Fantech DBF110 Installation Instructions

DBF110 DRYER EXHAUST BOOSTER SYSTEM
INSTALLATION INSTRUCTIONS
Positive Pressure Sensor Fan Proving Switch and Fan
DBF110 Kit Includes:
1 FR110 Inline Fan
1 DB10 Switch with Integral Delay
1 Fan Mounting Bracket and Hardware
IMPORTANT NOTICE: READ and SAVE THESE INSTRUCTIONS for FUTURE REFERENCE.

Installation Guidelines

IMPORTANT NOTICE! TO PREVENT THE POSSIBILITY OF DRYER
FAN CAVITATION AND/OR EXHAUSTING EXCESS HEAT REQUIRED
FOR THE DRYING CYCLE AND COMPROMISING DRYING TIMES,
BOOSTER FAN AIRFLOW MUST NOT EXCEED THE DRYER FAN
CAPACITY.
Please note: FR Series inline fans are not explosion proof. Do not use the fans if a
potentially explosive situation may exist.

Fan and Switch Mounting

The recommended location of the booster fan is a minimum of 15
linear (not equivalent) feet of duct from the dryer outlet. If the fan
is mounted closer than 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. The best location for the fan to be
mounted is as close as possible to the termination of the duct work.
Exception: If a secondary lint filter is installed between the dryer and
the booster fan, the booster fan may be mounted within the minimum
distance otherwise recommended (See illustration on left.)
An NB mounting bracket attached to a rafter or joist should be used to
stabilize the fan. Although not recommended, a vertical rigid duct may
support the fan if the duct is securely stabilized. (Consult local codes
prior to supporting the fan in the duct alone.) Duct work should be
attached to the inlet and outlet of the fan by means of vibration isolation
clamps or duct tape. The duct connection should be properly sealed to
prevent leakage and loss of fan performance. Flex duct connections
between the dryer duct connection and exhaust duct should be stretched
as smooth as possible.

Pressure Sensor Switch Operation

Fantech's DB10 is a positive pressure sensing switch which recognizes
dryer operation and activates the booster fan from an independent
electrical circuit. This eliminates connections through the dryer circuit
which may void the manufacturers' warranty as well as manual systems
which require the attention of the operator or costly current/temperature
sensing systems.
The electrical to the booster fan is connected in series through a
normally open terminal on the switch. A pressure tap is connected to a
tip on the side of the switch. When the dryer begins operation, positive
pressure in the duct causes the switch diaphragm to expand closing the
circuit to the booster fan. An integral delay-on-make timer in the switch
will cycle the fan on for intervals of 10 minutes. This will continue until
the dryer has stopped and the timer delay period has lapsed. Drying
cycles, the booster fan, the delay timer and the pressure switch are not
adversely affected by the starting/stopping intervals.
1712 Northgate Blvd. - Sarasota, FL. 34234
Phone: (800) 747-1762 Fax: (800) 487-9915
Phone: (941) 351-2947 Fax: (941) 3593828
Web Site www.fantech-us.com
DBF110599R