Suburban SH-35 User manual

SUBURBAN MANUFACTURING COMPANY
Post Office Box
399
Dayton, Tennessee 37321
CERTIFIED
SUBURBAN GAS FURNACES
INSTALLATION INSTRUCTIONS
FOR MODELS SH-35 SH-42
Thedesign ofthefurnace has been listedfor installation inrecreational vehicles only. Inorderforthefurnacetooperateinconformity
with generally accepted safety regulations, the installation instructions must be followed. Failure to comply with the installation
instructionswill voidthe warranty onthe furnaceandany responsibility onthe partof Suburban Manufacturing Company.
Thefurnacewasinspected before
it leftthefactory. Ifany partsarefoundtobedamaged, donotinstallthefurnace. Immediatelycontact
thetransportation company andfile a claim.
1- FOR YOUR SAFETY 1
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.
Do not touch any electrical switch, or
use any phone or radio in the vehicle.
Do not start the vehicle's engine o
electric generator.
Contact the nearest gas supplier o
qualified service technician for repairs.
If yo14 cannot reach a gas supplier or
qualified service technician, contact the
nearest fire department.
Do not turn on the gas supply until th
gas leak(s) has been repaired.
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
maintenancecan cause property damage,
personal injuryor 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.
I motion or being towed.
This book contains instructions covering the operation and
maintenance ofyourfurnace. Keepwith unitatalltimes.
should you require further informati,~n,contact your dealer or
nearest Suburban ServiceCenter.
INSTALLATION INSTRUCTIONS
WARNING! Be sure the furnace and all
ignition systems are "OFF" during any
type of refueling and while vehicle is in
WARNING!Installationofthis appliancemustbemadeinaccordancewith
thewritten instructions provided inthis manual. No agent, representative
or employee of Suburbanor other person has the authority to change.
modify or waive any provision of the instructions contained in this
manual.
These furnaces are designedand installed insuch amanner as to beremovable
only from the exterior of the recreationalvehicle.
CAUTION: If possible, do not install the furnace to where the vent can be
covered or obstructed when any door onthe trailer is opened. Ifthis is not
possible, then the travel of the door must be restricted inorder to provide
a
6" minimum clearancebetweenthe furnace vent and any door whenever
the door isopened.
NOTE: The exhaust temperature of this furnace
c
'3 discolor or warp some
materials.You should verify that the material used 01,the coachdoor, panel, or
coverwill not discoloror warp from the exhausttemperaturewhenever any door.
panel,or cover is inthe open position.
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 withvent covered.
CAUTION: This furnace was shipped from the factory set up for the gas
connectionto bemadeat the riqhtrearofthe unitas illustrated inFiqure
I.
If you wish to make gas conn&tion through the top of cabinet, yo; must
removefurnace from cabinet andturngas inletfitting
90" CLOCKWISE. DO
NOT TURN FITTING COUNTERGLOCKWISE, this will loosen fitting and
result inagas leak.
WARNING! Holdmanifoldfirmly whenturning elbow to preventanyforce
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
outlet on the valve before reinstalling furnace into cabinet Correct all
leaks immediately. NOTE: The furnace must be inoperation to properly
check for leaks.
NOTE: These furnaces must be installedand ventedas described inthis manual
C~UTION: D~~ to thedifferences in vinyl siding, this appliance should not
SO that the negativepressure created bythe air circulating(returnair) fan cannot
beinstalled on vinyl siding withoutfirst consulting with the manufacturer of
affect the combustionair intakeor ventingofany other appliance.It isimperative
the siding or cutting the siding away from the area around the appliance
that the productsofcombustion be properlyvented to the atmosphere and that all
vent. combustionair supplied to burner be drawn from the outside atmosphere.(See
InstallingVent Assembly.)
CAUTION: In any installation in which the vent of this appliance can be
coveredduetotheconstruction ofthe RV or some soecial featureofthe RV
NOTE: Do not installthe furnace with the vent facing toward the forward end of
such as slide out, pop-upetc. always insurethat the appliance
can not^
the coach.
Form No. 25306

IMPORTANT: If this furnace is to be connected to a common duct system also
servinga cooling unlt, a manual or
automatic damper IS required to prevent any
coldcondltloned alr from circulating back ~ntothe furnace Coldair passlng over
thefurnacecombustion chamberdur~ng
theoperatlonofthecoollng unitcanresult
inthe formation of condensation Inside the furnace combust~onchamber Th~s
condensat~onmay promote corrosion and premature failure of the combustion
chamber.
