Fantech DBF4XL Installation Instructions page 2

DBF4XL FAN/SWITCH INSTALLATION INSTRUCTIONS
Fan Installation
Step 1. Selecting Fan Location
Fan must be mounted a minimum of 15 feet from the dryer outlet.
the recommended 15 feet, it may develop enough pressure to lift wet lint into the fan impeller
resulting in excessive lint loading in the fan.
tions. In any application, the fan should be mounted as close as possible to the termination of the duct
work. In order to perform recommended maintenance, fan location should allow sufficient access for
service. Refer to dimensional drawings shown below.
Step 2. Mount Bracket
Using the wood screws provided, attach the mounting bracket to a support beam at the selected loca-
tion. Fan mounting can be in any angle, however, vertical mounting is recommended to reduce conden-
sation buildup in the fan. If a horizontal installation is necessary and condensation buildup may pose a
problem, a 1/4" hole drilled in the bottom of the housing (along with an NPT insert and drain tubing) will
allow condensation to drain.
Step 3. Mount Fan
For proper operation, the switch diaphragm should be positioned vertically. (Illustrations below show
diaphragm position for horizontal, vertical and ducts installed at an angle.) Wiring box should be posi-
tioned for easy access. Attach fan to the mounting bracket with the self tapping screws provided. Care
should be taken not to strip the housing. Although screw pilot holes are not required, 3/32" (or smaller)
pilot holes are recommended.
3 7 / "
8
NOTE: Steps 2 & 3 may be reversed.
2"
3 7 /
8
3 7 / "
8
2"
3 7 /
8
Pressure Switch Positioning
Horizontal Duct
Correct Diaphragm Positioning
Incorrect Diaphragm Positioning
*Note: See exception on the front page of these instruc-
1"
6 15 / "
16
3 3 / "
4
1"
2"
"
Dimensional Data
1"
3"
6 15 / "
16
1"
"
3 3 / "
4
Dimensions in inches.
Correct Switch Positioning - Diaphragm Positioned Vertically
Correct Diaphragm
Positioning
If the fan is mounted closer than
9 3 / "
4
9 3 / "
4
2"
Angled Duct
Incorrect
Diaphragm
Positioning
Mount Bracket
Mount Fan
Mounting Bracket &
Screw Locations
Vertical Duct
Diaphragm Correct
in all Positions