Suburban SF-42 User manual

SUBURBAN MANUFACTURING COMPANY
PostOfficeBox399
Dayton, Tennessee 37321
a substdlary 01 AIRXCEL, InC
CERTIFIED
SUBURBAN GAS FURNACES
INSTALLATION INSTRUCTIONS
FOR MODEL SF-42
The designofthe furnace has been listedfor installation inrecreational vehicles only. Inorder for the furnace to operate inconformity with generally accepted
safety regulations,the installation instructions mustbefollowed. Failure to complywiththe installation instructions will void the warranty onthe furnace and
any responsibility onthe part of Suburban Manufacturing Company.
The furnace was inspected beforeitleft the factory. If any parts are found to be damaged, do not install the furnace. Immediately contact the transportation
company and file a claim.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS:
Extinguish any open flame.
Evacuate all persons from the vehicle.
Shut off the gas supply at the gas
container or source.
Do not touch any electrical switch, or
use any phone or radio in the vehicle.
Do not start the vehicle's engine or
electric generator.
Contact the nearest gas supplier or
qualified service technician for repairs.
If you cannot reach a gas supplier 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 of
your furnace. Keep with unitat alltimes.
Should you require further information, contact your dealer or nearest
Suburban Service Center.
I
FOR YOUR SAFETY 1
DO NOT STORE OR USE GASOLINE OK
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 injury or loss of life. Refer to the
installation instructions and/or owners
manual provided with this appliance.
Installation and service must be
performed by a qualified installer, service
agency or the gas supplier.
WARNING! Be sure the furnace and all
ignition systems are "OFF" during any
type of refueling and while vehicle is in
motion or being towed.
INSTALLATION INSTRUCTIONS
WARNING!Installationofthisappliance mustbemadeinaccordance with
the written instructionsprovided inthis manual. 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.
These furnacesare designedand installed in such a manner as to be removable
only from the exterior of the recreationalvehicle.
CAUTION: If possible, do not install the furnace to where the vent can be
covered orobstructed when any door on the trailer isopened. If this is not
possible,then the travel of the door must be restricted inorder to provide
a
6" minimumclearance behveen the furnace vent and any door whenever
the door isopened.
NOTE' The exhaust temperature of this furnace could discolor or warp some
materials You should verify that the materlal used on the coach door, panel, or
cover will not discolor or warp from the exhaust temperaturewhenever any door,
panel, or cover is in the open posit~on.
CAUTION: Dueto the differences invinyl siding, this applianceshould not
beinstalledonvinylsiding withoutfirst consultingwiththe manufacturerof
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
coveredduetothe construction ofthe RVor somespecialfeature ofthe
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.
CAUTION: This furnace was shipped from the factory set up for the gas
connection to be madeat the right rear ofthe unitas illustrated inFigure
1.
If you wish to make gas connection through the top of cabinet, yo; must
removefurnace from cabinetand turn gas inletfitting
90" CLOCKWISE. DO
NOT TURN FITTING COUNTER-CLOCKWISE, this will loosen fitting and
result ina gas leak
from being inserted on the valve and to prevent any leaks from
developing. Be sure to check all fittings for leaks including the inletand
outlet on the valve before reinstalling furnace into cabinet. Correct all
leaks immediately. NOTE: The furnace mustbe in operation to properly
NOTE.These furnaces must be
installed andvented as descr~bedInth~smanual
so that the negat~vepressurecreated by the air circulating (return air) fan cannot
affect the combustion air intakeor venting of any other appliance. Itis lmperat~ve
thatthe productsofcombustionbe properlyventedto the atmosphereandthat all
combustion air suppltedto burner be drawn from the outstde atmosphere (See
lnstalllng Vent Assembly.)
NOTE: Do not installthe furnacewith the vent facing toward the forward elid of
the coach.
Form No.
2551 -C

IMPORTANT: If this furnace is to be connected to a common duct system also
sewing a cooling unit, a manual or automatic damper is required to prevent any
cold conditioned air from circulating back into the furnace. Cold air passing over
thefurnacecombustionchamber during theoperationofthe cooling unitcan result
in the formation of
condensation inside the furnace combustion chamber. This
condensation may promote corrosion and premature fallure of the combustion
chamber.
NOTE. These furnaces shall be installed so the electrical components are
protected from water.
These furnaces are design certlfled for propane1LP gas only Do not attempt to
convert to natural gas
Gas supply pressure for purposes of input adjustment.