NOTE: These furnaces shall be installed sc the
electrical components are
protectedfrom water.
These furnaces are design certif~edfor propane1LP gas only. Do not attempt to
convert to natural gas.
Gas supply pressure for purposes of lnput 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 ~naccordance with local
codesand regulat~ons.Inthe absence of local codes and regulations, referto the
latestedition of.
1. Standardfor RecreationalVehicles ANSl A-119.2lNFPA 501C.
2. Nat~onalFuel Gas Code ANSl 2223.1
3. Furnacemust be electrically grounded ~naccordancewith the latest edition of
the National Electrical CodeANSIINFPA No. 70.
InCanada,the furnace must be installed in accordancewith.
I. Standard CANICSA-Z24O Recreational Veh~cles.
2. CSA Standard CANICSA-Z240.62-M86 Electrical Requirements for
RecreationalVehicles.
3. Standard CANICSA-Z240.4.2-M86 Installation Requirements for Propane
Appliances and Equipment in
Recreational Vehicles.
4. CANICGA-B149 Installation Codes
5. Any applicable local codes and regulations.
This unit is equipped with an electr~cigniter device that has an energy
consumptionof .lamp
@ 12 volts D.C.
WARNING! Extensiontubes cannotbeused. Ifyou trytoextendthevent,
it will result in improper installation which could cause unsafe furnace
operation.
Therearethree(3) methodsdescribed belowfor installingthefurnace.Regardless
of the method you choose,we require an openlng be providedin theexterior of
the trailer or motor home for free, unobstructed removal of the furnace. This
exterior, removable panel or wall section of the trailer or motor home must be a
minimumof 17-314 x 8.
It is important that adequate return air be provided to assure normalheatingand
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 MinimumFree(unobstructed) Area
TABLE
I
SH-35
SH-42
Note: Return air must be from within the living area of the coach.
55 Sq. In.
142 Sq. In.'
'may be reduced to 88 sq ~n mtn ~f 5 ducts are used
A. INSTALLATION DIRECTLY AGAINST OUTER PANELOF COACH
(See Figure I)(Panel supplied by installer)
Maximum wall thickness for this type installation is2".
1. Locatethe furnace near lengthwise center of the coach.
2. Choose a location for installation out of the way of wires, pipes, etc.. which
mightinterferewith the installation. Adhere to the minimum clearances from the
cabinet to combustible construction as listed in Table 2. Refer to Figure 3 for
illustrationof furnace clearances.
3. When an applianceis installed directlyon carpeting, tile or other combustible
material, other than wood flooring, the appliance shall be installed on a metal or
wood panel extending the full width and depth of the appliance. If preferred, the
carpeting,tile or combustible materials, otherthanwood maybe cutaway the full
length and depth of the appliance plus the appliance minimum clearances to
combustibles. (See Table 2.)
4. Cut anopening throughthe inner wall. Thlswill allow the rear of the furnace to
be installed against the outer panel of the coach.
5. Locatecenter lines for exhaust and intake, as shown in Figure 1
6. Cut two 2-114" diameter holes through the outer panel of the coach. (See
Flgure 1 .)
7. Put furnace in place, making sure that rear of the furnace cabinet is as close
to outer panelof the coachas possible and still assure proper vent tube overlap.
(See InstallingVent Assembly.)
8. Using the two #I0x 314 stainless screws provided,fasten furnace cabinet to
floor of coach through the holes provided inthe furnace cabinet. (See Figure 4.)
9. Be sure furnace is secured within furnace cabinet. (See Figure4.)
10. Install vent assembly. (See instructions for installing vent.)
B. INSTALLATION FLUSH WITH INNER WALL OF COACH
(See Figure2) (Exterior panel supplied by installer)
Maximum wall thickness for this type installation is
2".
I. Locatethe furnacenear lengthwise center of the coach.
2. Choose a location for installation out of the way of wires, pipes, etc, which
m~ghtinterfere wlth the installation. Adhere to the minimum clearances from
cabinet to combustible construction as l~stedin Table 2. Refer to Figure 3 for
illustration of furnace clearances
3. When an appliance is installed directly on carpetlng, tlle or other combustible
material,other than wood flooring, the appliance shall be installed on a metal or
wood panel extendingthe full wldth and depth of the appliance. If preferred, the
carpetlng,tileor combustible materials,other thanwood maybecutaway 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 Flgure 1
5. Cuttwo 2-314"diameter holes throughthe removablewall sect~on.(SeeF~gure
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 InstallingVent Assembly.)
