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Category: Furnace

Furnace

Lennox Pulse Furnace Troubleshooting

Posted on January 4, 2011March 12, 2019 by admin

Troubleshooting procedures for the Lennox Pulse furnaces are shown in Fig. 2-20. Figure 2-21 shows the circuitry for the G-14Q series of furnaces. Note the…

Furnace

High-Efficiency Furnaces Combustion Process

Posted on January 4, 2011March 12, 2019 by admin

The process of pulse combustion begins as gas and air are introduced into the sealed combustion chamber with the spark plug igniter. Spark from the…

Furnace

High-Efficiency Furnaces Sequence of Operation

Posted on January 4, 2011March 12, 2019 by admin

On a demand for heat, the room thermostat initiates the purge blower operation for a prepurge cycle of 34 s, followed by energizing of the…

Furnace

High-Efficiency Furnaces Electrical Controls

Posted on January 4, 2011March 12, 2019 by admin

The furnace is equipped with a standard-type redundant gas valve in series with a gas expansion tank, gas intake flapper valve, and air intake flapper…

Furnace

High-Efficiency Furnaces Operation

Posted on January 4, 2011March 12, 2019 by admin

The high-efficiency furnaces achieve that level of fuel conversion by using a unique heat-exchanger design. It features a finned cast-iron combustion chamber, temperature-resistant steel tailpipe,…

Furnace

High-Efficiency Furnaces

Posted on January 4, 2011March 12, 2019 by admin

Furnaces have been designed (since 1981) with efficiencies of up to 97 percent, as compared to older types with efficiencies in the 60 percent range.…

Furnace

Hot Air Furnace Circuit Board Control Center

Posted on January 4, 2011March 12, 2019 by admin

Newer hot-air furnaces feature printed circuit control. The board shown in Fig. 2-8 is such that it is easy for the technician installing the furnace…

Furnace

Hot Air Furnace Thermostat Location

Posted on January 3, 2011March 12, 2019 by admin

The room thermostat should be located where it will be in the natural circulating path of room air. Avoid locations where the thermostat is exposed…

Furnace

Hot Air Furnace Low-Voltage Wiring

Posted on January 3, 2011March 12, 2019 by admin

Make the field low-voltage connections at the low-voltage terminal strip shown in Fig. 2-7. Set the thermostat heat anticipator at 0.60 A (or whatever is…

Furnace

Hot Air Furnace Field Wiring

Posted on January 3, 2011March 12, 2019 by admin

The installation of a new furnace requires you to follow a factory diagram furnished in a booklet that accompanies the unit. The wiring to be…

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