Fantech DBF4XL Installation Instructions page 3

Tubing
Tubing
1/2" Mark on Tubing
1/2" Mark on Tubing
Duct Wall
Duct Wall
Alternate Installations for Increased Switch Sensitivity in areas of Higher Elevation
Grommet
Grommet and Tubing
and Tubing
Pressure Tap - Located
Pressure Tap - Located upstream of an elbow.
upstream of an elbow
"Pressure Tap" Located at Elbow
Electrical Connection
DO NOT CONNECT POWER SUPPLY UNTIL FAN IS COMPLETELY INSTALLED. The DBF4XL is provided with a 120VAC power cord.
1. This unit has rotating parts and safety precautions should be exercised during installation, operation and maintenance.
2. CAUTION: "For General Ventilation Use Only. Do Not Use To Exhaust 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 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 acci-
dentally. 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.
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.
1/4" Max.
1/4" Max.
90 Degree Elbow
90 Degree
Elbow
Diaphragm Inverted
Installing Grommet and Tubing
First, drill a 5/16 inch to 3/8 inch diameter hole in the duct
Grommet
wall. Carefully insert the grommet into the hole. (Drilling a
Grommet
metal duct may produce burrs. Be careful not to be cut or
pricked by the burrs or the duct.) Next, force one end of the
tubing over the nipple on the switch. It may be necessary to
use a lubricant in order to slide the tubing over the entire
nipple. Make a mark a distance of 1/2 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. Do not
use a lubricant on this end of the tubing.
In order to increase the switch sensitivity for installations in
regions of higher elevation, it may be necessary to rotate
the diaphragm as illustrated. The diaphragm should be
located below the horizontal axis. Please note that due to
gravity, the switch may not release when the diaphragm is
fully inverted. The diaphragm should be rotated in incre-
Plane of Rotation
ments and cycled to be certain that the switch will release
Plane of Rotation
thereby breaking power to the fan. An alternate approach
may be to insert the "pressure tap" in the upstream side of
an elbow. Additional tubing may be required. In the event
that additional tubing is required, be certain that the tubing
connections at the duct wall and the switch are as air-tight
as possible by sealing with a caulking material.