Minlmum - 11"W.C '
Maximum -
(W.C.' - Water Column)
In the U.SA,the installation of the furnace must be in accordance with local
codesand regulations Inthe absence of local codes and regulatlons, referto the
latest editlon of:
I. Standardfor Recreational Vehicles ANSI A-119 21NFPA 501C
2. National FuelGas Code ANSI 2223.1
3. Furnace must be electr~callygrounded inaccordance with the latest ed~tionof
the National Electrical Code ANSIINFPA No 70.
In Canada, the furnace must be installed in accordance with.
I. Standard CANICSA-2240 Recreational Vehicles
2. CSA Standard CANICSA-Z240.6 2-ME6 Electrical Requirements for
Recreational Vehicles.
3. Standard CANICSA-Z240.4.2-ME6 lnstallatlon 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 electric ignlter device that has an energy
consumption of
.l amp @ 12 volts D C.
WARNING! Extensiontubes cannot be used. If youtrytoextendthe vent,
it will result in improper installation which could cause unsafe furnace
operation.
Therearethree(3)methodsdescribed belowforinstalling thefurnace. Regardless
of the method you choose. we require an opening be prov~ded~nthe exterior 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
minimum of 17-314x 8.
Itis important that adequate return air be provided to assure normal heating and
operation of the furnace. Failure to provide the minimum return air will cause
erratic furnace cycling. Refer to the chart shown below for minimum return air
requirements.
I I
TABLE I
Note: Return air must be from within the living area of the coach.
A. INSTALLATION DIRECTLY AGAINST OUTER PANEL OF COACH
(See Figure
I) (Panel supplied by installer)
Maximum wall thickness for this type installation is2".
I. Locatethe furnace near lengthwise center of the coach.
2. Choose a location for installation out of the way of wires, pipes, etc.. which
might interfere with the installation. Adhere to the minimum clearances from the
cabinet to combustible
construction as listed in Table 2. Refer to Figure 3 for
illustration of furnace clearances.
3. When an appliance is installed directly on carpet~ng.tlle or other combustible
material, other than wood flooring, the appliance shall be Installedon 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 awaythe full
length and depth of the appliance plus the appliance minimum clearances to
combustibles. (See Table 2.)
4. Cutanopening throughthe innerwall. This will allow the rearof thefurnace to
be installed against the outer panel of the coach.
5. Locate center lines for exhaust and intake, as shown in Figure 1
6. Cut two 2-114" diameter holes through the outer panel of the coach. (See
Figure 1
.)
7. Put furnace in place, making sure that rearof the furnace cabinet is as close
to outer panel of the coach as possible and still assure proper vent tube overlap
(See Installing Vent Assembly.)
ReturnAir Requirements
Model Minimum Free(unobstructed) Area
8. 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.)
9. Be sure furnace is securedwithin furnace cabinet. (See Figure 4.)
10. Install vent assembly. (See instructions for installing vent)
SF-42
B. INSTALLATION FLUSH WITH INNER WALL OF COACH
(See Figure 2) (Exterior panelsupplied by installer)
142 Sq. In.'
'may be reduced to 88 sq. in. min. 11 5 ducts are used
I Maximum wall thickness for this type installation is 2".
I. 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 w~ththe ~nstallation.Adhere to the minimum clearances from
cabinet to combust~bleconstruclion as listed in Table 2 Refer to Figure 3 for
illustration of furnace clearances.
3.' When an appliance is installed d~rectlyon 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 materlals.other than wood may be cut away the full
length and depth of the appliance plus the appliance minimum clearances to
combust~ble.(SeeTable 2.)
4. Locate center l~nesfor exhaust and intaketubes as shown in Figure 1
5. Cut Lo2-314''diameter holes through the removablewallsection (See Figure
2.)
6. Put furnace in place, making sure that rear of furnace cabinet is as close to
inner wall section of the coach as possible and still assure proper vent tube
overlap (See Installing Vent Assembly.)
7. Using the two #10 x 314 stainless screws provided, fasten furnace cabinet to
floor of coach through the holes provided ~nthe furnace cabinet. (See Figure 4.)
8. Be sure furnace is secured within furnace cabinet (See Figure4.)
9. lnstall vent assembly. (See instructions for installing vent.)
C. INSTALLATION USING THE FURNACE ACCESS DOOR SUPPLIED BY
SUBURBAN (See Figure4)
Maximum wall thickness for this type installationis2".
I. Locate the furnace near lengthwise center of coach.
2. Choose a location for installation out of the way of wires, pipes, etc., which
might interfere with the installation. Adhere to the minimum clearances from the
cabinet to combustible construction as listed in Table 2. Refer to Figure 3 for
illustration of furnace clearances.
