Lennox International Inc. ML180UHE User's Manual
Contents
1. Turning Off Gas to the Unit and call your licensed professional service technician or equivalent Turning Off Gas to the Unit 1 Set the thermostat to the lowest setting 2 Turn off all electrical power to the unit if service is to be performed 3 Remove the upper access panel 4 Move switch on gas valve OFF 5 Replace the upper access panel All ML180UHE filters are installed external to the unit Fil ters should be inspected monthly Clean or replace the fil ters when necessary to ensure proper furnace operation Replacement filters must be rated for high velocity airflow Table 1 lists recommended filter sizes A filter must be in place when the unit is operating TABLE 1 Furnace Cabinet Width Side Return Bottom Return 14 1 2 16 X 25 X 1 1 14 X25 X 1 1 17 1 2 16 X 25 X 1 1 16 X 25 X 1 1 16X25X1 1 20X25 X11 1 24 1 2 16 X 25X 1 2 24 X25 X1 1 Maintenance A licensed professional service technician or equivalent should inspect the complete system each season heating and cooling The following maintenance procedures should only be conducted by a licensed professional ser vice technician or equivalent Do not attempt to service the unit in any way AWARNING ELECTRICAL SHOCK FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in dangerous operation serious injury death or property damage Improper servicing could result in dangerous opera2. LENNOX USER S INFORMATION ENNOXD MANUAL Dallas Texas USA 506733 01 05 2011 ML180UHE SERIES GAS FURNACE TP Technical Publications Litho U S A A WARNING FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exact ly could result in serious injury death or property damage WHAT TO DO IF YOU SMELL GAS e Do not try to light any appliance e Do not touch any electrical switch do not use any phone in your building Leave the building immediately Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other ap pliance Installation and service must be e Immediately call your gas supplier from a performed by a qualified installer neighbor s phone Follow the gas supplier s service agency or the gas supplier instructions e If you cannot reach your gas supplier call the fire department 05 11 506733 01 NON T NNN A ML180UHE Parts Identification TOP CAP PRESSURE SWITCH COMBUSTION AIR INDUCER UPPER ACCESS PANEL BURNERS BLOWER ACCESS PANEL HEAT EXCHANGER ASSEMBLY GAS VALVE AND MANIFOLD BLOWER MOTOR INTEGRATED CONTROL FIGURE 1 NOTE This manual is the property of the homeowner and must be left with the equipment user Notice to Homeowner This furnace is equipped with safety devices that protect you and your property If one or more of these devices is activated furnace operation will stop If your
3. Main burner cluster Main burner orifices Pressure switch Ignitor Primary limit control Flame rollout switches
4. tion serious injury death or property damage Before servicing disconnect all electrical power to furnace When servicing controls label all wires prior to dis connecting Take care to reconnect wires correctly Verify proper operation after servicing Venting System A WARNING Asphyxiation Hazard The exhaust vent for this furnace must be leak free and must be securely connected to the furnace flue collar at all times For your safety and to fulfill the terms of the limited warranty a licensed professional service technician or equivalent must annually inspect this furnace and its vent system Page 5 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 Inspect the furnace for obvious signs of deterioration Inspect the furnace venting system to make sure it is in place physically sound and without holes corrosion or blockage Vent pipe must be clear and free of obstructions and must slope upward away from the furnace Inspect the furnace return air duct connection to ensure duct is sealed to the furnace 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 During a seasonal check the service technician will
5. con duct a combustion analysis The technician will also in spect the indoor blower burner flames electrical connec tions and the venting system Blower Check the blower wheel for debris and clean if necessary The blower motors are prelubricated for extended bearing life No further lubrication is needed AWARNING The blower access panel must be securely in place when the blower and burners are operating Gas fumes which could contain carbon monoxide can be drawn into living space resulting in personal inju ry or death Burner Flame A CAUTION To ensure proper operation a licensed professional service technician or equivalent should check the burner flame and conduct a combustion analysis annually Electrical 1 Check all wiring for loose connections 2 Check for the correct voltage at the furnace furnace operating Check amp draw on the blower motor with blower ac cess panel in place Motor Nameplate wo 1 Actual Service Reminder Call your Lennox service technician if the unit will not oper ate 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 which will limit air flow 6 Is gas turned on at meter 7 Is manual main shut off va
6. speci fied and approved parts AWARNING Improper installation adjustment alteration service or maintenance can cause property damage person al injury or loss of life Installation and service must be performed by a licensed professional installer or equivalent a service agency or the gas supplier Safety Instructions 1 Keep the furnace area clear and free of combustible material gasoline and other flammable vapors and liquids If it is installed in an insulated area the furnace must be kept free of insulating material Insulating ma terial may be combustible Page 3 2 DO NOT obstruct air flow to unit Unit must receive an unobstructed flow of combustion and ventilating air DO NOT block or obstruct air openings on the furnace or air openings to the area in which the furnace is installed Take care to maintain established clear ances surrounding the furnace 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 fur nace or any other gas appliance ie a water heat er is installed When return air is drawn from a room a negative pressure is created in the room If a gas ap pliance 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 incompl
7. 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 follow ing 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 water Vent pipe Must be inspected for signs of water damaged or sagging pipe or disconnected joints Unit appearance Must be inspected for rust dirt signs of water burnt or damaged wires or components Blower access door Must be properly in place and pro vide a seal between the return air and the room where the furnace is installed Return air duct Must be properly attached and provide an air seal to the 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 nec essary 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
