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L A S E RH E A T I N GS Y S T E M SSection 11-15 Fuel PumpThe fuel pump is mounted on top of the fuel sump. Thepump assembly consists of the pump solenoid and thecontrol circuit.Laser 300 Series: PART #20470219Laser 530 Series: PART #20470319Laser 560 Type A: PART #20470419Laser 560 Type B: PART #20470512Laser 730 Series: PART #20470619DescriptionA manual reset button allows the valve to resumeoperation after the heater has been moved.Fuel enters the constant level valve through an inlet atthe bottom. As the level of fuel rises, it passes through afuel inlet strainer which removes most particles andforeign matter from the fuel and then it flows up throughan open inlet valve and enters the tank. See Fig. 1-2.All Models: PART #20470234IMPORTANT: Within the valve, a float mechanismcontrols the level of fuel in the sump.As the fuel level drops, the float dropsdown to increase the inlet valveopening to admit more fuel into thesump. When the fuel level reaches itsmaximum volume, the float rises toshut the valve.1-16 Main Circuit BoardThe control circuit board provides safety timings,controls relays and provides clock and thermostatfunctions for the Laser Heater.Laser 300/ Laser 530: PART #20470212Laser 301/ Laser 302/ Laser 531/ Laser 532: PART #20471112Laser 560 Type A: PART #20470412Laser 560 Type B: PART #20470519Laser 730/ Laser 730AT: PART #20470612Laser 731/ Laser 732: PART #20471312In the event that fuel within the sumprises to an abnormally high level, thefloat within the sump rises. A tripmagnet pulls the float up and closesthe valve to prevent fuel from enteringinto the sump.1-17 Room Temperature SensorShould a foreign substance cause theinlet valve to stick (or prevent it fromopening), the reset button is utilizedto free the mechanism and to admitfuel to the sump.The room temperature sensor, which is capable ofsensing room temperatures within a range of 50 F (10 C)to 90 F (32 C), can be wall mounted.Approx. 8 feet (2.5 m) of wire is supplied with the sensorto facilitate wall mounting to a favorable location. Youcan also use speaker wire to extend the mountinglocation up to 20 feet (6m).The fuel inlet strainer should becleaned or replaced periodically. Timeintervals will depend on purity andquality of fuel.All Models: PART #20478373Sump1-18 Fuel(Fuel Constant Level Valve)The constant level valve has an automatic shutoff safetym e c h a n i s m t h a t p re v e n t s f u e l f ro m f l o o d i n g o roverflowing from the fuel sump.CAUTION:Care must be taken to prevent dust,dirt or other debris from clogging orblocking the inlet valve.Figure 1-2 FUEL SUMP (FUEL CONSTANT LEVEL VALVE) (Part #20470234)SERVICE MANUAL 3

L A S E RH E A T I N GS Y S T E M SSection 11-19 Cloth Covered Exhaust PipeInsulating cloth covers are to be placed over all metalsurfaces of the exhaust line during installation. Sincecombustion by-products are vented at elevatedtemperatures, the exhaust pipe will become hot duringoperation. The insulating cloth covers protect a the userfrom accidental contact burn with these hot metalsurfaces.All Models: PART #20474955IMPORTANT: Do not operate the heater without theinsulating covers. During installationmake sure that all exhaust lines arecompletely connected.1-20 Air Circulation Fan Filter (Cover)The fan filter (cover) is an integral part of the fanassembly and protects the user against physical injurywhich could occur from accidental contact with therevolving metal fan blade.(Laser 300 Series/ Laser 530 Series only)Laser 300 Series: PART #20479540Laser 530 Series: PART #204798401-21 FuseIn the event of a power surge or an internal wiringhazard, the fuses will open and power to the heater willbe cut off. The fuses are rated at 250 V AC, 10-ampsand 250 V AC, 5-amps.The electrical outlet into which the heater is connectedshould be protected by at least a 15-amp. fuse or circuitbreaker.All Models: PART #20470678 (5A)All Models: PART #20470679 (10A)1-22 Overheat Protector SwitchOverheat Protector Switch is rated at 194 F (90 C).Should a heater overheat (internal temperature risesbeyond 194 F (90 C)), the overheat protector switch(also called a high limit switch) will open to shut off theheater. Error code “E-12” will be displayed on the digitalindicator at this time. The overheat protector switch willautomatically reset after the heater has cooled down.Once the heater has cooled to 158 F (70 C), the systemcan be restarted manually as follows:4 SERVICE MANUALDescription1. Press ON/OFF button to “OFF”.2. Allow heater to cool down.3. Resolve the cause of the overheat.4. Press ON/OFF button to “ON” to start.The heater will start with normal operation.All Models: PART #204702061-23 Pressure Relief PlateThe pressure relief plate is located at the top part of theheat exchanger, which effectively prevents damagecaused by misfire.