NOTE: These furnaces shall
be
installed
so
the
electrical components are
protected from water.
These furnaces are design certified for propane/
LP
gas only.
Do
not attempt to
convert to natural gas.
Ga
s supply pressure for purposes of input adjustme
nt:
Minimum -
11
"
WC
.* Maximum - 1
3"
W C. *
(WC
.* - Water Column
).
In the U.S.A., the installation
of
the furnace must be in accordance with local
codes and regulations. In the absence of local codes and regulations, refer to the
la
test edition o
f:
1.
Standard for Recreational Vehicles NFPA 1192.
2.
National Fuel Gas Code ANSI Z22
3.
1 I NFPA 5
4.
3.
Furnace must
be
electrically grounded
in
ac
cord
ance with the latest edition of
the National Electrical Code NFPA 7
0.
In Canada, the furnace must
be
installed in
ac
cordan
ce
with:
1.
Standard CSA Z240.0.2-08
Re
creation
al
Vehicl
es.
2.
CSA Standard Z24
0.
6.2-08/C22.2
N0
.
14
8-08 Electrical Requirements for
Recreational Vehicles.
3. Standard Z240.4.2-08 Installation Requirements for Propane Appliances and
Equipment
in
Re
c
re
ational Vehi
cl
es
.
4. CAN/CGA-B149 Installation Codes.
5.
Any applicable local codes and regulations.
This unit is equipped with
an
electric igniter device
tha
t has
an
energy consumption
of .
1amp@12
volts
D.C
.
WARNING!
Ex
tension tubes cannot
be
u
sed
. If you t
ry
to extend
th
e vent,
it
wi
ll
result in
imp
ro
per i
ns
tallation whi
ch co
uld cause un
sa
fe fu
rn
ace
ope
ratio
n.
There are three
(3)
common methods described
bel
ow for installing the furnace.
Regardless of the method (see
se
ctions
A.
, B
.,
or
C. below) you choose, we
require an opening
be
provided
in
the exterior of
th
e trailer or motor home for
free, unobstructed removal of the furnace. This ex
te
rior, removable panel or wall
section of the trailer or motor home must
be
a minimum of 17-3/4 x
8.
It
is important that adequate return air
be
provided
to
assure normal heating
and
operation of the furnace.
Fa
ilure to provide the m
in
imum return air will cause
erratic furnace cycling. Refer to the chart shown below for minimum return air
requirements.
Return Air Requirements
Model
Minimum Free (unobstructed) Area
SF-20/25/300
55
S
q.
In
.
SF-350
55
S
q.
In
.
SF-420
142 S
q.
In.*
*May
be
reduced
to
88
sq.
i
n.
min.
if
5 ducts are used.
TABLE 1
NOTE: Return air must be from within the living area
of
the coach.
NOTE: RV's that have a wall of separation
to
a
carg
o area (
Toy
Box)
to
transport
internal combustion engine vehicles must not have return air openings from this
area.
A.
INSTALLATION
DIRECTLY
AGAINST
OU
T
ER
PANEL
OF
COACH
(See Figure
1)
(Panel
supplied
by installer)
Maximum wall
thickness
for
this
type installation is
2".
1.
Locate the furnace near lengthwi
se
center
of
th
e coach.
2.
Choose a location for installation out of the way of wires, pipes, et
c.,
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
carpe
ti
ng
, tile or other combustible
material, other than wood flooring, the appliance shall
be
installed
on
a metal
or wood panel extendi
ng
the full width and depth of the appliance. If preferred ,
t
he
carpeti
ng
, tile or combustible materials, o
th
er than wood
ma
y
be
cut
away the full length and depth of t
he
appliance
pl
us
the appliance minimum
clearances
to
combustibles. (See Table 2
.)
4.
Cut
an
opening through the inner wall. This will allow the rear of the furnace
to
be
installed against the outer panel of the
coa
ch.
5. Locate center lines for exhaust
and
inta
ke
, as shown
in
Figure
1.
6. Cut two 2
-1
/4" diameter holes through the outer panel of the coach. (See
Figure
1.)
7.
Put furnace
in
place, making
su
re that rear of
th
e furnace cabinet
is
as
close
to
outer panel of the coach
as
possible and still
as
sure proper vent tube
overlap. (See Installi
ng
Vent Assembly.)
