Daikin DC97MC, Service Instructions Manual

Page 1: ...ember 2016 This manual is to be used by qualified professionally trained HVAC technicians only Daikin does not assume any responsibility for property damage or personal injury due to improper service procedures or services performed by an unqualified person Copyright 2014 2016 Service Instructions ...

Page 2: ...PERTY DAMAGE PERSONAL INJURY OR DEATH IMPORTANT INFORMATION 2 4 PRODUCT IDENTIFICATION 5 8 ACCESSORIES 9 11 LIGHTING INSTRUCTIONS 12 PRODUCT DESIGN 13 24 OPERATION 25 47 SERVICE AND OPERATION 48 OPERATIONAL CHECKS 49 50 MAINTENANCE 51 SERVICING TABLE OF CONTENTS 52 SERVICING 53 61 TROUBLESHOOTING 62 66 STATUS CODES 67 WIRING DIAGRAM 68 ONLY PERSONNEL THAT HAVE BEEN TRAINED TO INSTALL ADJUST SERVIC...

Page 3: ...er assistance please contact CONSUMER INFORMATION LINE DAIKIN BRAND PRODUCTS TOLL FREE 1 855 770 5678 U S only email us at customerservice daikincomfort com fax us at 731 856 1821 Not a technical assistance line for dealers Outside the U S call 1 713 861 2500 Not a technical assistance line for dealers Your telephone company will bill you for the call ...

Page 4: ...16 El monóxido de carbono puede causar enfermedades severas como daño cerebral permanente ó muerte Las emisiones de monóxido de carbono pueden circular a través del aparato cuando se opera en cualquier modo B10259 216 RISQUE D EMPOISONNEMENT AUMONOXYDE DE CARBONE Cette ventilation est nécessaire pour éviter le danger d intoxication au CO pouvant survenir si un appareil produisant du monoxyde de ca...

Page 5: ...7 NOMINAL INPUT 060 60 000 Btuh 080 80 000 Btuh 100 100 000 Btuh 120 120 000 Btuh AIRFLOW CAPABILITY 0 5 ESP 3 1200 4 1600 5 2000 CABINET WIDTH B 17 1 2 C 21 D 24 1 2 ADDITIONAL FEATURES N Natural Gas X Low NOx PRODUCT TYPE D Daikin MAJOR REVISION A Initial Release MINOR REVISION A Initial Release COMMUNICATION FEATURE C Variable Speed ComfortNetTM ...

Page 6: ...tainless Steel Accessory Terminals EAC terminal HUM IN HUM OUT terminals Gas Line Entry Left or Right Revision Attributes First revision of 34 5 modulating up flow furnace MODEL DC97MC REV AA Equipment Type Daikin Brand Residential Gas Furnace Heating Stages Modulating 35 100 of rated input Cooling Stages Two Control Type ClimateTalk or Conventional 24 Volt Blower Motor Type 4 Wire Variable Speed ...

Page 7: ...AA Communicating Thermostat Kit Digitally communicating touchscreen thermostat a necessary part of any communicating system Designed for use with compatible Daikin Air Handlers or Furnaces and outdoor split AC or Heat Pump units This thermostat supports up to three stages of heat two stages of cooling dual fuel applications dehumidification filter maintenance reminders outdoor temperature display ...

Page 8: ... 97 upflow variable speed MVM 34 5 modulating gas furnaces This kit is intended to provide a location external to the furnace casing for installation of a permanent filter The rack is mounted over the indoor air blower compartment area of either side panel and provide filter retention as well as a location for attaching return air ductwork 0170K00000S N A Side Wall Only Concentric Vent Kit For use...

Page 9: ...X X DM97MC1205DN X X X X X X X X DC9 7MC060 3BN X X X X X X X X X DC9 7MC080 3BN X X X X X X X X X DC9 7MC080 4CN X X X X X X X X X DC9 7MC1005 CN X X X X X X X X Model Number 0170K00000S 0170K00001S DCVK 20 C CVENT2 DCVK 30 CVENT 3 DEHUM1 EFR02 LPLP03 LPM 09 Description Concentric Side Wall Vent Kit 3 Concentric Side Wall Vent Kit 2 Concentric Vent Kit 2 Concentric Vent Kit 3 Dehumidistat Externa...

