Suburban NT.12SE Guide

SUBURBAN MANUFACTURING COMPANY
Post Office Box 399
Dayton. Tennessee 37321
a subsidiary of A1RXCEL;lnc.
USER'S INFORMATION
MANUAL
For Models
NT-12SE NT-I6SE NT-20SE
This book contains instructions for operating and
maintaining the furnace. Keep with unit at all times.
Should you require further information, contact your
dealer or nearestSuburban Service Center.
WARNING! Installation of this appliance
must be made in accordance with the
written instructions provided in this
manual. No agent, representative or
employee of Suburban or other person
has the authority to change, modify or
waive any provision of the instructions
contained inthis manual.
WARNING! Be sure the furnace and all
ignition systems are "OFF" during any
type of refueling and while vehicle is in
motionor beingtowed.
WARNING! Improper installation,
adjustment, alteration, service or
maintenancecancausepropertydamage,
personal injury or loss of life. Refertothe
installation instructions andlor owners
manual providedwith this appliance.
- Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
-WHAT TO DO IFYOU SMELL GAS
Extinguish any open flame.
Evacuateallpersonsfromthevehicle.
Shut off the gas supply at the gas
container or source.
Do nottouch 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 service technicianfor repairs.
If you cannot reach a gas supplier or
qualified servicetechnician, contactthe
nearestfire department.
Do not turn on the gas supply until
the gas leak(s) has been repaired.
- Installation and service must be
performed by a qualified installer,
service agency orthe gas supplier.
Due to high temperatures, the unit should be located out of traffic and
away from furniture and draperies.
Children and adults should be alerted to the hazards of high surface
temperatures and shouldstay away to avoid burns or clothing ignition.
Youngchildrenshouldbecarefully supervised whentheyareinthesame
roomas the unit.
Clothing or other flammablematerialshouldnotbeplacedonornearthe
unit.
Any safety screen or guard removed for servicing the unit must be
replaced prior to operating the unit.
Theareaaroundthe unitmustbekeptclear fromcombustiblematerials,
gasoline and other flammable vapors and liquids.
lnstallation and repairs should be done bya qualified service person.
The unit should be inspected before use and at least annually by a
qualified service person. Morefrequent cleaning mayberequireddue to
excessivelintfrom carpeting, beddingmaterial, etc. Itisimperative that
control compartments, burners, and circulating air passagewaysof the
unit be kept clean.
FormNo. 2465-C

