Installation Instructions for
DB10 Pressure Sensing Switch Kit
DB10 Kit Includes:
1 DB10 Pressure Sensing Switch
1 3’ Section of Tubing
1 Grommet for Tubing
4 Wire Nuts for Electrical Connection
Pressure Sensing 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 (115VAC).
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.
READ & SAVE THESE INSTRUCTIONS!
DRILLED HOLE IN DRYER DUCT BEFORE
ELBOW. TUBE MUST BE SEALED WITH
GROMMET TO PREVENT LEAKAGE.
PRESSURE TUBE INSERTED 1/4" INTO
PRESSURE TUBE
DB10
RVF4XL EXTERIOR FAN
I
ELECTRICAL BOX
(NOT INCLUDED)
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 intend-
ed for outside use. Locating the switch close to the booster
fan is recommended as this will allow a short wiring connec-
tion 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.
1
