4 G Gas Combustion Combination Controls and Systems—G961DAJ Integrated Function Ignition Control
The G961DAJ offers the following responses based on abnormal system
operation.
A pressure switch within the appliance provides proof of combustion air
flow. During a heating cycle, the G961DAJ control responds to the state
of this switch in the following ways:
1.
If the pressure switch is not open at the beginning of the heating
cycle, the control will wait for the switch to open.
2.
If the pressure switch does not close after the inducer motor has been
energized for 60 seconds, the inducer motor will be de-energized for
300 seconds, and then re-energized. This cycle will continue until the
pressure switch is proven closed, as long as the demand for heat
exists.
3.
If the pressure switch opens during the trial for ignition (before flame
is sensed), all outputs will be de-energized and the control will begin
another heating sequence beginning with Pressure Switch Detection.
4.
If the pressure switch opens during the run state (after flame is
sensed), the main valve will be de-energized, and the inducer and
blower will run for a 180 second purge. Once this purge period
expires, the control will begin another heating sequence beginning
with Pressure Switch Detection.
Note: If the pressure switch re-closes and remains closed within
12 power line cycles (forgiveness period), the operating cycle will
continue uninterrupted.
Any time flame is sensed while the gas valve is de-energized, the inducer
and blower motors will be energized. When flame is no longer sensed, the
inducer will be de-energized, and the blower will continue to run through a
30 second fan-off delay. Once expired, the control will respond to the
thermostat call.
If the first ignition attempt and the first retry both fail to establish flame,
the control will activate a self-healing over-temperature correction cycle
before the next retry. This is accomplished by running the inducer and
blower for 180 seconds, before proceeding to the third trial (second retry).
If flame is not sensed by the end of the trial for ignition period, the gas
valve is de-energized, the inducer runs through an interpurge period, and
another trial for ignition begins. If flame is not sensed before the end of
the fourth trial, the control proceeds to a 60 minute soft lockout period
(during which all outputs are de-energized) before resetting itself.
Abnormal
System
Operation
Pressure Switch
Detection
Undesired Flame
Self Healing
Function
Failure to Sense
Flame Within
Trial Period
