Home

SERVICE MANUAL

1. Burner Head Spark Plug Ignition Models Service Manual Restricted Fuel Flow cont O utlet A Seal Leak End Remove the rubber seal washer from stem of nozzle and discard To be safe always replace nozzle sleeve dur ing servicing of burner head Even the smallest air leak in this area can reduce flow rates and result in problems Note On smaller heaters 30 000 thru 55 000 BTU in spect O ring do not remove Install a new rubber seal to stem of nozzle Make sure the seal washer spring and second seal washer are in place before reinstalling nozzle in the burner head B Fuel Filter Clogged Clean or replace fuel filter as necessary filter is located at lower end of fuel pickup tube on 30 thru 70 and 200 models Filter is located on top of fuel tank on 100 thru 165 models On 200 model the filter is located at the end of fuel line inside fuel tank C Restriction in Nozzle or Burner Head Using a compressed air source blow the compressed air through the outlet end of nozzle to dislodge any pos sible restriction Nozzle Seal CAUTION NEVER DRILL OUT OR TRY TO INCREASE NOZZLE SIZE Using compressed air also blow through passages in burner head The air should be directed from input fitting at rear of head to the center of burner head Many times the restriction to the flow is due to metal chips etc being present in the burner head assembly Fuel Filter Bushing and Lower Fuel L
2. 15 Spark Plug Ignition Models Service Manual 6 Defective Solid State Relay Defective Solid State Relay Prepare a jumper wire approximately 8 long with a male quick disconnect terminal at one end and a test probe at the other end Disconnect the black wire coming from the motor that is connected to the solid state relay termi nal Connect this black wire to the male connection of jumper wire Touch the test probe to the opposite termi nal of the solid state relay and plug in the heater As soon as the motor reaches speed remove the test probe from terminal The motor should continue to run If the motor operates correctly the solid state relay should be re placed Red Wire Solid State CAUTION DO NOT TOUCH ELECTRICAL CONNEC TIONS OR ALLOW THEM TO TOUCH METAL PARTS OF THE HEATER Black Wire From Motor Low Voltage to Heater In certain circumstance a heater may operate correctly when being tested in the service shop but the customer complains that it does not start at times on the job site It is important that the customer is made aware that if the heater is operated on an incorrectly sized extension cord or a low voltage outlet the heater s motor will not start due to low voltage If the customer has the availability of a voltmeter have the customer check the voltage at the heater A minimum of 108 volts while the heater is run ning is necessary for proper operation Refer to the Elec
3. 10 IL GautiOris uu uuu A ete bn nest 10 III Using The HA1170 Tester 1 Operation 1 cce mette 10 2 Calibration enr d 10 IV Diagnostic Charts 10 Wiring Diagram s 23 GENERAL INFORMATION I ARRANGEMENT OF MANUAL This manual contains information and service procedures to assist the service technician in understanding and correcting problems on DESA International oil fired portable forced air heaters The first section of the manual contains basic infor mation concerning the operation of the different components in the heater This information should be reviewed by service personnel to provide a basic understanding of how the com ponents function in the working system The Troubleshooting section of this manual is intended to provide a quick reference concerning conditions which result in customer complaints These procedures will help the service technician quickly diagnose a malfunctioning heater The illustrations in this manual may not necessarily depict the actual heater model and are intended for reference ONLY I TECHNICAL SERVICE DEPARTMENT The Technical Service Department located in Bowling Green Kentucky is committed to assisting our Authorized Service Centers to increase their service knowledge so that they can provide prompt efficient service This Service Manual covers the majority of problems that are
4. R110B 110 000 5 3 100735 19 0 103493 01 102548 03 104068 02 R110BT HA3027 102001 21 R115 115 000 5 3 100735 19 0 103493 01 102548 03 104068 02 REM115 HA3027 102001 21 RM115 REM150E 150 000 5 4 100735 20 1 103493 01 102548 03 104068 02 HA3028 102001 21 R155B 155 000 5 100735 20 1 103493 01 102548 03 104068 02 REM155B HA3028 102001 21 RM155 R165AT 165 000 5 100735 21 103493 01 102548 03 104068 02 HA3029 102001 21 R200A 200 000 6 2 100735 31 105183 01 102548 03 104068 02 102001 27 M16656 24 Photocell will apply to all models for service Hot Surface Ignition Models Service Manual COMPONENT OPERATION l AIR SYSTEM 1 Air Pump The heater s air pump consists of a rotor with four carbon blades rotating inside a pump body The rotor is driven directly by the motor and is attached to the motor shaft by means of a plastic insert As the motor rotates the carbon blades travel outward rubbing against the inside surface of the steel pump body The rotor s position inside the pump body is such that itis not concentric with the pump body and a 003 004 of an inch gap is set at the uppermost quadrant As the motor rotates the air between the blades is compressed and routed to the nozzle through the air line Gap Adjusting 003 004 PH A Y Clearance Motor Shaft e Measured P 2 with Feeler Insert EC Gage Air Output Air Intake Side Side O Z
5. 080 R200 200 000 100735 13 102001 07 097061 01 105 115 102482 01 Transformer or Electronic Ignitor will apply to all models for service Spark Plug Ignition Models Service Manual COMPONENT OPERATION l AIR SYSTEM 1 Air Pump The heater s air pump consists of a rotor with four carbon blades rotating inside a pump body The rotor is driven directly by the motor and is attached to the motor shaft by means of a plastic insert As the motor rotates the carbon blades travel outward rubbing against the inside surface of the steel pump body The rotor s position inside the pump body is such that itis not concentric with the pump body and a 003 004 of an inch gap is set at the uppermost quadrant As the motor rotates the air between the blades is compressed and routed to the nozzle through the air line Sab Salven 003 004 PH e Y Clearance Motor Shaft e Measured with Feeler Insert d Gage Air Output Air Intake Side Side O Z O O ond Rotor Pump Body Blade Direction of Rotation Clockwise 2 Air Filters The air filtering system consists of an air input filter and an air output filter The air input filter is located at the right rear of the motor and its purpose is to filter all incoming air prior to entering the air pump The filter design is such that it can be cleaned in a mild soapy solution thoroughly dried and used over again The air output filter is located under the plastic end cover Thi
6. Hot Surface Ignition Models Service Manual 2 Ignition Control Photo Cell The ignition control circuit consists of a photocell light sensi tive resistor and an ignition control The photocell is used to sense the presence of light inside the combustion chamber The resistance of the photocell changes as the light level inside the combustion chamber changes When the heater is operating properly the flame pattern inside the combustion chamber is very turbulent which results in the resistance of the photocell increasing and decreasing very rapidly This dy namic change in resistance is required by the ignition control to allow the heater to continue to operate If the signal from the photocell becomes lazy or steady state indicating a lack of turbulence then the heater will be turned off Some examples of this condition are a loss of fan and a blocked inlet Because the photocell also responds to the color of the flame the control will also shut off the heater if the fuel air mixture is too lean With a fuel lean mixture the flame becomes blue in color and the photocell does not respond to that end of the light spectrum as well as it responds to orange light which is present during proper operation As a service technician itis important to understand the operation of the ignition control In the past it has been the single most misdiagnosed part of the heater It is suggested that all controls be checked per instructions listed in t
7. trical Section of this manual page 5 for proper exten sion cord sizing 16 OBSERVED FAULT Wires on Cord AC Source TEST PROCEDURE O Check That Reset Button on Safety Control is Fully Depressed Visually inspect the black reset button on safety control The button must be fully depressed and latched in for Reset Button operation 2 Check Wiring Connections at Safety Control and Wire Nuts for Proper Fit Wire Nuts Possible Causes External to Heater Check for Broken or Frayed If External Thermostat is Used Plug Heater directly to Spark Plug Ignition Models Service Manual Heater Does Not Start Motor and Transformer Ignitor Does Not Operate Possible Causes Internal to Heater Check That Reset Button on Safety Control is Fully Depressed Check Wiring Connections at Safety Control and Wire Nuts for Proper Fit Check for Continuity of Circuit Breaker Physically check electrical connections at wire nuts and safety control for proper fit Check for continuity between male prongs of power cord to safety control Terminal Board Make sure connections are secure 17 Spark Plug Ignition Models Service Manual 3 Check for Continuity of Circuit Breaker A Standard Safety Control 098205 04 With the heater disconnected from AC source discon nect the red and black wires connected to the safety con trol Push reset button in With t
