Suburban DYNATRAIL NT-30SP Instructions D'installation page 2

normal heating and operation of the furnace. Failure to provide the minimum
return air will cause erratic furnace cycling.
NOTE: Return air must be from within the living area of the coach.
NOTE: RV's that have a wall of separation to a cargo area (Toy Box) to transport
internal combustion engine vehicles must not have return air openings from this
area.
A. INSTALLATION DIRECTLY AGAINST OUTER SKIN OF COACH
(See Figure 1)
Maximum wall thickness for this type installation is 3".
1. Locate the furnace near lengthwise center of the coach. Do not install the
furance with the vent facing toward the forward end 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 1.
NOTE: Side and top clearances may be 0" for through the wall installations up to
a maximum wall thickness of 3". (See Figure 1.)
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 materials, other than wood may be cut away the
full length and depth of the appliance plus the appliance minimum clearances to
combustibles. (See Table 1.)
4. Cut an opening through the inner wall 12 7/16 x 13". This will allow the rear of
the furnace to be installed against the outer skin of the coach. (See Figure 1.)
5. Cut two 2 1/4" diameter holes through the outer skin of coach as shown in
Figure 1.
6. Put furnace in place, making sure that rear of furnace cabinet is as close to
outer skin of coach as possible and still assure proper vent tube overlap. (See
Installing Vent Assembly).
7. Secure furnace to the floor using the two (2) holes provided in the furnace
cabinet. (See Figure 1.)
8. Install vent assembly. (See instructions for installing vent.)
B. INSTALLATION DIRECTLY AGAINST INNER WALL OF COACH ( S e e
Figure 2)
Maximum wall thickness for this type installation is 2 1/4".
1. Locate the furnace near lengthwise center of the coach. Do not install the
furnace with the vent facing toward the forward end 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 1. 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 materials, other than wood may be cut away the
full length and depth of the appliance plus the appliance minimum clearances to
combustibles. (See Table 1.)
4. Locate center lines for exhaust and intake tubes as shown in Figure 1. Cut
two 2 3/4" diameter holes through coach wall for exhaust and intake. (See Figure
2.)
5. Put furnace in place, making sure that rear of furnace cabinet is as close to
inner wall of coach as possible and still assure proper vent tube overlap. (See
Installing Vent Assembly).
6. Secure furnace to the floor using the two (2) holes provided in the firnace
cabinet. (See Figure 1.)
7. Install vent assembly. (See instructions for installing vent.)
C. INSTALLATION USING VENT EXTENSION TUBES
When it is not possible to install the furnace as described in installations A or B,
extension tubes must be used to connect the exhaust and intake tube to the vent
assembly on the outside of the coach.
Avoid the use of extension tubes whenever possible. If they must be used, it is
important that the correct length tubes are used.
In order to determine the correct extension tube kit, you must determine the
range in which the extension falls. To do this, position the furnace in its permanent
location and measure the distance from the end of the exhaust and intake tube to
the outer edge of the coach skin. This determines the extension tube range you
need. Figure 4 lists by kit number the vent extension range up to 9".
Example: If the distance you measured is 2 7/8", using Figure 4as your guide,
you will order Kit #520498, which accommodates a range from 2 1/4" to 3 1/8".
The extension tube kit comes with complete installation instructions.
WARNING! Under no circumstances are the extension tubes, as supplied
by Suburban, to be cut, altered, or modified in any way. To do so could be
dangerous and will void the responsibility of Suburban Manufacturing
Company.
Model Front Left Right
Side Side
NT-30SP 0" 1" 1"
NT-34SP 0" 2" 2"
0" MEANS TO SPACER BUMPS
CLEARANCE FROM DUCTS TO
COMBUSTIBLE MATERIAL - 1" (See Figure 3)
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! Do not alter the vent assembly supplied with this furnace.
Any modifications 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 2. 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 2.) 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 2.) 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.
5. Attach the vent assembly to the furnace using the special 3 1/4" screw provided.
Insert screw through hole provided in exhaust opening of vent assembly and
secure to bracket in exhaust tube of furnace. This anchors the furnace to the
vent assembly and the outer skin of the RV (See Figure 2.)
CONNECTING GAS SUPPLY
Connect the gas supply to the furnace at the manifold, following the suggestions
outlined below. It will be necessary to hold the flare fitting on the furnace manifold
when connecting or loosening gas line.
NOTE: The compound used on threaded joints must be resistant to liquefied
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 access of 1/2
PSIG.
The appliance must be isolated from the gas supply piping during any pressure
testing of the gas supply piping system at test pressure equal to, or less than,
2
Top Bottom Back Exhaust
and Intake
Tube
0" 0" 0"
0" 0" 0"
-NOTE-
TABLE 1
3/8"
3/8"