Lennox G24MCE2-45, Installation Instructions Manual

Page 1: ...on Control Board Diagnostic Codes 23 Troubleshooting 24 Repair Parts List 27 G24MCE Parts Arrangement 27 G24MCE Start up Performance Check List 28 WHAT TO DO IF YOU SMELL GAS If the information in thi...

Page 2: ...th a 19 mm scored flange that may be bent 90_ for plenum connection The dimensions shown were taken after the flange was bent The double scored flange at the front of the supply air opening may be ben...

Page 3: ...le NOTE For installation on combustible floors appliance shall not be installed directly on carpeting tile or combustible ma terial such as wood flooring Protection via a non combus tible material mus...

Page 4: ...ustion process If sufficient combustion air is not available the furnace or other appliance will operate inefficiently and unsafely Enough air must be provided to meet the needs of all fuel burning ap...

Page 5: ...a minimum free area of 5 5cm2 per 1 kW 1 square inch per 4000 Btuh of total input rating of all equipment in the enclosure See figures 2 and 3 When communicating with the outdoors through hori zontal...

Page 6: ...unting grommet used with a flexible mounting leg This shipping bolt and flat washer must be removed be fore the furnace is put into operation Once the shipping bolt and washer are removed the rigid le...

Page 7: ...g four screws 8 Install cabinet bottom using four no 10 screws 9 Position strain relief grommets on ignition and flame sensor wires Insert wires and grommets through holes on side of burner box Reconn...

Page 8: ...flanges seal against glass fibre strips 5 Set unit on additive base so unit flanges drop into ple num Refer to figure 8 NOTE Be careful not to damage glass fibre strips Check for tight seal C Installa...

Page 9: ...ws return air from the furnace chamber attic or underfloor space The furnace platform must be level with no sagging cracks or gaps Furnaces must always be isolated from other heat ing appliances to pr...

Page 10: ...on VERTICAL FLUE USING METAL FLUE PIPE The flue system should be of the same nominal diameter as the adapter supplied with the unit and should be fitted inside the adapter either directly or using a c...

Page 11: ...horizontal runs of flue connector with straps or hangers so that there are no dips or sags 11 Support the flue connector at 1m 3 ft intervals and at all elbows 12 If single wall flue is used fasten t...

Page 12: ...METAL FLUE PIPE These instructions should be used as a guide and do not supersede local codes in any way Size and install the G24MCE horizontal flue according to the national and lo cal codes and reg...

Page 13: ...ion of gas piping or top entry in horizontal applications Connect the gas supply to the piping assembly 5 When connecting gas supply factors such as length of run number of fittings and furnace rating...

Page 14: ...5 19 55 18 42 17 56 2 2 067 111 93 79 93 62 34 53 84 47 60 43 07 39 67 36 84 34 57 32 58 2 1 2 2 469 178 53 123 27 99 75 85 01 75 09 68 01 63 76 58 09 55 26 52 62 3 3 068 311 72 218 20 117 11 150 19 1...

Page 15: ...nt using wir ing diagrams provided with unit and in field wiring dia grams shown in figures 20 Use 18 gauge wire or larg er for thermostat connections 7 Electrically earth unit according to national r...

Page 16: ...MPER HEATING SPEED TAP TERMINAL COOLING SPEED TAP TERMINAL CONTINUOUS FAN TERMINAL HEATING ACCESSORY TERMINAL DIAGNOSTIC LEDS RED DIAGNOSTIC BUTTON Depress button and hold for display of last failure...

Page 17: ...Page 17 G24MCE SCHEMATIC WIRING DIAGRAM 03 99 240V 1PH 50HZ FIGURE 22...

Page 18: ...This furnace is equipped with an ignition device which automatically lights the burners Do not try to light the burners by hand 5 Wait five 5 minutes to clear out any gas If you then smell gas STOP I...

Page 19: ...her pin combinations to achieve the desired time TIMING JUMPER TIMING PINS seconds FAN OFF TIME ADJUSTMENT FIGURE 24 GAS FLOW To check for proper gas flow to combustion chamber deter mine heat kW inpu...

Page 20: ...after servicing At the beginning of each heating season service items A through E as described below A ELECTRICAL 1 Check all wiring for loose connections 2 Check for correct voltage at the furnace f...

Page 21: ...ust ments section HEAT EXCHANGER Periodically inspect the heat exchanger tubes and flue box for corrosion If necessary clean as indicated below 1 Turn off the electrical and gas supply to furnace 2 Di...

Page 22: ...1 24 0 5 1 24 0 5 14 INJECTOR SIZE MORSE mm 48 1 93 48 1 93 48 1 93 48 1 93 44 2 18 44 2 18 44 2 18 15 BURNER PRESSURE G20 GAS UK mBAR WC 8 5 3 4 8 5 3 4 8 5 3 4 8 5 3 4 8 5 3 4 8 5 3 4 8 5 3 4 16 BUR...

Page 23: ...pattern indicates that the pressure switch opened during operation due to reduced flow of combustion products or a blocked condensate drain Flashing Off DIAG 2 DIAG 1 Flashing Alternately DIAG 1 DIAG...

Page 24: ...SWITCH WATCHGUARD CONDITION GAS VALVE COMB BLOWER AND INDOOR BLOWER WITH DELAY OFF DIAG CODE 1 OFF 2 FLASHING C A B PRESSURE SWITCH OPEN IS 5 MINUTE RESET PERIOD COMPLETE INDOOR AIR BLOWER ON 45 SECS...

Page 25: ...SENSE IS MAIN BURNER FLAME OFF LED SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT COOLING CYCLE THERMOSTAT CALLS FOR COOLING COMPRESSOR CONTACTOR AND SYSTEM FAN ENERGIZED WITH 0 SECOND DELAY ACB COOL SP...

Page 26: ...FOR COOLING SYSTEM FAN SWITCHES TO HEATING SPEED AFTER SELECTED DELAY ACC TERM REMAINS ENERGIZED SYSTEM FAN SWITCHES TO CONTINUOUS SPEED AND ENERGIZES ACC TERMINAL BOTH REMAIN ON UNTIL CONTINUOUS FAN...

Page 27: ...ary tube limit Cabinet bottom HEATING PARTS Pressure switch Flue adapter Heat exchanger Wire harness plug cap ELECTRICAL PARTS Main burners Flue box Transformer Main burner orifices Combustion air fan...

Page 28: ...Motor H P Kw Fan Motor Lubrication OK Gas Piping Connections Tight Leaks Tested Fuel Type Natural Gas LP Propane Gas Furnace kW Input Line Pressure Regulator Pressure w c mBAR Nat w c mBAR LP Propane...