Suburban DYNATRAIL NT-40 User manual

uburban
Manufacturing Company
ms
a subsidiary of AIRXCEL, I~c.
n
DY NATRAI L
INSTALLATION INSTRUCTIONS
FOR MODEL
SUBURBAN MANUFACTURING COMPANY
PostOffice Box399
Dayton, Tennessee 37321
The design of this furnace has been certified 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 instructionswillvoidthewarranty onthefurnace and anyresponsibility onthepartofSuburbanManufacturing Company.
Thefurnacewasinspectedbefore
it leftthefactory. Ifanypartsarefoundto bedamaged, donotinstallthefurnace. Immediatelycontact
the transportation company and file a claim.
FORYOUR SAFETY
WHAT TO DO IFYOU SMELL GAS:
Extinguish any open flame.
Evacuateall persons from the vehicle.
Shut off the gas supply at the gas
container or source.
Do nottouch anyelectrical 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 service technician 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 been repaired.
This book contains instructions covering the operation and
maintenance ofyourfurnace. Keepwith unitatall times.
Should you require further information, contact your dealer or
nearestSuburban Service Center.
FORYOUR 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
maintenancecancausepropertydamage,
personal injury or loss of life. Refertothe
installation instructions and/or owners
manual provided with this appliance.
Installation and service must be
performed bya qualified installer, service
agency orthe gas supplier.
WARNING! Be sure the furnace and all
ignitionsystems are "off" during any type
of refuelingandwhile vehicle is inmotion
or beina towed.
INSTALLATION INSTRUCTIONS
WARNING! Installationofthisappliance mustbemadeinaccordancewith
thewritteninstructions provided inthismanual. Noagent, 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.
NOTE: This furnace must be installed and ventedas 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 productsofcombustion be properlyvented to the atmosphereand that all
combustion air supplied to burner be drawn from the outside atmosphere. (See
'Installing Vent Assembly'.)
CAUTION: Ifpossible, do not install the furnace to where the vent can be NOTE: This furnace shall be installed so the electricalcomponents are protected
covered or obstructed when any door on thetrailer is opened. Ifthis is not from water.
possible, then the travel of the door must be restricted in orderto provide
a
6" minimum clearance between the furnace vent and any door whenever
the door isopen.
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: Dueto the differences invinyl siding, this applianceshould not
beinstalledonvinyl siding withoutfirstconsultingwiththe 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 duetothe constructionofthe RVor some specialfeature ofthe RV
such as slide out, pop-up, etc. always insurethat 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.
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 fumace. Cold air passing over
thefurnacecombustion chamberduring the operationofthe cooling unitcanresult
in the formation of condensation inside the fumace combustion chamber. This
condensation may promote corrosion and premature failure of the combustion
chamber.
Thisfurnace isdesign certified for PropanelLPgasonly. Donotattempt to convert
to natural gas.
Gas supply pressure for purposes of input adjustment:
Minimum
- Il" W.C.^ Maximum
- 13"W.C,'
(W.C.' - Water Column)
Form No. 2511-C

SUBURBANMANUFACTURING COMPANY
PostOffice Box
399
Dayton, Tennessee 37321
a subsidiary of AIRXCEL, Inc.
DYNATRAIL
INSTALLATIONINSTRUCTIONS
FOR MODEL
NT-40
The design of this furnace has been certified 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 willvoidthewarrantyonthefurnace andanyresponsibility onthe partofSuburban ManufacturingCompany.
Thefurnacewasinspectedbeforeitleftthefactory. Ifanypartsarefoundtobedamaged, donotinstallthefurnace. Immediately contact
thetransportation company and file a claim.
FOR YOUR SAFETY
WHAT TO DO IFYOU SMELL GAS:
Extinguish any open flame.
Evacuate a.llpersons from the vehicle.
Shut off the gas supply at the gas
container orsource.
Do nottouch any electrical switch, oruse
any phone or radio inthe vehicle.
Do not start the vehicle's engine or
electric generator.
