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Lennox 70LENX1000, Manual

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Lennox 70LENX1000 Manual Download Page 37

Control box –Main board

J1A – General power supply 230V

J1B, J1B2 – Earth connection

J9B – RESET connector

J8B - Ignitor connection

J8D - Gas valve connection

J8C – Contacts in bridge – not used

J8A – Gas blower power connection

J9A2 – signal lamps

F3 & F4 – burner protection

F3=F4=3,15A

J8F – Gas blower modulating line / Hall sensor

J7B – Alarm inputs (E2) - temporary alarms

J7C – Alarm inputs (E3) - permanent alarms 

Xc – Burner controller Genius M82

Summary of Contents for 70LENX1000

Page 1: ...Heat exchanger gas units service training Federico Cortelazzo Dariusz Przygocki Barbara Kowalczyk 1st 3rd March 2022 Smart Energy Company www systemapolska pl ...

Page 2: ... panel operating tutorial 4 Improvements retrofit 5 GHEU s operating cycles 6 Commissioning Pre commissioning Start up Hi Lo power flow procedure 7 Gas valve adjustment 8 Replacement gas valves electrodes 9 Alarms tutorial 10 Maintenance plan 11 Communication between Climatic HEGU Smart Energy Company www systemapolska pl ...

Page 3: ...m leaders Boussad ERIC Trainner Darek Federico Topics Preparation for commissioning Start up Hi Lo procedurę Control panel operating Ignition test Alarms Replacement of electrodes valve Burner disassembing assembling Smart Energy Company www systemapolska pl ...

Page 4: ...X1003 70LENX1004 70LENX1005 70LENX1006 LGL France Goods E BALTIC C BOX E BALTIC D BOX E BALTIC E BOX E BALTIC E BOX E BALTIC F BOX E BALTIC G BOX E BATLIC H BOX Cat No Longvic 4380816E 4380817F 4380818H 4380822M 4380819J 4380820K 4380821L Cat No Burgos 5006181 5006182 5006183 5006210 X X X Nominal heat input 50 kW 70 kW 90 kW 110 kW 130 kW 170 kW 230 kW Airflow min max 4 200 6 900 7 100 11 000 13 ...

Page 5: ...it own serial number Model EOLO LXC 50 EOLO LXD 70 EOLO LXE 90 Cat No S 70LENX0120 70LENX0121 70LENX0122 LGL France Goods E BALTIC C BOX E BALTIC D BOX E BALTIC E BOX Cat No Longvic 61298512 61299199 61299200 Nominal heat input 50 kW 70 kW 90 kW Airflow min max 4 200 6 900 7 100 11 000 13 500 16 000 ...

Page 6: ...LO LXC 50 E Baltic C box 2 Serial no L21B11084 3 CE sign Certificate name 4 Type of gas 5 Nominal heat input output 6 Country destination France 7 Language Frensh or Spanish or English or Smart Energy Company www systemapolska pl ...

Page 7: ...lska pl 1 Plate heat exchanger 2 Mounting plate 3 Control box 4 Burner unit 5 6 Sensor temp cover 7 8 9 10 Temp sensors 11 Insulation gasket 12 Pneumatic elbow 13 Elbow 14 Transformer 15 Internal combustion chamber 16 Measure point of pressostat 17 18 19 20 exhaust pipes set ...

Page 8: ...ollers with opportunity to connect with Climatic Control panel connection with necessary components 4 Burner unit gas combustion in phe 5 10 Temp sensors with covers measures temp on the Surface of phe 11 Insulation gasket 12 Pneumatic elbow 13 Elbow 14 Transformer voltage convertion from 400 V to 230V ERT Kr on wring diagram 15 Internal combustion chamber deacreasing Surface of phe 16 Pipe 17 18 ...

Page 9: ...Burner units model E Baltic C D E box Smart Energy Company www systemapolska pl ...

Page 10: ...Burner units model E Baltic F G H box Smart Energy Company www systemapolska pl ...

Page 11: ...rgy Company www systemapolska pl 1 Burner flange 2 3 Insulation plate 4 Burner head 5 Electrodes set 7 Gas blower 8 Gas air mixer 9 Gas valve 10 Flexible gas pipe 12 Hi voltage transformer 15 Gas blower control cable 18 Gas blower wiring supply ...

