Winchester LP 347 Installation Guide
Contents
1. A CAUTION The gas line pressure switch will cause the furnace to lock out if the gas supply pressure drops below 6 w c The igni tion control will display a fault code 7 and will reset after one hour The gas supply shall be shut off prior to disconnecting the electrical power before proceeding with the conversion 1 Shut off gas supply at shutoff valve upstream of the furnace or at meter as required 2 Disconnect gas supply piping from gas valve at furnace 3 On 33 amp 40 series Remove the upper access door On 40 series only 90 AFUE units remove the burner box cover 4 On 33 amp 40 series Carefully remove the wires from the gas valve and note their location so they may be properly replaced Remove the screws that hold the manifold to the manifold brackets and slide the manifold off the burners On 40 series only 90 AFUE units the manifold is retained by two screws at the bottom and hooks in at the top of the burner box 5 Remove the main burner orifices from the manifold and retain for future use 6 Install the propane main burner orifices in the manifold and tighten them After installing a propane orifice in each loca tion any leftover orifices may be discarded If a stainless steel burner kit was purchased refer to the kit instructions for the burner change out 7 Reinstall the manifold in the assembly by reversing the removal process 11 12 14 152. 16 17 18 19 Disconnect the purple wire from the flame sensor Using the wire harness supplied with kit connect the pur ple wire from the flame sensor into the insulated male con nector connect the two 1 4 insulated terminals to the pressure switch and connect the remaining insulated ter minal to the flame sensor Convert the gas valve for LP propane gas operation by following the instructions and using the components sup plied in the envelope These instructions cover both single stage and two stage units Apply the label supplied in the kit to the gas valve to show that it has been converted Reattach the manifold and orifices to the furnace making sure that the orifices are pointing properly down the center of the burners Reconnect the electrical wires to the gas valve using the wiring diagram as a guide Reconnect the gas supply piping to the gas valve and insure that all gas connections are tight Turn on gas supply to furnace and check all gas connec tions with suitable leak detector Install the propane gas conversion label as described in the LABELS section of this instruction Refer to the unit installation instructions to complete the installation before continuing with these procedures Johnson Controls Unitary Products NOX SCREEN REMOVAL Lo NOx 80 Models Only 1 2 Make sure that the electrical power to the unit is turned off and that the gas supply is turned off at the
3. The inlet gas pressure operating range table specifies what the minimum and maximum gas line pressures must be for the furnace to operate safely The gas line pressure MUST BE e 11 W C 2 74 kPA for Propane LP Gas in order to obtain the BTU input specified on the rating plate and or the nominal manifold pressure specified in these instructions and on the rating plate ADJUSTMENT OF MANIFOLD GAS PRESSURE FOR 90 FURNACES 40 MODELS Manifold gas pressure may be measured by two different proce dures It may be measured with the burner box cover in place or it may be measured with the burner box cover removed Follow the appropriate section in the instructions below Refer to Fig ure 1 or 2 for a drawing of the locations of the pressure ports on the gas valve Turn gas off at the ball valve or gas cock on gas supply line before the gas valve Find the pressure ports on the gas valve marked OUT P and IN P 1 The manifold pressure must be taken at the port marked OUT P 2 The inlet gas line pressure must be taken at the port marked IN P 3 Using a 3 32 2 4 mm Allen wrench loosen the setscrew by turning it 1 turn counter clockwise DO NOT REMOVE THE SET SCREW FROM THE PRESSURE PORT Read the inlet gas pressure using either of the two methods below Reading the gas pressure with the burner box cover in place 1 Disconnect the pressure reference hose from the right side of the burner box Usin