Contact the nearest gas supplier or
qualifiedservice technician 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
aas leak(s) has been re~aired.
This book contains instructions covering the operation and
maintenance ofyour furnace. Keep with unit atall times.
Should you require further information, contact your dealer or
nearest Suburban ServiceCenter.
FOR YOUR SAFETY
I
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'propertydamage,
personal injuryorloss oflife. Refer tothe
installation instructions andlor owners
manual provided with this appliance.
Installation and service must be
performed bya qualified installer, service
agency orthe gas supplier.
ignitionsystems are "off" during any type
ofrefuelingandwhile vehicle is inmotion
INSTALLATION INSTRUCTIONS
I
WARNING! Installationofthis appliancemust bemadeinaccordancewith
the written instructions providedinthis manual.Noagent, representative
I
I
or employee of Suburban or other person has the authority to change,
modify or waive any provision of the instructions contained in this
manual.
CAUTION: If possible, do not install the furnace to where the vent can be
covered or obstructedwhen any door onthe trailer is opened. Ifthis is not
possible, then the travel ofthe door must be restricted inorder to provide
a
6" minimum clearance betweenthe furnace vent and any door whenever
the door isopen.
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 temperaturewhenever any door,
panel,or cover is inthe open position.
CAUTION: Due to the differences in vinyl siding, this appliance should not
beinstalled on vinylsidingwithoutfirst consulting withthe manufacturerof
the siding or cuffing the siding away from the area around the appliance
vent.
CAUTION: In any installation in which the vent of this appliance can be
coveredduetothe construction ofthe
RV orsomespecialfeatureofthe 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.
NOTE:This fumacemust be installedand ventedas describedin this manual so
that the negative pressure created by the air circulating (return air) fan cannot
affect the combustionair intake or venting of any other appliance. Itisimperative
thatthe productsof combustionbeproperlyventedto the atmosphereandthat all
combustionair supplied to burner be drawn from the outside atmosphere. (See
'InstallingVentAssembly'.)
NOTE: Thisfurnace shall be installedso the electricalcomponentsare protected
from water.
IMPORTANT: If this furnace is to be connectedto a common duct systemalso
servinga cooling unit, a manual or automaticdamper is requiredto preventany
cold conditionedair from circulating back into the fumace. Coldair passingover
the furnacecombustionchamberduringthe operationof thecoolingunitcan result
in the formation of condensation inside the furnace combustion chamber. This
condensationmay promote corrosion and prematurefailure of the combustion
chamber.
Thisfurnaceisdesigncertifiedfor PropanelLPgasonly. Donotattempttoconvert
to naturalgas.
Gas supplypressurefor purposes of inputadjustment:
Minimum
- 11" W.C.' Maximum
- 13" W.C,*
(W.C.' -Water Column)
Form
No. 2511-C

In the U.S.A., the installation of the furnace must be in accordance with local
codes and regulations. Inthe absence of local codes and regulations, refer tothe
latest edition of:
1. Standard for RecreationalVehicles ANSI A-119.21NFPA 501C.
2. National Fuel Gas CodeANSI 2223.1.
3. Furnace must be electricallv arounded in accordance with the latest
edition of the National ~lectridaltodeANSllNFPA No. 70
This unit is equipped with an electric ignitor device that has an energy
consumption of
.l amp (912 volts D.C.
.
In Canada, the furnace must be installed in accordan& with:
1. Standard CANICSA-Z240 Recreational Vehicles.
2. CSA Standard CANICSA-Z240.6.2-M86 Electrical Requirements for
Recreational Vehicles.
3. Standard CANICSA-Z240.4.2-M86 Installation Requirements for Propane
Appliances and Equipment in Recreational Vehicles.
