SUBURBAN GAS FURNACES
Contents
1. Figure 3 Figure 2 TIE DOWN SCREW FURNACE TO CABINET OUTSIDE SKIN CAULK ALONG THE EDGE OF THE CUTOUT ALL THE WAY AROUND ANCHOR FURNACE CABINET TO COACH FLOOR 2 PLACES AS ILLUSTRATED BACK OF CABINET MUST BUTT AGAINST THIS EDGE OF THE FRAME DOOR FRAKE CAULK BEHIND VENT CAP AS SHOWN TO SEAL BETWEEN EXHAUST AND INTAKE AND TO PREVENT MOISTURE INSIDE FURNACE COKPARTMENT APPLY CAULKING GENEROUSLY AROUND PERIMETER OF VENT AND ACROSS CENTER AS SHOWN CENTER PUTTY STRIP IS ESSENTIAL ELECTRICAL CONNECTION GAS CONNECTION 2 SCREWS AIR INTAKE TUBE WITH GASKET SUPPLIED SECURE FRAME 4 SCREWS GUTER PANEL WITH SCREWS DOOR MOUNTING 046 PLACES FURNACE ACCESS DOOR VENT CAP amp EXHAUST TUBE Figure 4 5 ELECTRODE MARKED CENTERLINE OF LANCE BURNER FLASHLIGHT L ner sine Buener ee FRONT END BURNER ie BURNER 308 FROM BACK OF LANCE SPARK GAP GVER TOP OF BURNER LANCE VENTURI TUBE Figure 5 GROUNDING TERMINAL com VALVE SWITCH BL THERMOSTAT R 12 Vide THERMOSTAT Y 12 BL Salt Sw sv VALVE TSTAT Sw 12 VOLTS DC NOTE IF ANY OF THE ORIGINAL WIRES 14 AWG 105 C THERMOPLASTIC ALL WIRES ARE 18 AWG UNLESS OTHERWISE SPECIFIED CAUTION2. DIFFERENT OR OTHER LIABILITY IN CONNECTION WITH THE SALE OF THIS SUBURBAN PRODUCT This warranty gives you specific legal rights and you may also have other rights which vary from state to state IF YOU HAVE A PRODUCT PROBLEM FIRST If your RV has its original furnace and is still under the RV manufacturer s warranty follow the steps described in your RV owner s manual SECOND Contact a conveniently located recommended Suburban Service Center Describe to them the nature of your problem make an appointment if necessary and provide for delivery of the furnace to the selected service center THIRD For the location of the nearest service center refer to the listing provided or contact Suburban Manufacturing Company ore Customer Service Department For future reference you should record the following information Post Office Box 399 Dayton Tennessee 37321 MODEL NUMBER 423 775 2131 Ext 1 SERIAL NUMBER STOCK NUMBER DATE OF PURCHASE Part Number 203560 2 28 04
3. DO NOT WITH THE APPLIANCE MUST BE REPLACED IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURE RATING OF AT LEAST 105 16 30 200 C RADIX SIL A BLEND 18 AWG wiRE CAUSE COMPONENT DAMAGE AND AS SUPPLIED CBIELECTRIC HIGH VOLTAGE TEST THIS UNIT AFTER INSTALLATION TO DO 50 MAY VOIDS WARRANTY OF FURNACE UNIT 100 FIRE CHECKED 340501 TO CLEAN THE CHAMBER THE FURNACE MUST REMOVED FROM THE CARBINE T AND THE MANIFOLD BLOWER ASSEMBLY AND CONTROL REMOVED LEAVING THE CHAMBER ONLY AS SHOWN USING COMPRESSED AIR BLOW THROUGH THE CHAMBER AS SHOWN BY ARROWS TO REMOVE SOOT OR LUOSE DEBRIS Figure 7 5 Figure 6 8 O O NDUNA 12 13 14 15 16 17 18 19 20 21 22 23 Figure 9 10 REPLACEMENT PARTS LIST Only factory authorized parts are to be used Do not attompt to rep ir defective When ordering repair parts from your dealer a Suburban Service Center or distributor always give the following information 1 Part Number Not Item 2 Part Description 3 Model and Serial Number of furnace 4 Number of Parts Required Part Description Numbor No Description Number Cabinet FrontAssembly 101242 31 Vent Cap and Exhaust Tube Assembly 260231 Thermostat F
4. INSTRUCTIONS FOR MODELS 5 20 SF 25 5 30 SF 35 SUBURBAN MANUFACTURING COMPANY Post Office Box 399 Dayton Tennessee 37321 The design of the furnace has been listed for installation in recreational vehicles only In order for the furnace to operate in conformity with generally accepted safety regulations the installation instructions must be followed Failure to comply with the installation instructions will void the warranty on the furnace and any responsibility on the part of Suburban Manufacturing Company The furnace was inspected before it teft the factory If any parts are found to be damaged do not install the furnace Immediately contact the transportation company and file a claim FOR YOUR SAFETY WHAT TO DO IF YOU SMELL GAS Extinguish any open flame Evacuate all persons from the vehicle e Shut off the gas supply at the gas container or source not touch any electrical switch or use any phone or radio in the vehicle not start the vehicle s engine or electric generator e Contact the nearest gas supplier or qualified service technician for repairs If you cannot reach a gas supplier or qualified service technician contact the nearest fire department Do not turn on the gas supply until the gas leak s has been repaired This book contains instructions covering the operation and maintenance of your furnace Keep with unit at all times Should you require furthe
5. furnace access door in place and insure a tight seal It may be necessary to build a wood or metal frame around the opening in order to provide adequate strength for securing door CAUTION The screws provided with the door may not be of sufficient length and size for all applications and it may be necessary for the installer to substitute screws in order to adequately secure the furnace access door 11 Install vent assembly See instructions for installing vent Exhaust and Intake Tube Left Right Modei Front Side Side Bottom Back NOTE 0 MEANS TO SPACER BUMPS CLEARANCE FROM DUCTS TO COMBUSTIBLE MATERIAL 1 4 See Figure 3 TABLE 2 INSTALLING VENT ASSEMBLY The vent outlet must be installed so it is in the same atmospheric pressure zone as the combustion air intake The exhaust and intake tubes must be installed from the outside pass through the RV skin and slide onto the furnace exhaust and intake WARNING Do notalter the vent assembly supplied with this furnace Any modifications will result in improper installation which could cause unsafe furnace operation CAUTION Combustion air must not be drawn from the living area All air for combustion must be drawn from the outside atmosphere exhaust gases must be vented to the outside atmosphere never inside the RV Therefore itis essential to insure that the vent cap and tube assemblies are properly installed 1 Apply caulking to RV skin behind ve
