected
Fig. 2: Temperature Simulator
Fig. 3: Temperature Simulator Connections
1. Start the unit and let it run for APPROX. 8-10 minutes to allow the
“Low Temp.” override timer to
time out.
2. Create a heating demand by placing the temperature sensor in ice water or using the Dexon
Temp. Simulator as described above. Once the heat demand has been created the “Element 1”
LED should light up and there should be current draw at TB8.
3. Create a low temperature condition as described above with ice water or with the Dexon Temp.
Simulator to drop the discharge temperature to 0
°
C.
The “Low Temp.” LED should light up and
the fan should shut down followed by a “Fan Stopped” indication.
4. After the unit has shut down turn the fan switch on the status board t
o “Manual” (this overrides
the “Low Temp.” shut down feature). The fan will come on at full speed and the “Fan Stopped”
LED will then go out and the heating elements will come on.
5. With the unit still in a low temperature co
ndition move the fan switch back to “Auto”. This will
cause the fan and heating elements to shut down again and the
“Low Temp.” LED and “Fan
Stopped
” LED to light up again.
6. With the unit back in
“Auto” mode and still in “Low Temp.” condition press the “Reset” switch to
initiate the 7-8 minute override timer. This will allow the fan and heating elements to operate
regardless of the “Low Temp.” condition and the “Low Temp.” LED should go out when the
discharge temperature is above 2
°
C (typically).
