12
Sequence of Operation
Condensing PV Series
12
Abnormal Operation (cont.)
times, then 3 times twice with 3 second pauses. The error self clears if the
fault clears for at least 15 seconds.
c.
Water temperature in excess of ECO (Energy Cut Out) limit
-The gas
control immediately turns off the pilot & main valves and proceeds to flash 4
times with a 3 second pause. The blower continues to run until the gas
control is reset. To reset the control, rotate the temperature control knob to
the minimum setting for at least 6 seconds before returning to the desired
temperature setting.
3. Pressure Switch/Blower Temperature Fault:
a.
Pressure switch closed at start of call for heat
-the gas control waits 4
seconds, then proceeds to flash 2 times a with 3 second pause. The control
waits 2 minutes and then turns on the blower for 30 seconds. The blower
turns off after 30 seconds and the control waits for the pressure switch to
open. Any time the pressure switch opens, the blower turns on (or stays on)
and the control proceeds to wait for the pressure switch to close.
b.
Pressure switch or blower temperature switch failed to close
-the gas
control runs the blower for 30 seconds waiting for the pressure switch and/or
blower temperature switch to close. If either switch does not close in 30
seconds, the blower turns off and the control flashes 3 times with a 3 second
pause. The gas control waits 2 minutes before turning on the blower for
another 30 seconds to check if the circuit will close. This cycle repeats as
long as there is a call for heat or until the circuit closes.
c.
Pressure switch or blower temperature switch opens during burner
operation
-the gas control turns off the pilot and main valve and runs the
blower for 15 seconds (inter-purge), waiting for the pressure switch and/or
blower temperature switch to close. If either switch fails to close, the control
proceeds as described in 3b above. If the circuit closes again by the end of
the inter-purge, the recycle counter is incremented, if the recycle count has
not reached its limit (4), another trial for ignition begins. If the recycle count
has been reached, the gas control turns off the blower and flashes 6 times,
then 2 times with a 3 second pause. The gas control waits 5 minutes before
repeating ignition sequence.
4. Trial for Ignition Fault:
a.
Pressure switch opens during trial
-the gas control turns off the igniter and
pilot valve. The gas control proceeds as described in 3b above. If the
pressure switch closes within 30 seconds, the gas control will continue with
trial for ignition starting at blower pre-purge.
b.
Flame not sensed
-the gas control energizes the spark igniter attempting to
light the pilot and prove flame. If the flame is not sensed within 90 seconds,
the igniter turns off, the pilot valve is closed and the gas control runs the
