VF Ceramic Heat Service Manual
Contents
1. 13 VENT FREE GAS Ma TROUBLESHOOTING excessive lint from carpeting bedding material etc Ignition Problems Problem No Spark Possible Causes 1 Ignitor cable 2 Ignitor electrode position and or cleanli ness 3 Ignitor electrode body cracked 4 Control knob not fully depressed 5 Control valve malfunction Procedures 1 Check the ignitor cable at the point of connection to the ignitor electrode Be sure that the cable insulation is not split or damaged and thatthe cable is fully pressed onto the serrated point of the ignitor elec trode 2 Inspect the ignitor electrode to be sure that itis properly positioned in the bracket and Porcelain Body Ignitor cable point of connection _ Cable Insulation HEATER Installation and repair should be done by a qualified service person in accordance with local ordinances and codes The room heater should be inspected before use and at least annually by a professional service person It is important that control compartments burners and circulating air passageways of the room heater be kept clean More frequent cleaning may be required due to Inspect the porcelain body of the ignitor Be sure that the control knob is fully de If sparking is still not observed after the Figure 13 Ignitor Electrode Assembly SERVICE MANUAL that it is free of dust grease carbon build up or moisture Clean the ignitor with a dry rag and rete2. SERVICE MANUAL VENT FREE GAS HEATERS CERAMIC PLAQUE MODELS 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 WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance e Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department WARNING Improper installation ad justment alteration service or mainte nance can cause injury or property dam age Refer to this manual for correct installation and operational procedures For assistance or additional information consult a qualified installer service agency or the gas supplier Save this manual for future reference TABLE OF CONTENTS VENT FREE GAS HEATER SERVICE Section 1 Safety Information Safety Requirements issnin ienne ik edie iirin iseni Warning Steisean an ea a a lots Section 2 Introduction Technical Service Department ecceeeceeeeeeeeeeteeeeeeeteaeeseeseaeeseeeeaeesneeeteeeeeeeeaes Product FEAtures r S eee eth ae ee ACCOESSONIGS st asic eS eee atta Slat be aes ttl tS ats et E oe Ne tlds Bn Section 3 General Operation and Component Descriptions General Operations ainn ied nel ide ne dhe pied ete dies B
3. Be sure that the following safety precautions have been followed for locating the heater 1 D NOT install the heater in sleeping quar ters mobile homes or recreational vehicles 2 D NOT install heater as a fireplace insert 3 The heater should be located to give easy access for operation servicing and inspec tion 4 DO NOT install in areas where curtains drapes clothing or other flammable materi als are within 36 inches of the front top and sides of the heater 5 This heater has been designed for wall mounting The clearances from the heater to combustible surfaces MUST NOT be less than shown in Figure 7 These are absolute minimum clearances Greater clearances should be allowed if possible The heater can also be mounted to an optional floor mounting base that is sold as a separate accessory If a base accessory is used be sure the base is securely at tached to the floor If the heater is installed in a residential garage the following precautions should be taken 1 The heater pilot and burners must be at least 18 inches above the floor 2 The heater must be located or reasonably protected so as not to be subjected to damage by a moving vehicle a CEILING 36 6 Minimum Minimum From dy Sides Of Heater Left Right Side Side ne 7 D 3 Minimum To Top Surface 1 Of Carpeting Tile Or Other Combustible Material Figure 7 Mounting Clearances As Viewed From Front
4. of Heater VENT FREE GAS Gas Supply Installation HEATER SERVICE MANUAL 1 IMPORTANT must be held with wrench when connecting gas piping and or fittings to pressure regulator Use only new black iron or steel pipe Copper tubing may be acceptable in some areas but should be internally tinned or equivalently treated to resist corrosion by sulphur compounds CHECK LOCAL CODES The gas supply line shall be sized and installed to provide a sufficient supply of gas to meet the maximum demand of the heater without undue loss of pressure Model Installed 3 Plaque Models 5 Plaque Models Supply Line 3 8 inch or greater 1 2 inch or greater The sealant used on the threaded joints of the gas pipe must be the specific type resistant to the action of liquid petroleum LP gas Apply sealant lightly to the male threads to ensure excess sealant does not enter the lines Any excess sealant could be forced into the pipe and result in clogged valves Pressure regulator 1 8 NPT Plug Tap External Regulator For LP Heaters Only Drip Leg Trap 4 The supply system must include a manual shut off valve a union in the line and a plugged 1 8 inch NPT tap The tap should be accessible for test gauge connections upstream of the gas supply connection to the heater Include a drip leg trap in the supply line The purpose of the drip leg is to prevent moisture and contaminants in the gas sup ply f
