Atwood AFLA40 Technical Installation Manual - Page 5

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SMALL VENT INSTALLATION

To prevent moisture from entering inside of coach, apply RTV
type sealant to the back of the bezel flange of the vent part.
Vents are designed to allow water drainage when installed
correctly.
1.
Locate were furnace vent cutout will be made.
Drill 3-1/2" diameter hole through sidewall of coach.
2.
3.
Insert furnace from inside of coach, lining up hole in wall with vent
in furnace.
4.
Apply sealant to back of vent panel extension (plastic part).
5.
Install vent assembly, vent panel extension must be inserted into
air intake tube. Secure vent to wall with 4 screws provided. Vent
assembly must maintain overlaps of 1-1/4" on exhaust tube and
1/2" on air tube. DO NOT exceed maximum wall thickness.
6.
Secure furnace to floor with legs and screws (equivalent type
screws can also be used) provided at back of casing. For vertical
units casing legs can be positioned for placement to secure
furnace

FLUSH DOOR INSTALLATION

To prevent moisture from entering inside of coach, apply RTV
type sealant to all sealing areas.
The door bezel must fit tightly, to prevent water leakage.
Doors are designed to allow water drainage in either horizontal or
vertical installations. Proper location of vent assembly is important
for proper exhausting of fumes and proper function of furnace.
NOTE: RTV type sealant must be applied to the bezel and casing
at the bottom right side to prevent possible water wicking into the
coach. See drawing for areas that must be sealed once bezel is in
place.
Locate and cut-hole location in side wall were unit will be
1.
installed.
Flush mounted doors system requires that the furnace be install
2.
on a 1" high platform for the door cutout to be level with the floor
surface. If not the sidewall can be routed out across the bottom to
the depth of the bezel to create a pocket area.
Apply RTV type sealant to entire back flange of bezel creating a
3.
seal area.
Secure bezel by inserting bezel into wall cutout and securing
4.
through the 10 mounting tabs to the side wall framing. Make sure
that the bezel is tight against the side wall.
Connect the gas line to the valve and push the gas line plug into
5.
casing opening.
The door bezel must fit tightly against sidewall to prevent water
6.
leakage.
Remove excess sealant from around bezel and visually inspect
7.
bezel to make sure it is completely sealed.
Secure furnace with mounting legs provided.
8.
Fasten door and vent with 6 screws provided
9.
Use of foil tape as
alternate sealing
method is acceptable

HARD DUCTING SYSTEMS

When designing hard ducting systems:
Undersize ducting will cause high temperature limiting.
Oversize ducting will cause inadequate air flow from registers
When hard ducting is less then 1-1/2" in depth additional flex
ducting may be needed to maintain static pressure requirements.
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