Lennox MPB3328CNM-B Installation Instructions Manual page 15

Merit plus series mpb b-vent gas fireplaces
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Gas
Valve
3/8" Nipple
3/8" Union
3/8" Close
Nipple
Gas Solid Line Connector
Figure 20 -
GAS CONNECTION
Using pipe-dressing materials appropriate for
the gas type, securely affix the shut-off valve
to this determined pipe length at a convenient
location outside of the appliance lower control
compartment.
TEST ALL CONNECTIONS FOR GAS LEAKS
(FACTORY ANd FIELd):
WARNING
Never use an open flame to
check for leaks.
Turn on gas supply and test for gas leaks us-
ing Turn on gas supply and test for gas leaks,
using a gas leak test solution (also referred to
as bubble leak solution).
Note: Using a soapy water solution is an effec-
tive leak test solution but it is not recommended,
because the soap residue that is left on the pipes/
fittings can result in corrosion over time.
A. Light the appliance (refer to the lighting
instructions label in the control compartment
or in the Care and Operation Instructions
manual).
b. Brush all joints and connections with the gas
leak test solution to check for leaks. If bubbles
are formed, or gas odor is detected, turn the
gas control knob (off/pilot/on) to the "OFF"
position. Either tighten or refasten the leaking
connection, then retest as described above.
C. When the gas lines are tested and leak free, be
sure to rinse off the leak testing solution.
Step 7. OUTSIdE AIR KITS
Optional outside make-up air kits, Model FOAK-
4 or FAOK-4LD (see Figure 22 on Page 16),
may be used with these appliances. Refer to
the installation instructions packaged with the
air kits for specific installation information.
If used, the outside air kit must be installed
before the fireplace is framed and enclosed in
the finished wall.
Gas Flex Line Connector
3/8" NPT x
1/2" x 3/8" Flare
Flare Fitting
Shut-off Valve
3/8" Flex Tubing
Gas
1/2" x 3/8"
Stub
Reducer
3/8" Shut-off Valve
Outside air drawn into the fireplace supplies
air to the fire for combustion. Only one outside
air duct is necessary, if installed. See Figure
3 on Page 5 and Figure 22 on Page 16 for the
location of the unit's outside air inlet.
If additional length of duct is necessary, pur-
chase locally available U.L. Class 0 or Class 1
metallic ducting. The duct may extend up to 50'
(15.24 m) in any direction.
Note: When installing the air duct vertically, DO
NOT terminate the duct closer than 3' below
the chimney top.
Outside combustion air ducting may be run
upwards or vertically through framing and ceil-
ing joists, with the hood installed through an
outside wall and 3' (1 m) below the termination.
Ducting may also be run downward through
floor joists and under the home to a ventilated
crawlspace not considered part of the living
area of the home.
Note: Do not terminate outside air kit in attic
space under any circumstances.
Never locate inlet where it can be
blocked by shrubs, snow drifts,
etc. Never locate inlet in garage
or any area where there is another
fuel burning appliance or products
emitting combustible gases such
as paint, gasoline, etc. In cold
climates, it is recommended the
outside air duct be insulated.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Note: The gas supply line
must be installed in accor-
dance with building codes
by a qualified installer
approved and/or licensed
as required by the locality.
In the Commonwealth of
Massachusetts, installa-
tion must be performed
by a licensed plumber or
gas fitter.
3"
Min
*Sediment
Trap
CAUTION
After completing the installation of the optional
outside air vent system the outside air control
lever must be put in service and tested to en-
sure proper operation before completing any
enclosure around the firebox. Failure to do
so may result in extensive and costly rework.
Before the operation of the vent system can
be tested, the lever securing screw must be
removed. See Figure 21.
The hand operated outside air control lever is
located on the left side of the fireplace opening.
See Figure 21.
To open the outside air shutter, open the bot-
tom control access panel, reach into the control
compartment, and pull the outside air control
lever all the way out. The outside air shutter
should be fully open when the fireplace is in use
and completely closed when the fireplace is not
being used. Closing it when not in use will prevent
outside cold air from entering the dwelling.
Outside Air Control Lever
Outside Air Control Lever
Securing screw
Air Shutter in Closed position
Outside Air Control Lever
Outside Air Control Lever
Securing Screw Removed
Air Shutter in Open position
Outside Air Control Lever
and Securing Screw Location
on Left Side of Cabinet in Lower Control
Compartment Area
Figure 21
Operate the actuator through several cycles
including the closed position. Ensuring proper
operation and freedom of movement. Return
the actuator arm to the closed position.
15

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