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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 gas vent Co-Axial Roof Jack
assembly.-
Cut a 7 1/4 in. diameter
hole in the ceiling and roof directly
above the flue of the water heater.
Securing the water heater. Secure the
water heater using the provided metal
straps. Attach them to the top pan and
bottom pan of the water heater then
fasten the straps to the adjacent wall on
each side.
Gas vent Co-Axial Roof Jack. The roof
jack must be one of the models
listed in this manual, and marked as
approved by Underwriters
Laboratories, Inc. for use on
manufactured homes (mobile
homes). The installation
instructions supplied with each
Co-Axial Roof Jack must be
observed to obtain the proper roof
jack installation.
The Gas Vent Roof Jack Assembly
has a multi piece telescopic vent
connector pipe consisting of an
upper, center and lower section that
must be pre-adjusted according to
the following directions prior to final
installation of the roof jack.
From the water heater location, measure
the distance from the highest point on roof
opening to the top of the water heater.
Select correct size Co-Axial Roof Jack
from Co-Axial Roof Jack Sizing Guide
on Page 9, Dimension X. Remove the
Co-Axial Roof Jack from its carton, and
extend the center section of the inner
most pipe to its maximum length by
grasping the pipe and sliding the center
section of pipe downward. Then extend
the the lower section of the inner pipe
in the same manner to its full extension.
Silicone rubber sealing bands are provided
and must be pulled down over the joints
between the tubes to ensure a leak proof
seal.
Apply a non-hardening mastic on the roof
around the previously cut hole to form a
weather tight seal with the roof flange of the
Co-Axial Roof Jack Assembly. Insert the
Co-Axial Roof Jack through the opening
in roof from above, and fasten the flashing
to the roof using the pre-punched holes in
the flashing. The roof flange adjusts to
accommodate installation on a pitched roof,
(maximum allowable pitch is 8-12).
For roof pitches greater that 8-12 an alternate
roof jack can be purchased. Apply additional
non-hardening mastic as required to complete
the weather seal.
To complete the assembly of the Co-Axial
Roof Jack Inner Pipe installation: Apply
silicone sealant around the outside of the
water heater flue pipe, then extend the
lower section of the vent connector pipe
by grasping the center section of pipe,
ensuring that the silicone rubber seal
remains in position over the joint, press it
firmly downward until seated over the flue
pipe protruding inside the water heater’s
top plenum. An improper seal can cause
nuisance pilot outages. Secure the inner
pipe to the top pan of the water heater
by inserting the two screws through the
brackets on each side.
To complete the assembly of the Co-Axial
Roof Jack Outer Pipe installation: Extend
the upper section down and over the
lower section of the vent connector pipe
by grasping the center section of pipe and
pull downward, ensuring that the silicone
rubber seal remains in position over the
joint, press it firmly downward until
seated outside the lip of the top plenum
Secure on each side with the two screws
provided. Apply silicone sealant around
the edge of the top plenum and outer pipe
connection to ensure a good seal. An
improper seal can cause nuisance pilot
outages.
NOTICE: The water
heater should not be
installed near an air supply
containing halogenated
hydrocarbons.
NOTICE: The old roof
jack must be replaced with
the new co-axial roof jack.
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