(Laser 300 Series/ Laser 530 Series only)Laser 300 Series/ Laser 530 Series: PART #204795301-24 Combustion SystemIn the combustion system a mixture of fuel and air isburned to produce heat. Air is drawn from outside thedwelling to the burner. At the same time, fuel is meteredfrom a storage tank into this same burner. Within theburner, the air/fuel mixture is ignited to produce heat.The Laser combustion systems are safeguarded by anoverheat protector switch that will shut down the heater(to protect it from damage) in the event of excessive heatbuild-up. The error code “E-12” will be displayed on thedigital indicator at this time. The overheat protectorswitch will be reset after the cooling down period. Turnthe ON/OFF button to “ON” again to restart.Model Laser 300 Series

L A S E RH E A T I N GS Y S T E M SSection 1DescriptionModel Laser 530 Series1-25 Forced Flue Venting SystemThe forced flue venting system channels air to and from theheater. Outside air is drawn into the heater by the combustionblower through the flue pipe and is blown into the burner. Itthen combines with the vaporized fuel and ignites.As the heated air passes through the heat exchanger, aroom air circulation fan blows air past the heat exchangerand out again into the room from the front of the heater.Exhaust vapors are vented out of the room through theflue pipe.1-26 Fuel Delivery SystemFuel moves by gravity from the external fuel storage orthe removable fuel tank (Laser 560 Series).Fuel must be maintained at the level corresponding tothe burn mode so that combustion can be conductedefficiently.The fuel pump controls the flow of fuel from the fuelsump to the burner through a copper fuel pipe and a fuelnozzle.Model Laser 560 Series1-27 Electrical SystemAll electronic diagrams, such as the wiring diagram, thecircuit board, and, layout, can be found in Section 6 ofthis Service Manual.1-28 Safety MechanismsSeveral safety mechanisms have been built into the LaserHeating System. These devices protect the user againstpersonal injury, protect the heater against damage,shutting down the heater and displaying an error code onthe digital indicator if a malfunction occurs.Model Laser 730 SeriesCirculation fanOverheat protectorHeat exchangerHeat chamberExhaust fanDraft pipeExhaust gas Flue pipeFuel nozzleBurner ringFuel pipeFlame sensorIntake fanIgniterIntake airBurnerBlower motorBurner matFuel pumpFuel sumpFuel strainerReset buttonSERVICE MANUAL 5

L A S E RH E A T I N GS Y S T E M SSection 1Description1-29 Power Failure Recovery SystemIf at any time a power failure occurs during operation, heater will turn off. When the power returns, the unit willautomatically restart with the following conditions. Please reset each setting when the settings are erased as indicatedbelow.TIME LENGTH OF POWERFAILURELESS THAN 3SECONDSMORE THAN 3 SECONDSIN BACKUP MEMORYOUT OF BACKUP MEMORYOPERATIONRestart the combustion with Start the combustion fromthe beginning.the same condition beforethe power failure.Start the combustion fromthe beginning.Set temperature will changeto 13 C (56 F) for safety.Set temperature and roomtemperature will blank thatat least more than 30 min.power failure has occurred.To stop the blinking the settemperature and roomtemperature, press anybutton once.POWER SAVEROPERATIONKeep the same conditionbefore the power failure.Keep the same conditionbefore the power failure.Keep the same conditionbefore the power failure.AUTO OPERATIONKeep the same conditionbefore the power failure.Keep the same conditionbefore the power failure.The setting will be erased.CHILD LOCK OPERATIONKeep the same conditionbefore the power failure.The setting will be erased.The setting will be erased.If at any time a power failure occurs when heater is not in operation, the unit will basically start the operation whilekeeping the same condition before the power failure. However, when the power failure continued more than 3 seconds,the following settings will be erased. Please reset each setting.WHEN HEATER IS NOT IN OPERATIONIN BACKUP MEMORYChild lock operationClock and Day settingOUT OF BACKUP MEMORY Auto operationChild lock operation6 SERVICE MANUAL

L A S E RH E A T I N GS Y S T E M SSection 11-30 Operation RecoveryIf the power is turned off during combustion/ operation,then it is possible continue operation by turning thepower button back on within 3 seconds. After 3seconds the heater needs to go through it’s preheatcycle, before turning back on. The circulation fan motorwill remain on during this time.1-31 Reigniting OperationStart to reignite (T1) from turning the operation buttonON if the reigniting time becomes over 3 seconds afterturning the operation button OFF during combustion.(Include the unit OFF from the Save Mode and TimerOperation Mode.) Also, the fan motor keeps operate inthis condition.1-32 Error Codes HistoryTo show the error codes history, first turn the unit off (ifnot already in off),then push the “ HOUR”and“ MIN”button at the same time for 3 seconds, and a buzzer willsound. To get out of the error codes history, press the“ HOUR”and“ MIN.”button again at the same time for3 seconds. This will indicate the past 9 error codes. Theerror codes are indicated as “XE YY”. (X stands for 1 9with 1 being the most recent. Error codes more then 9codes ago will be deleted. YY stands for the error codeor Altitude Setting – see High Altitude Setting Mode.)If you press the “ HOUR” button, the display shows“AL YY” ”9E YY” ···· ”1E YY” ”AL YY” ····If you press the “ MIN” button, the display shows“AL YY” ”1E YY” ···· ”9E YY” ”AL YY” ”1EYY” ····When the unit is turned ON during Error Codes History,the unit exits the Error Code History and starts normaloperation.1-33 Igniting Failure Error LockIf the igniting fault error “E-2” occurrs 3 times in a row,then the display will show “E-22”, and it is not able toreset by the power button but it can be reset byunpluging the power cord for at least 30 minutes.Thermistor Normal Detecting1-34 BurnerTemperaturesLaser 300 Series/ Laser 530 Series: above 120 C or248 F normalLaser 560 Series/ Laser 730 Series: above 100 C or212 F normalDescription1-35 Backup LifeBack up time is more than 30 minutes(reference value)The life guarantee is more than 10 years.1-36 Deleting The Error Code HistoryTo clear the error code history press the “AUTO” buttonfor 3 seconds while in the Error Codes History. Thedisplay will show “Er CL”, which will flash 3 times, andthen switch to time display.Laser 300/ Laser 530/ Laser 560 Series/ Laser 730/ Laser 730ATUse the “TIMER” buttons instead of the “AUTO” buttons.Same as above except for the buttons used.Laser 301/ Laser 302/ Laser 531/ Laser 532/ Laser 731/Laser 732of Abnormal Electrical1-37 DetectionFrequency ConditionWhen the electrical frequency of the power supplied tothe unit is abnormal and the power button is ON the unitwill display an error code of “E-0” and the unit will notstart. To reset turn the power button OFF and unplag.The judging range for the frequence is 55Hz or 65Hz.Normal frequence is 60Hz.1-38 Power Button MalfunctionIf there is a problem with the power button the unit willmake a buzzer beep sound , which will indicate that ashort circuit has occurred.If the power button short circuit condition occurs formore than 30 seconds, then the following happens: Flash all on display Flash the power LED Make a beep sound All buttons are invalid. No beep sound by pressingbuttons.1-39 Low Voltage DetectionThe unit will turn OFF with “E-0” when the low voltagecondition keeps for more than 10 seconds /- 2seconds.Laser 300/ Laser 530/ Laser 560 Series/ Laser 730/ Laser 730AT1-40 Forced Flame DetectionIf the flame is detected when the power button is turnedON or the unit comes back on from a power failure, theoperation lamp will flash and both the blower motorand circulation fan motor will turn to high revolution.SERVICE MANUAL 7

L A S E RH E A T I N GS Y S T E M SSection 1The heater will turn ON if the flame goes out within 30seconds from turning ON or returning back from powerfailure. The heater will be turned OFF for safety withthe error code of “E-23” if the flame is detected formore than 30 seconds. However, both the blower motorand circulation fan will continue to run on high, until theflame is no longer detected.1-41 Manual Ignitor Cleaning SystemWhen the power button is OFF, press the “SET” and“CLEAR” buttons at the same time for 3 seconds, the unitwill make a beep sound, indicating it is in Cleaning Mode.LCD display will show “CL: 10” “CL: 01” and make acountdown at every minute. The countdown is shown onthe right side of the indicator in double figures as “10, 09. 02, 01”. The blower motor turns at Low revolution whilethe igniter is on for ten minutes. When the “SET andCLEAR” buttons are pressed at the same time for 3seconds during the Manual Igniting Cleaning modes, theunit will make a beep sound and cancel Cleaning Mode. Ifthe unit is in the Manual Ignitor Cleaning mode and thepower button is turned ON then the cleaning mode will becancelled and the heater will turn on.Laser 300 / Laser 530 / Laser 560 Series / Laser 730/ Laser 730ATUse the “TIMER” and “CHI LD” buttons instead of the“SET” and “CLEAR” buttons. Same as above except forthe buttons used.Laser 301/ Laser 302/ Laser 531/ Laser 532 / Laser 731/Laser 7321-42 Automatic Ignitor Cleaning SystemThe heater will turn OFF automatically when the timebecomes 2 AM during operation. After the post purgefinishes, the ignitor will be turned on and the blowermotor turns at Low revolution for cleaning operationmode. LCD display will change to show as “CL:10” “CL:01” and make a countdown at every minute. Thecountdown is shown on the right side of the display as“10, 09 . 02, 01”. After the countdown finishes the unitwill shift back to normal operation.If you cut the “CL” jumper wire on the main circuit board,this function will not work.Laser 300 / Laser 530 / Laser 560 Series / Laser 730/ Laser 730ATWhen the power button is OFF, press the “ MIN.” and“TIMER” buttons at the same time for 3 seconds, theunit will make a beep sound, this function will not work.If you do the same operation again, this function willwork.Laser 301/ Laser 302/ Laser 531/ Laser 532 / Laser 731/Laser 7326S SE ERRV VI CI CE E MMAANNUUAALL8Description1-43 Manual Fuel Pump Operation ModeTo put the unit in Manual Fuel Pump Operation Mode,first have the power button “ON”, and then push andhold the “ HOUR” and “ MIN.” button at the same timefor 3 seconds. A buzzer sound will happen. To return tonormal operation push these buttons again at the sametime for 3 seconds, the unit will then shift back to theNormal Operation Mode and will make a buzzer sound.Manual Fuel Pump Operation Mode cannot be cancelledby turning off the power button. The unit will turn off,however, when unit is turned back on it will be in ManualFuel Pump Operation Mode again.Combustion Indicator.P3: High Combustion P2: Middle Combustion P1: LowCombustionNormal oom TemperatureValue1ManualFuel PumpOperation ModeCombustionIndicatorBurner TheremistorTemp. AD Value2Flame Electric CurrentAD ValueThe first display in the SET field is the CombustionIndicator which starts as “P3”. To change down to P2use the “ HOUR” button, and to change up use the “ MIN.” button. There are 2 kinds of sub modes in ManualFuel Pump Operation Modes. To shift into these modespush the “TIMER” button for 5 seconds. Room displaycan be switched between the Burner ThermistorTemperature AD Value and Flame Electric Current ADValue by pressing the “DAY SELECT” button. The firstdisplay is the Burner Thermistor Temperature AD Value(BTTADV) mode and is indicated by a flashing C in thebottom right corner. The Flame Electric Current AD Value(FECADV) is indicated by a flashing F top right side.Both BTTAD Value and the FECAD Valve are alwaysupdating and are shown on the display. The colon “:”symbol will flash indicating preheat mode. Once unitreaches it set pump mode “:” will disappear.Laser 300 / Laser 530 / Laser 560 Series / Laser 730/ Laser 730ATThe first display in the SET field is the CombustionIndicator which starts as “P3”. To change down to P2

L A S E RH E A T I N GS Y S T E M SSection 1use the “ HOUR” button, and to change up use the“ MIN.” button. There are two kinds of sub modes inManual Fuel Pump Operation Modes. To shift into thesemodes push and hold the “TIMER” and “CHILD LOCK”button at the same time for 3 seconds. Room displaycan be switched between the Burner ThermistorTemperature AD Value and Flame Electric Current ADValue by pressing the “TIMER” button. The first displayis the Burner Thermistor Temperature AD Value (BTTADV)mode and is indicated by a flashing C in the bottomright corner. The Flame Electric Current AD Value(FECADV) is indicated by a flashing F top right side.Both BTTAD Value and the FECAD Valve are alwaysupdating and are shown on the display. The colon “ : ”symbol will flash indicating preheat mode. Once unitreaches it set pump mode “ : ” will disappear.Laser 301/ Laser 302 / Laser 531/ Laser 532/ Laser 731/Laser 7321-44 High Altitude Setting ModeAll units are shipped from factory with the altitude settingat Low. To change the Altitude Setting, turn the unit off (ifnot already off), press the “ HOUR” and “ MIN.” buttonat the same time for 3 seconds (this is the same forgetting into the Error Codes History), then press the“ HOUR” button once. The display will show “AL Lo”.Press the “AUTO” and “TIMER” button at the same timefor 3 seconds. The display will show “AL Hi”, flash for 3times, and then shift to off mode. If the power button isturned on when flashing “AL Hi” the display will switchfrom “AL Hi” flashing to temperature and start normaloperation. To switch back to Lo altitude setting repeat thesteps above.When switching to Hi altitude setting mode, the fuelpump flow rates levels will all be switched to Level 1 (seeFlow Volume Setting Mode for the Fuel Pump below),which is a 10% decrease in fuel flow. In the high altitudesetting mode “AL Hi” the fuel flow rate is L1 1, L2 1,L3 1. The Lo altitude setting mode is 5 (meaning fuelflow rates are L1 5, L2 5, L3 5).If the fuel pump flow rate setting mode is changed toL1 1, L2 1, L3 1, it is shifted to “Hi” altitude settingmode automatically.Laser 300/ Laser 530/ Laser 560 Series/ Laser 730/ Laser 730ATAll units are shipped from factory with the altitude settingat Low. To change the Altitude Setting, turn the unit off (ifnot already off), press the “ HOUR” and “ MIN.”button at the same time for 3 seconds (this is the sameDescriptionfor getting into the Error Codes History), then press the“ HOUR” button once. The display will show “AL Lo”.Press the “ MIN.” and “TIMER” button at the same timefor 3 seconds. The display will show “AL Hi”, flash for 3times, and then shift to off mode. If the power button isturned on when flashing “AL Hi” the display will switchfrom “AL Hi” flashing to temperature and start normaloperation. To switch back to Lo altitude setting repeatthe steps above.When switching to Hi altitude settingmode, the fuel pump flow rates will 10% decrease in fuelflow.Laser 301/ Laser 302 / Laser 531/ Laser 532/ Laser 731/Laser 7321-45 Combustion Cleaning ModeWhen the unit is in the high combustion for more than 2hours continuously, it will automatically shift to lowcombustion for 5 minutes. During Combustion Cleaningmode the unit will change to medium combustion for 30seconds, then to low combustion for 4 minutes, andback to medium combustion for 30 seconds, and then tohigh combustion. The display will show “CL:05”. Thecountdown is shown on the right side of the display indouble figures as “04, 03, 02, 01”.Volume Setting Mode for The1-46 FlowFuel PumpTo adjust the Fuel Pump Flow Rate, first get in the FlameElectric Current AD Value (FECADV) (see Manual Fuel PumpOperation Mode above) then press both “CLEAR” and“DAY SELECT” buttons at the same time for 3 seconds.There are 3 fuel pump modes high, medium, and low,and each mode can be set to 9 levels.Low combustion mode L1 LMedium combustion mode L2 M, M1, M2High combustion mode L3 H, H1Fue

Plus, the Laser is easy to maintain and require minimal service. The following section outlines the Laser Heater and its various components 1-2 Physical Specifications W D H (inches) Weight Flue Pipe Hole Laser 300 Series 17-3/8" 21-3/4" 15-1/8" (440 555 385 mm) 31 lbs. (14kg) 2-3/4 to 3" diameter (7.0 - 7.5 cm) Laser .