Fantech DBF110 User Manual

DBF110 DRYER EXHAUST BOOSTER SYSTEM

INSTALLATION INSTRUCTIONS

DISPOSITIF DBF110 D’AMPLIFICATION DU SYSTÈME DE VENTILATION

DES SÉCHOIRS À LINGE INSTRUCTIONS D’INSTALLATION

SISTEMA DE REFUERZO DE ESCAPE DE LA SECADORA DBF110

INSTRUCCIONES DE INSTALACION

DBF110 DRYER EXHAUST BOOSTER SYSTEM INSTALLATION INSTRUCTIONS

3″

1″

³|₄″

4″

12¹|₂″

9¹|₂″

4″

9¹|₂″

11¹|₄″

4¹|₂″

Installation Guidelines

DBF110 Includes:

1 DBF 110 Dryer Booster Fan
1 Fan Mounting Bracket and Hardware
1 Small Wall Sign Indicating Proper Operating Procedure

mportant Notice

I

Read and Save these instructions for future reference.

Dimensional Data

(DBF110)

Please note: DBF 110 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).

Fan and Switch Mounting

The recommended location of the booster fan is a minimum of 15 linear (not

quivalent) feet of duct from the dryer outlet. If the fan is mounted closer

e
than the recommended 15 feet, it may develop enough pressure to lift wet

int into the fan impeller resulting in excessive lint loading in the fan. The best

l
location for the fan to be mounted is as close as possible to the termination
of the duct work.

dryer and the booster fan, the booster fan may be mounted within the min­imum distance otherwise recommended (See illustration to left).

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 FC vibration isolation clamps
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.

(Exception: If a secondary lint filter is installed between the

(not included)

An NB

or duct

Illustration 1

DBF110

native Location

Alter

Secondar

y Lint T

rap

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 108 feet.

Pressure Sensor Switch Operation

Fantech’s DBF110 is equipped with Fantech's Patented DB10 pressure
switch. The 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 electricity to the booster fan is connected in series through a
normally open terminal on the switch. A pressure tap is connected to a
fitting on the side of the switch. When the dryer begins operation, posi-

essure in the duct causes the switch diaphragm to expand, closing

tive pr
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. 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 pressur
adversely affected by the starting/stopping intervals.

e switch are not

Fan Installation

Step 1. Selecting Fan Location

Fan

must

be mounted a minimum of 15 feet 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.

between the dryer and the booster fan, the booster fan may be mounted
within the minimum distance otherwise recommended (See illustration to

The best location for the fan to be mounted, in any application, is as

left).

close as possible to the ter

ecommended maintenance, fan location should allow suf

r

vice. Refer to dimensional drawings shown above.

for ser

(Exception: If a secondary lint filter is installed

m

mination of the duct work. In or

der to per

ficient access

for

Step 2. Mount Bracket

Using the wood screws provided, attach the mounting bracket to a sup­port beam at the selected location. Bracket is provided with grommets

n order to isolate any vibration and prevent the transmission of sound

i
through the structure. Be careful not to overtighten. Fan mounting can

e in any angle (see ill. 2), however, vertical mounting is recommended

b
to reduce condensation buildup in the fan. If a horizontal installation is

hole

ecessary and condensation buildup may pose a problem, a

n

rilled in the bottom of the housing (along with an NPT insert [by oth-

d
ers] and drain tubing) will allow condensation to drain.

tep 3. Mount Fan

S

For proper operation, the switch diaphragm must be positioned verti-

ally. (Illustrations below show diaphragm position for horizontal, verti-

c
cal and ducts installed at an angle.) Wiring box should be positioned for
easy access. Attach fan to the mounting bracket with the self tapping
screws provided. Care should be taken not to strip the plastic housing.

Although screw pilot holes are not required,
are recommended.

³|₃₂" (or smaller) pilot holes

¹|₄"

NOTE: Steps 2 & 3 may be reversed.

Electrical Connection

DO NOT CONNECT POWER SUPPLY UNTIL FAN IS COMPLETELY INSTALLED.
MAKE SURE ELECTRICAL SERVICE TO THE FAN IS LOCKED IN "OFF" POSI­TION.

1. 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

2.
Hazardous Or Explosive Materials And Vapors."

3.

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 manufac-

turer. If you have questions, contact the factory.

b. Before servicing or cleaning, 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 qual-

ified person(s) in accordance with all applicable codes and

ds, including fire-rated construction.

standar

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.
g. Install fan at least five feet above the floor.