4. CANICGA-El49 lnstallation Codes.
5. Any applicable local codes and regulations.
ReturnAir
There are three methods described below for installing the furnace. Regardless
of the method you choose, we require that a permanent opening be provided in
theinterior cabinetry of thecoach directly infront of thefurnace. Theopening must
allow for free, unobstructedremoval of the furnace. This opening may be used as
a means of providing circulating return air to the furnace. It is recommended that
the opening total 64 square inches. Suburban also recommends a return air
opening of 49 square inches be provided in the left side of coach cabinetry and
centered by room air blower opening. (See Figure 3.) These are suggested
locations for returnair. Other locations and areas may beused. Regardless of the
localion for return air, the return air to the furnace must total 113square inches.
(See Figure 3.)
It is important that adequate return air be provided to assure normal heating and
operation of the furnace. Failureto provide the minimumreturn airopeningaswell
as an adequate opening for iurnace removal, voids the warranty.
A. INSTALLATIONDIRECTLY AGAINST OUTER SKIN OF COACH
(See Figure 1)
( Maximumwallthickness for this type installation is 2 114".
1. Locate the fumace near lengthwise center of the coach Do not install the
iurnacewith the vent facing toward the forward end 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 constructions listed in Table 1. Refer to Figure 3 for
illustrationof fumace clearances.
NOTE: Side and top clearances may be
0 for through the wall installations up to
a maximum wall thickness of 2 114". (See Figure 1.)
3. When an appliance is installed directly on carpeting, tile or other combustible
material, other thanwood flooring, the appliance shall be installed on a metalor
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 thefull
length and depth of the appliance plus the appliance minimum clearances to
combustibles. (See Table 1
.)
4. Cutan openingthroughthe inner wall 127116 x 13 118". This will allow the rear
of the fumace to be installed against the outer skinof the coach. (SeeFigure 1.)
5. Cut two 3" diameter holes through the outer skin of coach as shown in
Figure 1.
6. Put furnace in place, making sure that rear of furnace cabinet is as close to
outer skin of coach as possible and still assure proper vent tube overlap. (See
Installing Vent Assembly).
7. Fastenfurnaceto floor of coach using the two (2) holes provided in the front
plenum area of furnace cabinet. (See Figure 1
.)
8. Installvent assembly. (See instructions for installing vent.)
Left Right Exhaust and
Model Front Side Side TOD Bottom Back Intake Tube
NT-40 1" 2"
2" 1" 0" 0" 318"
- NOTE -
0" MEANS TO SPACER BUMPS
CLEARANCE FROM DUCTS TO
COMBUSTIBLE MATERIAL WITHIN
FIRST
3 FEET FROM FURNACE - 114"
(See Figure3)
TABLE 1
B. INSTALLATION DIRECTLY AGAINST INNER WALL OF COACH
(SeeFigure 2)
Maximumwall thickness for this type installation is 2 114".
1. Locate the furnace near lengthwise center of the coach. Do not install the
furnacewith the vent facing toward the forward end of the coach.
' 2. Choose a location for installation out oithe 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
1. 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 extending the full width and depth of the appliance. If preferred, the
carpeting, tile or combustible materials, other than wood may be cut awaythefull
length and depth of the appliance plus the appl~anceminimum clearances to
combustibles. (See Table 1
.)
4. Locate centerlinesfor exhaust and intaketubes as shown in F~gure2. Cut two
3" diameter holes through coach wall for exhaust and intake. (See Figure 2.)
5. Put furnace in place, making sure that rear of furnace cabinet is as close to
inner wall of coach as possible and still assure proper vent tube overlap. (See
Installing Vent Assembly).
6. Fastenfimace to floor of coach using the two holes provided in front plenum
area of furnace cabinet. (See Figure 1
.)
7. Install vent assembly. (See instructions for installing vent.)
C. INSTALLATION USING VENT EXTENSION TUBES
When it is not possible to install the furnace as described in installations A or B,
extension tubes must be used to extend the exhaust and intake tube to the vent
tube assemblies on the outside of the coach.Avoid the use of extension tubes
whenever possible. If they must be used, it is important that the correct length
tubes are used.
