8. Once the wall facing around the gravity vent grille
adapter has been completed, install the grille with the
supplied screws. The gravity vent is now ready for oper-
ation.
THE CENTRAL HEAT SYSTEM
To install the central host option you will need:
1. Part FD-HC6: A blower transformer relay, a thermo-
stat and a thermo disc (Figure 30).
2. Part FD-HC6-1: A back draft damper (Figure 30).
3. Part FD-HB6: A maximum 636 c.f.m. blower with a
variable speed motor, 2 noise reduction collars, a blower
speed control, and a mounting bracket (Figure 29).
NOTE: Both part numbers must be used together for this
system. Use of any substitutes will decertify the system.
When ducting from the top of the fireplace the 8" back draft
damper prevents hot air from travelling into the ‘C’ vent
(single wall) ducting unless the Central Heat Blower (FD-
HB6) is operating. When the thermostat calls for heat, the
blower turns on and opens the one-way valve. At the same
time, the room air is drawn through the upper and lower
louvers, which mixes and reduces the overall temperature
of the forced air that travels through the ducting.
NOTE: The central heat ducting may be run at a 0" clear-
ance to combustibles.
Warning:
If you are ducting out of the top of the fireplace
and the backdraft damper is not installed, the central heat
ducting will become too hot for the surrounding com-
bustible materials. Any substitute for any RSF kit will void
all liability and warranty coverage by RSF Woodburning
Fireplaces.
Installation
1. Remove the cover to the left on the top of the Delta.
2. Cut the insulation to the size of the opening and slide
the cover plate underneath to the side (it is taped in
place).
3. Install the back draft damper crimped side up, making
sure it is pushed all the way down. Bend out the 4 top
tabs once install bend out the tabs on the lower edge of
the damper in at least 2 places inside the fireplace with a
pair of pliers, so the back draft damper cannot be pulled
out again.
4. Before proceeding with the installation of the blower,
make sure that the electrical service to the blower is in
the “OFF” position. All wiring should be in accordance
with local ordinances and the National Electric Code.
Page 21
DELTA
central heat vari-
able speed blower
blower speed
control
mounting
bracket
noise reduction
collars (2)
Figure 29 : Central heat blower kit (FD-HB6)
top tabs
blower transformer
relay
thermostat
thermo disc
Figure 30: Central heating kit (FD-HC6 and FD-HC6-1)
lower edge tabs