4. Do not use this furnace with butane gas Incorrect gas orifices or a furnace that has been improperly converted will create an extremely dangerous condition resulting in premature heat exchanger failure excessive sooting high levels of carbon monoxide personal injury property damage a fire hazard and or death High altitude and propane LP conversions are required in order for the appliance to satisfactory meet the application An authorized distributor or dealer must make all gas con versions In Canada a certified conversion station or other qualified agency using factory specified and or approved parts must perform the conversion The installer must take every precaution to insure that the furnace has been converted to the proper gas orifice size when the furnace is installed Do not attempt to drill out any orifices to obtain the proper orifice size Drilling out a gas orifice will cause misalignment of the burner flames causing premature heat exchanger burnout high levels of carbon monoxide excessive sooting a fire hazard personal injury property damage and or death Johnson Controls Unitary Products 247585 UAI F 0210 GAS ORIFICE CONVERSION FOR PROPANE LP This furnace is constructed at the factory for natural gas fired operation but may be converted to operate on propane LP gas by using a factory supplied LP conversion kit Follow these instructions when converting the furnace IMPORTANT
5. Gas Heating Value Teang Vale soo cp 41 s8 First Stage Manifold Pressures kpa Altitude m 0 243 7 2438 2742 2 743 3048 Gas Heating Value An overpressure protection device such as a pressure reg ulator must be installed in the gas piping system upstream of the furnace and must act to limit the downstream pres sure to the gas valve so it does not exceed 0 5 PSI 14 w c 3 48 kPa Pressures exceeding 0 5 PSI 14 w c 3 48 kPa at the gas valve will cause damage to the gas valve resulting in a fire or explosion or cause damage to the furnace or some of its components that will result in property damage and loss of life OUTLET PRESSURE PORT VENT PORT OUTLET BOSS INLET f MAIN REGULATOR PRESSURE ADJUSTMENT PORT ON OFF SWITCH Shown in ON position FIGURE 2 Single Stage Gas Valve TWO STAGE GAS VALVE MODELS 40 MODELS NOTICE The regulated outlet pressures both low and high have been calibrated at the factory Additional pressure adjust ment should not be necessary If adjustment is necessary set to the following specifications After adjustment check for gas leakage 1 Refer to Figure 2 for location of pressure regulator adjust ment cap and adjustment screws on main gas valve 2 Turn gas and electrical supplies on and follow the operat ing instructions to place the unit back in operation Johnson Controls Unitary Products 247585 UAI
6. 960 x 3600 78 666 90 2500 x 1 x 0 960 x 3600 80 000 00 Natural Gas Propane Gas BTU SCF 1030 BTU SCF 2500 In Canada you will use the following formula to calculate the furnace input if you are using a cubic foot gas meter For Natural Gas multiply the Heat content of the gas MJ m or Default 38 4 times 2 cubic ft of gas x 0 028 to convert from cubic feet to cubic meters measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 2 cubic ft 0 056 m of gas from the gas meter For Propane LP Gas multiply the Heat content of the gas MJ m or Default 93 13 times 1 cu ft of gas x 0 028 to convert from cubic feet to cubic meters measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 1 cubic ft 0 028 m of gas from the gas meter The formula for metric input calculation using a cubic foot gas meter MJ m x 2 cu ft x 0 028 x 0 960 x 3600 amp MJ H x 0 2777 kW 7 3412 14 Seconds it took to measure the 2 cu ft of gas NATURAL GAS INPUT CALCULATION EXAMPLE 38 4 x 2 x 0 028 x 0 960 x 3600 90 5 82 12 x 0 2777 22 80 X 3412 14 Natural Gas BTU SCF 1030 38 4 MJ m PROPANE LP GAS INPUT CALCULATION EXAMPLE So TS tO e 8344 x 0 2777 2317 x 3412 14 Propane Gas BTU SCF 2500 93 13 Mu m In Canada use the following formula to cal
7. been calibrated at the factory Additional pressure adjust ment should not be necessary If adjustment is necessary set to the following specifications After adjustment check for gas leakage 1 Refer to Figure 1 for location of pressure regulator adjust ment cap and adjustment screws on main gas valve 2 Turn gas and electrical supplies on and follow the operat ing instructions to place the unit back in operation 3 Adjust manifold pressure by adjusting gas valve regulator screw for the appropriate gas per the following SINGLE STAGE GAS VALVE MODELS 1 Refer to Figure 1 or 2 for location of pressure regulator adjustment cap and adjustment screw on main gas valve 2 Turn gas and electrical supplies on and follow the operat ing instructions to place the unit back in operation 3 Adjust manifold pressure by adjusting gas valve regulator screw for the appropriate gas per the following table TABLE 2 Nominal Manifold Pressure Two Stage Valve High Fire or Single Stage Valve Single Second Stage Manifold Pressures in wc Altitude feet 0 7999 8000 8999 9000 9999 Gas Heating Value Single Second Stage Manifold Pressures kpa Altitude m 0 2437 2438 2742 2743 3048 Gas Heating Value Feaing Vate ss a P 244 200 Johnson Controls Unitary Products TABLE 3 Nominal Manifold Pressure Two Stage Valve Low Fire First Stage Manifold Pressures in wc Altitude feet 0 7999 8000 8999 9000 9999