8.
Secure furnace
to
the floor using the two (2) holes provided
in
the furnace
cabinet. (See Figure 4
).
2
9.
Be
sure furnace
is
secured within furnace cabinet. (See Figure
4)
.
10. Install vent assembly. (See instructions for installing vent.)
B.
INSTALLATION
NOT
AGAINST
OUTER
PANEL
OR
SKIN
AND
"X"
DIMENSION
GREATER
THAN
1
'!."
(See Figure
2)
(Exterior panel supplied by installer)
Maximum wall
thickness
for
this
type installation is 2" .
1.
Locate
th
e 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
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 e
x1
ending the full width and depth of the appliance. If preferred,
the carpeting, tile or combustible materials, other than wood may
be
cut
away the full length and depth of the appliance plus the appliance minimum
clearances to combustible. (See Table
2.)
4 Determine "X" dimension
as
shown
in
Figure
2.
The tubes supplied with the
furnace will accommodate
an
installati
on
range for "X" from
o-1
W' . If "X"
dimension is greater than 1
W
',
then special vent tubes as charted
in
Figure 2
must
be
ordered.
WARNING!
Do not alter,
cu
t,
or otherwi
se
modify the vent tu
be
s as sup
pli
ed by
Suburban. D
oi
ng
so
co
uld
re
sult in inadequate
in
take
of
combustion air or improper venting
of
furnace exhau
st.
5.
After determini
ng
"X" dimension, complete the furnace installation as follows:
6.
Locate center lines for exhaust and intake tubes
as
shown
in
Figure
1.
7.
Cut two 2-3/4" diameter holes through the outer panel or outer skin.
(S
ee
Figure 2.)
8.
Put furnace
in
place,
ma
king 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
.)
9.
Secure furnace
to
the floor using the two (2) holes provided
in
the furnace
cabinet. (See Figure 4
.)
10.
Sl
ide furnace into cabinet.
Be
sure furnace is secured within furnace cabinet
(See Figure 4
.)
11
. Install vent assembl
y.
(See instructions for installing vent.)
C.
INSTALLATION
USING
THE
FURNACE
ACCESS
DOOR
SUPPLIED
BY
SUBURBAN
(See
Figure
4)
Maximum wall
thickness
for
this
type
installation is 2
".
1.
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 width and depth of the appliance. If
preferred, the carpeting, tile or combustible matters, other than wood may
be
cut away the full length and depth of the appliance plus
th
e appliance
minimum clearances
to
combustibles. (See Table 2.)
4.
After furnace location has been determi
ned
, cut
an
opening 18-7
/3
2 x
8-
9/3
2"
through the inner coach wall and the outer wall (skin) of the coach.
5.
Caulk aro
und
opening
as
illustrated. Apply generousl
y.
The purpose of the
caulking
is
to
seal the back side of the door frame
an
d the coach skin water
tight.
6.
Secure frame
to
outer wall
(s
k
in
) through the holes
in
the 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
sh
o
uld
be
installed against or
as
close as possible
to
the flange
on
the door frame. (See illustration
.)
The
furnace must
ma
intain 1 /2" overlap
on
the intake and
1-1
/4" overlap
on
the
exhaust.
8.
Se
cure furnace
to
the floor using the two
(2
) holes provided
in
the furnace
cabinet. (See Figure 4.)
9.
Slide furnace i
nt
o cabinet.
Be
sure furnace is secur
ed
wi
t
hin
furnace cabinet.
(See Figure 4
.)
10. Position furnace access door over the frame.
Se
c
ure
the door
to
the
coach
skin.
Be
sure the coach skin is of sufficient strength
to
keep furnace access
door
in
place and insure a tight seal. It may
be
necessary
to
build a wood
or metal frame around the opening
in
order
to
provide adequate strength for
securi
ng
door.
CAUTION: The screws provided with the
door
may
not
be
of
suff
i
cient
length and size
for
all
app
l
ications
and
it
may be necessary
for
the
installer
to
substitute
screws in
order
to
adequately secure the furnace access
door
.
11. Install vent assembl
y.
(See instructions for installing vent.)
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