blower noise does not affect rooms you would like kept
quiet. If the central heating system duct work is passing
through an area in your home that you do not wish to be
heated, then the ducting should be insulated. Length of runs
should be as short as possible to conserve space and mini-
mize cost. There is a loss of about 15% performance at 50
feet. Also: for your safety the blower automatically shuts
off if the air temperature reaches 180° F inside the ducting.
5. Locate the blower in a convenient location. The blower
may be installed vertically or horizontally. The horizontal
installation can utilize either the supplied mounting brack-
et or, if you want to install the blower farther away from
the ceiling, you can use plumber’s strapping. A vertical
installation must include the mounting bracket.
NOTE: If you have an existing hot air system, you may safe-
ly tie-in to this hot air system. However, no hot air duct is to
be connected to the return air of another central heat-
ing system.
6. Connect the INLET of the blower to the ducting coming
from the fireplace, using 8" diameter metal ducting (rigid
or flex). Any other size will not work properly. Use only
metal ducting between the fireplace and the blower. You
may use plastic ducting after the blower, provided the
temperature rating of the ducting is at least 250°F. Do
not use plastic ducting in a chase.
7. To install the blower (for the FDHB6 blower only), attach
the noise reduction collars to either side of the blower
using 1/2" self-tapping screws.
8. Duct-work can then be run to the desired rooms. Up to
six - 5" or five - 6" diameter runs can be installed from this
system.
NOTE: Runs must be balanced as air travels along the path
of least resistance. Balance the air flow by diameter and
length of runs. Longer runs should have larger diameters.
Houses vary in size and layout, so duct systems must be
specifically designed for each home. The diagrams on
this sheet are examples only. The cross sectional area of the
distribution system must total at least 50 square inches. If
you have more than 50 square inches, some of the system
may be shut off, but there must always be 50 square inches
of ducting open at all times. For example, if 5" pipe is used
for distribution, the cross section of each is 20 square inch-
es. The minimum allowable ducting would be three runs
of 5" pipe.
(Figure 33 and 34) illustrate two examples of tying in to exist-
ing duct work. Directing air in the right direction will reduce
reverse flow when the existing furnace blower is off. Some
reverse flow will not cause any problems.
CAUTION: Tie-ins into existing duct work must be down
stream from the existing furnace.
NOTE: When the central heating blower is in operation, it
removes air from the room containing the fireplace. If this
room can be closed off from the rest of the house (e.g. with
a door), a grille with at least a 100 square inch open area
Page 20
DELTA
black
white
ground (bare)
speed
control
thermo-
stat
BLACK for
heating ther-
mostat.
RED for cool-
ing thermo-
stat.
to thermostat
to terminal
NBV
blower control
detail
blower
blower
control
terminal
terminal detail
Figure 32: Wiring for the central heat system
110 V
Colours are represented as fol-
lows (unless otherwise noted)
to speed
control
to blower
