Accurex XDG Installation, Operation And Maintenance Manual
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Contents
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Direct Gas Make-Up Air50TroubleshootingProblem: Heater does not operate (120V industrial pilot: 12-inch burner or greater).Is fan operating correctly? Yes No Refer to Troubleshooting, Supply Fan.24 VAC between terminals W1 and C? Yes No Heat switch (S4) off. Turn heat switch (S4) on.Heat switch not wired. Wire heat switch (S4).If a heat switch is not required and a heating inlet air sensor isprovided, place jumper from R to W1 to allow the heat to enablebased on the heating inlet air sensor.24 VAC between A2 and A1 on RHrelay?Yes No (Optional) inlet air sensor (TS4) holding. Adjust TS4 setting.Reference Supply Fan, Start-Up.Fan interlock (ST1 or RF) open. Refer to Troubleshooting, SupplyFan.Line voltage at primary side of TR3? Yes No Transformer fuses (FU7) blown. Check and replace blown fuse(s).115 VAC between terminals 102 and101?Yes No Transformer secondary fuses (FU8) blown. Check and replaceblown fuse(s).Transformer TR3 wired incorrectly. Refer to wiring diagram ontransformer and correct wiring.Transformer TR3 faulty. Replace transformer.115 VAC between terminals 103 and101?Yes No Heat relay (RH) failure. Check for loose connections or bent relaypins, repair or replace relay.Does power light on the flamesafeguard blink approximately every5 seconds as it performs a self-diagnostics check?Yes No Check wiring in flame safeguard subbase. Correct any wiringissues.Flame safeguard (FSG) faulty. Replace flame safeguard.115 VAC betweenterminals 104 and 101?Yes No High limit (HLC1) tripped. Reset/replace high limit (HLC1).Investigate cause of high limit trip.115 VAC betweenterminals 106 and 101?Yes No (Optional) high/low gas pressure switch(es) (PS3 and PS4)tripped. Correct gas pressure and reset. Reference Pre-Start: DirectGas-Fired Heating, All Units.Is alarm light blinking on the flamesafeguard (FSG)?No Yes Record the flash code from the alarm light. Reference the flamesafeguard literature or contact the factory for details about the alarmflash codes. Investigate the cause of the code.Push the reset button to reset the fault.Is test/run switch (located on top offlame safeguard) in 'Run' mode?Yes No Move switch to 'Run'.115 VAC betweenterminals 107 and 101?Yes No Check wiring in flame safeguard subbase. Correct any wiringissues.Flame safeguard (FSG) faulty. Replace flame safeguard.115 VAC betweenterminals 108 and 101?Yes No Airflow switch (PS2) holding for proper airflow.Correct airflow across burner. Reference Start-Up: Direct Gas-FiredHeating, All Units.Is the pilot light on the flame safeguard(FSG) illuminated?Yes No Check wiring in flame safeguard subbase. Correct any wiringIssues.Flame safeguard (FSG) faulty. Replace flame safeguard.115 VAC betweenterminals 109 and 101?Yes No Check wiring in flame safeguard subbase. Correct any wiringissues.Flame safeguard (FSG) faulty. Replace flame safeguardPilot flame visible through sight glass? No Yes Skip to question that reads, Red flame light on flamesafeguard (FSG) illuminated?Inlet gas pressure between theminimum and maximum values shownon the direct gas label?Yes No Correct the inlet gas pressure.ADirect Gas-Fired Heat |
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