Page 10: ...r vertical or horizontal vent termination The illustrations give a brief view of the kit and its application Vent Combustion Air Flush to 1 maximum 45 Elbow Field Supplied Combustion Air Vent Strap Field Supplied EXTERNAL FILTER RACK EFR02 Used on 97 Upflow Modulating Furnaces BLOWER DECK SCREWS SLOTS IN FILTER CLEAR SCREWS ON UNIT FRONT OF UNIT RETURN AIR CUTOUT AREA LOWER EDGE SCREW FILTER RACK ...

Page 11: ...LP gas as well as a set of 1 25 mm orifices to replace the factory installed natural gas orifices Do not attempt to convert a modulating furnace gas valve Factory burners are suit able for both gases L P and Natural Burner replacement is not required when the furnace is converted for use with L P gas AFE18 60A DUAL FUEL ACCESSORY When installing the modulating furnace with a heat pump the preferre...

Page 12: ...eur de gaz thislabel d allumer le brûleurmanuellement ON MARCHE MANUEL EN POS explosionmayresultcausingproperty renifler tout autour del appariel pour decéler OFF ARRET corporelles oulapertede vies humaines d allumage automatique ne pas essayer à 4 Replace control access panel ON MARCHE follow the instructions ToTurn la lettreles instructions dansle presént manuel D Donotusethisapplianceif anypart...

Page 13: ...AS SUPPLIER WARNING IF THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE PERSONAL INJURY OR LOSS OF LIFE DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE DO NOT TRY TO LIGHT ANY APPLIANCE DO NOT TOUCH ANY ELECTRICAL SWITCH DO NOT USE ANY PHONE IN YOUR BUILDING IMMEDIA...

Page 14: ...E TO FIRE DO NOT INSTALL THIS FURNACE IN A MOBILE HOME TRAILER OR RECREATIONAL VEHICLE WARNING Introduction This is a Category lV furnace This furnace uses a pressur ized venting system and must be installed per National and local codes requirements and the installation manual that was shipped with the furnace Our 34 5 modulating furnace is one of the products in our newly redesigned line of short...

Page 15: ...r inlet pipe is optional and the furnace can be vented as a Non direct vent single pipe central forced air furnace in which combustion air is taken from the installation area or from air ducted from the outside or Directvent dualpipe centralforcedairfurnace inwhich all combustion air supplied directly to the furnace burn ers through a field installed combustion air pipe This furnace may be used as...

Page 16: ...perfreezeprotection Referto Condensate Drain Lines and Trap for further details Ensure adequate combustion air is available for the fur nace Improper or insufficient combustion air can ex pose building occupants to gas combustion products that could include carbon monoxide Refer to Combustion and Ventilation Air Requirements Set the furnace on a level floor to enable proper conden satedrainage Ift...

Page 17: ... Furnace Components Heat Exchanger Assembly The primary heat exchanger is a tubular type constructed of high quality steel 409 stainless steel for the heat ex changer assembly consists of primary and secondary sec tions crimped together on a back transition plate The sec ondary heat exchanger is a single pass coil consisting of AL29 4C stainless steel tubes and aluminum fins These stainless steel ...

Page 18: ...f the IFC Aux Terminals Located next to the low voltage connector there are two terminals labeled aux in aux out A factory jumper is installed between these two terminals As an op tion the jumper may be removed and the terminals wired up to a normally closed float switch The switch must be closed for normal operation If the switch is sensed open the IFC will Terminate a call for gas heat When the ...

Page 19: ...BUSTIBLE MATERIALS INCHES NOTES For servicing or cleaning a 24 front clearance is required Unit connections electrical flue and drain may necessitate greater clearances than the minimum clearances listed above In all cases accessibility clearance must take precedence over clearances from the enclosure where accessibility clearances are greater Installations must adhere to the clearances to combust...