5. pilot and observe to see if the pilot flame is more stable Replace the front cover Liftoff Natural Gas Figure 18 Thermocouple Liftoff 16 VENT FREE GAS HEATER SERVICE MANUAL If the pilot flame is short as shown in Figure 20 check for low pressure to the pilot First be sure that the gas supply inlet pressure to the heater is adequate Check the line for proper size Second check manifold pressure with a OS manometer to be sure that the regulator is not defective See SPECIFICATIONS on page 13 for the model you are servicing Figure 20 Short Flame Third check the pilot assembly and pilot line to be sure that a restriction such as Connect Rubber dust or dirt is not present Blow out the pilot Hose At Manifold assembly from both directions to remove Pressure Tap any dirt Replace the pilot assembly if nec essary Oo 6 EA 4 7 7 7 0 5 3 3 5 0 2 Manifold Pressure Tap 1 8 NPT Control Control Valve Valve Manometer 3 Plaque 5 Plaque 3 Plaque 5 Plaque Thermostat amp Thermostat Thermostat amp Thermostat amp Non Thermostat Propane Models Non Thermostat Non Thermostat amp 5 Plaque Natural Gas Natural Gas Non Thermostat Models Models Propane Models Figure 21 Measuri
6. to 15 seconds before releasing Check to be sure that the pilot flame pat tern is correct see Figures 15 amp 16 Figure T5 Correct LP Pilot Flame as Pilot Flame If the pilot flame appears to be normal check the control valve according to the test procedure outlined on page 12 under Testing Control Valve and Thermocouple If the valve passes the testing the thermo couple may be defective and should be replaced If the pilot flame is lifting off the thermo couple as shown in Figure 17 check to be sure that the room is properly ventilated See SPECIFICATIONS page 13 for the minimum fresh air openings required If necessary instruct the user to slightly open a window for proper ventilation Be sure that strong or gusty drafts are not blowing on the heater If necessary the HEATER 1 4 Rod os Figure 19 Cold Start Choke Adjustment SERVICE MANUAL Natural Gas Figure 19 Pilot Barrel Liftoff LP heater should be relocated to a more protected area If the pilot flame is incorrect as shown in Figure 18 it is possible that the cold start choke is allowing too much air to enter the pilot tube Turn the heater off remove the front cover from the heater and inspect the cold start choke on the pilot tube Insert a 1 4 inch diameter rod i e a 1 4 inch drill bit will do under the bi metal strip to adjust the cold start choke to the nearly closed position see Figure 19 Relight the
7. 00A VP2600B LP Only 14 11 1 2 or greater 1 2 NPT 8 2 7 8 Manual 7 9 7 5 MANUAL VP2600T VP2600TA LP Only 14 11 1 2 or greater 1 2 NPT 8 2 7 8 Manual with Thermostat 7 2 6 8 028 70 drill 028 70 drill 028 70 drill 042 58 drill Burner Orifice Diameter Burner Orifice Diameter B Model BTU HR Output Maximum Minimum Fresh Air Opening Minimum 041 59 drill 042 58 drill 18 000 6 600 18 sq in BTU HR Output Maximum 16 000 16 000 26 000 26 000 Minimum 6 000 6 000 6 000 11 000 Fresh Air Opening Minimum 16 sq in 16 sq in 26 sq in 26 sq in AAA in MODELS VN1800 VN1800T VN3000 VN3000T VN1800A VN1800TA VN3000A VN3000TA VN1800B VN3000B Gas Type Natural Only Natural Only Natural Only Natural Only Inlet Gas Pressure Inches W C Maximum 10 5 10 5 10 5 10 5 Minimum 7 7 7 7 Supply Line 3 8 or greater 3 8 or greater 1 2 or greater 1 2 or greater Inlet Fitting Size 1 2 NPT 1 2 NPT 1 2 NPT 1 2 NPT Regulator Pressure Inches W C Maximum 6 2 6 2 6 2 6 2 Minimum 5 8 5 8 5 8 5 8 Control Valve Type Manual Manual with Manual Manual with Thermostat Thermostat Manifold Pressure Inches W C Maximum 5 5 5 5 5 2 5 2 Minimum 5 1 5 1 4 8 4 8 043 57 drill 043 57 drill 043 57 drill 18 000 6 600 18 sq in 042 58 drill 30 000 6 600 30 sq in 30 000 12 000 30 sq in
8. LACEMENT PARTS Note Use only original replacement parts This will protect your warranty coverage for parts replaced under warranty Parts Under Warranty Contact authorized dealers of this product If they can t supply original replacement part s call DESA International s Technical Service Department at 1 800 323 5190 When calling DESA International have ready your name e your address e your heater s model number e how heater was malfunctioning e type of gas used propane or natural gas purchase date In most cases we will ask you to return the defective part to the factory Parts Not Under Warranty Contact authorized dealers of this product If they can t supply original replacement part s call DESA International s Parts Department at 502 781 9600 When calling DESA International have ready e your heater s model number e the replacement part number ILLUSTRATED PARTS LISTS Illustrated parts lists can be obtained free of charge Send a self addressed stamped envelope to the address listed below List the heater model number and the date located in the lower right corner of this page DESA INTERNATIONAL Corporate Headquarters P O Box 90004 2701 Industrial Drive 098734 01 Bowling Green Kentucky 42102 9004 Rev D 502 781 9600 12 89