8. conforms to the National Fuel Gas code ANSI 2223 1 U S or CAN B149 1 or 2 Canada and acts to limit the downstream pressure to value that does not exceed 0 5 PSI 14 w c must be installed in the gas piping system upstream of the furnace Failure to do so may result in a fire or explosion or cause damage to the furnace or some of its components J 7 J J J J J J J FURNACE CONVERSION Reconnect the wires to the proper terminals on the gas valve On 33 amp 40 series When installing gas piping on 80 amp 95 AFUE units insert tapped gas pipe nipple supplied with kit into inlet fitting of gas valve If using the right side cabinet knock out the nipple can either be installed before or after making the u bend Ensure that the 1 8 inch tapped hole in the gas pipe nipple is located in the horizontal posi tion On 40 series only 90 AFUE units install a field provided elbow into the inlet fitting on the gas valve and then install the tapped gas pipe nipple Ensure that the 1 8 inch tapped hose in the gas pipe nipple is located in the horizontal posi tion INCORRECT CORRECT VERTICAL HORIZONTAL FIGURE 1 Tapped Gas Pipe Nipple 10 Install thread the gas line pressure switch supplied with kit into the 1 8 NPT tapped hole in nipple applying pipe dope to the switch fitting prior to installation Tighten the switch making sure the connection does not leak NOTICE
9. must be for the furnace to operate safely The gas line pressure MUST BE a minimum of e 7 WC 1 74 KPA for Natural Gas e 11 W C 2 74 kPA for Propane LP Gas in order to obtain the BTU input specified on the rating plate and or the nominal manifold pressure specified in these instructions and on the rating plate 2 Once the correct gas inlet pressure has been established see Table 1 turn the gas valve to OFF and turn the electri cal supply switch to OFF then remove the flexible tubing from the gas valve pressure tap and tighten the pressure tap plug using the 3 32 2 4 mm allen wrench 3 Turn the electrical and gas supplies back on and with the burners in operation check for gas leakage around the gas valve pressure port for leakage using an approved non cor rosive gas leak detection fluid or other non flammable leak detection methods Read the manifold gas pressure Connect the positive side of the manometer to the adapter pre viously installed in the OUT P Tap on the gas valve Do not con nect any tubing to the negative side of the manometer as it will reference atmospheric pressure Refer to Figures 3 and 4 for connection details IMPORTANT The cap for the pressure regulator must be removed entirely to gain access to the adjustment screw Loosening or tight ening the cap does not adjust the flow of gas NOTICE The regulated outlet pressures both low and high have
10. over fire conal tion A high manifold pressure will cause an over fire condi tion which could cause premature heat exchanger failure If the manifold pressure is too low sooting and eventual clog ging of the heat exchanger could occur Be sure that gas valve regulator cap is in place and burner box to gas valve pressure reference hose is connected HIGH STAGE REGULATOR ADJUSTMENT OUTLET PRESSURE D o a CP i N O a ll f AV 7 N 7 a Di PRESSURE PORT LOW STAGE REGULATOR SWITCH ADJUSTMENT FIGURE 3 Two Stage Gas Valve 247585 UAI F 0210 CALCULATING THE FURNACE INPUT NATURAL GAS NOTICE Burner orifices are sized to provide proper input rate using natural gas with a heating value of 1030 BTU Ft If the heating value of your gas is significantly different it may be necessary to replace the orifices 1 Turn off all other gas appliances connected to the gas meter 2 At the gas meter measure the time with a stop watch it takes to use 2 cubic ft 0 0566 m of gas 3 Calculate the furnace input by using one of the following equations CALCULATING THE FURNACE INPUT PROPANE GAS NOTICE Burner orifices are sized to provide the proper input rate using propane gas with a heating value of 2500 BTU Ft If the heating value of your gas is significantly different it may be necessary to replace the orifices with different size ori fices Follow the pr
