Airxcel Suburban SF-20F User manual

SUBURBANMANUFACTURING COMPANY
Post Office Box
399
Dayton, Tennessee 37321
a substdrary a( AIRXCEL,!nc.
SUBURBAN GAS FURNACES
INSTALLATIONINSTRUCTIONS
FOR MODELS
SF-20F SF-25F SF-30F SF-35F
Thedesignofthefurnace hasbeenlistedfor installation inrecreational vehicles only. In orderforthefurnace tooperate in conformity
with generally accepted safety regulations, the installation instructions must befollowed. Failure to comply with the installation
instructions will void thewarranty onthefurnace andanyresponsibility onthe partof Suburban ManufacturingCompany.
Thefurnacewasinspected beforeitleftthefactory. Ifanypartsarefoundtobedamaged,donotinstallthefurnace. Immediatelycontact
the transportation companyandfile a claim.
FOR YOUR SAFETY
WHAT TO DO IFYOU SMELL GAS:
Extinguish any open flame.
Evacuate all personsfrom 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 inthe vehicle.
Do not start the vehicle's engine or
electric generator.
Contact the nearest gas supplier or
qualified servicetechnician for repairs.
If you cannot reach a gas supplier or
qualified service technician, contact the
nearestfire department.
Do not turn on the gas supply until the
gas leak(s) has beenrepaired.
This book contains instructions covering the operation and
maintenance ofyour furnace. Keep with unitatall times.
Should
you require further information, contact your dealer or
nearest SuburbanService Center.
I FOR YOUR SAFETY 1
DO NOT STORE OR USE GASOLINE OR
OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR
WARNING! Improper installation,
adjustment, alteration, service or
maintenancecancause propertydamage,
personal injuryor lossof life. Referto the
installation instructions and/or owners
manual provided with this appliance.
Installation and service must be
performed bya qualified installer, service
agency or the gas supplier.
WARNING! Be sure the furnace and all
1
ignition systems are "OFF" during any
type of refueling and while vehicle is
in
motionor being towed.
INSTALLATION INSTRUCTIONS
WARNING! Installationof thisappliancemustbemadeinaccordancewith
thewritten instructions providedinthis manual. Noagent, representative
or employee of Suburban or other person has the authority tochange,
modify or waive any provision of the instructions contained in this
manual.
CAUTION: In any installation in which the vent of this appliance can be
covered duetothe construction of the RV orsome 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.
Thesefurnaces are designed and installed in such a manner as to beremovable
NOTE: These furnaces must beinstalled andvented as described in this manual
only from within livingarea of the recreational vehicle. so that the negative pressurecreated by the air circulating (return air)fan cannot
CAUTION: If possible, do not install the furnace towhere the vent can be affect the combustionair intake or venting of any other apphance. It is imperative
covered orobstructed when anydooronthe trailer isopened. If this is not that the products of combustionbeproperlyventedto thealmosphereandt!iat all
possible, then the travel of the door must be restricted inorder to provide combustion air supplied to burner be drawn from the outside atmosphere (See
a
6" minimum clearance betweenthefurnace vent andany door whenever Installing Vent Assembly)
the door isopened. NOTE: Do not install the furnace with the vent facing toward tha ionvard end of
NOTE-The exhaust temperature of this furnace could discolor or warp some the coach.
materials. You shouldverify that the material used on the coach door, panel, or
cover will not discolor or warp from the exhaust temperature whenever any door,
IMPORTANT- If this furnace is to be connected to a common duct systef:: also
panel, or cover is in the open position. se~inga cooling unit, a manualor automatic damper is required to prevent any
cold conditioned air from circulatina back into the furnace. Coldair ~assinaover
CAUTION: Duetothe differences invinyl siding, this appliance should not
thefurnacecombustionchamberd~ring theoperationof thecoolinciunitcarTresult
beinstalled onvinylsiding without firstconsultingwiththemanufacturer of inthe formation of condensation inside the furnace combustior: chamber This
the siding or cutting the siding away from the area around the appliance condensation may promote corrosion and premature failure
of the combustion
vent. chamber.