9. Remove the orifice s and examine for dirt or particles which would restrict the flow of gas DO NOT attempt to clean the orifice s witha wire Blow out the orifice s or gently clean Replace the orifice s if neces sary 3 Check the burner orifice size Refer to the proper drill size in SPECIFICA TIONS on page 13 for the model you are servicing If an orifice is not the correct size it should be replaced Figure 22 Burner Orifice Problem Delayed ignition of main burner Possible Cause 1 Low pressure to one or more burner plaques Procedure 1 Check for the cause of low pressure by following procedure number 3 under Problem Gas odor at the bottom of page 19 18 VENT FREE GAS HEATER SERVICE MANUAL Combustion Problems Problem Backfiring during operation Possible Causes 1 Burner damaged 2 Low pressure to one or more burner Procedure 1 Inspect the ceramic burner plaques to see if the plaques are cracked or badly chipped If a burner plaque is cracked or broken replace the burner 2 Check for low pressure to the burner by plaques following procedure number 3 under Problem Gas odor bottom of page AAA Problem Smoke or unwanted odors Possible Causes 1 Oil or residue from manufacturing proc esses 2 Household chemicals Procedures 1 If oils or residues from manufacturing processes are present in the heater the problem will usually be eliminated a
10. Tools You May Need HEATER SERVICE MANUAL Phillips Screwdriver Slotted Screwdriver 1 4 inch Socket Nutdriver 5 16 inch Socket Nutdriver 5 16 inch Open End Wrench 5 8 inch Open End Wrench 7 8 inch Open End Wrench Equipment 9 mm Open End Wrench 10 mm Open End Wrench 11 mm Open End Wrench 13 mm Open End Wrench 15 64 inch Ignition Wrench Orifices 1 16 inch Punch Needle Nose Pliers The following items are recommended for servicing troubleshooting or installing vent free gas heaters Item Source Information 1 Water Manometer For Inlet and Mani fold Pressure Testing 2 BASO Millivolt Test Kit For Testing Valves and Thermocouples 3 Low Pressure Test Set For Leak Testing Gas Supply Line To Heater 4 Manual Shutoff Valve With 1 8 NPT Tap For Installing Heater To Gas Supply Controls Inc P O Box 52275 Raleigh North Carolina 1 800 334 5886 Item ESL 16 Approximate Cost 14 00 DESA International P O Box 90004 Bowling Green KY 42102 9004 502 781 9600 Item GA5000 Controls Inc P O Box 52275 Raleigh North Carolina 1 800 334 5886 Item 78060 Approximate Cost 40 00 DESA International P O Box 90004 Bowling Green KY 42102 9004 502 781 9600 Item GA5010 SECTION VENT FREE GAS INSTALLATION Before servicing the heater be sure that the installation conforms to local codes and all safety precautions outline
11. after installation or servicing All leaks must be corrected immedi ately A WARNING NEVER USE AN OPEN FLAME TO CHECK FOR A LEAK Apply a solution of liquid detergent and water to all connections The formation of bubbles indicate leaks that must be corrected Pressure Testing Supply Line 1 The heater and its control valve must be disconnected from the gas supply piping system during any testing of the gas supply piping system when test pressures are in excess of 14 W C 1 2 PSIG The heater must be isolated from the gas supply piping system by closing its individ ual manual shut off valve during any pres sure testing of the gas supply piping system when pressures are equal to or less than 14 W C 1 2 PSIG Testing Heater Gas Connections Testing Gas Supply Piping System 1 Inspect all connections from the gas supply to the manual shut off valve to be sure they are tight or closed Connect a low pressure gauge to the 1 8 inch NPT pressure tap see Equipment page 7 The manual shut off valve should be closed Open the gas supply service valve to pres surize the system Close the service valve tightly The low pressure gauge should read at least 11 inches W C Bleed off pressure by slowly opening the manual shut off valve to vent enough gas to reduce the pressure to exactly 10 inches W C If the pressure remains at 10 inches W C for 10 minutes you can assume the gas supply system is leak t
