22
CAUTION
6.
Verify that the alignment of the NOx screens is at 6
thermometers in supply and return air registers as close
sample temperature directly from the unit heat exchangers,
1.
2.
speed.
NORMAL SEQUENCE OF OPERATION
NOTE: ON UNITS WITH DDC CONTROLS OPTION
INSTALLED, REFER TO THE DDC CONTROLLER USER
MANUAL FOR SEQUENCE OF OPERATION DETAILS.
Check the limit to make sure it has not tripped. The limit
shock.
1.
2. D1 on IIC energizes venter motor contactor.
3. Venter motor contactor energizes the venter motor.
4. Operation of the venter motor closes the pressure
Unless excessive temperatures or shipping shock
15-second pre-purge time delay. During this period,
any residual gas.
5. After the pre-purge period, the ignition control
6.
7.
discontinue the ignition spark.
8.
If the third attempt is unsuccessful, the controller
9.
contacts after a delay of approximately 30 seconds.
starts the supply fan motor. Operation of the supply
fan circulates air across the heat exchanger and
delivers heated air to the conditioned space.
10.
11. The furnace has three high temperature limit controls,
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