Page 20: ...aces Installation Positions DM97MC models may be installed up flow or horizontally with left or right side down DC97MC models may be in stalled down flow or horizontally with left or right side down Do not install any furnace on its back Horizontal Installations 1 Horizontal installations require 5 5 under the furnace to accommodate the drain trap 2 Horizontal furnaces must be installed with slope...

Page 21: ...de an L P gas valve and a set of gas orifices Do not change or adjust the gas valve regulator springs H igh Stage Lo w Stage Natural None 451 3 5 w c 1 w c None Propane LPM 09 1 25M M 2 1 0 0 w c 2 6 w c None M anifo ld P ressure P ressure Switch C hange 0 1 0 000 N OT E In Canada gas furnaces are only certified to 4500 feet Gas A ltitude Kit Orifice Vent Flue Pipe Combustion Air Pipe FAILURE TO F...

Page 22: ... 55 50 45 40 35 30 25 3 120 113 106 99 92 85 78 71 2 or 2 1 2 40 35 30 25 20 15 10 5 3 103 96 89 82 75 68 61 54 DC97MC1005CNA DM97MC0804CNA DM97MC1005CNA DM97MC1205DNA DC97MC0603BNA DC97MC0803BNA DC97MC0804CNA DM97MC0803BNA Direct Vent 2 Pipe and Non Direct Vent 1 Pipe 6 Model Pipe Size Number of Elbows DM97MC0603BNA 1 Maximum allowable limits listed on individual lengths for inlet and flue and NO...

Page 23: ...e corner G Clearance to inside corner H Clearance to each side of center line extended above meter regulator assembly 3 ft 91 cm within a height 15 ft 4 5 m above the meter regulator assembly OTHER THAN DIRECT VENT TERMINAL CLEARANCES 1 In accordance with the current CSA B149 1 Natural Gas and Propane Installation Code 2 In accordance with the current ANSI Z223 1 NFPA 54 National Fuel Gas Code A v...

Page 24: ...reezing within the drain line If an air conditioning coil is installed with the furnace a common drain may be used An open tee must be in stalled in the drain line near the cooling coil to relieve positive air pressure from the coil s plenum This is nec essary to prohibit any interference with the function of the furnace s drain trap Electrical Connections HIGH VOLTAGE TO AVOID THE RISK OF ELECTRI...

Page 25: ... ELECTRIC CODE WARNING Line voltage connections can be made through either the right or left side panel The furnace is shipped configured for a right side electrical connection To make electrical connec tions through the opposite side of the furnace the junction box must be relocated to the left side prior to making electri cal connections To relocate the junction box perform the following steps 1...

Page 26: ...n tacts the furnace will be disabled until the condition is cor rected These are 24 volt terminals fed internally do not apply another voltage source to these terminals R Y C NEU Furnace Integrated Control Module Remote Condensing Unit Single Stage Cooling Dehumidistat Optional R Thermostat Single Stage Heating with Single Stage Cooling TO APPLY A SINGLE STAGE HEATING THERMOSTAT THE THERMOSTAT SEL...

Page 27: ...ire may not be present on all dehumidistats 5 Turn ON power to furnace Toenablethedehumidifyfunctionontheintegratedcontrolmod ule set the dehumidification ENABLE DIP switch from OFF to ON Once the switch is set the dehumidify function is enabled dur ing a combination call for cooling T Stat and dehumidification DEHUM Stat Refer to the DIP switch chart in the back sec tion of this manual FOSSIL FUE...

Page 28: ...E THE INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING Inletgassupplypressuresmustbemaintainedwithintheranges specified in the following table The supply pressure must be constant and available with all other household gas fired appli ances operating The minimum gas supply pressure must be maintained to prevent unreliab...

Page 29: ...75 in lbs ex cessive over tightening may damage the gas valve Install a manual shutoff valve between the gas meter and unit within six feet of the unit If a union is installed the union must be downstream of the manual shutoff valve between the shutoff valve and the fur nace Tighten all joints securely Connect the furnace to the building piping by one of the following methods Rigid metallic pipe a...