3. When an appliance is installed directly on carpeting, tile or other combustible
material, other than wood flooring, the appliance shall be installed on a metal or
wood panel extending the full wldth and depth of the appliance. If preferred, the
carpeting, tile or combustible maters, other than wood may be cut away the full
length and depth of the appliance plus the appliance minimum clearances to
combustibles. (See Table 2.)
4. After furnace location has beendetermined, cut an opening 18-7/32 x 8-9/32'
through the inner coach wall and the outer wall (skin) of the coach.
5. Caulk around opening as illustrated. Apply generously. The purpose of the
caulking isto sealthe back side of the door frame and the coachskinwater tight.
6. Secure frame toouterwall (skin)throughthe holesintheframe. Screwsshould
be used. (See Figure 4.) NOTE: Do not place screws into the holes required for
mountlng the door.
7. Slide furnace in place. The back of the 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 #lox 314 stainless screws provided, fasten furnace cabinet to
floor of coach through the holes provided in the furnace cabinet. (See Figure 4.)
9. Besure 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 strength to keepfurnace access door
in place and insure a tight seal. It may be necessary to build a wood or metal
frame around theopening inorder to provideadequatestrength for securing door.
CAUTION: The screws provided with the door may not be of sufficient
lengthand size for all applications and itmay be necessary for the installer
tosubstitute screws inorder to adequately securethe furnace access door.
11. Install vent assembly. (See instructions for installing veni.)
Left Right Exhaustand
Model Front Side Side Top Bonom Back Intake Tube
SF-42 1" 2"
2 1" 0 0" 318"
-NOTE-
0" MEANS TO SPACER BUMPS
CLEARANCE FROM DUCTS TO
COMBUSTIBLE MATERIAL
- 114" (See Figure 3)
TABLE 2
INSTALLING VENT ASSEMBLY
The vent outlet must be installed so it is in the same atmospheric pressure zone
as thecombustion air intake. The exhaustand Intaketubes mustbeinstalled from
the outside, pass through the RV skin and slide onto the furnace exhaust and
intake.
WARNING! Donotalter the ventassemblysuppliedwiththisfurnace. Any
modificationswillresultinimproperinstallation whichcouldcauseunsafe
furnace operation.

SUBURBAN MANUFACTURINGCOMPANY
PostOffice Box
399
Dayton, Tennessee 37321
a SuDsldlary 01 AIRXCEL, Inc.
SUBURBAN GAS FURNACES
CERTIFIED INSTALLATION INSTRUCTIONS
FOR MODELSF-42
The designofthe furnace has been listedfor installation inrecreationalvehicles only. Inorder for the furnace to operate inconformity with generally accepted
safety regulations, the installation instructionsmustbefollowed. Failure to comply withthe installation instructionswillvoid thewarranty on the furnace and
any responsibility onthe part of Suburban Manufacturing Company.
The furnace was inspected before itleft the factory. If any parts are found to be damaged, do not install the furnace. Immediately contact the transportation
company and file a claim.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS:
Extinguish any open flame.
Evacuate all persons from the vehicle.
Shut off the gas supply at the gas
container or source.
Do not touch any electrical switch, or
use any phone or radio in the vehicle.
Do not start the vehicle's engine or
electric generator.
Contact the nearest gas supplier or
qualified service technician for repairs.
If you cannot reach a gas supplier or
qualified service technician, contact the
nearest fire department.
Do not turn on the gas supply until the
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 propertydamage,
personal injury or loss of life. Refer to the
installation instructions andlor owners
manual provided with this appliance.
Installation and service must be
performed by a qualified installer,service
agency or the gas supplier.
lmotion or being towed.
This book contains instructionscovering the operationand maintenance of
your furnace. Keep with unitatalltimes.
S~OUI~ YOU require further information, 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! Installationofthisappliancemustbemadeinaccordancewith
thewritten instructionsprovidedinthis manual. Noagent, representative
or employee of.Suburbanor other person has the authority to change,
modify or waive any provision of the instructions contained in this
manual.
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.
CAUTION: This furnace was shipped from the factory set up for the gas
connection to be madeatthe right rear of the unitas illustrated in Figure
1.
If you wish to make gas connection through the top of cabinet, you must
Thesefurnaces are designed and installed in such a manneras to be removable
remove furnace from cabinet and turn gas inlet fitting
CLOCKWISE. DO
only from the exterior of the recreational vehicle. NOT TURN FITTING COUNTER-CLOCKWISE, this will loosen fitting and
CAUTION: If possible, do not install the furnace to where the vent can be result ina gas leak
covered or obstructed when any door on the trailer isopened. Ifthis is not
possible, then the travel of the door must be restricted inorder to provide
a
6" minimum clearance between the furnace vent and any door whenever
the door isopened.