8. Fuel Lifted From Tank by Negative Pressure I ELECTRICAL SYSTEM 1 Motors The motors used on the low pressure heaters are fractional horsepower motors ranging from 1 15 HP on the smallest heater to 1 4 HP on the largest heaters The motors used can be grouped into two categories The first category is the shaded pole motor The shaded pole motor contains a single winding and does not require an external start relay for operation These motors are easily identified by observing that only two wires usually red and white are necessary for operation The second category is the split phase motor This motor contains two separate windings The first winding being the auxiliary or start winding and the second being the main or run winding This motor requires and external means of switching the power off to the auxiliary winding after the motor reaches a predetermined speed This power off switching is accom plished by a motor start relay or solid state relay These motors are identified by observing that three wires black red and white are routed from the motor AC LINE Shaded Pole Motor CAPACITOR AC LINE Split Phase Motor Spark Plug Ignition Models Service Manual 2 Solid State Relay Applicable models use 097061 01 Solid State Relay The solid state relay is used to de energize the start winding on split ohase motors As mentioned in the Motor Section remember that split phase motors have both an auxiliary start an
9. Heater COCO OOo TEST PROCEDURE Broken Rotor or Blades Disassemble the end cover filter and end pump cover from rear of motor Visually inspect the rotor and blades for breakage Make sure that the rotor and blades are free of any type of lubricant Rotor and blades must be clean and dry for proper operation 2 Improper Rotor Clearance Check rotor with feeler gauge for proper clearance 003 004 between rotor and pump body Rotate ro tor and make sure all four quadrants of rotor have ad equate clearance 3 Oversized Rotor If the fan is hard to turn when the motor end cover is Sandpaper installed but easy to turn when loosened the rotor should be removed and lightly sanded Remove the rotor and lightly sand by placing rotor in the palm of hand and sand ing on a flat surface making figure eight rotations Use the finest grade of sandpaper available Pump Body 14 Hot Surface Ignition Models Service Manual Dry Motor Bearing If the fan is difficult to turn with air pump parts removed then motor bearings are defective Bearings are perma nently lubricated therefore motor should be replaced Open Motor Windings Disconnect motor wires red and white from ignition con trol assembly Attach the ohmmeter leads to the moter wire terminals Using the 0 to 200 OHM scale measure the resistance of the motor windings Refer to the chart below for resistances for each model If the re
10. O O ond Rotor Pump Body Blade Direction of Rotation Clockwise 2 Air Filters The air filtering system consists of an air input filter and an air output filter The air input filter is located at the right rear of the motor and its purpose is to filter all incoming air prior to entering the air pump The filter design is such that it can be cleaned in a mild soapy solution thoroughly dried and used over again The air output filter is located under the plastic end cover This filter s purpose is to prevent any carbon dust from rotor or blade wear from entering the air passages in the nozzle This filter is non cleanable and should be replaced when considerable buildup of carbon dust is observed See drawings below Air Output Filter Air Output Filter Air Input Filter Air Input 35 000 50 000 55 000 and 70 000 BTU Filter System 110 000 115 000 150 000 155 000 165 000 and 200 000 BTU Filter System 3 Nozzle As mentioned previously the purpose of the air pump is to compress air and deliver it to the nozzle The compressed air as it travels through the nozzle creates a negative pressure that extends back through the center of the nozzle This negative pressure lifts the fuel from the fuel tank The fuel from the fuel tank and the compressed air are mixed at the nozzle which results in a very fine mist of fuel being sprayed into the combustion chamber The air pump nozzle combination elimi nates the need fo
11. The user should be aware of the proper size heater needed for a particular application It is easy to see that a 30 000 BTU heater would not heat a large warehouse but the question is sometimes asked What size heater should use A simple formula that can be used to determine heater BTU require ments follows Cu Ft of Area X 133 X Desired Temp Rise F BTU Size Needed Example Area 50 X 25 X 10 12 500 Cu Ft Desired Temp Rise 30 F 12 500 Cu Ft X 133 Factor 1662 5 X30 Temp Rise 49 875 Proper Heater Size ANSWER A 50 000 BTU heater should be selected for this application I HEATER PERFORMANCE SPECIFICATIONS SPARK PLUG MODELS Reddy Heater Brand Technical Service Heater Performance Data Heater Model Motor Motor Start Fuel AMPS Spark Plug Horsepower Relay or Tank Running Gap Solid State Capacity inches Relay Gal R30 M29681 102001 01 Not Used 050 060 R35 R35A 35 000 100735 02 102001 01 Not Used 3 050 060 R35B R50 R50A 50 000 2 M50597 102001 01 Not Used 050 060 R50B R55 55 000 100735 17 102001 01 Not Used 050 060 R70 R70A 70 000 100235 04 097308 02 M25061 1 I 050 060 R70B R70BT R100 R100A 100 000 100735 06 097300 02 097061 01 070 080 R110 110 000 s 100735 06 097300 02 097061 01 070 080 R150B R150D 150 000 i 100735 07 097300 02 099061 01 070 080 R165 165 000 100735 10 102001 07 097061 01 070
12. in heater Never attach duct work to front or rear of heater Approved by the New York City Fire Department under certificate of approval 4803 4860 4908 or 4909 To be used only at construction sites in accordance with applicable New York City Codes Regulations Rules Directives Permits etc Warning to New York City Residents For Use Only At Construction Sites in accordance with applicable NYC codes under NYCFD certificate of approval 4803 4899 4908 4909 or 4934 Spark Plug Ignition Models Service Manual TABLE OF CONTENTS General Information Arrangement of Manual 3 Il Technical Service Department 3 Ill Service Preparation 3 IV Tools Required u 4 R a i ET E EEE EE A 4 Specifications General Specifications 1 Fuel Selection 5 2 Electrical eris 5 3 Ventilation esses 5 4 Heater SIZING irsinin ranea tete 6 Heater Performance Specifications 6 Component Operation l Air System T Air Pumps e a 7 2 AIF FIIGTS sci E ehe eiae 7 By Noz2lo ua ssu e tte eg Pr 7 ll Electrical System T MOItOIS iter eie 7 2 Solid State Relay 8 3 Safety Control Photocell 8 4 Electroni
13. in the vicinity of tarpaulins canvas or simi lar enclosure materials shall be located a safe distance from such materials The recommended minimum safe distance is 10 feet It is further recommended that these enclosure materials be of a fire retardant nature These enclosure materials shall be securely fastened to pre vent them from igniting or from upsetting the heater due to wind action Use only in well vented areas Before using heater pro vide at least a three square foot opening of fresh outside air for each 100 000 Btu Hr of rating This heater produces carbon monoxide which is listed by the State of California as a reproductive toxin under Proposition 65 Use only in places free of flammable vapors or high dust content Use only the electrical voltage and frequency specified on model plate Use only a three prong grounded extension cord Minimum heater clearances from combustibles Outlet 8 Ft Sides 4 Ft Top 4 Ft Rear 4 Ft Locate heater on a stable and level surface if heater is hot or running or a fire may occur When moving or storing heater keep heater in a level position or fuel spillage may occur Keep children and animals away from heater Unplug heater when not in use When used with thermostat heater may start anytime Never use heater in living or sleeping areas Never block air inlet rear or air outlet front of heater Never move handle refuel or service a hot operating or plugged
14. on page 23 Fuse Checking Fuse 2 Blown Fuse on Ignition Control Assembly Remove fuse cover and inspect fuse Check for continu ity with an ohmmeter If fuse is open replace with a fuse of the same type and rating GMA 10 G Defective Ignition Control Assembly With motor and ignitor wires disconnected connect volt meter leads to the ignitor terminals Use the 0 to 200 V A C scale on the voltmeter Apply power 120V 60Hz to the control The meter should read 120 volts for ten seconds and then drop to 0 volts Remove power to con trol Connect meter leads to the motor terminals Apply Meter Leads 17 Hot Surface Ignition Models Service Manual OBSERVED FAULT Ignitor Heats Up Motor Starts and Runs and Fuel Ignites But Heater Shuts Off After a Short Period of Time Ignition Control Trips out Within the First Ten Seconds of Operation Defective Ignition Control 4 Photocell Boot Not Properly Seated in Bracket Safety Control Trips out After Ten Seconds of Operation Defective or Dirty Photocell Check for proper Pump Pressure Bad Electrical Connection s or Wired Incorrectly OO Dirty Clogged Filters in Compressor Check for Restricted Fuel Flow Due to A Seal Leak B Filter Blocked C Restriction in Nozzle or Nozzle Adapter Fuel Cap and Gasket Not Vented 988 TEST PROCEDURE m Defective Ignition control Remove pressure gauge plug
15. test procedure Observed Fault Index Motor starts Unit does not ignite 11 Motor does not run or runs at slow speeds Spark is observed at plug 14 Heater does not start motor and transformer does not operate 17 Heater ignites and burns However Safety control trips and heater shuts off 19 Frequent plug fouling delayed ignition 10 Spark Plug Ignition Models Service Manual OBSERVED FAULT Motor Starts Unit Does Not Ignite Check for Spark at Plug No Spark Observed Check Spark Plug for 2 Spark is Observed Check for Proper Pump Pressure Proper Gap G Check for Restricted Fuel Flow Defective Transformer or Due to Electronic Ignitor A Seal leak B Filter Blocked C Restriction in Nozzle of Burner Head O O Cracked Spark Plug Fuel Filter Restriction Bend Here to Adjust Gap TEST PROCEDURE O Check Spark Plug for Proper Gap See Heater Performance Specifications Spark Plug Gap page 6 for proper gap Reset gap with feeler gauge 2 Defective Transformer or Electronic Ignitor Connect the transformer or electronic ignitor to a prop erly gapped spark plug Establish a good ground between the spark plug and h