6. A 161154 32 Tube Assembly Intake Vent 2 061248 Screw 10 x 3 4 2 121853 33 Screw 8 x 1 2 8 2 120615 Screw 8 x 3 8 2 120158 34 Combustion Air Housing Assembly Front Half 390852 Cabinet Assembly SF 20 SF 25 SF 30 only 101889 35 Screw 8 18 x 2 1 4 4 Required 2 121929 Cabinet Assembly SF 35 only 101893 36 Screw 6 19 1 2 7 Required 121928 Cover Duct 050733 37 Combustion Air Housing Rear Half 5 20 2 390849 Collar Duct 050715 Combustion Air Housing Rear Half SF 25 30 35 42 390848 Nut 8 32 Keps ad 121694 38 Wheel Combustion Air 5 20 350189 Manifold Assembly Complete 171596 Wheel Combustion Air 5 25 30 35 350184 Screw 8 3 8 9 Required 120158 Wheel Combustion Air 5 42 2 350183 Orifice Main Burner SF 20 180305 39 Gasket Firewall Combustion Air 2 071084 Orifice Main Bumer SF 25 180306 40 Motor Assembly with Gasket 5 20 25 30 232682 Orifice Main Burner SF 30 180307 Motor Assembly with Gasket 5 35 232684 Orifice Main Bumer SF 35 180308 Motor Assembly with Ga
7. ALLATION APPLY CAULKING BETWEEN RV SKIN AND BACK OF RAIN SHIELD POSITION RAIN SHIELD AS ILLUSTRATED APPLY SECOND LAYER OF CAULKING OVER RAIN SHIELD BEHIND VENT CAP AS ILLUSTRATEO FOLLOW INSTRUCTIONS FOR CAULKING VENT OUTSIDE SKIN PANEL VENT CAP AND TUBE INTAKE AIR EXHAUST TUBE WITH GASKET VENT CAP AND TUBE AIR INTAKE EXHAUST WITH GASKET 2 2 144 DIA HOLES CAULK VENT CAP AS SHOWN TO SEAL BETWEEN EXHAUST ANO INTAKE AND TO PREVENT MOISTURE INSIDE FURNACE COMPARTMENT APPLY CAULKING GENEROUSLY AROUND PERIMETER OF VENT CAP AND ACROSS CENTER AS SHOWN CENTER PUTTY STRIP IS ESSENTIAL DETAIL A REMOVABLE PANEL OF COACH WALL MUST SEAL WATER TIGHT OUTSIDE SKIN PANEL ELECTRICAL CONNECTION GAS CONNECTION Z INSIDE WALL 2 MAXIMUM WALL THICKNESS FURNACE CABINET Figure 1 OPENING FOR RETURN AIR REMOVABLE PANEL Z 2 3 4 DIA 2 HOLES SEE FIGURE FOR CENTERLINE DIMENSIONS AIR INTAKE TUBE WITH GASKET VENT amp EXHAUST TUBE oP RETURN AIR 9 SPACER SEE DETAIL FIGURE 1 MAINTAIN 1 44 INCH CLEARANCE WHERE DUCTS PASS THROUGH CABINET WALL UL LISTED DUCT MATERIALS CAN BE 04 CLEARANCE CKTHE TOTAL FREE UNDBSTRUCTED RETURN AIR OPENING 1 THE FURNACE HUST NOT BE LESS THAN JHE MINIMUM SPECIFIED IN TABLE L MAXIMUM WALL THICKNESS FOR THIS INSTALLATION IS 2
8. Cut an opening through the inner wall This will allow the rear of the furnace to be installed against the outer panel of the coach 5 Locate center lines for exhaust and intake as shown in Figure 1 6 Cut two 2 1 4 diameter holes through the outer panel of the coach See Figure 1 7 Put furnace in place making sure that rear of the furnace cabinet is as close to outer panel of the coach as possible and still assure proper vent tube overlap See Installing Vent Assembly 8 Using the two 10 x 3 4 stainless screws provided fasten furnace cabinet to floor of coach through the holes provided in the furnace cabinet See Figure 4 9 Be sure furnace is secured within furnace cabinet See Figure 4 10 Install vent assembly See instructions for installing vent B INSTALLATION FLUSH WITH INNER WALL OF COACH See Figure 2 Exterior panel supplied by installer Maximum thickness for this type installation is 27 1 Locate the furnace near lengthwise center of the coach 2 Choose a location for installation out of the way of wires pipes etc which might interfere with the installation Adhere to the minimum clearances from cabinet to combustible construction as listed in Table 2 Refer to Figure 3 for illustration of furnace clearances 3 When an appliance is installed directly on carpeting tile or other combustible material other than wood flooring the appliance shall be installed on a metal or wood panel
9. Damage or repairs required as a consequence of faulty or incorrect installation or application not in conformance with Suburban instructions 4 Failure to start and or operate due to loose or disconnected wires water or dirt in controls fuel lines and gas tanks restriction or alteration of return air circulation low voltage 5 Routine adjustments that may be required to the thermostat electrode and burner Costs incurred in gaining access to the furnace Parts or accessories not supplied by Suburban Freight charges incurred from parts replacements Damage or repairs needed as a consequence of any misapplication abuse unreasonable use unauthorized alteration improper service improper operation or failure to provide reasonable and necessary maintenance 10 Suburban products whose serial number has been altered defaced or removed 11 Suburban products installed or warranty claims originating outside the Continental U S A Alaska Hawaii and Canada 12 Damage as a result of floods winds lightning accidents corrosive atmosphere or other conditions beyond the control of Suburban 13 SPECIAL INDIRECT OR CONSEQUENTIAL PROPERTY ECONOMIC OR COMMERCIAL DAMAGE OF ANY NATURE WHATSOEVER Some states do not allow the exclusion of incidental or consequential damages so the above limitation may not apply to you NO REPRESENTATIVE DEALER OR OTHER PERSON IS AUTHORIZED TO ASSUME FOR SUBURBAN MANUFACTURING COMPANY ANY ADDITIONAL
10. E JSuburban a subsidiary AIRXCEL Inc CERTIFIED SUBURBAN GAS FURNACES INSTALLATION INSTRUCTIONS FOR MODELS SF 20 25 SF 30 SF 35 SUBURBAN MANUFACTURING COMPANY Post Office Box 399 Dayton Tennessee 37321 The design of the furnace has been listed for installation in recreational vehicles only order for the furnace to operate in conformity with generally accepted safety regulations the installation instructions must be followed Failure to comply with the installation instructions will void the warranty on the furnace and any responsibility on the part of Suburban Manufacturing Company The furnace was inspected before it left the factory If any parts are found to be damaged do not install the furnace Immediately contact the transportation company and file a claim FOR YOUR SAFETY WHAT TO DO IF YOU SMELL GAS Extinguish any open flame Evacuate all persons from the vehicle Shut off the gas supply at the gas container or source not touch any electrical switch or use any phone or radio in the vehicle Do not start the vehicle s engine or electric generator Contact the nearest gas supplier or qualified service technician for repairs if you cannot reach a gas supplier qualified service technician contact the nearest fire department Do not turn on the gas supply until the gas leak s has been repaired This book contains instructions c
