Radiance Direct Vent Gas Heater
Troubleshooting the Gas Control System (RADVT Series)
SIT NOVA 820 MILLIVOLT VALVE
NOTE: Before trouble shooting the gas control system, be sure external gas shut off is in the “On” position.
| Symptom | Possible Causes | Corrective Action | |
|
|
|
| |
1. | Spark ignitor will not light | A. Defective or misaligned electrode | Using a match, light pilot. If pilot lights, turn off pilot and | |
|
| at pilot | push the red button again. If pilot will not light - check | |
|
|
| gap at electrode and | |
|
|
| strong spark. | |
|
|
|
| |
|
| B. Defective ignitor (Push Button) | With the control knob in the pilot position, push the | |
|
| control knob all the way and 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. | |
|
|
|
| |
2. | Pilot will not stay lit after | A. Defective pilot generator (thermo- | Check pilot flame. Must impinge on thermocouple/ther- | |
mopile. NOTE: This pilot burner assembly utilizes both | ||||
| carefully following lighting | couple), remote wall switch | ||
| a thermocouple and a thermopile. The thermocouple | |||
| instructions |
| ||
|
| operates the main valve operation (On and Off). Clean | ||
|
|
| ||
|
|
| and or adjust pilot for maximum flame impingement on | |
|
|
| thermopile and thermocouple. | |
|
|
|
| |
|
| B. Defective automatic valve | Turn valve knob to “Pilot”. Maintain flow to pilot; millivolt | |
|
|
| 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. | |
|
|
|
| |
3. | Pilot burning, no gas to | A. Wall switch or wires defective | Check wall switch and wires for proper connections. | |
Jumper wire across terminals at wall switch, if burner | ||||
| main 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. | |
|
|
|
| |
|
| B. Thermopile may not be generat- | 1. Be sure wire connections form thermopile at gas | |
|
| valve terminals are tight and thermopile is fully | ||
|
| ing sufficient millivoltage | ||
|
| inserted into pilot bracket. | ||
|
|
| ||
|
|
| 2. One of the wall switch wires may be grounded. Re- | |
|
|
| move wall switch wires form valve terminals if pilot | |
|
|
| now stays lit, trace wall switch wiring for ground. | |
|
|
| May be grounded to fireplace or gas supply. | |
|
|
| 3. Check thermopile with millivolt meter. Take reading | |
|
|
| at thermopile terminals of gas valve. Should read | |
|
|
| ||
|
|
| valve knob depressed in pilot position and wall | |
|
|
| 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 opera- | Turn valve knob to “On”, place wall switch to “On” | |
|
| millivolt meter should read greater than 150mV. If the | ||
|
| tor | ||
|
| reading is okay and the burner does not come on, | ||
|
|
| ||
|
|
| replace the gas valve. | |
|
|
|
| |
4. | Frequent pilot outage | A. Pilot flame may be too low or | Clean and/or adjust pilot flame for maximum flame | |
impingement on thermopile and thermocouple. | ||||
| problem | blowing (high) causing the pilot | ||
|
| |||
|
| safety to drop out |
| |
|
|
|
| |
|
| B. Possible blockage of the vent | Check the vent terminal for blockage (recycling the flue | |
|
| terminal | gases). | |
|
|
|
|
20012697 | 31 |