16. the fuel delivery system to operate correctly Hot Surface Ignition Models Service Manual OBSERVED FAULT Delayed Igniton 2 Contaminated or Old Fuel TEST PROCEDURE O Wrong Fuel Refer to Fuel Selection on page 5 of this manual 2 Contaminated or Old Fuel Fuel may not be fresh or may be contaminated with wa ter or other foreign liquids Drain fuel tank and rinse with clean fresh kerosene or No 1 fuel oil Refer to local city or county ordinances for proper disposal of fuel oil 22 Hot Surface Ignition Models Service Manual WIRING DIAGRAMS AC Neutral L2 Photocell Photocell Motor Return Power Plug Ignitor L 120V 60Hz Motor Ignition Control Assembly 102350 01 104068 01 Kit AC Hot L1 Ignitor Photocell Photocell Ignitor Power Plug Motor Return 120V 60Hz AC Neutral L2 120V L1 Ignition Control Assembly 104040 01 02 104068 02 03 Kit Yellow 01 Gray 02 35 000 40 000 50 000 55 000 60 000 70 000 110 000 115 000 150 000 155 000 165 000 BTU Models Photocell Photocell Ignitor Motor Return AC Neutral L2 120V 60Hz Ignition Control Assembly Black 104040 01 104068 02 Kit Power Plug AC Hot L1 Motor Ignitor Ignitor If Equipped With Built In Thermostat 200 000 BTU Model 23 ATTENTION Earth ground must be connected to ensure operator safe
17. Assembly TEST PROCEDURE O Check Ignitor Disconnect ignitor wires from ignition control assembly Measure the resistance of the ignitor at the terminals with an ohmmeter use 0 200 OHM scale Ignitor resistance should measure 30 to 175 OHMS If resistance measures outside of this range then ignitor is defective and should be replaced 2 Check Ignition Control Assembly Remove fuse cover and check fuse 70 000 to 200 000 Btu models only If fuse is blown replace it with a GMA 10 fuse Disconnect motor red and white wires from con trol With Ignitor wires disconnected attach voltmeter leads to the ignitor terminals labeled IGNITOR Use the 0 to 200 V A C scale Plug power cord into a grounded 120V 60 Hz outlet Meter should read 120V rms for ap Ignition Control proximately 10 seconds If voltage reads 0 or stays at 120 for more than 10 seconds the control is defective and should be replaced A WARNING High Voltage 11 3 Check for Proper Pump Pressure Install HA1180 Pressure Gauge or equivalent to rear of air filter housing Start heater and adjust air pressure to specified pressure Turn adjustment screw clockwise to increase pressure and counterclockwise to de crease pump pressure The screwdriver must be removed from the slot after any adjustment before taking a read ing on the gauge See Heater Performance Specifica tion on page 6 for specified pressures Note Pressure gauge must be s
18. E Plug White ph Green 1509 ale a White 60HZ p nie e 30 000 35 000 50 000 amp 55 000 BTU Heaters E B WHITE WHITE ET SAFETY E CONTROL g PHOTOCELL WHITE N MOTOR IGNITOR SEHE WHITE BLUE BLACK GREEN RED POWER PLUG RED SOLID GREEN STATE RELAY _ 120 V 60 HZ SPARK PLUG BLACK RED RED 70 000 200 000 BTU Heaters Heaters Equipped With Solid State Relay I MOTOR RESISTANCE CHART OHMS RED TO WHITE BLACK TO WHITE MOTOR MAIN 7 AUXILIARY 7 100088 01 6 2 097130 02 7 5 16 5 097134 02 3 5 18 3 101898 01 2 8 9 1 23 DESA INTERNATIONAL Technical Service Department P O Box 90004 2701 Industrial Drive Bowling Green Kentucky 42102 www desatech com 079337 01 079337 01 NOT A U PC Rev D 08 00
19. SECTION A SERVICE MANUAL LOW PRESSURE PORTABLE FORCED AIR HEATER HOT SURFACE IGNITION MODELS Hot Surface Ignition Models Service Manual SAFETY INFORMATION AX warnines IMPORTANT Read this owner s manual carefully and completely before trying to assemble operate or ser vice this heater Improper use of this heater can cause serious injury or death from burns fire explosion electrical shock and carbon monoxide poisoning A DANGER Carbon monoxide poisoning may lead to death Carbon Monoxide Poisoning Early signs of carbon monoxide poisoning resemble the flu with headaches dizziness and or nausea If you have these signs the heater may not be working properly Get fresh air at once Have heater ser viced Some people are more affected by carbon monoxide than others These include pregnant women persons with heart or lung disease or anemia those under the influence of alcohol and those at high altitudes Make certain you read and understand all warnings Keep this manual for reference It is your guide to safe and proper operation of this heater Use only kerosene or No 1 fuel oil to avoid risk of fire or explosion Never use gasoline naphtha paint thinners alcohol or other highly flammable fuels Fueling a Personnel involved with fueling shall be qualified and thoroughly familiar with the manufacturer s instructions and applicable federal sta
20. amber and is ejected as a jet of clean heated air K The ignition system consists of an electronic ignitor E and spark plug M The electronic ignitor increases the input voltage to a very high potential which causes and arc to jump between the electrodes of the spark plug The arc is used to ignite the fuel and air mixture within the combustion chamber The arc fires constantly during operation In the safety circuit the flame sensor detects the presence of light from the flame inside the combustion chamber Z R 1 f lt T E X i e amp N N q 7 i Ga 47m A i T f lt lt Air For Fuel System dum Air For Combustion im Fuel Spark Plug Ignition Models Service Manual TROUBLESHOOTING I SAFETY REQUIREMENTS This service manual is intended for use by individuals with an adequate knowledge of electrical and mechanical skills At tempts to repair this heater by individuals without those skills can result in personal injury as well as property damage Il CAUTIONS 1 Before servicing disconnect the heater from the electri cal power source by removing the electrical plug from the wall receptacle Note When certain tests require electrical power to be applied connect electrical power only for the time nec essary to
21. an reduce flow rates and result in problems Note On smaller heaters 30 000 35 000 50 000 and 55 000 BTU inspect O ring do not remove ed Nozzle Seal Install a new rubber seal to stem of nozzle Make sure the seal washer spring and second seal washer are in place before reinstalling nozzle in the burner head 12 Spark Plug Ignition Models Service Manual B Filter Blocked On certain models a drop in fuel filter is located in the copper or aluminum line that attaches to the fuel fitting on the back side of the burner head Lift the filter out of the copper or aluminum fuel line and clean if necessary C Restriction in Nozzle or Burner Head Using a compressed air source blow the compressed air through the outlet end of nozzle to dislodge any possible restriction CAUTION NEVER DRILL OUT OR TRY TO INCREASE NOZZLE SIZE Using compressed air also blow through passages in burner head The air should be directed form input fitting at rear of head to the center of burner head Many times the restriction to the flow is due to metal chips etc being present in the burner head assembly 6 Fuel Filter Restriction 13 The fuel filter should be inspected and cleaned The fil ters are located in the fuel line either at tank location in the copper or aluminum tubing or in line with the fuel line at access cover Fuel Filter Bushing and Lower Fuel Line b Note Fuel Filter Location May Vary A
22. associated with the heaters However as with any product certain problems can arise which have not been covered If such problems arise please call the Technical Service Department s number 1 800 323 5190 or visit our website at www desatech com to address these tech nical problem areas If you need assistance for ordering parts billing questions etc you should contact 1 800 432 5212 II SERVICE PREPARATION A clean work area at the start of each job is essential for efficient service work Heaters which are extremely dirty should be cleaned prior to service Cleaning will occasionally uncover the problem area Tools needed for the job should be obtained before workis started Delays resulting from locating tools result in lost time and wages Clean fuel should always be used whentesting heaters Many problems are often traced to the use of the wrong type of fuel or dirty fuel Use caution and common sense when working on a heater Always remember that kerosene is flammable and electrical parts can result in potential shock Heater parts are hot during operation which could result in burns Hot Surface Ignition Models Service Manual IV TOOLS REQUIRED In addition to common hand tools the service shop should have the following tools and instruments for proper repairing of the heaters These instruments will be referred to through V PARTS In addition to the standard parts we now offer parts kits Listed below are the
23. ats a metal bar causing the bar to warp bimetal The warpage releases the spring loaded reset button which breaks all power to the heater As a service technician it is important to understand the operation of the safety control In the past it has been the single most misdiagnosed part of the heater It is suggested that all controls be checked per instructions listed in the Trouble shooting Section prior to replacement Flameout Safety SOA Enclosed Design z Photocell Spark Plug Ignition Models Service Manual 4 Electronic Ignitor All models use 102482 01 Electronic Ignitor Kit The electronic ignitor operates on 120V 60Hz It delivers approximately 6 000 volts average to the spark plug causing the kerosene sprayed from the nozzle assembly to ignite The ignitor operates on a pulse basis The ignitor has no internal service parts and must be replaced when found defective Note It is important for the service technician to be cautious when working with the electronic ignitor due to its high voltage output II FUEL SYSTEM Fuel filters There are several types of fuel filters used on different model heaters The filters are always located in line with the fuel pickup tube The purpose of the filter is to eliminate the possibility of dirt dust etc from entering the nozzle and restricting the flow The filters should be inspected and cleaned whenever a heater is brought in for service It is also important that the bott