Inorder to determine the correct extensiontubekit,you mustdetermine the range
in which the extension falls. To do this, determine where the furnace is to be
installed and measure the distance from the end of the exhaust and intake tube
totheouteredge of the coach skin. This determines theextension tube range you
need. Table 2 lists by kit number the vent extension range up to
9".
Example: Ifthedistance you measured is 2 718". usingTable2 asyourguide,you
will order Kit #520593 which accommodates
a range from 2 114" to 3 118". The
extension tube kit comes with complete installation instructions.
WARNING! Under nocircumstances aretheextension tubes, as supplied
bySuburban, to becut, altered, or modifiedinany way. To dosocould be
dangerous and will void the responsibility of Suburban Manufacturing
Cornoanv.
EXTENSION TUBE MIN./MAX. LENGTH
KIT NUMBER (EXTENSION TUBE RANGE)
TABLE
2
INSTALLING VENT ASSEMBLY
The vent outlet must be installed so itis in the same atmospheric pressure zone
asthe combustion airintake. The exhaustand intaketubes must be installed from
the outside, pass through the RV skin and slide onto the furnace exhaust and
intake.
WARNING! Donotalter theventassembly supplied with this furnace. Any
modificationswillresultinimproperinstallationwhich couldcause unsafe
1
I furnace operation.
CAUTION!Combustion air mustnotbedrawn from thelivingarea. Allairfor
combustion mustbedrawn fromtheoutsideatrnosphere.Al1 exhaustgases
mustbeventedtothe outside atmosphere
- neverinsidethe RV. Therefore,
it is essential to insure thatthe vent cap and tube assemblies are properly
installed.
1.Apply caulkingto RVskinbehindventcap asshown in Figure 2. Apply caulking
generously around perimeterof vent cap and across center as shown.
2. Insert intake tube through RV skin and slide it onto the furnace intake (See
F~gure2.) Minimumtube overlap of 112" is required.
3. Insertthe vent cap assembly with heat shield collar through the 3" diameter
hole in the RV skin as illustrated in Figure
2. Slide vent cap exhaust tube onto
furnace exhaust. Minimum tube overlap of 1 114" is required.
4. Attach vent cap assembly to outer skin of RVwith 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:
NOTE: The compound used on threaded joints must be resistant to liquefied
petroleum
(LP) gas.
NOTE: The appliance must be disconnecled from the gas supply p~pingsystem
during any pressure testing ofthat systemattest pressureinaccess of 112 PSIG.
The appliance must be isolated from the gas supply piping during any pressure
testing of the gas supply piping system at test pressureequal to, or lessthan, 112
PSIG.
1. Be sure that the gas fitting is outside of the furnace jacket and easily
accessible. (See Figure 1
.) The fittingmay be connected directly to the 90" elbow
at the gas inlet to the furnace.
2. After the furnace has been connected to the gas supply, all joints must be
checked for leaks.
WARNING! Nevercheck for leaks with an openflame. Turn onthegas and
apply soapy water to alljoints to see if bubbles are formed.

CONNECTING ELECTRICAL SUPPLY 6. lns~ectall aaskets. If anv aaskets show sians of leakaae or deterioration,
CAUTION: This furnace isdesignedfor negative ground
12 voltD.C. system
only. Do not attemptto alter the furnace for a positjve ground system or
connectthefurnace directlyto
115 voltsA.C. Damagetofurnacecomponent
parts will occur.
Be sure all wiring to the furnace is of heavy enough gauge to keep the voltage
drop through itto a minimum. No. 12 gaugewire is recommended. Ifany of the
original wire that is supplied with the appliance must be replaced, it must be
replacedwith type 105°C or its equivalent.
Connectthe power supply to red and yellowwires on left side of the fumace,
he
wires arecolor coded, red for positive (+) andyellowfor negative (-). This polarity
must beobservedso thefurnace motorwillrunwith theproperdirectionof rotation
to insure correct air delivery. (See wiring diagram.)
If the furnace power supply is to be from a convertor, we recommend that the
convertor system used to powerthe furnace bewired in parallelwith the battery.