11. NOTE UL listed duct materials can be 0 clearance F Do not install air boosters in the duct system Such devices will cause the furnace to cycle on limit and to have erratic sail switch operation NOTE After installation of the furnace and duct system is completed adjustments must be made to obtain a temperature rise within the range specified on the Rating Plate INSTALLING THERMOSTAT Locate the room thermostat approximately 4 1 2 feet above the floor on an inside bulkhead where it is not affected by heat from any source except room air Connect thermostat wiring to the blue wires on right side of furnace See wiring diagram PREVENTIVE MAINTENANCE WARNING If the user of this appliance fails to maintain it in the condition in which it was shipped from the factory or if the appliance is not used solely for its intended purpose or if appliance is not maintained in accordance with the instructions in this manual then the risk of a fire and or the production of carbon monoxide exists which can cause personal inju damage or loss of life CAUTION Label al wires before disconnecting for servicing Proper polarity must be observed so the furnace motor will run with the proper direction of rotation to insure correct air delivery See wiring diagram CAUTION Label all wires prior to disconnection when servicing controls Wiring error can cause improper and dangerous furnace operation Always verify proper operation of fu
12. at the outside LP tank Correct operating characteristics depend on the valve being positioned fully open Never attempt to operate with a valve partially closed NOTE This furnace is equipped with a valve shut off switch with switch in OFF position Gas will not flow to burner nor will the furnace operate 6 Set thermostat lever to desired setting If set above room temperature blower will come on 7 Allow 30 seconds for main burner to fight after blower comes on This furnace is equipped with an ignition device which automatically lights the bumer Do not try to light the burner by hand 8 If burner does not light repeat Steps 1 through 8 9 If after three 3 attempts with no ignition go to shut down and contact your dealer or a local recreational vehicle service agency Do not continue to cycle furnace through thermostat in an attempt to get ignition NOTE If furnace should lock out the blower will go off in 5 minutes and remain off until unit is reset by reactivating thermostat TO SHUT DOWN 1 Set the thermostat to lowest setting then move lever to OFF position 2 Turn manual shut off valve if so equipped to the OFF position Do not force ELECTRODE ADJUSTMENT For consistent ignition of the burner itis important that the electrode be positioned properly over the top of the burner The electrode was set at the factory for proper ignition and should not need further adjustment however if you should experi
13. e furnace from cabinet TO REINSTALL 1 Slide unit into cabinet and secure with screw at base of blower 2 Connect gas line 3 Check gas connections for leaks using a soap and water solution Correct any gas leaks immediately 4 Reinstall module board and panel assembly 5 Reconnect electrode wire to board 6 Reconnect power supply to board 7 Reconnect power to furnace NOTE If this connection was made inside the cabinet care must be exercised to prevent wires from coming in contact with the room air blower wheel 8 Reinstall optional back 9 Reinstall vent cap 10 Provide power to furnace OPERATING INSTRUCTIONS WARNING Do not operate furnace while vehicle is in motion or being towed NOTE During initial firing of this furnace burn off of excess paint and oils remaining from manufacturing process may cause smoking for 5 10 minutes 1 Stop Read Users Information Manual supplied with furnace 2 Turn the manual valve if so equipped or the valve at the outside LP tank to the OFF position Do not force 3 Set thermostat above room temperature to begin blower operation A slight delay will occur before the blower comes on Allow blower to run for 5 minutes for combustion chamber purge cycle 4 After 5 minutes move thermostat lever below room temperature Blower will remain on Wait approximately 2 minutes for blower to go off 5 Open manual shut off valve if so equipped or the valve
14. ed NOTE The exhaust temperature of this furnace could discolor or warp some materials You should verify that the material used on the coach door panel or cover will not discolor or warp from the exhaust temperature whenever any door panel or cover is in the open position CAUTION Due to the differences in vinyl siding this appliance should not be installed on vinyl siding without first consulting with the manufacturer of the siding or cutting the siding away from the area around the appliance vent CAUTION In any installation in which the vent of this appliance can be covered due to the construction of the RV or some special feature of the RV such as Slide out pop up etc always insure that the appliance cannot be operated by setting the thermostat to the positive OFF position and shutting off all electrical and gas supply to the appliance Never operate furnace with vent covered Form No 2549 C CAUTION This furnace was shipped from the factory set up for the gas connection to be made at the right rear of the unit as illustrated in Figure 1 If you wish to make gas connection through the top of cabinet you must remove furnace from cabinet and turn gas inlet fitting 90 CLOCKWISE DO NOT TURN FITTING COUNTER CLOCKWISE this will loosen fitting and result in a gas leak WARNING Hold manifold firmly when turning elbow to prevent any force from being inserted on the valve and to prevent any leaks from developing Be sure t