24. c Ignitor 9 Ill Fuel System ua aaa aaa aaa a 9 IV Combustion System 9 V All Systems Working Together 9 Troubleshooting l Safety Requirements 10 Il Caton scam ati crac w 10 III Using the Ohmmeter 1 Setting Up the Ohmmeter 10 2 Calibration eeeeeae aaa aaa aaa iaie 10 IV Diagnostic Charts 10 Diagrams and Charts l Wiring Diagrams 23 Il Motor Resistance Chart 23 GENERAL INFORMATION I ARRANGEMENT OF MANUAL This manual contains information and service procedures to assist the service technician in understanding and correcting problems on DESA International oil fired portable forced air heaters The first section of the manual contains basic infor mation concerning the operation of the different components in the heater This information should be reviewed by service personnel to provide a basic understanding of how the com ponents function in the working system Section four of this manual is intended to provide a quick reference concerning conditions which result in customer complaints These proce dures will help the service technician quickly diagnose a malfunctioning heater The illustrations in this manual may not n
25. caled in 1 4 pound in crements for accurate measurement Hot Surface Ignition Models Service Manual 4 Check for Restricted Fuel Flow 35 000 to 165 000 Btu Models Remove air and fuel lines from nozzle adapter Remove nozzle adapter nozzle from bracket 200 000 Btu Model Remove ignitor do not strike or bend element from bracket Place in a safe location Remove air and fuel lines from nozzle adapter Remove two bracket screws and remove bracket nozzle adapter and nozzle assembly from combustion chamber Using a 5 8 socket wrench carefully remove the nozzle from nozzle adapter Be extremely careful not to scratch or score the face of the nozzle A Seal Leak Inspect nozzle seal or o ring for damage Replace if nec essary Combustion Chamber _ Nozzle Adapter Assembly Nozzle Face Nozzle 2 Nozzle hc Nozzle Adapter Air Line __ Fuel Line Fitting Fitting 35 000 165 000 Btu Models Nozzle Face Nozzle Seal Nozzle Nozzle Adapter 12 ET Nozzle Adapter Air Line Bracket Fitting Fuel Line Fitting 200 000 Btu Models Hot Surface Ignition Models Service Manual B Restriction in Nozzle or Nozzle Adapter Using a compressed air source blow the compressed air through the outlet end of nozzle to dislodge any for eign debris CAUTION NEVER DRILL OUT OR TRY TO INCREASE NOZZLE SIZE Also blow compressed air through the nozzle adapter in the direction shown to dislo
26. ccording To Model Spark Plug Ignition Models Service Manual OBSERVED FAULT Motor Does Not Run or Runs at Slow Speeds Spark is Observed at Plug Rotate Fan by Hand to Determine if Fan Rotates Easily Fan is Difficult to Rotate Fan Rotates Easily by Hand O Broken Rotor or Blades 5 Open Motor Winding 2 Improper Rotor Clearance 6 Defective Solid State Relay 3 Oversized Rotor 7 Low Voltage to Heater Dry Motor Bearing TEST PROCEDURE m Broken Rotor or Blades Disassemble the end cover filter and end pump cover from rear of motor Visually inspect the rotor and blades for breakage Make sure that the rotor and blades are free of any type of lubricant Rotor and blades must be clean and dry for proper operation 2 Improper Rotor Clearance Check rotor with feeler gauge for proper clearance be tween rotor and pump body Rotate rotor and make sure all four quadrants of rotor have adequate clearance 14 Spark Plug Ignition Models Service Manual 3 Oversized Rotor If the fan is hard to turn when the motor end cover is installed but easy to turn when loosened the rotor should be removed and lightly sanded Remove the rotor and lightly sand by placing rotor in the palm of hand and sand ing on a flat surface making figure eight rotations Use the finest grade of sandpaper available Oil fan end motor 4 Dry Motor Bearing bearing here If the fan is difficult to turn with air pu
27. cifications for trouble free opera tion is the use of a clean acceptable fuel Listed below are guidelines and comments concerning operation of heaters with different fuels RECOMMENDED COMMENTS FUELS Kerosene Bestoverall results Minimum odor and Fuel Oil No 1 minimum maintenance No additives Jet A necessary for cold weather operation ALTERNATE FUELS COMMENTS Fuel Oil No 2 Noticeable increase in odor Requires Diesel No 1 frequent maintenance of fuel filter Diesel No 2 and nozzle Requires a winterizing additive at temperatures below 20 F 2 Electrical The heater must be connected to a standard electrical outlet 120V 60HZ For safety all heaters are equipped with athree prong power cord which must be grounded When selecting an extension cord for heater usage the following chart should be used in determining wire size LENGTH OF CORD WIRE SIZE AWG 100 Ft No 14 200 Ft No 12 300 Ft No 10 400 Ft No 8 No 6 3 Ventilation The heater should be used only in well ventilated areas Asa rule the following minimum requirements should be followed HEATER SIZE BTU SQUARE FOOT OPENING 35 000 40 000 1 0 Sq Ft 50 000 55 000 60 000 1 6 Sq Ft 70 000 2 1 Sq Ft 110 000 115 000 3 2 Sq Ft 150 000 155 000 4 5 Sq Ft 165 000 5 0 Sq Ft 200 000 6 0 Sq Ft The above is based on ventilation requirements of at least a 3 sq ft opening per 100 000 BTU If possible it is better to p
28. complete the test 2 Do not bypass safety devices 3 If replacement parts are necessary do not substitute with non factory parts use only factory authorized replace ment parts 4 Make sure all electrical connections are secure and all harness leads are in place prior to connection to electri cal power source Ill USING THE OHMMETER Continuity Check Throughout the diagnostic procedures you will be required to check continuity of the electrical circuits A brief description of how to set up the ohmmeter for these tests follows 1 Setting Up the Ohmmeter A use a small screwdriver to adjust the plastic screw on the zero 0 mark to the far left of the scale B With the battery installed set the switch to the RX1 position C Plug in test wires and use insulated alligator clips Screw Typical Ohmmeter 2 Calibration A Zero meter connect the alligator clips to each other The meter pointer should move to far right of ohms scale see Figure B B Usethe OHM thumb adjustment knob to set the pointer at the 0 mark on the scale If pointer will not zero replace battery Note If you are using a digital readout ohmmeter cali brate according to manufacturer s instructions Thumb Adjustment Range Switch IV DIAGNOSTIC CHARTS The following pages contain various diagnostic charts To use the charts find the Observed Fault that exists and follow
29. d a main run winding For proper motor operation both the auxiliary and main winding are energized during start up After the motor starts and reaches approximately 80 of rated speed the auxiliary winding must be de energized to prevent overheating This is accomplished by the use of a solid state relay The operation of the relay functions as a positive temperature coefficient resistor When voltage is applied to the motor the main and auxiliary windings are energized as current flows through the solid state relay which is connected in series with the auxiliary winding only The resistance is increased over time in the solid state relay where it eventually rises to the point that theoretically no current flows de energizing the auxiliary winding Solid State Relay 3 Safety Control Photocell The safety control circuit consists of a photocell light sensitive cell and a safety control The photocell is used to sense the presence of light inside the combustion chamber The photo cell varies its electrical resistance in relation to the light rays which contact its surface When the heater is operating properly the photocell sees sufficient and proper color light which keeps its resistance low When the photocell does not sense the proper color or amount of light the resistance of the photocell increases and forces an electrical current to flow through the solid state trigger circuit The current flows into the circuit breaker and he
30. d replace air intake air output and lint filter if necessary Filters should be replaced after 500 hours of operation Blade Pump Plate Air Intake Filter Filter End Cover Air Output Filter Fan Guard Hot Surface Ignition Models Service Manual 7 Check for Restricted Fuel Flow 35 000 to 165 000 Btu Models Remove air and fuel lines from nozzle adapter Remove nozzle adapter nozzle from bracket 200 000 Btu Model Remove ignitor do not strike or bend element from bracket Place in a safe location Remove air and fuel lines from nozzle adapter Remove two bracket screws and remove bracket nozzle adapter and nozzle assembly from combustion chamber Using a 5 8 socket wrench carefully remove the nozzle from nozzle adapter Be extremely careful not to scratch or score the face of the nozzle A Seal Leak Inspect nozzle seal or o ring for damage Replace if nec essary Combustion Nozzle Chamber _ Adapter Assembly Nozzle Face Nozzle yao Nozzle EE Nozzle Adapter Air Line __ Fuel Line Fitting Fitting 35 000 165 000 Btu Models Nozzle Face Nozzle Seal Nozzle Nozzle RA Adapter Nozzle Adapter Air Line Bracket Fitting Fuel Line Fiting 200 000 Btu Models 21 Fuel Cap and Gasket Not Vented Remove fuel cap and inspect the vent hole and gasket to make sure the passage is open Verify that only one gasket has been installed The fuel tank must be vented properly for
