Operation; Troubleshooting; Ignition System Checks - Honeywell S8610U Installation Instructions Manual

OPERATION

Module operation can be conveniently divided into two
phases for the S8610:
• Trial for ignition.
• Main burner operation.
Fig. 5 summarizes the normal module operating se­
quence.

TROUBLESHOOTING

IMPORTANT
1 . T h e fo llo w in g s e rv ic e p ro ce d u re s a re p ro vid e d a s
a g e n e ra l g u id e . F o llo w a p p lia n c e m a n u fa ctu re r
s e rv ic e in s tru c tio n s if a v a ila b le .
2 . M e te r re a d in g s b e tw e e n g a s co n tro l a n d ig n itio n
m o d u le m u st b e ta k e n w ith in th e tria l fo r ig n itio n
p e rio d . O n c e th e ig n itio n m o d u le sh u ts o ff, w a it
fo r re try o r re se t a t th e th e rm o sta t
3 . If a n y c o m p o n e n t d o e s n o t fu n ctio n p ro p e rly ,
m a k e s u re it is c o rre ctly in sta lle d a n d w ire d
b e fo re re p la c in g it.
4 . T h e ig n itio n m o d u le c a n n o t b e re p a ire d . If it
m a lfu n c tio n s , re p la ce it
5 . O n ly tra in e d , e xp e rie n ce d se rvice te c h n ic ia n s
sh o u ld s e rv ic e in te rm itte n t p ilo t s y s te m s .
6 . A fte r s e rv ic in g , ve rify p ro p e r syste m o p e ra tio n .
Perform the checkout step in the Startup and Checkout
section as the first step in troubleshooting. Then check the
Troubleshooting Guide (Fig. 7) and the schematic diagram
(Fig. 8) to determine the exact cause of the problem. If
troubleshooting indicates an ignition problem, see Ignition
System Checks section to isolate and correct the problem.
After troubleshooting, perform the checkout procedures
again to be sure system is operating normally.

Ignition System Checks

Step 1: Check ignition cable.
Make sure:
a. Ignition cable does not run in contact with any metal
surfaces.
b. Ignition cable is no more than 36 in. (0.9m) long.
c. Connections to the ignition module and to the igniter
or igniter-sensor are clean and tight.
d. Ignition cable provides good electrical continuity.
S8610U UNIVERSAL INTERM ITTENT P H O T MODULE
Step 2: Check ignition system grounding. Nui­
sance shutdowns are often caused by a poor or
erratic ground.
a. A common ground, usually supplied by the pilot
burner bracket, is required for the module and the
pilot burner/igniter-sensor.
• Check for good metal-to-metal contact between
the pilot burner bracket and the main burner.
• Check the ground lead from the GND (BURNER)
terminal on the module to the pilot burner. Make
sure connections are clean and tight. If the wire is
damaged or deteriorated, replace it with No. 14
through 18 gauge, moisture-resistant, therm o­
plastic insulated wire with 105°C (221°F) mini­
mum rating.
— Check the ceramic flame rod insulator for
cracks or evidence of exposure to extreme
heat, which can permit leakage to ground.
Replace pilot burner/igniter-sensor and
provide shield, if necessary.
— If flame rod or bracket are bent out of position,
restore to correct position.
Step 3: Check spark ignition circuit. You will need
a short jumper wire made from ignition cable or
other heavily insulated wire.
a. Close the manual gas valve.
b. Disconnect the ignition cable at the SPARK terminal
on the module.
A WARNING
ELECTROCUTION HAZARD
CAN CAUSE SERIOUS INJURY
OR DEATH.
When performing the following steps, do not touch
stripped end of jumper or SPARK terminal. The
ignition circuit generates over 10,000 volts and
electrical shock can result.
c. Energize the module and im m ediately touch one
end of the jum per firm ly to the GND terminal on the
module. Move the free end of the jum per slowly
toward the SPARK terminal until a spark is estab­
lished.
d. Pull the jumper slowly away from the terminal and
note the length of the gap when sparking stops, check
as follows:
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