LG AR-DR12-05A Installation And Operation Manual page 80

INDIRECT GAS FIRED FURNACES
Control Wiring Installation
Disconnect power supply before making any wiring connections to prevent electrical shock and equipment damage.
All appliances must be wired strictly in accordance with the wiring diagram furnished with the unit. Any wiring different from the diagram
could result in a hazard to persons and property.
Any original factory wiring that requires replacement must be replaced with wiring material having a temperature rating of at least 105° C.
1. Installation of wiring must conform with local building codes. In the absence of local building codes, installation must conform to the
National Electrical Code and ANSI/NFPA 70 - Latest Edition. Unit must be electrically grounded in conformance with this code. In Canada,
wiring must comply with CSA C22.1, Canadian Electrical Code.
2. All furnaces are provided with a wiring diagram located on the inside of the access panel or door to the unit's furnace. Refer to this dia-
gram for all wiring connections.
Discharge Air Sensor Installation
Every furnace has a Discharge Air Sensor included. It is typically attached to the terminal strip on the furnace control center. If the ventilating
unit has a microprocessor controller, the discharge air sensor will be connected to the microprocessor controller. See the unit-specific wiring
diagram. Install sensor in the supply air duct, as far downstream as possible for accurate temperature measurement. Additional wire may be
added to the sensor as necessary.
Gas Piping Installation
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.
All piping should be clean and free of any foreign material. Foreign material entering the gas train can cause damage.
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
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.
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.
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.
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