Lennox EL280UH045E36A Service Literature Download Page 20 | Manualshive

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Page 20

HEATING COMPONENTS

Ignitor

Burners

Sensor

Gas Valve

Manifold and Gas Orifices

Rollout Switch

FIGURE 13

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Summary of Contents for EL280UH045E36A

Page 1: ...ling applications up to 5 tons Refer to Engineering Handbook for proper sizing Units are factory equipped for use with natural gas Kits are available for conversion to LPG operation EL280UHE X model units are equipped with the SureLight two stage integrated control EL280UHE X unit meets the California Nitrogen Oxides NOx Standards and California Season al Efficiency requirements All units use a re...

Page 2: ... and according to FTC labeling regulations Isolated combustion system rating for non weatherized furnaces SPECIFICATIONS Gas Heating Performance Model No EL280UH090E36B EL280UH090E48B Model No Low NOx EL280UH090XE48B 1 AFUE 80 80 High Fire Input Btuh 88 000 88 000 Output Btuh 70 000 69 000 Temperature rise range F 35 65 30 60 Gas Manifold Pressure in w g Nat Gas LPG Propane 3 5 10 0 3 5 10 0 Low F...

Page 3: ... Heating 0 5 0 5 Cooling 0 5 0 5 Connections in Flue connection in round 4 4 Gas pipe size IPS 1 2 1 2 Indoor Blower Wheel nominal diameter x width in 10 x 10 11 1 2 x 10 Motor output hp 3 4 1 Tons of add on cooling 3 4 4 5 Air Volume Range cfm 865 1780 1100 2200 Electrical Data Voltage 120 volts 60 hertz 1 phase Blower motor full load amps 8 2 10 Maximum overcurrent protection 15 15 Shipping Data...

Page 4: ... 20A65 20A65 Remote Outdoor Temperature Sensor X2658 X2658 X2658 Furnace Twinning Kit 16W72 16W72 16W72 FILTERS 1 Air Filter and Rack Kit Horizontal end 87L95 87L96 87L97 Size of filter in 14 x 25 x 1 18 x 25 x 1 20 x 25 x 1 Side Return Single 44J22 44J22 44J22 Ten Pack 66K63 66K63 66K63 Size of filter in 16 x 25 x 1 16 x 25 x 1 16 x 25 x 1 NIGHT SERVICE KIT Night Service Kit 17B59 17B59 17B59 VEN...

Page 5: ...00 1375 340 1350 240 1110 190 970 93 780 50 0 10 1350 346 1325 254 1100 194 940 104 725 57 0 20 1330 346 1310 264 1080 200 895 113 680 64 0 30 1315 353 1280 272 1060 204 860 118 610 70 0 40 1300 368 1250 283 1040 212 810 125 550 76 0 50 1285 369 1220 293 1010 222 765 132 510 78 0 60 1260 384 1190 301 975 227 725 140 460 83 0 70 1240 391 1150 314 950 236 680 147 400 89 0 80 1210 399 1120 319 915 24...

Page 6: ...0 339 1125 283 1025 246 865 203 EL280UH110E60C PERFORMANCE Less Filter External Static Pressure in w g Air Volume Watts at Different Blower Speeds Bottom Return Air Side Return Air from Both Sides or Return Air from Bottom and One Side Single Side Return Air Air volumes in bold over 1800 cfm require Optional Return Air Base and field fabricated transition to accommodate 20 x 25 x 1 in air filter i...

Page 7: ...ustion Air Inducer Gas Valve and Manifold Assembly Limit Switch under collector box Collector Box Heat Exchanger Indoor Blower and Motor Assembly installed in cabinet Make Up Box Constant Torque Indoor Blower Motor removed from cabinet Two Stage Integrated Control Figure 1 ...

Page 8: ...operable simply replace entire control Can cause injury or death Unsafe operation will result if repair is attempted 4 Integrated Control A92 Units are equipped with the SureLight two stage inte grated control The system consists of a ignition blower control figures 4 and 5 with control pin designations in tables 1 and 2 and ignitor The control and ignitor work in combination to ensure furnace ign...

