Lennox International Inc. F8AUH Furnace User Manual
Contents
1. an inspection by a qualified service technician 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 Annual inspection and maintenance of this appliance is strongly recommended Contact your dealer for an inspection by a qualified service technician Lighting Information and Operation 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 Use only your hand to push in or turn the gas control knob Never use tools If the knob will not push in or turn by hand do not try to repair it call a qualified service technician Force or attempted repair may result in a fire or explosion Placing furnace into operation F8AUH units are equipped with an electronic ignition system Do not attempt to manually light burners on these furnaces Each time thermostat calls for heat the burner will automatically light Gas Va2. lubrication is needed AWARNING Blower door must be securely in place when blower and burners are operating Gas fumes which could contain carbon monoxide can be drawn into living space resulting in personal injury or death Burner Flame The burner flame is not adjustable however the flame should be inspected at the beginning of each heating season and burners should be cleaned if nec essary Burner flame should be blue when burning natural gas blue yellow when burning propane gas BURNER FLAME FLAME APPEARS BLUE IF BURNING NAT GAS BLUE YELLOW FOR PROPANE HEAT EXCHANGER TUBE xN FIGURE 6 Venting System Inspection Annually before heating season inspect furnace venting system vent cap heat exchanger and burn ers for corrosion deterioration or deposits of debris Remove any obstructions Contact your dealer for a periodic unit inspection by a qualified service technician Flame Rollout Safety Switches Your furnace is equipped with two flame roll out safe ty switches which shut off the gas supply to the fur nace in case of heat exchanger blockage If the fur nace fails to operate due to the functioning of these safety switches DO NOT attempt to place the furnace into operation Contact a qualified service technician Safety Reminder Call a qualified service technician if unit is inopera tive Before calling always check the following to be sure service is required 1 Check
3. 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
4. 100 100 000 29 jBlank No options J Cabinet Color OO 120 OOD 85 1 j L L oe ee L Beige gt Additive Cooling Nominal a S Gray Door Color 1 5 Ton kW IR L S UF Up Flow DF Down Flow HZ Horizontal MP Multi Position B 24 2 Ton kW DH Downflow Horizontal EOW Beige ae on UH Up Flow Horizontal Green G Gray 30 2 5 Ton kW ellie a ce chee Silver lB Brown 36 3 Ton kW oa R Geen 42 3 5 Ton kW S Silver 48 4 Ton kW Lee a 60 5 Ton kW A WARNING If the information in this manual is not followed exactly a fire or explosion bia d FBR 113270 Do not store or use gasoline or oth er flammable vapors and liquids in the vicinity of this or any other ap pliance A Prt S CANADIAN GAS ASSOCIATION q APPROVED may result causing property damage personal injury or death 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 Installation and service must be performed by a qualified installer service agency or the gas supplier use any phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas suppli er s instructions if you cannot reach your gas supplier call the fire department 1 1999 PARTS IDENTIFICATION A
5. F8AUH Gas Furnaces Up Flow Horizontal 45 000 to 120 000 Btuh 13 2 to 35 2 kW Heating Capacity 1 through 5 Tons 3 5 to 17 6 kW Add On Cooling User s Information Manual 503 995M RETAIN THESE INSTRUCTIONS 06 99 FOR FUTURE REFERENCE Supersedes 05 99 Table of Contents Important Directions 222 0055 2 Venting System Inspection 5 Lighting Information and Operation 3 Flame Rollout Safety Switches 5 PINGS ete ees sates Ran eo rents as Lane pret ars O D oe 4 Safety Reminder 2 02000eee eee 5 BIQWE ies c aa eters nage ad te GONG ao ale ane Ree 5 Safety Precautions 2 0200020 ee eee 5 Bumer Flame voce is tannies ka ee ta beed vee 5 Planned Service 2 c eee eee 6 Model Number Identification NOTE Shaded area denotes part of F 8 A UH 24 045 X 2V model no referenced in publication TFunace of Lt L TBiower Motor 7 L 4J Gas Valve q V Variable Speed Motor AFUE 2 Two Stage Valve Blank Multi Speed Motor 8 80 Blank Single Stage Valvey _ 19 90 j Options 7 please arte Btuh Input kW 7 X Low NOx Generation J 045 45 000 jE LPG Propane Gas a ee 060 60 000 17 S Stainless Steel Heat Exchanger l Configuration 075 75 000 22 Z Stainless Steel Heat Exchanger Low NO a
6. Important Directions 1 Keep the furnace area clear and free of combustible material gasoline and other flammable vapors 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 throughou
