Lenoxx Electronics G24MCE Furnace User Manual
Contents
1. LENNOX PRODUCT LITERATURE 1999 Lennox Industries Inc Dallas Texas USERS INFORMATION MANUAL 503 208M 9 99 Supersedes 9 98 GAS FIRED FURNACE RETAIN THESE INSTRUCTIONS ieee FOR FUTURE REFERENCE Litho USA WARNING If the information in this manual is not followed exactly a fire or explosion W may result causing property damage personal injury or loss of life Do not store or use petrol or other flammable vapours and liquids in the vicinity of this or any other appliance Installation and service must be per formed by a qualified installer ser vice agency or the gas supplier WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Extinguish any open flames Do not touch any electrical switch do not use any telephone in your building Immediately call your gas supplier from a neighbor s telephone Follow the gas sup plier s instructions if you cannot reach your gas supplier call the local fire brigade Page 1 G24MCE Parts Identification Oo Oa O COMBUSTION AIR FAN PR2. signs of water burnt or damaged wires or components Fan access door Must be properly in place and provide a seal between the return air and the room where the fur nace is installed Return air duct Must be properly attached and provide an air seal to unit Operating performance Unit must be observed during operation to monitor proper performance of the unit and the vent system Combustion gases Flue products must be analyzed and compared to the unit specifications Problems detected during the inspection may make it necessary to temporarily shut down the furnace until the items can be repaired or replaced Pay attention to your furnace Situations can arise be tween annual furnace inspections that may result in un safe operation For instance items innocently stored next to the furnace may obstruct the combustion air supply This could cause incomplete combustion and the produc tion of carbon monoxide gas Page 6
3. Directions 1 Keep the furnace area clear and free of combustible material petrol and other flammable vapours and liq uids If installed in an insulated area furnace must be kept free of insulating material Insulating material may be combustible Inspect furnace venting system to make sure it is in place physically sound and without holes corrosion or blockage Inspect furnace return air duct connection to ensure duct is sealed to the fur nace and terminates outside the space containing the furnace Inspect the physical support of the furnace to guarantee that it is sound without sagging cracks or gaps around base and it maintains seal between base and support 2 DO NOT obstruct air flow to unit Unit must receive an unobstructed flow of combustion and ventilating air 3 DO NOT store chlorine or fluorine products near unit or introduce these products into the combustion air These products can cause furnace corrosion 4 DO NOT draw return air from a room where this furnace or any other gas appliance ie a water heater is installed When return air is drawn from a room a negative pressure is created in the room If a gas appliance is operating in a room with negative pressure the flue products can be pulled back down the vent pipe and into the room This reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas This toxic gas might then be distributed throughout the house
4. by the furnace duct system Your furnace is a gas appliance It is critical that the gas supplied to the unit be completely burned to avoid the pro duction of carbon monoxide gas Complete combustion of the gas requires but is not limited to correct gas pres sure and gas flow rate adequate combustion air and proper venting Page 3 AWARNING Carbon monoxide gas is invisible odorless and toxic Exposure to this gas can cause personal injury and even death to all occupants including pets Any item that is powered by or gives off heat from a combustion process including lawn mowers automobiles and fireplaces has the potential to produce carbon mon oxide gas Because ofthis Lennox recommends the use of a carbon monoxide detector in your home even if you do not own gas appliances Reliable de tectors are available at reasonable retail prices Con tact your independent Lennox dealer for more details about this investment in your safety Your furnace is designed to meet standards set by nation al agencies and to operate safely when properly installed and maintained However the unit s performance can be greatly impacted by the individual installation and the op erating environment It is your responsibility to ensure that this appliance is maintained Proper maintenance is critical for your safety and the satisfactory operation of the product Lennox strongly recommends annual in spection and maintenance of this
5. mode To reset the Watchguard mode manually switch the ther mostat from HEAT to OFF and then back to HEAT again Note This lockout mode will also automatically reset after a 60 minute lockout period The Hard lockout mode can be reset by turning the elec trical power OFF and then back ON again If either of these two lockouts reoccur or if the original lock out cannot be reset call a qualified gas service engineer Service Reminder Call your Lennox service technician if unit is inoperative Before calling always check the following to be sure ser vice is required 1 Check that electrical isolator switches are ON 2 Check room thermostat for proper setting 3 Replace any blown fuses or reset circuit breakers 4 Air filter should not be clogged limiting air flow 5 Is gas turned on at meter 6 Is manual gas cock open To keep your Lennox gas heating system in peak operating condition year after year contact your independent Lennox dealer about a planned service program Safety Precautions If you discover any of the following shut down your unit and contact an independent Lennox dealer for an inspection by a qualified technician e If you repeatedly hear any new or unfamiliar sounds while your unit is operating there may be a problem For example poorly performing burners can produce unfamiliar noises If you smell any unusual odors your unit may be oper ating improperly For ex