Page 12: ... air mixture 5 Electrodes set ignition 7 Gas blower supply gas and air mixture 8 Gas air mixer mix gas air 9 Gas valve control gas valume in burner 10 Flexible gas pipe connection with main gas supply 12 Hi voltage transformer provide ingition 15 Gas blower control cable management modulation of burner rotation speed 8 Gas blower wiring supply ...

Page 13: ...H box Smart Energy Company www systemapolska pl 1 Burner flange 2 3 Insulation 4 Burner head 5 Electrodes set 6 Gas blower 7 Gas air mixer 9 Gas valve 11 19 Gas pressure switch 13 Flexible gas pipe 15 Hi voltage transformer ...

Page 14: ...w systemapolska pl 4 Matherboard main electronic board 5 Burner controller GENIUS M82 Brahma management burner control operating 6 Air pressure switch 7 Safety thermostat Klikson overheating 12 Communication plate communicate components with motherboard and Climatic ...

Page 15: ...rd 34 36 Red lamp Green lamp Orange lamp 37 Air flow pressure swich not use by Lennox 38 4 pin adapter valid for all units from serial no L21G11320 41 Reset buton 43 Communication plate 44 Programming button Smart Energy Company www systemapolska pl ...

Page 16: ...mpany www systemapolska pl 1 Instruction Operation Manual English French Spanish Polish 2 Spare parts list 3 Leaflet 4 PPT presentation 5 Commissioning diagram tutorial 6 Hi Lo procedure diagram tutorial IOM in English French Spanish Polish ...

Page 17: ...alve or reducer Smart Energy Company www systemapolska pl PLS ADD THE WHOLE PIPES OF GAS Model EOLO LXC EOLO LXD EOLO LXE EOLO LXE EOLO LXF EOLO LXG EOLO LXH Capacity in kW 50 70 90 110 130 170 230 Volume in m3 0 02 0 031 0 039 0 048 0 056 0 065 0 095 ...

Page 18: ...HEGU improvements retrofit Smart Energy Company www systemapolska pl 4 pin connection for 4 pobes of heat exchanger from serial no L21G11320 ...

Page 19: ...HEGU Improvements retrofit Smart Energy Company www systemapolska pl Electrodes from double to single 2 pcs For C D E E From serial no L21G11320 ...

Page 20: ...HEGU improvements retrofit Smart Energy Company www systemapolska pl New burner Controller Genious 821 TW30 is replecement by Brahma 500015521 32505 from serial no L22B11503 ...

Page 21: ...HEGU improvements retrofit Smart Energy Company www systemapolska pl Place of programming buton reset buton form serial no L22B11505 ...

Page 22: ...EGU Retrofit Smart Energy Company www systemapolska pl 1 New burner controller Brahma instead of Genius 2 New type of electrodes 2 x single instead of one double use repair kits 3 New shape of electrodes ...

Page 23: ...Heat exchanger gas unit SIGNAL Smart Energy Company www systemapolska pl Signals on the dispaly Main Control board SCP674V130B1 The same communication board for each models ...

Page 24: ...Heat exchanger gas unit Phases Smart Energy Company www systemapolska pl Reset burner No command No command Level of burner to heat to operation Post ventilation mode ...

Page 25: ...Heat exchanger gas unit Mainboard operation Smart Energy Company www systemapolska pl Test mode Testing fase Combustion chamber Waiting time pre ventillation ...

Page 26: ...hanger gas unit Main board operation Smart Energy Company www systemapolska pl Pasword service mode Max min Time of to enter burner operation setting operation Y2 YC Yt according to at Yc level Yc Yt parameters ...

Page 27: ...Heat exchanger gas unit Main board operation Smart Energy Company www systemapolska pl BOOST burner starting power burner min power burner max power not used in Lennox devices ...

Page 28: ...ngs Smart Energy Company www systemapolska pl Burner operation parameter MOI point 4 6 page 30 31 PA parameter introducting changes 33 code for manual mode Modifiable parameters Y2 Burner modulation power in fom 0 99 default 20 ...

Page 29: ...t Energy Company www systemapolska pl Non modifiable burner parameters read only rL min burner fan speed value ro offest of rL during standard operation rH max burner fan speed value Y2 boost level Y9 gas blower type HH release firmware ...

