Combustion Control - Superior Fireplaces WCT6840WS Installation And Operation Instructions Manual

First Fires
Before using the fireplace make sure to remove
the plastic wrapping and EPA label on plated
door. Remove any glue residue left by the
label using mild soap.
Make sure the doors are properly adjusted,
thus avoiding color change to finish due to
overheating.
The first five or six fires should be small fires
of short duration (about 30 to 60 minutes).
This will help cure the refractory bricks. During
the first few fires of this appliance there may
be some odor and smoke due to the curing of
the paint, dust accumulation and burning off of
lubricants used in the manufacturing process. It
may set off a smoke alarm located in the same
room. For this reason the room should be well
ventilated for the first few fires.
HEAT OUTPUT
The WCT6840WS fireplace is the largest member
of the IHP high efficiency fireplaces. The heat
generated from its fire is more efficiently captured
and distributed. In spite of the large amount of
heat that the WCT6840WS fireplace can deliver,
it should not replace the main source of heat in
your home. This fireplace will bring extra warmth
and ambiance to your home by distributing its
heat as described further in the manual.
COMBUSTION CONTROLS
Primary Air and Air Boost Controls
There is no flue damper in the WCT6840WS
fireplace. As is common with air tight appli-
ance, the combustion air control sets the flow
of air entering the firebox. This allows for a
more precise control of the fire. The combus-
tion air control is located below the door on
the left side. The main source of air (primary
air) entering the firebox can be diminished by
moving the air combustion control from left to
right. The primary air is fully opened when the
Figure 1
4
air control is completely moved to the left. This
air combustion control should be in the closed
position when the fireplace is not in operation.
This will minimize air leakage up the chimney.
The combustion air control should be opened
before opening the doors to minimize the possi-
bility of back draft coming into the room (Figure
1-A) More details are available in Refueling For
Best Performance on Page 5.
Time Delayed Air Boost System
The time delayed air-boost system register is
located underneath the door handles. Placed in
the fully opened position, a timer with a maxi-
mum duration of 2 hours is engaged.
The register gradually reduces the amount of air
injected, allowing for a better start of the fire,
whatever the conditions (See sections Building
a Fire and Refueling For Best Performance for
proper sequence of operation). This allows
you to start the fire, set the primary air control
to the desired burn level and the fireplace will
automatically adjust itself to that level once the
fire is fully established (Figure 1-B).
Accelerated Combustion
The maximum heat output for the WCT6840WS
fireplace is achieved by burning with the door
closed and the combustion air opened and pulled
out. Through this method, the WCT6840WS
fireplace can produce up to 80,000 BTU of heat
per hour.
However, it will be necessary to reload with wood
every one or two hours. This is the least efficient
method of burning the WCT6840WS fireplace.
Use caution when firing with the combustion
air control wide open. Only burn cord wood in
this manner. Small dry pieces of softwood and
construction scraps will burn very intensely us-
ing this method and may damage the firebox.
Combustion Air
Register
(A)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Time Delay
Air-Boost Control
(T.D.A.B.)
(B)
Figure 2 - Accelerated Combustion
Medium Combustion
This is the recommended mode of operating
the WCT6840WS fireplace and should be the
one normally used since it will deposit the
least amount of creosote on the glass and in
the chimney. The combustion air control must
be 3/4 closed. The precise setting will depend
on many factors, including chimney length and
the moisture content of the wood.
For instance, a long chimney will necessitate
closing the damper more. To obtain the proper
combustion, close the damper completely, then
open it about 1/2" to 3/4". Three medium size
pieces of cord wood-burning on a bed of hot
coals will generate an approximate heat output
will of 35,000 BTU per hour and the loading time
will be about every 3-4 hours. Softwoods may
be burned using this method but the combustion
time will be substantially reduced.
Figure 3 - Medium Combustion
Slow Combustion
When the air combustion control is completely
closed, the fireplace is in a slow combustion
phase. If the hearth is hot enough, slow com-
bustion will not extinguish the fire, but there
will be a noticeable change in the flame pattern.
The flames will be slow and may appear dirty
if the wood is too wet (moisture content of
20% and more).
Do not allow the wood to burn without flame,
since this will produce excessive creosote in
the unit. Creosote may accumulate on the glass
door. This method of burning should be used
only after operating the WCT6840WS fireplace
with the air control opened to produce a hot
fire for about an hour or at medium pace for at
least three (3) hours. Slow combustion can be
used at night in order to reduce the heat output
and to prolong the burn. The loading time will
be between 6-8 hours and at this combustion
rate, the level of BTU's is at its lowest.