Page 30: ... 2 000 2 900 4 700 1 800 4 000 40 370 850 1 700 2 700 4 100 1 600 3 700 50 330 770 1 500 2 400 3 700 1 500 3 400 60 300 700 1 300 2 200 3 300 1 300 3 100 80 260 610 1 200 1 900 2 900 1 200 2 600 100 220 540 1 000 1 700 2 600 1 000 2 300 125 200 490 900 1 400 2 300 900 2 100 150 190 430 830 1 300 2 100 830 1 900 175 170 400 780 1 200 1 900 770 1 700 200 160 380 730 1 100 1 800 720 1 500 Pipe or Tub...

Page 31: ...d manometer to measure the static pressure of the return duct at the inlet of the furnace Negative Pressure 2 Measure the static pressure of the supply duct Posi tive Pressure 3 The difference between the two numbers is 4 w c Example static reading from return duct 0 1 w c static reading from supply duct 0 3 w c total external static pressure on this system 0 4 w c NOTE Both readings may be taken ...

Page 32: ...llyby the installer Filters must comply with UL900 or CAN ULCS111 standards Damage or repairs due to the installation of the furnace without filters is not covered under the warranty On upflow units guide dimples locate the side return cutout locations Use a straight edge to scribe lines connecting the dimples Cut out the opening on these lines NOTE An under sized opening will cause reduced airflo...

Page 33: ...ity Single or double digit displayed CFM X 100 MIN 57 78 80 100 IGNITION UNIT CALL FOR HEAT ENDS 10 MINS 8 MINS 2 MINS Operation with Conventional 1 Stage Thermostat DIP switch selections 1 Stage heat Call for heat thermostat energizes W1 on IFC W2 input is ignored After a successful Light Off Sequence and expiration of the Ignition Stabilization Period After 2 minutes the IFC increases to 57 at a...

Page 34: ... Light Off Sequence After the successful Light Off Sequence and expiration of the Ignition Stabili zation Period The IFC adjusts to the low firing rate After 2 minutes the IFC accepts the specific Heat Requested Demand If the differential is equal to or less than 2 degrees the IFC will follow the conventional 2 Stage algorithm equivalent to a W1 request If the heat differential is greater than 2 d...

Page 35: ...splaying Ft the display will revert back to normal 4 Measure furnace gas supply pressure with burners firing Supply pressure must be within the range specified in the Inlet Gas Supply Pressure table Natural Gas Minimum 4 5 w c Maximum 10 0 w c Propane Gas Minimum 11 0 w c Maximum 13 0 w c Inlet Gas Supply Pressure If supply pressure differs from table make the necessary ad justments to pressure re...

Page 36: ...nd check out an installed appliance by bringing the furnace up to High fire 100 input by passing the normal modulating routine To enter Field Test Mode the Fault Recall Push Button must be pressed twice within a 5 second period at any time during a heating cycle at which time the display will show Ft While the display is showing Ft press ing and holding the Fault Recall Push Button for 3 sec onds ...

Page 37: ... the Specifica tion Sheet applicable to your model Determine and adjust temperature rise as follows 1 Operate furnace with burners firing for approxi mately ten minutes Ensure all registers are open and all duct dampers are in their final fully or par tially open position 2 Place thermometers in the return and supply ducts as close to the furnace as possible Thermometers must not be influenced by ...

Page 38: ...tor blower also offers several custom ON OFF ramping profiles These profiles may be used to enhance cooling performance and increase comfort level The ramping profiles are selected us ing DIP switches 7 and 8 Refer to the following fig ure for switch positions and their corresponding taps Refer to the bullet points below for a description of each ramping profile Verify CFM by noting the num ber di...

Page 39: ...e correct setting for a conventional single stage stat or a CTK02 CTK03 and CTK04 communicating modulating stats To use a conven tional two stage heating thermostat or a CTK01 thermo stat move this switch to the ON position Switch 14 Selects compressor setup for cooling Factory position is OFF This is the correct position for a single stage condensing unit In this position Y from the room thermost...