7. Using the two #10 x 314 stainless 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 securedwithin furnace cabinet (See Figure4.)
9. Installvent assembly. (See instructions for installing vent.)
C. INSTALLATION USING THE FURNACE ACCESS DOOR SUPPLIED BY
SUBURBAN (See Figure4)
Maximum wall thickness for this type installation is
2".
I. Locatethe furnace near lengthwise center of coach.
2. Choose a location for installation out of the way of wires, pipes, etc.,which
might interferewith 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 combustible
material, other than wood flooring, the appliance shall be installed on a metal or
wood panel extendingthe 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 furnacelocationhas beendetermined, cut anopening 18-7/32x10-1132"
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 isto seal the back side ofthe door frame and the coach skinwater tight.
6. Secureframetoouterwall(skin)throughthe holesinthe frame.Screwsshould
be used. (See Figure4.) NOTE: Do not place screws into the holes required for
mountingthe door.
7. Slide furnacein place. The back ofthe furnace should be installedagainst or
as close as possible to the flange on the door frame. (See illustration.) The
furnace must maintain 112" overlap on the intake and 1-114 overlap on the
exhaust.
8. Using the two #I0x 314 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. Besure the coach skin isof sufficient strengthto keep furnaceaccessdoor
in place and insure a tight seal. It may be necessary to build a wood or metal
framearoundtheopeninginorderto provideadequatestrengthfor securingdoor.
CAUTION: The screws provided with the door may not be of sufficient
lengthand size for allapplications and itmay be necessaryforthe installer
tosubstitute screws inorder toadequately securethefurnace access door.
11. Installvent assembly.(See instructions for installing vent.)
Left Right Exhaust and
Model Front Side Side Top Bottom Back IntakeTube
SH-35 1" 1" 1" 1"
0 0
318"
SH-42 1" 2" 2" 1" 0 0" 3/RV
-NOTE-
0" MEANS TO SPACER BUMPS
CLEARANCE FROM DUCTS TO
COMBUSTIBLE MATERIAL
- 114" (See Figure3)
TABLE
2
INSTALLINGVENT ASSEMBLY
The vent outlet must be installedso it is in the same atmospheric pressurezone
as thecombustion airintake.Theexhaustandintaketubes mustbeinstalledfrom
the outside. pass through the RV skin and slide onto the furnace exhaust and
intake
WARNING! Donotalterthe vent assembly suppliedwiththisfurnace. Any
modificationswillresultinimproperinstallationwhichcouldcauseunsafe
furnace operation.
CAUTION! Combustionairmustnotbedrawnfromthe livingarea. All air for
combustionmustbedrawnfromtheoutside atmosphere. Allexhaustgases
mustbe vented tothe outside atmosphere
- never insidetheRV. Therefore,
it isessentialto insure that the vent cap and tube assemblies are properly
installed.

1.Applycaulking to RV skln behlndvent cap as showninF~gure1 Applycaulking
generously around perimeter of vent cap and across center as shown
2. Insert Intake tube through RV skin and slide ~tonto the furnace intake (See
Figure
1.) Minimum tube overlap of 112" is required.
3. Insert vent cap exhaust tube through RV skln and sl~de~tonto the furnace
-exhaust (See F~gure1 ) Mln~mumtube overlap of 1 114" IS required
Wach vent cap assembly to outer skln of RV w~ththe SIX (6) screws provided
I not install vent assembly ups~dedown The words "Suburban" and "Dayton
I enn " must be r~ghts~deup
CONNECTING GAS SUPPLY
Connect the gas supply to the furnace at the manifold,following the suggest~ons
outlined below Itw~llbe necessaryto hold the flare fitting on the furnace man~fold
when connecting or loosen~nggas line.
