Millivolt Troubleshooting Guide Gas Products NOVA SIT Valves
Contents
1. system to operate consistently If lower than 325 mv change the thermopile WRESENSY Thermopile Millivolt Check Symptom Intermittent shutdown or main burner will not light with on off switch Thermopile Output MAIN BURNER ON 110 mv minimum required for system to operate consistently If lower than 110 mv conduct valve operating head test If valve proves good change the thermopile REGENCY Circuit Millivolt Check Symptom Intermittent shutdown or main burner will not light with on off switch The Thermopile energized by the pilot flame generates sufficient power to operate the gas valve and on off switch Voltage drop across the switch terminals Burner on 35 mv or less Set meter to MV or Volts DC Place one lead to TP TH and place one lead to TH If higher than 35mv check connections and switch aa Circuit Millivolt Check Symptom Intermittent shutdown or main burner will not light with on off switch The Thermopile energized by the pilot flame generates sufficient power to operate the gas valve and on off switch Set meter to Ohms Place one lead to each spade switch in on position If higher than 0 3 ohms replace switch QREGENCY Valve Operating Head Test Symptom Intermittent shutdown or main burner fails when burner switch or thermostat is turned on Before conducting this test disconnect all leads from valve Set meter to Ohms for this test One lead goes to TP One lead go2. Millivolt Troubleshooting Guide Gas Products NOVA SIT Valves 1 Thermocouple Millivolt Check 2 Safety Magnet Testing 3 Thermopile Millivolt Check 4 Circuit Millivolt Check 5 Valve Operating Head Test WREGENCY REGENCY Thermocouple Millivolt Check Symptom Pilot light will not hold Thermocouples have a maximum output of 25 to 30 millivolts Millivolt reading for thermocouple Pilot On 8 to 30 mv Set meter to MV or Volts DC Place one lead to wire supplied place one lead to outer casing Ifthe millivolt reading is less then 7 mv then change the thermocouple Shutdown time for thermocouple after flame failure is up to 90 sec The drop out range for thermocouple magnet is 6 to 2 mv lf thermocouple reading is good proceed to safety magnet test Next Page Safety Magnet Testing EGENCY REGENC pilot flame magnet Set meter to Ohms for this test While taking a Millivolt reading on a safety magnet disconnect thermocouple amp wires from the valve Place one meter lead to soldered point on back of valve and one to ground Good reading is 0 to 0 2 Ohms If the reading is higher magnet is defective therefore Change the Valve Do not try to repair Good Reading Bad Reading WRESENSY Thermopile Millivolt Check Symptom Intermittent shutdown or main burner will not light with on off switch Set meter to Volts DC Millivolts Thermopile Output MAIN BURNER OFF 325 mv minimum required for
3. es to TH Good reading is 0 to 2 6 ohms if reading are higher change the valve m er y REGENCY Carbon Build up Symptom carbon build up on glass and or logs This is the result of incomplete combustion Insufficient primary air Check primary air shutter is set to manufactures setting Incorrectly set logs Check that log positioning is as installation manual specifies Oversized orifice burner amp pilot Check orifice size to rating plate attached to the appliance Too high pressure Check inlet amp manifold pressure for possible overfiring Incorrect or impure fuel Other possible causes Too much ember material and or rockwool dirty primary air shutter inlet un serviced appliance
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