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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX MERIT
®
SERIES B-VENT GAS FIREPLACES • 42" LMBV MODELS • INSTALLATION INSTRUCTIONS
All appliances are equipped with a gas ex line
and shutoff valve attached directly to the gas
control valve. To quickly and easily complete
the gas line routing, use the gas ex line kit.
Step 2. Route gas line (Figure 8 ) using tech-
niques and materials prescribed by local and/
or national codes. It is recommended that a
gas line of 1/2" or greater diameter be used to
allow full gas volume to the fireplace. Undue
pressure loss will occur if the pipe is too small.
The appliance, 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 alter-
nately routed from the left side.
Figure 9
6” Type B
Vent
Flue Outlet
Collar
12 ft.
Minimum
60*
degrees
Maximum
Back View
Of Appliance
12 ft.
Minimum
Back View
Of Appliance
*12 ft. Min.
**15 ft. Min.
2 ft.
Minimum
To Offset
*with an offset up to 45 degrees
** with an offset greater than 45
degrees and up to 60 degrees
Back View
Of Appliance
*This Vent Configuration
Allowable only With The
Following optional Non-
Operable Glass Doors Installed:
42GEP or 42GEP-BB
Figure 10
WARNING: CONNECTING DIRECTLY TO
AN UNREGULATED PROPANE (L.P.G.)
TANK MAY CAUSE AN EXPLOSION.
Step 4. Install the Vent System and Exterior
Termination -
A - Connect a 6" (152 mm) Type B vent system
to the appliance ue collar with four (4) No. 8
sheet metal screws (Figure 9 ) and install the
remainder of the Type B vent to the outside.
B - The following venting configurations may
be installed (see Figure 10 ):
1 - Vertical - Minimum overall height of the
vent system and appliance without an offset
must be 12' (3.66 m)
2 - With Offset
a - Minimum overall height of the vent system
and appliance must be 12' (3.66 m) when an
offset up to 45 degrees from the vertical is used.
There must be a minimum vertical vent height
of 2 ft (0.6 m) above the appliance collar before
the offset can be applied.
b - Minimum overall height of the vent system
and appliance must be 15' (4.57 m) when an
offset, more than 45 degrees but less than 60
degrees from the vertical, is used. There must
be a minimum vertical vent height of 2 ft (0.6
m) above the appliance collar before the offset
can be applied.
3 - With Offset, when using the optional, 42GEP
or 42GEP-BB, non-operable glass doors
Minimum overall height of the vent system and
appliance must be 12' (3.66 m) when an offset
up to 60 degrees from the vertical is used. The
lower part of the offset may start at the appli-
ance ue collar.
Step 3. Slide the fireplace into prepared fram-
ing or position fireplace in its final position
and frame later.
Refer to fireplace drawings and specifications
on pages 4 and 5 for framing dimensions and
details. Framing header may be positioned
directly on the fireplace top spacers.
IMPORTANT: UNDER NO CIRCUMSTANCES CAN
THE FIREPLACE TOP SPACERS (FIGURE 2 ) BE
REMOVED OR MODIFIED, NOR MAY YOU NOTCH
THE HEADER TO FIT AROUND OR BE INSTALLED
LOWER THAN THE SPACERS. THE HEADER MAY
BE IN DIRECT CONTACT WITH THE TOP SPAC-
ERS BUT MAY NOT BE SUPPORTED BY THEM.
Fireplace should be secured to side framing
members using the full length 1/2 inch nailing
anges that are integral to the appliance at each
side. Use 8d nails or equivalent.
Note: The nailing tabs and the area directly
behind the nailing tabs are exempt from the
clearances described on the fireplace clear-
ance label.
Figure 8
RIGHT
SIDE
7-5/8"
(194 mm)
3-1/8"
(79 mm)
Note: Ensure the Millivolt valve wire is not
routed through the same hole as the gas line.
Route the Millivolt wire through the opposite
side from the gas line.
When rigid pipe is used, an ANSI approved
manual shut-off valve and union must be
installed upstream of the fireplace.
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
controls 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
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