NOTE: The compound used on threaded joints must be res~stantto l~quef~ed
petroleum (LP)gas
NOTE'Alterinstallationofthefurnaceandduct systemiscompleted,adjustments
must be made to obtain a temperature rise within the range specified on the
Ratlng Plate. INSTALLINGTHERMOSTAT
Locatethe room thermostatapproximately4-112feet 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 s~deof furnace. (See wiring
diagram
)
PREVENTIVE MAINTENANCE
in which itwas shipped from the factory or ifthe 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
NOTE: The appliance must be disconnected from the gas supply PlPing System CAUTION: Labelallwires beforedisconnecting for servicing. Proper polarity
during any pressuretestlng ofthatsystem at test pressure in excess of 112 PSlG mustbeobserved sothe furnace motorwill runwiththeproperdirectionof
The appl~ancemust be isolated from the gas supply piping durlng any pressure rotationto insurecorrect air delivery. (See wiring diagram).
testing of the gas supply piping system at test pressure equal to or less than 112 CAUTION: Label all wires prior to disconnection when servicing controls.
PSIG. Wiring error can cause improper and dangerous furnace operation.
1. A 318" male flare connection is provided for gas llne hookup. Some standards Always verify proper operation offurnace after servicing.
may require the use of a manual shut off valve in the gas line external to the
furnace cabinet. Your furnace should be Inspected by a qualified service agency yearly before
turning the furnaceon. Particularattention shouldbegiven to thefollowing items.
2. Inorderto maintaina check of gas supplied pressure to thefurnace. Suburban
advises the installer to provide the NPT plug tap for test gauge connection 1. Inspectfurnace installationand vent terminationto be surefurnace is properly
immediately upstream of the gas supply connectlon to the furnace and that it be secured In place (See Installation Instructions), that vent terminates to the
readilyaccessible. atmosphere, and that vent tubesoverlap properly(seeInstallingVent Assembly.)
3. Alter the furnace has been connected to the gas supply, all joints must be 2. Inspect chamber and venting to assure that these components are physically
checked for leaks. sound wlthout holes or excessive corrosion and that the installation andlor re-
installation is inaccordancewith Suburban's installation instructions. (Reference
installation manual SuDDlied with furnace.)
WARNING! Never check for leakswithan open flame. Turn onthegas and
apply soapy water to alljoints to see if bubbles are formed.
signs of deterioration. Correct any defects at once.
Be sure all wiring to the furnace is of heavy enough gauge to keep the voltage
drop through it to a minimum and to provideenough powerfor start-upsureg, NO. 5. Inspect combustion chamber for restrictions in exhaust or intake. It is
12gauge wiring is recommended, ifany of the original wire that is supplied with imperative that the flow of intake combustion air and the flow of exhaust gases
the appliance must be replaced, it must be replaced with type 105" c or its being expelled to the outside atmosphere not be obstructed Any Soot or loose
=,quivalent. debris should be blown out using compressed air. (See Figure
7.)
CONNECTING ELECTRICAL SUPPLY
\wersupply connections are to beonthe right s~deofthefurnace The wires are
--:lor coded, red for posltlve (+) and yellow for negatlve (-) Thls polarlty must be
o served so the furnace motor will run the proper direction of rotat~onto Insure
c rrect alr dellvery (See wlrlng diagram )
WARNING! Itis imperative that the products of combustion beproperly
vented toatmosphere and that all combustion air suppliedto burner be
drawn from outside atmosphere.
If the furnace power supply is to be from a converter, we recommend that the
converter system used to power the furnace be wired in parallelwith the battery
This will serve two purposes:
CAUTION: Thisfurnace isdesignedfor negativeground12volt D.C. system
only, Do not attempt to alter the furnace for a positive ground system or
3. Check the base on which furnace is mounted. Be sure it is physically sound.
connectthefurnacedirectlyto 115volts A.C. Damagetofurnacecomponent 'Oid Of any sagging' deterioration,
etc.
parts will occur.
4. Inspect furnace, the venting, ducting and gas piping to furnace for obvious
I. Provide a constant voltage supply to the furnace
2. Filter any A.C. spikes or volt surges.
CONNECTING DUCTS TO FURNACE
The following duct requirements must be followe~in order to assure proper
operation of the furnace:
A. The minimumopen duct areas listed below mu: be maintained throughout
entire duct system including through register:
1 MODEL 1 SIDE DUCTS
I TOP DUCT I BOTTOM DUCT I
SH-35 1 48 SQ. IN. I 4 1 4" 1 56 SQ. IN. 1 56 SQ. IN.
Min. Open
DuctArea
6. lnspect all gaskets. If any gaskets show signs of leakage or deterioration.
replace them. Safe operation of the furnace depends on all gaskets being tight.
7. lnspect return air inlet openings to the furnace. Remove any restrictions to
assure adequate air flow.
You, as the ownerluser, should inspect the furnace monthly during the
heating season for presence of soot on vent. Operat~ngthe furnace under this
condition could lead to serious propertydamage, personal injuryor 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.