15. emovable panel or wall section of the trailer or motor home must be a minimum of 17 3 4 x 8 ft is important that adequate return air be provided to assure normal heating and operation of the furnace Failure to provide the minimum return air will cause erratic furnace cycling Refer to the chart shown below for minimum return air requirements Return Air Requirements Model Minimum Free unobstructed Area SF 20 25 30 35 55 Sq In TABLE 1 NOTE Return air must be from within the living area of the coach INSTALLATION DIRECTLY AGAINST OUTER PANEL OF COACH See Figure 1 Panel supplied by installer Maximum wail thickness for this type installation is 2 1 Locate the furnace near lengthwise center of the coach 2 Choose a location for installation out of the way of wires pipes etc which might interfere with the installation Adhere to the minimum clearances from the cabinet to combustible construction as listed in Table 2 Refer to Figure 3 for ilustration of furnace clearances 3 When an appliance is instailed directly on carpeting tile or other combustible material other than wood flooring the appliance shall be installed on a metal wood panel extending the full width and depth of the appliance If preferred the carpeting tile or combustible materials other than wood may be cut away the full length and depth of the appliance plus the appliance minimum clearances to combustibles See Table 2 4
16. ence inconsistent ignition reposition electrode as follows Equipment needed flashlight black felt tip pen needie nose pliers and measuring tape NOTE Furnace must be removed See instructions for removing unit 1 Remove burner from combustion chamber by removing six 6 screws which attach the burner to the chamber and air baffles plates 2 Locate the lance in relation to the burner ports for electrode positioning by a Shine a flashlight into the burner venturi as illustrated Be sure flashlight lens is against the end of the burner b Light will reflect off the lance in the venturi of the burner and shine through a portion of the two 2 rolls of burner ports in the top of the burner Using a black felt tip pen mark a line along top of burner 3 16 in back of the lance and parallel with lance Make an additional mark indicating the center line of the lance See illustration Both marks will be used later as reference marks therefore keep lines thin 3 Reassemble the burner 4 Adjust electrode so the electrode probe is positioned along the marked center line of the burner lance and the tip of the electrode terminates 3 16 from the back of the lance At the line marked in Step 2 c See Figure 5 5 IMPORTANT Be sure electrode probe maintains a 1 8 spark gap over the burner as illustrated 6 Reinstall the furnace into the cabinet following the instructions in the manual OPTIONAL RAIN SHIELD INST
17. ess 22 121651 52 Blower Wheel Assy Room Electrode etnies Mia 2 232286 53 Screw 8 18 Burner Assembly Complete 5 20 010767 54 Bushing Universal Burner Assembly Complete SF 25 010762 55 Screw 88 18 X 1 2 Burner Assembly Complete SF 30 35 010865 56 Bushing Strain Relief Grommet 2 070963 57 Gasket Firewall Chamber Side Screw 8 18 1 2 55 121651 58 Chamber Assy Final SF 20 25 30 35 0211498 161122 Chamber Assy Final 5 42 021150BK Pipe Assembly Gas Inlet 2 171574 59 Switch Limit 5 20 232503 Clamp Wire Zeus ua p conse 062180 Switch Limit SF 25 30 35 232504 Screw 8 18 x 1 2 Self Driling yey 121857 Switch Limit SF 42 232505 Screw 10 x 3 4 6 Required 121853 60 Screw 8 X 3 8 2 Required 120158 61 Screw 8 X 3 8 120158 62 Firewall ie ke 110760 TWO YEAR LIMITED WARRANTY SUBURBAN RECREATIONAL VEHICLE FURNACE TWO YEAR LIMITED WARRANTY This Suburban product is warranted to the original purchaser to be free from defects in material and workmanship under nor
18. extending the full width and depth of the appliance If preferred the carpeting tile or combustible materials other than wood may be cut away the full length and depth of the appliance plus the appliance minimum clearances to combustible See Table 2 4 Locate center lines for exhaust and intake tubes as shown in Figure 1 5 Cut two 2 3 4 diameter holes through the removable wall section See Figure 2 6 Put furnace in place making sure that rear of furnace cabinet is as close to inner wall section of the coach as possible and still assure proper vent tube overlap See installing Vent Assembly 7 Using the two 10 x 3 4 stainiess screws provided fasten furnace cabinet to floor of coach through the holes provided in the furnace cabinet See Figure 4 8 Be sure furnace is secured within furnace cabinet See Figure 4 9 Install vent assembly See instructions for installing vent C INSTALLATION USING THE FURNACE ACCESS DOOR SUPPLIED BY SUBURBAN See Figure 4 Maximum wail thickness for this type installation is 2 1 Locate the furnace near lengthwise center of coach 2 Choose a location for installation out of the way of wires pipes etc which might interfere with the installation Adhere to the minimum clearances from the cabinet to combustible construction as listed in Table 2 Refer to Figure 3 for illustration of furnace clearances 3 When an appliance is installed directly on carpeting tile or other comb
19. f input adjustment Minimum 11 W C Maximum 13 W C W C Water Column In the U S A the installation of the furnace must be in accordance with local codes and regulations In the absence of local codes and regulations refer to the latest edition of 1 Standard for Recreational Vehicles ANSI A 119 2 NFPA 501 2 National Fuel Gas Code ANSI 2223 1 3 Furnace must electrically grounded in accordance with the latest edition of the National Electrical Code ANSI NFPA No 70 In Canada the furnace must be installed in accordance with 1 Standard 5 2240 Recreational Vehicles 2 CSA Standard 5 2240 6 2 86 Electrical Requirements Recreational Vehicles 3 Standard 5 27240 4 2 86 Installation Requirements for Propane Appliances and Equipment in Recreational Vehicles 4 149 Installation Codes 5 Any applicable local codes and regulations This unit is equipped with an electric igniter device that has an energy consumption of 1 amp 12 volts D C WARNING Extension tubes cannot be used if you try to extend the vent it will result in improper installation which could cause unsafe furnace operation There are three 3 methods described below for installing the furnace Regardless of the method you choose we require an opening be provided in the exterior of the trailer or motor home for free unobstructed removal of the furnace This exterior r