Page 40: ...nds OFF ON 180 Seconds ON ON 1 Stage Stat OFF 2 Stage Stat ON 1 Stage Compressor OFF 2 Stage Compressor ON Disabled OFF Enabled ON Disabled OFF Enabled ON Disabled OFF Enabled ON Disabled OFF Enabled ON Not applicable Indicates factory setting Communicating thermostats are used only with Bias Pull Up Pull Down dip switches 3 T Stat Heat Compressor Dehum Bias Pull Up Pull Down 1 2 Adjust Taps Heat ...

Page 41: ... 230VACto 24VAC transformer must be installed in the outdoor unit to pro vide24VACpowertotheoutdoorunit selectroniccontrol The transformer is included with the CTK01AA CTK03 and CTK04 kits See kit instructions for mounting and wiring instructions If using a CTK02 or CTK01BA an accessory transformer is available TFK01 Four wires are required between the in door unit and thermostat NOTE Use of the o...

Page 42: ...n the IFC closes the humidifier relay contacts except from the calibration routine where the humidifier relay con tacts are always open HUMIDIFIER OUTPUT COMMUNICATING THERMOSTAT One set of isolated relay contacts are wired to a pair of terminals for connection to a humidifier Upon receipt of a Humidification Requested Demand the IFC will Close the humidifier relay contacts Energize the circulator...

Page 43: ...communicating single stage thermostat The ComfortNet system is a system that includes a ComfortNet compatible furnace and air conditioner or heat pump with a CTK0 thermostat A valid ComfortNet system could also be a compatible furnace CTK0 communicating single stage air conditioner Any other system configurations are considered invalid ComfortNet systems and must be connected as a tradi tional or ...

Page 44: ...rough a calibration routine During the cali bration routine the IFC runs the induced draft blower at different speeds to determine the opening and closing points of the pressure switches It records this information and uses it as reference points for determining the draft in ducer speeds for all gas input rates from 35 100 Before beginning a calibration routine the IFC will check that both pressur...

Page 45: ...essure switch setting Ignition Firing Rate The target firing rate at which the appliance always lights off The appliance stays at this firing rate until the Ignition Stabilization Pe riod expires It then moves to the target firing rate called for by the operating sequence Target Firing Rate The firing rate that the IFC con trols the inducer to attain at a given time in the op erating sequence Heat...

Page 46: ...al reset rollout switch circuit opens during a heating cycle The valve is immediately de energized The inducer will run for the Post purge period at its current speed If the circulator fan is on it will run for the normal fan off delay at the current heat speed An error code is logged and displayed indicating the rollout switch circuit has opened All future thermostat heat requests are ignored The...

Page 47: ...closed calibration will not be completed and the ap propriate error code will be logged and displayed Hot Surface Igniter Operation The IFC energizes a relay to control the line voltage Hot Surface Igniter The HSI warm up time will be fixed for all ignition trials Both the continuity of the igniter and the ability of the relay to energize the igniter are continuously monitored during the Igniter W...

Page 48: ...onnector of the diagnostic tool to the end bell communicating connector Attach one of the alligator clips of the diagnostic tool to the 24 volt hot terminal of the furnace transformer and the other alligator clip to the 24 volt common ground terminal The alligator clips are not polarity sensitive Turn ON furnace power SERVICE OPERATION The orange button of the diagnostic tool sends a sig nal to th...

Page 49: ...ry Use 45 elbows rather than 90 elbows when possible Must not sag or otherwise trap condensate Use longest radius fittings possible If using 3 venting make the transition from 2 to 3 as close as practically possible Make sure there is no flue gas recirculation into the combustion air pipe Condensate Drainage Furnace combustion can be affected if a furnace is holding condensate Check for proper con...

Page 50: ...n again Safety Circuit Description A number of safety circuits are employed to ensure safe and proper furnace operation These circuits serve to control any potential safety hazards and serve as inputs in the monitoring and diagnosis of abnormal function These circuits are continu ouslymonitoredduringfurnaceoperationbytheintegratedcon trolmodule INTEGRATED FURNACE CONTROL IFC The integrated control...