Min. No.
DuctsUsed
1. lnspectfurnace venting.Ventingmust befreeofobstructions,voidofsoot,and
~ro~erlvterminated to the atmos~here.(See lnstallino Vent Assemblv.1
WARNING! Do not install screens over the vent for any reason. Screens
will becomerestricted and cause unsafefurnace operation. Accessories
are being marketed for RV products which we do not recommend. For
yoursafety, onlyfactory authorized partsaretobeused onyour furnace.
2. Periodically inspect the vent.for obstructions or presence of soot. Soot is
formed whenever combustion is incomplete. This isyour visual warning that the
furnace is operating in an unsafe manner. If soot is present, immediately shut
furnace down and contact your dealeror a qualified service person.
Duct
Size
NOTE: Ducts terminating in 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 inthe required ductarea.
Min. Open
DuctArea
B. Makethe duct connectionsat the furnace cabinet tight. Looseconnectionswill
resultinoverheating of the component partson thefurnarr 2nd areductionof the
heated air flow through the duct system.
Min. Open
DuctArea
3. Keepfurnace clean. Morefrequentcleaning may berequired due to excessive
I I I I
C. Avoid makinganysharpturns intheduct system. Sharpi.jmswill increasethe
static pressure in the plenum area and could cause the furnace to cycle.
'SH-42 Bottom Duct requiros uso of Bottom Duct Kit, Part No. 520864. lint from carpeting, bedding material, etc. It is imperative that control
compartments, burnersand circulatingair passagewaysof the appliance bekept
SH-42
D. Avoid makinga lotof turns in the duct system. The straighter the duct system.
the better the performance of the furnace.
48 SQ. IN. 4 1 4" 1 56 SQ. IN. ( '72SQ. IN.
clean
4. The motor is permanentlylubricated and requires no oiling
5. Keep the furnace area clear of any combustible materials, gasoline or other
flammable vapor and liquids.
6. Beforeoperating furnace, check the locationof thefurnace vent to make sure
it will not beblocked bytheopeningof 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 personalinjuryandlor death.
Malntaln a minlmum of 114 clearance where ducts pass through any
-,.ombust~ble construcbon,such as coach cabmetry (See F~gure 3 ) NOTE UL
llsted duct mater~alscan 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.

8. Never oDerate the furnace cf vou smell oas Do not assume that the smell of TO REINSTALL
gas 1s normal Any tlme you detect the o2or of gas ~t1s to be
considered lcfe
threaten~ngand corrected immed~atelyExtlngulsh any open flames lncludlng
ccgarettesand evacuate all persons from the veh~cleShut off gas supply at LP
gas bottle (See safety notice on front cover of thls manual
)
9. Immediately shut furnace down and call a servlce agency cf furnace cycles
erratccally or delays on cgn~tcon
WARNING! Should overheating occur, or the gas supply fail to shut off.
shut off the manual gas valve to the appliance before shuning off the
electrical suoolv.
10. Never attempt to repacr damaged parts Always have them replaced by a
qualified servlce agency.
11. Never attempt to repair the furnace yourself. Seek the help of a qualified
serv~ceperson.
12. Neverrestrcct the duct~ng installed byyour trailermanufacturer.Todo so could
cause improper furnace operation.
13. Do not install air boosters ~nthe duct system Such devices will cause the
furnace to cycle and to haveerratlc sail switch operation.
14. Clothing or other flammable materlal should not be placed on or near the
appl~ance.
15. Always follow the operating lnstructions Do notdeviate from the step-by-step
procedures.
16. Do not use this appliance if any part has been submerged under water.
Immediately call a qualcfced service technic~anto inspect the appliance and to
replace any part of the control system and any gas control that has been
submerged under water.
17. Whenconsidering add-onrooms,porchor patio,attention mustbegiven tothe
ventingof your furnace. For your safety, do not terminate furnace vent insideadd-
on rooms, screen porch or onto patios. Doing so will result in products of
combustion being vented lnto the room or occupied areas.
18. Inany installation inwhich the ventofthisappliance can becovereddue to the
construction of the RV or some special feature of the RV suchas slide out, pop-
up, etc. always insure that the appl~ancecannot be operated by setting the
thermostat to the positive "OFF" posction and shutting off all electrical and gas
supply to the appliance. Never operate furnace with vent covered.