31. del Btu Models Btu Models Hot Surface Ignition Models Service Manual IV COMBUSTION SYSTEM Air being blown by the fan is directed by the air deflectors into the combustion chamber through the two louvers and center opening in the rear head which is riveted to the back of the combustion chamber The nozzle and nozzle adapter are mounted in the burner strap which is fastened to the rear head As the atomized fuel exits the nozzle and is ignited it mixes with the air entering through the rear head The combustion process is completed inside the combustion chamber and the hot air exits the outlet end of the chamber A lt L x EN Air Deflector mu Tl D 5 V ALL SYSTEMS WORKING TOGETHER There are four basic systems within the heater the fuel system the air system the electrical system and the com bustion system An air pump A on one end of the motor shaft forces air through the air line G and out the nozzle l The moving air creates a pressure differential in the nozzle adapter N causing fuel to be drawn from the tank J The fuel air mixture is sprayed into the combustion chamber L in a fine mist Additional air is supplied to the combustion chamber by a fan O to enter the combustion chamber where it mixes with the air and fuel from the nozzle The remaining air is directed around and over the combustion chamber This air mixes with the heated air from the combustion chamber and is ejected as a jet o
32. dge any foreign debris Blowing Compressed Air Through Nozzle 35 000 165 000 Btu Models Blowing Compressed Air Through Nozzle Adapter C Defective Solenoid Valve 200 000 Btu model only Remove upper and lower fuel lines from fittings on sole noid valve Apply 120V 60 Hz power to valve Shine a flash light at one side of valve Light should be visible from the other side when the solenoid is energized If not the valve is obstructed or defective Clean or replace as necessary G Fuel Filter Restriction The fuel filter should be inspected and cleaned see sec tion Ill Fuel System Fuel Filters page 8 After remov ing filter flush with clean kerosene in the reverse direc tion of the fuel flow Fuel Filter Bushing and Lower Fuel Line s Note Fuel Filter Location May Vary According To Model Refer to Fuel System page 8 Fuel Flow Direction Flush In This 8 Direction 100 000 165 000 Btu Models Shown 13 Hot Surface Ignition Models Service Manual OBSERVED FAULT Ignitor Element Heats Up But Motor Does Not Start Within Five Seconds Rotate Fan by Hand to Determine if Fan Rotates Easily Fan is Difficult to Rotate Fan Rotates Easily by Hand Broken Rotor or Blades Open Motor Winding Improper Rotor Clearance Defective Ignition Control Assembly Oversized Rotor Defective Start Run Capacitor Dry Motor Bearing Improper Voltage to
33. e battery and termi nals With the battery connected and the switch in the ON position LED on continuous measure the D C voltage across the battery terminals If this voltage reads 7 5 volts or higher proceed with testing If the voltage reads lower than 7 5 volts replace the battery and confirm the full load voltage Battery Cover Battery Battery Terminals IV DIAGNOSTIC CHARTS The following pages contain various diagnostic charts To use the charts find the Observed Fault that exists and followtest procedure Observed Fault Index Motor starts and runs but fuel does not ignite 11 Ignitor element heats up but motor does not start within TIVE seconds endrerit tein e Ret 14 Ignitor does not heat up and motor does not start within five SECONJS fee 17 Ignitor heats up motor starts and runs and fuel ignites but heater shuts off after a short period of time 18 Delayed Ignition u u 22 10 Hot Surface Ignition Models Service Manual OBSERVED FAULT Motor Starts and Runs but Fuel Does Not Ignite Does Ignitor Element Heat Up L WARNING High Voltage Check for Defective Ignitor Check for Proper Pump Pressure Check for Restricted Fuel Flow Due to A Seal leak B Restriction in Nozzle or Nozzle Adapter C Defective Solenoid Valve 200 000 Btu Models Only Fuel Filter Restriction Defective Ignition Control
34. eater Plug in the heater cord and observe for spark between electrodes If the ground is good and a spark does not jump the gap the transformer or ignitor is defective CAUTION DO NOT LET ANY PORTION OF YOUR BODY TOUCH ELECTRODES OR PLUG DUE TO HIGH VOLTAGE 3 Cracked Spark Plug During the above test if spark is observed at any portion of the plug except at the electrodes the porcelain insu lator is cracked and the plug must be replaced 11 Spark Plug Ignition Models Service Manual Check for Proper Pump Pressure Install HA1180 Pressure Gauge or equivalent to rear of air filter housing Start heater and adjust air pressure to specified pressure Turning adjustment screw clockwise increases pressure counterclockwise decreases pres sure The screwdriver must be removed from the slot after any adjustment before taking a reading on the gauge see Heater Performance Specifications on page 6 for specified pressures Note Pressure gauge must be scaled in 1 4 pound in crements for accurate measurement Check for Restricted Fuel Flow Remove the burner head from heater Using a socket wrench carefully remove the nozzle from burner head Be extremely careful not to scratch or score the face of the nozzle A Seal Leak Remove the rubber seal washer from stem of nozzle and discard To be safe always replace nozzle sleeve during servicing of burner head Even the smallest air leak in this area c
35. ecessarily depict the actual heater model and are intended for reference ONLY ll TECHNICAL SERVICE DEPARTMENT The Technical Service Department located in Bowling Green Kentucky is committed to assisting our Authorized Service Centers to increase their service knowledge so that they can provide prompt efficient service This Service Manual covers the majority of problems that are associated with the heaters However as with any product certain problems can arise which have not been covered If such problems arise please call the Technical Service Department s number 1 800 323 5190 to address these technical problem areas If you need assistance for ordering parts billing questions etc you should contact 1 800 432 5212 lll SERVICE PREPARATION A clean work area at the start of each job is essential for efficient service work Heaters which are extremely dirty should be cleaned prior to service Cleaning will occasionally uncover the problem area Tools needed for the job should be obtained before workis started Delays resulting from locating tools result in lost time and wages Clean fuel should always be used whentesting heaters Many problems are often traced to the use of the wrong type of fuel or dirty fuel Use caution and common sense when working on a heater Always remember that kerosene is flammable electrical parts can result in the potential shock and the heater parts are hot during operation which could res
36. f clean heated air K The ignition system consists of an ignition control assembly E and hot surface ignitor M The ignition control assembly applies 120 volt power to the hot surface ignitor for 10 seconds which consists of a 5 second preheat period and a 3 to 4 second ignition trial period The extremely high temperature of the ignitor element ignites the fuel and air mixture within the combustion chamber After the trial period the power is removed from the ignitor In the safety circuit the photocell monitors the amount of flame turbulence inside the combustion chamber A lt domm im m aa A T Z lt LL Pans Ves S il lu A t 2 s feed y imi n a 7 T O A E c Air For Fuel System m Air For Combustion iium Fuel Hot Surface Ignition Models Service Manual TROUBLESHOOTING I SAFETY REQUIREMENTS This service manual is intended for use by individuals with an adequate knowledge of electrical and mechanical skills At tempts to repair this heater by individuals without those skills can result in personal injury as well as property damage Il CAUTIONS 1 Before servicing disconnect the heater from the electri cal power source by removing the electrical plug from the wall receptacle Note When certain tests require electrical power to be applied connect electr
37. from filter end cover Re move 4 side cover screws that attach the side cover to the heater Allow side cover with ignition control attached to rest on fuel tank flange Disconnect only the photocell wires from ignition control Attach the HA1170 leads to the photocell terminals on the ignition control Plug the Toggle Switch power cord into a grounded 120V 60 Hz outlet When EG the motor starts turn the HA1170 toggle switch to the Test Leads flashing red LED position see page 10 for HA1170 calibration procedures If the motor shuts off after 3 or 4 seconds the control is defective and should be replaced I If the motor continues to run in step 1 the photocell may Photocell be dirty or defective 18 Hot Surface Ignition Models Service Manual 2 Defective or Dirty Photocell Assembly Inspect the lens of the photocell for soot dirt etc If dirty wipe off with a clean damp cloth Remove photocell assembly from heater Turn the toggle switch on the HA1170 tester to the solid red LED posi tion Place the photocell boot over the red LED on the tester Connect the leads of an ohmmeter to the termi nals on the photocell assembly Use the 0 to 20 000 OHM scale on the meter The resistance should measure 11 000 OHMS or less If not the photocell is defective and should be replaced Block off the light source by putting thumb over opening of photocell Replace the photocell if a change in resis tance is n