20. ice person 3 Keep furnace clean More frequent cleaning may be required due to excessive lint from carpeting bedding material etc It is imperative that control compartments burners and circulating air passageways of the appliance be kept clean 4 The motor is permanently lubricated and requires no oiling 5 Keep the furnace area clear of any combustible materials gasoline other flammable vapor and liquids 6 Before operating furnace check the location of the furnace vent to make sure it will not be blocked by the opening of any door on the trailer If it can be blocked do not operate the furnace with the door open 7 Do not restrict the flow of combustion air or the warm air circulation to the furnace To do so could cause personal injury and or death 8 Never operate the furnace if you smell gas Do not assume that the smell of gas in your RV is normal Any time you detect the odor of gas it is to be considered life threatening and corrected immediately Extinguish any open flames including cigarettes and evacuate all persons from the vehicle Shut off gas supply at LP gas bottle See safety notice on front cover of this manual 9 immediately shut furnace down and call a service agency if furnace cycles erratically or delays on ignition WARNING Should overheating occur or the gas supply fail to shut off shut off the manual gas valve to the appliance before shutting off the electrical supply 10 Never a
21. icted in order to provide a 6 minimum clearance between the furnace vent and any door whenever the door is opened NOTE The exhaust temperature of this furnace could discolor or warp some materials You should verify that the material used on the coach door panel or cover will not discolor or warp from the exhaust temperature whenever any door panel or cover is in the open position CAUTION Due to the differences in vinyl siding this appliance should not be installed on vinyl siding without first consulting with the manufacturer of the siding or cutting the siding away from the area around the appliance vent CAUTION In any installation in which the vent of this appliance can be covered due to the construction of the RV or some special feature of the RV such as slide out pop up etc always insure that the appliance cannot be operated by setting the thermostat to the positive OFF position and shutting off all electrical and gas supply to the appliance Never operate furnace with vent covered Form 2549 CAUTION This furnace was shipped from the factory set up for the gas connection to be made at the right rear of the unit as illustrated in Figure 1 If you wish to make gas connection through the top of cabinet you must remove furnace from cabinet and turn gas inlet fitting 90 CLOCKWISE DO NOT TURN FITTING COUNTER CLOCKWISE this will loosen fitting and result in a gas leak WARNING Hold manifold firmly when turn
22. ing elbow to prevent any force from being inserted on the valve and to prevent any leaks from developing Be sure to check all fittings for leaks including the inlet and outiet on the valve before reinstalling furnace into cabinet Correct all teaks immediately NOTE The furnace must be in operation to properly check for leaks NOTE These furnaces must be installed and vented as described in this manual so that the negative pressure created by the air circulating return air fan cannot affect the combustion air intake or venting of any other appliance It is imperative that the products of combustion be properly vented to the atmosphere and that all combustion air supplied to burner be drawn from the outside atmosphere See Installing Vent Assembly NOTE Do not install the furnace with the vent facing toward the forward end of the coach IMPORTANT If this furnace is to be connected to a common duct system also serving a cooling unit a manual or autornatic damper is required to prevent any cold conditioned air from circulating back into the furnace Cold air passing over the furnace combustion chamber during the operation of the cooling unit can result in the formation of condensation inside the furnace combustion chamber This condensation may promote corrosion and premature failure of the combustion chamber E JjSuburban Manufacturing Company a subsidiary of AIRXCEL Inc CERTIFIED SUBURBAN GAS FURNACES INSTALLATION
23. mal use and maintenance for a period of two years from date of purchase whether or not actual use begins on that date It is the responsibility of the consumer owner to establish the warranty period Suburban does not use warranty registration cards for its standard warranty You are required to furnish proof of purchase date through a Bill of Sale or other payment record Suburban will replace any parts that are found defective within the first two years and will pay a warranty service allowance directly to the authorized Suburban Service Center at rates mutually agreed upon between Suburban and its authorized service centers Replacement parts will be shipped FOB the shipping point within the Continental United States Alaska and Canada to authorized service centers performing such repairs Before having warranty repairs made confirm that the service agency is an authorized service center for Suburban DO NOT PAY THE SERVICE AGENCY FOR WARRANTY REPAIRS SUCH PAYMENTS WILL NOT BE REIMBURSED For warranty service the owner user should contact the nearest authorized Suburban Service Center advising them of the model and serial numbers located on the furnace and the nature of the defect Transportation of the unit to and from the Service Center and or travel expenses of the Service Center to your location is the responsibility of the owner user A listing of authorized Service Centers is included in the owner s packet supplied with the furnace and a curre
