Lennox Hearth ELITE VISN-25/35 - Manuel (Page 18)

18
Gas Line Installation
This stove 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). The gas line screws into the
gas valve at the back of the stove 2­1/2” in from the left side of the stove
and 8­1/2” up from the base of the unit. After connecting the gas line, all
joints in the line and connections at the valve should be checked for leaks.
After connecting 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. To access the taps, remove the two socket head screws from
the valve control panel. The taps are located below the on/off/pilot knob.
The left tap is the inlet (supply) pressure side. To check inlet pressure
(with the appliance burning) insert a small flat­bladed screwdriver into
the tap and turn a half­turn counterclockwise. Cover the tap with the
line from the manometer and check the pressure. Close the tap gently
but securely after completing the check. The manifold (outlet) tap is to
the right of the inlet tap. To check manifold pressure (with the appliance
burning at the high burn setting) insert a small flat­bladed screwdriver
into the tap and turn a half­turn 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 improperly adjusted and the total gas load
for the residence does not exceed the amount supplied.
LP and Natural Gas Supplies
This 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.
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 1.8" WC
LP Gas 11" WC 11" WC 13" WC 10" WC 6.0” WC
SIT Millivolt Gas Valve
Gas Control Knob
(Pilot / On / Off)
Flame Height Control
Knob (HI/LO)
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).