Page 30: ... After realeasing button the value 00 appears 3 Press button again to enter code 33 manual operations 4 Wait 3 s without doing nothing 5 You are in service mode during 4 minutes 6 Press and hold button until display shows Y2 and release the button 7 Press button again to modify Y2 from 0 99 button ...

Page 31: ...Heat exchanger gas unit Main board operation ...

Page 32: ...Heat exchanger gas unit Main board operation Smart Energy Company www systemapolska pl Example on E Baltic C box Model C Nominal heat input 50 kW Min heat input 10 kW Signs 00 10 kW 99 50 kW ...

Page 33: ...peration Smart Energy Company www systemapolska pl 00 kW 99 kW EOLO LXC 50 C BOX 10 50 EOLO LXD 70 D BOX 14 70 EOLO LXE 90 E BOX 18 90 EOLO LXE 110 E BOX 22 110 EOLO LXF 130 F BOX 26 130 EOLO LXG 170 G BOX 34 170 EOLO LXH 230 H BOX 46 230 ...

Page 34: ... operating Smart Energy Company www systemapolska pl 1 External control panel for Receiving information Resseting alarms Managing Control HEGU 2 The name of alarms are not the same as alarms on Motherboard s display ...

Page 35: ...Control box wiring diagram Smart Energy Company www systemapolska pl Wiring diagram page 23 MOI English Matherboard SCP674V130B1 Communication plate SCP674V202MB ...

Page 36: ... E5 E6 error J6B Kr resistance kit relay power supply J7B a min gas pressure switch option J7B b Air pressure switch J7C c Safety thermostat connection J7C d Max gas pressure switch option KEY Programming buton connector iFS Copying parameters port CN1 CN2 SCP674V202MB slave board connector ...

Page 37: ...itor connection J8D Gas valve connection J8C Contacts in bridge not used J8A Gas blower power connection J9A2 signal lamps F3 F4 burner protection F3 F4 3 15A J8F Gas blower modulating line Hall sensor J7B Alarm inputs E2 temporary alarms J7C Alarm inputs E3 permanent alarms Xc Burner controller Genius M82 ...

Page 38: ...ystemapolska pl J11 Modbus connection iFS programming interface J3 P3 Inlet air temp probe P4 Airflow temp probe CN1 CN2 connector to main booard J1 reset configuration switches J9 connection to ext display J2 heat exchanger temp sensor J5 manual burner start ...

Page 39: ...Smart Energy Company www systemapolska pl J7B Min gas pressure switch air pressure switch J7C Max gas pressure switch safty thermostat J8F gas blower control J9A2 signal lamps J8A gas blower J8C Not used J8D gas valve J8B Ignitor ...

Page 40: ...ntrol box wiring diagram Smart Energy Company www systemapolska pl J1A General power supply J9B Machine reset J1B J1B2 protective conductor ETR Kr resistance kit relay power supply option low temp outside ...

Page 41: ...ontrol box wiring diagram Smart Energy Company www systemapolska pl P4 1 to P4 4 Outlet air temp sensor Pp use for programming main board P1 heat exchanger temp sensor GO Manual burner operating control ...

Page 42: ...nication or manualy close connector J5 contacts 1 2 Gas heater will start to work only when the main fans are running Otherwise the module will display an E3 error In correct conditions gas unit will perform a startup cycle First symbol to appear on display is the initial phase 5 10 sec The next testing fase starts after 20 30 sec ...

Page 43: ...heat exchanger unit operating cycles After testing fase burner goes to pre purging fase 30 sec Orange lamp ON The next step open gas valve and apply high voltage to the electrodes Green lamp ON Spark starts ...

Page 44: ...essful ignition burner continues After a successful ignition burner continues boost phase for 3 minutes i e work with starting power then after approx 3 minutes the burner switches to normal operation and displays the percentage power level between 0 99 ...

Page 45: ...Gas heat exchanger unit operating cycles if the burner did not start it makes two more attempts to start After third unsuccessful attempt the burner locks Red lamp ON Error E4 on the display ...

Page 46: ...me plate Check with the pressure intake IN on the gas valve that pressure entering the valve corresponds to that required for the type of gas being used Purge the gas pipe Check tightness of gas system Check Correctness of electrical connection Voltage value Check that efficient earthing connections have been completed carried out as specified by current safety regulations Tabele 5 1 page 44 ...