24. n and shutting off all electrical and gas supply to the appliance Never operate furnace with vent covered INSTALLATION AND REMOVAL OF UNIT INSTALLED FROM INSIDE TO REMOVE 1 Disconnect power supply at furnace 2 Remove vent cap assembly 3 Disconnect gas connections 4 Remove cabinet front 2 screws 5 Remove tie down screw from center of unit and remove furnace from cabinet TO INSTALL 1 Slide unit into cabinet NOTE Care must be taken in routing wiring to back of cabinet and outside of cabinet 2 Reinstall tie down screw 3 Reinstali cabinet front 4 Connect gas fine 5 Check gas connections for leaks using soap and water solution Correct gas leaks immediately 6 Reinstall vent cap assembly 7 Reconnect power supply INSTALLATION AND REMOVAL OF UNIT WHEN OPTIONAL BACK IS USED TO REMOVE Break power to furnace Remove vent cap assembly Remove optional back Disconnect power supply at furnace Disconnect power supply plug from module board Disconnect electrode wire from module board 7 Remove the two 2 screws securing module board and panei assembly to firewall and pull out assembly EXERCISE CARE NOT TO DAMAGE BOARD NOTE This will allow more room for making the gas connections at the flare fitting It will be necessary to hold the flare fitting with a wrench when tightening or loosening the gas line G m L 8 Remove gas line 9 Remove tie down screw at blower base and remov
25. nt cap as shown in Figure 1 Apply caulking generously around perimeter of vent cap and across center as shown 2 Insert intake tube through RV skin and slide it onto the furnace intake See Figure 2 Minimum tube overlap of 1 2 is required 3 Insert vent cap exhaust tube through RV skin and slide it onto the furnace exhaust See Figure 2 Minimum tube overlap of 1 1 4 is required 4 Attach vent cap assembly to outer skin of RV wilh the six 6 screws provided Do not install vent assembly upside down The words Suburban and Dayton must be right side up CONNECTING GAS SUPPLY Connect the gas supply to the furnace at the manifold following the suggestions outlined below It will be necessary to hold the flare fitting on the furnace manifold when connecting or loosening gas line NOTE The compound used on threaded joints must be resistant to liquefied petroleum LP gas NOTE The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at test pressure in excess of 1 2 PSIG The appliance must be isolated from the gas supply piping during any pressure testing of the gas supply piping system at test pressure equal to or less than 1 2 PSIG 1 A 3 8 male flare connection is provided for gas line hookup Some standards may require the use of a manual shut off valve in the gas line external to the furnace cabinet 2 In order to maintain a check of gas supplied
26. nt listing may be obtained from Suburban If you cannot locate an authorized service center locally the service agency chosen to perform warranty repairs must contact our Service Department at 423 775 2131 for authorization Unauthorized repairs made will not be paid by Suburban THREE YEAR LIMITED WARRANTY ON HEAT EXCHANGER The furnace heat exchanger is further warranted to be free from defects in material and workmanship during the third through fifth year after the date of original purchase A replacement heat exchanger will be provided under the same conditions as stated in the two year warranty EXCEPT no labor reimbursement will be provided LIMITATION OF WARRANTIES ALL IMPLIED WARRANTIES INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY ARE HEREBY LIMITED IN DURATION TO THE PERIOD FOR WHICH EACH LIMITED WARRANTY S GIVEN SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU THE EXPRESSED WARRANTIES MADE IN THIS WARRANTY ARE EXCLUSIVE AND MAY NOT BE ALTERED ENLARGED OR CHANGED BY ANY DISTRIBUTOR DEALER OR OTHER PERSON WHOMSOEVER SUBURBAN WILL NOT BE RESPONSIBLE FOR 1 Normal maintenance as outlined in the installation operating and service instructions owner s manual including cleaning of component parts such as orifices and burners 2 Initial checkouts and subsequent checkouts which indicate the furnace is operating properly or diagnosis without repair 3
27. o check fittings for leaks including the inlet and outlet on the valve before reinstalling furnace into cabinet Correct all leaks immediately NOTE The furnace must be in operation to properly check for leaks NOTE These furnaces must be installed and vented as described in this manual so that the negative pressure created by the air circulating return air fan cannot affect the combustion air intake or venting of any other appliance It is imperative that the products of combustion be properly vented to the atmosphere and that all combustion air supplied to burner be drawn from the outside atmosphere See Installing Vent Assembly NOTE Do not install the furnace with the vent facing toward the forward end of the coach IMPORTANT If this furnace is to be connected to a common duct system also serving a cooling unit a manual or automatic damper is required to prevent any cold conditioned air from circulating back into the furnace Cold air passing over the furnace combustion chamber during the operation of the cooling unit can result in the formation of condensation inside the furnace combustion chamber This condensation may promote corrosion and premature failure of the combustion chamber NOTE These furnaces shall be installed so the electrical components protected from water These furnaces are design certified for propane LP gas only Do not attempt to convert to natural gas Gas supply pressure for purposes o
