atwood Air Conditioners (13500, 15000) - Manual (Page 7)

Roof Thickness -
Inch (mm) –
Include ‘H’
frame if used. Duct length
required – Inch
(mm) Hold down bolt
length required –
Inch (mm)
4.92 (125) 5.71 (145) as
supplied As supplied
3.94 (100) 4.72 (120) - Cut
.98 (25) As supplied
3.15 (80) 3.94 (100) –
Cut1.77 (45) As supplied
2.36 (60) 3.15 (80) – Cut
2.56 (65) Cut 1.97 (50)
1.57 (40) 2.36 (60) – Cut
3.35 (85) Cut 2.76 (70)
1.0 (25) (absolute
minimum) 1.57 (40) – Cut
3.94 (100) Cut 3.35 (85)
ASSESS ROOF THICKNESS
- Measure the roof thickness and consult the
table across to check if adjustments to the
hold down bolt and duct length are required.
Failure to cut the duct properly
can result in an incorrect seal which
will adversely affect the units
performance
ASSEMBLE DUCT
- Thread a hold down bar onto the M8 bolt
and push the bolt almost all the way into the
hole in each corner of the brace (Fig 9)
- Leave a .40 inch gap between the hold
down bar and the recess in the plastic brace.
This will allow for easier engagement with
the four corresponding threaded holes in the
unit.
- Turn the assembly over and add the
extension duct to the top of the assembly (Fig
11).
- Take care to avoid tearing or ripping the duct
apart.
When attaching the duct to the
unit take care to ensure it forms a tight,
unbroken seal that doesn’t allow
discharge air to escape.