Page 47: ... action 1 Check the filter 3 2 Open shut off main gas valve 1 3 Pre purge gas pipe from air 4 Check tightness by tester 5 Turn on the main electrical power swich 1 shut off valve 2 checking point 3 filter 4manometer 5 gas regulator 6 manometer 13 checking point ...

Page 48: ...Heat exchanger gas unit Commissioning Smart Energy Company www systemapolska pl View of heat exchanger gas unit E Baltic C box ...

Page 49: ...Smart Energy Company www systemapolska pl Commissioning procedure start up ...

Page 50: ...Smart Energy Company www systemapolska pl Preparation 1 Check type of module 2 Find the table in IOM page 61 3 Prepare combustion analyser 4 Use HEX 4 or Torx 25 for making adjustment Make pressure adjustment just after starting the burner ...

Page 51: ...HEGU procedure to put in Lo Hi power Smart Energy Company www systemapolska pl Necessary tools for regulation Hex 4 or T25 T40 T40 T25 H 4 ...

Page 52: ...to has gas valve 2 Use off set regulator or gas air mixer for E E F for Lo power flow 3 Use internal valve screw 4 Gas valve is set to manual mode for 6 minutes 5 Enter code 61 and adjust gas valve to max power flow 6 Enter code 51 and make adjustment gas valve for min power flow Hi T40 Lo T25 ...

Page 53: ...re to put in Lo Hi power Smart Energy Company www systemapolska pl The main codes necessary for using during procedure Parameter manual mode Time parameter eg 5 10 minutes Setting capacity max Setting capaicty min ...

Page 54: ...rocedure to put in Lo Hi power Smart Energy Company www systemapolska pl Model C D Model E E F Model G H 1 Model C D VK4205VE5002 2 Model E E F VK 4415V1002B 3 Model G H VR415VE50924 Lo Hi Gas air mixer ...

Page 55: ... Hi power Smart Energy Company www systemapolska pl The targeted parameters G20 CO2 8 7 λ 1 35 Parameters on combustion analyser CO 100 ppm CO2 7 8 8 9 NOx 30 ppm Ts fume temp ɳ efficiency λ 1 35 1 48 CO ppm CO2 NOx ppm Ts C ɳ λ ...

Page 56: ...HEGU procedure to put in Hi Lo power Smart Energy Company www systemapolska pl ...

Page 57: ...HEGU procedure to put in Lo Hi power Smart Energy Company www systemapolska pl The procedure should be carried out after the burner has just started ...

Page 58: ...Supply pressure in countries Smart Energy Company www systemapolska pl Tabele 5 1 page 44 ...

Page 59: ...polska pl Replacement venturi if it is necessary mainly Poland 1 Always make Hi Lo procedure after replacement spare parts change fuel 2 Check if is necessary to replace venturi It is valid for Poland 3 Make calibration if the gas valve is out of control ...

Page 60: ...s T C 170 43 112 28 137 34 145 39 132 39 CO2 8 7 8 6 8 5 8 6 8 6 8 7 8 7 8 9 8 7 8 6 NOx ppm 37 20 29 32 29 26 34 22 30 21 G 25 Exhoust gas T C 165 39 110 28 135 34 140 39 133 38 CO2 8 7 8 5 8 6 8 5 8 5 8 6 8 7 8 7 8 7 8 5 NOx ppm 37 20 29 32 29 26 34 22 30 21 G31 Exhoust T C 175 42 111 28 140 35 145 39 132 39 CO2 10 3 10 4 10 3 10 3 10 2 10 4 10 3 10 4 10 3 10 2 NOx ppm 40 28 32 31 32 29 37 25 33...

Page 61: ...Gas valve calibration Smart Energy Company www systemapolska pl Based on E Baltic C box IOM page 62 ...

Page 62: ...stemapolska pl Module C G20 20 mbar min max CO2 7 8 8 9 1 Full open by turning right to the end 2 Set by turning 3 75 turns to the left 3 Target CO2 8 7 Lo 1 Full open by turning right to the end 2 Set by turning 4 turns to the left 3 Target CO2 8 6 Hi T40 T25 ...

Page 63: ...Heat exchanger gas unit Maintenance Smart Energy Company www systemapolska pl Replacement gas valve tutorial Model C D model E E F model G H T40 T25 T40 T25 T40 T15 ...

