Some Installation Recommendations
New furnaces for residential installations are shipped preassembled from the factory with all internal wiring completed. In order to install the new furnace, the gas piping from the supply main, the electrical service from the line voltage main, and the low-voltage thermostat must be connected. Directions for making these connections are to be found in the furnace manufacturer’s installation instructions.
Caution
A gas furnace must be properly set up and installed by a certified gas heat technician, a representative of the gas furnace manufacturer, or an HVAC professional with equiva- lent experience.
Make certain you have familiarized yourself with all local codes and regulations that govern the installation of a gas-fired furnace. Local codes and regulations take precedence over national stan- dards. Your furnace installation must comply with the local codes and regulations.
Always check a new furnace for damages as soon as it arrives from the factory. If shipping damages are found, the carrier (not the factory) should be notified and a claim filed immediately. Heating equipment is shipped FOB from the factory and it is the responsibility of the carrier to see that it arrives undamaged.
Always place the furnace on a solid and level base. Doing so will reduce vibrations from the equipment and keep operating noise to a minimum. In a crawl-space installation, the furnace is either sup- ported on a slab or on concrete blocks, or it is suspended from floor joists with 3⁄8-in hanger rods.
A furnace installed in an attic should be placed on a fiberboard sheeting base to absorb vibrations. Many furnaces designed for attic installations are certified for installation directly on combustible material such as ceiling joists or attic floors. In an attic installation, the furnace should be placed over a load-bearing partition for additional support.