38. he Troubleshooting section prior to replacement Photocell Ignition Control mounted on side cover 3 Hot Surface Ignitor All models will use 102548 03 Ignitor Kit The hot surface ignitor is rated for 120 volts With the rated voltage applied the ignitor element heats up to 1400 Celsius 2550 Fahrenheit within 5 seconds When the atomized fuel is sprayed by the nozzle it is ignited by this extremely hot surface Note It is important for the service technician to be cautious when working with the hot surface ignitor due to its extremely high operating temperature Care should also be taken not to bend or strike the ignitor element Ignitor Block Ignitor Element II FUEL SYSTEM FUEL FILTERS There are several types of fuel filters used on different model heaters The filters are always located in line with the fuel pickup tube The purpose of the filter is to eliminate the possibility of dirt dust etc from entering the nozzle and restricting the flow The filters should be inspected and cleaned whenever a heater is brought in for service It is also important that the bottom of the tank be inspected for sedi mentation or dirt buildup The filters design is such that a possible restriction in the filter screen can be present during operation and be dislodged back into the tank when the heater is shut off W B U 35 40 50 55 110 115 150 200 000 Btu 60 and 70 000 155 and 165 000 Mo
39. he capacitor is wired internally and cannot be replaced No service parts are available and entire motor assembly should be replaced Improper Voltage Input to Heater The specified voltage operating range for this product is 108 to 132 volts rms 60 hertz Verify that the voltage applied to the heater while the motor is running is at least 108 volts and does not exceed 132 volts Refer to the Electrical section of this manual page 5 for proper ex tension cord sizing 16 Hot Surface Ignition Models Service Manual OBSERVED FAULT Ignitor Does Not Heat Up and Motor Does Not Start Within 5 Seconds Possible Causes External to Heater Possible Causes Internal to Heater Circuit Breaker is Tripped O Check for Broken or Frayed Wires on Power Cord or Extension Cord 2 If External Thermostat is Used Plug Heater Directly Into AC Source 3 to Isolate Source of Problem Bad Electrical Connection s or Wired Incorrectly Blown Fuse on Ignition Control Assembly Defective Ignition Control Assembly TEST PROCEDURE power to control Meter should read 0 volts for five sec onds 120 volts for 3 to 4 seconds then drop to 0 volts If O Bad Electrical Connection s or Wired Incorrectly measurements differ from those described control is de Verify that all connections to the ignition control assem fective and should be replaced bly are secure and wired according to the wiring diagram Ignitor Motor Ignitor
40. he ohmmeter on the 0 to 200 OHM scale check for continuity across terminals where wires were removed Meter should indicate O Spark Plug Ignition Models Service Manual OBSERVED FAULT Safety Control Trips out Within the First Minute of Operation Defective Safety Control Defective Photocell Loose Wire Nut or Terminal Board Connection TEST PROCEDURE O Defective Safety Control 098205 04 Make sure unit is disconnected from AC source Discon nect the blue wire coming from safety control that is con nected to blue wire at photocell connection is made in smaller wire nut connection Connect the blue wire from control under the wire nut connection where the white wires are connected Plug unit into AC supply If the reset button on the safety con trol pops out and unit shuts off the control is defective and must be replaced Heater Ignites and Burns However Safety Control Trips and Heater Shuts Off Safety Control Trips out After Several Minutes of Operation 4 Dirty Photocell Check for Proper Pump Pressure Check for Restricted Fuel Flow Due to A Seal Leak B Fuel Filter Blocked C Restriction in Nozzle of Burner Head Fuel Cap and Gasket Not Vented Fuel Cap has More than one Gasket 19 2 Defective Photocell Inspect the lens of the photocell for soot dirt etc If dirty wipe off with a clean damp cloth Remove photocell from heater and connect ohm
41. ical power only for the time nec essary to complete the test 2 Do not bypass safety devices except when instructed to do so during troubleshooting procedures 3 Ifreplacement parts are necessary do not substitute with non factory parts use only factory authorized replace ment parts 4 Make sure all electrical connections are secure and cor rect prior to connecting heater to a grounded electrical power source Ill USING THE HA1170 TESTER The HA1170 control photocell tester provides a means of troubleshooting the forced air kerosene heater by verifying the operation of the ignition control and photocell Operation The tester s toggle switch has three positions The middle position puts the tester in the OFF mode The switch should be kept here when the tester is not in use to conserve battery power With the switch in the ON position the red LED is on continuous This 2foot candle light source can be used to test the static resistance of the photocell With the switch in the PULSE position the red LED flashes off and on at a rate of 10 times per second 10 hertz This position is used to verify the proper operation of the ignition control Toggle Switch Test Leads LED Light HA1170 Tester Calibration IMPORTANT This tester will not function properly without adequate battery power Prior to using the tester the full load battery voltage must be verified as follows Remove the battery cover to expose th
42. ine Note Fuel Filter Location May Vary According To Model 21 Spark Plug Ignition Models Service Manual Fuel Cap and Gasket Not Vented Inspect the vent hole and gasket under the fuel cap to make sure the passage is open Remember that since the fuel is being drawn from the tank the tank must be vented for proper operation gt Fuel Cap Has More Than One Gasket Make sure cap has only one gasket installed OBSERVED FAULT Frequent Plug Fouling Delayed Igniton O Spark Plug Too Close to Spray Pattern of Nozzle 2 Wrong Fuel TEST PROCEDURE Spark Plug Too Close to Spray Pattern of Nozzle It may be necessary in some cases to move the spark plug back from spray pattern of nozzle The best method is to shim the plug back by placing a standard spark plug washer under the flat of the plug at threaded area This moves the plug back approximately 1 inch and reduces the possibility of the plug fouling with carbon or the plug becoming wet during the ignition cycle 2 Wrong Fuel Refer to Fuel Selection on page 5 of this manual 22 Spark Plug Ignition Models Service Manual DIAGRAMS AND CHARTS I WIRING DIAGRAMS Reset R Red Button ue Blue Fi Safety White Red Control Black Photocell W Red White Electronic gnitor Power Motor G
43. item numbers and the accessory description QUE tHiS manual ITEM NUMBER ACCESSORY INSTRUMENT RANGE PART NUMBER HA1176A Parts Kit All Models HA1180 Air Gauge All Models eee Tester gt ee Ld HA1210 Thermostat Forced Air amp LP Forced Air bi dtr She Saas HA1202 Heavy Duty Wheel Kit a gt ZZ A Fits 35 40 50 55 60 70 Models 0 200 Ohm HA1206 Wheel Kit TN Fits 35 40 50 55 60 70 Models inue s am HA2203 Rear Handle Fits 110 115 Models HA2204 Rear Handle a Fits 150 155 165 200 Models HA1170 Control HA2210 Filler Neck Screen Tester peer ITEM NUMBER REPLACEMENT PART 104068 03 Ignition control Fits 35 40 50 55 60 Models 104068 02 Ignition control Fits 70 110 115 150 155 165 200 Models HA3004 Rotor Kit 1 2 HA3006 Nozzle 35 40 Models Refer to Owner s Manual Nozzle 50 55 Models HA3024 Nozzle 60 Models HA3026 Nozzle 70 Models E HA3027 Nozzle 110 115 Models SPR ANIE HA3028 Nozzle 150 155 Models HA3029 Nozzle 165 Models 100735 31 Nozzle 200 Models 102548 03 Hot Surface Ignitor HA3014 Air Filter Kit 35 40 50 55 60 70 Models HA3017 Filter Kit 110 115 150 155 165 200 Models HA3005 Rotor Kit 5 8 M16656 24 Photocell HA3020 Pump Adjustment Kit Hot Surface Ignition Models Service Manual SPECIFICATIONS I GENERAL SPECIFICATIONS 1 Fuel Selection One of the most critical spe
44. lcohol or other highly flammable fuels Fueling a Personnel involved with fueling shall be qualified and thoroughly familiar with the manufacturer s instructions and applicable federal state and local regulations re garding the safe fueling of heating units b Only the type of fuel specified on the heater s data plate shall be used c All flame including the pilot light if any shall be ex tinguished and the heater allowed to cool prior to fu eling d During fueling all fuel lines and fuel line connections shall be inspected for leaks Any leaks shall be re paired prior to returning the heater to service At no time shall more than one day s supply of heater fuel be stored inside a building in the vicinity of the heater Bulk fuel storage shall be outside the struc ture f All fuel storage shall be located a minimum of 25 feet from heaters torches welding equipment and similar sources of ignition exception the fuel reservoir integral with the heater unit Whenever possible fuel storage shall be confined to areas where floor penetrations do not permit fuel to drip onto or be ignited by a fire at lower elevation D Q h Fuel storage shall be in accordance with the federal state or local authority having jurisdiction Never use heater where gasoline paint thinner or other highly flammable vapors are present Follow all local ordinances and codes when using heater Heaters used
