Fantech DB10 User Manual

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Installation and Operation Manual

DB10 Kit

Pressure Sensing Switch

DB10 Kit Includes:

DB10 Pressure Sensing Switch, 1 pc
3’ Section of Tubing, 1 pc
Grommet for Tubing, 1 pc
Wire Nuts for Electrical Connection, 4 pcs

Item #: 412811

Rev Date: 040314

United States

10048 Industrial Blvd., Lenexa, KS, 66215
Tel.: [phone] • Fax: [phone]

Canada

50 Kanalflakt Way, Bouctouche, NB, E4S 3M5
Tel.: [phone] • Fax: [phone]

2

Note Warning /

Important

Information Technical

information

Practical tip

note

Read and Save these instructions
for future reference.

Pressure Sensor Switch Operation

The DB10 is a positive pressure sensing switch that is used with a dryer exhaust booster fan. A booster fan is recommended where dryer output alone
is insufficient to maintain adequate airflow in a long dryer exhaust duct run.
The DB10 senses dryer operation and activates the booster fan from an independent electrical circuit (120VAC).

The electrical supply to the booster fan is connected in series through the DB10 switch. One end of a pressure tube is connected to a nipple on the
switch, the other end of the tube is tapped into the dryer duct through a grommet.
Within ten seconds of the dryer beginning operation, positive pressure in the duct causes the switch diaphragm to close, activating the electronic timer
circuit. The timer directs power to the fan in consecutive five minute cycles, effectively providing continuous boost as long as the dryer is on. When the
dryer finishes its operation, the fan will complete the five minute cycle that it had started before the dryer stopped and then it will begin one final clearing
cycle of five minutes. This means that the fan will continue to run for between five and ten minutes after the dryer has stopped.

Installation Instructions

Step 1. Selecting Switch Location

The DB10 switch can be located anywhere along the dryer duct between
the dryer and the fan. The switch is not intended for outside use.
Locating the switch close to the booster fan is recommended as this will
allow a short wiring connection between the switch and the fan.

The DB10 should be connected to an electrical wiring box (not included)
as shown. The electrical box should be permanently attached to a wall
or other building structure.

PRESSURE TUBE INSERTED 1/4" INTO
DRILLED HOLE IN DRYER DUCT BEFORE
ELBOW. TUBE MUST BE SEALED WITH
GROMMET TO PREVENT LEAKAGE.

DB10

ELECTRICAL BOX

(NOT INCLUDED)

PRESSURE TUBE

RVF4XL EXTERIOR FAN

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Step 2. Mount Switch

Switch must be positioned so
that diaphragm is maintained
in vertical plane.

Pressure Switch Diaphragm Positioning

Insert the DB10 conduit connector through a knock-out in the electrical
box and secure with the nut as shown.

3

PRESSURE

TUBE

Step 3. Installing Grommet and Tubing

Note

Grommet should be mounted no more than 30 inches from the
pressure switch in order to allow the tubing to reach from the switch to
the duct.

GROMMET

DRYER EXHAUST DUCT WALL

PRESSURE TUBE INSERTED

1/4" INTO DRYER DUCT

First, drill a 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 switch. It may be necessary
to use a lubricant in order to slide the tubing over the entire nipple.

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. Do not use a lubricant on this end of the tubing.

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