EN2R-9031 0402R15-NE
22
SYSTEM OPERATION
S4565AD, BD, CD, DD, PD, QD, RD, TD “1000” SERIES
General
The S4565AD, BD, CD, DD, PD, QD, RD, TD ignition controls
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 tap has to
be grounded.
Lock out reset
The ignition control 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).
If a first reset is not succesful, wait at least 15 seconds before
attempting another one.
NOTE 8.:
When first starting, the ignition control can be in
the lock-out condition; reset the ignition control.
after a reset an extended waiting time will occur.
NOTE 9.:
If during normal use the reset button is pressed,
the gas valves close and the ignition control
starts a new sequence after releasing the reset
button.
NOTE 10.: If permanent alarm output: neon indicator with
integral resistor >150 k
Ω (
max 1 mA)
Suffix AD and PD (see Fig. 20.)
When there is a call for heat a self check period (T
c
) plus
waiting period (T
w
) elapse 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
gnition control locks out.
If the flame is lost during normal run, the ignition control
repeats start sequence.
Suffix BD and QD (see Fig. 21.)
As AD and PD except flame relay contact or opto is closed
after flame detection.
Suffix CD and RD (see Fig. 22. )
When there is a call for heat the fan starts running through
the no air position of the air proving switch after 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
ignition control locks out.
If the flame is lost during normal run, the 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. 23.)
As CD and RD except flame relay or opto is closed after
flame detection.
Gas/air application
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 5 and 6
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.
*
The safety time starts after the fan is switched on.