45. meter on the 1000 Ohm RX1K scale Hold the lens up to a light source 60 watt light bulb direct sunlight etc with the lens of the photocell pointed toward the light source The resistance of the meter should be low less than 500 ohms By blocking off the light source by putting thumb over opening of photocell the resistance on meter should be high Replace the photocell if a change in resistance is not observed during the above test Mm IU Ne n Spark Plug Ignition Models Service Manual 3 Loose Wire Nut or Terminal Board Connection Physically check that all electrical connections are se cure and making electrical contact 4 Dirty Photocell See step 2 column 1 8 Check for Proper Pump Pressure Install HA1180 Pressure Gauge or equivalent to rear of air filter housing Start heater and adjust air pressure to specified pressure Turning adjustment screw clockwise increases pressure counterclockwise decreases pres sure The screwdriver must be removed from the slot after any adjustment before taking a reading on the gauge See Heater Performance Specifications on page 6 for specified pressures Note Pressure gauge must be scaled in 1 4 pound in crements for accurate measurement 6 Check for Restricted Fuel Flow Remove the burner head from heater Using a socket wrench carefully remove the nozzle from burner head Be extremely careful not to scratch or score the face of the nozzle
46. mp parts removed apply 8 to 12 drops of a non detergent oil to the sleeve bearing on the fan of the motor The bearing located at the pump end is of the ball bearing type and should not be lubricated DO NOT OIL PUMP END BEARING Note Motor manufactured after 1978 have permanently lubricated sleeve bearing and cannot be oiled Open Motor Windings Motors Without Relay 30 000 35 000 50 000 and 55 000 BTU With the heater disconnected from AC plug connect the ohmmeter on the RX1 scale to the wires coming from motor On smaller heaters the leads from the motor should indicate a resistance of 6 to 8 ohms Actual resis tance varies between motor types Note Resistances may vary due to motor temperature Motors with Relays 70 000 100 000 110 000 150 000 165 000 and 200 000 BTU Start Winding Connect the ohmmeter on the RX1 scale to the white and black wires coming from motor This procedure al lows you to determine the condition of the start winding If the meter indicates infinity open circuit or the meter goes full scale zero ohms the winding is defective and the motor must be replaced Actual resistance varies between motor types Main Winding Connect the ohmmeter on the RX1 scale to the red and white wires coming from motor If the needle does not move again or goes to full scale the motor must be re placed Actual resistance varies between motor types Note Motor may vary according to model
47. om of the tank be inspected for sedi mentation or dirt buildup The filter s design is such that a possible restriction in the filter screen can be present during operation and be dislodged back into the tank when the heater E Z Qu o IV COMBUSTION SYSTEM Burner Head The burner head is mounted to the rear of the combustion chamber The purpose of the burner head is to meter and mix the amount of air entering the chamber to obtain proper combustion characteristics The nozzle is mounted in the center of the burner head andis surrounded by fins so thatthe amount of air entering the chamber from the burner head is equal and balanced The size of the slots in the burner head differ between models V ALL SYSTEMS WORKING TOGETHER There are four basic systems within the heater the fuel system the air system the electrical system and the combus tion system An air pump A on one end of the motor shaft forces air through the air line G and out the burner nozzle I The moving air creates a pressure differential in the burner head N causing fuel to be drawn from the tank J The fuel air mixture is sprayed into the combustion chamber L in a fine mist Addition air is supplied to the combustion chamber by a fan O to enter the combustion chamber where it mixes with the air and fuel from the nozzle The remaining air is directed around and over the combustion chamber This air mixes with the heated air from the combustion ch
48. ot observed The resistance should measure greater than 50 000 OHMS use the 1 megohm scale on the meter u r I d CU 3 Bad Electrical Connection s or Wired Incorrectly Verify that all electrical connections are secure and mak ing electrical contact Verify that wiring is per the wiring diagram see diagram page 23 4 Photocell Boot Not Properly Seated in Bracket Make sure photocell boot is seated in bracket securely See illustration that follows Photocell Correct Photocell Placement Incorrect Photocell Placement 19 Hot Surface Ignition Models Service Manual G Check for Proper Pump Pressure Install HA1180 Pressure Gauge or equivalent to rear of air filter housing Start heater and adjust air pressure to specified pressure Turning adjustment screw clockwise increases pressure counterclockwise decreases pres sure The screwdriver must be removed from the slot after any adjustment before taking a reading on the gauge See Heater Performance Specification on page 6 for specified pressures It may be necessary to con nect the HA1170 tester in place of the photocell while adjusting the pressure due to the fast shutdown response of the control Note Pressure gauge must be scaled in 1 4 pound in crements for accurate measurement HA1180 Pressure Gauge Flat Blade Screwdriver Adjustment Screw 6 Dirty Clogged Air Filters in Compressor 20 Inspect an
49. r a conventional type fuel pump It is important for the service technician to understand the nozzle operation In many cases concerning improper operation of a heater the problem is the result of a seal leak or a restriction dust dirt being present within the nozzle It should also be pointed out that each model heater requires different nozzles due to different fuel flow rates Compressed 2 Air From Pump Nozzle Face Fuel Lifted From Tank by Negative Pressure ll ELECTRICAL SYSTEM 1 Motors The motors used on the low pressure heaters are fractional horsepower motors ranging from 1 15 HP on the smallest heater to 1 4 HP on the largest heaters The motors used can be grouped into two categories The first category is the shaded pole motor The shaded pole motor contains a single winding and does not require an integral start run capacitor for operation This type of motor is used on 35 40 50 55 and 60 model heaters The second category is the permanent start capacitor motor This motor contains two separate windings The first winding being the auxiliary or start winding and the second being the main or run winding This motor utilizes an integral start run capacitor which is wired internally and cannot be replaced This type of motor is used on the 70 110 115 150 155 165 and 200 000 Btu models AC LINE CAPACITOR AC LINE Shaded Pole Motor Permanent Start Capacitor Motor
50. rials be of a fire retardant nature These enclosure materials shall be securely fastened to pre vent them from igniting or from upsetting the heater due to wind action Use only in well vented areas Before using heater pro vide at least a three square foot opening of fresh outside air for each 100 000 Btu Hr of rating This heater produces carbon monoxide which is listed by the State of California as a reproductive toxin under Proposition 65 Use only in places free of flammable vapors or high dust content Use only the electrical voltage and frequency specified on model plate Use only a three prong grounded extension cord Minimum heater clearances from combustibles Outlet 8 Ft Sides 4 Ft Top 4 Ft Rear 4 Ft Locate heater on a stable and level surface if heater is hot or running or a fire may occur When moving or storing heater keep heater in a level position or fuel spillage may occur Keep children and animals away from heater Unplug heater when not in use When used with thermostat heater may start anytime Never use heater in living or sleeping areas Never block air inlet rear or air outlet front of heater Never move handle refuel or service a hot operating or plugged in heater Never attach duct work to front or rear of heater Approved by the New York City Fire Department under certificate of approval 4803 4860 4908 or 4909 To be used only at construction sites in accordance wi
51. rovide cross ventilation to achieve better air movement 4 Heater Sizing The user should be aware of the proper size heater needed for a particular application It is easy to see that a 35 000 BTU heater would not heat a large warehouse but the question is sometimes asked What size heater should use A simple formula that can be used to determine heater BTU require ments follows Cu Ft of Area X 133 X Desired Temp Rise F BTU Size Needed Example Area 50 X 25 X 10 12 500 Cu Ft Desired Temp Rise 30 F 12 500 Cu Ft X 133 Factor 1662 5 X30 Temp Rise 49 875 Proper Heater Size ANSWER A 50 000 BTU heater should be selected for this application Hot Surface Ignition Models Service Manual I HEATER PERFORMANCE SPECIFICATIONS Technical Service Heater Performance Data Heater Model BTU Pump Nozzle Motor Ignitor Control Fuel Hot Air AMPS Rating PSI Part No Horsepower Kit Board Tank Output Running t 1 Capacity C F M Gal R35D 35 000 0 100735 02 0 100088 01 102548 03 104068 03 REM35C HA3006 102001 01 R40 40 000 0 100735 02 0 100088 01 102548 03 104068 03 REM40 HA3006 102001 01 R55A 55 000 6 100735 17 0 100088 01 102548 03 104068 03 REM55A HA3024 102001 01 R60 60 000 100735 17 0 100088 01 102548 03 104068 03 REM60 HA3024 102001 01 RM60 R70D 70 000 100735 18 gt 103609 01 102548 03 104068 02 R70DT HA3026 102001 20
