Lennox Hearth 90UGF User's Manual
Contents
1. LEWWUX USER S INFORMATION MANUAL 1997 Lennox Industries Inc Dallas Texas 900 SERIES GAS FURNACE A WARNING If the information in this manual is not followed exactly a fire or explosion may result causing property damage APPROVED personal injury or loss of life WHAT DO IF YOU SMELL GAS Do not store or use gasoline or other Do not try to light any appliance flammable vapors and liquids in the e Extinguish any open flames vicinity of this or any other appliance not touch any electrical switch do not use any phone in your building e Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service must be per formed by a qualified installer service agency or the gas supplier 90UGF PARTS IDENTIFICATION HEAT EXCHANGER FRESH AIR INTAKE ASSEMBLY CONNECTION TOP CAP FLUE COLLAR BURNERS FLAME SIGHT GLASS CABINET COMBUSTION AIR PROVING PRESSURE SWITCH BURNER PANEL N ZF BOX UPPER ACCESS ey T GAS COMBUSTION AIR MANIFOLD BLOWER GAS ee eA VALVE DOOR eco INTERLOCK SWITCH YO Sy CONDENSATE 5 SS BLOWER MOTOR CONTROL BLOWER ACCESS DOOR BOX SURE2. a few minutes to establish normal burning condi tions Check burner flame by observation Flame should be predominantly blue in color and strong in appearance Contact your Lennox dealer for a periodic unit inspec tion by a qualified service technician SERVICE REMINDER Call your Lennox service technician if unit is inopera tive Before calling always check the following to be sure service is required 1 Check that electrical disconnect switches are ON 2 Check room thermostat for proper setting 3 Replace any blown fuses or reset circuit breakers 4 Gas valve should be ON 5 Air filter should not be plugged limiting air flow 6 Is gas turned on at meter 7 Is manual main shut off valve open 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 operating improperly For example units can give off unfamiliar odors if components are required to operate in abnormal conditions e Look for visible signs of a malfunctioning unit Ex amples include unusual amounts of condensate on windows inside your house visibly burnt com ponents or unusual dirt or rust accumulations on the vent pip
3. 4 gas valves turn knob on gas valve clockwiseg to OFF For White Rodg ers 36E gas valves move switch to OFF Do not force See figure 3 HONEYWELL VR8204 SERIES GAS VALVE GAS VALVE SHOWN IN OFF POSITION WHITE RODGERS 2 ropcers 36E GAS VALVE E FIGURE 3 7 Wait fifteen 15 minutes to clear out any gas If you then smell gas STOP Immediately call your gas supplier from a neighbor s phone Fol low the gas supplier s instructions If you do not smell gas go to next step 8 For Honeywell VR8204 gas valves turn knob on valve counterclockwise to ON For White Rodgers 36E gas valves move switch to ON 9 Replace upper access panel 10 Turn on all electrical power to unit 11 Set thermostat to desired setting NOTE When unit is first started steps 1 through 11 may need to be repeated to purge air from line GAS VALVE SHOWN IN OFF POSITION 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 upper access panel 4 Honeywell VR8204 gas valves turn knob on gas valve clockwise to OFF For White Rodg ers 36E gas valves move switch to OFF Do not force 5 Repla
4. LIGHT INTEGRATED CONTROL FIGURE 1 Page 2 WARNING Product contains fiberglass wool Disturbing the insulation in this product during installation maintenance or repair will expose you to fiberglass wool Breathing this may cause lung cancer 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 fur ther information consult material safety data sheets available from address shown below or contact your supervisor Lennox Industries Inc P O Box 799900 Dallas TX 75379 9900 A WARNING Do not set thermostat below 60 F 16 C in heat ing mode Setting thermostat below 60 F 16 C reduces the number of heating cycles Damage to the unit may occur that is not covered by the warranty WARNING If overheating occurs or if gas supply fails to shut off shut off the manual gas valve to the ap pliance before shutting off electrical supply A WARNING Do not use this furnace if any part has been underwater Immediately call a qualified service technician to inspect the furnace and to replace any part of the control system and any gas con trol which has been under water A CAUTION Before attempting to perform any service or maintenance turn the electrical power to unit OFF at disconnect switch A IMPORTANT Any additions changes or conversions required in
5. ce upper access panel Page 4 FILTERS A filter must be in place any time the unit is opera tion The filter may be located in the unit optional kit or installed in a return air grille Ask your dealer to show you the filter location The filter should be inspected monthly and cleaned when necessary to assure proper furnace operation Filters used inside the 9OUGF series unit are available from Lennox and must be ordered separately These foam filters may be cleaned for reuse If replacement is necessary order Lennox part no 31J81 for 14 X 25 356 X 635mm filter for 90UGF 50 and 75 units and P 8 7831 for 20 X 25 508 X 635mm filter used with 90OUGF 100 and 125 units Use the following procedure to clean filter Refer to figure 1 In Unit Filter with Bottom Return Air 1 Turn off electric power to furnace 2 Remove blower access panel 3 Remove filter by pressing side filter clips and pulling filter up and out See figure 4 BOTTOM RETURN FILTER INSTALLATION REAR FILTER CLIP SIDE FILTER arso XRETURN AIR OPENIN FURNACE FURNACE FRONT BASE BOTTOM FIGURE 4 4 Clean filter with cold water and a mild soap Di rect water through filter in the opposite direction of air flow Remove all soap residue 5 Allow filterto dry then spray with filter handicoat er P 8 5069 available from your Lennox dealer prior to reinstallation 6 Place filter in bottom of blower co
6. e or in the unit e If you experience headache nausea fatigue or dizziness the cause could be exposure to carbon monoxide gas This is often misdiagnosed as the flu because symptoms are similar If you suffer from flu like symptoms that are exaggerated at home but seem to subside 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 be ing PLANNED SERVICE You should expect a service technician to check the following 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 unobstructed to provide combustion air Burners Must be inspected for rust dirt or signs of water Vent pipe Must be inspected for dirt signs of water damaged or sagging unsupported pipe or discon nected joints Unit appearance Must be inspected for dirt signs of water burnt or damaged wires or components Blower access door Must be properly in place and provide a seal between the return air and the room where the furnace is installed Return air duct Must be properly attached and pro vide an airtight seal to unit Operating performance Unit mu