11. ACCESSORY KIT INSTALLATION INSTRUCTIONS PROPANE CONVERSION INDUCED COMBUSTION FURNACES 1NP0347 FOR USE WITH 90 MODELS GF9S GY9S GM9S PS9 FL9S FC9S PT9 FL9T FC9T GM9T PV9 FL9V FC9V GM9V TG9S GGIS TM9T TM9V TM9X MG9S FOR USE WITH 80 MODELS GY8S GM8S GR8S PS8 FL8S FC8S PT8 FL8T FC8T GM8T PV8 FL8V FC8V GM8V LF8S LY8S LM8S LL8S LC8S LL8V LC8V LM8V TG 8 L S GG 8 L S TM 8 L T TM 8 L V TM 8 L X YG8S This conversion kit shall be installed by a qualified service agency in accordance with these instructions and all applicable codes and requirements of the authority having jurisdiction If the information in these instructions is not followed exactly a fire an explosion or production of carbon monoxide may result causing property damage personal injury or loss of life The qualified service agency is responsible for the proper installation of this kit The installation is not proper and complete until the operation of the converted appliance is checked as specified in these instructions supplied with the kit A CAUTION The conversion of new certified central heating gas appliances must conform to directions outlined in this instruction Installation must be made in accordance with American National Standard National Fuel Gas Code ANSI 2223 1 latest edition unless superseded by local codes For Canadian installations the conversion shall be carried out in accordance with the re
12. F 0210 Adjust manifold pressure by adjusting gas valve regulator screw for the appropriate gas per the following IMPORTANT If gas valve regulator is turned in clockwise manifold pres sure is increased If screw is turned out counterclockwise manifold pressure will decrease After the manifold pressure has been adjusted re calculate the furnace input to make sure you have not exceeded the specified input on the rating plate Refer to CALCULAT ING THE FURNACE INPUT NATURAL GAS Refer to calculations on Page 6 Once the correct BTU kW input has been established turn the gas valve to OFF and turn the electrical supply switch to OFF then remove the flexible tubing and fittings from the gas valve pressure tap and the pressure refer ence hose from the right side of the burner box and tighten the pressure tap plug using the 3 32 2 4 mm Allen wrench For 90 models replace the burner box front cover if it was removed and place the pressure reference hose back on the gas valve Turn the electrical and gas supplies back on and with the burners in operation check for gas leakage around the gas valve pressure port for leakage using an approved gas detector a non corrosive leak detection fluid or other leak detection methods AWARNING The manifold pressure must be checked with the screw off cap for the gas valve pressure regulator in place If not the manifold pressure setting could result in an
13. GAS PRESSURE FOR 80 FURNACES 40 OR 33 80 MOD ELS OR 33 95 MODELS Inlet and manifold gas pressure may be measured by connect ing the U tube manometer to the gas valve with a piece of tub ing Follow the appropriate section in the instructions below Refer to Figure 1 for a drawing of the locations of the pressure ports on the gas valve Turn gas off at the ball valve or gas cock on gas supply line before the gas valve Find the pressure ports on the gas valve marked Out P and In P 1 The manifold pressure must be taken at the port marked OUT P 2 The gas line pressure must be taken at the port marked IN P 3 Using a 3 32 2 4 mm Allen wrench loosen the set screw by turning it 1 turn counter clockwise DO NOT REMOVE THE SET SCREW FROM THE PRESSURE PORT Read the inlet gas pressure Connect the positive side of the manometer to the IN P Tap on the gas valve Do not connect any tubing to the negative side of the manometer as it will reference atmospheric pressure Refer to Figure 1 for connection details 1 Turn gas and electrical supplies on and follow the operat ing instructions to place the unit back in operation TABLE 1 Inlet Gas Pressure Range Lo Natural Gas Propane LP 4 5 W C 1 12 kPa 8 0 WC 1 99 kPa 10 5 WC 2 61 kPa 13 0 3 24 kPa WC IMPORTANT The inlet gas pressure operating range table specifies what the minimum and maximum gas line pressures
14. culate the furnace input if you are using a gas meter that measures cubic meters For Natural Gas multiply the Heat content of the gas MJ m or Default 38 4 times 0 10 m of gas measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 0 10 m of gas from the gas meter For Propane LP Gas multiply the Heat content of the gas MJ m or Default 93 13 times 0 10 m of gas measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to mea sure 0 10 m of gas from the gas meter The formula for metric input calculation using a cubic foot gas meter MJ m x m x 0 960 x 3600 Seconds it took to measure the 0 10 m of gas MJ H x 0 2777 kW X 3412 14 38 4 x 0 1 x 0 960 x 3600 82 94 x 0 2777 23 03 x 3412 14 78 581 60 Natural Gas BTU SCF 1030 38 4 MJ m PROPANE LP GAS INPUT CALCULATION EXAMPLE 93 13 x 0 1 _ x 3600 83 17 x 0 2777 23 09 x 3412 14 78 805 20 Propane Gas BTU SCF 2500 93 13 MJ m DO NOT ADJUST the manifold pressure regulator if the actual input is equal to or within 8 less than the furnace input specified on the rating plate or if the furnace rise is above the specified rise range on the rating plate If the actual input is significantly higher than the furnace input specified on the rating plate then replace the gas orifices with the ga
