Fantech DBF4XL User Manual

Installation Guidelines
Please note: DBF4XL fans are not
explosion proof.
Do not use the fans if a
potentially explosive situation may exist. DO NOT USE with heated air in
excess 140˚F (60˚C).
Do not install in an exhaust ductwork wher
e the equivalent duct length is <
25 feet (7.62 meters). The DBF4XL is suitable to overcome an equivalent
duct length of 130 feet (40 meters) of 4 inch diameter galvanized steel duct,
and to maintain a air velocity of 1200fpm (6.10 m/s).
Calculating Duct Run
To calculate the length of your planned duct run, measure from the dryer
to external venting point in roof or wall. For each bend or elbow add 5-7
feet to your total duct run calculations. The DBF4XL can be used on runs
up to 130 feet.
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
right). A mounting bracket (included) 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.) It is recommended that duct
work be attached to the inlet and outlet of the fan by means of
FC vibration
isolation clamps (optional) to permit periodic inspection of the blower. Refer
to maintenance instructions for inspection recommendations. All duct con-
nections should be properly sealed to prevent leakage and loss of fan per-
for
mance. Flex duct connections between the dryer duct connection and
exhaust duct should be stretched as smooth as possible.
Pressure Sensor Switch Operation
The DBF4XL contains a positive pr
essur
e sensing switch which r
ecognizes
dryer operation and activates the booster fan from an independent electrical
circuit. This eliminates connections through the dryer circuit which may void
the manufactur
ers’ warranty as well as manual systems which require the
attention of the operator or costly current/temperature sensing systems.
Power to the booster fan is connected in series thr
ough a normally open ter-
minal on the switch. A pressure tap is connected to a nipple on the side of the
switch. When the dr
yer begins operation, positive pr
essure in the duct caus-
es the switch diaphragm to expand closing the cir
cuit to the booster fan. An
integral delay-on-break timer in the switch will cycle the fan on for intervals of
10 minutes. Cycle will reinitiate after a few seconds as long as the dryer is
operating. This will continue until the dr
yer has stopped and the timer delay
period has lapsed. Drying cycles, the booster fan, the delay timer and the pres-
sure switch are not adversely affected by the starting/stopping intervals.
DBF4XL
FC Mounting
Clamps (optional)
Alternate Location
Secondary Lint Trap
Installation Instructions for
Model DBF4XL Dryer Exhaust Booster
READ & SAVE THESE INSTRUCTIONS!
Includes:
1 DBF4XL Dryer Exhaust Booster
1 Fan Mounting Bracket and Hardware
1 Wall Label (Mount on wall near dryer.)
1 Tubing & Grommet

Fantech DBF4XL Specifications

General

Brand	Fantech
Model	DBF4XL
Category	Dryer
Language	English

Summary

Installation Instructions for Model DBF4XL Dryer Exhaust Booster

Installation Guidelines

General advice and limitations for installing the DBF4XL fan, including usage restrictions and duct length requirements.

Calculating Duct Run

Guidance on how to calculate the total equivalent duct length for proper fan installation, including accounting for bends.

Fan and Switch Mounting

Recommended locations and methods for mounting the booster fan and its associated pressure switch for optimal performance.

Pressure Sensor Switch Operation

Explanation of how the pressure sensor switch detects dryer operation and activates the booster fan automatically.

Fan Installation Steps

Selecting Fan Location

Guidance on choosing the optimal location for the booster fan based on distance from the dryer and access for maintenance.

Mounting Bracket Installation

Instructions for securely attaching the mounting bracket to a support beam or structure.

Mounting the Fan Unit

Steps for attaching the fan unit to the installed mounting bracket, ensuring proper orientation.

Pressure Switch Positioning

Illustrations showing correct and incorrect diaphragm positioning for the pressure switch in various duct orientations.

Installing Grommet and Tubing

Grommet and Tubing Installation

Detailed instructions for drilling the duct wall and properly inserting the grommet and tubing for the pressure sensor.

High Elevation Switch Sensitivity

Methods to improve switch sensitivity in high-elevation areas by adjusting tubing and diaphragm placement.

Electrical Connection and Safety

General Electrical Precautions

Instructions regarding power supply connection and general safety during installation and operation.

Risk Reduction Warnings

Critical safety warnings to reduce the risk of fire, electric shock, or injury during fan installation and use.

Recommended Maintenance and Troubleshooting

Recommended Maintenance Procedures

Guidelines for periodic inspection and cleaning of the fan impeller to ensure optimal performance.

Troubleshooting Fan Start Issues

Step-by-step guide to diagnose and resolve issues if the fan fails to start when the dryer cycle begins.

Five (5) Year Warranty Information

Details regarding the product warranty, terms, conditions, and procedures for factory returns.