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SERVICE & MAINTENANCE SUGGESTIONS
GENERAL: All furnaces have been fire-tested to check for proper
operation.
This includes, main burner flame, pilot flame, fan
operation, fan control, limit control and automatic valve operation.
If the furnace fails to function on initial installation, it is advisable to
re-check the following:
1.
115 volts to the junction box.
2.
Inlet gas pressure.
3.
The 24 volt system.
4.
Type of gas being used and that shown on the rating label.
Servicing the Pilot and Main Burners, Pilot Orifice, and Main
Burner Orifices: Disconnect the gas supply at the inlet to the
control valve. Then remove the burner door to which the above
components are attached.
Servicing The Fan Motor: The upper front panel, the shroud
surrounding the fan blade and fan blade must be removed.
Replacing Fan and Oiling the Motor
The fan motor should be cleaned and oiled once each heating season.
To reach the motor, withdraw the metal shroud surrounding the fan
blade by removing the screws on each side. Oil holes are located
on the top at each end of the motor. Use a few drops of #10 motor
oil. To clean the motor, blow air through its ventilation openings
with a vacuum cleaner or low pressure air source.
If fan motor is replaced, the silicone rubber gaskets, see Page 20,
Index No. 4, Part No. M147, should also be replaced. The gaskets
must be stretched to fit the motor bolts into the gasket holes and
then the motor and gaskets installed on the motor mounting bars.
S8600H INTERMITTENT IGNITION MODULE SPECIFICATIONS
Lockout timing is 90 seconds. Ignition timing is until pilot lights or
lockout occurs.
Module shuts down and cuts power to gas control on flame failure.
Gas control closes to provide 100 percent lockout on flame failure.
Manual reset required.
ELECTRICAL RATINGS:
Voltage and frequency: 20.5 to 28.5V (24V nom.) 60 Hz.
Current rating: 0.2 A.
Valve contact ratings (at 24 Vac):
Run
Inrush
Pilot
1.0 A
10.0 A
Main 1.0 A
10.0 A
SPARK GENERATOR OUTPUT: 13kV peak at 25 pf load.
ANTICIPATOR SETTING: 0.2 A plus pilot valve rating plus main
valve rating.
COMPATIBILITY: Standard models compatible with all open-close
switch type 24 Vac capable of supplying rated voltage and current
to the module.
AMBIENT TEMPERATURE RATING: Minus 40 F to plus 175 F
(minus 40 C to plus 79 C).
RELATIVE HUMIDITY RATING: 5 to 90 percent RH at 95 F.
FLAME FAILURE RESPONSE TIME: 0.8 seconds at 1.0 uA flame
current.
FLAME CURRENT: 1 uA, min.
Page 16
CHECKOUT
Check out the gas control system:
1. At initial installation of the appliance.
2. As part of regular maintenance procedures.
3. As the first step in troubleshooting.
4. Any time work is done on the system.
STEP 1: Perform Visual Inspection.
A. With power off, make sure all wiring connections are clean and
tight.
B. Turn on power to appliance and ignition module.
C. Open manual shutoff valves in the gas line to the appliance.
D. Do gas leak test ahead of gas control if piping has been disturbed.
GAS LEAK TEST: Paint pipe joints with rich soap and water
solution. Bubbles indicate gas leak. Tighten joints to stop leak.
STEP 2:
Review Normal Operating Sequence and Module
Specifications.
STEP 3: Reset the Module.
A. Turn the control valve to off.
B. Wait one minute.
As you do Steps 4 and 5, watch for points where operation
deviates from normal. Refer to Troubleshooting Chart to correct
problem.
STEP 4: Check Safety Lockout Operation.
A. Turn gas supply off.
B. Watch for spark at pilot burner.
C. Time length of spark operation. Maximum spark time is 90
seconds.
D. Open manual gas cock and make sure no gas is flowing to pilot
or main burner.
E. Wait one minute before continuing.
STEP 5: Check Normal Operation.
A. Turn contol valve on to call for heat.
B. Make sure pilot lights smoothly when gas reaches the pilot
burner.
C. Make sure main burner lights smoothly without flashback. Make
sure burner operates smoothly without floating or lifting.
D. 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.
E. Turn control valve off. Make sure main burner and pilot flames
go out.
OPERATION
Module operation can be conveniently divided into two phases for
S8600H. The phases are trial for ignition and main burner operation.
37403-5-0620
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