What is EAC on furnace board?

EAC: Electronic Air Cleaners.

What color wire goes where on a thermostat?

This is the most typical thermostat wiring style, and it applies to systems that regulate both heat and air conditioning. The wires are typically arranged as follows: red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (although the common wire may be a different color).

What is the limit switch on a furnace?

A furnace limit switch is a component of a forced-air furnace that is responsible for turning on the furnace blower once the desired heat has been met inside the furnace. Without a functioning furnace limit switch, a furnace would not be able to regulate the temperature in conjunction with a thermostat.

What is the hum terminal on a furnace?

The HUM terminal on most furnaces is a 120VAC terminal. If you want to use the HUM terminal to control the humidifier, you’re going to have to use a step down transformer, to drop that down to 24VAC. To measure the voltage on the HUM terminal: Set your volt meter to measure AC volts.

What is EAC terminal?

EAC terminals are energized on every HVAC blower call. The homeowner can simply change the thermostat fan switch from the “Auto” position to the “On” position any time they feel additional humidification is required. AUTOMATIC CONTROL (ADHC) WITH EAC TERMINALS.

Where is the power switch on a furnace?

It’s usually mounted on the side of the furnace or a wall nearby. Among other benefits, this switch allows you or your plumber or repair technician to shut off the electricity to the furnace without having to go to the main service panel to switch off the circuit breaker.

What do the different color wires mean on a thermostat?

The wires are typically arranged as follows: red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (although the common wire may be a different color).