Lennox Hearth SHGL-18MP-R - Manual (Page 6)

NOTE: DIAGRAMS & ILLUSTRATION NOT TO SCALE. 6
Gas Pressure Check
The appliance regulator controls the burner
pressure which should be checked at the pres-
sure test point (
¹⁄₈" NPT plugged tap) located on
the manual control valve body (on Manual
models) or on the control valve itself (on Milli-
volt models), identified OUT for the manifold
side and IN for inlet pressure (
see Figure 8 ).
Ensure operating pressures are within the lim-
its specified in the technical chart on page 10.
The pressure should be checked with the gas
appliance burning and the control set to high.
Step 2. Connecting Gas Line – A qualified gas
appliance installer must connect the dual-listed
gas appliance to the gas supply.
Consult all local codes.
Route gas line using techniques and materials
prescribed by local and/or national codes. Only
use pipe of
¹⁄₂" or greater diameter to allow full
gas volume to the gas fireplace. Undue pres-
sure loss will occur if the pipe is too small.
An ANSI approved manual shut-off valve and
union must be installed upstream of the appliance
within the fireplace cavity when rigid pipe is used.
IMPORTANT: HOLD APPLIANCE REGULATOR
WITH A WRENCH TO PREVENT MOVEMENT
WHEN CONNECTING TO INLET PIPING
An external regulator must be used on all
propane (L.P.G.) appliances, in addition to the
regulator fitted to the appliance, to reduce the
supply tank pressure to 13" w.c. (maximum).
WARNING: CONNECTING DIRECTLY TO
AN UNREGULATED PROPANE TANK MAY
CAUSE AN EXPLOSION.
The appliance gas inlet connection is ³⁄₈" NPT
at the regulator/valve, located on the left side
facing the appliance. If a right side connection
is required, the connection pipe may be piped
under the rear of the appliance to end at the left
hand side for connection to the inlet.
When tightening up the joint to the regulator
hold the regulator securely with a wrench to
prevent the regulator from moving.
Checking Gas Connections
Secure all joints tightly using appropriate
tools and sealing compounds (ensure pro-
pane resistant compounds are used in
propane applications).
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 (50% dish
soap, 50% water) is an effective 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.
Never use an open flame to check for leaks.
A. Light the appliance (refer to the lighting
instructions label in the control compartment
or in the Homeowner's Care and Operation
Instructions).
Inlet Pressure Manifold Pressure
Millivolt Valve
Manifold Pressure
Manual Valve
Figure 8
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 to the “OFF” posi-
tion. Either tighten or refasten the leaking
connection and retest as described above.
C. When the gas lines are tested and leak free,
be sure to rinse off the leak testing solution.
D. When the gas lines are tested and leak free,
observe the individual tongues of flame on the
burner. Make sure all ports are open and
producing flame evenly across the burner. If
any ports are blocked, or partially blocked,
clean out the ports.
INSTALLATION
WARNING: DO NOT ALLOW FANS TO
BLOW DIRECTLY INTO THE FIREPLACE.
AVOID ANY DRAFTS THAT ALTER
BURNER FLAME PATTERNS.
WARNING: DO NOT USE A BLOWER IN-
SERT, HEAT EXCHANGER INSERT OR
OTHER ACCESSORY NOT APPROVED
FOR USE WITH THIS APPLIANCE.
This appliance must not be operated without a
fireplace screen installed. Fireplace screens
must not impair the free flow of combustion air
to the appliance.
Do not burn solid fuels in any fireplace equipped
with this Dual-Listed gas appliance.
WARNING: INSTALLED DECORATIVE
GLASS DOOR ENCLOSURES MUST BE
FULLY OPENED WHEN OPERATING THIS
DUAL-LISTED GAS APPLIANCE.
Any outside air ducts and/or ash dumps that
are part of the original solid fuel burning fire-
place system must be fully closed and sealed at
the time of installation of this Dual-Listed gas
appliance.
WARNING: SPECIAL CARE IS REQUIRED
IF YOU ARE INSTALLING THE UNIT INTO
A SUNKEN FIREPLACE. YOU MUST RAISE
THE FIREPLACE FLOOR TO ALLOW AC-
CESS TO GAS LOG CONTROLS. THIS WILL
INSURE ADEQUATE AIR FLOW AND
GUARD AGAINST SOOTING. RAISE THE
FIREPLACE FLOOR USING NONCOMBUS-
TIBLE MATERIALS.
A qualified gas appliance installer must install
this appliance.
Check gas type: The gas supply must be the
same as stated on the appliance’s rating
plate. If the gas supply is different, DO NOT
INSTALL the appliance. Contact your dealer
for the correct model.
Step 1. Placement of Appliance – Center the
appliance in the fireplace or firebox. Make
certain the grate front feet sit inside the front
edge of the fireplace or firebox, and that there
is adequate clearance around the appliance for
access and operation.