This will service two purposes.
1. 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 followed in order to assure proper
operation of the furnace.
1. Maintaina minimum of 48 squareinchesopenductareathroughoutentireduct
system includingthrough register.(Minimum4 ducts
- 4" diameter.) Applicable to
under floor ducting aswell.
NOTE: Ducts terminating in a dead air space (like holding tank
compartments) with no means for return air recirculation should not be
counted inthe required duct area. Also, ducts
2" in diameter or smaller
should not be counted inthe required duct area.
2. Maketheduct connectionsat the furnacecabinet tight. Loose connectionswill
resultinoverheatingofthecomponentpartson thefurnace anda reductionof the
heated air flow through the duct system.
3. Avoid making any sharp turns in the ductsystem.Sharp turnswill increase the
static pressurein the plenum area and could cause the furnace to cycle.
4. Avoid makinga lot ofturns in the duct system.The straighter theduct system.
the betterthe performance of the furnace.
5. Maintain a minimum of 114" clearance where ducts pass through any
combustible construction: such as, coach cabinetry. (See Figure
3.) NOTE: UL
listed duct materials can be
"0" clearance.
6. Do not install air boosters in the duct system. Such devices will cause the
fumace to cycle on limit and cause erratic sail switch operation.
,
NOTE:After installationofthefurnaceand ductsystemiscompleted,adjustments
must be made to obtain a temperature rise within the range specified on the
, Rating Plate. INSTALLINGTHERMOSTAT
Locate the roomthermostat approximately4 112 feet above thefloor onan inside
bulkhead where it is not affected by heat from any source except room air.
Connect thermostat wiring to the white wires on right side of furnace marked
"Thermostat Wires". (See wiring diagram.)
PREVENTIVE MAINTENANCE
inwhich itwas 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
andlor the production of carbon monoxide exists which can cause
CAUTION: Labelallwiresbeforedisconnectingforservicing. Properpolarity
must beobserved sothe furnace motor will runwith the properdirectionof
rotationtoinsure correct air delivery. (See wiring diagram).
CAUTION: Label all wires prior to disconnection when servicing controls.
Wiringerror can cause improper and dangerous furnace operation.
Always verify proper operation offurnace afler servicing.
Your furnace should be inspected by a qualified service agency yearly before
turning the furnaceon. Particularattention should begiventothefollowingitems:
1. lnspect furnaceinstallation and venttermination to be sure furnaceis properly
secured in place, (See Installation Instructions), that vent terminates to the
atmosphere,andthatventtubesoverlapproperly. (SeelnstallingVentAssembly.)
2. lnspect chamber and venting to assure that these components are physically
sound, without holes or excessive corrosion and that the installation andlor
reinstallationisinaccordancewithSuburban'sinstallationinstructions.(Reference
installation manual supplied with fumace.)
WARNING! Itis 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 physicallysound,
,,
void of any sagging, deterioration,etc.
4. lnspect furnace, the venting, ducting and gas piping to furnace for obvious
-
signs of deterioration. Correct any defects at once.
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 expelledto the outside atmosphere not be obstructed. Any soot or loose
debris should be blown out using compressed air. (See Figure
7.)
repladethem. safe operatio; c? 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, asthe ownerluser, should inspect the furnace periodically during the
heatingseason for presence of soot on vent. Operating the furnace under this
condition could lead to serious propertydamage, personalinjuryor 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 fumace.
1. lnspectfurnaceventing.Venting must be free ofobstructions,voidofsoot,and
properlyterminated to the atmosphere. (See lnstalling Vent Assembly.)
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, only factory authorized partsare to be usedonyour 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, immediatelyshut
furnace down and contact your dealer or a qualified service person.
