Instructions / Assembly

8
Installing the water heater
Installation Methods
Inspect shipment. — Inspect the water
heater for possible shipping damage.
Placement of water heater. — Locate
the water heater as desired, make
certain the minimum clearances
outlined in this manual are observed.
Combustion and ventilation air. —
Air for combustion and ventilation
must not be supplied from occupied
spaces of the mobile home. The air
inlet must not be obstructed under any
circumstances. Outside air is
necessary for proper and safe
operation of the water heater.
Openings for air inlet and gas vent
roof jack assemblies.
— (Refer to
illustrations to the left.) Cut a 7
1
/ 4 in.
diameter hole in the ceiling and roof
directly above the flue of the water
heater. Remove the water heater and
drop a plumb line from the center of the
hole in the roof to the floor. Mark this
water heater center point on the floor.
Mark a "new point" on the floor 4
3
/ 4 in.
toward the front from the water heater
center point for a 30 gallon model, or
5
3
/ 4 in. toward the front from the water
heater center point for a 40 gallon
model. For a 50 gallon model, mark a
"new point" 4
3
/ 4 in. to the right and 4
3
/ 4
in. toward the front from the water
heater center point. Cut a 4
3
/ 4 in.
diameter hole in the floor and underside
sheathing using the "new point" as the
hole center.
AIR INLET ASSEMBLY — (Refer to
illustrations to the left.)
NOTICE — Installation of this Direct
Vent water heater with the Air Inlet
Assembly taking it’s combustion
air from a basement atmosphere is
a violation of UL 307b, Section 4.3
(c). For installation over a basement
structure or unvented crawl space,
provisions must be made to provide
fresh combustion air from outside the
dwelling. A factory manufactured Side
Air Inlet Kit (Part No. AP12191) may
be purchased from the factory and
installed according to the instructions
supplied with the kit.
To accommodate variations of installation
configurations, an adjustable Air Inlet
Assembly is available (Purchased
separately). To adjust it, measure the
distance from the 4
3
/ 4 in. diameter hole
in the floor (refer to number 4) and the
approximate mid-point of the space
between the bottom sheathing and the
ground, and record the dimension. Adjust
the telescopic lower tube of the inlet
assembly until the distance between the
bottom of the floor flange to the bottom
of the telescopic tube is equal to the
dimension below the floor recorded earlier.
With the tube adjusted to the correct
length, secure the lower telescopic tube in
place with the screws provided. A silicone
rubber sealing band is provided with the
inlet assembly, and must be pulled up over
the joint between the tubes to ensure leak
proof seal.
Now drop the Air Inlet Assembly into
the 4
3
/ 4 in. diameter hole in the floor and
fasten in place at this time with the screws
provided.
Relocate the water heater so the air inlet
collar, that extends below the water heater
bottom pan, aligns with the Air Inlet
Assembly tube projecting through the
floor. Close off the opening between the
top of the Air Inlet Assembly tube and the
water heater air inlet collar with the clamp
provided
Align the water heater flue with the opening
previously cut in the ceiling and roof. The
opening around the Air Inlet Assembly and the
bottom sheathing must be sealed to prevent
the entrance of rodents. When the mobile
home is tightly skirted, an air inlet opening in
the skirt must be provided. The opening must
have a minimum free area of at least 9 square
inches. If the opening is screened or covered
with a louver, the total free area must be at
least 9 square inches.
Center Line of 7¼"
Diameter Hole in Roof
and Ceiling
Center Point
of Heater
4¾" for 30 Gallon Heater
5¾" for 40 Gallon Heater
4¾" Diameter Holes
Through Floor and
Sheathing
FRONT OF HEATER
For 30 & 40 Gallon Heaters ONLY!!
Center Point
of Heater
4¾" Diameter Holes
Through Floor and
Sheathing
FRONT OF HEATER
For 50 Gallon Heater ONLY!!
4¾" to the right of the center line
of heater and
4¾" towards front of heater