Tags: Hot Air Furnace

Hot Air Furnace Circuit Board Control Center

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Hot Air Furnace Circuit Board Control Center

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 to hook it up properly for the first time. The markings are designed for making it easy to connect the furnace for accessories, if needed. Figures 2-9 and 2-10 show […]

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Hot Air Furnace Thermostat Location

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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 to cold-air infiltration, drafts from windows, doors, or other openings leading to the outside, or air currents from warm- or cold-air registers, or to exposure where the natural circulation of […]

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Hot Air Furnace Low-Voltage Wiring

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Hot Air Furnace Low-Voltage Wiring

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 called for by the manufacturer). If additional controls are connected in the thermostat circuit, their amperage draw must be added to this setting. Failure to make the setting will result […]

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Hot Air Furnace Field Wiring

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Hot Air Furnace Field Wiring

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 done in the field is represented by the dotted lines in Fig. 2-7. All electrical connections should be made in accordance with the National Electrical Code and any local codes […]

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Hot Air Furnace Manufacturer’s Diagrams

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Hot Air Furnace Manufacturer’s Diagrams

Figure 2-4 shows how the manufacturer represents the location of the various furnace devices. The solid lines indicate the line voltage to be installed. The dotted lines are the low voltage to be installed when the furnace is put into service. The motor is four speed. It has different colored leads to represent the speeds. […]

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Hot Air Furnace Ladder Diagrams

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Hot Air Furnace Ladder Diagrams

Electrical schematics are used to make it simple to trace the circuits of various devices. Some of these can appear complicated, but they are usually very simple when you start at the beginning and wind up at the end. The beginning is one side of the power line and the end is the other side […]

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