6. ESSURE SWITCH GAS VALVE CAPILLARY TUBE LIMIT BURNERS CONTROL BOARD HIGH LIMIT MAIN FAN ONOORWNH 5 UPFLOW POSITION DOWNFLOW POSITION AWARNING AWARNING This appliance must be earthed Do not use this furnace if any part has been under water Immediately call a qualified service techni cian to inspect the furnace and to replace any part AWARNING of the control system and any gas control which has been under water This product contains glass fibre insulation If in sulation is disturbed during installation mainte nance or repair persons may be exposed to irrita A CAUTION tion to the skin eyes and lungs Tears in the insula Before attempting to perform any service or mainte tion should be repaired straight away nance turn the electrical power to unit OFF at isola tor switch kdai AS IMPORTANT If overheating occurs or if gas supply fails to shut AIMPORTANT off shut off the manual gas valve to the appliance Any additions changes or conversions required in before shutting off electrical supply order for the appliance to satisfactorily meet the ap plication needs must be made by a Lennox service technician using factory specified and approved parts Page 2 Important
7. ample units can give off unfa miliar odors if components are required to operate in abnormal conditions Look for visible signs of a malfunctioning unit Exam ples include unusual amounts of condensate on win dows inside your house visibly burnt components or unusual dirt or rust accumulations on the vent pipe or in the unit If you experience headache nausea fatigue or dizzi ness the cause could be exposure to carbon monox ide gas This is often misdiagnosed as the flu because symptoms are similar If you suffer from flu like symp toms that are exaggerated at home but seem to sub side while you are away from the house exposure to carbon monoxide could be the cause Your vigilance may pay off in early detection of a problem before either personal injury or property damage occurs Do not hesitate to contact a qualified service technician as an investment in your well being Planned Service You should expect a service technician to check the fol lowing items during an annual inspection Power to the unit must be shut off for the service technician s safety Fresh air grilles and louvers on the unit and in the room where the furnace is installed Must be open and unob structed to provide combustion air Burners Must be inspected for rust dirt or signs of wa ter Vent pipe Must be inspected for signs of water dam aged or sagging pipe or disconnected joints Unit appearance Must be inspected for rust dirt
8. appliance Contact your independent Lennox dealer for an inspection by a qualified service technician AWARNING If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or loss of life BEFORE LIGHTING smell all around the appliance area for gas Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor Placing Furnace Into Operation G24MCE units are equipped with an electronic ignition sys tem Do not attempt to manually light burners on these fur naces Each time the thermostat calls for heat the burner will automatically light THERMOSTATS Il eo 70 90 30 y 60 want CD FIGURE 1 Gas Valve Operation 1 STOP Read the safety information at the beginning of this section 2 Set the thermostat to lowest setting See figure 1 3 Turn off all electrical power to the unit 4 This furnace Is equipped with an ignition device which automatically lights the burner Do not try to light the burner by hand 5 Wait five 5 minutes to clear out any gas If you then smell gas STOP Immediately call your gas supplier from a neighbors phone Follow the gas suppliers instructions If you do not smell gas go to next step Turn on all electrical power to the unit Set the thermostat to desired setting NOTE When unit is first started step
9. lting in personal injury or death Burner Flame The G24MCE burner flame is not adjustable however the flame should be inspected at the beginning of each heating season and burners should be cleaned if neces sary Burner flame should be blue when burning natural gas blue yellow when burning propane gas Page 5 BURNER FLAME FLAME APPEARS BLUE IF BURNING NAT GAS BLUE YELLOW FOR PROPANE HEAT EXCHANGER TUBE xN FIGURE 4 Venting System Inspection Annually before heating season inspect furnace venting system vent cap heat exchanger and burners for corro sion deterioration or deposits of debris Remove any ob structions Contact your Lennox dealer for a periodic unit inspection by a qualified gas service engineer Capillary Tube Limit Switch Your Lennox furnace is equipped with a manually reset capillary tube limit switch which shuts off the gas supply to the furnace in the event of inadequate supply air high air temperature It is located on the vestibule panel near the gas valve To reset this control push the switch on the face of the control sideways If this switch opens again consult a qualified gas service engineer Control Board Lockouts Several types of control board lockout modes exist on this furnace When in one of these modes the control board will not allow the furnace to start The two modes that can be manually reset are a Watchguard lockout mode and a Hard lockout
10. s 1 through 7 may need to be repeated to purge air from gas line 8 If the appliance still will not operate follow the instructions Turning Off Gas To Unit and call your service technician or gas supplier Turning Off Gas To Unit 1 Set the thermostat to the lowest setting 2 Turn off all electrical power to the unit if service is to be performed DAN Page 4 G24MCE series units are equipped with external filters which should be inspected monthly and replaced when necessary to assure proper furnace operation See table 1 for filter sizes Replacement filters used with G24MCE 40 60 75 units must have a minimum veloc ity rating of 2 m s 400 FPM Replacement filters used with G24MCE 100 120 140 units require a minimum velocity rating of 3 2 m s 625 FPM Figures 2 and 3 show possible filter locations when the units are installed in the upflow position TABLE 1 FILTER SIZE millimeters inches 406X508X25 G24MCE 45 60 75 508X508X25 G24MCE 100 120 140 20 X 20 X 1 MODEL NO UPFLOW FURNACE BOTTOM RETURN AIR FIGURE 2 UPFLOW FURNACE SIDE RETURN AIR MUU MMU MU MI FIGURE 3 Check and clean fan wheel for any debris Fan motor is prelubricated for extended bearing life No further lubrica tion is needed AWARNING Fan door must be securely in place when fan and burners are operating Gas fumes which could contain carbon monoxide can be drawn into living space resu
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