11
EN1R--9161 0006R10--NE
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
Εmax 1 mA)
Suffix AD and PD (see fig. 18.)
When there is a call for heat a self check period (T
c
)plus
waiting period (T
w
) elapses before 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
s
), the
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
c
) plus waiting period (T
w
). 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.
After flame establishment a predetermined, extended ignition
time can be included.
If flame is not established within the safety time (T
s
), the
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
s
), the ignition control locks out.
Suffix DD and TD (see fig. 21.)
As CD and RD except flame relay contact or opto is closed
after flame detection.
Gas/air app lication
For gas/air application without dynamic aircheck, the
S4565AD, BD, PD or QD c an 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
goes in lock --out, the fan will be switched off.
T
c+
T
w
T
s
Thermostat
Alarm
Ignition
Gas valve
Flame rod
Legend
T
c+
T
w
T
FR
Fig. 18. Functional diagram S4565AD, PD
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