Page 51: ... pipe system Check for blockage and or leakage Check the outside termination and the connections at and internal to the furnace Heat exchanger Check for corrosion and or buildup within the heat exchanger passageways Burners Check for proper ignition and burner flame Drainage system Check for blockage and or leakage Check hose connections at and internal to furnace Wiring Check electrical connectio...

Page 52: ... CONTROL 55 S 303 INDUCED DRAFT BLOWER MOTOR 55 S 304 MODULATING GAS VALVE CHECK ADJUSTMENT 55 S 304A CHECKING INDUCTOR COIL 56 SERVICING S 305 CHECKING MAIN BURNERS 57 S 306 CHECKING ORIFICES 57 S 307 CHECKING GAS PRESSURE 57 S 308 CHECKING HOT SURFACE IGNITOR 58 S 309 CHECKING FOR FLASHBACK 58 S 310 CHECKING PRESSURE CONTROL 58 S 311 HIGH ALTITUDE APPLICATION 59 S 312 CHECKING FOR DELAYED IGNITI...

Page 53: ...IRING DISCONNECT ALL POWER BEFORE SERVICING WARNING 1 Check wiring visually for signs of overheating dam aged insulation and loose connections 2 Use an ohmmeter to check continuity of any suspected open wires 3 If any wires must be replaced replace with AWM 105 C 2 64 thick insulation of the same gauge or its equiva lent CHECKING THERMOSTAT WIRING AND ANTICIPATOR S 3A THERMOSTAT AND WIRING DISCONN...

Page 54: ...fter completing check and or replacement of trans former and check and or repair of control circuit re install blower compartment door 8 Turn on electrical power and verify proper unit opera tion S 300 CHECKING PRIMARY LIMIT CONTROL All modulating furnaces use a nonadjustable automatic reset bi metal type limit control The primary limit con trol is located on the front panel of the furnace between...

Page 55: ...ire is being called for The power wires are colored red white and black A green colored ground wire is also present S 304 MODULATING GAS VALVE CHECK ADJUSTMENT Modulating furnaces use a 24 VAC pneumatically operated gas valve by Honeywell The valve is energized by the in tegrated furnace control on a call for heat wired in series through the front cover pressure switch The firing rate percentage i...

Page 56: ... the appropriate range shown below If manifold pressure is found to be within the acceptable range do not adjust gas valve Natural Gas Minimum 9 w c Maximum 1 2 w c L P Gas Minimum 2 6 w c Maximum 3 3 w c Manifold Gas Pressure 50 Firing Rate Manifold Gas Pressure 12 If manifold pressure is found to be lower than accept able less than 9 wc for natural gas less than 2 6 WC for LP gas turn the fine a...

Page 57: ...s being consumed Orifices should be treated with care in order to prevent damage They should be removed and installed with a box end wrench in order to prevent distortion In no instance should an orifice be peened over and redrilled A GAS STREAM B The length of Dimension A determines the angle of Gas Stream B DENT OR BURR GAS STREAM B A dent or burr will cause a severe deflection of the gas stream...

Page 58: ... w c Propane Gas 10 0 w c Manifold Gas Pressure S 308 CHECKING HOT SURFACE IGNITOR Modulating furnaces use a 115 volt silicon nitride hot sur face igniter This is the familiar and reliable 0131F00008S igniter with 17 second warm up time At room tempera ture the igniter has a resistance range of 37 68 ohms The H S I isconnected electrically to the IFC by a 3 16 push on connection S 309 CHECKING FOR...

Page 59: ...G SERVICE LISTED BELOW WARNING The ground wire must run from the furnace all the way back to the electrical panel Proper grounding can be con firmed by disconnecting the electrical power and measur ing resistance between the neutral white connection and the burner closest to the flame sensor Resistance should be less than 10 ohms The ignition control is a combination electronic and elec tromechani...

Page 60: ...tinuously monitored by the IFC The flame rod flame rod wire and proper grounding are all critical to proving the presence of flame Because of the design of the Honeywell flame proving system reading flame signal with a microamp meter will not provide reli able and consistent results and is therefore not a recom mended practice The IFC has a built in warning E6 if flame signal is approaching the lo...

