Honeywell S8600B Installation Instructions Manual page 9

Intermittent pilot gas ignition control
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S8600B,C,H,M; S8610B,C,H,M; S8670D,E,J,K INTERMITTENT PILOT GAS IGNITION CONTROL
OPERATING SEQUENCE - STANDARD MODELS
S8600 C, M; S8610 C, M = RETRY
S8600 B, H; S8610 B, H = LOCKOUT
IDLE
(NOT POWERED)
"CALL
FOR
HEAT"
RECEIVED FROM
THERMOSTAT
POWER TO
MODULE AND
SELF CHECK
A
TRIAL FOR
IGNITION
SPARK ON
(TIMER STARTED)
FLAME
CLOSE PILOT
NO
PROVED?
GAS VALVE
(BEFORE TRIAL FOR IGNITION TIMER EXPIRES)
YES
SPARK OFF
OPEN MAIN GAS
VALVE
FLAME
STABILIZATION
(2 SECONDS)
"CALL
OR HEAT"
RUN
F
ENDS?
YES
CLOSE MAIN GAS
VALVE AND
PILOT GAS
VALVE
Fig. 9. Normal Operating Sequence for Standard Models.
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OPEN PILOT GAS
VALVE
SPARK OFF
NO
CLOSE MAIN GAS
FLAME YES
NO
VALVE AND
LOST?
PILOT GAS
VALVE
9
WAIT FOR
"CALL FOR HEAT"
TO BE REMOVED
ACTIVATE ALARM
CONTACT(S)
(OPTIONAL)
RETRY DELAY
(5 MINUTES)
RETRY
RETRY OR
LOCKOUT
LOCKOUT
MODEL?
A
M29905
69-1954—01

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