DVS 30-2 DVS-36& DVS-42INTERMITTENT PILOT TROUBLESHOOTING, Specifications, Operation, Checkout

DVS-36 & DVS-42 INTERMITTENT PILOT TROUBLESHOOTING

		CALL SERVICEMAN
GENERAL: All furnaces have been fire-tested to check for			STEP 1: Perform Visual Inspection.
proper operation.		This includes, main burner flame, pilot	A. With power off, make sure all wiring connections are
flame, fan operation, fan control, limit control and automatic			clean and tight.
			B. Turn on power to appliance and ignition module.
valve operation.		If the furnace fails to function on initial
			C. Open manual shutoff valves in the gas line to the appli-
installation, it is advisab\le to re-check the following:
			ance.
1.	115 volts to the junction box.
			D. Do gas leak test ahead of gas control if piping has been
2.	Inlet gas pressure.
			disturbed.
3.	The 24 volt system.
			GAS LEAK TEST: Paint pipe joints with rich soap and
4. Type of gas being used and that shown on the rating
			water solution. Bubbles indicate gas leak. Tighten joints
	label.
			to stop leak.
The Service Department at Empire Comfort Systems, Inc. may			STEP 2: Review Normal Operating Sequence and Module
be contacted to assist in servicing furnace.
			Specifications.
Servicing the Pilot and Main Burners, Pilot Orifice, and			STEP 3: Reset the Module.
Main Burner Orifices: Disconnect the gas supply at the inlet
			A. Turn the thermostat to its lowest setting.
to the control valve. Then remove the burner door to which the			B. Wait one minute.
above components are attached.			As you do Steps 4 and 5, watch for points where operation
Servicing The Fan Motor: The upper front panel, the shroud			deviates from normal. Refer to Troubleshooting Chart to
surrounding the fan blade and fan blade must be removed. See			correct problem.
"Oiling the Motor" paragraph on page 8.			STEP 4: Check Safety Lockout Operation.
S 8 6 0 0 H I N T E R M I T T E N T I G N I T I O N M O D U L E			A. Turn gas supply off.
			B. Set thermostat above room temperature to call for heat.
SPECIFICATIONS
			C. Watch for spark at pilot burner.
Lockout timing is 90 seconds. Ignition timing is until pilot
			D. Time length of spark operation. Maximum spark time is
lights or lockout occurs.
			90 seconds.
Module shuts down and cuts power to gas control on flame			E. Open manual gas cock and make sure no gas is flowing to
failure. Gas control closes to provide 100 percent lockout on			pilot or main burner.
flame failure. Manual reset required.			F. Set thermostat below room temperature and wait one
ELECTRICAL RATINGS:			minute before continuing.
			STEP 5: Check Normal Operation.
Voltage and frequency: 20.5 to 28.5V (24V nom.) 60 Hz.
			A. Set thermostat above room temperature to call for heat.
Current rating:		0.2 A.
			B. Make sure pilot lights smoothly when gas reaches the pilot
Valve contact ratings (at 24 Vac):
			burner.
	Run	Inrush
			C. Make sure main burner lights smoothly without flash-
	Pilot 1.0 A	10.0 A
			back. Make sure burner operates smoothly without float-
	Main 1.0 A	10.0 A
			ing or lifting.
SPARK GENERATOR OUTPUT: 13kV peak at 25 pf load.
			D. If gas line has been disturbed, complete gas leak test.
THERMOSTAT ANTICIPATOR SETTING: 0.2 A plus pilot
			GAS LEAK TEST: Paint gas control gasket edges and all
valve rating plus main valve rating.
			pipe connections downstream of gas control, including
THERMOSTAT COMPATIBILITY: Standard models com-
			pilot tubing connections, with rich soap and water solu-
patible with all open-close switch type 24 Vac thermostats			tion. Bubbles indicate gas leaks. Tighten joints and
capable of supplying rated voltage and current to the mod-			screws or replace component to stop gas leak.
ule.			E. Turn thermostat below room temperature. Make sure
AMBIENT TEMPERATURE RATING: Minus 40 F to plus			main burner and pilot flames go out.
175 F (minus 40 C to plus 79 C).			OPERATION
RELATIVE HUMIDITY RATING: 5 to 90 percent RH at 95			Module operation can be conveniently divided into two phases
F.			for S8600H. The phases are trial for ignition and main burner
FLAME FAILURE RESPONSE TIME: 0.8 seconds at 1.0 uA			operation.
flame current.			TRIAL FOR IGNITION
FLAME CURRENT: 1 uA, min.			Pilot Ignition
CHECKOUT			Following call for heat (system start on S8600H), the module
Check out the gas control system:			energizes the first main valve operator. The first main valve
1. At initial installation of the appliance.			opens, which allows gas to flow to the pilot burner. At the

2.	As part of regular maintenance procedures.	same time, the electronic spark generator in the module pro-
		duces a 13,000 volt spark pulse output (at 25 pf load). The
3.	As the first step in troubleshooting.
		voltage generates a spark at the igniter-sensor that lights the
4.	Any time work is done on the system.
		pilot.

13369-1-0203 Page 33