Viking DBCV3638 Installation Manual page 11

ROOF INSTALLATION
EXTERIOR-POWER VENTILATOR
Exterior Power Ventilator
(also see instructions supplied with ventilator kit)
1. Locate the blower on the rear slope of the roof. Place it
in a location to minimize duct run. The location should
be free of obstacles (T.V. leads, electrical lines, etc.). Bear
in mind, if the blower top is level with the roof peak, it
will not be seen from the street. Keep this approximate
location in mind as you work from within the attic.
2. Mark a point halfway between rafters.
3. Drill a guide hole through the roof at this point.
4. From the outside, use the guide hole as a starting point
to lay out the installation.
A. Use a T-square to measure 9
left of the guide hole, then 12
locate the top-left corner of the layout.
B. Starting from the top-left corner, mark the
rectangular cutout and remove only the shingles in
this area.
5. Mark an 11" (27.9 cm) diameter hole centered on the
guide hole. Mark the center of the 1
diameter electrical wiring hole.
6. Cut out the roof board(s) along the 11" (27.9 cm)
diameter circle and drill a 1
7. For flat roof installations, build a curb that will mount the
blower at a minimum pitch of 2/12. Discharge end of
the blower should be pointed away from prevailing
winds.
8. Remove roofing nails from the shingles around the top
and sides of the cutout area only. Carefully lift the
shingles to allow the back flashing sheet on the blower
housing to fit under them.
9. Center the blower ring in the 11" (27.9 cm) diameter
hole, making sure that the 1 ¼" (3.2 cm) diameter
electrical wiring hold aligns with the hole in the wiring
box.
10. Attach the blower to the roof with the six screws
provided. It is recommended that the screws be located
inside the blower housing. All six holes in the back
panel must be filled, or any moisture that may get inside
the housing could leak into the house.
11. Using a good grade of roofing cement, seal all of the
shingles around the housing and flashing sheet as well
as the mounting screw heads.
12. Bring electrical wiring through the hole in the wiring box
and secure it according to local codes.
13. Make the electrical connections with the proper
connector for the type of wiring being used. Connect
white to white, black to black, and the green or bare
wire to green.
14. Replace wiring box cover and screws. Do not pinch
wiring under the cover.
15. Check for free movement of the damper before
installing housing cover and screws.
16. Turn on power and check operation of the blower.
13 /16
" (24.9 cm) to the
11 /16"
(32.2 cm) to
1 /4
" (3.2 cm)
1 /4
" hole as marked.
ROOF CUTOUT
REMOVE
SHINGLES
12 11 /16"
(32.2 cm)
1 /2
29 "
(74.9 cm)
D
A
DEV1200 18"
(45.7 cm)
DEV1500 21"
(53.3 cm)
Ground to
grounding
screw
11
1 /4" (3.2
1
cm) dia. hole
B
C
A
2" (5.1 cm)
2" (5.1 cm)
B C
15" 9 13/16'
(38.1 cm) (24.9 cm)
18" 12 5/8"
(45.7 cm) (32.1 cm)
Black to
Black
White
to Blue
20 1 /2"
(52.1 cm)
11" (27.9 cm)
dia. hole
7"
(17.8 cm)
D
22"
(55.9 cm)
25"
(63.5 cm)
120 VAC
Line In