FormNo. 2555-C

NOTE These furnaces shall be installed so the electrical components are
protected frorn water.
These furnaces are design certified for propane1LP gas only. Do not attempt to
convert to natural gas.
Gas supply pressure tor purposesofinput adjustme~il
Minimum - 11"W C '
Maximum - 13" WC '
(W.C.' - Water Column).
In the U.S.A.. the installation of Ihe furnace must be In accordance with local
codes and regulations. In the absenceof local codes and regulations, referto tlie
latest edition of:
1. Standard for Recreat~onalVehrcles ANSl A-119 2lNFPA 501C
6. Install vent assembly (See instrtlctions forinstalling vent )
B. IF NOT INSTALLED AGAINST OUTER SKIN AND -x- DIMENSION
GREATER THAN 1-112"
1. Determine "x" dimensron as illustrated in F~gure2 Tube length for "x"
dimension are charted. Special tubes, if needed, must be ordered.
2. Locate center lines for exhaust and intake lubes as shown Figure 1 Cut two
2-3:4" diameter holes through coacli wall forexliausl and intake. (See Figure 2.)
3. Put furnace in place and secure furnace to cabmet.
4. Uslng the two #I0 x 314 stainless screws provided. fasten to floor of coacli
tlirougti two holes provided infront plenum area of furnacecabinet. (SeeFigure
1 .1
1. Standard CANICSA-2240 Recreational Veli~cles IF-20~ 1"
:ll ::: 0"
!\ 318"
2. CSA Standard CANICSA-2240 6 2-M86 Electrical Requirements for SF-25F l"
0" 0" 318"
Recreational Vehicles SF-30F 1" 0" 0" 0 0" 318"
3. Standard CANICSA-22404.2-M86 Installation Requirements for Propane SF.~~F 1,' 0 0" 0" 0" 318"
Appliances and Equ~pmentin Recreational Vehicles.
2. National Fuel Gas Code ANSl 2223 1
5 Installvenl assembly (See ~nstruct~onsfor Install~nqVent )
6 Rernstallcabinet front
3 Furnace must beelectrically grounded In accordance w~lhthe latest ed~tionof
4. CANICGA-6149 Installation Codes
5. Any applicable local codes and regulations.
the Nat~onalElectrrcal Code ANSIINFPA No 70
-NOTE-
0" MEANSTO SPACER BUMPS
Left Right Exhaust and
Model Front Srde S~de Top Bottom Back IntakeTube
InCanada the furnace must be lnslalled ~naccordance with
I AHLt 2
Thereare two (2)methods described below for installing the furnace.Regardless
This unit is equipped with an electric igniter device that has an energy
consumption of .1amp
@ 12volts DC
of the method you choose, we require that a permanent opening be prov~dedin
theinteriorcabinetryof thecoachdirectly ~nfront of the furnace. Theopening must
allowtorfree, unobstructed removalof the furnace. This opening may be usedas
a means of providing circulating return air to the furnace. Other openings may be
usedas well. It isimportant that adequate return air beprovidedto assure normal
heatingandoperation ofthe furnace.Failuretoprovide the minimumreturnair will
cause erratic furnacecycling Refer to the chart shown belowfor minimum return
air requirements.
NOTE-Returnair must be from within the livinq area ofthe coach
CLEARANCE FROM DUCTS TO
COMBUSTIBLEMATERIAL
- 114" (See Figure 3)
RETURN AIR
-. -. - -
INSTALLINGTHE FURNACE
Return Air Requirements
Model MinimumFree(unobstructed)Area
NOTE. Before installing the furnace
"X dimension as illustrated in Figure 2must
bedetermined.
SF-2OF125F/3OF/35F
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 tlie
cabinet to combustible construction as listed in Table 2 Refer to Figure 3 for
illustration of furnace clearances.
NOTE:Side and top clearances may be
"0 for through the wall installations up to
a maximum of 3" wall thickness. (See Figure 1.)
