Troubleshooting - Vermont Castings SDDVTCBSB Installation & Operating Manual

TROUBLESHOOTING THE GAS CONTROL SYSTEM (SDDVT SERIES)
NOTE: Before trouble shooting the gas control system, be sure external gas shut off is in the "On" position.
Symptom
Spark Ignitor will not 1. Defective or misaligned
light electrode at pilot
2. Defective ignitor (push
button)
Pilot will not stay 1. Defective pilot generator
lit after carefully (thermocouple), remote
following lighting wall switch
instructions
2. Defective automatic valve
Pilot burning, no 1. Wall switch or wires
gas to main burner defective
2. Thermopile may not be
generating sufficient
millivoltage
3. Plugged burner orifice
4. Defective automatic valve
operator
Frequent pilot 1. Pilot flame may be too low
outage problem or blowing (high) causing
the pilot safety
to drop out
2. Possible blockage of the
vent terminal
33
SIT NOVA 820 MILLIVOLT VALVE
Possible Causes
1. Using a match, light pilot. If pilot lights, turn off pilot and push the red button
2. With the control knob in the pilot position, push the control knob all the way and
1. Check pilot flame. Must impinge on thermocouple/thermopile. NOTE: This
2. Turn valve knob to "Pilot". Maintain flow to pilot; millivolt meter should read
1. Check wall switch and wires for proper connections. Jumper wire across
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3. Check burner orifices for debris and remove.
4. Turn valve knob to "On", place wall switch to "On" millivolt meter should read
1. Clean and/or adjust pilot flame for maximum flame impingement on thermopile
2. Check the vent terminal for blockage (recycling the flue gases)
Vermont Castings • Stardance SDDVTSB Installation Manual_R10 • 04/18
Corrective Action
again. If pilot will not ligh - check gap at electrode and pilot-should be 1/8" to
have a strong spark.
hold. Check for spark at electrode and pilot. If no spark to pilot, and electrode
wire is properly connected, replace the battery in the ignitor module and try
again. Refer to Maintenance Section. If the problem still exists, replace the
ignitor module box.
pilot burner assembly utilizes both a thermocouple and a thermopile. The
thermocouple operates the main valve operation (On and Off). Clean and or
adjust pilot for maximum flame impingement on thermopile and thermocouple.
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.
terminals at wall switch, if burner comes on, replace defective wall switch.. If
okay, jumper wires across wall switch wires at valve, if burner comes on, wires
are faulty or connections are bad.
Be sure wire connections form thermopile at gas valve terminals are tight
and thermopile is fully inserted into pilot bracket.
One of the wall switch wires may be grounded. Remove wall switch wires
form valve terminals if pilot now stays lit, trace wall switch wiring for ground.
May be grounded to stove or gas supply.
Check thermopile with millivolt meter. Take reading at thermopile terminals
of gas valve. Should read 250-300 millivolts (minimum 150) while holding
valve knob depressed in pilot position and wall switch "Off". Replace faulty
thermopile if reading is below specified minimum.
greater than 150mV. If the reading is okay and the burner does not come on,
replace the gas valve.
and thermocouple.
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