Fantech DBF4XLT User Manual

fantech

Installation and Operation Manual

Manuel d'installation et d'opération

DBF 4XLT

Dryer Booster Fan
Ventilateur d'appoint pour sécheuse

DBF4XLT Kit Includes:

Dryer Booster Fan, 1 pc
Fan Mounting Bracket and Hardware, 1 pc
Indicator Panel w/ 50' (15.4 m) of cable, 1 pc
FC4 Duct Clamp, 1 pc
Tubing & Grommet, 1 pc

Item #: 401456

Rev Date: 2015-05-27

La trousse du DBF4XLT inclus:

Ventilateur d'appoint pour sécheuse, 1 pc
Support de montage du ventilateur avec matériel, 1 pc
Panneau indicateur avec câble de 50pi (15.4 m), 1 pc
Brides de xation FC4, 1 pc
Tuyau et oeillet, 1 pc

United States / États-Unis

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 /

Information Technical

Important

note

Read and Save these instructions
for future reference.

This unit has rotating parts and safety precautions should be exercised
during installation, operation and maintenance.

CAUTION: "For General Ventilation Use Only. Do Not Use To Exhaust
Hazardous Or Explosive Materials And Vapors."

CAUTION: Do not install less than 5 linear feet (1.52 linear meters) from

clothes dryer exhaust outlet.

CAUTION: Do not exhaust air in excess of 167°F (75°C).

CAUTION: Do not install in an exhaust ductwork of a clothes dryer whose

instructions prohibit the installation of a clothes dryer
booster fan.

CAUTION: Insulated dryer duct shall not be used upstream of the

ventilator.

CAUTION: The ventilator must be used in conjunction with high output
dryers.

Practical tip

information

Warnings

DO NOT CONNECT POWER SUPPLY UNTIL FAN IS COMPLETELY INSTALLED.
The DBF4XLT is provided with a 120VAC power cord.

1. WARNING! TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR
INJURY TO PERSONS - OBSERVE THE FOLLOWING:
a. Use this unit only in the manner intended by the manufacturer. If

you have questions, contact the factory.

b. Before servicing or cleaning, unplug power cord or switch power off

at service panel and lock service panel to prevent fan from being
switched on accidentally. When the service disconnecting means
cannot be locked, securely fasten a prominent warning device, such
as a tag, to the service panel.

c. Installation work and electrical wiring must be done by qualified

person(s) in accordance with all applicable codes and standards,
including fire-rated construction.

d. The combustion airflow needed for safe operation of fuel burning

equipment may be affected by this unit's operation. Follow the
heating equipment manufacturer's guidelines and safety standards
such as those published by the National Fire Protection Association
(NFPA), the American Society of Heating, Refrigeration, and Air
Conditioning Engineers (ASHRAE) and the local code authorities.

e. When cutting or drilling into wall or ceiling, do not damage

electrical wires or other hidden utilities.

f. Ducted fans must always be vented to the outdoors.

CAUTION: Do not install in an exhaust ductwork where the equivalent duct

length is < 25 feet (7.62 meters). The DBF4XLT 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).

CAUTION: A secondary lint trap must be installed between the clothes

dryer and the clothes dryer booster fan if the booster fan is
located less than 15 linear feet (4.6 linear meters) from the
exhaust of the clothes dryer.

fantech

2. If a visual error indicator is activated, do not operate the clothes
dryer. See section in this instruction manual titled “Error
Indications”.

Installation Guidelines

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.

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 DBF4XLT can be used on runs up to 130 feet.

Fan and Switch Mounting

The DBF4XLT is to be mounted a minimum of 5 linear (not equivalent)
feet from the dryer outlet. Exception: A secondary lint trap can be used
where required and in applications where excessive dryer lint generation
is likely or to increase the time interval between routine maintenance of
the Dryer Booster Fan. (See illustration on next page). An MB 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.) The duct work to the inlet of the
DBF4XLT is to be attached with the FC4 clamp (included) to permit
periodic inspection of the blower. Refer to maintenance instructions for
inspection recommendations. All duct connections should be properly
sealed to prevent leakage and loss of fan performance. Flex duct (if
allowed by building codes) should be stretched as smooth as possible.