55 Sq. In
3. When an appliance isinstalled d~recllyon 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,other thanwood maybecut away the full
length and depth of the appliance plus the appliance minimum clearances to
combustibles. (See Table 2.)
TABLE 1
4. Determine "x" dimension as shown in Figure 2. The tubes supplied wlth the
furnace will accommodate an installation range for "x" from 1-112"
- 3" If "x"
dimension is less than 1-112" or greater than 3". then special vent tubes as
charted in Figure
2 must beordered.
WARNING! Do not alter. cut or otherwise modify
supplied by Suburban. Doina so could result in inadequate intake of
I combustion air or improper &ting of furnace exhaust. .
5. After determining "x" dimension, complete the furnace installation as follows.
A. IFINSTALLEDDIRECTLYAGAINST OUTER SKIN OR
"X" DIMENSIONIS
0 - 1-112"
1. Vent Kit 520597 must beordered. Do not cut or alter the vent tubes supplied
with the furnace.
2. Cut anopening through the inner wall 17-314x 8". Thls will allow the rearof the
furnace to be installed against the outer skln of the coacli. (See Figure 1
.)
3. Cut two 2-114''diameter holes through the outer skin of the coach, as shown
in Figure 1
INSTALLING VENT ASSEMBLY
The vent outlet must be installed so it is inthe same atmospheric pressure zone
as the combustion air intake.Theexhaust and intake tubes mustbeinstalled from
the outside, pass through the RV skin and slide onto the furnace exhaust and
intake.
WARNING! Donotalter thevent assemblysuppliedwith thisfurnace. Any
modificationswillresultinimproperinstallationwhichcouldcauseunsafe
furnace operation.
CAUTION! Combustionairmustnotbedrawnfromthe livingarea. Allair for
combustionmustbedrawnfromtheoutsideatmosphere. Allexhaust gases
mustbeventedtothe outside atmosphere
- never insidethe RV. Therefore,
itis essential to insurethat the vent cap and tube assemblies are properly
installed.
1. Applycaulkingto RV skin behindvent cap as shown inFigure
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.) Minimumtube overlap of 112" is required.
3. Insert venl cap exhaust tube through RV skin and slide it onto the furnace
exhaust (See Figure 2.) Minimum tube overlap of 1 114" is required.
4. Attach vent cap assembly to outer skin of RV with the six (6) screws provided.
Do not install vent assembly upside down. The words "Suburban" and "Dayton,
Tenn."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 benecessary to holdthe 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 testingofthat system at test pressure inexcess of 112 PSIG.
The appliance must be isolatedfrom the gas supply piping during any pressure
testing of the gas supply piping system at test pressure equal to or less than 112
PSIG.
1. Connect gas line to the 318" elbow at the front of the furnace. (See Figure 1 .)
Some standards may require the use of a manual shut off valve inthe gas line
external to the furnace cabinet
2. Inorderto maintainacheckofgas supplied pressureto the furnace, Sububan
advlses the installer to provide the 118" 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! Nevercheckforleakswithanopenflan~r.Turnonthe gas and
apply soapy water to all joints to see if bubbles are formed.
CONNECTING ELECTRICAL SUPPLY
4. Put furnace in place, making sure that rear of furnace cabinet is as close to
CAUTION: This furnace is
for negative ground 12 volt D.C, system
outer skin of coach as possible and still assure proper vent tube overlap. (See
only, Do not anempt to alter the furnace for a positive ground system or
InstallingVent Assembly.) Secure furnace to cabinet. (See Figure 1 .)
connectthe furnace directlvto115voltsA.C. Damaaetofurnacecom~onent
-
5. Us~nothe two #I0x 314 stamless screws ~rovldedfasten furnace to floor of Darts will occur.
coachtkoughthe two holes providedinthe frbnt area offurnace cabinet.
(See Figure 1
.)

