What should the fan speed be on a HVAC system?
In HVAC fan speed, select the fan speed you’d like to use when your system is heating or cooling your home. You can choose Low, Medium, High or Auto, depending on your system’s wiring. Your fan will always run at that speed when heating or cooling your home.
Is the a / C fan a 4 speed fan?
When you have selected on the slider control MAX A/C the relay you’re talking about in the engine compartment takes over and the fan will only run on the high speed. When you select NORM A/C on the slider control you will have control over the fan speed. Our fans are actually considered a 4 speed fan.
Can a fan speed be controlled by a thermostat?
Fan speed typically can’t be controlled by a thermostat. Important: Consult a trained HVAC professional before making any changes to your system fan speed as it could have unintended consequences. This affects the fan speed when your system is actively heating and cooling.
How do you set the fan speed on an air handler?
Inside the air handler, usually on a control board (a printed circuit board) there will be one or more switches or little jumpers that the service technician can set to control the fan speed or speeds on the particular air handler. It’s usually a switch or jumper change, or occasionally on older air handlers, moving a wire from one pin to another.
When you have selected on the slider control MAX A/C the relay you’re talking about in the engine compartment takes over and the fan will only run on the high speed. When you select NORM A/C on the slider control you will have control over the fan speed. Our fans are actually considered a 4 speed fan.
When to use higher fan speed in cooling mode?
In general, higher air handler unit (AHU) speeds when running in cooling mode will give quicker cool-down of the occupied space and are suitable during daylight hours when the cooling load will be highest. Higher fan speeds may actdually be more energy-efficient as well.
Why does my AC fan not work at high speeds?
On the low speeds, the fan relay routes the voltage thru the resistor block. When you switch to high fan speed, the relay switches over to supply full voltage from the battery to the fan motor. Tester is right.
What’s the fan speed on an air handler?
Common air handler fan speeds might be labeled on the circuit board as simply A B C that enables you to move a jumper to connect pairs of pins at each of those locations to select the given fan speed or fan feature.