8. ete combustion and the formation of carbon monoxide gas This toxic gas might then be distributed throughout the house by the furnace duct system A WARNING The blower door must be securely in place when the blower and burners are operating Gas fumes which could contain carbon monoxide can be drawn into the living space resulting in personal injury or death 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 pressure and gas flow rate adequate combustion air and proper venting A WARNING Carbon monoxide gas is invisible odorless and toxic Exposure to carbon monoxide gas can cause personal inju ry and even death to all occupants including pets Any item that is powered by or gives off heat from a combustion pro cess including lawn mowers automobiles and fireplaces has the potential to produce carbon monoxide gas Because of this Lennox recommends the use of a carbon monox ide detector in your home even if you do not own gas appliances Reliable detectors are available at reasonable retail prices Contact your 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 perfor
9. explosion Placing the ML180UHE furnace into operation ML180UHE units are equipped with an ignition system Do not attempt to manually light burners on this furnace Each time the thermostat calls for heat the burners will automatically light The ignitor does not get hot when there is no call for heat on units with this ignition system Page 4 Operating the Gas Valve Figure 2 1 STOP Read the safety information at the beginning of this section 2 Set the thermostat to the lowest setting 3 Turn off all electrical power to the unit 4 This furnace is equipped with an ignition device which automatically lights the burners Do not try to light the burners by hand 5 Remove the upper access panel 6 Move switch on gas valve to OFF See figure 2 7 Wait five minutes to clear out any gas If you then smell gas STOP Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instruc tions If you do not smell gas go to next step 8 Move switch on gas valve to ON See figure 2 MANIFOLD PRESSURE ADJUSTMENT MANIFOLD PRESSURE PORT GAS VALVE SHOWN IN ON POSITION FIGURE 2 9 Replace the upper access panel 10 Turn on all electrical power to to the unit 11 Set the thermostat to desired setting NOTE When unit is initially started steps 1 through 11 may need to be repeated to purge air from gas line 12 If the appliance will not operate follow the section
10. home is left unattended for an extended period of time equipment op Page 2 eration must be checked periodically If this is not possible the water supply to the house should be shut off and the pipes should be drained This will prevent problems associ ated with a NO HEAT condition frozen pipes etc A CAUTION Before attempting to perform any service or mainte nance turn the electrical power to unit OFF at the disconnect switch A WARNING Do not set thermostat below 60 F 16 C in heating 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 A WARNING If overheating occurs or if gas supply fails to shut off shut off the manual gas valve to the furnace before shutting off electrical supply AWARNING Do not use this furnace if any part has been under water A flood damaged furnace is extremely dan gerous Attempts to use the furnace can result in fire or explosion Immediately call a licensed pro fessional service technician or equivalent to in spect the furnace and to replace all gas controls control system parts and electrical parts that have been wet or to replace the furnace if deemed neces sary NOTICE Any additions changes or conversions required in order for the appliance to satisfactorily meet the ap plication needs must be made by a licensed profes sional installer or equivalent using factory
11. innocently stored next to the furnace may obstruct the combustion air supply This could cause incomplete combustion and the production of car bon monoxide gas Repair Parts List The following repair parts are available through Lennox dealers When ordering parts include the complete furnace model number listed on the CSA International nameplate Example ML180UHE045P36A All service must be done by a li censed professional installer or equivalent a service agency or the gas supplier Cabinet Parts Heating access panel Blower access panel Top Cap Control Panel Parts Transformer Integrated control Door interlock switch Blower Parts Blower wheel Motor Motor mounting frame Motor power choke 3 4 and 1 hp Blower housing cutoff plate AWARNING 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 Cal ifornia 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 Lennox Industries Inc P O Box 799900 Dallas TX 75379 9900 Page 7 Heating Parts Flame Sensor Heat exchanger assembly Gas manifold Combustion air inducer Gas valve
12. lve open Record the model and serial number of the furnace These numbers are on the unit nameplate which is located on the blower deck below the combustion air inducer Serial Number Model Number Safety Precautions If you discover any of the following shut down your unit and contact a Lennox dealer for an inspection by a licensed professional service technician or equiva lent 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 unfa miliar noises If you smell any unusual odors your unit may be operat ing improperly For example units can give off unfamil iar odors if components are required to operate in ab normal conditions Look for visible signs of a malfunctioning unit Examples include unusual amounts of condensate on windows in side 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 monoxide 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 Page 6 Your vigilance may pay off in early detection of a problem before either personal injury or property
13. mance 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 criti cal for your safety and the satisfactory operation of the product Lennox strongly recommends annual in spection and maintenance of this appliance Contact your Lennox dealer for an inspection by a licensed profes sional service technician or equivalent A DANGER Danger of explosion There are circumstances in which odorant used with LP propane gas can lose its scent In case of a leak LP propane gas will settle close to the floor and may be difficult to smell An LP propane leak detector should be installed in all LP applications Do not attempt to bleed the gas lines of air Call your local gas provider AWARNING If you do not follow these instructions exactly a fire or explosion may result causing property damage personal injury or death BEFORE PLACING THE UNIT INTO OPERATION 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 The gas valve on the ML180UHE will be equipped with a gas control switch Use only your hand to move the switch Never use tools If the switch will not move by hand do not try to repair it Call a licensed professional service technician or equivalent Force or attempted re pair may result in a fire or
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