Be sure all wiring to the furnace is of heavy enough gauge to keep the voltage 4. Inspect furnace, the venting, ducting and gas piping to furnace for obvious
drop through it to a minimumand to provide enough power forstart-upsurge No signs of deterioration. Correct any defects at once
12 gaugewire isrecommended Ifanyof the original wire that is supplled with the
appliance mustbereplaced,it must be replaced with type
105" Cor its equivalent
Power supply connections are to be onthe right side ofthe fuinace The wiresare
-
color coded, red for positive (+) and yellow for negatlve (-).,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 wired inparallel w~ththe battery
This will serve two purposes
1. Provide a constant voltage supply lo the furnace
2. Filter any A C. spikes or volt 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
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 becounted inthe requiredduct area.
8. Makethe duct connections atthe furnace cabinet tight. Looseconnections will
result inoverheating of the component parts on the furnace and a reductionof the
heated air flow through the duct system.
C. Avoid makinganysharp turns inthe duct system. Sharp turns will increase the
static pressureinthe plenum area and could cause the furnace to cycle.
D. Avold making a lot of turns Inthe duct system The
straighter the duct system.
,
the better the performance of the furnace
E. Maintain a minimum of 114" clearance where ducts pass through any
combust~bleconstruct~on,such as coach cabinetry (See Figure 3 ) NOTE UL
llstedduct 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 thefurnaceandductsystemiscompleted, adjustments
must be made to obtain a temperature rise within the range specified on the
Rating Plate. INSTALLINGTHERMOSTAT
Locate the roomthermostat approximately4-112feet above the floor onan 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. (Seewiring
diagram.)
PREVENTIVE MAINTENANCE
inwhich 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 inthis manual, then the risk of a fire
and/or the production of carbon monoxide exists which can cause
5. lnspect 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
6.)
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. 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
Llsted below are several safety related items that you should follow during the
heatlng season to assure continued safe operation of the furnace.
1. lnspect furnace venting Venting must befree of obstructions, void of soot, and
properly terminated to the atmosphere. (See Installing Vent Assembly.)
WARNING! Donot install screens over the vent for any reason. Screens
will becomerestrictedandcause unsafefurnace operation. Accessories
are being marketed for RV products which we do not recommend. For
your safety, onlyfactory authorizedpartsare tobe usedonyour furnace.
2.
Periodically inspect the vent for obstructions or presence of soot. Soot is
formed whenever combustlon 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 service person
3. Keepfurnace clean.Morefrequent cleaning maybe 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 or other
flammable vapor and liquids
6. Beforeoperating furnace, check the location of the furnace vent to makesure
it will not be blockedbythe opening of anydoor on the trailer. Ifit canbe 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 andlor 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 cigarettesandevacuate all persons from thevehicle.Shutoffgas
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, orthe gas supply fail to shut off,
shut off the manual gas valve to the appliance before shutting off the
electrical supply.
10. Never attempt 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 restricttheducting installedbyyour trailer manufacturer. Todosocould
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. Donot deviate from the step-by-step
CAUTION: Labelallwires
beforedisconnectingforservicing. Properpolarity procedures
mustbeobservedsothe furnace motor will runwith the proper direction of
rotation toinsurecorrect air delivery. (See wiring diagram). 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
CAUTION: Label all wires prior to disconnection when servicing controls. replace
any part of the control system and any gas control that has been
Wiring error can cause improper and dangerous furnace operation. submerged under water.
Always verify proper operationof furnace after servicing.
Your furnace should be inspected by a qualified service agency yearly before
turning the furnace on. Particular attention should be givento thefollowing items
1. lnspect furnace installation and vent termination to be sure furnace is properly
secured in place (see Installation Instructions), that vent terminates to the
atmosphere, andthat vent tubes overlapproperly(seeInstallingVent Assembly
)
2. lnspect chamber and venting to assure that these components are physically
sound without holes or excessive corrosion and that the installation andlor re-
installationis inaccordance with Suburban's installation instructions. (Reference
installationmanualsupplied with furnace.)