NOTE The exhaust temperature of th~sfurnace could dlscolor or warp some
materials You should ver~fythat the matercal used on the coach door panel,or
coverw~llnotd~scoloror warp from the exhausttemperaturewhenever any door.
panel,or cover
IS ln the open posltlon NOTE Thesefurnaces must be ~nstalledand vented as descr~bed~nth~smanual
from being inserted on the valve and to prevent any leaks from
developing. Besureto check all fittings for leaks includingthe inlet and
outlet on the valve before reinstalling furnace into cabinet. Correct all
leaks immediately. NOTE: The furnace must be inoperation to properly
CAUTION: Due to the differences in vinyl siding, this appliance should not
SO that the negative pressurecreated by the air circulating (returnalr)fan cannot
beinstalled on vinyl
without first consulting with the manufacturer of
affect the combustion air ~ntakeor ventingofany other appl~ance.Itis imperative
the siding or cutting the siding away from the area around the appliance that the productsof combust~onbeproperlyventedto the atmosphereandthat all
vent. combust~onair supplied to burner be drawn from the outs~deatmosphere (See
lnstalllng Vent Assembly.)
CAUTION: In any installation in which the vent of this appliance can be
due tothe construction ofthe RV or some s~ecial feature ofthe RV
NOTE: Do not install the furnace with the vent facing toward the forward end of
such as slide out, pop-up etc. always insure that the appliance cannot be
the
FormNo. 2551 -C

IMPORTANT: If this furnace is to be connected to a common duct system also
serving a cooling unit, a manual or automatic damper is required to prevent any
cold conditioned air from circulating back into the furnace. Cold alr passing over
thefurnacecombustionchamberduringthe
operation ofthe coollngunitcanresult
in the formation of condensation inside the furnace combustion chamber. This
condensation may promote corrosion and premature failure of the combustion
chamber.
NOTE. These furnaces shall be installed so the electr~calcomponents are
protected from water.
These furnaces are design certif~edfor propane1LP gas only. Do not attempt to
convert to natural gas.
Gas supply pressure for purposesofinput adlustment:
Minimum - 11"W C '
Maximum - 13"WC
(W C.' -WaterColumn).
In the USA
. the installation of the furnace must be in accordance with local
codes and regulations Inthe absence oflocal codes and regulations, refer to the
latest edition of:
1. Standard for Recreational Vehicles ANSl A-119 2iNFPA 501C
2. National Fuel Gas Code ANSl 2223.1
3. Furnace must be electrically grounded in accordance with the latest edition of
the Nat~onalElectrical Code ANSliNFPA No 70
In Canada, the furnace must be installed In accordance wlth'
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 Requ~rementsfor Propane
Appliances and Equipment in Recreational Vehicles.
4. CANICGA-6149 lnstallation Codes
5. Any applicable local codes and regulations
Th~sunit is equipped with an electric igniter device that has an energy
consumption of 1amp
@ 12 volts D.C.
WARNING! Extensiontubes cannot be used. Ifyou try toextendthe vent,
itwill result inimproper installation which could cause unsafe furnace
operation.
Therearethree(3)methodsdescribedbelowfor installing the furnace. Regardless
of the method you choose, we require an opening be prov~dedin the exterior of
the trailer or motor home for free, unobstructed removal of the furnace. Th~s
exterior, removable panel or wall section of the trailer or motor home must be a
mlnimum of 17-314 x 8.
It is important that adequate return air be provided to assure normal heating and
operation of the furnace. Fa~lureto provide the minimum return air will cause
erratic furnace cycling. Refer to the chart shown below for minimum return air
requirements.
ReturnAir Requirements
Model Minimum Free(unobstructed)Area
SF-42
I 142 Sq In.'
'may be reduced to 88 sq In rnin, if 5 ducls are used.
TABLE 1
Note: Return air must be from within the living area of the coach
A. INSTALLATION DIRECTLY AGAINST OUTER PANELOF COACH
(See Figure I)(Panel supplied by installer)
Maximumwallthickness for this type installation is
2".
1. Locatethe furnace near lengthwise center of the coach.
2. Choose a location for installation out of the way of wires, plpes, etc., which
might interfere with the installation. Adhere to the minimum clearances from the
cabinet to combustible construction as listed ~nTable 2. Refer to Figure 3 for
~llustrationof furnace clearances.
