Honeywell S8600H - Troubleshooting

69-1954—01
10
S8600B,C,H,M; S8610B,C,H,M; S8670D,E,J,K INTERMITTENT PILOT GAS IGNITION CONTROL
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OPERATING SEQUENCE - PREPURGE MODELS
S8760 E, K = RETRY
S8670 D, J = LOCKOUT
Fig. 10. Normal Operating Sequence for Prepurge Models.
TROUBLESHOOTING
WARNING
Fire, Explosion, or Electrical Shock Hazard.
Can cause severe injury, death or property damage.
Do not attempt to modify the physical or electrical
characteristics of this device in any way. Replace
it if troubleshooting indicates a malfunction.
A
PREPURGE
(30 SECONDS)
RETRY
FLAME
PROVED?
NO
RETRY OR
LOCKOUT
LOCKOUT
MODEL?
(BEFORE TRIAL FOR IGNITION TIMER EXPIRES)
YES
SPARK OFF
OPEN MAIN GAS
VALVE
NO
“CALL
FOR HEAT” NO
ENDS?
FLAME
LOST?
YES
A
YES
M29906
IDLE
(NOT POWERED)
“CALL FOR
HEAT”
RECEIVED FROM
THERMOSTAT
POWER TO
MODULE AND
SELF CHECK
TRIAL FOR
IGNITION
(TIMER STARTED)
FLAME
STABILIZATION
(2 SECONDS)
RUN
CLOSE MAIN GAS
VALVE AND
PILOT GAS
VALVE
WAIT FOR
“CALL FOR HEAT”
TO BE REMOVED
ACTIVATE ALARM
CONTACT(S)
(OPTIONAL)
RETRY DELAY
(5 MINUTES)
SPARK ON
OPEN PILOT GAS
VALVE
CLOSE PILOT
GAS VALVE
SPARK OFF
CLOSE MAIN GAS
VALVE AND
PILOT GAS
VALVE