WARNING! Itis imperative that the products of combustion be properly
vented toatmosphere 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
17. Whenconsideringadd-onrooms, porchor patio, attentionmustbegiventothe
venting of your furnace. Foryour safety, do notterminate furnace vent inside add-
on rooms, screen porch or onto patios. Doing so will result in products of
combustion beingvented into the room or occupied areas.
18. Inanyinstallation inwhich the vent of this appliance canbecovereddue tothe
construction of the RV or some special featureof 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.
INSTALLATION AND REMOVALOF UNIT
TO REMOVE
1. Disconnect power supply at furnace
2. Removevent cap assembly.
3. Disconnect gas connections

4. Remove cabinet front (2 screws). TO SHUT DOWN
5. Removet~e-downscrew fromcenter ofunit and remove furnacefrom cabinet
1. Set the thermostat to lowest settlng. then move lever to "OFF'. position.
TO INSTALL
2. Turn manual shut offvalve (if so equipped) to the "OFFposition Do not force.
1. Slide unit into cabinet NOTE:Care must be taken inroutlng wlrlng to back of
cabinet and outside of cabinet
2. Reinstall tie-down screw, securlng chamber assembly to cablnet
3. Reinstall cabinet front.
4. Connect gas line
5. Check gas connections for leaks usingasoap and water solution Correct any
gas leaks immediately.
6. Reinstall vent cap assembly.
7. Reconnect power supply.
OPERATING INSTRUCTIONS
WARNING! Do not operate furnace while vehicle is in motion or being
towed.
NOTE: During initial firing of this furnace, a burn-off of excess paint and oils
rema~ningfrom manufacturing process maycause "smoking" for 5 - 10minutes
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
delaywill occur before the blowercomes on. Allow blower to runfor
5 minutes for
combustion chamber purge cycle.
4. After 5 minutes, move thermostat lever below room temperature. Blower will
remain on Wait approximately 2 mlnutes for blower to go off.
5. Openmanualshut-off valve (if so equipped)or the valve at the outslde LPtank.
Correctoperating characteristics depend on the valve beingpositioned fullyopen.
Never attemot to ooerate with a valve oartiallv closed. NOTE-This furnace is
ELECTRODE ADJUSTMENT
For consistent ~gn~tlonofthe burner. 11 IS Importantthat theelectrode beposlt~oned
properly over the top ofthe burner The electrode was set at the lactory for proper
~gnltlonand should not need further adjustment. however. if you should
experience lnconslstent lgnltlon, reposlt~onelectrode as follows
Equipment needed:
flashlight
black felt-tip pen
needle-nose pliers
rneasurlng tape
NOTE: Furnace must be removed (See instructions for removing unit.)
1. Remove burner lrom 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 Inthe venturi of the burner and shine through
a portionof the two
(2) rolls of burner ports in the top of the burner.
c. 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 probeis positioned alongthe 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
4.)
5. IMPORTANT: Besureelectrodeprobemaintains a 118" sparkgapoverthe
burneras illustrated.
equipped with a valbe shut-off switch, with swikh in"OFFposition. Gas will not
6. ~~~~~t~llthe furnace into the
following the instructions in the manual,
flow to burner nor will the furnace operate.
6. Set thermostat leverto desired setting. If set above room temperature, blowel
will come on.
7. Allow 30 seconds for main burner to light after blower comes on.This furnace
is equipped with an ignltion device which automatically lights the burner 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.
1
FRONT
Figure1

SF-20F. . . .. .. . S<;2SF,~SF-30F2.-SF~35F. ZF-42F. . STANOAKD dENT INSTALLATION
TRAILER SKIN
W
a
+
L
52
C1
+
'7
3 a
1 X
\-VENT CAP
- - . - . - -. .-
" DrHENslnN - _E~~~~~~~'~!.
+NE~ER INSTALL THE EXHAUST TUBE
0' TO 1 1/2. 520767 VITH LESS THAN 1 1/4' OVERLAP. OR
THE ZtJTAYE TUBE YiTH LESS THAN
3'10..., . _
520768 ~ ~~~
112' OVERLAP.
