Step 6. Outside Air Kit Installation - Lennox MPB35ST-NM-B Installation Instructions Manual

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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 effective leak test solution
but it is not recommended, because the soap
Gas
Valve
3/8" Nipple
3/8" Union
3/8" Close
Nipple
Figure 19 -
GAS CONNECTION
CONTROL COMPARTMENT ACCESS INSTRUCTIONS (
Opening Control Compartment Door: Gently depress the outer top corners of the louvered Control
Compartment Access Panel until the spring-loaded magnetic catches "pop" it free, allowing it to
swing out and down to open.
Removing Control Compartment Door: With the panel in the open position, depress the spring-
loaded hinge pin on left side until it disengages from the left cabinet panel hole. Pull panel away
from fireplace.
Hinge Pin
14
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.
Gas Flex Line Connector
3/8" NPT x
1/2" x 3/8" Flare
Flare Fitting
Shut-off Valve
3/8" Flex Tubing
1/2" x 3/8"
Reducer
3/8" Shut-off Valve
Gas Solid Line Connector
OFF/PILOT/ON (gas control knob)
HI/LO (flame height
control knob)
OFF/ON Switch
Latch for
Glass Door
Control Compartment
Access panel
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
Gas
as required by the locality.
Stub
In the Commonwealth of
Massachusetts, installa-
tion must be performed
by a licensed plumber or
gas fitter.
3"
Min
*Sediment
Trap
)
Ref. Figure 20
Gas Flex Line
(with shut-off valve)
Gas Valve
Piezo Igniter
Figure 20
Step 6. OUTSIDE AIR KITS
Optional outside make-up air kits, Model
FOAK-4 or FAOK-4LD (see Figure 22 on Page
15), 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.
Outside air drawn into the fireplace supplies air
to the fire for combustion. Only one outside air
duct is necessary, if installed. See Figure 9, Page
9 for the location of the units 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 feet
below the chimney top.
Outside combustion air ducting may be run
upwards or vertically through framing and
ceiling joists, with the hood installed through
an outside wall and 3 feet (1 m) below the ter-
mination. 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.
CAUTION
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.
After completing the installation of the optional
outside air vent system, the outside air control
lever must be put in service and tested to
ensure 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 on Page 15.
The hand operated outside air control lever
is located on the right side of the fireplace
opening. See Figure 21.
To open the outside air , open the bottom control
access panel, reach into the gap between the
firebox bottom and pull the outside air control
lever all the way out.

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