12. as to flow to the ting the PILOT setting or to turn the pilot and the main burner If the pilot heater off flame is extinguished or if the pilot flame lifts off of the thermocouple due to lack of oxygen the electric currentto the valve will be reduced and the plunger will close shutting off all gas flow to the heater The control valve will maintain gas flow to the main burner and the pilot burner only if the thermocouple which is mounted on the pilot burner is suffi ciently heated The heated thermo Gas Regulator The gas regulator is used to reduce theincoming NOTE Propane heaters also require an exter gas pressure to the appropri nal regulator 11 14 W C be in ate pressure for proper op stalled The external regulator is not eration of the heater The supplied with the heater regulator pressure is preset and cannot be adjusted Figure 5 Gas Regulator Oxygen Depletion System O D S The pilot burner is designed to produce a preci couple will cause the control valve to close sion flame which will lift off of the pilot shutting off all gas flow to the thermocouple if the oxy heater The oxygen deple gen content of the sur tion system is required rounding airis too low onall models of vent The resulting cooling free heaters covered of the pilot thermo by this manual Control Valve Figure 6 Oxygen Depletion System VENT FREE GAS Moa TOOLS AND EQUIPMENT
13. at 1 502 781 9600 SECTION VENT FREE GAS General Operation HEATER GENERAL OPERATION AND COMPONENT DESCRIPTIONS SERVICE MANUAL NOTE See Owner s Manual for operating procedure The heater is operated by the control knob located on the top of the heater Be sure that the service supply valve is open and that the manual shut off valve Figure 8 page 9 is fully open Depressing the control knob and turning it to the PILOT position will direct gas to the pilot and provide a spark to light the pilot The control knob must be held down at least 10 seconds until the thermocouple is heated enough to hold the valve open Once the pilot flame is established the control knob can be released and turned to any of the operating position settings The control knob can also be left in the Burner Assembly PILOT position so that the heater is ready to use Turning the control knob operates the control valve and directs the flow of gas to the pilot and the burner plaques The gas is mixed with air andis injected into the burner chambers through tubes in the bottom of the burner The air gas mixture burns on the surface of the ceramic burner plaques causing the ceramic plaques to glow with a radiant orange color With proper care and servicing the heater should give many years of satisfactory use to the customer Be sure to inspect and service the heater at least annually The burne
14. d in the Owner s Operation and Installation Manual In the absence of local codes the installation must conform with the National Fuel Gas Code ANSI Z223 1 1984 and ADDENDA Z223 1a 1987 also known as NFPA 54 Only qualified licensed or trained persons should install the product Gas Type HEATER SERVICE MANUAL For detailed installation instructions see the Owner s Operation and Installation Manual that is packaged with the heater Available from the American National Standards Institute Inc 1430 Broadway New York NY 10018 or from the National Fire Protection Association Inc Batterymarch Park Quincy MA 02269 Be sure that the type of gas supplied to the heater is the same as that indicated on the heater data plate If you observe that the gas supply is different than that specified on the heater data plate DO NOT operate the heater until the correct gas supply is installed Verify that the regulator burner orifices and pilot as Wall or Base Mounting sembly are for the same gas type as is indicated on the heater data plate see SPECIFICA TIONS page 13 DO NOT attempt to convert a heater from one gas type to another i e Propane to Natural Gas or vice versa If neces sary replace the heater with a model suitable for the type of gas being supplied Y AA See Owner s Manual for detailed instructions for wall or base mounting Location Safety Precautions
15. fter a A few hours of operation If odors persist remove the front panel and examine the inside of the heater cabinet for oil or foreign material 2 Some household chemicals such as paint hair spray or glues can produce unwanted odors when the heateris oper ating Ventilate the room and advise the user to discontinue using such products while the heater is operating Problem Gas odor Possible Causes 1 Gas leak 2 Defective control valve 3 Dirt or particles clogging gas line AX WARNING If you smell gas e Shut off gas supply e Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Procedures 1 Check all heater and gas supply connec tions for leaks See procedures under Testing Gas Supply Line Connections and Testing Heater Gas Connections on page 11 of this service manual 2 Ifall gas connections inside and outside of the heater have been checked and found to be free of leaks check for a defective control valve Visually examine the surface of the control valve to be sure that itis not cracked dented or damaged Asmall mirror and flashlight may be nec essary to examine the rear of the valve Check to be sure that the valve is mounted securely in a vertica
