Honeywell S8600B - Operation; Prepurge; S8600, S8610 Normal Operating Sequence

12
44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม. 10170.
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call for heat.
❏ Make sure pilot lights smoothly when gas reaches the
pilot burner.
❏ Make sure main burner lights smoothly without flash-
back.
❏ Make sure burner operates smoothly without floating,
lifting, or flame rollout to the furnace vestibule or heat
buildup in the vestibule.
OPERATION
Module operation can be conveniently divided into two
phases for S8600, S8610 and three for S8660, S8670. The
phases are
• Prepurge (S8660, S8670 only)
• Trial for ignition (all models)
• Main burner operation (all models)
Figs. 11 and 12 summarize the normal operating se-
quences of the modules.
❏ If gas line has been disturbed, complete gas leak test.
GAS LEAK TEST: Paint gas control gasket edges and all
pipe connections downstream of gas control, including pilot
tubing connections, with rich soap and water solution.
Bubbles indicate gas leaks. Tighten joints and screws or
replace component to stop gas leak. Recheck with soap
and water.
❏ Turn thermostat or controller below room temperature.
Make sure main burner and pilot flames go out.
PREPURGE (S8660,S8670 ONLY)
When the S8660 is used in a fan-assisted combustion
system, the combustion air blower starts on a call for heat.
On proof of airflow, the air proving switch closes and
energizes the S8660, S8670. When the module is used in
an atmospheric system, the call for heat energizes the
module.
In either case, the module first initiates a 45 sec. delay
to allow system prepurge. After prepurge, the module starts
the pilot ignition sequence.
START
STAGE 1
TRIAL FOR
IGNIITION
3
Pilot burner lights.
Module senses
flame current.
PILOT BURNER OPERATION
Pilot burner does not light.
OR
Module Response
S8600A,F
S8610A,F
Ignition spark continues, pilot
valve remains open until system
is reset
S8600B,H
S8610B,H
After 15 or 90 sec
a
system
locks out; must be
manually reset.
S8600M
After 90 sec.
a
system shuts off;
after 5 minutes min. (6 minutes
nom.), module restarts trial for
ignition; ignition trial, shutoff, wait
sequence repeats until pilot lights
or call for heat ends.
a
Shutoff/lockout timing is stamped on module
STAGE 2
MAIN BURNER
OPERATION
END
POWER INTERRUPTION
System shuts off, restarts when power is
restored.
PILOT FLAME FAILURE
Main valve closes.
Module starts trial for ignition.
M1172B
Fig. 11—S8600, S8610 normal operating sequence.
6 THERMOSTAT (CONTROLLER)
SATISFIED
Valves close, pilot and main
burners are off.
5
MAIN BURNER OPERATION
Module monitors pilot flame
current.
4
FLAME CURRENT SENSED
Spark generator off.
Second valve operator (main)
opens.
2
SPARK GENERATOR POWERED
First valve (pilot) operator opens
1
1
THERMOSTAT (CONTROLLER)
CALLS FOR HEAT