INSTALLATIONAND REMOVAL OF UNlT
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. NOTECare must be taken in routing wiring to back of
cabinet and outside of cabinet.
2. Reinstall tie-down screw.
3. Reinstall cabinet front.
4. Connect gas line.
5. Check gas connections for leaks using a soap andwater solution. Correct any
gas leaks immediately.
6. Reinstall vent cap assembly.
7. Reconnect power supply.
INSTALLATION AND REMOVAL OF UNlT
WHEN OPTIONAL BACK IS USED
TO REMOVE
1. Break power to furnace.
2. Remove vent cap assembly.
3. Remove optional back
4. Disconnect power supply at furnace
5. Disconnect power supply plug from module board
6. Disconnect electrode wlre from module board
7. Remove the two (2) screws securing module board and panel assembly to
firewall and pullout 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.
8. Remove gas line.
9. Remove tie-down screw at blower baseand remove furnace from cabinet
1 Slcde unlt lnto cablnet and secure w~thscrew at base of blower
2 Conneclgas l~ne
3 Check gas connectlons for leaks uslnga soap and water solution Correct any
gas leaks cmmedcately
4 Relnstall module board and panel assembly
5 Reconnect electrode wlre to board
6 Reconnect power supply to board
7 Reconnect power to furnace NOTE If thls connection was made Inside the
cablnet care must be exercised to preventwcres from coming incontactwlth the
room air blower wheel
8 Relnstall opt~onalback
9. Relnstall vent cap
10 Provide power to furnace
OPERATING INSTRUCTIONS
WARNING! Do not operate furnace while vehicle is inmotion or being
towed.
NOTE: During initial firing of this furnace, a burn-off of excess paint and oils
remaining from
manufacturing process may cause "smoking"for 5 - 10 minutes.
I. Stop! Read Users InformationManual supplied wcth 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
delaywill occur beforethe blower comes on.Allow blower to run for
5 minutesfor
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 manualshut-off valve (ifsoequipped)or the valve attheoutside LPtank.
Correctoperating characteristics dependonthevalve 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. Setthermostat lever to desired setting. If setabove room temperature, blower
will come on.
7. Allow 30 seconds for main burner to light after blower comes on. This furnace
is equipped with an ignition device which automatically lights the burner. Do not
try to light the bumer by hand.
8. If burner does not light, repeat Steps 1 through 8
9. If after three (3) attempts w~thno Ignlt~on,go to shut down and contact your
dealer or a local recreat~onalvehrcle servlce agency Do not contlnue to cycle
furnace through thermostat ~nan attempt to get lgnlt~onNOTE Iffurnace should
lock out, the blower
will go off ~n 5 mlnutes and remaln off untll unlt IS reset by
reactlvatlng thermostat
TO SHUT DOWN
I. Set the thermostat to lowest setting, then move lever to "OFF" position
2. Turn manualshut off valve (if so equipped) to the'OFF" position. Donotforce.
ELECTRODE ADJUSTMENT
Forconsistentignitionoftheburner,itisimportantthat the electrode be positioned
properlyover the top of the burner. The electrode was set atthe factory for proper
ignition and should not need further adjustment; however, if you should
experience inconsistent ignition, reposition electrode as follows:
Equipmentneeded:
flashlight
black felt-tip pen
needle-nose pliers
measuring tape
NOTE: Furnace must be removed. (See instructions for removing unit.)
I. 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 !he 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.
c. Usinga black felt-tip pen, mark a line along top of burner 3/16" inback of
the lance and parallel with lance. Make an additional mark indicating the
center lineof the lance. (Seeillustration.) Both marks will be used later as
reference marks: therefore, keeplines thin.
3. Reassemble the burner.
4. Adjust electrode so the electrode probe is positioned along the marked center
lineofthe burner lance andthe tip of the electrode terminates
3/16 from the back
of the lance. (At the line marked inStep 2-c.) (See Figure
5.)
5 IMPORTANT: Besureelectrodeprobemaintalnsa 118" sparkgapoverthe
burner as illustrated.
6. Re~nstallthe furnace lnto the cabmet following the lnstruct~ons~nthe manual

FRONT END OF BuRNcRJ
4, YMARK BURNLR ,308 FROM BACK OF LANCC
\ 0 1 r.125 SPARK GAP OVER TOP
yLAKE
VtHTURl TUBE
Figure 5
BURNER
ALL WIRES ARE 18 AWG UNLESS OTHERWISE SPECIFIED
NOTE, IF ANY OF THE ORIGINAL WIRES AS SUPPLIED
WITH THE APPLIANCE MUST BE REPLACED, IT MUST
BE REPLACED WITH WIRING MATERIAL HAVING A
TEMPERATURE RATING OF AT LEAST
105' C.
