Honeywell S286; Lighting And Shutdown Instructions; Operation; First Stage - Trial For Pilot Ignition - Garland G56PT Installation And Operator's Manual

INTERMITTENT PILOT INSTRUCTIONS - HONEYWELL S286

Lighting and Shutdown Instructions

Starting Burner
1 . Turn the gas valve control knob to "OFF" wait five
minutes .
2 . Turn gas valve control knob to "ON" .
3 . Turn power switch to "ON", fan will turn on .
4 . Turn thermostat to desired temperature setting .
5 . If the burner does not light, turn the thermostat to "OFF"
and wait five minutes then repeat step (4) .
Shutting Burner Down
1 . Turn thermostat to "OFF" .
2 . Turn power switch to "OFF" .
3 . Turn gas valve control knob to "OFF" .
4 . Turn main shutoff valve to "OFF" .

Operation

First Stage – Trial for Pilot Ignition
On every call for heat (system start), the S86 performs an
internal safe-start check shows that a flame-simulating
condition is present .
During a normal start, the S86 opens the first operator in
the gas control . This allows gas to flow to the pilot burner .
Simultaneously, the electronic spark generator in the S86
produces a 30,000 volt spark pulse output . This voltage
produces a spark at the pilot burner ignitor/sensor rod,
igniting the gas flowing around the electrode . If the pilot
flame is not detected during the trial for pilot ignition, the
S86A and B will continue trying for pilot ignition until a flame
is established . The S86C and D contain a safety lockout timer
to limit the trial for pilot ignition period .
Second Stage – Main Burner Operation
When the pilot flame is established, a flame rectification
circuit is completed to the burner ground . The S86 flame
sending circuit detects the flame current and shuts the
spark generator off . At the same time the second operator
(main) is opened in the gas control, allowing fast flow to
the main burner . The pilot flame ignites the main burner
conventionally . On the S86C and D the flame current also
holds the safety lockout timer in the reset, or normal,
operating condition .
Part # 1382670 (12/07)
Safety Lockout Time (S86 & S86D Only)
The safety lockout timer circuit starts timing the moment
the trial for pilot ignition starts . When the timing period runs
out, the trial for ignition ends, and the control module goes
into lockout . Before another attempt to start can be made
the S86 must be reset . Reset by adjusting the thermostat or
controller below room temperature, or to its "OFF" position .
An alternate method is to shut the system power "OFF" . If
normal ignition does not occur, use the trouble shooting
table to determine the problem .

Service

Preliminary Check

The following visual checks should be made before trouble
shooting and after installation of maintenance .
1 . Check power to appliance and S86
2 . Manual shutoff cocks in gas line to appliance must be
open .
3 . Make certain all wiring connections are clean and tight .
4 . S86C & D module must not be in safety lockout . First de-
energize the system and wait at least one (1) minute . This
resets the module allowing a return to start condition .
Then energize the system .
5 . Review the S86 system normal sequence of operation .

S86 Checkout And Trouble Shooting

NOTE: On servicing S86A, B, C and D models .
The S86E, F, G and H models can be used to directly replace
S86A, B, C and D models (E replaces A model, F replaces B, G
replaces C model and H replaces D model) and the S86B and D
can be used to replace S86F and H, respectively . However, the
S86A and C cannot be used to replace the S86E and G module
on IPI systems that use VR8520 gas controls . VR8440 or VR8520
valves will not function properly with the S86A or C .

Check Grounding

A common ground is required for the pilot burner, the
ignitor-sensor, the GND terminal of the S86, and the main
burner . The main burner generally serves as the common
ground . If the ground is poor or erratic, safety shutdowns
may occur occasionally even though operation is normal at
the time of the checkout . Therefore, if nuisance shutdowns
have been reported, be sure to check the grounding .
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