16. ight If the pressure drops apply a solution of liquid detergent and water to all connections and observe carefully for forming and expanding bubbles Bubbles forming indicate a leak that must be corrected 1 Remove the front panel of the heater by removing the two screws near the bottom corners and pulling the bottom of the panel forward and then downward Turn heater control knob to the OFF position Open the manual shut off valve see Figure 8 page 9 Apply solution of liquid detergent Correcting Leaks and water to all connections from the supply line to control valve Bubbles forming indi cate leaks that must be corrected Light the heater and check all remaining internal connections for leaks with the liquid detergent and water solution 1 To correct a leak on flared tubing first try tightening the connection If this doesn t work reflare or replace the section of tub ing On threaded piping try tightening or re doping first If the leak continues take the connection apart and inspect the threads If y necessary cut new threads or replace the section of piping If steps 1 and 2 fail to correct the problem look for pinholes in the pipe or fittings and check for splits in the tubing Replace ma terials or fittings that are defective MANUAL 11 VENT FREE GAS HEATER SERVICE MANUAL Testing Control Valve and Thermocouple The following procedure can be u
17. l position and that the control knob can be turned to all positions If any defect is found replace the control valve Be sure to test all gas connections for leaks after replacing the control valve 3 Low pressure to one or more burner plaques can result in improper combus tion and gas odor Check burner opera tion at the HIGH setting to see if all plaques have the same uniform color A lf one plaque is glowing less than the others dirt or particles may be clog ging the line between the valve and the burner or the burner pipe may be blocked by spider webs or other ob structions Turn off gas to the heater at the manual shut off valve below the heater Remove the appropriate gas line s to the burner and clean foreign matter from the tubing Check the burner orifices and clean if neces sary B If all plaques do not develop a full radiance check manifold pressure at the 1 8 NPT tap located next to the control valve See SPECIFICA TIONS on page 13 for the model of heater you are servicing If manifold pressure is low check inlet supply pressure to the heater If the inlet supply pressure is correct clean the inlet tube between the regulator and valve Replace the regulator and valve if necessary 19 TECHNICAL SERVICE You may have further questions about installation operation or troubleshooting If so contact DESA International s Technical Service Department at 1 800 323 5190 REP
18. m to help ventilate 9 If heater shuts off do not relight until you provide fresh outside air If heater keeps shutting off have it serviced 10 Do not run heater e where flammable liquids or vapors are used or stored e under dusty conditions 11 Never place any objects on the heater 12 Surface of heater becomes very hot when running heater Keep children and adults away from hot surface Heater will remain hot for a time after shutdown Allow surface to cool before touching 13 Make sure grill guard is in place before running heater 14 Do not alter heater or its controls Any change may create a safety hazard 15 Make sure heater is turned off unplugged and cool before servicing SECTION VENT FREE GAS INTRODUCTION Technical Service Department HEATER SERVICE MANUAL The Technical Service Department located in Bowling Green Kentucky is committed to as sisting our Authorized Service Centers and Deal ers to provide prompt efficient service If you need assistance or have questions about servic ing problems please call DESA International s Technical Service Department at 1 800 323 5190 Product Features NOTE This number is ONLY for technical serv ice assistance and CANNOT be used for order ing parts billing questions order status etc For sales department and parts ordering call 1 502 781 9600 The ceramic plaque heaters covered by this
19. move the brass cover and clean any dust or cob webs from the air gas mixing chamber Reassemble the brass cover with the wire clip and retest to see if a correct pilot flame is established If the above procedure does not give satisfactory results discon nect the pilot assembly and remove it from the heater Blow out the pilot tube from both directions to remove any restrictions Also inspect the pilot line tubing for dirt kinks in the line or other restrictions Re place the pilot assembly if necessary Check gas supply pressure at the pres sure tap on the manual shut off valve below the heater and at the manifold pres sure tap next to the control valve see Figure 21 page 17 tobe sure that enough pressure is available to the system ac cording to the SPECIFICATIONS sec tion on page 13 If the inlet pressure is correct and the manifold pressure is low replace the regulator control valve or inlet tubing as required Problem ___ Bi metal Strip __ Wire Clip Brass Cover Figure 14 Ignitor Pilot Assembly 15 VENT FREE GAS Pilot ignites but will not stay lit Possible Causes 4 Control knob not held down long enough 2 Defective valve or thermocouple 3 Not enough fresh air 4 Wrong air gas mixture at pilot Procedures 1 Figure Be sure that the control knob is held down long enough to get the thermocouple hot After lighting the pilot hold the control knob down for 10
