Fantech DBF 4XLT Installation And Operation Manual - Pressure Switch Positioning
5
fantech
Step 5. Installing Grommet and Tubing
Do not connect tubing in such a manner as to allow
condensation from the duct to collect in the tubing.
First, drill a 5/16 inch to 3/8 inch diameter hole in
the duct wall. Carefully insert the grommet into the
hole. (Drilling a metal duct may produce burrs. Be
careful not to be cut or pricked by the burrs or the
duct.) Next, force one end of the tubing over the
nipple on the control. Make a mark a distance of 1/2
inch from the other end of the tubing. Slide this end
of the tubing through the center of the grommet up
to the mark as illustrated.
1/4" Max.
Duct Wall
Grommet
Tubing
1/2" Mark on Tubing
Control Correct
in all Positions
Incorrect
Control
Positioning
Incorrect Control Positioning
Correct Control Positioning
Correct Switch Positioning - Diaphragm Positioned Vertically
Vertical Duct
Angled Duct
Horizontal Duct
Pressure Switch Positioning
1
1
2
2
1
1
2
9
3
/
4
9
3
/
4
3
3
/
4
2
3
3
3
/
4
6
15
/
16
6
15
/
16
3
7
/
8
3
7
/
8
3
7
/
8
3
7
/
8
Tubing
1/2" Mark on Tubing
Grommet
Duct Wall
1/4" Max.
Correct Control
Positioning
Dimensions
All dimensions in inches,