Page 64: ...t Energy Company www systemapolska pl Non modifiable burner parameters read only rL min burner fan speed value ro offest of rL during standard operation rH max burner fan speed value Y2 boost level Y9 gas blower type HH release firmware ...

Page 65: ... After realeasing button the value 00 appears 3 Press button again to enter code 33 manual operations 4 Wait 3 s without doing nothing 5 You are in service mode during 4 minutes 6 Press and hold button until display shows Y2 and release the button 7 Press button again to modify Y2 from 0 99 button ...

Page 66: ...Heat exchanger gas unit Maintenance Smart Energy Company www systemapolska pl Replacement electrodes standard procedure tutorial ...

Page 67: ...Burner electrode change in module C D E E Smart Energy Company www systemapolska pl From serial no L21G11320 ...

Page 68: ...Heat exchanger gas unit Maintenance Smart Energy Company www systemapolska pl 3 repair kits burner with index no 70LXPAL0023 0025 C D E ...

Page 69: ...Heat exchanger gas unit Maintenance Smart Energy Company www systemapolska pl Remove burner unit from heat exchanger gas unit ...

Page 70: ...Heat exchanger gas unit Maintenance Smart Energy Company www systemapolska pl Remove the insulation gasket Unscrew 4 nuts ...

Page 71: ...Heat exchanger gas unit Maintenance Smart Energy Company www systemapolska pl Remove burner plate install the repair kits burner ...

Page 72: ...Heat exchanger gas unit Maintenance Smart Energy Company www systemapolska pl Screw 4 nuts Install the insulation gasket ...

Page 73: ...Heat exchanger gas unit Maintenance Smart Energy Company www systemapolska pl Install the burner unit with new electrode set to heat exchanger gas unit ...

Page 74: ...Heat exchanger gas unit Troubleshooting Smart Energy Company www systemapolska pl ...

Page 75: ...ation speed Air switch E3 A18 Overheating of he Reset burner probe E4 A17 Burner is blocked 1 Valve regulation 2 Replace electrodes Valve electrodes E5 E6 Lack of connection control wiring 1 Connect 2 Turn off turn on units Blower blower wiring supply E8 A41 HE is overheated Deacrease level of burner operating and wait Heat exchanger E9 Burner is blocked for some period Make double reset E4 ...

Page 76: ...anger gas unit ALARM Smart Energy Company www systemapolska pl Alarm solutions Alarm Main electronic board is disconnected with communication board Solution Check that the communication board is fitted correctly ...

Page 77: ...nit ALARM Smart Energy Company www systemapolska pl Alarms solutions Alarm General contact J7B is opened min gas pressure switch Pg Air pressure switch Solution Check the required gas pressure check circuit of J7B contact ...

Page 78: ...rgy Company www systemapolska pl Alarms solutions Alarm Happend or in progres Contact J7C is open Max gas pressure switch is open or overheat thermostat is opened Klikson Solution Check gas pressure Pushs reset on overheat thermostat Klikson ...

Page 79: ...Heat exchanger gas unit ALARM Smart Energy Company www systemapolska pl Alarms solutions Alarm Burner is lockouted The red light is on Solution Pushs reset buttom during 3 s ...

Page 80: ...phase and neutral polarity Lack of gas in the burner Check the gas suply line Wrong type of gas 1 Check if the type of gas complies with the gas on name plate 2 If not adjust the unit to the proper one by regulation valve Hi Lo procedurę Wrong gas pressure 1 Check the pressure with the valve shown on name plate 2 Performe gas valve adjustment MOI 60 66 procedure Hi Lo ...

Page 81: ...ing in MOI page 57 2 Replace them with original spare parts Note Use the same type of elctrodes for box F G H and for C D E E with serial no higher than L21G11320 For modules C D E E with lower serial no use repair kit burner 3 Replace the ground electrode conector wire yellow green with the ignition electrode connector red wire Ignitor broken If it is spark issue and or replace with the original ...

Page 82: ...oller corect operation and or replace it Gas valve does not work 1 Check the way of operation the gas supply on the valve replace with the orginal one if it is necessary 2 Main board faulty replace with original spare parts 3 Check the operation of gas valve coils and replace with original one 4 Check the operation of control unit replace withoriginal one if necessary ...