28. overing the operation and maintenance of your furnace Keep with unit at all times Should you require further information contact your dealer or nearest Suburban Service Center FOR YOUR SAFETY DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE WARNING Improper installation adjustment alteration service or maintenance can cause property damage personal injury or loss of life Refer to the installation instructions and or owners manual provided with this appliance Installation and service must be performed by a qualified installer service agency or the gas supplier WARNING Be sure the furnace and all ignition systems are OFF during any type of refueling and while vehicle is in motion or being towed INSTALLATION INSTRUCTIONS WARNING installation of this appliance must be made in accordance with the written instructions provided in this manual No agent representative or employee of Suburban or other person has the authority to change modify or waive any provision of the instructions contained in this manual These furnaces are designed and installed in such a manner as to be removable only from the exterior of the recreational vehicle CAUTION if possible do not install the furnace to where the vent can be covered or obstructed when any door on the trailer is opened If this is not possible then the travel of the door must be restr
29. pressure to the furnace Suburban advises the installer to provide the 1 8 NPT plug tap for test gauge connection immediately upstream of the gas supply connection to the furnace and that it be readily accessible 3 After the furnace has been connected to the gas supply all joints must be checked for leaks WARNING Never check for teaks with an open flame Turn on the gas and apply soapy water to all joints to see if bubbles are formed CONNECTING ELECTRICAL SUPPLY CAUTION This furnace is designed for negative ground 12 volt D C system only Do not attempt to alter the furnace for a positive ground system or connect the furnace directly to 115 volts A C Damage to furnace component parts will occur Be sure ail wiring to the furnace is of heavy enough gauge to keep the voltage drop through it to minimum and to provide enough power for start up surge No 12 gauge wire is recommended If any of the original wire that is supplied with the appliance must be replaced it must be replaced with type 105 C or its equivalent Power supply connections are to be on the right side of the furnace The wires are color coded red for positive and yellow for negative This polarity must be observed so the furnace motor will run the proper direction of rotation to insure correct air delivery See wiring diagram If the furnace power supply is to be from a converter we recommend that the converter system used to power the furnace be wi
30. r information contact your dealer or nearest Suburban Service Center FOR YOUR SAFETY DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE WARNING Improper installation adjustment alteration service or maintenance can cause property damage personal injury or loss of life Refer to the installation instructions and or owners manual provided with this appliance Installation and service must be performed by a qualified installer service agency or the gas supplier WARNING Be sure the furnace and all ignition systems are OFF during any type of refueling and while vehicle is in motion or being towed INSTALLATION INSTRUCTIONS WARNING installation of this appliance must be made in accordance with the written instructions provided in this manual No agent representative or employee of Suburban or other person has the authority to change modify or waive any provision of the instructions contained in this manual These furnaces are designed and installed in such a manner as to be removable only from the exterior of the recreational vehicle CAUTION If possible do not install the furnace to where the vent can be covered or obstructed when any door on the trailer is opened If this is not possible then the travel of the door must be restricted in order to provide a6 minimum clearance between the furnace vent and any door whenever the door is open
31. red in parallel with the battery This will serve two purposes 1 Provide a constant voltage supply to the furnace 2 Filter any A C spikes or voit surges CONNECTING DUCTS TO FURNACE The following duct requirements must be followed in order to assure proper operation of the furnace A The minimum open duct areas listed below must be maintained throughout entire duct system including through register mesa sene satin ouer ht qa Duct Area Ducts Used Size Duct Area Duct Area 5 n SF 35 NOTE Ducts terminating a dead air space like holding tank compartments with no means for return air recirculation should not be counted in the required duct area Also ducts 2 in diameter or smaller should not be counted in the required duct area B Make the duct connections at the furnace cabinet tight Loose connections will result in overheating of the component parts on the furnace and a reduction of the heated air flow through the duct system C Avoid making any sharp turns in the duct system Sharp turns will increase the Static pressure in the plenum area and could cause the furnace to cycle D Avoid making a lot of turns in the duct system The straighter the duct system the better the performance of the furnace E Maintain a minimum of 1 4 clearance where ducts pass through any combustible construction such as coach cabinetry See Figure 3
