Vermont Casting 3930, SDVR, PDV20: 3920, 4075 Troubleshooting / Honeywell #8420 Gas Control System

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Pinnacle & Stardance Direct Vent - Rear Vent Gas Heaters

Troubleshooting / Honeywell #8420 Gas Control System

NOTE: Before troubleshooting the gas control system, be sure the external gas shutoff is in the “ON” position.

WARNING: REMOVE THE GLASS PANEL BEFORE PERFORMING ANY GAS CONTROL SERVICE WORK.

SYMPTOM

POSSIBLE CAUSES

CORRECTIVE ACTION

 

1.

Spark ignitor will

A. Defective or misaligned

Using a match, light pilot. If pilot lights, turn off pilot and

 

 

 

not light

electrode at the pilot

push the ignitor button again. If pilot will not light, check

 

 

 

 

 

 

gap at electrode and pilot - it should be 1/8” to have a

 

 

 

 

 

 

strong spark.

 

 

 

 

 

 

 

 

 

 

 

 

 

B. Defective ignitor (push

Push piezo ignitor button. Check for spark at electrode

 

 

 

 

 

button)

and pilot. If there is no spark at the pilot, and electrode

 

 

 

 

 

 

wire is properly connected, replace ignitor.

 

 

 

 

 

 

 

 

 

 

2.

Pilot will not stay lit

A. Defective pilot generator

Check pilot flame. It must impinge on the thermocouple

 

 

 

after carefully

(thermocouple)

or thermopile. NOTE: This pilot burner assembly uses

 

 

 

following the

 

both a thermocouple and a thermopile. The thermo-

 

 

 

lighting instructions

 

couple operates the pilot flame. Tighten the thermo-

 

 

 

 

 

 

couple. The thermopile operates the main valve (ON and

 

 

 

 

 

 

OFF). Clean and/or adjust pilot for maximum flame

 

 

 

 

 

 

impingement on thermocouple and thermopile.

 

 

 

 

 

 

 

 

 

 

 

 

 

B. Defective automatic valve

Turn valve knob to ‘Pilot’. Maintain flow to pilot; millivolt

 

 

 

 

 

operator

meter should read greater than 10mV. If the reading is

 

 

 

 

 

 

okay and the pilot does not stay on, replace the gas

 

 

 

 

 

 

valve. NOTE: An interrupter block (not supplied) must be

 

 

 

 

 

 

used to conduct this test.

 

 

 

 

 

 

 

 

 

 

 

 

 

A. Remote switch or wires

Check rocker switch and wires for proper connection.

 

 

3.

Pilot lights, no gas

defective

Use jumper wires across terminals at rocker switch. If

 

 

 

to burner, valve

 

burner lights, replace rocker switch. If okay, use jumper

 

 

 

knob ON, remote

 

wires across rocker switch wires at the valve; if burner

 

 

 

switch (rocker

 

lights, wires are faulty or connections are bad.

 

 

 

switch) ON

 

 

 

 

 

 

B. Thermopile may not gener-

1. Be sure wire connections from thermopile at gas valve

 

 

 

 

 

 

 

 

 

 

ate sufficient voltage

terminals are tight and thermopile is fully inserted into

 

 

 

 

 

 

pilot bracket.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. One of the rocker switch wires may be grounded.

 

 

 

 

 

 

Remove rocker switch wires from valve terminals. If

 

 

 

 

 

 

burner now stays lit, trace rocker switch wiring from

 

 

 

 

 

 

ground. It may be grounded to the appliance or the

 

 

 

 

 

 

gas supply line.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. Check the thermopile with a millivolt meter. Take

 

 

 

 

 

 

reading at thermopile (“TP” and “TP/TH”) terminals of

 

 

 

 

gas valve. Should read 325 millivolts minimum while

 

 

 

 

holding valve knob depressed in PILOT position and

 

 

 

 

with rocker switch OFF. Replace faulty thermopile if

 

 

 

 

reading is below specified minimum.