MAINTENANCE AND CLEANING
condition inwhich it was shipped from the factoryor if the appliance is
notusedsolelyfor itsintendedpurposeor ifappliance isnotmaintained
inaccordancewiththeinstructions inthis manual, then the risk of a fire
andlor the production of carbon monoxide exists which can cause
CAUTION: Label all wires before disconnecting for servicing. Proper
polarity must be observed so the furnace motor will run with the proper
direction of rotation to insurecorrect air delivery. (See wiring diagram).
CAUTION: Labelallwires prior to disconnection when servicingcontrols.
Wiring error can cause improper and dangerousfurnace operation.
Always verify proper operationof furnace after servicing.
Your furnace should be inspected by a qualified service agency yearly
beforeturning thefurnace on. Particular attention should be given to the
following items.
1. lnspectfurnace installation andventterminationto besure furnaceisproperly
secured in place (See Installation Instructions), that vent terminates to the
atmosphere, and that vent tubes overlap properly (See Installing Vent
Assembly).
2. lnspect chamber andventingto assure that these components are physically
sound, without holes or excessive corrosion and that the installation andlor
reinstallation is in accordance with Suburban's Installation Instructions.
(Reference installation manual supplied with furnace.)
WARNING! It is imperativethat the products of combustion
be properly
vented toatmosphere and that all combustion air suppliedtoburnerbe
drawn from outside atmosphere.
3. Check the base onwhich furnace ismounted. Be sure it isphysicallysound.
void of any sagging, deterioration, etc
4. lnspect furnace, the venting and the 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
imperativethat 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.
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 presenceof soot on vent. Operating the furnace underthis
condition couldleadto serious property damage, personal injury or loss of life.
If soot IS observed on the vent, immediately shut the furnace dowrrand contact
a qualified service agency.
Listed below are several safety related items that you should follow during the
heating season to assure continued safe operation of the furnace.
1. Inspectl~rnacevent~ngVenl.ngmustbefreeof oastructlons,vo~dof sootand
properly termmated to tne atmosphere
WARNING! Donot installscreens over thevent for any reason. Screens
willbecomerestrictedandcauseunsafefurnaceoperation. Accessories
are being marketed for RV products which we do not recommend. For
yoursafety, onlyfactoryauthorizedpartsareto
be usedonyourfurnace.
2. Periodically observe the main burner flameto assgre it is burlingwith a hard
blueflame withwell definedburner ports (SeeFigure
2). If flame appears yellow
or burner has a lazy flame, shut furnace down. It is possible that burner needs
cleaning or replaced. To inspect the main burner, remove the four
(4) screws (A,
B. C and D) securing the burner access door to the combustion chamber (See
-
Figure 1). If excessive rust and corrosion are present on burner surface, the
burner must be thoroughly cleaned or replaced. The burner may be cleaned
usinga steel wire brush and blown clean using high compression air. Contact
a
qualified service person for assistance.
NOTE: To observe flame, cabinet front must be removed. Operation of burner
can then beabserved through the viewing window on front of chamber. (See
Figure
1 .)
3. Periodically inspect the vent for obstructions or presence of soot. Soot is
formed whenever combustion isincomplete. This isyour 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.
4. Keepfurnace clean. Morefrequentcleaning mayberequireddueto excessive
lint from carpeting, bedding material, etc. It is imperative that control
compartments,burnersandcirculating air passagewaysof theappliance bekept
clean.
5. The motor is permanently lubricated and requires no oiling.
6. Keep the furnace area clear of any combustible materials, gasoline or other
flammable vapor and liquids.
7. Before operating furnace, check the location of the furnace vent to make sure
it will not be blocked by the opening of any door on the trailer.
If it can be
blocked, do not operate the furnace with the door open.
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. Neveroperate the furnace if you smell gas. Do not assume that the smell of
gas in your RV is normal. Any time you detect the odor of gas, it is to be
considered life threatening and corrected immediately. Extinguish any open
flames including cigarettes and evacuate all persons from the vehicle. Shut off
gas supply at LP gas bottle. (See safety notice on front cover of this manual.)
10. Immediately shut furnace down and call a service agency if furnace cycles
erratically or delays on ignition.
WARNING! Shouldoverheating 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. Clothing or other flammable material should not be placed on or near the
appliance.
14. Always follow the Operating Instruct~ons.Do not deviate from the step-by-
step procedures.
15. Inany installation inwhich the vent of this appliance can be covered due to
the construction of the R'J or some special feature of the RV such as slide out,
pop-up etc. always insu-e that the appliance cannot be operated by setting the
thermostat to the positi~e'OFF" position and shutting off all electrical and gas
supply to the appliance. Never operate furnace with vent covered.
BURNER OBSERVATION
GAS FITTING
16. When considering add-on rooms, porch or patio, attention must begiven to
the ventingof yourfurnace. Foryoursafety, do not terminate 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.
I
HIGH YELLOW FLAME1 1
SHARP BLUE FLAME
8
CORRECT
1 FLAME FLAME
INCORRECT I
Figure 2
Figure 1

OPERATING INSTRUCTIONS
WARNING: Donotoperatefurnacewhilevehicleisinmotion
orbeingtowed.
NOTE: During initialfiring of this furnace a burn-off of excess paint
and oils remaining from manufacturing process may cause
'smoking" for
5 - 10 minutes.
- FOR YOUR SAFETY READ BEFORE OPERATING -
WARNING: If you do not follow these instr~~ctionsexactly, a fire
orexplosion mayresultcausing propertydamage, personal injury
or loss of life.
k This appliance does not have a pilot. It is equipped with an igniriondevice
which automatically lights the burner. Donot light the burner by hand.
B. BEFOREOPERATING smell all around the appliance area for gas. Be sure
to smell next to the floor becausesome gas isheavier than air and will settle
on the floor.
WHAT TO DO IFYOU SMELLGAS
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 electric switch or use any phone or radio in the vehicle.
Contact the nearest gas supplier orqualified service technician for repairs.
- If you cannot reach a gas supplier or qualified service technician, contact
the nearestfire department.
Do notturn on the gas supply until the gas leak(s) has been repaired.
C. Useonly your handto turn the handle onthe manual shutoffvalve. Neveruse
tools. If the handle will notturn by hand, don't try to repair it, call a qualified
servicetechnician. Forceor attempted repairmay result in afire or explosion.
D. Do not use this appliance if any part has been under water. Immediatelycall
aqualified service technician to inspect the appliance and to replace anypart
of the control system and any gas control which has been underwater.
- Do not start the vehicle's engine or electric generator.
OPERATING INSTRUCTIONS
I. STOP! Read the safety information above on this label
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance.
7.
Turn on all electric powerto the appliance. These units are for usewith LP
gas only. LP gas is heavier then air. Therefore. to better clear out any gas,
the heatershould be operated forfive(5) minuteswith the bloweron andthe
gas off.
4. The appliance is equippedwith an ignition device which automatically lights
8. Tum shut-off valve to'ON".
the burner. Donottry to lightthe burner by hand.
9. Set thermostat to desired setting.
5. Turn shut-off valve to 'OFF". This furnace is equippedwith a valve shut-off
If the appliance will not operate, follow the instructions
Off Gas to
switch. With switch in 'OFF position, gas will not flow to burner nor will the
furnace operate. Appliance" and call your service technician or gas supplier. NOTE: If the
furnace should lock-out, the blowerwill go off in
5 minutes and remain off
6. Wait five (5) minutes to clear out any gas. Then smell for gas including near until unit is reset by reactivating thermostat.
the floor. If you then smell gas, STOP! Follow
'B" in the safety information
above on this label. If you don't smell gas, go to next step.
TO TURN OFF GAS TO APPLIANCE
I.
Set the thermostat to lowest setting, then move lever to "OFF" position. 3. Turn shut-off valve to 'OFF". Donot force.
2. Turn off all electric power to the appliance if service is to be performed.