32. rnace after servicing Your furnace should be inspected by a qualified service agency yearly before turning the furnace on Particular attention should be given to the following items 1 Inspect furnace installation and vent termination to be sure furnace is properly secured in place see installation Instructions that vent terminates to the atmosphere and that vent tubes overlap properly see Installing Vent Assembly 2 Inspect chamber and venting to assure that these components are physically sound without holes or excessive corrosion and that the installation and or re installation is in accordance with Suburban s installation instructions Reference instalation manual supplied with furnace WARNING It is imperative that the products of combustion be properly vented to atmosphere and that all combustion air supplied to burner be drawn from outside atmosphere 3 Check the base on which furnace is mounted Be sure it is physically sound void of any sagging deterioration etc 4 Inspect furnace the venting ducting and gas piping to furnace for obvious signs of deterioration Correct any defects at once 5 Inspect combustion chamber for restrictions in exhaust or intake It is imperative that the flow of intake combustion air and the flow of exhaust gases being expelled to the outside atmosphere not be obstructed Any soot or loose debris should be blown out using compressed air See Figure 7 6 Inspect all gasket
33. s If any gaskets show signs of leakage or deterioration replace them Safe operation of the furnace depends on all gaskets being tight 7 Inspect return air inlet openings to the furnace Remove any restrictions to assure adequate air flow You as the owner user should inspect the furnace monthly during the heating season for presence of soot on vent Operating the furnace under this condition could lead to serious property damage personal injury or loss of life If soot is observed on the vent immediately shut the furnace down and contact a qualified service agency Listed below are several safety related items that you should follow during the heating season to assure continued safe operation of the furnace 1 Inspect furnace venting Venting must be free of obstructions void of soot and properly terminated to the atmosphere See Installing Vent Assembly WARNING Do not install screens over the vent for any reason Screens will become restricted and cause unsafe furnace operation Accessories are being marketed for RV products which we do not recommend For our Safety only factory authorized parts are to be used on your furnace 2 Periodically inspect the vent for obstructions or presence of soot Soot is formed whenever combustion is incomplete This is your visual warning that the furnace is operating in an unsafe manner If soot is present immediately shut furnace down and contact your dealer or a qualified serv
34. sket 5 42 232683 Gasket Burner Access Cover cee nn 070811 41 Screw 4 20 X 5 8 2 Required 2 121945 OPOR T hutu ko 121704 42 Blower Assembly Room Air Front Half SF 20 25 30 35 390872 Plate Secondary Air Top Back Half 5 20 SF 25 SF 30 063198 Blower Assembly Room Air Front Half 5 42 390873 Plate Secondary Air Top Back Half SF 35 063199 43 Screw 88 18 X 1 2 4 121857 Screw 8 18 x 1 2 55 2 121651 44 Blower Housing Room Air Rear Half 390851 Plate Secondary Air Top Front Half SF 20 5 25 5 30 062933 45 Switch 5 a ga 2 Plate Secondary Air Top Front Half SF 35 062936 46 Screw 6 19 X 4 Required Screw 8 18x 1 2 Stainless 2 Required 121651 47 Screw 6 19 X 1 Screw 8 18x 1 2 Stainless 2 Required 2 20 121651 48 Switch ON OFF Plate Secondary Air Bottom 5 20 5 25 5 30 062935 49 Bracket ON OFF Switch Plate Secondary Air Bottom 5 35 062938 50 Module Board Screw 8 18x 1 2 Stainless 2 Required pode Sera 424651 51 Insulator Cap Module Board Coil Screw 8 18x 1 2 Stainl
35. ttempt to repair damaged parts Always have them replaced by a qualified service agency 11 Never attempt to repair the furnace yourself Seek the help of a qualified service person 12 Never restrict the ducting installed by your trailer manufacturer To do so could cause improper furnace operation 13 Do not install air boosters in the duct system Such devices will cause the furnace to cycle and to have erratic sail switch operation 14 Clothing or other flammable material should not be placed on or near the appliance 15 Always follow the operating instructions Do not deviate from the step by step procedures 16 Do not use this appliance if any part has been submerged under water Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control that has been submerged under water 17 When considering add on rooms porch or patio attention must be given tothe venting of your furnace For your safety do not terminate furnace vent inside add on rooms screen porch or onto patios Doing so will result in products of combustion being vented into the room or occupied areas 18 In any installation in which the vent of this appliance can be covered due to the construction of the RV or some special feature of the RV such as slide out pop up etc always insure that the appliance cannot be operated by setting the thermostat to the positive OFF positio
36. ustible material other than wood flooring the appliance shall be installed a metal wood panel extending the full width and depth of the appliance If preferred the carpeting tile or combustible maters other than wood may be cut away the full length and depth of the appliance plus the appliance minimum clearances to combustibles See Table 2 4 After furnace location has been determined cut an opening 18 7 32 x 8 9 32 through the inner coach wall and the outer wall skin of the coach 5 Caulk around opening as illustrated Apply generously The purpose of the caulking is to seal the back side of the door frame and the coach skin water tight 6 Secure frame to outer wall skin through the holes in the frame Screws should be used See Figure 4 NOTE Do not place screws into the holes required for mounting the door 7 Slide furnace in place The back of the furnace should be installed against or as close as possible to the flange on the door frame See illustration The furnace must maintain 1 2 overlap on the intake and 1 1 4 overlap on the exhaust 8 Using the two 10 x 3 4 stainless screws provided fasten furnace cabinet to floor of coach through the holes provided in the furnace cabinet See Figure 4 9 Be sure furnace is secured within furnace cabinet See Figure 4 10 Position furnace access door over the frame Secure the door to the coach skin Be sure the coach skin is of sufficient strength to keep
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