4 1/2' TO
7 I/?' 520769
7 I/?' TO
9' 520551
LP.....
*STANDARD VENT ASSEMBLY FURNISHED YliH FURNACE SPECIAL EXTENSICN TUBES, IF
NEEDED. MUST BE ORDERED SEPARATELY EXTENXION <IT: GOHE VlTH COMPLETE
INSTALLATION INS IKUCTlONS.
Figure 2
HAINTAIN A 1/4' INCH CLEARANCE
VIiERE DUCTS PASS THROUGH
A CLBINET VCLL UL LISTED DUCT
Figure 3 Figure 4
Figure 5

TO CLEAN THE CHAMBER. THE FURNACE MUST BE RiMOVED FROM
THE CABINET AND THE MANIFOLD BLOWER ASSEMBLY AND CONTROLS
REMOVED LEAVING THE CHAMBLK m, as SHOWN USING
COMPRESSED AIR. BLOW THROUGH THE CHSMBER, AS 5IIOWI.I BY
ARROVS, TO REMOVE SOOT UR LUUSE DEBRIS
Figure 6
Figure 7
Figure 8
3'2
Figure 9

REPLACEMENT PARTS LIST
Only factory authorized parts are to be used . Do notaltempt to repair defective
Item
NO
.
1
When orderlngrepa~rpansfromyour dealsr a Suburban Sewlce Center.ordlslr~butor
.
always glve the Iollow~ng~nlormal~on
1. Pan Number (Not llemNo )
2 . Pan Descr~pl~on
3. Model and Serlal Number ol lurnace
4. Number of Pans Requ~red
Description
Cablnet Fronl Assembly ................
Thermostal .....................
Screw 810 x 314 (2 Requ~red) ....
Screw ir8 x 318 (2 Requ~red) ... . .
......
Cabinet Assembly (SF-~OFISF-~~F;SF-~O~only]
...............
Cablnet Assembly (SF-35F only)
. ........................... Cover Duct
Collar
. Duct .............................
Nut 8-32 Keps ..........................
Manifold Assembly Complete ....................
........................
Screw #8 x 318 (9 Required)
Or~lice . Main Burner (SF-2OF) .......................
Orilice . Main Burner (SF-25F) .......................
Orifice . Main Burner (SF-30F) ........................
Orif~ce.Main Burner (SF-35F) .........................
Gasket . Burner Access Cover ...................
Tinnerman .....................................
Plate . Secondary Air (Top-Back Half) (SF-20FISF-25FlSF-30F) .
............Plate . Secondary &r (Top-Back Half) (SF-35F)
Screw 6%-18 x 112 Stainless .......................
Plate . Secondary Air (Top-Front Hall)(SF-20FlSF-25FlSF-30F)
............. Plale . Secondary Air (Top-Front Hall) (SF-35F)
Screw #8-18x 112 Stainless 12 Reauired) .................
Part
Number
101242
161154
121853
. . 120158
. 101889
101893
050733
. . 050715
121694
. . 171596
. . 120158
. . 180305
180306
... 180307
. 180308
... 070811
. 121704
. . 063198
18 Screw U8-18x 112 Stainless (2 ~equiredj
.................... 121651
19 Plale
. Secondary Air (Bottom)(SF-20FISF-25FISF-30F) ......... 062935
Plate
. Secondary Air (Bottom) (SF-35F) .................. 062938
20 Screw 88-18x 112 Stainless (2 Required)
..................... 121651
21 Screw #8-18x112 Stainless
.............................. 121651
22 Electrode
.............................................. 232286
23 Burner Assembly Complete (SF-2OF)
..................... 010767
Burner Assemblv Comolete (SF-25FI
....................... 010762
Burner Assembl; ~omb~ete
SF-~oF~sF-~~F) ................. 010865
24 Grommet
............................................. 070963
<~r :>:
25 Screw #a-18x 112 Stainless ............................... 121651
ed 26 Valve ................................................. 161122
. .................................. ~9 27 Pioe Assemblv Gas Inlet 171576
\/ . ~
28 Screw #8-18x 112 Self-Drilling ............................ 121587
29 Gas Fining 90' Elbow
.................................... 170374
30 Screw 110x 314 (6 Required)
............................... 121853
31 Vent Cap and Exhaust Tube Assembly
.................... 260231
32 Tube Assembly Intake (Vent)
............................... 051249
33 Screw #8x 112 (8 Required)
................................ 120615
llem Part
Description Number
Combust~onAir Housing Assembly (Front Hall) ............... 390852
Screw U8-18
x 2 114 (4 Reoutredl ................... 121929
............................
