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2.
Is the room air (Room Temp) displayed on the
BACview
remote, reading
150°F or more?
a.
Yes. The sensor circuit or the sensor itself is shorted. Unplug the input
jack from the AireLogic controller. Did the display change to -40°F or
less?
1)
No. There is a short in the controller input. Replace the
controller.
2)
Yes. Disconnect the sensor wiring at the sensor. Connect an
ohmmeter to the sensor. If it is shorted replace the sensor. At
77°F the resistance should be 10KΩ. See thermistor output
curve for other temperatures. If it is not shorted, there is a short
in the wiring between the sensor and the input plug. Determine
cause and rectify. Refer to Appendix I for a typical 10KΩ
thermistor output curve.
b.
No. Continue.
3.
Is the discharge air temperature (DA Tempt), displayed on the
BACview
remote, reading -40°F or less?
a.
Yes. The discharge air temperature sensor circuit or the sensor itself is
open. Jumper the input for the sensor. Did the display change to 150°F
or more?
1)
No. There is an open in the controller input. Replace the
controller.
2)
Yes. Disconnect the discharge air temperature sensor wiring at
the sensor. Connect an ohmmeter to the sensor. If it is open
replace the sensor. At 77°F the resistance should be 10KΩ. See
thermistor output curve for other temperatures. If it is not open,
there is a break in the wiring between the sensor and the input
plug. Determine cause and rectify.
b.
No. Continue
4.
Reset the alarm. Check and note the DC voltage at controller’s analog output
for the heating signal. Set the Heating Setpoint for 130°F. Set the HTG MAX
DA and HTG MIN DA Setpoints for 130°F. Did the Burner VDC, displayed
on the
BACview
remote, increase?
a.
No. Unless the outside air temperature is extremely warm the Burner
VDC should have increased to 7.5VDC or more. Close the manual
main gas valve closest to the burner and measure the discharge air
temperature. Is it less than 130°F?
1)
Yes. There is a problem with the controller program or
controller itself. Contact the factory.
2)
No. The outside air temperature is too hot to determine the
actual cause of the problem. Reset the alarm and recheck when
the outside air temperature is much cooler.
b.
Yes. This signal is fed to the signal conditioner. Disconnect the wires
from the signal conditioner’s input signal terminals and measure the
voltage on the wires. Is it the same as the voltage coming from the
controller?
1)
No. There is an open in the wiring from the controller output.
Correct wiring and reconnect the wires to the terminals on the
signal conditioner. Be sure the wire from the controller’s
ground terminal is connected to the signal conditioner’s ground
terminal.