7. ect the com plete system each season heating and cooling The following maintenance procedures should be con ducted by a qualified service technician Do not at tempt to service the unit in any way During a seasonal check the service technician will in spect the indoor blower the burner flame and the venting system Venting System Annually before heating season inspect furnace venting system heat exchanger and burners for corrosion deterioration or deposits of debris Re move any obstructions Inspect furnace venting system to make sure it is in place physically sound and without holes corro sion or blockage Vent connector must be in correct position sloped upward and be physically sound without holes or excessive corrosion Inspect furnace return air duct connection to ensure duct is sealed to the furnace and terminates outside the space containing the furnace Page 5 Inspect the physical support of the furnace to guaran tee that it is sound without sagging cracks or gaps around base and it maintains seal between base and support Inspect and clean the condensate traps and drain Blower Check and clean blower wheel for any debris Blower motor is pre lubricated for extended bearing life No further lubrication is needed Burner Flame CAUTION Using flame sight glass check burner flame periodically to ensure proper operation Burner Flame Start burner and allow it to operate for
8. im ited to correct gas pressure and gas flow rate ade quate combustion air and proper venting WARNING Carbon monoxide gas is invisible odorless 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 combus tion process including lawn mowers automobiles and fireplaces has the potential to produce carbon monoxide gas Because of this 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 na tional agencies and to operate safely when properly installed and maintained However the unit s perfor mance can be greatly impacted by the individual installation and the operating environment It is your responsibility to ensure that this appliance is main Page 3 tained Proper maintenance is critical for your safety and the satisfactory operation of the product Lennox strongly recommends annual inspection and mainte nance of this appliance Contact your independent Lennox dealer for an inspection by a qualified service technician LIGHTING INFORMATION AND OPERATION A WARNING If you do not follow these instructions exactly a fire or explosion ma
9. mpartment be neath rear filter clip Press down on filter sides Filter clips flex allowing filter to snap into place 7 Replace blower access panel A WARNING Blower door must be securely in place when blower and burners are operating Gas fumes which could contain carbon monoxide drawn into living space resulting in personal inju ry or death In Unit Filter with Side Return Air See Figure 5 1 Turn off electric power to furnace 2 Locate the filter door of the filter rack assembly 3 Using the filter door pins pull filter door with fil ter attached out of filter rack assembly Remove filter door from filter by pulling up on securing tabs 4 Clean filter with cold water and a mild soap Di rect water through filter in the opposite direction of air flow Allow filter to dry then spray with filter handicoater available from your Lennox dealer prior to reinstallation 5 Position filter door on end of filter so that the thumb tab side of the filter door is away from the furnace Check for correct air flow position Squeeze thumb tabs to secure filter to door 6 Guide filter and filter door into the filter rack installed onside offurnace Push door into filter rack until secure REMOVING REPLACING FILTER DOOR FILTER DOOR PIN pi aA A A FILTER DOOR FILTER FILTER DOOR PIN Nab FIGURE 5 SEASONAL INSPECTIONS A qualified service technician should insp
10. order for the appliance to satisfactorily meet the application needs must be made by a Lennox service technician using factory specified and ap proved parts IMPORTANT DIRECTIONS 1 Keep the furnace area clear and free of combus tible material gasoline and other flammable va pors and liquids If installed in an insulated area furnace must be kept free of insulating material Insulating material may be combustible 2 obstruct air flow to unit Unit must re ceive an unobstructed flow of combustion and ventilating air 3 NOT store chlorine or fluorine products near unit or introduce these products into the combus tion air These products can cause furnace corro sion 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 aroom 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 by the fur nace duct system Your furnace is a gas appliance It is critical that the gas supplied to the unit be completely burned to avoid the production of carbon monoxide gas Com plete combustion of the gas requires but is not l
11. st be observed dur ing 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 unsafe operation For instance items innocently stored next to the furnace may obstruct the combus tion air supply This could cause incomplete combus tion and the production of carbon monoxide gas Page 6
12. y 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 Unit may be equipped with either a gas control knob or lever Use only your hand to push in or turn the gas control knob or move the gas control lever Never use tools If the knob will not push in or turn or if lever will not move by hand do not try to repair it call a quali fied service technician Force or attempted repair may result in a fire or explosion To place 90UGF furnace into operation 90UGF units are equipped with a SureLightt ignition system Do not attempt to manually light these fur naces Each time thermostat calls for heat the burn ers will be automatically lit by the ignitor The ignitor does not get hot when there is no call for heat on units with the SureLight ignition system Gas Valve Operation Figure 3 1 STOP Read the safety information at the begin ning of this section 2 Set thermostat to lowest setting See figure 2 THERMOSTATS Za FIGURE 2 3 Turn off all electrical power to appliance 4 This appliance Is equipped with an ignition de vice which automatically lights the burners Do not try to light the burners by hand 5 Remove upper access panel 6 On Honeywell VR820
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