Suburban SF-25 Installation Instructions

WARNING ! Do not alter, cut, or otherwise modify the vent tubes as
supplied by Suburban. Doing so could result in inadequate intake of
combustion air or improper venting of furnace exhaust.
5. After determining “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. (See
Figure 2.)
8. 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.)
9. Secure furnace to the oor using the two (2) holes provided in the furnace
cabinet. (See Figure 4.)
10. Slide furnace into cabinet. Be sure furnace is secured within furnace cabinet
(See Figure 4.)
11. Install vent assembly. (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 ooring, 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 18-7/32 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 is to seal the back side of the door frame and the coach skin water
tight.
6. Secure frame to outer wall (skin) 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 should be installed against
or as close as possible to the ange on the door frame. (See illustration.) The
furnace must maintain 1/2” overlap on the intake and 1-1/4” overlap on the
exhaust.
8. Secure furnace to the oor using the two (2) holes provided in the furnace
cabinet. (See Figure 4.)
9. Slide furnace into cabinet. Be sure furnace is secured within furnace cabinet.
(See Figure 4.)
10. Position furnace access door over the frame. Secure the door to the coach
skin. Be sure the coach skin is of sufcient 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 securing
door.
CAUTION: The screws provided with the door may not be of sufcient
length and size for all applications and it may be necessary for the installer
to substitute screws in order to adequately secure the furnace access
door.
11. Install vent assembly. (See instructions for installing vent.)
Left Right Exhaust and
Model Front Side Side Top Bottom Back Intake Tube
SF-20 1” 0” 0” 0” 0” 0” 3/8”
SF-25 1” 0” 0” 0” 0” 0” 3/8”
SF-30 1” 0” 0” 0” 0” 0” 3/8”
SF-35 1” 0” 0” 0” 0” 0” 3/8”
SF-42 1” 2” 2” 1” 0” 0” 3/8”
-NOTE-
0” MEANS TO SPACER BUMPS
CLEARANCE FROM DUCTS TO
COMBUSTIBLE MATERIAL - 1/4” (See Figure 3)
TABLE 2
INSTALLING VENT ASSEMBLY
The vent outlet must be installed so it is in the same atmospheric pressure zone
as the combustion air intake. The exhaust and intake tubes must be installed
from the outside, pass through the RV skin and slide onto the furnace exhaust
and intake.
WARNING! Discard the vent assembly that came with the furnace. The
vent cap assembly supplied with the vertical mounting kit must be
used. Suburban recommends all vents be installed using the rain shield
supplied.
Do not alter the vent assembly supplied with this furnace. Any
modications will result in improper installation which could cause
unsafe furnace operation.
CAUTION! Combustion air must not be drawn from the living area. All air
for combustion must be drawn from the outside atmosphere. All exhaust
gases must be vented to the outside atmosphere - never inside the RV.
Therefore, it is essential to insure that the vent cap and tube assemblies
are properly installed.
1. Apply caulking to RV skin behind vent cap as shown in Figure 1. Apply caulking
generously around perimeter of vent cap and across center as shown.
2. Insert intake tube through RV skin and slide it onto the furnace intake (See
Figure 1.) Minimum tube overlap of 1/2” is required.
3. Insert vent cap exhaust tube through RV skin and slide it onto the furnace
exhaust (See Figure 1.) Minimum tube overlap of 1 1/4” is required.
4. Attach vent cap assembly to outer skin of RV with the six (6) screws provided.
Do not install vent assembly upside down. The word “Suburban” must be right
side up.
CONNECTING GAS SUPPLY
CAUTION: This furnace was shipped from the factory set up for the gas
connection to be made at the right rear of the unit as illustrated in Figure 1.
If you wish to make gas connection through the top of cabinet, you must
remove furnace from cabinet and turn gas inlet ttings 90° CLOCKWISE.
DO NOT TURN FITTING COUNTER-CLOCKWISE, this will loosen tting and
result in a gas leak.
WARNING! Hold manifold rmly when turning elbow to prevent any
force from being inserted on the valve and to prevent any leaks from
developing. Be sure to check all tting for leaks including the inlet and
outlet on the valve before reinstalling furnace into cabinet. Correct all
leaks immediately. NOTE: The furnace must be in operation to properly
check for leaks.
Connect the gas supply to the furnace at the manifold, following the suggestions
outlined below. It will be necessary to hold the are tting on the furnace manifold
when connecting or loosening gas line.
NOTE: The compound used on threaded joints must be resistant to liqueed
petroleum (LP) gas.
NOTE: The appliance must be disconnected from the gas supply piping system
during any pressure testing of that system at test pressure in excess of 1/2
PSIG.
3

Suburban SF-25 Specifications

General

Brand	Suburban
Model	SF-25
Category	Furnace
Language	English