Design Dynamics VTD-18N-PDG Owner's Operation And Installation Manual

Also see for VTD-18N-PDG: OWNER'S OPERATION AND INSTALLATION MANUAL

Contents

www.fmiproducts.com 111826-02K16tROUBLESHOOtINGContinuedOBSERvED PROBLEMODS/pilot lights but flame goesout when control knob is re-leasedBurner does not light after ODS/pilot is litDelayed ignition of burnerBurner backfiring during com-bustionPOSSIBLE CAUSE1. Control knob not fully pressed in2. Control knob not pressed inlong enough3. Safety interlock system hasbeen triggered4. Equipment shutoff valve notfully open5. Pilot flame not touching ther-mocouple, which allows ther-mocouple to cool, causingpilot flame to go out. Thisproblem could be caused byone or both of the following:A) Low gas pressureB) Dirty or partially cloggedODS/pilot6. Thermocouple connectionloose at control valve7. Thermocouple damaged8. Control valve damaged1. Inlet gas pressure is too low2. Burner orifice clogged3. Remote selector in OFFposition4. Wire disconnected from gascontrol1. Manifold pressure is too low2. Burner orifice clogged1. Burner orifice is clogged ordamaged2. Damaged burner3. Gas regulator defectiveREMEDY1. Press in control knob fully2. After ODS/pilot lights, keepcontrol knob pressed in 30seconds3. Wait one minute for safety in-terlock system to reset. Repeatignition operation4. Fully open equipment shutoffvalve5. A) Contact local natural orpropane/LP gas companyB) Clean ODS/pilot (seeCleaning and Maintenance,page 14) or replace ODS/pilotassembly6. Hand tighten until snug, thentighten 1/4 turn more7. Replace pilot assembly8. Replace control valve1. Contact local natural or pro-pane/LP gas company2. Clean burner (see Cleaningand Maintenance, page 14)or replace burner orifice3. Put remote selector in ONposition4. See Wiring Diagram, page 141. Contact local natural or pro-pane/LP gas company2. Clean burner (see Cleaningand Maintenance, page 14)or replace burner orifice1. Clean burner (see Cleaningand Maintenance, page 14)or replace burner orifice2. Replace damaged burner3. Replace gas regulator