Figure 3
Figure 4

4?
Figure 5

REPLACEMENTPARTS LIST
Models
NT-IZSE NT-16SE NT-ZOSE
I Only factory authorized parts are to be used. Do not attempt to repair defective parts. 1
When ordering repair parts from your dealer.
always give the following information.
I. Part Number (Not ltem No.)
2. Part Description
3. Model No., Serial No. and Date Code
4. Numberof Parts Required
Item Par( Number
No. NT-1ZSE NT-16% NT-ZOSE
1 161154 161154 161154
a Suburban Service Center, or distributor.
of Furnace
Description
Thermostat (Suburban supplied thermostat not
applicableto some models)
Screw. #I0x 314 (2 Required)
Screw.
#a x 318 (2Required)
Cabinet Front (Brown)
Cabinet Front (Gray)
Cabinet Front (Light Gray)
Cabinet
Bushing
Tube. Intake (Standard)
(5' Long)
Tube, lntake (Special) (2 314'Long)
Tube, Intake (Special) (7 314' Long)
Vent Cap and Exhaust Tube Assembly
Screw. #I0 x 314 (6 Required)
Bracket. Microswitch Mounting
Screw. #2
- 56 x 518 (2Required)
Microswitch Assembly
Washer Lock #2 (2 Required)
Nut. Hex#2-56 (2 Required)
Comb~ston ~hamoeri~hleldAssembly
Scre~.u10x 112 W~tnSenate0 Head 12 Renulredl
. .
Screw. #8 x 318 (2 Required)
Grommet
Limit Switch
Screw. #8 x 318 (2 Required)
Screw.
#6 x 114 (2 Required)
Splicer
Screw. #8 x 318 (2 Required)
Screw. #8 x 318 (2Required)
Bushing
Screw. #6 x 518 (2 Required)
Module Board
Stiffener Bracket. Combustion Air Housing
Screw.
!# x 318 (2 Required)
Gasket. Burner Tunnel
Nut 10-24 HexLock (2 Required)
Screw. #8 x 318 (2 Required',
Wheel. Combustion Air
Screw.
!# x 318 (9 Required)
Box. CombustionAir (Outside) Assembly
Nut 10-32Hex Lock (2 Required)
Gasket. Combustion Air Box
Washer. Flat (2Required)
Box. Combustion Air (Inside)Assembly
Grommet(2 Required)
Gasket. Motor
Motor
Impeller. Room Air
Bracket. Combustion AI~Housing Mounting
Screw. #8
- 32 Self Tapping (2 Required)
Electrode
Gasket. Electrode
Screw. #I0 x 112 Serrated Head (4 Required)
Nut 10-24Hex Lock (2 Required)
Door, Bumer Access
Gasket. Burner Access Door
Gas Fining
Valve
Bracket. ManifoldMounting
Screw. #8 x 318 (2 Required)
Manifold Assembly
Screw. #8 x 112 (4 Required)
Orifice. MainBurner
Gasket. Manifold
Burner Assembly
Bracket. Switch. Mounting
Switch. ONIOFF
Screw. #8 x 318