Screw d6-19 x 112 (7'~equ;red) 121928
................ Combust~on Air Hous~ng(Rear Half) (SF.20) 390849
Combusl~on Air Housing (Rear Hall) (SF-25130135142) ........... 390848
........................... Wheel . Combust~onAir (SF-20) 350189
......................Wheel . Combusl~onAir (SF-25130135) 350184
Wheel
. Combustion Air (SF-42) .............................. 350183
Gasket
. F~rewall(CombustionAir) ... 071084
.............
Motor Assembly wthGaskel (SF-20125130j : '' : ............... 232682
Motor Assembly wth Gasket (SF-35)
....................... 232684
Motor Assembly wthGasket (SF-42)
........................ 232683
Screw
# 4-20 X 518 (2 Required) ........................... 121945
Blower Assembly (Roomkr)Front Half (SF.20. 25
. 30.35) ....... 390872
Blower Assemblv /RoomAir) Front Hall (SF-42)
................ 390873
. .
Screw li8.18 X 1.12 (4 ~equiied) ........................ 121857
Blower Housing (Room
Air) Rear Halt .................... 390851
Swtch.Sa~l ..................................... 232261
Screw 86-19
X H (4 Required) ........................ 121928
ScrewU6.19 X % (1 Required) ........................... 121928
Svitch ON1OFF ...................................... 232351
Bracket
. ONIOFF Switch ............................. 063446
ModuleBoard ...................................... 520820
Insulator Cap
. Module Board Coll ....................... 070973
Blower Wheel Assy (Room
Air) ....................... 350129
Screw dB-18
X !'2 ............................ 121857
Bush~ng,Universal .................................. 070362
Screw#8-18X112 ..................................... 121857
Bushing
. Strain Relief ................................ 231809
Gasket
. Firewall (Chamber Side) ............................ 070808
Chamber Assy
. F~nal(SF-20 . 25.30 . 35) .................. 021149BK
Chamber Assy Flnal (SF-42) ............................ 021150BK
Switch, Limil (SF-20) ................................... 232503
Smlch . Limit (SF-25. 30.35) ............................ 232504
Smlch, Lim~l(SF-42)
.................................. 232505
Screw #8
X 318 (2 Required) .............................. 120158
ScrewU8X318 .......................................... 120158
Firewall .............................................. 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 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 establish the warrantyperiod. Suburban does not usewarranty registrationcards for its standard warranty. You are required
to furnish proof of purchase date through a Bill of Sale or other payment records.
Suburban will replace any parts that are found defective within the first two years and will pay a warranty service allowance directly to the
recommended SuburbanServiceCenter at rates mutuallyagreed upon between Suburbanand its recommendedservicecenters. Replacement
parts will be shipped FOB the shipping point within the Continental United States, Alaska and Canada to the recommended service center
performinqsuchrepairs.All freight,shippingand deliverycostshallbethe responsibilityoftheowner. Theexchanqedpartor unitwillbewarranted
for only the unexpi;ed portionojthe original warranty. Beforehavin~warranty repairsmade,confirm that the se6ice'aRencyis a recommended
service center for Suburban. DO
NOT PAY THE SERVICE AGENCY FOR WARRANTY REPAIRS; SUCH PAYMENTS WILL NOT BE
REIMBURSED.
