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Honeywell 1000 Series Instruction Sheet Page 21

Ignition controls for combined valve and ignition system.
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NOTE 13.: If an external LPG valve and gas pressure switch
are connected, the LPG valve is energized after
call for heat.
The ignition control stays in waiting mode, until the
gas pressure switch is closed.
If during normal operation the gas pressure switch
opens, the gas valves will not be closed.
Suffix AF and PF (see fig. 37.)
When there is a call for heat a self check period (T
waiting period (T
) elapses before built--in igniter and gas
w
valve are switched on.
The ignition spark ignites gas and resulting flame is detected
by the flame rod.
After flame establishment a predetermined, extended ignition
time can be included.
If flame is not established within the safety time (T
S4565 ignition control locks out.
If the flame is lost during normal run, the S4565 ignition
control repeats start sequence.
Suffix BF and QF (see fig. 38.)
When there is a call for heat a self check period (T
waiting period (T
) elapses before built--in igniter and pilot gas
w
valve are switched on.
The ignition spark ignites pilot gas and resulting flame is
detected by the flame rod.
After flame establishment a predetermined, extended ignition
time can be included then the main valve is switched on.
If flame is not established within the safety time (T
S4565 ignition control locks out.
If the flame is lost during normal run, the S4565 ignition
control repeats start sequence.
Suffix CF and RF (see fig. 39.)
When there is a call for heat the fan starts running through the
LPG
T
T
c+
w
no air position of the air proving switch after a self check
period (T
When sufficient air flow is proven by the air proving switch, the
built--in igniter and gas valve are switched on.
The ignition spark ignites gas and resulting flame is detected
by the flame rod.
Ignition is switched off after a predetermined extended ignition
time and flame establishment.
If flame is not established within the safety time (T
) plus
c
S4565 ignition control locks out.
If the flame is lost during normal run, the S4565 ignition
control repeats start sequence.
If no air is proven by the air proving switch within the safety
time (T
Suffix DF and TF (see fig. 40.)
), the
When there is a call for heat the fan starts running through the
s
no air position of the air proving switch after a self check
period (T
When sufficient air flow is proven by the air proving switch, the
built--in igniter and pilot gas valve are switched on.
The ignition spark ignites pilot gas and resulting flame is
) plus
c
detected by the flame rod.
Ignition is switched off after a predetermined extended ignition
time (T
switched on.
If flame is not established within the safety time (T
S4565 ignition control locks out.
If the flame is lost during normal run, the S4565 ignition
), the
s
control repeats start sequence.
If no air is proven by the air proving switch within the safety
time (T
If the internal main burner interrupt is activated (relay contact
opened or opto transistor de--activated) the main valve drops
off, but the pilot flame stays present.
T
T
T
FR
c+
w
Fig. 37. Functional diagram S4565AF, PF
21
) plus waiting period (T
c
), the ignition control locks out.
s
) plus waiting period (T
c
)and flame establishment and then the main valve is
ext
), the ignition control locks out.
s
Legend
LPG
T
s
).
w
), the
s
).
w
), the
s
Thermostat
LPG outdoor valve
Ignition
Gas valve
Flame rod
Alarm
EN1R- -9161 0006R10- -NE

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