Laars IGE-199C-5(N,X) - Service Manual User Manual

SERVICEMANUALTankless Gas Water HeaterTroubleshooting Guideand Instruction for Service(To be performed ONLY by qualified service providers)For the LAA

II - SPECIFICATIONS – GENERAL (cont.)Power Supply Appliance – 120 Volts A.C. – 60 Hz.Remote control 12 volt D.C. (Digital)Safety Devices Flame failur

II - SPECIFICATIONS (cont.)COMBUSTION SPECIFICATIONSItem Gas Type Natural PropaneGas Consumption Minimum Btu's 15,000 15,000 Maximum Btu'

12II - SPECIFICATIONS (cont.)DIP SWITCH SETTINGSDANGERDo not attempt to adjust dip switch settings from there factory default settings.Doing so will r

III - MAIN COMPONENTS1. Mechanical Water RegulatorThe unique water regulator mechanism ensures the hot water is maintained with no noticeablechange to

III - MAIN COMPONENTS (cont.)5. Combustion FanAir for the combustion is supplied by a centrifugal fandriven by a DC motor. After a pre-purge period of

IV - SAFETY DEVICE FUNCTIONFlame FailureSituated to the right of the burner in the front of the combustion chamber, the flame rod monitors thecombusti

IV - SAFETY DEVICE FUNCTION (cont.)Over temperature Cut-OffThe temperature of the outgoing hot water is constantly monitored by the water temperaturet

V - SEQUENCE OF OPERATIONThe preset temperature is selected at one of the remotes controls (where fitted). Where no remotecontrol is fitted , the defa

V - SEQUENCE OF OPERATION (cont.)When the hot water tap is turned off, the water flow sensor stops revolving, and the magnetic pulseceases, indicating

V - SEQUENCE OF OPERATION (cont.)OPERATION SEQUENCE FLOW CHART19

Key to Warning SymbolsFailure to comply with the following instructions may results in serious personal injury ordamage to the appliance.Be careful of

20V - SEQUENCE OF OPERATION (cont.)OPERATION SEQUENCE FLOW CHART

V - SEQUENCE OF OPERATION (cont.)SEQUENCE TIMING CHART21

22V - SEQUENCE OF OPERATION (cont.)SEQUENCE TIMING CHART

23VI - TROUBLESHOOTINGERROR MESSAGESError Faulty Remedy10 Air Supply or Exhaust Blockage Check intake and exhaust ports for obstructions.Check that

24VI - TROUBLESHOOTING (cont.)ERROR MESSAGESError Faulty Remedy32 Outgoing Water Check sensor wiring for damage.Temperature Sensor Faulty Check resi

VI - TROUBLESHOOTING (cont.)QUICK REFERENCE DIAGNOSTIC POINTSIMPORTANT SAFETY NOTES:There are a number of (live) tests that are required when fault fi

VI - TROUBLESHOOTING (cont.)Thermal Fuse:Red ~Red 100 VAC Below 1 ohm B ~C B6 ~C1Overheat Switch:Red ~Red 100 VAC Below 1 ohm B ~C B6 ~C1Flame R

VI - TROUBLE SHOOTING (cont.)Using a voltage meter set to the 200 ohm scale, you should have a resistance reading of 26 - 30ohms through each of thes

VI - TROUBLE SHOOTING (cont.)WIRING SCHEMATIC28

29Nature of FaultExaminationPoint Diagnostic Point Values Y/N ActionServiceProcedureA. The LED onthe remotecontrol does notlight up, whenthe system is

TABLE OF CONTENTSSection Description Page- - - Glossary of Terms and Symbols... 4I ...

30Nature of FaultExaminationPoint Diagnostic PointValues Y/N ActionServiceProcedure2. Measure the voltageat connector F withappliance power supplyon.F

31Nature of FaultExaminationPointDiagnostic Point Values Y/N ActionServiceProcedureError code "11"displayed ondigital monitor.5. Check ignit

32Nature of FaultExaminationPoint Diagnostic Point Values Y/N ActionServiceProcedureC. Combustionoccurs, but flamefails.Error code "12"displ

33Nature of FaultExaminationPoint Diagnostic Point Values Y/N ActionServiceProcedure2. Measure voltagebetween orange (+) andgrey (-) of the water flow

