Lennox Hearth CAMBRIA 850 - Manual (Page 5)

Building a Fire
A) To start a fire, place several crumpled up
balls of newspaper in the firebox. Place small
dry pieces of kindling on top of the paper,
criss-crossing the kindling so that there are
air spaces in between. The kindling should
be placed at the center of the firebox so as
to allow for sufficient air circulation.
B) Open the dampers and light the newspaper.
Leave the doors partially opened (1 to 2
inches) to facilitate the start-up.
C) Once kindling fire is well established, cord-
wood can be added. Close the doors and
leave the combustion air control open in
accelerated combustion position.
D) When the fire burns well set the primary
control to the desired burn level.
The unit will burn best with 2-3 pieces of
cordwood spaced 1 to 2 inches apart and
allowing air to get under the fuel. Criss-
crossing or arranging the fuel so that air
can get underneath will help the fire to get
started easily. The unit should be operated
with the air control fully open long enough
to get the cordwood well ignited.
WARNING: The Cambria™ fireplace was de-
signed to allow a spectacular view of the fire.
The Cambria fireplace should never be filled
in excess (five big logs or more). Excessive
fire could damage the fireplace’s hearth and
refractory brick and void the warranty.
REFUELING FOR BEST PERFORMANCE
To reload the Cambria fireplace:
A) Completely open the combustion air control
(see Figure 2).
B) Open the doors about 1” and wait 5 seconds
until the airflow has stabilized. Then open
the doors completely, put the logs in and
close the doors.
C) Set the combustion air control to the desired
burn level.
Notes:
• For spectacular fire and optimization of
the fireplace efficiency, we recommend
that the wood load be placed as far back
as possible.
• It may be necessary to turn off any blower(s)
in operation during the refueling process in
order to minimise smoking in the room. It
is recommended to wait 15 to 30 minutes
before turning the blower(s) back on to
ensure successful rekindling.
SMOKING –
CAUSES AND TROUBLESHOOTING
To reduce the likelihood of smoke coming
into the room when opening the door, set the
combustion air controls to the left (“Acceler-
ated Combustion”) before opening the door.
Your fireplace has been designed and tested
to provide smoke free operation. Occasionally,
there may be a small amount of smoking upon
lighting the fire until the chimney heats up. If
the fireplace continues to smoke it is probably
for one of the following reasons:
A. The doors are partially opened
When you open the doors, open them com-
pletely.
B. Negative pressure in the house
A fire needs air to burn. This air must be
replaced through the outside air duct (see
Outside Air on Page 16). When operating
the Cambria fireplace, open a nearby window
temporarily to check if there is adequate
replacement air supply.
C. Fans operating (e.g.: range hood)
Fans such as range hoods or bath fans draw
air out of the house and may actually cause a
negative pressure in the house. Turn off all
fans and open a nearby window to determine
if this is the cause of the problem.
D. Wet wood
Wet or tarred wood will smoulder and smoke
instead of burning properly. Your dealer can
help you determine if you have properly
seasoned wood for burning.
E. Dirty or blocked chimney
Check to make sure the chimney is clear and
clean. If dirty call a certified chimney sweep
or use a properly sized chimney brush to
clean.
F. Chimney not long enough
The minimum chimney height is 15 feet (4.6
m) not including the fireplace height. The
chimney must extend at least 3 feet (915
mm) above its point of contact with the roof
and at least 2 feet (610 mm) higher than any
roof or wall within 10 feet (3 m) of it. When
installed with offsets, the minimum chimney
height is 18 feet (5.5 m). Additional height
will increase draft and will decrease the
tendency to smoke.
G. Poor chimney draft
With no fire, there should be sufficient draft
to exhaust cigarette smoke introduced under
the baffle. Chimneys installed against an
outside wall without protection may gener-
ate back draft problems which will cause
start-up problems. To prevent this, open
a nearby window; roll up a piece of paper,
light it and hold it in the upper part of the
firebox to warm up the chimney. Wait until
the draft is sufficient, then start the fire.
H. Blower for central forced air kit
Make sure that the blower is at the “off”
position when you open the fireplace door
for reloading.
GAS LOG INSTALLATION
This fireplace is designed to allow the installation
of a gas burner. In such a case, the installation
must conform with the National Gas Code ANSI
Z223.1 and Z21.60. Warning: When using a
gas burner, it is mandatory to keep the chimney
outside air register opened.
This fireplace has provision for the installation
of a gas pipe and is intended only for connection
to a decorative gas appliance incorporating an
automatic shutoff device and complying with
ANSI Z21.60-M96/CGA 2.26-M96, Standard
for Decorative Gas Appliances for Installation
in Solid-Fuel Burning Fireplaces (reference
Clause 4.1.3 T).
1. Remove the 1 inch knock-out on the right
side of the fireplace and on the right side
refractory.
2. Drill a one inch hole in the hearth right side
coaxial to the refractory opening.
3. Assemble a rigid 3/8” N.P.T. iron pipe with
two 90º elbows. Make sure to have 5-11/16”
clearance between the two pipes (see Figure
4).
4. Through the hearth bottom or back openings
insert the mounted pipe through the side
of the firebox and the firebrick. Make sure
the top elbow is as close as possible to the
hearth to keep a minimum clearance to the
retractable door.
5. Insert a pipe through the 1 inch exterior
knock-out and fix it to the 90º elbow already
in place.
Note: In some regions, the use of a flexible gas
pipe is allowed. Consult your local authority.
Figure 4
5-11/16”
(145mm)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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