General Installation; Gas Connection; Product Damage - Atwood MPD 90222 Installation Manual

gEnEraL inStaLLation

The following instruction describes the most common type
of installation for the water heater. However, there are other
approved methods such as baggage compartment and flush
mounting. Consult your Field Auditor, Account Manager, or the
Atwood Service Department if you have additional questions.
These steps assume the proper location has been determined
and is being installed at the OEM prior to erecting the walls.
noTe: Parts bagged and included with the unit include corner
filler brackets, flue screen, and cover hole bushing.
1. Locate the water heater on the floor of the coach at pre-
determined location. The unit must be permanently
supported at the same level as the bottom of the sidewall
cutout (by the floor or a raised floor).
2. To install the unit on carpeting, assure the addition
of metal or wood under the unit is added and extends
a minimum of three inches beyond the width and
depth of the appliance enclosure. Minimum clearance
requirement is zero (except front door for proper operation
and service).
3. If risk of future connection leakage and damage of
adjacent area is of concern, install a drain pan under the
unit with drainage to outside of vehicle.
4. Connect plumbing to water lines taking care to make
correct "COLD" and "HOT" orientation. Connect 3/8" FM
flared LP gas line to 3/8" M flared gas fitting.
a. Allow flexibility in water and gas lines so the unit
can be pulled through the sidewall opening at lease
one inch past the skin, allowing for sealing step.
b. Assure the water and gas line grommets continue
to be intact and properly inserted in the case holes,
with no gaps or openings where the line passes
through the case.
Cold In

Gas Connection

m

PrODUCT DAMAGe

Gas connection must be made using TWO (2) wrenches
to avoid twisting and damaging line.
Damage voids the Warranty!
Hot Out
caution
5. Erect the side walls and cut the opening or orient the
pre-fabricated opening. Frame with 2" x 2" lumber (or
equivalent).
6. Pull the unit outward through the opening and bend all
four flanges outward 90 degrees along the lanced lines.
Installation in standard 6 gallon water heater opening with
Standard Door Kit
Adapter
Installation in standard 10 gallon water heater opening with
Large Door Adapter Kit
7. To prevent water leaks, caulk thoroughly around the
backside of the flanges over the lanced bend slots. Caulk
the perimeter of the opening (or substitute 1" x 3/8" Butyl
Tape).
8. Push the unit to the wall against the caulking and secure
the corner brackets behind the unit flanges but snug to
the corner of the enclosure. Complete the installation
by inserting #8 screws in all the flange holes.
an "air tight" seal must be the final result.
2
Corner Brackets
(4)