Page 9: ...the DIP switch to ON for use with a single stage thermostat While in the single stage thermostat mode the burn ers will always fire on first stage heat The com bustion air inducer will operate on low speed and indoor blower will operate on low heat speed The unit will switch to second stage heat after a recog nition period DIP switch 2 labeled SECOND STAGE DELAY is factory set in the OFF position ...

Page 10: ...COOL SIGNAL Y2 THERMOSTAT 2ND STAGE COOL SIGNAL O THERMOSTAT SIGNAL TO HEAT PUMP REVERSING VALVE L NOT USED DH NOT USED HUM UNPOWERED NORMALLY OPEN DRY CONTACTS LI 120 VAC INPUT TO CONTROL ACC 120 VAC OUTPUT TO OPTIONAL ACCESSORY NEUTRALS 120 VAC NEUTRAL 3 16 QUICK CONNECT TERMINALS FLAME SENSE SIGNAL HI COOL 24VAC HI HEAT 24VAC LO COOL 24VAC LO HEAT 24VAC PARK PARK COMMON 24VAC Flame Sense S4 DIP...

Page 11: ... 1 2 3 4 5 6 ON SureLight W1W2 G Y2 Y1 C C DH L O DS R W1 W2 G Y2 Y1 C C R L DH 7 PROTECTIVE PLASTIC FILM ON DIP SWITCHES MAY BE REMOVED FOR EASE IN SETTING OF DIP SW CUT ON BOARD LINK SOLDER TRACE COMPLETELY THROUGH BOTH LAYERS ON THE CONTROL BOARD LINKS CUT IN ERROR INSTALL A JUMPER ON THE APPROPRIATE TERMINALS ON THE TERMINAL STRIP 1 ON ON ON ON 90 SECOND HTG BLOWER OFF DELAY 1 2 3 4 5 6 7 ON 1...

Page 12: ...robbing equipment connected to system May require installation of larger VA transformer to be installed in furnace air handler Clears after fault recovered E117 Poor ground detected Warning only Provide proper grounding for unit Check for proper earth ground to the system Warning only will clear 30 seconds after fault recovered No change implies the display will continue to show whatever is curren...

Page 13: ...triction Resumes normal operation after fault is cleared E225 High pressure switch failed open Check pressure inches w c of high pressure switch closing on heat call Measure operating pressure inches w c Inspect vent and combustion air inducer for correct operation and restriction Resumes normal operation after fault is cleared E226 High pressure switch failed closed Check operation of high pressu...

Page 14: ...erating pressure inches w c Inspect vent and combustion air inducer for correct operation and restriction Clears when heat call finishes successfully E273 Soft lockout Exceeded maximum number of recycles Last recycle due to flame failure Check micro amperes of flame sensor using control diagnostics or field installed mode Clean or replace sensor Measure voltage of neutral to ground to ensure good ...

Page 15: ...econds The blower off delay affects comfort and is adjustable to satisfy individual applications Adjust the blower off de lay to achieve a supply air temperature between 90 and 110 F at the exact moment that the blower is de ener gized Longer off delay settings provide lower supply air temperatures shorter settings provide higher supply air temperatures Table 5 provides the blower off timings that...

Page 16: ...oubleshooting the Motor Troubleshooting the motor is an easy process Follow steps below 1 Shut off power to unit 2 Remove input plugs P48 and P49 from motor See figure 8 for troubleshooting procedure If correct voltage is present in tests 1 and 2 and motor is not operating properly replace motor The motor is not field repairable If replacing the indoor blower motor or blower wheel is necessary pla...

Page 17: ...eed tap used for continuous fan 1 2 3 4 or 5 on input plug P49 If 24 volts is not present problem may be up stream of plug P49 Proceed to test 4 Multi Meter set to VAC 12 0 12 0 24 Multi Meter set to VAC ent problem is with the harness If voltage is not present problem may be may be with the integrated control Check for 120 volts across terminals L1 and Neutrals on the integrated control If voltag...

Page 18: ...oximately the same resistance within an ohm 3 Check to see if the blower wheel spins freely Motor Test Figure 11 Motor Module Installation All replacement motor control modules look similar how ever each module is designed for a specific motor size It is very important to make sure that you are using the correct replacement motor control module USE OF THE WRONG MOTOR CONTROL MODULE MAY RESULT IN U...