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TWO YEAR LIMITED WARRANTY
TWO YEAR LIMITEDWARRANTY
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
consumerlowner to establish the warranty period. Suburban does not use warranty registration cards for its standard warranty. You are required
to furnish proof of purchase date through a Bill of Sale or other payment record.
Suburban will replace any parts that are found defective within the first two years and will pay a warranty service allowance directly to the
authorized Suburban Service Center at rates mutually agreed upon between Suburban and its authorized service centers. Replacement parts
will be shipped FOB the shipping point within the Continental United States. Alaska and Canada to authorized service centers performing such
repairs. Before havinq warranty repairs made,confirmthat the service aqency is an authorized service center for Suburban. DO NOT PAYTHE
SERVICE AGENCY FOR WARRANTY REPAIRS; SUCH PAYMENTS WlLL NOT BEREIMBURSED.
For warranty service, the ownerluser should contact the nearest authorized Suburban Service Center, advising them of the model and serial
numbers (located on the furnace) and the natureof the defect. Transportation ofthe unit to andfrom the ServiceCenter andlor travel expenses
of the Service Center to your location is the responsibility of the ownerluser. A listing of authorized Service Centers is included in the owner's
packet supplied with the furnace and a current listing maybe obtained from Suburban. Ifyou cannot locate an authorized service center locally,
the service agency chosen to perform warranty repairs must contact our Service Department at 423-775-2131 for authorization. Unauthorized
repairs made will not be paid by Suburban.
THREE YEAR LIMITEDWARRANTY ON HEAT EXCHANGER
The furnace heat exchanger is further warranted to befree from defects in material and workmanship during the third through fifth year after the
date of original purchase. A replacementheat exchangerwill be provided underthe same conditions as statedinthetwo yearwarranty EXCEPT
no labor reimbursement will be provided.
LIMITATION OFWARRANTIES
ALL IMPLIEDWARRANTIES (INCLUDINGIMPLIEDWARRANTIES OF MERCHANTABILITY) ARE HEREBYLIMITED INDURATIONTOTHE
PERIOD FORWHICH EACH ILIMITEDWARRANTY ISGIVEN. SOME STATES DONOTALLOW LIMITATIONSONHOWLONGAN IMPLIED
WARRANTYLASTSSOTHEABOVELIMITATIONSMAYNOTAPPLYTOYOU.THE EXPRESSEDWARRANTIES MADEINTHlSWARRANTY
ARE EXCLUSIVE AND MAY NOT BE ALTERED. ENLARGED. OR CHANGED BY ANY DISTRIBUTOR, DEALER OR OTHER PERSON
WHOMSOEVER.
SUBURBAN WlLL NOT BERESPONSIBLEFOR:
1. Normalmaintenance asoutlined in the installation, operating andservice instructions owner's manualincluding cleaning of component parts;
such as, orifices and burners.
2. Initial checkouts and subsequent checkouts which indicate the furnace is operating properly,or diagnosis without repair.
3. Damageor repairs requiredas a consequence of faulty or incorrect installation or application not in conformancewith Suburban instructions.
4. Failure to start andlor operate due to loose or disconnected wires; water or dirt in controls, fuel lines and gas tanks; restriction or alteration
of return air circulation; low voltage.
5. Routine adjustments that may be required to the thermostat, electrode and burner.
6. Costs incurred in gaining access to the furnace.
7. Parts or accessories not supplied by Suburban.
8. Freight charges incurredfrom parts replacements
9. Damage or repairs needed as a consequence oPany misapplication, abuse, unreasonable use, unauthorized alteration, improper service,
improperoperation or 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. Hawaii and Canada.
12. Damage as a result of floods, winds, lightning, accidents, corrosive atmosphere or other conditions beyond the control of Suburban.
13. ANY SPECIAL, INDIRECT OR CONSEQUENTIAL PROPERTY, ECONOMIC OR COMMERCIAL DAMAGE OF ANY NATURE
WHATSOEVER. Some states do not allow the exclusion of incidental or consequential damages, so the above limitation may not apply to you.
NOREPRESENTATIVE.DEALEROROTHERPERSONISAUTHORIZEDTOASSUME FORSUBURBAN MANUFACTURING COMPANYANY
ADDITIONAL, DIFFERENT OR OTHER LIABILITY IN CONNECTION WITH THE SALE OF THlS SUBURBAN PRODUCT.
This warranty gives you specific legal rights, and you mayalso have other rights which vary from state to state
IF YOU HAVE A PRODUCT PROBLEM
FIRST:
If your RV has its original furnace and is still under the RV manufacturer's warranty, follow the steps described in your RV owner's manual.
SECOND:
Contact a conveniently located recommended Suburban Service Center. Describe to them the nature of your problem, make an appointment, if
necessary,and provide for delivery of the furnace to the selected service center.
THIRD:
For the location of the nearest service center, refer to the listing provided or contact:
Suburban Manufacturing Company
Customer Service Department
Post Office Box 399
Dayton, Tennessee 37321
[phone], Ext. 1
Forfuture reference, you should record the following information
MODEL NUMBER
SERIAL NUMBER
STOCK NUMBER
DATE OF PURCHASE
Part Number 2031 92
5-8-02