Page 61: ...1 01 0130F00482 DM97MC0804CNAA 0 10 05 0 25 0130F00481 0 17 05 0 32 0 86 05 1 01 0130F00482 DM97MC1005CNAA 0 10 05 0 25 0130F00481 0 17 05 0 32 0 86 05 1 01 0130F00483 DM97MC1205DNAA 0 10 05 0 25 0130F00481 0 17 05 0 32 0 86 05 1 01 0130F00483 DC97MC0603BNAA 0 10 05 0 25 0130F00481 0 17 05 0 32 0 86 0 05 1 01 0130F00482 DC97MC0803BNAA 0 10 05 0 25 0130F00481 0 17 05 0 32 0 86 0 05 1 01 0130F00482 ...

Page 62: ...sary Make sure furnace is draining properly Replaceor realign igniter Check flame sense signal Clean sensor if coated and or oxidized Check flue piping for blockage proper length elbows and termination Verify proper induced draft blower performance Turn power OFF prior to repair Igniter is fragile handle with care Clean flame rod with steel wool See Vent FluePipe section for piping details Furnace...

Page 63: ...Net thermostat scrolls Check Furnace message EC x Inducer motor overcurrent fault INDUCER FAULT OR INDUCER LOCKOUT EC x Lingering Inducer motor overcurrent detected x Reset system power and verify inducer is running properly x Replace inducer or integrated control module if necessary x No furnace operation x Integrated control module LED display provides Ed error code Ed x Manual reset rollout swi...

Page 64: ...ecessary x Inspect flue and or inlet air piping for blockage proper length elbows and termination Check drain system Correct as necessary x Check induced draft blower performance Correct as necessary x Correct pressure switch set point or contact motion x Tighten or correct wiring connection x Turn power OFF prior to repair x Replace pressure switch with correct replacement part x Replace induced ...

Page 65: ... has lost communications with circulator blower motor MOTOR COMM b1 x Loose wiring connection at circulator motor control leads x Failed circulator blower motor x Failed integrated control module x Tighten or correct wiring connection x Check blower motor with UTT 01 Emerson tester x Check integrated control module Replace if necessary x Turn power OFF prior to repair x Replace circulator motor wi...

Page 66: ...ComfortNet thermostat Call for Service icon illuminated x ComfortNet thermostat scrolls Check Furnace message b6 x Circulator blower motor shuts down for over or under voltage condition x Circulator blower motor shuts down due to over temperature condition on power module MOTOR VOLTS b6 x High AC line voltage to furnace x Low AC line voltage to furnace x High ambient temperatures x Check power to ...

Page 67: ...AGE COMPRESSOR COOLING WITH DEHUMIDIFICATION WHEN 2 STAGE COMPRESSOR IS SET UP d4 INVALID MEMORY CARD DATA dF DEFROST DEMAND E0 LOCKOUT DUE TO EXCESSIVE RETRIES OR RECYCLES E1 LOW STAGE PRESSURE SWITCH STUCK CLOSED AT START OF HEATING CYCLE E2 LOW STAGE PRESSURE SWITCH STUCK OPEN E3 OPEN HIGH LIMIT SWITCH E4 FLAME DETECTED WHEN NO FLAME SHOULD BE PRESENT E5 OPEN FUSE E6 LOW FLAME SIGNAL E7 IGNITER...

Page 68: ...115 VAC 1 POWER SUPPLY WITH POWER BEFORE SERVICING WIRING TO UNIT MUST BE TO UNIT MUST BE PROPERLY POLARIZED EQUIPMENT GND FIELD SPLICE SWITCH TEMP SWITCH PRESSURE PROT DEVICE LOW VOLTAGE FIELD LOW VOLTAGE 24V HI VOLTAGE 115V HI VOLTAGE FIELD INTERNAL TO INTEGRATED CONTROL PLUG CONNECTION 1 SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0 7 AMPS 2 MANUFACTURER S SPECIFIED REPLACEMENT PARTS MUST BE USE...