System Operation S4565C, D, R, T - Honeywell S4565 Production Handbook

SYSTEM OPERATION
General
Lock-out reset
The S4565C, D, R, T ignition controls can be reset by either
depressing the internal/external reset button (suffix C and D)
or by interrupting the permanent life (suffix R, and T).
If a first reset is not succesful, wait at least 15 seconds before
attempting another one.
NOTE 5.: When first starting, the ignition control can be in
the lock-out condition, depress the reset button
to free the ignition control. After a reset an
extended waiting time will occur.
NOTE 6.: 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 7.: If permanent alarm output:neon indicator with
integral resistor >150 kΩ (max 1 mA)
Suffix C and R (see Fig. 9.)
When there is a call for heat the fan starts running through
the no air position of the air proving switch.
If an external LPG valve is connected, this will be energized.
When sufficient air flow is proven by the air proving switch, a
self check period (T ) plus a prepurge period (T
c
before the gas valve and built-in ignition or external ignition
transformer (optional) are switched on.
The ignition spark ignites gas and resulting flame is detected
by the flame rod.
Internal or external ignition is switched off.
After flame establishment a predetermined, extended ignition
time can be included.
If flame is not established within the safety time (T
ignition control locks out.
If the flame is lost during normal run, the ignition control
repeats the start sequence with prepurge.
If no air is proven by the air proving switch within the
prepurge time (T ), the ignition control stays in waiting mode
p
with fan running.
EN2R-9031 0402R15-NE
Suffix D and T (see Fig. 10.)
When there is a call for heat the fan starts running through
the no air position of the air proving switch.
If an external LPG valve is connected, this will be energized.
When sufficient air flow is proven by the air proving switch, a
a self check period (T
before the pilot gas valve and built-in ignition or external
ignition transformer (optional) are switched on.
The ignition spark ignites pilot gas and resulting flame is
detected by the flame rod.
Internal or external ignition is switched off.
After flame establishment a predetermined, extended ignition
time can be included.
If flame is not established within the safety time (T
ignition control locks-out.
If the flame is lost during normal run, the ignition control
repeats start sequence at prepurge.
If no air is proven by the air proving switch within the
prepurge time (T
with fan running.
) elapse
p
), the
s
16
) plus a prepurge period (T
c
), the ignition control stays in waiting mode
p
WARNING
Do not interchange air proving switch wiring in order
to prevent malfunctioning
S4565C, D, R, T
) elapse
p
), the
s