CONNECTING ELECTRICAL SUPPLY
CAUTION: This furnace is designed for negative ground 12 volt D.C. system
only. Do not attempt to alter the furnace for a positive ground system or
connect the furnace directly to
115volts A.C. Damage to!urnacecomponent
,.
-..
parts will occur.
Be sure all wiring to the furnace is of heavy enough gauge to keep the voltage
'
drop through it to a minimum atid to provide enough power for start-up surge. No.
12 gauge wire is recommended. If any of the
orig~nal wire that 1s suppl~ed with the
appliance must be replaced, it must be replaced with type
105"
C or itsequivalent
Power supply connectionsare to be on the
r~ght side of the furnace. The wires are
color coded, red for
positlve
(+)
ar,d yellow for negat~ve
(-).
Th~s polarity must be
observed so the furnace motor
will
run the proper dlrect~on of ro!atlon to Insure
correct air delivery. (See wring diagram
)
If the furnace power supply is to be frorn a converter, we recommend thar the
converter system used to power the furnace be
w~red In parrallel w~th the battery
This
will
serve two purposes.
I.
Provide a constant voltage supply to the furnace.
2.
F~lter any A.C. spikes or volt surges
CONNECTING DUCTS TO FURNACE
The following duct
requiremefits must be followed in orde~ to assure proper
operation of
the furnace:
A. The minimum open duct areas listed below m~~st be maintained throughou!
entire duct system including through register
SF-42F
1
48
SQ. IN.
I
4
1
4"
1
56 SQ. IN.
I
'72 SQ. IN.
'SF-42F
Bottom
Duct roquiros use
of Bottom
Duct Kit,
Part
No.
520753.
MODEL
NOTE: Ducts terminating in a dead air space (like holding tank
compartments) with no means for return air recirculation should not be
counted in the required duct area. Also, ducts
2" in diameter or smaller
should not be counted in the required duct area.
6.
Make the duct connections at the furnace cabinet t~ght. Loose connections will
result in overheating of the component parts on the furnaceand a reduction of the
heated air flow through the duct system.
C. Avoid making any sharp turns in the duct system. Sharp turns will increase the
static pressure in the plenum area and could cause !he
funace to cycle.
SIDE DUCTS
\
D. Avoid making a lot of turns in the duct system. The straighter !he duct system.
j
the better the performance of the furnace.
TOP DUCT
Min. Open
Duct Area
Mia. Open
Duct Area
.
-
.,
E. Maintain a minimum of 11fl clearance where ducrs pass through any
combustible construction, such as coach
catiinetry. (See Figure
3.)
NOTE: UL
listed
duct materials can be
D"
clearance.
BOTTOM DUCT
Min. Open
Duct Area
F. Do not install air boosters in the duct system. Such devices will cause the
furnace to cycle on
lim~t and to have erratic sail switch operation
Min. No.
Ducts Used
N0TE:Aflerinstallationof
the furnaceand duct sysrem iscompleted, adjustments
must be made to obtain a temperature rise within the range specified on the
Rating Plate.
INSTALLING THERMOSTAT
Duct
Size
Locate
[he room thermostat
approximate!^
4-11?. feet above the floor on an inside
bulkhead where it is not affected by heat from any source except room air.
Connect
thermostat wiring to the blue wires on right side of furnace. (See wirlng
diagram.)
PREVENTIVE MAINTENANCE
in which 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 in this manual, then the risk of a fire
andlor the production of carbon monoxide exists which can cause
CAUTION: Label
allwires before disconnecting for servicing. Proper polarity
must be observed so the furnace motor will run with the proper direction of
rotation to insure correct air delivery. (See wiring diagram).
CAUTION: Label all wires prior to disconnection when servicing controls.
Wiring errors can cause
improper and dangerous turnace operation.
Always verify proper operation of furnace after servicing.
Yo~r iurnace should be :ospected by a qualified servlce agency yearly before
turnlny the furnace on. Particular attent~on should be given to the following items.
1. !nspect furnace
installation
and vent termination to be sure furnace is properly
secured in place (see Installation
I~structions), that vent terminates to the
atmosphere, and that vent tubes
oveilap properly (see Installing Vent 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-
...--
/
installation is in accordance with Suburban's i~stallation instructions. (Reference
installation manual supplied with furnace.)