+ 16/30 20O'C RADIX (SIL-A-BLEND) 18 AWG WIRE
l*d 14 AWG 105.C THERMOPLASTIC
CAUTION: DO NUT HI-POT
(DIELECTRIC HIGH VOLTAGE
TEST) THIS UNIT AFTER
INSTALLATION. TO DO SO MAY
CAUSE COMPONENT DAMAGE AND
VOIDS WARRANTY OF FURNACE.
UNIT
100% FIRE CHECKED.
TO CLEAN THE CHAMBER, THE FURNACE MUST BE REMOVED FROM
THE CABINET AND THE MANIFOLD. BLOWER ASSEMBLY AND CONTROLS
Figure 7
6
-
- -
Figure 6
L I
Figure 8

ltom
Figure 9
Description
Cabinet Front Assemblv
Figure 10
REPLACEMENT PARTS LIST
Only factory authorized parts are to bo usod . Do not attompt to repair
dofectivo parts
.
Whenorderingrepairpartsfromyourdealer . aSuburbanServ~ceCenter . ord~str~butor
always glve the following inforniat~on:
1 . Part Number (Not ltem No.)
2 . Part Description
3
. Model and Serial Number of furnace
4 . Number of Parts Required
Part Numbor
SH-35 SH-42
101907 101907
Thermostat 161154 161154
Screw #I0x 314 (2
Required) 121853 121853
Screw #8 x 318 (2 Requ~red) 120158 120158
Cab~nelAssembly 101921 101915
Cover Duct 050733 050733
Collar
. Dud ......................... 050715
Nut 8-32 Keps
....................... 121694
ManifoldAssembly Complete ................... 171599
Screw#8-18 x 112 (9 Required) ................ 121651
Orifice
. Main Burner .................... 180308
Gasket . BurnerAccess Cover ................ 070811
Tinnerman
............................... 121704
Plate
. Secondary Air (Top-Back Halo ........... 063199
Screw#8-18 x 112 Stainless ................... 121651
Plate
. Secondary Air (Top-Front Halo ............ 062936
Screw#8-18 x 112 Stainless (2 Required) ..... 121651
Screw#8-18 x 112 Stainless (2 Reouired) ...... 121651
Plate Secondary AI~(Bottom) 062938
Screw #8-18 x 112 Stainless (2Requ~red) 121651
Screw #8-18 x 112 Sta~nless 121651
Electrode 232286
BurnerAssembly Complete 010799
Grommet 070963
Screw #8 18 x 112
Stainless
121651
. -~
valve ....................... 161122 161122
.
PlpeAssembly Gas Inlet ............ 171603 171603
......................
Clamp. W~re 062180 062180
Screw#8-18 x 112 Self-Drilling ........... 121857 121857
Screw#lO x 314 (6 Required) ........... 121853 121853
Vent Cap and Exhaust Tube Assembly .. 260231 260231
...........
Screw 8 x 112 (8 Required) 120615 120615
Screw8 x 112 (6 Required)
............
120615 120615
BoxAssembly (Combust~onAir Intake)
.....
051430BK 051430BK
Gasket, Combust~onAir Houslng ..............
071108 071108
ltem
No .
36
37
37A
38
Part Numbor
Descnpt~on SH-35 SH-42
Wheel Combust~onAI~ 350199 350199
Combustton Air Houslng 390862BK 390862BK
Bracket Spacer 062949 062949
Screw #8-18 x 112 Self Dr~ll~ng 121857 121857
Gasket F~rewall(Combust~on
Air) 071107 071107
Gasket Motor 071085 071085
MotorAssembly ........................... 232727 232726
Nut 10-32 (Lock) 2 Required
................... 121329 121329
Nut (2 Required)
............................... 121951 121951
Screw#2-56 x518 (2 Required) .................... 121247 121247
Sa~lSwitch (Assemblvl ........................... 232325 232261
Screw#8-18 x 112 (4 Required) ..................... 121857 121857
Blower Assembly (RoomAir)
................... 390867BK 390867BK
Wheel . RoomAir ......................... 350198 350198
............................ Switch. ONIOFF 232351 232351
....................