20. ng Manifold Pressure How To Use A Manometer 1 Fill tube with water until you see the water 3 Read the manometer water level both level off at zero 0 on both sides above and below the zero 0 mark then 2 Connect rubber hose to the line to be add the readings to give the correct tested manifold pressure VENT FREE GAS HEATER SERVICE MANUAL Problem Main burner does not light pilot stays lit Possible Causes 1 Low inlet gas pressure 2 Burner orifice is clogged 3 Burner orifice is not correct Procedures 1 Be sure that the supply pressure and line size to the heater is adequate Refer to SPECIFICATIONS on page 13 for the model you are servicing If the supply line is the correct size and the supply pres sure is low contact your local gas com pany or LP supplier Propane LP Models Only A Be sure tank is not empty or nearly empty B Be sure tank is not frozen due to high usage rates on a small propane cylin der If many appliances or heating devices are being run off the same tank evaporation rates can cause the remaining liquid to cool and create frost or ice on the outside of the tank The ice acts as an insulator and can reduce the evaporation rate and the pressure to your heater If an im proper tank size is causing a low supply pressure to the heater con tactthe local LP gas supplier for proper tank sizing 2 Check the burner orifices to be sure that they are not clogged
21. r an open flame a BIC ere Y lighter can be used O 209 0 500 2 OO R rt D 0 1000 0 50 C MILLIVOLT MILLIVOLTS Thermocouple output specification 20 28 mv SS O ADJUST MILLIVOLTS MILLIAMPS If the thermocouple millivolt output is below specification replace the thermocouple Valve eras Figure 11 Testing Control Valve With BASO Milivolt Tester BASO Milivolt Tester MILLIAMPS O x 0 500 upo RON E O MO 0 1000 0 50 MILLIVOLTS DO MILLIVOLTS t A O ADJUST MILLIVOLTS MILLIAMPS Thermocouple Attachment lt Thermocouple Attachment Figure 12 Testing Thermocouple With BASO Milivolt Tester 12 VENT FREE Ma SPECIFICATIONS MODELS Gas Type GAS Inlet Gas Pressure Inches W C Maximum Minimum Supply Line Inlet Fitting Size Regulator Pressure Inches W C Maximum Minimum Control Valve Type Manifold Pressure Inches W C Maximum Minimum Burner Orifice Diameter Burner Orifice Diameter B Model HEATE VP1600 VP1600A VP1600B LP Only 14 11 3 8 or greater 1 2 NPT 8 2 7 8 Manual 7 9 7 5 028 70 drill 042 58 drill R VP1600T VP1600TA LP Only 14 11 3 8 or greater 1 2 NPT 8 2 7 8 Manual with Thermostat 7 9 7 5 SERVICE VP2600 VP26
22. r assembly is constructed of a plated steel burner case with ceramic plaques ce mented into the face A metal frame assures uniform spacing between the plaques The gas orifices are mounted at the bottom of the air gas inlet tubes The air gas mixture is distributed to Ignition System the plaques through the steel burner chambers and through the small holes in the ceramic plaques The air gas mixture burns near the surface of the ceramic plaques resulting in the production of both radiant and convected heat The ignitor assembly utilizes a piezo electric ignition system The spark gen erator is built into the con trol valve and will pro vide a spark to the pi lot when the control knob is fully de pressed and turned Control Valve Pe from the OFF position to the PILOT position The resulting high voltage spark ignites the gas atthe pilot tube The pilot flame will in turn light the main burners ig when the control knob is VL rotated to the desired heat setting Figure 3 Ignition System VENT FREE GAS HEATER SERVICE MANUAL Control Valve The control valve directs the flow of gas to the couple provides a low level electric current to an pilot burner and the main burners The con electromagnetic plunger in the control valve trol knob should be slightly depressed and This low level electric current keeps the rotated to select the appropriate heat set plunger open allowing g
23. rom entering the heater controls The drip leg should be within reach to permit cleaning or emptying A drip leg should not be located where condensation is likely to freeze Failure to use a drip leg can result in operational difficulties with the heater The gas supply to the heater must be regulated to maintain the inlet pressure within the follow ing limits Models Gas Pressure Inches W C Natural Gas 7 Min 10 5 Max Propane 11 Min 14 Max Valve Figure 8 Gas Connection VENT FREE GAS Propane Installations HEATER SERVICE MANUAL A CAUTION Propane models require an external regulator not supplied with heater The external regulator must be connected be tween the heater and the propane supply tank This regulator must reduce the incoming supply pressure to a maximum of 14 W C Under no circumstances should this heater ever be con nected directly to a propane supply tank My ub y ER oe ip ho A typical propane installation is shown below right in Figure 9 For details concerning tank or cylinder location and installation refer to NFPA Pamphlet No 58 and the laws in your locality CONNOTEA SN Manual Shuto Regulator 2 Figure 9 Typical Propane Installation External Regulators Vents Ex