Page 19: ...ps are located on the valve A regulator adjustment screw is located on the valve LPG change over kits are available from Lennox Kits include burner orifices 4 Flame Rollout Switches S47 The EL280UHE X is equipped with two rollout switches See figure 13 for location The limits are a N C SPST manual reset limit When S47 senses rollout the circuit breaks and the ignition control immediately stops ign...

Page 20: ...Page 20 HEATING COMPONENTS Ignitor Burners Sensor Gas Valve Manifold and Gas Orifices Rollout Switch FIGURE 13 ...

Page 21: ... thermostat contacts to cycle system 7 When main burners are in operation for two minutes take reading TABLE 9 Flame Signal in Microamps Normal Low Drop Out 2 6 or greater 2 5 or less 06 Measuring Flame Signal upflow furnace shown Set dial to measure DC microamps To Flame Terminal DIGITAL METER Red Collar Indicates Positive Leads To Control Sensor Terminal Flame Sensor Flame Sensor Wire Integrated...

Page 22: ...ck resistance of the ignitor Reading should be betwenn 39 and 70 ohms If reading is correct then there is a problem with the wiring between the jack plug anf the control If reading is not correct the issue is the ignitor Meter set to ohms Test 3 Checking voltage to ignitor Insert meter probes into terminals 1 and 5 use small diameter probes in order to not damage plug Check voltage during 20 secon...

Page 23: ...mbustion air inducer orifice bracket See figure 16 The switch is connected to the combustion air inducer housing by means of a flexible silicone hose It monitors negative air pressure in the combustion air in ducer housing The switches are a single pole single throw proving switch electrically connected to the integrated control The pur pose of the switch is to prevent burner operation if the comb...

Page 24: ... switch should be above the combustion air in ducer in all positions then reinstall the mounting screws See unit Installation Instructions for more detail IMPORTANT The combustion air pressure switch must be moved for horizontal discharge air left position FLOW AIR vent pipe In all positions route the wires away from moving parts and the heat of the inducer motor to prevent damage to the wires The...

Page 25: ...etting 2 Turn off all electrical power to unit if service is to be performed 3 Remove access panel 4 Move switch on valve to OFF Do not force 5 Replace access panel Failure To Operate If the unit fails to operate check the following 1 Is the thermostat calling for heat 2 Are access panels securely in place 3 Is the main disconnect switch closed 4 Is there a blown fuse or tripped circuit breaker 5 ...

Page 26: ...nifold pressure are made as verification of proper regulator adjustment Manifold pressure for the EL280UHE X can be measured at any time the gas valve is open and is supplying gas to the unit IMPORTANT For safety connect a shut off valve between the manometer and the gas tap to permit shut off of gas pressure to the manometer The gas valve is factory set and should not require adjust ment All gas ...

Page 27: ... 10 0 4 5 10 0 4 5 10 0 11 0 13 0 070 Natural 1 7 3 5 1 6 3 4 1 7 3 5 4 5 13 0 LP propane 3 4 5 10 0 4 5 10 0 4 5 10 5 11 0 13 0 090 Natuarl 1 7 3 5 1 5 3 2 1 7 3 5 4 5 13 0 LP propane 3 4 5 10 0 4 5 10 0 4 5 10 0 11 0 13 0 110 Natural 1 7 3 5 1 5 2 8 1 7 3 5 4 5 13 0 LP propane 3 4 5 10 0 4 5 10 0 4 5 10 0 11 0 13 0 1 This is the only permissible derate for these units 2 Natural gas high altitude...

Page 28: ...tes a poor or partial ground Compare the readings to the table below If the readings exceed the maximum shown in table 16 make repairs before operating the furnace 2 In addition measure the AC voltage from Line Hot to Line Neutral spade terminals on the integrated control See figure 20 This voltage should be in the range of 97 to 132 Vac TABLE 16 Furnace Status Measurement VAC Expected Maximum Pow...

Page 29: ... ________ Return Duct Temperature _ _____ Temperature Rise ________ SUPPLY AIR Temperatures RETURN AIR FIGURE 21 C External Static Pressure 1 Tap locations shown in figure 22 2 Punch a 1 4 diameter hole in supply and return air plenums Insert manomter hose flush with inside edge of hole or insulation Seal around the hose with permagum Connect the zero end of the manometer to the discharge supply s...

