Stimmen - 2, Durchschnittliche Bewertung: 3.5 ( )

Hersteller: Nordyne Dateigröße: 1.15 mb Dateiname: Unterrichtssprache:

Flashing 1/2 second on, 1/2 second off - system is locked out or in restricted mode. 2. Flashing 2 seconds on, 2 seconds off - control is in recycle mode. 3. Indicator light is on - cad cell is sensing flame. 4. Indicator light is off - cad cell is not sensing flame. may be defective. Replace the gas valve if necessary. e. Be sure the pilot shield is in place. f. Check for gas leaks in the pilot line or the pilot assembly. g. Check the flue assembly to make sure all connections are tight. h. See the FURNACE START-UP procedure for lighting details. Main Flame Is Not Burning Properly a. Check the manifold gas pressure. b. Check for the correct main burner orifice. -See the nameplate SPECIFICATION. c. Check the flue for any blockages or loose connections. d. Check the combustion air passages for blockage. High Gas Bills a. Be sure the proper orifices are being used. b. Be sure the return air system is clear and free of blockage. c. Be sure the furnace filter is clean. d. Be sure the home is insulated, that windows and doors fit tightly, and that there are no leaks in the heating duct system. e. Check the room thermostat to be sure the setting is not higher than necessary. Low humidity requires higher temperatures for the same level of comfort. Check for proper humidity level in the home. TROUBLESHOOTING DIRECT IGNITION FURNACES INCLUDING GAS GUN Burner Motor Does Not Run— Thermostat Calls For Heat a. Check the electrical supply to the furnace. b. Be sure the furnace On-Off switch is in the “ON” position. c. Defective thermostat circuit - white and red thermostat low voltage leads (M1M*, M1B* models). If the burner motor or combustion fan runs, check: • Thermostat connections • Thermostat d. No voltage to control module - determine if 24 volts (or 120 volts) is available to the control module. If voltage is not available check for: • Blown fuse, defective transformer, circuit breaker, no electrical supply. • Limit switch open. • Loose connections. Combustion Blower Does Run - No Flame a. Defective centrifugal switch (M1B* Model). • Check the operation of centrifugal switch by removing end bell of the burner motor. • Clean contacts of motor. • If the contacts are closed, replace the motor. b. Defective pressure switch (M1M* and M1G* 077, 090 Models) - check air tube and electrical connections. c. Burner in purge mode - allow 75 seconds for flame establishing period. d. Check for proper electrical connections at purge timer, control box, or gas valve. e. Check for gas supply - gas line valve on, control lever on. Control Module Is Powered— Ignitor Does Not Heat Up a. Disconnect ignitor leads at AMP receptacle and check for 120 volts at the plug during ignition sequence. b. Replace ignition control if 120 volts is not available at AMP plug during ignition sequence. 120 Volts Is Available At AMP Plug— Ignitor Does Not Heat Up a. Disconnect power to the furnace. b. Disconnect AMP plug to the ignitor, and check ignitor resistance with an ohm meter. Set on RX1 scale. • Normal reading should be 40 - 75 ohms. • If above or below this rating at room temperature change ignitor. c. Check for continuity from ignitor receptacle to burner. Main Flame Ignites— Burner Locks Out a. Ignition control is not properly grounded. b. Defective ignition control. c. Improper polarity of 120 volt power supply. d. Ignitor has hairline crack. e. Improper gas pressure or burner air adjustment is not allowing flame to contact ignitor tip for flame rectification. f. Misaligned ignitor does not allow flame to contact ignitor tip for flame rectification. Burner Short Cycling —Thermostat Calls for Heat, Limit Switches Closed a. Check for polarity. b. Check ground. c. Check flue. d. Check combustion air. e. Check gas pressure. f. Check orifice. g. Check the position of ignitor, a normal reading should be 40-75 ohms. 24 Volts Supplied To Gas Valve During Ignition — No Main Gas Flow a. Gas valve may be defective. Replace if necessary. b. Gas piping may be plugged. Check for adequate gas supply to gas valve at union. Burner Operates— Insufficient Heat a. Check thermostat for proper setting and location. Thermostat should not be located where it will be affected by another heat source. b. Check for clean filter and proper air flow. c. Check burner for proper gas firing rate. d. Be sure unit is not undersized for its thermal load. e. Check thermostat anticipator. The nominal anticipator setting is 0.4. Burner Flame Without Motor Running a. Gas valve stuck open, check gas valve for proper operation (replace if necessary) and inspect heat exchanger. b. Check for 115 volts to the combustion blower motor; replace if necessary. c. If no power to combustion blower then check wiring and control module; replace if necessary. Circulation Air Blower Will Not Operate Even Though The Burner Does Operate a. Check thermostat “G” wiring. b. Check wiring to motor. c. Check for a defective motor. TROUBLESHOOTING - OIL GUN Honeywell R7184 oil gun control only. Burner do...

Herunterladen

Geben Sie zwei Ziffern: