White Outdoor FUEL HD120 User's Manual
Contents
1. GAS CONTROL HI LO a Gas Pressure Checks C Reading Pressures With the heater operating the pressure gauges should read the pressures specified on the dataplate Do the readings at the inlet and outlet pressure gauges agree with that specified on the dataplate If so then no further checking or adjustment is required Proceed to section D If the inlet pressures do not agree with that specified on the dataplate then the regulator controlling gas pressure to the heater requires adjustment If the inlet pressure is correct but the burner manifold pressure does not agree with that specified on the dataplate then the HI and LO heat output feature of the gas control valve requires adjustment Turn the thermostat down to its lowest setting Remove the cap from the HI and LO heat adjusting screws at the two stage pressure regulator on the gas control valve Slowly turn up the thermostat until the valve opens in first stage position and a pressure is read of no greater than 1 3 in W C L P or 8 in W C N G at the outlet pressure gauge If less than 1 3 in W C L P or 8 in W C N G is read the LO heat setting at the regulator on the gas control will require adjusting Turn clockwise to increase or counterclockwise to decrease Turn the thermostat completely up You should see the valve open at second stage position and th2. BUIOJd IY YOUMS 8 YOUMS 0949 2 YONIS YOUMS S sulpulg YOUMS SI sind9O UONIPUOD 8 9 5 4 910 pue 0 5 JO BULIM 033 Suayeoug NID A ddng je014309 9 49949 SBEN SAPAA say BUJII uous 19 29H 0 p ljddns gey oA 51 10 030 ejd y JO JOJO SOA lt 51 Heys 101 18S ip 38007 084 S YOUMS Boe dayY jo dy JO 1 yoaug guado yong YOUMS BUMOId IY S seznul 8 Sou peog Sq
3. Remove black lead at terminal 4 to selector switch Add contacts at terminals 1 and 4 VENT MODE CONTACTS YATIOWLNOD OL Y3ATIOWLNOO Heat Vent Building Control Connections Using Powered Contacts Remove jumper at terminals 1 and 2 Remove black leads at terminals 3 and 4 to selector switch Remove white leads at terminal 6 to selector switch Add neutral s of control contacts at terminal 5 HEAT MODE Add control power at terminal 3 VENT MODE Add control power at terminal 4 SLIHM TERMINAL STRIP HEAT BLACK WHITE VENT SELECTOR SWITCH ANJA 4 NEUTRAL S FROM CONTROL POWER 1091302 JUMPER Always use approved pipe thread compound suitable for use with L P gas or natural gas on the threaded connections Assemble the components together according to the figure This view is to show general assembly of the components only The regulator must always be mounted so its vent regardless of location on the regulator is always pointed downward Tighten all connections securely and check for gas leaks MANUAL SHUT OFF VALVE HOSE AND REGULATOR ASSEMBLY FIG 5 SECOND STAGE REGULATOR REGULATOR VENT NIPPLE MANUAL T SHUT OFF N ADAPTER TO CONTROL i SED
4. Se 10 8 pue SUISNOH UO uny 10N Ajquiassy 4 pue 104 2949 UPS S 4 JOU SI gey on 30030009 Jalsa 6 194014 LNA 941 01 YOUMS 1012 5 5 10108 96 12913999 y MOW ul 1 168 8 YOUMS 10199 Jojo 01195 u passnid uny ION a8e 0A 10199195 1 1070W Electrical Connection and Ladder Diagram CAUTION REFER TO THE HEATER S ELECTRICAL CONNECTION DIAGRAM WHEN SERVICING TO AVOID WIRING ERRORS AND HEATER MALFUNCTION CHECK FOR PROPER OPERATION AFTER SERVICING WARNING THIS HEATER MAY START AT ANY TIME OPTIONAL THERMOSTAT WHITE TBLACK BURNER GROUND HIGH LIMIT SWITCH IGNITER FLAME SENSOR AIR PROVING SWITCH BURNER HIGH VOLTAGE GROUND IGNITION LEAD ELECTRICAL CONNECTION DIAGRAM DIRECT SENSE IGNITER OFF HIGH LIMIT VENT SWITCH SELECTOR SWITCH 7 8 GAS VALVE SOLENOIDS AIR PROVING SWITCH TOYLNOD ISG LOW j HEAT NEUTRAL THERMOSTAT TRANSFORMER GROUND EL
5. eaten ahs 10 Manual Shut Off Valve Hose and Regulator Assembly 1 5 5 12 Start Up INStructionS ces deh 13 ShutEDOwn Instructions ers Gide es a ees whedon tee ee ee 13 Cleaning INStructiOnS eve see eee eee bee RO aE tea ee ele eae 14 Maintenance INStructions isc he lite eg tain ied Bae 14 Service Instructions General weed owe nee seyret ewe ete be awe ew eA 15 Motor amp Ean Assembly wide thee eee gee 15 Air Proving SWIC le ee 15 Flapper AGJUStMENE eu yes 16 Igniter amp Fame SENSON tad ete Ag Abe 16 Removing Control Box and Wire Harness 17 Testing the Manual Reset High Limit Switch 17 Gas Pressure CNeCKS ae ees ea Boe oe ele th de Bee wed we eda eee 18 Troubleshooting IMStruCtiOns eee ee eee ee
6. 59011 04 525 ANA seg E JO SOJIM or NN OF SHOA 0 ded Y09949 paliddns S 2 peddey suado ALA lt a A sadOld SOK aiqipny 165 pinoys Yun WNL JoUS S 525 0 HONYS 560 u do 19 2 H 0 ASOU se5 1 128 BES 9 54 220 5 5 ANY pue ainssald 520 aseyoA 4 95001 104 2949 19 e H sulgag 61 UBIH Jo sep 51 jan4 51 waned 45214 pue 2U 19594 SOUT paddy S YOUMS PWT H 34 25 128
7. Owner s Manual and Instructions GreenGro Plus Greenhouse Heaters MODELS OUTPUT FUEL ED creencro120 Available in either HD120 120 000 L P Gas Vapor Withdrawal or Natural Gas Configurations a a ITT HHH see 5 6 OF Congratulations You have purchased the finest direct fired greenhouse heater available Your new L B White heater incorporates the benefits from the most experienced manufacturer of heating products using state of the art technology We at L B White thank you for your confidence in our products and welcome any suggestions or comments you may have call us toll free at 1 800 345 7200 ATTENTION ALL USERS This heater has been tested and evaluated by C S A International in accordance with IAS U S Requirements for Gas Fired Greenhouse Heaters for use as a direct gas fired circulating heater for the heating of greenhouses If you are considering using this product for any application other than its intended use then please contact your fuel gas supplier or the L B White Co Inc Quality heaters you can count W6636 L B White Rd Onalaska 54650 800 345 7200 608 783 5691 608 783 6115 fax info lbwhite com 150 23487 A AX GENERAL HAZARD WARNING Failure to comply with the precautions and instructions provided with this heater can result in Death Serious bodily in
8. Connect thermostat to terminals 8 and 9 GROUND THERMOSTAT BLACK Building Controller Connections Heating Using Non Power Contacts 1 Operate on first stage heat only Remove jumper at terminals 8 and 9 Connect controller contacts in terminals 8 and 9 RETURN FROM CONTROLLER TO CONTROLLER FIRST STAGE HEAT CONTACT 2 Operate on second stage heat only Remove jumper at terminals 8 and 9 Move jumper to terminals 9 and 10 Connect controller contacts at terminals 8 and 9 RETURN FROM CONTROLLER TO CONTROLLER FIRST STAGE HEAT CONTACT 3 Operate both stages of heat Remove jumper at terminals 8 and 9 Connect controller contacts at terminals 8 and 9 first stage heat Connect controller contacts at terminals 9 and 10 second stage heat Supply an electrical connection jumper between relays in building control to allow staging transition of gas control valve RETURN SECOND STAGE HEAT CONTACT FROM CONTROLLER RETURN FROM CONTROLLER TO CONTROLLER FIRST STAGE HEAT CONTACT Heat Vent Building Control Connections Using Non Powered Contacts Remove jumper at terminals 1 and 2 HEAT MODE Remove single black lead at terminal 3 to selector switch Add contacts at terminals 1 and 3 HEAT MODE CONTACTS YATIOWLNOD OL Y3TIOWLNOO TERMINAL
9. SUPPLIER IMMEDIATELY DO NOT WAIT Do not attempt to install repair service this heater or the gas supply line unless you have continuing expert training and knowledge of gas heaters Qualifications for service and installation of this equipment are as follows a To be a qualified gas heater service person you must have sufficient training and experience to handle all aspects of gas fired heater installation service and repair This includes the task of installation troubleshooting replacement of defective parts and testing of the heater You must be able to place the heater into a continuing safe and normal operating condition You must completely familiarize yourself with each model heater by reading and complying with the safety instructions labels Owner s Manual etc that is provided with each heater b To be a qualified gas installation person you must have sufficient training and experience to handle all aspects of installing repairing and altering gas lines including selecting and installing the proper equipment and selecting proper pipe and tank size to be used This must be done in accordance with all local state and national codes as well as the manufacturer s requirements All installations and applications of L B White heaters must meet all relevant local state and national codes Included are L P gas natural gas electrical and safety codes Your local fuel gas supplier a local licensed ele
10. and away from the area immediately Close all propane LP gas tank or cylinder fuel supply valves or the main fuel supply valve located at the meter if you use natural gas Propane LP gas is heavier than air and may settle in low areas When you have reason to suspect a propane leak keep out of all low areas ODOR FADING NO ODOR DETECTED Some people cannot smell well Some people cannot smell the odor of the man made chemical added to propane LP or natural gas You must determine if you can smell the odorant in these fuel gases Learn to recognize the odor of propane LP gas and natural gas Local propane LP gas dealers and your local natural gas supplier utility will be more than happy to give you a scratch and sniff pamphlet Use it to become familiar with the fuel gas odor Smoking can decrease your ability to smell Being around an odor for a period of time can affect your sensitivity to that particular odor Propane LP gas and natural gas have a distinctive odor Learn to recognize these odors Reference Fuel Gas Odor and Odor Fading sections above If you have not been properly trained in repair and service of propane LP gas and natural gas fueled heaters then do not attempt to light heater perform service or repairs or make any adjustments to the heater on propane LP gas or natural gas fuel system Natural gas is lighter than air and can collect around rafters or ceilings Use your neighbor
11. the clearance specified in the table below before tightening the fan wheel to the motor shaft b Make sure that set screw s of the fan are on the flats of motor shaft when tightening FAN WHEEL MOTOR le CLEARANCE 1 8 IN FIG 9 FAN HOUSING PANEL SCREW 2 SWITCH NUTS 2 FLAPPER ADJUSTMENT 1 Ensure there is not any dust dirt etc that may cause binding on the pivot points of the flapper If debris is found use a soft brush or compressed air to clean the area as necessary 2 The arm of the flapper should engage the arm of the airflow switch when the trailing edge of the flapper body is lifted and is at the proper clearance distance off the blower housing bottom At this distance you will hear a click which are the contacts closing within the switch mechanism 3 If the switch contacts do not close within this distance manually push in the arm in the switch to make sure the switch is not defective If a click is heard the switch is generally considered good However to ensure switch contacts do close perform a continuity test FIG 10 BLOWER OUTLET OF HEATER AIR PROVING SWITCH ARM OF FLAPPER AIR PROVING SWITCH ARM If the switch is not defective the flapper arm may need adjustment to engage the switch arm Using a needle nose pliers gently bend up the arm of the flapper NOT THE SWITCH ARM in increments until the flapper arm engages the switch arm closing the contac
12. upon as being sufficient to provide the necessary air exchange within the greenhouse Proper installation of the GreenGro greenhouse heater must include provision for adequate air exchange as follows Indoor Mounted Heater An exhaust fan capable of providing at least 300 cfm of discharge air inlet shuttered louver of at least 120 sq in area The inlet shutters must be electromachanically operated and electrically interlocked with the heater such that the heater can not operate if the inlet shutters do not open when heating is required Outdoor Mounted Heater An exhaust shuttered louver of at least 120 sq in area The exhaust shutter must be electromechanically operated and electrically interlocked with the heater such that the heater can not operate if the exhaust shutters do not open when heating is required 1 Read all safety precautions and follow L B White recommendations when installing this heater If during the installation or relocating of heater you suspect that a part is damaged or defective call a qualified service agency for repair or replacement 2 Make sure the heater is properly positioned before use and is hung level Observe and obey all minimum safe distances of the heater to the nearest combustible materials Minimum safe distances are given on the heater nameplate and on page 4 of this manual 3 The heater may be used either indoors or outdoors For heaters intended for outdo
13. valve thereby providing low or high heat depending on thermostat setpoint Transformer Electrical control used to accept line power supply primary voltage and reduce it to lower secondary voltage to operate certain control systems ALYY QO AY AY ROOK i V Parts Identification PARTS LIST Item Description Part Number Al Regulator LP Gas 2nd Stage Vent Over Outlet 06553 Regulator LP Gas 2nd Stage Vent Over Side 06665 Regulator Natural Gas 5 PSIG Inlet 13 5 Outlet 23360 2 Nipple 3 1 2 in 07148 3 Valve Manual Shut Off 05548 4 Hose 1 2 in ID x 10 ft with Adapter 20714 5 Adapter Hose 1 2 NPT x 1 2 NPS 02894 6 Kit Sediment Trap 00815 7 Base 23523 8A Bracket Gas Control Valve 21768 8B Screw 8 32 x 1 4 09425 9 Valve Gas Control LP Gas 23835 Valve Gas Control Natural Gas 23836 10 Nipple 1 2 in x 3 in 02972 11 Elbow 01426 12 Manifold 09291 13 Orifice Burner LP Gas 23530 Orifice Burner Natural Gas 23531 14 Burner 21724 15 Spacer 02687 16 Igniter and Sensor Assembly 22473 17 Switch High Limit 05566 18 Chamber Heat 23566 19 Case Assembly with Doors and Latches 2 20465 20 Latch Assembly 20959 21 Harness Wiring 23534 22 Control Ignition 22461 23 Transformer 120 24 v 81218 24 Cover Control Box w Hinge amp Window Plug 23550 25 Boot Selector Switch 09916 26 Selector Switch 09915 27 Terminal Strip 22905 28 Cord Power 10 ft 23574 29 O Ring 08347 30 Plug
14. will not be on when the selector switch is positioned to VENT Heating Mode Problems Page L E D is constant on No flash pattern 20 L E D light is eanne ea aaa 20 L E D diagnostic light is flashing AS ONG sie Rk 21 B TW feces reed a wel 22 Three TIMES 23 BAe ete 23 Ventilation Mode Problems Page A Motor Does Not 24 B Motor Hums Does Not 24 Components should be replaced only after each step has been completed and replacement is suggested in the flow chart Refer to the Servicing sections as necessary to obtain information on disassembly and replacement procedures of the component once the problem is identified by the flow chart DIRECT IGNITION OPERATION SEQUENCE Selector switch is set to heat Line voltage is sent to ignition control and to transformer Red L E D on selector switch is illuminated Transformer reduces line voltage to 24 volts which is sent to thermostat The thermostat calls for heat The thermostat sends 24 volts to ignition control Ignition control module performs self safety check Internal components are tested Air proving circuit is checked Ignition control module begins ignition trial sequence Ignition control module sends 24 volts to air proving switch Ignition
15. E TOP 2 Be sure heater is securely fastened to overhead supports and is hanging level Check crosswise and lengthwise 3 See Fig 3 for typical indoor installation In any installation consideration must be given to making sure the heater is located away from the people entering or exiting the greenhouse so they cannot accidentally knock the heater or tamper with the heater and its gas supply line in any way Additionally the heater must be located so that it does not block the normal entryway or exit of the building Make sure you observe and obey minimum clearance distances to combustible materials as stated in the specification section of this owner s manual and on the heater s dataplate POWERED EXHAUST FAN 1 FT CLEARANCE ey BACK OF HEATER TO WALL 1 SHUTTERED AIR INLET ENTRY EXIT HEATER LA SUPPORTED BY 77 METAL FRAME an 22 OF GREENHOUS X A SEDIMENT TRAP GAS HOSE MANUAL SHUTOFF VALY SECOND STAGE REGULATOR VENT POINTED DOWN GAS SUPPLY LINE NIPPLE a HOSE ADAPTER m TEE TO GAS CONTROL 4 NIPPLE D CAP GROUND THERMOSTAT Single Stage Thermostat 1 Operate on first stage heat only Remove jumper at terminals 8 and 9 Connect thermostat to terminals 8 and 9 GROUND THERMOSTAT BLACK 2 Operate on second stage heat only Remove jumper at terminals 8 and 9 Move jumper to terminals 9 and 10
16. ECTRICAL LADDER DIAGRAM BURNER GROUND IF ANY OF THE ORIGINAL WIRES AS SUPPLIED WITH THE HEATER MUST BE REPLACED IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE RATING OF AT LEAST 302 F 150 Air Proving Switch Safety device used to insure that the proper air flow is being achieved before the gas valve is opened Burner Cast iron component used to channel gas and provide an area at which the fuel may ignite Burner Orifice Brass metering device used to feed gas to burner ata specific rate Direct Spark Ignition Control Module Electronic printed circuit board which sends and receives voltages to various controls in an automatic ignition system An important safety feature of the control board is that it will shut down the entire heater thereby stopping the flow of fuel gas if burner flame goes out Fan Housing Chamber used for delivering air for efficient air movement Fan Wheel Component used in conjunction with the motor and fan housing to pull the hot air from heater and blow it into room for heating also known as a squirrel cage Gas Control Valve Electrical device consisting of a low pressure regulator and electrical solenoids used for the control of gas flow to the burner assembly A feature of the control valve is it s ability to modulate from a first stage minimum heat position to a second stage maximum heat position if needed to satisfy the temperature requirements of the greenhouse Thi
17. EST EQUIPMENT REQUIRED The following pieces of test equipment will be required to troubleshoot this system with minimal time and effort e Digital Multimeter for measuring voltage and resistance Low Pressure Gauge for checking inlet and outlet pressures at the gas control valve against dataplate rating INITIAL PREPARATION Visually inspect equipment for apparent damage Check all wiring for loose connections and worn insulation Refer to the system operation sequence in this section to gain an understanding as to how the heater operates during a call for heat Understanding the sequence of operation of the ignition module and related components is essential as it relates directly to problem solving provided by the flow charts The ignition control module is self diagnostic The red light located within the selector switch will flash a specific pattern depending upon the problem which is diagnosed To effectively use the flow charts you must first identify what the problem is by the light pattern of the L E D light emitting code diagnostic light If the light is flashing the flash pattern will be followed by a pause and then a repeat of the flash pattern until the problem is corrected Refer to the following tables to identify what page to refer to when troubleshooting any problems The light will only be on when the selector switch is positioned to HEAT and the thermostat or controller is calling for heat The light
18. IMENT VALVE INLET Start Up Instructions For initial start up after heater installation follow steps 1 6 For normal start up simply set the thermostat above room temperature 1 FIG 6 Connect electrical cord to an approved electrical outlet Set thermostat to desired room temperature This heater has a manually operated toggle style selector switch located on the top of the control box Open the fan motor access panel to view This switch allows you to either heat or ventilate no heat See Fig 6 for selector switch positions HEAT UP OFF MID VENT DOWN A Heating Open all manual fuel supply valves Check for gas leaks using an approved leak detector The gas control valve on the heater has a manual shut off feature incorporated into the valve assembly Make sure the indicator on the valve is turned to the on position See Fig 7 When the selector switch is positioned to heat the red light on the ignition control will be on At this point the motor will start the igniter will spark and ignition will occur The heater will cycle based upon interconnected control system FIG 7 B Ventilation When the selector switch is positioned to vent the red light will NOT be on The fan motor will start but the igniter will not spark nor will ignition occur This feature is used typically when heat is not needed but air circulation is required To discontinue the ventilation featur
19. Window 08255 31 Motor 1 3 HP Ball Bearing 20169 32 Mount Motor 08647 33 Wheel Fan 09050 34 Switch Air Proving 02680 35 Flapper 21035 36 Complete Fan Housing Assembly 20148 w Motor Fan Wheel Air Proving Switch Flapper and Motor Mount 37 Screw Burner 02688 38 Washer 01589 39 Bolt 02692 40 Grommet w Hole 21851 1 Complete control box assembly with all control components is part number 23539 2 Specify model number and fuel type when ordering 3 Screw part number 07288 8 x 3 8 is the standard fastener used for assembly of all sheet metal components Warranty Policy HEATER L B White Co Inc warrants that the component parts of its heater are free from defects in material and workmanship when properly installed operated and maintained in accordance with the Installation and Maintenance Instructions safety guides and labels contained with each unit If within 12 months from the date of purchase by the end user any component is found to be defective L B White Co Inc will at its option repair or replace the defective part or heater with a new part or heater F O B Onalaska Wisconsin PARTS L B White Co Inc warrants that replacement parts purchased from the company and used on the appropriate L B White equipment are free from defects both in material and workmanship for 12 months from the date of purchase by the end user Warranty is automatic if a component is found defective within 12 month
20. YNI uous 0 Se yoayg Aiddns SHOA YZ BV OJ 0005 pue 91 98 3 49949 129113993 104 42949 p109 1 M0d 1 W10JSULIL J WJOJSULIL 104 SANV SHOA S 8 01009 196 3 0 YNIMS 10 28 10198 10 ae Pied 109195 195 45614 995 gt 0 S 14311 3 01195 YMS UO ION S 34811 031 Jayeay 500 suluuny S 10199125 S PULION JO YOUMS 01 95001 JO SIM 8 50 pue YOUMS
21. and brush or blow off the fan wheel Additionally ensure the burner casting and orifice are free of dust accumulation insect nests webs etc The area surrounding the heater shall be kept clear and free from combustible materials gasoline and other flammable vapors and liquids Have your gas supplier check all gas piping annually for leaks or restrictions in gas lines Regulators must be periodically inspected to make sure the regulator vents are not blocked Debris insects insect nests snow or ice on a regulator can block vents and cause excess pressure at the heater Regulators can wear out and function improperly Have your gas supplier check the date codes on all regulators installed and check delivery pressures to the heater to make sure that the regulator is reliable AX WARNING Do not use a pressure washer water or liquid cleaning solution on any heater components Use of a pressure washer water or liquid cleaning solution on the control components can cause severe personal injury or property damage due to water and or liquids In electrical components and wires causing electrical shock or equipment failure On gas control valves causing corrosion which can result in gas leaks and fire or explosion from the leak Clean all internal components of the heater with pressurized air a dry brush or a dry cloth Maintenance Instructions 5 Check all wiring associated terminals and electrical components w
22. control sends 120 volts to motor Fan motor starts Air proving switch closes and 24 volts are returned to the ignition control module Ignition control module sends high voltage to the igniter electrode Igniter sparks Ignition control module sends 24 volts to the gas control valve through the high limit switches Gas control valve opens Ignition occurs Igniter continues to spark until flame proving occurs Ignition spark is cut off Gas valve stays open Gas control modulates to first or second stage heating based upon thermostat setting Room warms to desired temperature Temperature control is satisfied Heater shuts down Process starts again on call for heat IGNITION FAILURE SEQUENCE Trial for ignition takes approximately 10 seconds If ignition module does not sense a flame within the ignition trial the module goes into safety lockout 3 flash pattern Gas valve closes Ignition spark shuts off Fan motor stops To retry for ignition the system must be reset Turn the thermostat down and then up to call for heat or unplug heater and plug it back in or Position selector switch to off and then back on 10 SIM JO 1 3 100d 20 p109 yoayg 5 601 309 9
23. ctrician the local fire department or similar government agencies or your insurance agent can help you determine code requirements a For U S A installations and applications ANSI NFPA 58 latest edition Standard for Storage and Handling of Liquefied Petroleum Gas and or ANSI Z223 1 NFPA 54 National Fuel Gas Code ANSI NFPA 70 National Electrical Code Do not move handle or service heater while in operation or connected to a power or fuel supply This heater may be installed in areas subject to washdown This heater may only be washed on the external case assembly see Cleaning Instructions Do not wash the interior of the heater Use only compressed air soft brush or dry cloth to clean the interior of the heater and it s components After external washdown do not operate this heater until it is completely dry In any event do not operate the heater for at least one hour after external washdown For safety this heater is equipped with a manual reset high limit switch and an air proving switch Never operate this heater with any safety device that has been bypassed Do not operate this heater unless all of these features are fully functioning 10 11 12 13 14 15 16 Do not operate the heater with its door open Do not locate fuel gas containers or fuel supply hoses anywhere near the blower outlet of the heater Do not block air intakes or discharge outlets of the heater Doing s
24. d away In any event do not relight for at least 5 minutes In a hanging type installation rigid pipe or copper tubing coupled directly to the heater may cause gas leaks during movement and therefore must not be used Use only gas hose assemblies that are rated and approved for L P gas and natural gas in a hanging type of installation Installations not using the gas hose supplied with this appliance must connect dimensionally using American National Standard Wrought Steel and Wrought Iron Pipe B36 10 1970 Aluminum piping or tubing shall not be used Copper tubing when used for conveying natural gas shall be internally tinned or equivalently treated to resist sulphur Installation Instructions GENERAL Direct fired heaters discharge combustion by products with the heated air in to the area being heated These include NO and Ethylene These gases can result in harm to the worker or the plants The GreenGro greenhouse heater has been specifically developed for very low levels of these combustion by products However it is necessary to have an exchange of air within the greenhouse to avoid accumulation of these gases to a harmful level over an extended period of operating time Greenhouses have a natural air leakage factor This natural leakage is influenced by the design and physical condition of the greenhouse as well as wind conditions and other factors This natural leakage factor can not be relied
25. dden leaks that could cause flashback 11 12 13 With the main burner in operation check all connections hose connections fittings and joints as well as the gas control valve inlet and outlet connections with approved gas leak detectors leak is detected check the components involved for cleanliness in the thread areas and proper application of pipe compound before further tightening Tighten the gas connection as necessary to stop the leak If necessary replace the parts or components involved if the leak cannot be stopped Ensure all gas leaks have been identified and repaired before proceeding A qualified service agency must check for proper operating gas pressure upon installation of the heater Light according to instructions on heater or within owner s manual It is extremely important to use the proper size and type of gas supply line to assure proper functioning of the heater Contact your fuel gas supplier for proper line sizing and installation Optional air diverters can be installed in the heater outlet to provide direction to the heated air as it exits the heater Installation options include installing the diverters in such a way as to broadly distribute the air in two 45 degree paths or to focus the air flow in one A5 degree direction See Fig 1 The air diverters may require hand forming prior to installation Make 90 degree bends utilizing the performations provided Dive
26. e position the switch to off or heat or use the interconnected contacts customer supplied to accomplish this task C Off Position the switch to midpoint ATTENTION 4 It is normal for air to be trapped in gas hose on new installations The heater may attempt more than one trial for ignition before air is finally purged from line and ignition takes place The direct spark ignition DSI control board within this heater is self diagnostic The board works in conjunction with a light emitting diode L E D built into the selector switch The L E D will flash a specific continuous flash pattern depending on a problem that occurs Match the specific flash pattern given by L E D to the troubleshooting label applied to inside of burner cap access panel of the heater The troubleshooting label identifies the causes of the problem as it relates to specific flash pattern and remedies to correct the problem See also Troubleshooting Data within this Owner s Manual The gas control valve in this heater is a two stage control When a call for heat occurs the valve will open to its first stage rate Depending upon temperature requirements and temperature control setting the valve will then either remain at first stage heat rate before the temperature control is satisfied or the valve will open completely to its second stage capacity If the valve opens to its second stage capacity it is designed to revert back to its first stage h
27. e ee rele 19 Electrical Connection and Ladder Diagram 25 Heater Component Function teen ee eens 26 Parts Identification Parts List amp Schematic 27 amp 28 Warranty Polley r a on a EAA 29 Replacement Parts and Service pressure ai E E eee eee eee eee eee 29 General Information This Owner s Manual includes all options and accessories commonly used on this heater However depending on the configuration purchased some options and accessories may not be included When calling for technical service assistance or for other specific information always have model number configuration number and serial number available This information is contained on the dataplate This manual will instruct you in the operation and care of your unit Have your qualified installer review this manual with you so that you fully understand the heater and how it functions The gas supply line installation installation of the heater and repair and servicing of the heater requires continuing expert training and knowledge of gas heaters and should not be attempted by anyone who is not so qualified See page 6 for definition of the necessary qualifications Contact your local L B White distributor or the L B White Co Inc for assistance or if you have any
28. e gas pressure increase from 1 3 in W C L P or 8 in W C N G at first stage heat to 5 2 L P or 3 1 in W C N G second stage heat If less or greater than 5 2 in W C L P or 3 1 in W C N G the HI heat setting must be adjusted clockwise or counterclockwise accordingly until proper pressure is achieved D Completion Once the proper inlet and burner manifold pressures have been confirmed and or properly set close the fuel supply valve to the heater and allow the heater to burn off any gas remaining in the gas supply line Disconnect the heater from its electrical supply Remove the gauges gas hose and tee Install pressure tap plug Reconnect sediment trap and gas hoses Open fuel supply valve Start the heater and check for gas leaks Set thermostat to desired temperature Troubleshooting Instructions READ THIS ENTIRE SECTION BEFORE BEGINNING TO TROUBLESHOOT PROBLEMS AX WARNING This heater can start at any time Troubleshooting this system may require operating the unit with line voltage present and gas on Use extreme caution when working on the heater Failure to follow this warning may result in personal injury or death The following troubleshooting guide provides systematic procedures for isolating equipment problems This guide is intended for use by a QUALIFIED GAS HEATER SERVICE PERSON DO NOT ATTEMPT TO SERVICE THESE HEATERS UNLESS YOU HAVE BEEN PROPERLY TRAINED T
29. eat rate before controller shuts the heater down Do not exceed input rating stamped on nameplate or manufacturer s recommended burner orifice pressure for size orifice s used Make certain that the primary air supply to main burner is open and free of dust dirt and debris for complete proper combustion Shut Down Instructions If the heater is to be shut down for cleaning maintenance or repair follow steps 1 5 Otherwise simply turn thermostat to off or no heat for standard shut down 1 2 Close all manual fuel supply valves With the heater lit allow heater to burn off excess fuel in gas supply hose 3 Turn the indicator on the gas control to off 4 Turn thermostat to off or no heat position 5 Disconnect the heater from the electrical supply Cleaning Instructions WARNING Fire Burn and Explosion Hazard This heater contains electrical and mechanical components in the gas management and safety systems Such components may become inoperative or fail due to dust dirt wear and aging Periodic cleaning and inspection as well as proper maintenance are essential to avoid serious injury or property damage 1 Before cleaning shut off all gas supply valves and disconnect electrical supply At least once a year give the heater a thorough cleaning preferably before the beginning of the fall heating season At that time remove the fan and motor assembly
30. er must be retested by properly qualified service personnel before placing the heater back into use Do not exceed input rating stamped on the dataplate of the heater Do not exceed the burner manifold pressure stated on the dataplate Do not use an orifice size different than specified for the specific input rating of this heater fuel type configuration and altitude AIR DIVERTER INSTALLATION INSTRUCTIONS Optional accessory on some models Appearance of the outlet on heater may vary from model to model FIG 1 Typical installation allowing two directions of air movement NOTCHES IN MOUNTING TABS TABS OUTLET SCREWS FORMED OUTLET GUARD DIVERTER HALVES Alternate Air Diverter Installations INDOOR INSTALLATION INSTRUCTIONS This heater may be mounted within the greenhouse for indoor heating applications The heater may be installed on an optional indoor mounting bracket kit part number 23651 which is installed on freestanding supports or mounted directly to the structure s wall Separate installation instructions accompany the kit The heater may also be suspended by chain to the greenhouse s overhead structure by using an optional chain hanging kit part number 08748 Refer to the following instructions and illustrations 1 Assemble eyebolts and chain according to the illustration and tighten all eyebolts securely See Fig 2 FIG 2 EYEBOLT CHAIN NUT FLAT WASHER CAGE NUT CAS
31. heel from the motor shaft Use a wheel puller if necessary 5 Remove the four 4 nuts securing the motor to the mounting plate AIR PROVING SWITCH 1 Open the motor end access panel and disconnect the air proving switch leads 2 Remove the air proving switch mounting nuts and pull the switch from the fan housing panel 3 The replacement switch includes appropriate quantity of mounting screws and nuts Slide the switch onto the screws and secure into place with the two nuts 4 Reconnect the heater to its electrical supply and open the fuel supply valves to the heater 5 Close and latch the access panel Start the heater and check for proper operation FIG 8 MOTOR MOUNT PLATE NUTS 4 Close the fuel supply valve to the heater and disconnect the heater s electrical supply before servicing unless it is necessary to have the valve open and electrical supply connected for your service procedure For reassembly reverse the respective service procedure Ensure gas connections are tightened securely After servicing start the heater to ensure proper operation and check for gas leaks Clean the heater s burner orifice with compressed air or a soft dry rag Do not use files drills etc to clean the orifice hole Doing so may enlarge the hole causing combustion or ignition problems Replace the orifice if it cannot be cleaned properly NOTES a Fan wheel to motor mount plate spacing must be adjusted to
32. ithin the heater for corrosion frayed or cut insulation tight connections etc Repair or replace as necessary 6 Review all heater markings i e wiring diagram warnings start up shut down troubleshooting etc at the time of maintenance for legibility Make sure none are cut torn or otherwise damaged Any damaged markings must be replaced immediately by contacting the L B White Co Inc Dataplates start up and shut down instructions and warnings are available at no cost A nominal charge will be applied for wiring diagrams Service Instructions GENERAL WARNING Burn Hazard Heater surfaces are hot for a period of time after the heater has been shut down Allow the heater to cool before performing service maintenance or cleaning Failure to follow this warning will result in burns causing injury AX WARNING Fire and Explosion Hazard Do not disassemble or attempt to repair any component part of the heater including regulators and gas hoses All components must be replaced if defects are found Failure to follow this warning will result in gas leaks Gas leaks cause fire or explosions leading to property damage injury or death MOTOR AND FAN WHEEL ASSEMBLY 1 Open the motor end access panel and disconnect the motor leads 2 Remove the motor mounting plate screws and pull the fan and motor assembly from the housing 3 Loosen the square head set screw s on the fan wheel 4 Pull the fan w
33. jury or burns Property damage or loss from fire or explosion Asphyxiation due to lack of adequate air supply or carbon monoxide poisoning Electrical shock Read this Owner s Manual before installing or using this heater Only properly trained service people should repair or install this heater Save this Owner s Manual for future use and reference Owner s Manuals and replacement labels are available at no charge For assistance contact L B White at 800 345 7200 A WARNING Proper gas supply pressure must be provided to the inlet of the heater Refer to dataplate for proper gas supply pressure Gas pressure in excess of the maximum inlet pressure specified at the heater inlet can cause fires or explosions Fires or explosions can lead to serious injury death building damage or plant loss Gas pressure below the minimum inlet pressure specified at the heater inlet may cause improper combustion Improper combustion can lead to asphyxiation or carbon monoxide poisoning and therefore serious injury or death to humans and plant life AX WARNING Fire and Explosion Hazard Keep solid combustibles a safe distance away from the heater Solid combustibles include wood or paper products straw and dust Do not use the heater in spaces which contain or may contain volatile or airborne combustibles Volatile or airborne combustibles include gasoline solvents paint thinner dust particles or unknown chemical
34. may lead to overheating possibly resulting in a fire with subsequent damage to the heater building damage or loss of plants The high limit switch should be tested a minimum of once 1 2 3 per year when the heater is given a thorough cleaning Disconnect the heater from its electrical supply Remove the high limit switch Holding the switch by one of its mounting legs apply a small flame only to the sensing portion on the back of the switch Be careful not to melt the plastic housing of the switch when conducting this test Within a minute you should hear a pop coming from the switch which indicates the contacts of the switch have opened Check for lack of electrical continuity across the switch terminals to verify contacts have opened TESTING THE MANUAL RESET HIGH LIMIT SWITCH 5 Allow the switch cool down for about a minute before firmly pressing the reset button on the switch Check for electrical continuity across the switch terminals to make sure the contacts have closed Reinstall the switch back into the heater Reconnect the heater to its electrical supply Start the heater and check for proper operation FIG 13 RESET BUTTON SENSING SURFACE TERMINAL MOUNTING FLAME LEG ATTENTION The following explains a typical procedure to be followed in checking gas pressures Consult the dataplate on the heater or page 4 in this manual for specific pressures to be used in conju
35. n implied warranty lasts so the above limitation may not apply to you Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state Replacement Parts and Service Contact your local L B White dealer for replacement parts and service or call the L B White Co Inc at 1 800 345 7200 for assistance Be sure that you have your heater model number and configuration number when calling
36. nction with this procedure The gas pressures will vary depending upon fuel type Gas pressure measured at the inlet to the gas valve is Inlet Pressure and gas pressure measured at the outlet of the gas valve is Burner Manifold Pressure MATERIALS REQUIRED To be secured through local purchase Quantity Description 2 Gas pressure gauges capable of reading up to 35 in W C may also be ordered from L B White part number 00764 1 1 2 in Tee 1 Bushing 1 2 in x 1 4 1 Bushing 1 4 in x 1 8 A Preparation 1 Disconnect the heater from the electrical supply and close the fuel supply valve to the heater inlet 2 Remove gas hose and sediment trap from heater 3 Assemble the hardware components together as shown in Fig 14 4 Open the case access panel at gas inlet end of heater 5 Brush or blow off any dust or dirt in the vicinity of the gas control valve B Gauge Installation 1 Locate the outlet pressure tap see Fig 14 Remove the pressure tap plug using a 3 16 in allen key 2 Securely connect a pressure gauge at this pressure tap and at the tee adapter at heater inlet See Fig 14 3 Open the fuel supply valves to the heater reconnect the heater electrical supply and start the heater FIG 14 5 8 NIPPLE 1 2 IN GAUGE 09784 GAUGE 00764 OUTLET_ PRESSURE _ TAP BUSHING 1 4 IN X 1 8 IN BUSHING 1 2 IN X 1 4 IN 5 TEE 1 2 IN
37. o may cause improper combustion or damage to heater components leading to property damage or plant loss The hose assembly shall be visually inspected on an annual basis If it is evident there is excessive abrasion or wear or if the hose is cut it must be replaced prior to the heater being put into operation The hose assembly shall be protected from building materials and contact with hot surfaces during use The hose assembly shall be that specified by the manufacturer See parts list Check for gas leaks and proper function upon heater installation at beginning of heating season or when relocating This heater should be inspected for proper operation by a qualified service person before the start of fall heating season and at least annually Always turn off the gas supply to the heater if the heater is not going to be used This heater is equipped with a three prong grounding plug for your protection against shock hazard and must be plugged directly into a properly grounded three prong receptacle Failure to use a properly grounded receptacle can result in electrical shock personal injury or death Direct ignition heaters will make up to three trials for ignition If ignition is not achieved the control system will lock out the gas control valve If gas is smelled after system lock out has occurred immediately close all fuel supply valves Do not relight until you are sure that all gas that may have accumulated has cleare
38. o the gas valve may cause that valve to malfunction resulting in a serious gas leak that could result in a possible fire or explosion causing loss of products building or even life A properly installed sediment trap will keep foreign materials from entering the gas valve and protect the safe functioning of that important safety component Any heater connected to a piping system must have an accessible approved manual shut off valve installed within six feet 6 ft of the heater it serves Check all connections for gas leaks using approved gas leak detectors Gas leak testing is performed as follows AX WARNING Fire and Explosion Hazard Do not use open flame matches torches candles etc in checking for gas leaks Use only approved leak detectors Failure to follow this warning can lead to fires or explosions Fires or explosions can lead to property damage personal injury or loss of life Check all pipe connections hose connections fittings and adapters upstream of the gas control with approved gas leak detectors In the event a gas leak is detected check the components involved for cleanliness and proper application of pipe compound before further tightening Furthermore tighten the gas connections as necessary to stop the leak After all connections are checked and any leaks are stopped turn on the main burner Stand clear while the main burner ignites to prevent injury caused from hi
39. or installation the heater is to be installed at least 18 inches above the ground or to a height that would prevent snow blockage of heater s air inlet Refer to instructions provided in the optional L B White outdoor mounting and ducting kit part number 23578 4 The heater must have the proper gas regulator installed for the application A regulator must be connected to the gas supply so that gas pressure at the inlet to the gas valve is regulated within the range specified on the dataplate at all times Contact your gas supplier or the L B White Co Inc if you have any questions 10 The heater s gas regulator with pressure relief valve should be installed outside of building Any regulators inside the buildings must be properly vented to the outside Local state and national codes always apply to regulator installation Natural gas regulators with vent limiting device may be mounted indoors without venting to outdoors All gas pressure regulators must be installed in strict accordance with the manufacturer s safety instructions These instructions accompany each regulator Insure that all accessories that ship within the heater have been removed from inside of heater and installed This pertains to air diverters hose regulators etc Make certain that a sediment trap is installed at the gas valve inlet to prevent foreign materials pipe compound pipe chips and scale from entering the gas valve Debris blown int
40. questions about the use of the equipment or its application The L B White Co Inc has a policy of continuous product improvement It reserves the right to change specifications and design without notice SPECIFICATIONS Maximum Input BTUH Minimum Input BTUH Indoor Mounting Air Exchange Requirements 4 Outdoor Mounting Air Exchange Requirements 1 Inlet Gas Supply Pressure Acceptable at the Inlet of the Heater for Purpose of Input Adjustment In W C Burner Manifold Pressure In W C Fuel Consumption Per Hour Motor Characteristics Electrical Supply Volts Hz Phase Amp Draw Dimensions Inches LxWxH Minimum Safe Distances From Nearest Combustible Materials Net Weight Ibs Shipping Weight 105 Heater Specifications EXHAUST FAN SHUTTERED AIR INLET SHUTTERED EXHAUST OUTLET MAX MAX MAX STARTING CONTINUOUS OPERATION TOP SIDES BACK BLOWER OUTLET GAS SUPPLY HD120 Propane Natural Gas Gas 120 000 65 000 300 CFM 120 sq in 120 sq in 13 5 11 0 11 0 7 0 5 2 3 1 1 3 0 8 5 56 lbs 120 cu ft 3 01 Ibs 65 cu ft Ball Bearing 1 3 H P 1 100 RPM 115 60 1 11 8 4 5 30 3 4 x 18 1 4 x 28 1 4 1 ft 1 ft 1 ft 6 ft 1 83 m Propane Gas Supply 6 ft 1 83 m Natural Gas Supply N A 116 126 1 Air inlets and exhaust outlets must be electromechanically operated and electrically interlocked with the heater to preven
41. rter should then have the shape shown in Fig 1 The air diverter s tabs on each half will pop into the blower outlet between the inside of the case assembly and the blower housing outlet If the notched tabs do not pop into the blower outlet loosen do not remove the blower outlet screws Doing this provides a gap into which you can insert the tabs Retighten the screws after installation 14 15 16 17 18 This heater can be configured for use with either L P gas vapor withdrawal or natural gas Consult the dataplate for the gas configuration of the specific heater Do not use the heater in an L P gas liquid withdrawal system or application If you are in doubt contact the L B White Co Inc Eventually like all electrical mechanical devices the thermostat can fail Thermostat failure may result in either an underheating or overheating condition which may damage or kill plants Plants should be protected by a separate back up control system that limits high and low temperatures and also activates appropriate alarms Take time to understand how to operate and maintain the heater by using this Owner s Manual Make sure you know how to shut off the gas supply to the building and also to the individual heater Contact your fuel gas supplier if you have any questions Any defects found in performing any of the service or maintenance procedures must be eliminated and defective parts replaced immediately The heat
42. s Failure to follow these instructions may result in a fire or explosion Fire or explosions can lead to property damage personal injury or loss of life A WARNING Fire and Explosion Hazard Not for home or recreational vehicle use Installation of this heater in a home or recreational vehicle may result in a fire or explosion Fire or explosions can cause property damage or loss of life FOR YOUR SAFETY Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance FOR YOUR SAFETY If you smell gas 1 Open windows 2 Don t touch electrical switches 3 Extinguish any open flame 4 Immediately call your gas supplier Table of Contents SECTION PAGE General aves E dee Meo Ss 3 Heater Specification muii Bee ___ ___ 4 Safety Cesta bab teil e 5 Installation Instructions po eee 7 Air Diverter Installation Instructions 8 Indoor Installation Instructions ccc ete eee eee 9 Sediment Trap Assembly Instructions 2 eee eee 10 Heater Control INStructiOnSs 8 2 53 ate
43. s results in less temperature variation and potentially lower fuel consumption Gas Hose Flexible connector used to convey gas from supply line in building to heater Heat Chamber Metal fire box within the heater that provides an area where burner flame mixes with combustion air thereby providing heat Heater Component Function High Limit Switch Safety device wired into the control system which is used to break an electrical circuit to the gas control valve in event of overheat situation Igniter Ignition device used on automatic direct spark ignition control systems Ignites gas by spark Motor Electric device used to force preheated air through the heater and to circulate heat within a certain area Converts electrical energy into mechanical energy Regulator Mechanical device used in L P and natural gas distribution systems to reduce a higher inlet pressure to a preset lower pressure The regulator is responsible to supply a steady outlet pressure to the heater s despite changes in inlet pressure heater demand and weather conditions Selector Switch Electrical device which is used to allow the end user to use the heater in either a heating or ventilation application Thermostat Optional Accessory A two stage electrical device which responds to more closely match a heat to demand requirement The thermostat incorporates two independent control circuits which interconnect to the heater s two stage gas control
44. s of the date code marked on the part If the defect occurs more than 12 months later than the date code but within 12 months from the date of purchase by the end user a copy of a bill of sale will be required to establish warranty qualification The warranty set forth above is the exclusive warranty provided by L B White and all other warranties including any implied warranties or merchantability or fitness for a particular purpose are expressly disclaimed In the event any implied warranty is not hereby effectively disclaimed due to operation of law such implied warranty is limited in A warranty card on file at L B White will automatically qualify a unit and its component parts for warranty consideration If a warranty card is not on file a copy of the bill of sale will be required to establish warranty qualification If neither is available the warranty period will be 12 months from date of shipment from L B White duration to the duration of the applicable warranty stated above The remedies set forth above are the sole and exclusive remedies available hereunder L B White will not be liable for any incidental or consequential damages directly or indirectly related to the sale handling or use of the equipment and in any event L B White s liability in connection with the equipment including for claims based on negligence or strict liability is limited to the purchase price Some states do not allow limitations on how long a
45. s phone and call your fuel gas supplier and your fire department Do not re enter the building or area Stay out of the building and away from the area until declared safe by the firefighters and your fuel gas supplier FINALLY let the fuel gas service person and the firefighters check for escaped gas Have them air out the building and area before you return Properly trained service people must repair the leak check for further leakages and then relight the appliance for you The odorant in propane LP gas and natural gas is colorless and the intensity of its odor can fade under some circumstances If there is an underground leak the movement of gas through the soil can filter the odorant Propane LP gas odor may differ in intensity at different levels Since propane LP gas is heavier than air there may be more odor at lower levels Always be sensitive to the slightest gas odor If you continue to detect any gas odor no matter how small treat it as a serious leak Immediately go into action as discussed previously ATTENTION CRITICAL POINTS TO REMEMBER Even if you are not properly trained in the service and repair of the heater ALWAYS be consciously aware of the odors of propane LP gas and natural gas A periodic sniff test around the heater or at the heater s joints i e hose connections etc is a good safety practice under any conditions If you smell even a small amount of gas CONTACT YOUR FUEL GAS
46. t heater operation if air inlet and exhaust outlet do not open when heating is required Safety Precautions WARNING Asphyxlation Hazard Do not use this heater for heating human living quarters Do not use in areas without proper air exchange See air exchange requirements on page 4 or on heater s dataplate Exhaust fans supply air inlets or exhaust fan outlets must not be obstructed Proper air exchange must be provided for either indoor or outdoor mount installations Refer to the specification section and installation instructions of the heater s Owner s Manual heater dataplate or contact the L B White Company to determine air exchange requirements of the heater Lack of proper air exchange will lead to improper combustion Improper combustion can lead to carbon monoxide poisoning in humans leading to serious injury or death Symptoms of carbon monoxide poisoning can include headaches dizziness and difficulty in breathing FUEL GAS ODOR LP gas and natural gas have man made odorants added specifically for detection of fuel gas leaks If a gas leak occurs you should be able to smell the fuel gas THAT S YOUR SIGNAL TO GO INTO IMMEDIATE ACTION Do not take any action that could ignite the fuel gas Do not operate any electrical switches Do not pull any power supply or extension cords Do not light matches or any other source of flame Do not use your telephone Get everyone out of the building
47. ts of the switch FAN WHEEL PIVOT POINT OF FLAPPER PIVOT POINT OF FLAPPER a clearance 1 11 41 EDGE FLAPPER OJ IGNITER AND FLAME SENSOR IMPORTANT 1 The igniter and sensor assembly is located within a metal enclosure on the heater chamber 2 Remove the screw that secures the assembly to the heat chamber and disconnect the respective leads from the ignition control Lift the assembly from its mounting slots See Fig 11 FIG 11 TO GAP IGNITER LOOSEN SCREW MOVE ENCLOSURE UP OR DOWN TO ALLOW PROPER POSITIONING OF IGNITER TO BURNER IGNITER TO REMOVE IGNITER SENSOR ASSEMBLY REMOVE SCREW LIFT ASSEMBLY FROM ITS MOUNTING SLOTS ENCLOSURE IGNITER LEAD SENSOR LEAD The assembly may require cleaning due to accumulations of dust and dirt over a period of time thereby affecting its ability to ignite fuel gas and sense burner flame If spark appears be weak briskly rub the igniter electrode with emery cloth or steel wool If the spark appears strong but the heater cycles off briskly rub the sensor rod with emery cloth or steel wool Ensure the igniter gap is 3 16 in and the igniter tip is positioned over the burner slot according to the illustration below WARNING Fire Hazard Do not operate the heater with the high limit switch bypassed Operating the heater with a bypassed high limit switch
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