LG AR-DE12-05A Installation And Operation Manual Download

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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.

NOTE

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.

NOTE

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.

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.

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.

Type of Gas

Typical

Furnace

Data Label

each unit will be

different

Minimum

Gas
Supply
Pressure

Ground

Gas to