52. s filter s purpose is to prevent any carbon dust from rotor or blade wear from entering the air passages in the nozzle This filter is non cleanable and should be replaced when considerable buildup of carbon dust is observed See drawings below Air Output Filter Air Output Filter Air Input Filter 30 000 35 000 50 000 55 000 100 000 110 000 150 000 and 70 000 BTU Filter System 155 000 165 000 and 200 000 BTU Filter System 3 Nozzle As mentioned previously the purpose of the air pump is to compress air and deliver it to the nozzle The compressed air as it travels through the nozzle creates a negative pressure that extends back through the center of the nozzle This negative pressure lifts the fuel from the fuel tank The fuel from the fuel tank and the compressed air are mixed at the nozzle which results in a very fine mist of fuel being sprayed into the combustion chamber The air pump nozzle combination eliminates the need for a conventional type fuel pump It is important for the service technician to understand the nozzle operation In many cases concerning improper operation of a heater the problem is the result of a seal leak or a restriction dust dirt being present within the nozzle It should also be pointed out that each model heater requires different nozzles due to different fuel flow rates Rubber Seal Separating Air Fuel Channels in Nozzle z Compressed Air From Pump Nozzle Face t
53. sistance is Note Motor may vary not within the specified range motor is defective and according to model should be replaced NOTE Resistances may vary due to motor temperature MOTOR WINDING RESISTANCE MODEL RESISTANCE RANGE OHMS 35 000 50 000 55 000 60 000 5 57 6 81 70 000 6 03 7 37 100 000 110 000 150 000 155 000 165 000 4 14 5 06 200 000 3 96 4 84 Note In some cases it is possible for the resistance to read correctly without power applied and the motor still not work with power applied If the ignition control assembly is tested and found to be good then the motor is defective and should be replaced 15 Hot Surface Ignition Models Service Manual 6 Defective Ignition Control Assembly Disconnect motor wires from control Attach voltmeter leads to motor terminals on control Use 0 to 200 V A C scale on meter Plug power cord into a 120V 60 Hz grounded outlet Meter should read O volts for five sec onds 120 volts for 3 to 4 seconds then drop to 0 volts If the meter remains at 0 volts the control is defective and should be replaced e Defective Start Run Capacitors Motors used in 70 000 to 200 000 Btu model heaters are the Permanent Start Capacitor PSC type and are equipped with an integral start run capacitor If the resis tance of the motor windings read correctly and the igni tion control assembly is found to be working properly the capacitor may be open circuit T
54. t 30 50 70 Models HA3017 Filter Kit 100 110 150 155 165 200 Models HA3025 Tune Up Center Display HA3005 Rotor Kit 5 8 HA3021 Nozzle 55 Models HA3023 Nozzle 165 Models HA3019 Photocell HA3020 Pump Adjustment Kit Spark Plug Ignition Models Service Manual Tune Up Center The Tune Up Center HA3025 shown below includes the parts listed SPECIFICATIONS GENERAL SPECIFICATIONS Part No Includes Qty Description 1 Fuel Selection HA1210 2 Thermostat One of the most critical specifications for trouble free opera tion is the use of a clean acceptable fuel Listed below are HAS009 095205 02 3 aa al Safety guidelines and comments concerning operation of heaters ak e with different fuels YA M22456 1 M22009 3 Rotor Kit RECOMMENDED COMMENTS FUELS n M ns Rotor Kit 5 8 Kerosene Bestoverall results Minimum odor and Meets Fuel Oil No 1 minimum maintenance No additives HA3006 100735 02 2 Nozzle Jet A necessary for cold weather operation HAS007 10073503 2 Nozzle ALTERNATE FUELS COMMENTS deese Nozzle Kit Fuel Oil No 2 Noticeable increase in odor Requires HA3009 100735 06 M8882 2 Nozzle Kit Diesel No 1 frequent maintenance of fuel filter FASOLI 0073507 M56692 2 Nozzle Kit Diesel No 2 nozzle and spark plug Requires a HA3012 M10962 2 4 Spark Plug winterizing additive at temperatures HA3013 M29835 3 Spark Plug belo
55. te and local regulations re garding the safe fueling of heating units b Only the type of fuel specified on the heater s data plate shall be used C AII flame including the pilot light if any shall be extin guished and the heater allowed to cool prior to fuel ing d During fueling all fuel lines and fuel line connections shall be inspected for leaks Any leaks shall be repaired prior to returning the heater to service e At no time shall more than one day s supply of heater fuel be stored inside a building in the vicinity of the heater Bulk fuel storage shall be outside the structure f All fuel storage shall be located a minimum of 25 feet from heaters torches welding equipment and similar sources of ignition exception the fuel reservoir integral with the heater unit g Whenever possible fuel storage shall be confined to areas where floor penetrations do not permit fuel to drip onto or be ignited by a fire at lower elevation h Fuel storage shall be in accordance with the federal state or local authority having jurisdiction Never use heater where gasoline paint thinner or other highly flammable vapors are present Follow all local ordinances and codes when using heater Heaters used in the vicinity of tarpaulins canvas or simi lar enclosure materials shall be located a safe distance from such materials The recommended minimum safe distance is 10 feet It is further recommended that these enclosure mate
56. th applicable New York City Codes Regulations Rules Directives Permits etc Warning to New York City Residents For Use Only At Construction Sites in accordance with applicable NYC codes under NYCFD certificate of approval 4803 4899 4908 4909 or 4934 Hot Surface Ignition Models Service Manual TABLE OF CONTENTS General Information Arrangement of Manual 3 Il Technical Service Department 3 Ill Service Preparation 3 IV Tools Required u 4 R a i ET E EEE EE A 4 Specifications General Specifications 1 Fuel Selection 5 2 Electrical a 5 3 Ventilation 5 4 Heater Sizing eessseeeeess 5 Il Heater Performance Specifications 6 Component Operation l Air System T Air Pumps e a 7 25 AI PIETS dianan n uha dt iia 7 By INOZZIG iai eee n rte E 7 ll Electrical System T MOLOES sun um n uhu A una mas 7 2 Ignition Control Photocell 8 3 Hot Surface Ignitor 8 Ill Fuel System a 8 IV Combustion System 9 V All Systems Working Together 9 Troubleshooting l Safety Requirements
57. ty If Equipped With Built In Thermostat DESA INTERNATIONAL Technical Service Department P O Box 90004 2701 Industrial Drive Bowling Green Kentucky 42102 www desatech com SECTION B SERVICE MANUAL LOW PRESSURE PORTABLE FORCED AIR HEATER SPARK PLUG IGNITION MODELS Spark Plug Ignition Models Service Manual SAFETY INFORMATION AX warnines IMPORTANT Read this owner s manual carefully and completely before trying to assemble operate or ser vice this heater Improper use of this heater can cause serious injury or death from burns fire explosion electrical shock and carbon monoxide poisoning A DANGER Carbon monoxide poisoning may lead to death Carbon Monoxide Poisoning Early signs of carbon monoxide poisoning resemble the flu with headaches dizziness and or nausea If you have these signs the heater may not be working properly Get fresh air at once Have heater ser viced Some people are more affected by carbon monoxide than others These include pregnant women persons with heart or lung disease or anemia those under the influence of alcohol and those at high altitudes Make certain you read and understand all warnings Keep this manual for reference It is your guide to safe and proper operation of this heater Use only kerosene or No 1 fuel oil to avoid risk of fire or explosion Never use gasoline naphtha paint thinners a
58. ult in burns if one is not careful Spark Plug Ignition Models Service Manual IV TOOLS REQUIRED In addition to common hand tools the service shop should have the following tools and instruments for proper repairing of the heaters These instruments will be referred to through out this manual V PARTS Accessories In addition to the standard parts we now offer parts kits Listed below are the item numbers and the accessory description INSTRUMENT RANGE PART NUMBER Pressure Gauge 0 15 PSI HA1180 Feeler Gauge 001 to 1 inch None Volt Ohmmeter RX1 AC 250V None Available at any auto parts store Available at most electronic stores ITEM NUMBER ACCESSORY HA1176A Parts Kit All Models HA1180 Air Gauge All Models HA1210 Thermostat Forced Air amp LP Forced Air HA1202 Heavy Duty Wheel Kit Fits 30 35 40 50 55 70 Models HA1206 Wheel Kit Fits 30 35 40 50 55 70 Models HA2203 Rear Handle Fits 100 110 Models HA2204 Rear Handle Fits 150 155 165 200 Models HA2210 Filler Neck Screen HA3003 Flame Out Safety Control HA3004 Rotor Kit 1 2 HA3006 Nozzle 35 40 Models HA3007 Nozzle 50 Models HA3008 Nozzle 70 Models HA3009 Nozzle 100 110 Models HA301 1 Nozzle 150 155 Models HA3012 Spark Plug 70 100 150 155 165 200 Models HA3013 Spark Plug 35 50 Models HA3014 Air Filter Ki
59. w 20 F HA3014 M29632 M29612 01 3 Air Filter Kit 2 Electrical M29633 The heater must be connected to a standard electrical outlet HA3017 M12179 M11637 3 Filter Kit 120V 60HZ For safety all heaters are equipped with a three M12244 1 M51150 01 prong power cord which must be grounded When selecting an extension cord for heater usage the following chart should HA3019 M16656 16 Photo Cell be used in determining wire size HA3020 M10993 1 M22997 Pump Adjustment LENGTH OF CORD WIRE SIZE AWG M27694 M8940 Kit 100 Ft No 14 200 Ft No 12 300 Ft No 10 400 Ft No 8 TUNE UP CENTER No 6 HA3006 HA3004 NOZZLE KIT HA3007 HA3008 HA3009 HA3011 NOZZLE NOZZLE NOZZLE NOZZLE KIT KIT KIT KIT HA3014 HA3017 HA3017 HA3002 FILTER FILTER KIT AIR FILTER KIT KIT SAFETY CONTROL HA1200 HA3012 HA3013 HA1200 3 Ventilation The heater should be used only in well ventilated areas Asa rule the following minimum requirements should be followed HEATER SIZE BTU SQUARE FOOT OPENING 30 000 35 000 1 0 Sq Ft 50 000 55 000 1 6 Sq Ft 70 000 2 1 Sq Ft 100 000 110 000 3 2 Sq Ft 150 000 155 000 4 5 Sq Ft 165 000 5 0 Sq Ft 200 000 6 0 Sq Ft The above is based on ventilation requirements of at least a 3 sq ft opening per 100 000 BTU If possible it is better to provide cross ventilation to achieve better air movement Spark Plug Ignition Models Service Manual 4 Heater Sizing

SERVICE MANUAL

Contents

Download Pdf Manuals

Related Search

Related Contents