15. equirements Understand and pay particular attention to the signal words This instruction covers the conversion of this unit when it is equipped with a White Rodgers gas valve The installation PANGE Ry WARNING OAM instruction supplied with the unit is to be used for all other DANGER indicates an imminently hazardous situation which if aspects of the installation not avoided will result in death or serious injury WARNING indicates a potentially hazardous situation which if AWARNING not avoided could result in death or serious injury CAUTION indicates a potentially hazardous situation which if Improper installation adjustment service or maintenance not avoided may result in minor or moderate injury It is also can cause injury or property damage therefore only a qual used to alert against unsafe practices and hazards involving ified installer or qualified service personnel should perform only property damage this conversion Johnson Controls Unitary Products 247585 UAI F 0210 247585 UAI F 0210 CONTENTS OF KIT DESCRIPTION Gas Line Pressure Switch Tapped Gas Pipe Nipple Propane Gas Orifice 55 nstallation Instructions Valve Conversion Kit 247585 abel Bar Code abel Conversion abel Carton abel Conversion Rating Plate 11931 i 7 a xz 7614 nsns a a RA 255426 255417 AE AWARNING An overpressure protection device such as a pressure reg ulator which
16. g a tee fitting and a short piece of hose connect the negative side of the manometer to the burner box as described below 2 Remove one end the 5 16 7 94 mm ID flexible tubing over the pressure port on the burner box 3 Insert the end of the 5 16 7 94 mm tubing that has the 1 8 3 175 mm adapter at the end of the tube in to the 1 8 3 175 mm tee 4 Connect the 1 8 3 175 mm tee to the burner box adapter and to the negative side of a U tube manometer or digital pressure measuring equipment with 2 1 8 3 175 mm tubes 5 Use the 5 16 7 94 mm x 1 8 3 175 mm reducing cou pling and a 4 101 6 mm piece of 1 8 3 175 mm tubing to connect the positive side of the manometer to the gas valve pressure reference port Refer to Figures 3 and 4 for connection details 247585 UAI F 0210 Reading the gas pressure with the burner box cover removed Remove the screws securing the burner box front cover plate Remove the cover The gasket and may stick in place Connect the positive side of the manometer to the gas valve as described in E above There will be no second connec tion to the manometer as it will reference atmospheric pres sure Refer to Figures 3 and 4 for connection details IMPORTANT The cap for the pressure regulator must be removed entirely to gain access to the adjustment screw Loosening or tight ening the cap does not adjust the flow of gas ADJUSTMENT OF MANIFOLD
17. ocedure below to calculate the furnace input 1 Turn off all gas appliances connected to the gas meter 2 Start the furnace 3 Use a stop watch to measure the time it takes for the fur nace to burn 1 cubic ft of gas 4 Calculate the furnace input by using one of the following equations Johnson Controls Unitary Products 247585 UAI F 0210 In the USA use the following formula to calculate the furnace input For natural gas multiply the heat content of the gas BTU SCF or Default 1030 BTU SCF 38 4 MJ m times 2 cubic ft 0 056 m of gas measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time In seconds it took to measure 2 cubic ft 0 056 m of gas from the gas meter For propane LP gas multiply the heat content of the gas BTU SCF or Default 2500 BTU SCF 93 13 MJ m times 1 cubic ft 0 028 m of gas measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time In seconds it took to measure 1 cubic ft 0 028 m of gas from the gas meter The formula for US input calculation using a cubic foot gas meter BTU ft x 2 cu ft x 0 960 x 3600 p BTU H BTU ft x 1 cu ft x 0 960 x 3600 M Seconds it took to measure the 2 cu ft of gas Seconds it took to measure the 1 cu ft of gas NATURAL GAS INPUT CALCULATION PROPANE LP GAS INPUT CALCULATION EXAMPLE EXAMPLE 1030 x 2 x 0