Screw #8-18 x 112 (2 Requ~red) 121857 121857
PanelAssembly (Module Board)
.................. 101663 101663
. .....................
Insulator Module Board 070807 070807
Module Board
................................ 520820 520820
. .................. Insulator Cap Module BoardCoil 070973 070973
.............................. Screw #8-18 x 112 121857 121857
. ........................... Bushing Universal 070362 070362
..........................
Bushing. Strain Relief 231809 231809
..................
Gasket. Firewall (Chamber S~de) 070808 070808
Nut6-32 Hex Lock 12 Reou~redl
................... 121271 121271
...
Chamber Assembly Final ...................... 021171BK 021172BK
Switch . Limit ................................ 232504 232735
Screw #8 x 318 (2 Required)
....................... 120158 120158
Screw#8 x318 ............................. 120158 120158
Firewall ..................................... 110750 110750
Tube Assembly Intake (Vent)
...................... 051478 051478
Screw #8-18 x 112
............................ 121857 121857

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 normal 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 establishthewarranty period. Suburban does not usewarranty 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 beshipped FOBthe shipping point within the Continental United States, Alaska and Canada to authorized service centers performing such
repairs. Before havinq warranty repairs made, confirm that the service aqency is an authorized service center for Suburban. DO
NOT PAYTHE
SERVICE AGENCY FOR WARRANTY REPAIRS; SUCH PAYMENTSWlLL NOT BEREIMBURSED.
For warranty service, the ownerluser 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 andlor travel expenses
of the Service Center to your location is the responsibility of the ownerluser. A listing of authorized Service Centers is included in the owner's
packet supplied with thefurnace and a current listing may be obtained from Suburban. Ifyou 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 inmaterial andworkmanship during the third through fifth year after the
date of original purchase. A replacementheat exchanger will be provided under the sameconditions as stated inthe two year warranty EXCEPT
no labor reimbursement will be provided.
LIMITATION OF WARRANTIES
ALL IMPLIEDWARRANTIES (INCLUDING IMPLIEDWARRANTIES OFMERCHANTABILITY) ARE HEREBY LIMITEDINDURATIONTOTHE
PERIODFORWHICH EACH LIMITEDWARRANTY ISGIVEN.SOME STATES DO NOTALLOW LIMITATIONSONHOW LONGAN IMPLIED
WARRANTY LASTSSOTHEABOVE LIMITATIONSMAYNOTAPPLYTOYOU. THE EXPRESSEDWARRANTIES MADEINTHISWARRANTY
ARE EXCLUSIVE AND MAY NOT BE ALTERED, ENLARGED. OR CHANGED BY ANY DISTRIBUTOR. DEALER OR OTHER PERSON
WHOMSOEVER.
SUBURBAN WlLL NOT BE RESPONSIBLE FOR:
1. Normalmaintenanceas outlined inthe installation, operating and service instructions owner's manualincluding cleaning of component parts;
such as, orifices and burners.
2. Initialcheckouts and subsequent checkouts which indicatethe furnace is operating properly, or diagnosis without repair.
3. Damage or repairs required as a consequence of faulty or incorrect installation or application not in conformance with Suburban instructions.
4. Failure to start andlor 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.
6. Costs incurred in gaining access to the furnace.
7. Parts or accessories not supplied by Suburban.
8. Freight charges incurred from parts replacements.
9. 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, Hawaiiand Canada.
12. Damage as a result of floods, winds, lightning, accidents, corrosive atmosphere or other conditions beyond the control of Suburban.
13. ANY 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.
NOREPRESENTATIVE,DEALEROROTHERPERSONISAUTHORIZEDTO ASSUME FORSUBURBANMANUFACTURINGCOMPANYANY
ADDITIONAL. DIFFERENT OR OTHER LIABILITY INCONNECTION WITH THE SALE OFTHIS SUBURBAN PRODUCT.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
IF YOU HAVEA PRODUCT PROBLEM
FIRST:
If your RVhas its original furnace and is still under the RVmanufacturer'swarranty, follow the steps described in your RV owner's manual.
SECOND:
Contact a conveniently located recommended Suburban Service Center. Describeto 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
Customer Service Department
Post Office Box 399
Dayton,Tennessee 37321
[phone], Ext.
1
For future reference,you should recordthe following information
MODEL NUMBER
SERIAL NUMBER
STOCK NUMBER
DATEOF PURCHASE
PartNumber 203384
2-28-04