14
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Gas Line Installation
After leveling, position the insert in the fireplace holding it about six
inches out from its final location.
CAUTION: Specific hearth requirements apply (see Clearances
to Combustibles).
This appliance must be connected to the gas line in accordance with local
codes and/or the National Fuel Gas Code, ANSI Z223.1 (In Canada, the
current CAN/CSA B149.1 installation code). This appliance comes with
an 8" nipple attached to the supply side of the gas valve. After connect
ing the gas line, all joints in the line and connections at the valve should
be checked for leaks before final positioning of the unit. Conduct a gas
leakage test of the appliance piping and control system downstream of
the shutoff valve in the supply line to the appliance.
Gas Pressure Requirements
A MAJOR CAUSE OF OPERATING PROBLEMS WITH GAS
APPLIANCES IS IMPROPER GAS PRESSURE!
The most important item to check during the initial installation
and the first thing to check when operating problems occur is
gas pressure! This appliance will not function properly unless
the required gas pressure is supplied. See the table on this
page for gas pressure requirements.
Two pressure taps are provided on the appliance's valve to check gas
pressures. The taps are located to the right of the on/off/pilot knob (see
Figure 14
). The bottom tap is the inlet (supply) pressure side. To check inlet
pressure (with the appliance burning), insert a small phillips screwdriver
into the tap and turn a half turn counterclockwise. Cover the tap with the
line from a manometer and check the pressure. Close the tap gently but
securely after completing the check. The manifold (outlet) tap is above
the inlet tap. To check manifold pressure (with the appliance burning
at the high burn setting) insert a small phillips screwdriver into the tap
and turn a half turn counterclockwise. Cover the tap with the line from
the manometer and check the pressure. Again, close the tap gently but
securely after completing the check. Check the taps for gas leaks with a
gas leak test solution (retighten if necessary).
If the pressure is not sufficient, make sure the gas supply line is large
enough, the supply regulator is properly adjusted and the total gas load
for the residence does not exceed the amount supplied.
Propane tanks are at pressures that will cause damage to valve com
ponents. Verify that the tanks have step down regulators to reduce the
pressure to safe levels.
LP and Natural Gas Supplies
Your gas appliance is equipped from the factory for use with natural gas
only as specified on the Safety / Listing label attached to the appliance.
This appliance can only be operated using propane gas (LP) if a certified
fuel conversion kit provided by Lennox Hearth Products is installed by a
qualified service technician.
Also check the orifice size on the label on the igniter bracket. It must be
the correct size for the fuel and altitude.
Do not run propane tank dry. Running the tank dry may cause
a hazardous condition due to pressure drop in empty tank.
Solid fuel is NOT to be used with this unit.
Air Shutter Adjustment
Your gas appliance has an air shutter control lever located behind the
lower door on the insert's face and to the left of the gas valve (see
Figures 15a and 15b
). The lever is linked to the primary air shutter on
the main burner. The air shutter regulates the amount of primary air the
burner receives and therefore how clean the insert burns. The air shutter
should only be adjusted by a qualified gas technician. The insert should
burn for about 15 minutes with the logs installed before adjusting the air
shutter. More air will result in shorter flames and less color, less air will
result in bigger flames and more color. To adjust the air shutter, insert
a regular screwdriver into the slide adjustment and slide it side to side
(see
Figures 15a and 15b
).
CAUTION: The air shutter should never be set so as to make the
tips of the flames sooty or create sooting on the viewing glass,
logs, or heat exchanger. If soot begins to form after burning,
the air shutter should be opened gradually until the sooting
condition stops. Gas quality and gas pressure may vary, which
can affect the burning characteristics of the insert.
Fuel
Type
Inlet Pressure
Manifold Pressure
Desired Minimum Maximum
On Hi
Fire
On Lo
Fire
Natural
Gas
7" WC
5" WC
10.5" WC
3.5" WC 1.7" WC
LP Gas
11" WC 10.5" WC
13" WC
10" WC
5.4” WC
Robertshaw Millivolt Gas Valve
TP/TH
TH
TP
Inlet (Supply)
Pressure Tap
Figure 14
The Manifold
(Outlet) Tap
The appliance must be isolated from the gas supply piping system
by closing its equipment shutoff valve during any pressure testing of
the gas supply piping system at test pressures
equal to or less than
1/2 psig (3.5 kPa).
The appliance and its appliance main gas valve must be disconnected
from the gas supply piping system during any pressure testing of that
system at test pressures
in excess of
1/2 psig (3.5 kPa).
