57 EN2R-9031 0402R15-NE
SYSTEM OPERATION S4585D
Atmospheric ignition control S4585D (see Fig. 73.)
After false flame check during self check time (T
c
) a built-in
igniter and pilot gas valve are switched on.
The ignition spark ignites gas and resulting flame is detected
by the combined flame/ignition rod.
Ignition is switched off immediately after flame is established
and main gas valve is then energized.
If the flame is lost during normal run, the main gas valve is
de-energized and re-ignition of pilot occurs.
Fan assisted ignition control S4585D (see Fig. 73.)
When there is a call for heat, fan is energized through no air
position of air proving switch after self check time (T
c
).
When sufficient air flow is proven by air proving switch, a
built-in igniter and pilot gas valve are swiched on.
The ignition spark ignites gas and resulting flame is detected
by the combined flame/ignition rod.
Ignition is switched off immediately after flame is established
and main gas valve is then energized.
If air flow is not proven by air proving switch automatic
ignition controller will remain in a waiting mode with fan
energized.
If the flame is lost during normal run, the main gas valve is
de-energized and re-ignition of pilot occurs.
No flame indication
If no flame indication is built in, the indicator ligths up if there
is no flame detection within the no flame indication period
(T
NF
)
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