Page 30: ... unobstructed to provide combustion air 10 Inspect the furnace venting system to make sure it is in place structurally sound and without holes corrosion or blockage Vent system must be free and clear of obstructions and must slope upward away from the furnace Vent system should be installed per the National Fuel Gas Code 11 Inspect the furnace return air duct connection to ensure the duct is seale...

Page 31: ...eam Begin from the burner opening on each clam Steam must not exceed 275 F 12 To clean burners run a vacuum cleaner with a soft brush attachment over the face of burners Visually inspect inside the burners and crossovers for any blockage caused by foreign matter Remove any blockage Figure 23 shows burner detail 13 To clean the combustion air inducer visually inspect and using a wire brush clean wh...

Page 32: ...old And Gas Valve Retention Rings Cross Over Ignitor Sensor Rollout Switches Gasket Collector Box Orifice Plate Flue Transition Pressure Switch Combustion Air Inducer FIGURE 23 EL280UHE X NOx INSERTS NOx Insert FIGURE 24 Remove 5 screws if necessary either side of cabinet 1 2 3 4 5 FIGURE 25 ...

Page 33: ...Page 33 VII Wiring and Sequence of Operation EL280UH X E Schematic Wiring Diagram FIGURE 26 ...

Page 34: ...ized on low fire first stage and ignition occurs At the same time the control module sends a signal to begin an indoor blower 30 second ON delay When the delay ends the indoor blower motor is ener gized on the low fire heating speed the HUM contacts close energizing the humidifier and 120V ACC terminal is energized The furnace will continue this operation as long as the thermostat has a first stag...

Page 35: ...nergized on the low fire heating speed and the HUM contacts are energized The integrated control also initiates a second stage on delay factory set at 7 minutes adjustable to 12 minutes 5 If the heating demand continues beyond the secondstage on delay the integrated control energizes the combustion air inducer at high speed The control also checks the high fire second stage pressure switch to make...

Page 36: ... CUT ANY ON BOARD LINKS S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT 1 Heat 2 Cool NOTE Use DIP switch 2 to set second stage heat ON delay OFF 7 minutes ON 12 minutes ON CUT ON BOARD LINK W915 2 STAGE COMPR S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT 1 Heat 2 Cool with t stat with humidity control NOTE Use DIP switch 2 to set second stage heat ON delay OFF 7 minutes ON 12 minutes ON CUT ON BOARD LINK W...

Page 37: ...URNACE TERM STRIP OUTDOOR UNIT 2 Heat 2 Cool with t stat with humidity control OFF CUT ON BOARD LINK W915 2 STAGE COMPR CUT ON BOARD LINK W914 DEHUM OR HARMONY S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT o 2 Heat 1 Cool with t stat with humidity control OFF CUT ON BOARD LINK W914 DEHUM OR HARMONY S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT o 2 Heat 1 Cool OFF DO NOT CUT ANY ON BOARD LINKS S1 T STAT FU...

Page 38: ...P T STAT FURNACE TERM STRIP HEAT PUMP 67M41 Y H L Y2 D B L Y2 T T outdoor sensor Dual Fuel Two Stage Heat Pump ComfortSense thermostat w bilities Capable of 2 stage gas heat control OFF CUT ON BOARD LINK W951 HEAT PUMP CUT ON BOARD LINK W915 2 STAGE COMPR FURNACE TERM STRIP HEAT PUMP out blue 67M41 H L Y2 D B L Y2 T T outdoor sensor T STAT Connect W1 to W1 ONLY if using defrost tempering kit 67M41...

Page 39: ...MONY T STAT FURNACE TERM STRIP HEAT PUMP 67M41 Y H L Y2 D B L Y2 T T outdoor sensor Dual Fuel Two Stage Heat Pump ComfortSense thermostat w bilities Capable of 2 stage gas heat midification OFF CUT ON BOARD LINK W914 DEHUM OR HARMONY CUT ON BOARD LINK W951 HEAT PUMP CUT ON BOARD LINK W915 2 STAGE COMPR T STAT FURNACE TERM STRIP HEAT PUMP 67M41 H L Y2 D B L Y2 T T outdoor sensor Y2 out blue Connect...

