System Operation S4565A, B, P, Q - Honeywell S4565 Production Handbook

SYSTEM OPERATION
General
Lock-out reset
The S4565A, B, P and Q ignition controls can be reset by
either depressing the internal/external reset button (suffix A
and B) or by interrupting the permanent live connection
(suffix P and Q).
If a first reset is not succesful, wait at least 15 seconds before
attempting another one.
NOTE 1.: When first starting, the ignition control can be in
the lock-out condition; depress the reset button
to free the ignition control. After a manual reset
an extended prepurge/waiting time will occur.
NOTE 2.: If during normal use the reset button is pressed,
the gas valves drop out and the ignition control
starts a new sequence after releasing the reset
button.
NOTE 3.: If permanent alarm output: neon indicator with
integral resistor >150 kΩ (max 1 mA)
NOTE 4.: If an automatic return high limit thermostat is
used, the high limit switch in the application
needs a longer return time than the trial for igni-
tion time of the ignition control. This in order to
provide non volatile lock out.
EN2R-9031 0402R15-NE
Suffix A, B, P and Q (see Fig. 7.)
When there is a call for heat a self check period (Tc) plus
waiting period (T ) elapse before built-in igniter and gas valve
w
are switched on.
The ignition spark ignites gas and resulting flame is detected
by the flame rod.
Ignition is switched off after extended ignition time and flame
establishment.
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.
12
S4565A, B, P, Q
), the
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