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Honeywell 1000 Series Instruction Sheet Page 11

Ignition controls for combined valve and ignition system.
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SYSTEM OPERATION
General
The S4565AD, BD, CD, DD, PD, QD, RD, TD ignition control
can provide both closed--loop sparking and sparking to
ground.
If the S4565AD, BD, CD, DD, PD, QD, RD, TD will be used in
sparking to ground applications, the upper spark tab has to be
grounded.
Lock- out reset
The S4565 can be is reset by either depressing the
internal/external reset button (suffix AD, BD, CD and DD) or
by interrupting the permanent life (suffix PD, QD, RD and TD).
NOTE 6.: When first starting, the inition control can be in the
lock--out condition; reset the ignition control.
After a reset an extended waiting time will occur.
NOTE 7.: If during normal use the reset button is pressed,
the gas valves close and the S4565 ignition
control starts a new sequence after releasing the
reset button.
NOTE 8.: If permanent alarm output:
neon indicator with integral resistor >150 kτ
Suffix AD and PD (see fig. 18.)
When there is a call for heat a self check period (T
waiting period (T
) elapses before the 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
T
T
c+
w
S4565 ignition control locks out.
If the flame is lost during normal run, the S4565 ignition
control repeats start sequence.
Suffix BD and QD (see fig. 19.)
As AD and PD except flame relay contact or opto is closed
after flame detection.
Suffix CD and RD (see fig. 20.)
When there is a call for heat the fan starts running through the
no air position of the air proving switch after a self check
period (T
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.
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.
If no air is proven by the air proving switch within the safety
time (T
Suffix DD and TD (see fig. 21.)
As CD and RD except flame relay contact or opto is closed
Εmax 1 mA)
after flame detection.
Gas/air application
) plus
c
For gas/air application without dynamic aircheck, the
S4565AD, BD, PD or QD can be used.
In this application the fan is connected between pin 4 and 5
and will start when a call for heat is present. The waiting
period now acts as a prepurge time.
When the call for heat disappears or when the ignition control
), the
goes in lock--out, the fan will be switched off.
s
T
T
T
c+
w
FR
Fig. 18. Functional diagram S4565AD, PD
11
) plus waiting period (T
c
), the ignition control locks out.
s
Legend
T
s
). When sufficient air flow is
w
), the
s
Thermostat
Ignition
Gas valve
Flame rod
Alarm
EN1R- -9161 0006R10- -NE

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