24. sed to deter 5 If the control valve does not hold in mine if the valve and thermocouple meet speci increase current levels by 10 ma and fication This procedure requires a BASO milli repeat step 4 Repeat by 10 ma incre volt tester See Equipment page 7 ments until the valve holds in Note re sult PROCEDURE 1 Connectthe valve attachment to the con 6 Gradually reduce ma level until the con trol valve in place of the thermocouple trol valve drops out Note result 2 Plugthe valve attachment connectorinto Hold in current specification 230 ma maximum the BASO millivolt tester as shown in Drop out current specification 80 ma minimum Figure 11 Set BASO to 0 500 Milliamps Ifthe control valve operates correctly during the 3 Adjust the current to 80 ma if using dry above test it is likely that the problem is the cell batteries set the current level by result of a bad thermocouple adjusting the rotary volume knob 7 Connect the thermocouple attachment to the thermocouple as shown in Figure 12 Be sure the red clip is attached to the outer copper thermocouple sheathing 4 Turn control knob from the OFF position to the PILOT position Check to see if the control valve holds in satisfactory Set BASO to 0 500 Millivolts Gontral BASO 8 Lightthe burner pilot and continue to hold Va 2 Milivolt Tester the control knob down to keep the control valve open or remove the thermocouple and hold it ove
25. service manual have many features that assure customer satisfaction and comfort Infra red Heat The glowing ceramic burner plaques give off infra red radiant light which travels through the air and heats nearby objects Variable Heat Output The non thermostat heaters can be adjusted to one of three alternative heat settings to provide user comfort The thermostat heaters can be adjusted to the desired heat setting to per mit economical use In the event of a power Accessories outage the heater can be operated manu ally on high or low e Piezo Electric Ignition The heater can be started and operated without matches or other external means The pilotis ignited by a spark created from the piezo ignitor when the control knob is depressed and turned to the PILOT position Oxygen Depletion System The heater is designed to shut off if the oxygen level in the room falls to an unacceptable level The following accessories are available from DESA International 1 Fan Kit GA2100A The fan accessory pro vides better heat distribution in the room Figure 1 Optional Fan Kit 2 Floor Mounting Stand GA4000 3 plaque models and GA4010 5 plaque models The floor stand allows the heater to be installed away from a wall Figure 2 Optional Floor Mounting Stand For accessories contact authorized dealers of this product If they are unable to supply accessory parts call DESA International
26. st electrode to be sure that it is not cracked If the porcelain is cracked replace the ignitor electrode pressed when attempting to ignite the pi lot If necessary instruct the customer on proper operating procedure see Owner s Operation and Installation Manual for heater in question above steps have been taken replace the control valve assembly Be sure to turn off the manual shut off valve before begin ning replacement of the control valve Ignitor Electrode 14 VENT FREE GAS HEATER Problem Ignitor sparks but pilot will not light 3 Possible Causes 1 Gas supply is turned off and or manual shut off valve is closed 2 Air in pilot line 3 Dirty pilot assembly 4 Insufficient gas supply pressure Procedures 1 Check to be sure that the gas supply to the heater is turned on Be sure the manual shut off valve is open 2 Be sure thatthe pilot line has been purged for sufficient time to remove air from the line The pilot line can be purged by turning the 4 control knob to the PILOT position and fully depressing the knob Ignition should be attempted every 30 seconds until a correct pilot flame is established See Owner s Manual for correct ignition proce dure SERVICE MANUAL Check the pilot assembly for dirt cobwebs or other restrictions Be sure the heater has been turned off First remove the wire clip from the bi metal strip located on the pilot tube see Figure 14 Re
