Installation Of Gas Piping; Test The System For Leaks; Gas Pressure Test Ports - LG GEN2 Series Installation And Operation Manual

Installation of Gas Piping

IMPORTANT
All gas piping must be installed in accordance with the
latest edition of the National Fuel Gas Code ANSI/
Z223.1 and any local codes that may apply. In Canada,
the equipment shall be installed in accordance with
the Installation Code for Gas Burning Appliances and
Equipment (CGA B149) and Provincial Regulations
for the class. Authorities having jurisdiction should be
consulted before installations are made.
IMPORTANT
All piping should be clean and free of any foreign
material. Foreign material entering the gas train can
cause damage.
WARNING
All components of this or any other gas fired heating
unit must be leak-tested prior to placing the unit into
operation. A soap and water solution should be used
to perform this test. NEVER test for gas leaks with an
open flame.
IMPORTANT
Do NOT connect the unit to gas types other than
what is specified and do NOT connect the unit to gas
pressures that are outside of the pressure range
shown on the label.
WARNING
When leak testing pressures equal to or less than
14 in. wg (3.5 kPa), first close the field-installed shutoff
valve to isolate the unit from the gas supply line.
WARNING
When leak testing pressures above 14 in. wg
(3.5 kPa), close the field-installed shutoff valve,
disconnect the furnace and its gas train from the gas
supply line and plug the supply line before testing.
When connecting the gas supply, the length of the
run must be considered in determining the pipe size
to avoid excessive pressure drop. Refer to a Gas
Engineer's Handbook for gas pipe capacities.
Each furnace has a single 3/4-inch connection.
Determine the Gas Supply Requirements
The data label located on the face of the furnace lists
the requirements for the gas being supplied to the unit.
Type of Gas
Data Label
NOTE
NOTE
each unit will be
different
Typical
Furnace
Connect the Supply Gas Line
A manual shut off valve, a 1/8 inch plugged test port and
a drip leg must be installed between the gas supply pipe
and the start of the gas train. The valve and test port
must be accessible for the connection of a test gauge.
Supply gas connections must be made by a qualified
installer and are not furnished by manufacturer.
From Gas Supply
Bleeder Valve or
1/8 in Plugged Tap
Typical Gas Supply Piping Connection
IMPORTANT
Before applying gas to the valves, test the gas
pressure to make sure it is less than 14 in. wg.
Pressures greater than 14 in. wg will damage the gas
valves.
Install Additional Regulator (if required)
If the gas supply pressure exceeds 14 in. wg, an
additional regulator must be installed to reduce the
pressure. The additional regulator is to be provided and
installed by others. The regulator must have a Listed
leak limiting device or it must be vented to the outdoors.

Test the System for Leaks

After installing the gas supply piping, perform a leak test
in accordance with the instructions in this manual. The
leak test must be performed before placing the unit in
service.

Gas Pressure Test Ports

Burner manifolds and gas valves used in the furnaces
are supplied with test ports for temporary connection of a
pressure gauge or a magnehelic gauge.
Minimum
Gas
Supply
Pressure
Ground
Gas to
Joint
Union
Manual Shut
Off Valve
8 in. Trap