34VI - TROUBLESHOOTING (cont.)Troubleshooting ProcedureUnit’s wiring diagram can be found on page 27.Appliance fails to operate (even remote control f

3) Is the remote control normal?No combustion (despite remote control indication)1) Is the water flow sensor normal?Check voltage between the two remo

362) Is the flame rod normal? Error “72” is displayed3) Is the water temperature thermistor normal?Checking the flame rod.a. # Detach the flame rod t

374) Is the combustion fan motor normal?5) Is the ignition module operating normally?.Check the sparker module.a. Measure voltage at connector F8, gr

38If error “11” or “71” is displayed, check the main gas solenoidvalve.a. # Disconnect the main gas solenoid valve (SV0) connector and measure the re

399) Is the change over solenoid (SV3) operating normally?If error “11” or “71” is displayed, check the change over solenoid (SV3).a. # Disconnect th

GLOSSARY OF TERMS AND SYMBOLSThis glossary of terms and symbols is provided to assist you in understanding some of thelanguage used throughout this ma

40Combustion stops due to flame failure1) Is the flame rod functioning normally?2) Is the earth lead wire connected?a. Measure the voltage between the

41Unable to adjust hot water temperature1) Is the water temperature thermistor operating normally?2) Is the change over solenoid (SV1) normal?a. # Di

42a. # Disconnect the modulating valve festoon C2terminals and measure the resistance at the terminals.Normal: 67 ~81 ΩIf normal, check b.Faulty: Rep

43Anti-frost heaters do not operate1) Are the ceramic anti-frost heaters operating normally?2) Is the frost sensor switch operating normally?a. # Dis

VII - GAS PRESSURE SETTING PROCEDUREAll settings/adjustments must be performedby a qualified Service Technician.1. Turn unit off at power source and

8. Turn off the gas to the water heater. Remove the manometer connection. Reinstall thepressure port plug. Turn on the gas to the water heater and ch

VIII - SERVICE PROCEDURENOTE: Before proceeding with dismantling, be sure to follow the CAUTIONinstructions before each explanation. Always disconnect

47WARNINGDip switched #7 and #8 (combustion control switches) MUSTbe returned to the "OFF" position, after setting pressures.Dip switch #1 M

a. Remove the four (4) Phillips screws that secure the water inlet filter housing to the unit. See picture below for location of screws. Once screws

IGE - 7. Removal of Transformer:CAUTION120 volt potential exposure. Isolate the applianceand reconfirm power has been disconnectedusing a multimeter.a

I - GENERAL INFORMATIONThis tankless water heater is a high output, high efficiency appliance, which heats the watercontinuously as hot water is being

IGE - 9. Removal of the Gas Valve Assembly:CAUTION120 volt potential exposure. Isolate the applianceand reconfirm power has been disconnectedusing a m

IGE - 11. Removal of Thermal Fuse:CAUTION120 volt potential exposure. Isolate the applianceand reconfirm power has been disconnectedusing a multimeter

IX - FLUSHING PROCEDURE FOR LIMESCALE REMOVAL FROM HEAT EXCHANGERThe amount of calcium carbonate (lime) released from water is in direct proportion to

X - PARTS BREAKDOWNDISASSEMBLED VIEW - CABINET53

X - PARTS BREAKDOWNDISASSEMBLED VIEW - INTERNALS54

X - PARTS BREAKDOWNDISASSEMBLED VIEW - INTERNALS55

X - PARTS BREAKDOWNDISASSEMBLED VIEW - ELECTRICAL56

PARTS LISTNumber Description Quantity001 Front Panel Assembly 1002 Casing Assembly 1003 Wall Installation Bracket 1004 Connection Reinforcement Panel

715 120v Valve Heater Assembly 1716 Anti-Frost Heater Clip 2717 Anti-Frost Heater Clip A 1718 Anti-Frost Heater Clip 1720 Power Supply Harness 1721 Fu

59Notes

6I - GENERAL INFORMATION (cont.)HOW TO USE THIS MANUALIt is intended for this manual to be used by qualified service personnel for the primary purpose

800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors)20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.33551869 Sisme

I - GENERAL INFORMATION (cont.)CUT-AWAY ILLUSTRATION7

I - GENERAL INFORMATION (cont.)SCHEMATIC ILLUSTRATION8

II - SPECIFICATIONS – GENERALType of appliance Temperature controlled continuous flow gas hot water systemOperation With/without remote controlsExhau