WARNING! It is imperative that the products of combustion be properly
vented to atmosphere and that all combustion air supplied to burner be
drawn from outside atmosohere.
3. Check the base on which furnace is mounted. Be sure it is
phys!cnlly sound.
void of any sagging, deterioration, etc.
4.
lnspect furnace, the venting, ducting and gas pip~ng tc !urnace for obvious
signs of
delerloratlon. Correct any defects at once.
5. lnspect
combust~on chamber for
restrictions
In exhaust or intake. It is
~mperatlve that the flow of ~ntaite combustion air and the flow of exhaust gases
being expelled to the outside atmosphere not be
cbs:ructcd Any soot or loose
debr~s should be blown out using compressed ali (See Flglire
6
)
6.
I~spec! all gaskets If any gaskets show slgns of leakage or deterioration,
replace them Safe
operation
of the furnace depends on all gaskets being tight.
7.
Inspec: retgrn alr Inlet openlngs to the furnace Remove any restr~ct!ons lo
assure adequate
alr 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
ta serious property damage. persvnal inj~ry or loss of Ilfe. If
soot is observed on the vent,
lmmedlately shut the furnace down and contact a
qualif~ed servlce agency
Listed
be!ow are several safety related i!erns that you s!lould follow during the
heatlng season to assure con!inued safe operation of [he furnace
I.
lnspect furnaceventing ?fenling must be free of obstruct~ons, vo~do!soot, and
properly
term~nated fc the atmosphere. (See Installing Vent Assembly.)
WARNING! Do not install screens over the vent for any reason. Screens
will become restricted and cause unsafe furnace operation. Accessories
are being marketed for RV products which we do not recommend. For
your safety, only factory authorized parts are to be used on your furnace.
2.
Per~odically 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, immediately shut
furnace down and contact your dealer or a
qual~fied service person.
3. Keep furnace clean More
frequen! c!eaning may be required due to excessive
l~nt fr~m rarpeting. bedding material, etc It is
imperative
that control
compartments, burners and
circula!ing air passageways of the appliance be kept
clean.
4.
The motor is permanently I~br~cated and requires no oillng.
5. Keep !he furnace area clea: of any combustible materials. gasoline or other
flammable vapor and liquids.
6. Before operating furnace, check the location of !he furnace vent to make sure
ii w~ll not be blocked by the opening of any door on the trailer. If it can be blocked.
do
r~ot operate the furnace wi!h the door open.
7. Do not
resirlct the flow of combustion air or the warrri alr
circulation
to the
furnace. To do so could cause personal injury
and!or death.
8.
Never operate the furnace if you smell gas. Do not assume that the smell of
gas in your
RV
IS
norma! Any time you detecr the odor of gas, ~t is to be
considered
life threatening and corrected immediately. Extinguish any open
flames
i-cluding cigarettes and evacuate all persons from the vehicle. Shu!offgas
supply at LP gas bottle. (See safety notice on f:ont cover of this manual.)
9.
lmmed~ately shti! furnace down and call a service agency ~f furnace cycles
erraticaily 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.
10. Never attempt to repair damaged parts. Always have them replaced by a
qualified
service agency.
11. Never attempt to repalr the furnace yourself. Seek the help of a qualified
service person
12.
Piever restrlct the ducting installed by your trailer nianufacturer. To do so could
cause improper furnace operation.
13. Do not
install
air boosters in the duct system. Such devices will cause the
furnace
15 cycle and to have eira!ic sail switch operation.
14. Clothing or other flammable material should not be placed on or near the
appl~ance
15. Always follow the Operating Instructions. Do not deviate from the step-by-step
procedures.
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
replace any part
of the control system and any gas control that has been
submerged under water.
17. When considering add-on rooms, porch or patio, attention must be given to the
venting of your
furr:ace. For your safety, do not terminate furnace vent inside add-
on
roo,ns, screen porch or onto patios. Doing so will result in products of
combust~on being vented into the room or occupied areas.
18. In any
lnstallation in which 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 pos~tive 'OFF" position and shutting off all electrical and gas
supply to the appliance. Never operate furnace with vent covered
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