7. WARNING Product contains fiberglass wool Disturbing the insulation in this product during installation maintenance or repair will expose you to fiber glass wool Breathing this may cause lung can cer Fiberglass wool is known to the State of California to cause cancer Fiberglass wool may also cause respiratory skin and eye irritation To reduce exposure to this substance or for further information consult material safety data sheets available from address shown below or contact your supervisor P O Box 799900 Dallas TX 75379 9900 AWARNING If overheating occurs or if gas supply fails to shut off shut off the manual gas valve to the appliance before shutting off electrical supply AWARNING 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 of the control system and any gas control which has been under water 1 COMBUSTION AIR BLOWER 2 PRESSURE SWITCH 3 BURNERS 4 HEAT EXCHANGER 5 GAS VALVE 6 CONTROL BOARD 7 BLOWER ACAUTION Before attempting to perform any service or mainte nance turn the electrical power to unit OFF at dis connect switch AIMPORTANT Any additions changes or conversions required in order for the appliance to satisfactorily meet the ap plication needs must be made by a qualified service technician using factory specified and approved parts
8. When unit is initially started steps 1 through 11 may need to be repeated to purge air from gas line 12 If the appliance still will not operate follow the instructions To Turn Off Gas To Unit and call your service technician or gas supplier To Turn Off Gas To Unit 1 Set thermostat to lowest setting 2 Turn off all electrical power to unit if service is to be performed 3 Remove control access panel 4 Switch lever on White Rodgers gas valve to OFF turn knob on Honeywell valve clockwiseg to OFF Do not force 5 Replace control access panel All F8AUH filters must be installed external to the unit They can be ordered as an optional accessory item Filters should be inspected monthly Clean or replace the filters when necessary to ensure proper furnace operation See table 1 for filter sizes Replacement fil ters for FEAUH 045 060 075 units must have a mini mum velocity rating of 400 FPM Replacement filters for FEAUH 100 120 units require a minimum velocity rating of 625 FPM Figures 4 and 5 show possible filter locations TABLE 1 Model Number Filter Size inches mm F8AUH 045 060 075 16 X 20 X 1 406 X 508 X 25 F8AUH 100 120 20 X 20 X 1 508 X 508 X 25 UPFLOW FURNACE BOTTOM RETURN AIR FIGURE 4 UPFLOW FURNACE SIDE RETURN AIR FIGURE 5 Blower Check and clean blower wheel for any debris Blower motor is prelubricated for extended bearing life No further
9. ed 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 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
10. lve Operation See figures 2 and 3 1 STOP Read the safety information at the beginning of this section 2 Set thermostat to lowest setting See figure 1 THERMOSTATS x _ 40 98 2 2 0 win CoD FIGURE 1 3 Turn off all electrical power to appliance 4 This appliance Is equipped with an ignition device which automatically lights the burner Do not try to light the burner by hand 5 Remove control access panel 6 White Rodgers 36E Gas Valve Switch gas valve lever to OFF do not force See figure 2 Honeywell VR8205 Gas Valve Turn knob on gas valve clockwiseg to OFF Do not force See figure 3 WHITE RODGERS 36E SERIES GAS VALVE GAS VALVE SHOWN IN OFF POSITION FIGURE 2 HONEYWELL VR8205 SERIES GAS VALVE GAS VALVE SHOWN IN OFF POSITION FIGURE 3 7 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 8 White Rodgers 36E Gas Valve Switch gas valve lever to ON Do not force Honeywell VR8205 Gas Valve Turn knob on gas valve counterclockwise4 to ON Do not force 9 Replace control access panel 10 Turn on all electrical power to unit 11 Set thermostat to desired setting NOTE
11. t the house 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 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 monoxide gas Because of this the use of a carbon monoxide detector in your home is recommended even if you do not own gas appliances Reliable detectors are available at reason able retail prices Contact your 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 Annual inspection and maintenance of this appliance is strongly recommended Contact your dealer for
12. that electrical disconnect switches are ON 2 Are access panels securely in place 3 Check room thermostat for proper setting 4 Replace any blown fuses or reset circuit breakers 5 Gas valve should be ON 6 Air filter should not be plugged limiting air flow 7 Is gas turned on at meter 8 Is manual main shut off valve open To keep your gas heating system in peak operating condition year after year contact your dealer about a planned service program Safety Precautions If you discover any of the following shut down your unit and contact your 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 example 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 e 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 exaggerat
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