LG AR-DR12-05A Installation And Operation Manual page 81

INDIRECT GAS FIRED FURNACES
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.
Figure 42: Typical Gas Supply Piping Connection
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.
Due to our policy of continuous product innovation, some specifications may change without notification.
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