Part Number 203566
8-24-04
For warranty service, the ownerluser should contact the nearest recommendedSuburbanService Center, advisingthem of the modeland serial
numbers (locatedon the furnace) and the nature ofthe defect. Transportationofthe RV to and from the Service Center and/or travel expenses
of the ServiceCenter to your location is the responsibilityof the ownerluser. A current listingofrecommended service centers may be obtained
from Suburban's website,www.rvcomfort.com. If youcannotlocatea recommendedservicecenter locally, theserviceagencychosento perform
warranty repairsmust contact our Service Department at 423-775-2131for authorizationbefore makingrepairs. Unauthorizedrepairsmade 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 materialandworkmanship duringthe thirdthrough fifthyear after the
dateof originalpurchase. A replacement heat exchangerwill be providedunderthe sameconditions as stated in thetwo year warranty EXCEPT
no labor reimbursementwill be provided.
LIMITATION OF WARRANTIES
ALL IMPLIEDWARRANTIES (INCLUDINGIMPLIEDWARRANTIES OF MERCHANTABILITY)ARE HEREBYLIMITEDINDURATIONTOTHE
PERIOD FORWHICH EACHLIMITEDWARRANTY ISGIVEN. SOME STATESDO NOTALLOW LIMITATIONSON HOW LONGAN IMPLIED
WARRANTY LASTSSOTHEABOVELIMITATIONSMAYNOTAPPLYTOYOU.THE EXPRESSEDWARRANTIES MADEINTHISWARRANTY
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. Normalmaintenanceas outlined inthe installation, operatingand serviceinstructionsowner's manual includingcleaning of component parts;
such as, orifices and burners.
2. Initial checkoutsand subsequent checkouts which indicatethe furnace is operating properly, or diagnosiswithout repair.
3. Damageor repairs requiredas a consequence of faulty or incorrect installationor application not inconformancewith Suburbaninstructions.
4. Failure to start and/or operate due to loose or disconnectedwires; water or dirt incontrols, fuel lines and gas tanks; restrictionor alteration
of return air circulation; low voltage.
5. Routine adjustments that may be required to the thermostat, electrode and burner.
6. Costs incurred in gainingaccess to the furnace.
7. Parts or accessories not supplied by Suburban.
8. Freightcharges incurred from parts replacements.
9. Damageor repairs needed as a consequence of any misapplication,abuse, unreasonable use, unauthorizedalteration, improper service,
improper operationor failure to provide reasonable and necessary maintenance.
10. Suburban productswhose 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. Damageas a resultof floods, winds, lightning, accidents, corrosive atmosphereor other conditions beyondthe control of Suburban.
13. ANY SPECIAL, INDIRECT OR CONSEQUENTIAL PROPERTY, ECONOMIC OR COMMERCIAL DAMAGE OF ANY NATURE
WHATSOEVER. Some states do not allow the exclusionof incidentalor consequentialdamages, so the above limitation may not apply to you.
NO REPRESENTATIVE, DEALER, RECOMMENDED SERVICE CENTER OR OTHER PERSON IS AUTHORIZED TO ASSUME FOR
SUBURBAN MANUFACTURINGCOMPANYANY ADDITIONAL, DIFFERENTOR OTHER LIABILITY INCONNECTIONWITH THE SALE OF
THIS SUBURBAN PRODUCT.
This warranty gives you specific legal rights, and you may also have other rightswhich 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'swarranty,followthe steps suggested by your dealeror manufacturer
of the RV.
SECOND:
Contact a conveniently located recommendedSuburban ServiceCenter. Describeto them the nature of your problem,makean appointment,
if
necessary, and provide for deliveryof your RV to the selected service center.
THIRD:
For the locationof the nearest service center, refer to the listing providedor contact:
Suburban ManufacturingCompany
Customer Service Department
676 BroadwayStreet
Dayton,Tennessee 37321
[phone],
EX^. 1
For future reference,you should recordthe following information
MODEL NUMBER
SERIAL NUMBER
STOCK NUMBER
DATE
OF PURCHASE