18. om the shipping box Check the natural gas to propane box If in Canada check the appropriate box for respective conversion sta tion Place the conversion rating plate label 255424 as close to the rating plate as possible On the gas appliance conversion label write the following a Kit number located on the outside of the kit box b Stamp or write in the name of the organization making conversion address city state month and year Remove label backing and affix label adjacent to the rating plate 247585 UAI F 0210 Supersedes 247585 UAI D 0708 247585 UAI E 0909 Johnson Controls Unitary Products 5005 York Drive Norman OK 73069
19. quire ments of the Provincial authorities having jurisdiction and in accordance with the CAN1 B149 1 and 2 installation codes The manufacturer accepts no responsibility for malfunctions due to improper conversions A CAUTION Lo NOx furnaces requiring propane LP gas must have the NOx screens removed prior to operation Failure to do so may result in operational problems and or reduced heat exchanger life Follow the instructions below for removal of the NOx screens GENERAL This kit is intended for the conversion of new equipment only IMPORTANT from natural gas to propane gas operation ANOTICE For the 130 000 BTU 33 series only Use a 56 orifice pro pane Kit S1 1NP0501 is needed These instructions are for the use of qualified individuals specially trained experienced and certified in the installation of this tyoe of equipment and related systems components Installation and service personnel are required by some states to be licensed Persons not qualified shall not install this equipment nor interpret these instructions All unit installations above 2 000 ft 610 m must be field Thisieaenict y alert symbol When you see this symbol derated as required by the National Fuel Gas Code ANSI A on labels or in manuals be alert to the potential for per 2223 1 latest edition or in Canada CAN CGA B149 1 or 2 sonal injury and all other applicable local codes and utility r
20. s orifices of the proper size for the type of gas you are using For altitudes above 2 000 ft 610 m the furnace input MUST BE DERATED Refer to the GAS CONVERSION FOR PROPANE LP AND HIGH ALTITUDES IN SECTION IV for information on high altitude conversions Johnson Controls Unitary Products 7 WITH BURNER BOX COVER IN PLACE WITH BURNER BOX COVER REMOVED BURNER BOX PRESSURE REFERENCE o HOSE TEE E FITTING BURNER BOX WITH COVER OUTLET PRESSURE TAP GAS VALVE 3 5 IN WATER COLUMN GAS PRESSURE SHOWN U TUBE MANOMETER OUTLET PRESSURE TAP 1 4 TUBING MAINIFOLD FLAME SENSOR 3 5 IN WATER COLUMN 2 GAS PRESSURE SHOWN 3 MAINIFOLD PIPE 1 4 TUBING SENSOR BURNERS GAS VALVE 3 5 IN WATER COLUMN GAS PRESSURE SHOWN QubuwN O NwauMm U TUBE MANOMETER FIGURE 6 Reading Gas Pressure 95 33 Models Subject to change without notice Published in U S A Copyright 2010 by Johnson Controls Inc All rights reserved BURNER BOX PRESSURE REFERENCE HOSE not used BURNER BOX WITH COVER REMOVED OUTLET PRESSURE TAP gt GAS VALVE J 3 5 IN WATER i U TUBE MANOMETER COLUMN GAS PRESSURE SHOWN A CAUTION Be sure to relight any gas appliances that were turned off at the start of this input check LABELS l Remove conversion rating plate label fr
21. shutoff valve Remove the blower compartment and burner compartment access doors Disconnect the gas supply piping at the union to permit removal of the entire burner and gas control assembly from the vestibule panel Use the wrench boss on the gas valve when removing or installing this piping Unplug the ignitor from the wire harness Disconnect the flame sensor wires located on top of the air shield Unplug the gas valve from the wiring harness Remove the ignitor and ignitor bracket Handle the ignitor very carefully since it is fragile and easily broken Remove the screws holding the burner assembly to the vestibule panel It may be necessary to remove the rollout switch bracket s to gain access to one or more of these SCrews Remove the burner assembly It should be possible to swing the burner assembly out of the way without discon necting the remaining wires With the burner assembly out of the way simply slide the NOx screens out of the heat exchanger tubes and discard the screens Replace all components in reverse order Reconnect all wiring TESTS AND ADJUSTMENTS PROPANE AND HIGH ALTITUDE CONVERSION KITS lt is very important to choose the correct kit and or gas ori fices for the altitude and the type of gas for which the fur nace is being installed Only use natural gas in furnaces designed for natural gas Only use propane LP gas for furnaces that have been properly converted to use propane LP gas
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