27. tain you read and understand all Warnings Keep the Owner s Manual for reference It is your guide to safe and proper operation of this heater 1 Use only propane gas for models designated as propane 2 Use only natural gas for models designated as natural 3 If using propane model do not place propane supply tank inside any structure The propane supply tank must be located outdoors 4 If you smell gas Shut off gas supply e Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building e Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions e If you cannot reach your gas supplier call the fire department 5 Never install the heater in sleeping quarters a mobile home or a recreational vehicle e where curtains furniture clothing or other flammable objects are less than 36 inches from the front top or sides of the heater e as a fireplace insert in high traffic areas e in windy or drafty areas 6 Always run heater at LOW THERMOSTAT MEDIUM or HIGH locked positions Never set control knob between locked positions Poor combustion and higher levels of carbon monoxide may result 7 Open window to admit fresh outside air when using heater Open window one 1 or two 2 inches When used without fresh outside air heater may give off carbon monoxide gas 8 Never run heater in small closed room Open door into next roo
28. ternal regulators should be installed with the vent pointing down as shown in Figure 9 Some regulators have a so called drip lip surround ing the vents which acts as a shield for the recessed vent opening This lip makes it more difficult for freezing rain or sleet to plug a vent that has been installed pointing down Older style vents may not have the lip and are far less resistant to freeze up problems see Figure 10 A regulator with the drip lip design installed outdoors does not require additional protection if the vent is pointing down unless subjected to upward splatter from rain AG Older regulators with the non drip lip vent con struction require additional protection such as a hood cover encasement etc The external regulator should be installed high enough above ground level at least 18 inches so that rain splatter does not block or freeze the vent Extra protection for the vent may be needed in areas where there is heavy snow fall Be sure the external regulator is installed in accordance with NFPA No 58 and any other applicable local regulations as well as the manufacturer s instructions No Drip Lip Figure 10 Regulator Vent Drip Lips f Valve With 1 8 NPT Tap 10 VENT FREE Moa TEST PROCEDURES Testing Gas Supply Line Connections GAS HEATER SERVICE A WARNING All gas piping and connec tions must be tested for leaks
29. tion Of Main Burner ooocccnnccinccconccnonnnoncnnnnn conc ncnnccnnn cnn cnn cn ran ca nn nccnncn Combustion Problems Backfiring During Operation eceeceseseeeeeseeeeeeeeeeeeeseeeeeaeeeeeeeeseeseaeeeeeseaeeseeeeeaeees Smoke or Unwanted Odors ceccceeseeeeeeeeeeeeeeeeeeeeaeeeeaeecaeeeeaeeeeeseaeeeeeeseneeseeeeeaeess MANUAL Ma SAFETY INFORMATION VENT FREE GAS HEATER SERVICE MANUAL Safety Requirements This service manual is intended for use by individuals without those skills can result in individuals with adequate electrical and me personal injury as well as property damage chanical skills Attempts to repair this heater by WARNINGS A es IMPORTANT Read the Owner s Manual carefully and completely before trying to assemble operate or service this heater Improper use of this heater can cause serious injury or death from fire explosion electrical shock electrocution and carbon monoxide poisoning A DANGER Carbon monoxide poisoning may lead to death 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 serviced Some people such as pregnant women persons with heart or lung disease persons with anemia those under the influence of alcohol and those at high altitudes are more affected by carbon monoxide than others Make cer
30. urner Assembly vecinita ee Al deere e e A vile en aN E liens arent eee Gontrol Valve sce sesh ae ie cote aah eerie A areas Gas Regulator vio eee EG Oxygen Depletion System ooooncocinnccnncccoccconccnnncnonanonncnnncnnnnc nana n rn nc anar cnn carac nrncnnnncns Section 4 Tools and Equipment ceccceecceesceeeeeteneeeeeeeeeeseeeeeeeeseeeeseeseaeesneeeeneeeeees Section 5 Installation Gass LY Pex asics ita iO ee ae edo Le Location Safety Precautions oooooncccinccionocacccnocnnonncnnnn conc nnnnncnncn ran can ran cnn nn Gas Supply Installation cccccccceeseceesneeeeeneeeseeeeeeeeeeeeecaeeeeseeeeeseneeeseneeeesseeessnsess Propane Installation ts iiitr died eel eli a a E eaat External Regulatoria li ae Section 6 Test Procedures Testing Gas Supply Line Connections ccccccceeeeceeeeeeeeeeeeeeeeseeeeseeeeesseeessaees Testing Heater Gas Connections siie er E R E PE Gortrecting Leaks cui darla dc Testing Control Valve and Thermocouple cccceeseeeseeeeeeeeeeeeeneeeeeeeeeeseaeeeeetsaes Section 7 SpecificatONS ixta iii Section 8 Troubleshooting Ignition Problems No Spark wayside ai Ignitor Sparks But Pilot Will Not Light oooonicnnnnninncnnnonnnnnnncnnccnncconnccnnncnrnccnanccnno Pilot Lights But Will Not Stay Lit 0 0 ec eececeeeeeeeeneeeeeeeeeeeeeeeeseeeeaeeseeeeaeeseeeesas Main Burner Does Not Light pilot stays lit 0 ee eee eeeseeeeesneeeeeneeereneeeernneeeee Delayed Igni
Download Pdf Manuals
Related Search