4. WARNING! Check voltage at the fan to see if it corresponds to the
motor nameplate.

GUARDS MUST BE INSTALLED WHEN FAN IS WITHIN REACH OF PERSON­NEL OR WITHIN SEVEN (7) FEET OF WORKING LEVEL OR WHEN DEEMED
ADVISABLE FOR SAFETY.

:

Illustration 2

Correct Mounting of Diaphragm Switch

Horizontal Vertical Angled

Switch mounted
properly above
duct.

Incorrect Mounting of Diaphragm Switch

Illustration 3

Attach Mounting Bracket to
stud using screws provided.

Illustration 4

Switch Cir

cuit

Switch mounted
properly
above and
below
duct.

Attach Fan to Mounting
Bracket using screws provided.

Electrical Supply fr

Breaker Panel

om

N

L

Illustration 5

DBF110 Wiring – Fan and Pressure Switch

Blue

Brown

ed

R

White

Black

Green

Fan Only Wiring

Reference for Troubleshooting Step 8c)

(

Capacitor

Brown (Z2)

Black

Capacitor

eutral

N

15V Line (Supply) Electrical supply, 115V

1

Ground

Terminal block in

fan wiring box

Power
to Fan

Wiring Procedure

Please Note: The fan motor, capacitor and pressure switch connec-

ions are pre-wired from the factory.

t

Step 1.

Remove the screws securing the terminal box cover plate located on
the side of the fan. All fan motor connections are prewired to an elec-

trical terminal strip. A
be needed to secure the wiring through the knockout provided on the
side of the terminal box.

Step 2.

ring incoming electrical service through the romex connector and

B
the fan knockout. Be sure to place the connector nut over the wiring

oming into the terminal box. There are three open ports on the ter-

c
minal strip. Using a small regular screwdriver, tighten the Neutral
(White) wire of the incoming supply under the open terminal labeled
"N". Tighten the Line (Black) wire of the incoming supply under the
open terminal labeled "L". Tighten the Ground (Green) wire of the
incoming supply under the open terminal marked " ". For reference,
a wiring diagram is included on the inside of the terminal box lid.

³|₈" romex type cable restraint connector will

Motor

Leads

Neutral side of

115V supply

Blue (U2)

Black (TK)

Line side of

115V supply

Warranty and Maintenance

Recommended Maintenance

1. Since fan bearings are sealed and provided with an internal lubri­cating material, no additional lubrication is necessary.

2. Fan impeller may accumulate lint. Periodic inspection, based upon
dryer usage, should be performed to ensure that the fan impeller
is not obstructed or loaded with lint. Under normal conditions, fan

Troubleshooting

Important Notice: Prior to performing Steps 1 - 4, be certain that the
electrical supply to the fan/switch is turned off.

If fan fails to start when the dryer cycle begins, please follow the pro­cedure listed below:

1. Check the incoming supply for proper voltage.

2. Consult schematic shown above (also included on inside of fan
wiring terminal lid) to ensure proper connection.

If possible, use a meter to test for continuity across the fan

3.
motor leads. In order to do this, the capacitor and pressure
switch must be disconnected (do not test the capacitor - it will
not meter continuity). If motor leads show continuity, rewire the
fan, capacitor and pressure switch.

4. Turn on the electrical supply and restart the dryer cycle. Check to
be certain that fan starts.

If fan still fails to start after performing Steps 1 – 4, continue follow-

ing the procedure as listed below:

5. Verify that the pressure switch diaphragm is vertical as shown in
Illustration 2 of these instructions. If the diaphragm is not verti­cal, reposition the pressure switch and check for fan operation
against another dryer cycle.

Step 3.

Secure the romex connector. Secure the incoming supply with the
romex connector. Replace the fan terminal box cover.

should be inspected a minimum of every Six (6) Months. Note:
Excessive booster fan noise or vibration may be an indication of
lint buildup on the impeller. To inspect and clean the impeller:

a. Disconnect the incoming power supply at the source.
b. Remove the duct from the fan inlet and remove any lint

buildup on the impeller.

c. Reconnect the duct to the fan. Turn power supply on.

erify that the tubing is not crimped and that the tubing connec-

V

6.
tor nipples ar

e not obstructed.

7. If switch diaphragm is vertical and fan still fails to start, with the
electrical supply on:

a. Remove the tubing from the nipple on the fan and blow

gently into the tubing;

b. If fan starts, consult Fantech for additional technical sup-

port.

8. If fan fails to start after blowing into the tubing:

a. Disconnect incoming power supply at the sour

ce.

b. Remove the pressure switch leads from the wiring terminal

block

c. Connect the incoming power supply directly to the fan

motor as shown in "FR110 Wiring" diagram below.

d. Turn on power to fan.

If fan fails to star

9.

t, please consult Fantech for additional techni-

cal support.