3. When an appliance is installed directly on carpeting, tile or other combust~ble
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 maybe cut away the full
length and depth of the appliance plus the appliance minimum clearances to
combustibles. (See Table 2.)
4. Cutan openingthrough the innerwall. This will allow the rear of the furnace to
be installed against the outer panel of the coach.
5. Locate center lines for exhaust and Intake, as shown in Ftgure 1
6. Cut two 2-114'' d~ameterholes through the outer panel of the coach. (See
Figure 1.)
7. Put furnace in place, making sure that rear of the furnace cabinet is as close
to outer panel of the coachas possible and still assure propervent tube overlap.
(See Installing Vent Assembly.)
8. 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.)
9. Be sure furnace IS secured within furnace cabinet. (See Figure 4.)
10. Installvent assembly. (See instructions for installing vent.)
B. INSTALLATION FLUSH WITH INNER WALL OF COACH
(See Figure
2) (Exteriorpanelsupplied by installer)
Maximumwall thickness for this type installationis
2".
1. Locate the furnace near lengthwise center of the coach
2. Choose a location for lnstallation out of the way of wires, plpes. etc, which
might Interfere with the lnstallation. Adhere to the minimum clearances from
cabinet to combustible constructton as listed in Table 2. Refer to Figure 3 for
illustration of furnace clearances.
3.' When an
appliance is installed dlrectly 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 materlals, other than wood may be cut awaythe full
length and depth of the appliance plus the appliance minimum clearances to
combustible (See Table 2.)
4. Locate center llnes for exhaust and intake tubes as shown ~nFigure 1
5. CutGo2-314"diameter holes through the removable wall seclion. (SeeF~gure
2.)
6. Put furnace in place, making sure that rear of furnace cabinet is as close to
Inner wall sectlon of the coach as possible and still assure proper vent tube
overlap. (SeeInstalling Vent Assembly.)
7. Using the two #lox 314 stainless screws provided, fasten furnace cabinet to
floor of coach through the holes provided in the furnace cabinet. (See Figure 4.)
8. Besure furnace is secured within furnace cabinet (SeeFigure 4.)
9. Installvent assembly. (See instructions for install~ngvent.)
C. INSTALLATION USING THE FURNACE ACCESS DOOR SUPPLIED BY
SUBURBAN(See Figure4)
Maximum wall thickness for this type installationis
2".
1. Locate the furnace near lengthwise center of coach.
2. Choose a location for installation out of the way of wires, plpes, etc.. which
might interfere with the installation. Adhere to the minimum clearances from the
cabinet to combustible construction as listed in Table 2. Refer to Figure 3 for
illustration of furnace clearances.
3. When an appliance is installed directly on carpeting, tile or other 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 maters, other than wood may be cut away the full
length and depth of the appliance plus the appliance minimum clearances to
combustibles. (See Table 2.)
4. After furnace location has been determined, cut an opening 18-7/32x 8-9/32"
through the inner coachwall and the outer wall (skin) of the coach.
5. Caulk around opening as illustrated. Apply generously. The purpose of the
caulking is to seal the back side of the door frame and the coachskin water tight.
6. Secureframeto outerwall (skin)throughthe holesinthe frame. Screws should
be used. (See Figure 4.) NOTE: Do not place screws into the holes required for
mounting the door.
7. Slide furnace in place.The back of the furnace should be installed against or
as close as possible to the flange on the door frame. (See illustration.) The
furnace must maintain 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. Posit~onfurnace access door over the frame. Secure the door to the coach
skin. Besure the coach skln is of sufficient strengthto keepfurnace access door
in place and insure a tight seal. It may be necessary to build a wood or metal
frame around theopening inorder to provideadequate strength for securing door.
CAUTION: The screws provided with the door may not be of sufficient
lengthand sizefor all applications and itmay be necessary for the installer
tosubstitutescrewsinorder toadequately securethefurnace access door.
11. Installvent assembly. (See instructions for installing vent.)
Left Right Exhaust and
Model Front Side Side Top Bottom Back Intake Tube
SF-42 1"
2" 2 1" 0 0 318"
0" MEANS TO SPACER BUMPS
CLEARANCE FROM DUCTS TO
TABLE
2
INSTALLING VENT ASSEMBLY
The vent outlet must be installed so it is in the sameatmospheric pressure zone
asthecombust~onair intake. Theexhaustand intake tubes mustbe installed from
the outside, pass through the RV skin and slide onto the furnace exhaust and
intake.
WARNING! Donotalter theventassembly suppliedwith this furnace. Any
modificationswillresultinimproperinstallationwhichcouldcause unsafe
furnace operation.