Page 83: ...phase and neutral polarity Lack of gas in the burner Check the gas suply line Wrong type of gas 1 Check if the type of gas complies with the gas on name plate 2 If not adjust the unit to the proper one by regulation valve Hi Lo procedurę Wrong gas pressure 1 Check the pressure with the valve shown on name plate 2 Performe gas valve adjustment MOI 60 66 procedure Hi Lo ...

Page 84: ...as unit ALARM Smart Energy Company www systemapolska pl Alarms solutions Alarm To low min speed of gas blower than burner switchs off Solution Check connection of gas blower control Check parameter Y9 on the mainboard ...

Page 85: ...g connection of controling gas blower Check wire plug conectors J8F Gas blower control cable dameged Replace with original spare part if necessary Gas blower defectives Motherboard defective Wrong parameters Y9 on motherboard Check and or set Y9 parameter Box D E E F G Y9 1 Box C Y9 2 Box H Y9 3 ...

Page 86: ...s unit ALARM Smart Energy Company www systemapolska pl Alarms solutions Alarm Error of high speed of gas blower than burner switchs off Solution Check connection of gas blower control Check parameter Y9 on the mainboard ...

Page 87: ...g connection of controling gas blower Check wire plug conectors J8F Gas blower control cable dameged Replace with original spare part if necessary Gas blower defectives Motherboard defective Wrong parameters Y9 on motherboard Check and or set Y9 parameter Box D E E F G Y9 1 Box C Y9 2 Box H Y9 3 ...

Page 88: ...Heat exchanger gas unit ALARM Smart Energy Company www systemapolska pl Alarms solutions Alarm Start up test failed burner locks out Solution Remove restore power to the board ...

Page 89: ...nit ALARM Smart Energy Company www systemapolska pl Alarms solutions Alarm To high temperature of heat exchanger surface probe P1 PT1000 Solution Wait for decreasing temperature using fans in operating Change sensor damage ...

Page 90: ...Heat exchanger gas unit ALARM Smart Energy Company www systemapolska pl Alarms solutions Alarm Red green lamps is lighting at the same time Internal error Solution Closes RT contact ...

Page 91: ...y www systemapolska pl Alarms solutions Alarm Serious alarm damaged database Solution Contacts the service center Checks the value rL rH Y9 After introducing the new parameters provided by producer turns off the power supply of the board at least 10 s ...

Page 92: ... exchanger gas unit ALARM Smart Energy Company www systemapolska pl Alarms solutions Alarm Memory fault EEPROM Solution Switch off power supply for 10s Restore software of main board and communication board ...

Page 93: ...k the gas pressure supply at the gas valve x 3 Check flue exhaust air intake grill x 4 Check the Venturi pipe clean it if necessary x 5 Check exchanger clean it if necessary X 6 Check burner head clean it if necessary x 7 Check electrodes clean it if necessary x 8 Check and clean condensate drain x 9 Check operation of flame x 10 Check the safety thermostat x ...

Page 94: ...d outside the device behind the main gas valve 2 Check the gas pressure supply at the gas valve Measure the gas pressure with a pressure gauge The measuring point is at the inlet to the gas valve 3 Check flue exhaust air intake grill Visually inspect where possible Check the status of the ducts Remove dust and any obstruction on the air intake ...

Page 95: ... dirt at the mouth of the Venturi pipe with a brush Be careful to not let it fall inside the piece 6 Check electrodes clean it Use fine sandpaper to clean the electrode core 5 Check burner head clean it if necessary Remove any dirt from perforated surface with a brush Check the condition of the head ...

Page 96: ...er power supply use isolated tool Carefully remove the fast on from the safety thermostat the alarm E3 must appear on the display Then push RESET 3sec for to cancel the alarm 8 Check operation of flame and ionisation controling When the burner is working close the gas valve and verify that the burner is stopped After 3th spark start alarm display E4 Reopen the gas valve reset the alarm and wait fo...

Page 97: ...Smart Energy Company www systemapolska pl THANK YOU FOR ATTENTION ...

Page 98: ...Control box wiring diagram Smart Energy Company www systemapolska pl J1A General power supply J9B Machine reset J1B J1B2 protective conductor ETR Kr resistance kit relay power supply ...

Page 99: ...ontrol box wiring diagram Smart Energy Company www systemapolska pl P4 1 to P4 4 Outlet air temp sensor Pp use for programming main board P1 heat exchanger temp sensor GO Manual burner operating control ...

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