
S8600B,C,H,M;S8610B,C,H,M;S8670D,E,J,KINTERMITTENTPILOT GASIGNITIONCONTROL
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ADD FURNACE CO.,LTD.
44 ซอยบรมราชชนนี 70 ถนนบรมราชชนนี แขวงศาลาธรรมสพน์ เขตทวีวัฒนา กรุงเทพฯ 10170
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https://www.add-furnace.com E-mail: sales@add-furnace.com
IMPORTANT
1.
The following service procedures are provided
as a general guide. Follow appliance manufac-
turer’s service instructionsifavailable.
2.
Meterreadings betweenthe gas control andigni-
tion control must be taken within the trial for igni-
tion period. Once the ignition control shuts off,
lockout models must be reset by setting the ther-
mostat down for at least 30seconds before con-
tinuing. Onretry models, wait for retry or reset at
thethermostat.
3.
If anycomponent does not function properly,
make sure it is correctly installed and wired
before replacingit.
4.
The ignition module cannot be repaired. Ifit mal-
functions,it must bereplaced.
5.
Onlytrained,experienced service technicians
shouldserviceintermittentpilotsystems.
6.
After troubleshooting, check out thesystem
again to be sure itis operating normally.
General troubleshooting process is as follows:
1.
Refer to “LED Status and Troubleshooting” on
page 12for LED status codes.
2.
Perform the “Checkout” on page 7 as the first step
introubleshooting.
3.
Check the troubleshooting guide (Fig. 14) to pin-
point the cause of the problem.
4.
If troubleshooting indicates an ignition problem, see
Ignition System Checks below to isolate and correct
theproblem.
5.
Following troubleshooting, perform the “Checkout”
on page 7 again to be sure system is operating nor-
mally.
Ignition System Checks
Step 1: Check ignition cable.
Make sure:
•
Ignition cable does not run in contact with any metal
surfaces.
•
Ignition cable is no more than 36 in. (0.9 m) long.
•
Connections to the ignition module and tothe igniteror
igniter-sensor areclean andtight.
•
Ignitioncableprovidesgoodelectricalcontinuity.
STEP 2: Check ignition system
grounding. Nuisance shutdowns are
often caused by a poor or erratic
ground.
A common ground is required for the module and the pilot
burnerbracket.
•
Check the ground circuit 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 14- to 18-gauge,
moisture-resistant,thermoplasticinsulatedwire
with 221°F (105°C) minimum rating.
—If the flame rod or bracket is 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.
•
Close the manual gas valve.
•
DisconnecttheignitioncableattheSPARKterminalon
themodule.
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or property damage.
When performing the following steps, do not touch
the stripped end of jumper or SPARK terminal.
The ignition circuit generates over 10,000 volts
and electrical shock can result.
•
Energize the module and immediately touch one end
of the jumper firmly to the GND terminal on the
module. Movethe free end ofthejumper slowlytoward
the SPARK terminal until a spark is established.
•
Pullthe jumper slowly away fromtheterminal andnote
the length of the gap when sparking stops. Check
Table 5below.
Table 5. Arc Troubleshooting.
No arc or arc less
than 1/8 in. (3 mm)
Check external fuse, if provided.
Verify power at the module’s input
terminal.Replacecontroliffuseand
power areokay.
Arc 1/8 in.(3 mm)
or longer
STEP 4: Check pilot and main burner
lightoff.
•
Set the thermostat to “Call for Heat.”
•
Watch the pilot burner during the ignition sequence.
See if:
•
Ignition spark continues after the pilot is lit.
•
The pilot lights and the spark stops, but main
burner does notlight.
•
S8600 B,H; S8610 B,H; S8670 D,J only: The
pilot lights, the spark stops and main burner
lights, but the system shuts down.
•
Ifso, ensure adequate flame current as follows.
•
Turn off appliance power atcircuit breaker or
fusebox.
•
Clean the flame rod with emery cloth.
•
Makesureelectricalconnections areclean and
tight. Replace damaged wire with moisture-
resistant No. 18 wire rated for continuous duty
up to 221°F(105°C).
•
Checkforcrackedceramicinsulator,whichcan
cause short to ground, and replace igniter-
sensorifnecessary.
•
Atthe gas control, disconnect main valve wire
from the MVterminal.
•
Turn on power and set thermostat to call for
heat. The pilot should light but the main burner
willremain offbecause themainvalve actuator
isdisconnected.
•
Check the pilot flame. Make sure it is blue,
steady and envelops 3/8 to 1/2 in. (10 to 13
mm) of the flame rod. See Fig. 11 for possible
flame problems and their causes.