Page 40: ...FF ON FOR 3 SEC MINIMUM NO YES FIRST LOW STAGE PRESSURE SWITCH CONTACTS OPEN NO GAS VALVE OFF COMBUSTION AIR INDUCER OFF INDOOR BLOWER OFF CONTROL REMAINS UNTIL PRESSURE SWITCH IS DETECTED OPEN STATUS ERROR CODE 2 4 YES GAS VALVE OFF COMBUSTION AIR INDUCER OFF INDOOR BLOWER OFF CONTROL WILL NOT ATTEMPT SECOND STAGE OPERATION DURING THIS HEAT DEMAND FIRST STAGE OPERATION WILL BE ATTEMPTED STATUS ER...

Page 41: ... 19 microamps GAS VALVE OFF COMBUSTION AIR INDUCER ON INDOOR BLOWER OFF STATUS LED HEARTBEAT HAS CONTROL FAILED TO SENSE FLAME FOR FIVE CONSECUTIVE TRIES DURING A SINGLE HEAT DEMAND YES THERMOSTAT CALLS FOR HEAT STATUS LED HEARTBEAT Refer to box A on previous page YES FLAME PRESENT NO HAS CONTROL RESET IGNITION SEQUENCE FOUR 4 TIMES WATCHGUARD MODE STATUS ERROR CODE 4 3 YES CONTINUED ON NEXT PAGE ...

Page 42: ...IED GAS VALVE OFF COMBUSTION AIR INDUCER OFF FOLLOWING POST PURGE INDOOR BLOWER OFF WITH DELAY STATUS LED PULSE YES SECOND STAGE HEAT DEMAND SECOND STAGE HEAT DEMAND REQUIRED NO SECOND STAGE PRESSURE SWITCH CLOSED ABNORMAL FLASH CODE NOTE IF SECOND STAGE PRESSURE SWITCH WAS ORIGINALLY FOUND CLOSED ABNORMAL CODE WILL FLASH SECOND STAGE PRESSURE SWITCH CLOSED AT BEGINNING OF HEAT DEMAND STATUS ERROR...

Page 43: ...E YES YES FIRST AND SECOND STAGE HEAT DEMAND SATISFIED SIMULTANEOUSLY STATUS LED HEARTBEAT YES GAS VALVE OFF COMBUSTION AIR INDUCER OFF AFTER 5 SECOND LOW SPEED POST PURGE PERIOD INDOOR BLOWER OFF DELAY INITIATED ON LOW HEAT SPEED STATUS LED HEARTBEAT DEMAND FOR HEAT SATISFIED POWER ON STAND BY STATUS LED PULSE YES SECOND STAGE HEAT DEMAND SATISFIED STATUS LED HEARTBEAT NO GAS VALVE COMBUSTION AIR...

Page 44: ... GROUND YES NO INDOOR BLOWER ENERGIZED ON FIRST STAGE COOL SPEED AFTER 2 SECOND DELAY FIRST STAGE DEMAND FOR COOL SATISFIED NO THERMOSTAT CALLS FOR SECOND STAGE COOL COMPRESSOR AND CONDENSER FAN DE ENERGIZED INDOOR BLOWER DE ENEGIZED YES INDOOR BLOWER RAMPS UP TO SECOND STAGE COOL SPEED SECOND STAGE DEMAND FOR COOL SATISFIED YES UNIT RETURNS TO FIRST STAGE COOL SIGNAL IMPROPER GROUND AT LED CONTRO...

Page 45: ...GE HEAT DEMAND SATISFIED YES NO THERMOSTAT CALLS FOR SECOND STAGE HEAT YES INDOOR BLOWER SWITCHES TO HIGH HEAT SPEED AFTER 30 SECOND RECOGNITION PERIOD SECOND STAGE HEAT DEMAND SATISFIED YES YES INDOOR BLOWER RAMPS DOWN TO LOW HEAT SPEED INDOOR BLOWER RAMPS TO FIRST STAGE COOLING SPEED AFTER A 2 SECOND DELAY FIRST STAGE COOL DEMAND SATISFIED YES NO SECOND STAGE COOL DEMAND SATISFIED INDOOR BLOWER ...

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