DBF4XLT

FC Mounting
Clamps (optional)

3

Indicator Panel

The DBF4XLT is equipped with a remote mounted low voltage operation
indicator panel. This panel contains an LED that will indicate proper
operation of the booster fan. In the event of a problem with the system,
it will indicate the nature of the problem.

Pressure Sensor Switch
Operation

The DBF4XLT contains 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.

Power to the booster fan is connected in series through a normally open
terminal on the switch. A pressure tap is connected to a nipple 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-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
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.

Alternate Location

Secondary Lint Trap

fantech

4

DBF4XLT Fan/Switch Installation Instructions

Indicator Panel Installation

Step 1. Selecting Panel Location

The DBF4XLT indicator panel mounts near the dryer in a location that will be visible to the
operator of the dryer. The indicator panel is supplied with 50 feet of cable. Ensure that the
indicator panel and booster fan are located to allow their connection with this cable.

Step 2. Wiring and Mounting Panel

The indicator panel is a low voltage device that is not required to be installed in an electrical
junction box. If provided with clearance for the cable and terminal block it can be mounted to a
wall using appropriate fasteners.
If installer chooses to mount indicator panel in a single gang junction box (by others), it should not
be installed in a box that contains line voltage wiring or devices.

On the end of the 50 foot cable with stripped wires connect red wire to the positive (+) position
of the terminal block on the indicator panel. Connect black wire to the negative (-) position of the
terminal block on the indicator panel.

Fan Installation

Step 1. Selecting Fan Location

The indicator panel is supplied with 50 feet of cable. Ensure that the indicator panel and boost
fan are located to allow their connection with this cable.
Fan must be mounted a minimum of 5 linear feet from the dryer outlet. In order to perform
recommended maintenance, fan location should allow sufficient access for service. Refer to
dimensional drawings shown on the next page.

NOTE: Steps 2 & 3 may be reversed.

Step 2. Mount Bracket

Using the 3/4" wood screws provided, attach the mounting bracket to a support beam at the
selected location. Fan mounting can be done at any angle (see illustrations on the top of the next
page), however, vertical mounting is recommended to reduce condensation buildup in the fan. If a
horizontal installation is necessary and condensation buildup may pose a problem, a 1/4" hole
drilled in the bottom of the housing (along with an NPT insert (by others) and drain tubing) may be
installed to allow condensation to drain.

RED

BLACK

Mount Bracket

(use 3/4" long wood screws)

Mount Fan

(use 1/2" long self tapping screws)

Step 3. Mount Fan

For proper operation, the control box (located on the fan) needs to be positioned properly.
Illustrations on the top of the next page show the correct control box position for fans that are
mounted horizontally, vertically and at an angle. The control box should also be positioned to pro­vide access to the indicator panel wiring and the tubing connections. Attach fan to the mounting
bracket with the self tapping 1/2" screws provided. Care should be taken not to strip the housing.
Although screw pilot holes are not required, 3/32" (or smaller) pilot holes are recommended.

Step 4. Connect Indicator Panel Cable

Connect the end of the 50 foot cable that has a two position connector to the receptacle located
on the dryer booster fan control box.

fantech

Mounting Bracket and

Screw Locations

(using the wrong length screws

will damage the fan impeller)

1/4" Max.

Duct Wall

Grommet

Tubing

1/2" Mark on Tubing

Pressure Switch Positioning

1

1

2

2

9

3

/

4

3

3

/

4

6

15

/

16

3

7

/

8

3

7

/

8

Correct Switch Positioning - Diaphragm Positioned Vertically

5

Horizontal Duct

Correct Control Positioning

Incorrect Control Positioning

Dimensions

Correct Control
Positioning

Angled Duct

Incorrect
Control
Positioning

Vertical Duct

Control Correct
in all Positions

All dimensions in inches,

Step 5. Installing Grommet and Tubing

Do not connect tubing in such a manner as to allow

Tubing

Grommet

condensation from the duct to collect in the tubing.

First, drill a 5/16 inch to 3/8 inch diameter hole in

1/2" Mark on Tubing

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

1/4" Max.

duct.) Next, force one end of the tubing over the
nipple on the control. Make a mark a distance of 1/2

Duct Wall

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.

fantech