Installing The Fireplace - Lennox Hearth Products MPB3328CNE Installation Instructions Manual

2. Measure the square footage of the fl oor space
to be occupied by the system, surrounds and
hearth extensions.
3. Note the fl oor construction, i.e. 2 x 6's, 2 x
8's or 2 x 10's, single or double joists, type and
thickness of fl oor boards.
4. Use this information and consult your local
building code to determine if you need ad-
ditional support.
If you plan to raise the fi replace and hearth
extension, build the platform assembly then
position fi replace and hearth extension on
top. Secure the platform to the fl oor to prevent
possible shifting.

INSTALLING THE FIREPLACE

Step 1. CONSTRUCT FRAMING
Frame appliance enclosure as illustrated in
Figures 6 through 9 on Page 6.
Note: The framed depth, 16 in. (406 mm) from
a framed wall, must always be measured from
a fi nished surface. If a wall covering such as
drywall is to be attached to the rear wall, then
the 16 in. (406 mm) must be measured from
the drywall surface. It is important that this
dimension be exact.
If the appliance is to be elevated above fl oor
level, a solid continuous platform must be
constructed.
The header may rest on the top metal spacers,
but must not be notched to fi t around them.
Consult all local codes.
Step 2. ROUTE GAS SUPPLY LINE
Route gas line (see Figure 10) using techniques
and materials prescribed by local and/or national
codes. It is recommended that a gas line of "
or greater diameter be used to allow full gas
volume to the fi replace. Undue pressure loss
will occur if the pipe is too small. The appli-
ance, as set up at the factory, is best suited for
use with a gas line routed from the right side.
The gas line may however be alternately routed
from the left side.
When rigid pipe is used, an ANSI approved
manual shut-off valve and union must be
installed upstream of the fi replace.
Right Side Front
Corner of Fireplace
Framing
Also see
Figure 4
6 1/2"
(152 mm)
Figure 10 - ROUTE GAS LINE
Ensure that a sediment trap is installed in the
existing gas line, if not, install a sediment trap
upstream to prevent moisture and contaminants
from passing through trap to the appliance con-
trols and burners. Failure to do so could prevent
the appliance from operating reliably.
An external regulator must be used on all pro-
pane (L.P.G). heaters to reduce the supply tank
pressure to 13" w.c. (maximum). Any copper
tubing used to supply propane (L.P.G). from
the tank must be internally tinned.
IMPORTANT
Hold gas valve securely to prevent
movement when connecting to inlet
gas line.
Connecting directly to an unregu-
lated propane (L.P.G). tank may
cause an explosion.
All appliances are equipped with a gas fl ex line
and shutoff valve attached directly to the gas
control valve. Use of the gas fl ex line will aid
in the routing and attachment of the gas line
to the fi replace.
Step 3. POSITION THE APPLIANCE
Slide the fi replace into prepared framing or
position fi replace in its fi nal position and
frame later.
Refer to fi replace drawings and specifi cations
on Page 5 for framing dimensions and details.
Framing header may be positioned directly on
the fi replace top spacers.
IMPORTANT
Under no circumstances can the fi re-
place top spacers (refer to Figure 4)
be removed or modifi ed, nor may
you notch the header to fi t around or
be installed lower than the spacers.
The header may be in direct contact
with the top spacers but may not be
supported by them.
3"
(76 mm)
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
WARNING
The fi replace should be secured to the side
framing members using the unit's nailing
fl anges - two at the top and bottom on each
side of the fi replace front. See Figure 11. Use
8d nails or their equivalent.
Unit Being Secured By Its Nailing Flanges
To The Framing
Figure 11
Fireplace may be anchored to fl oor. Bend down
two anchor tabs (one on each side) located
at the base of the fi replace and secure to the
fl oor by nailing with 8d nails or equivalent
(Figure 12).
Anchor
Tab
Note:
Some units only have one anchor tab on each side.
Figure 12
7