 

 

 

 

 

 

 

 

 

C. Plugged burner orifice

Check burner orifices for debris, and remove.

 

 

 

 

D. Defective automatic valve

Turn knob to ON, place rocker switch to ON, millivolt

 

 

 

operator

meter should read greater than 10 mV. If the reading is

 

 

 

 

okay and the burner does not light, replace the valve.

 

 

 

 

 

 

4. Frequent pilot

A. Pilot flame may be too low

Clean and/or adjust pilot flame for maximum flame

 

outage

or high, (blowing or lifting),

impingement on thermocouple and thermopile.

 

 

 

causing the pilot to drop out

 

 

 

 

 

 

 

B. Possible blockage of the

Check the vent terminal for blockage.

 

 

 

vent terminal

 

 

 

 

 

 

 

 

 

 

 

 

20007066

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Contents Pinnacle & Stardance Direct Vent, Rear Vent Gas Heater Table of Contents Installation & Operating Instructions Stove Dimensions Stardance Direct Vent Gas Heater Stove Dimensions Pinnacle Direct Vent Gas HeaterMinimum Clearances to Combustible Materials Clearance RequirementsMantel Clearances Hearth Requirements Gas SpecificationsGas Inlet and Manifold Pressures Input Model Fuel Gas Control BTU/hHorizontal Termination High ElevationsVent Termination Clearances Vertical TerminationLocation of Vent Termination General Venting Information Termination Location Canadian Installations1 US Installations2Termination Clearances Vent Components Install Optional Fan Kit #2960/FK28 InstallationFan Kit Contents Unpack the StoveFor U.S. installations The venting system must Venting System Assembly Direct VentFor Canadian installations The venting system must General InformationThrough Side Wall Vent Termination Below Grade PDV20 with Rear Vent Kit 7TFSRSK installationInstall inner starter pipe and inner elbow Side Wall Termination AssemblyDetermine the vertical pipe length ³⁄₈ x 9³⁄₈ 240 x 240mm Vertical Through the Roof Vent AssemblyFireplace Vent Termination Clearances Vertical Through Existing ChimneyFireplace Vent System Fireplace Installation Requirements PDV20 Fireplace Installation Requirements Sdvr Install ON/OFF Switch R Models only Complete the AssemblyConnect the Gas Supply Line Burner InformationThis completes assembly of the PDV20 and Sdvr stove Install the Front PlateThermostat Connection Use only a thermostat rated for 500 750 millivoltsLogs Install the Log SetFlame Characteristics Flame & Temperature AdjustmentOperation Your First FireCorrect pilot flame pattern. PSE Pilot What to do if YOU Smell GAS Lighting And Operating InstructionsTo Turn Off Gas To Heater Symptom Possible Causes Corrective Action Troubleshooting / Honeywell #8420 Gas Control SystemTransmitter Operation Off Mode Shut Off ProcedureOn Manual Mode Delay Timer ModeFan Override During Auto Mode Auto ModeChange Between F/C Temperature Units Disable Thermostat FunctionLocal Path Conversion Procedure Conversion PrecautionsAuto Path Fuel Conversion InstructionsPilot Type Models 3920, 3930, 4065, 4070 R Models OnlyAll Models Models 3960, 3970, 4075, 4080 RF Models OnlyConversion to Natural Gas Input BTU/h Conversion to LP Input BTU/hMaintenance Check the Gas Flame Regularly Gasket ReplacementInspect the Vent System Annually Wiring Diagrams Stove DisassemblyPinnacle PDV20 / Stardance Sdvr Direct Vent/Rear Vent PDV20 Sdvr DescriptionFuel Conversion Kits Remote Controls Optional AccessoriesFan Kits Screen KitIf Warranty Service is NEEDED… Product Covered by this WarrantyCFM Specialty Home Products

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