3. Periodicallyobserve the main burner flame to assure it is burningwith ahard
blueflamewith well defined burnerports. (See Figure
6). Ifflame appearsyellow
or burner has a lazy flame, shut furnace down. It is possible that burner needs
cleaning or replaced.To inspect the main bumer, removethe four (4) screws (A,
B, C and D) securing the burner access door to the combustion chamber (See
Figure 5). If excessive rust and corrosion are present on bumer surface, the
burnermustbethoroughlycleanedor replaced.The burnermaybecleanedusing
asteelwire brushand blownclean using highcompressionair.Contact aqualified
service personfor assistance.
NOTE:Toobserveflame, cabinet front mustberemoved.Operationof burnercan
then beobservedthroughtheviewingwindowon frontof chamber (See Figure5).
4. Keepfurnaceclean. Morefrequentcleaning maybe requireddue to excessive
lint from carpeting, bedding material, etc. It is imperative that control
compartments, burners and circulating air passagewaysof the appliance bekept
clean.
5. The motor is permanently lubricated and requires no oiling.
6. Keep the fumace area clear of any combustible materials, gasoline or other
flammable vapor and liquids.
7. Beforeoperating furnace, check the location of the fumace vent to makesure
itwill not be blocked by the opening of any dooron the trailer. Ifitcan beblocked,
do not operatethe furnace with the door open.
8. 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.
9. Never operate the fumace 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 includingcigarettesand evacuateallpersonsfromthevehicle. Shutoffgas
supply at LP gas bottle. (See safety notice on front cover of this manual.)
10. lmmediately shut furnace down and call a service agencyif 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.
11. Never attempt to repair damaged parts. Always have them replaced by a
qualified service agency.
12. Never attempt to repair the furnace yourself. Seek the help of a qualified
service person.
13. Never restrict the ducting installed by your trailer manufacturer. To do so
could cause improper furnace operation.
14. 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.
15. Clothing or other flammable material should not be placed on or near the
appliance.
16. Alwaysfollowthe operatinginstructions. Do notdeviatefromthe step-by-step
procedures.
17. Do not use this appliance if any part has been submerged under water.
lmmediately 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 underwater.
18.Whenconsideringadd-onrooms, porchorpatio,attentionmustbegivento the
ventina ofvourfurnace. Forvour safetv. do notterminatefurnacevent insideadd-
on rooms: screen porch dr onto paii~~.Doing so will result in products of
combustion beingvented into the room or occupied areas.
19. Inany installation inwhich 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.

E OF INTAKE TO FLOOR
(2) 3.00- DIA. H
INSIDE WALL
OUTSIDE SKIN
OVER SUPPLY
UTE: 0- CLEARANCE PERMISSIBLE
AT REAR OF FURNACE FOR
A WIDTH OF
2.25' MAXIMUM.
GAS FITTING
Figure I
L3. DIA. (2) HOLES LCENTERLINE OF FURNACE
(OUTER SKIN) INSTALLATION
Figure2
SUBURBAN RECOHHENDS A RETURN AIR OPENING 0
49 SQ. IN. HINIHUH (7' X 7.) BE PROVIDED IN
COACH CABINETRY AND CENTERED BY RDOH dlR
BLOVER OPENING ON LEFT SIDE OF FURNdti VHE
USING ALL HINlHUH INSTALLATJON CLEARANCES.
2
AINTAIN A 1/4 INCH CLEARANCE WHERE
UCTS PASS THROUGH A CABlNET WALL
LISTED OUCT HATERIALS CAN BE 0'
CLEARANCE.
SUBURBAN RECOWENDS THAT A
6C SO. IN. HlNlHW
1 OPENING FOR RETURN AI* IN FRONT C THE FURNACE
(R' X 8' OPENING) BE PROVIDED.
Figure 3

COMBUSTION CHAMBER
/ ,-CABINET
Figure 7
5
'---A
Figure 6
TO CLEAN THE CHAMBER, THE FURNACE MUST BE REMOVED
FROM THE CABINET AND THE MANIFOLD BLOWER ASSEMBLY
AND CONTROLS REMOVED LEAVING THE CHAMBER ONLY, AS
SHOWN. USING COMPRESSED AIR BLOW THROUGH
THE
CHAMBER AS SHOWN BY ARROWS. TO REMOVE SOOT OR
LOOSE DEBRIS.
Figure 5
Figure 8

I I
Figure 9
Figure 10

Figure 11
REPLACEMENT PARTS LIST
ltem
NO .
1
2
3
4
Only factory
authorized parts arc to bc usod . Do not attcmptto repair
defoctivc parts
.
When order~ngrepair parts from your dealer. a Suburban Service Center. or
distributor. always give the following information:
1
. Part Number (Not Item No.)
2 . Part Description
3 . Model Number, Serial Number. and Date Code of Furnace
4
. Numberof Parts Required
Part
Description Nurnbor
Cabinet Assembly
.......................................... 101880
Fastener
. linnerman (2 Required) ....................... 121662
Suew (2 Required)
...................................... 121227
Cabinet Fronl
........................................ 101879
Suew (2 Required)
......................................... 121224
Duct Collar (4 Required)
................................. 050715
Thermoslat .............................................. 161154
Combustion Chamber Assemblv
............................ 021166BK
Saew(4 Required) ......................................... 121388
Gasket. Electrode
......................................... 070163
Electrode
................................................. 231933
Saew(2 Required)
......................................... 121407
Nut (2 Required)
....................................... 120717
BurnerAccess Door ........................................ 030764
Gaskel. BurnerAccess Door
............................... 070398
Screw(2 Required) ........................................ 121252
Limit Switch
............................................. 231607
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48
49
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51
52
53
61
62
63
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66
68
Part
Doscription Nurnbcr
BurnerAssernbly ....................................... 010702
Orifice
................................................. 180216
Gasket Manifold
......................................... 070408
Screw (6 Required)
...................................... 121388
Man~foldPipe .............................................. 171472
Bracket.Valve Mounling
...................................... 063265
Elbov/.Slreet .............................................. 171427
GasFilling ............................................ 170374
Screw (2 Required)
......................................... 121252
Valve
.................................................... 161123
Wheel. RoomAir
.......................................... 350098
Screw #I0x 318 (4 Required)
.................................. 121252
Blower HousingAssembly
................................. 390384BK
Screw~lO . 24 x 112 (3 Required) ........................... 121227
Miuoswitch Assembly ...................................... 232279
Screwr2 . 56 x 518 (2 Required) ............................... 121247
Nut #2-56
(2 Required) ....................................... 121951
23 Screw
.................
24 Bushing. Universal .....
25 Screw .................
................ 26 Splicer
27 Suew(2 Required)
......
28 Bracket. Power Supply ...
29 Screw (2 Required) ...
................ ................................... 120158 69 Screwt10'x 114 [3 ~equired)
..........
070362 ................................... 70 Bracket. motor Mount (3 Required)
. . .......... ................................. 121252 71 Nut #I0 24 Hex Keps (3 Required)
.........
230714 ................................... 72 Gasket. CrossoverTube (2 Required)
121244
.................................. 73 CrossoverTube ..........................
063248 ................
.................................. 74 Screw #I0 x 112 (2 Required)
.......................... ................................... 121252 75 MolorAssemblv
32 ~oduleBoard ....................
33 Screw (2 Required) .............
........... 34 Insulator. Module Board
35 Bushing. Snap
.................
36 Panel . Module Board ...........
39 Intake Tube Assembly ............
40 Vent Cap and Exhaust Tube Assembly
41 Suew(6 Required)
...............
42 Switch. ONIOFF ................
. ........................................ Gasket Motor Mount 070384
Housing
. Combustion Air Assembly .......................... 390179BK
. ..............................
Screw. #I0 16x 112 (2 Required) 121436
.....................................
Wheel. combustion Air 350110
Screw. #I0
- 16 x 112 (3 Required) .............................. 121436
...............................
Gasket. combustion Air Housing 070386
. ............................. Housing Combustion Air (Outside) 390424
................................. Suev~.#I0x 112 (9 Required) 121388
.......................................
linnerrnan . Fastener 121712