Carrier Furnace Blower Speed Adjustment

Your furnace shows that you have an ecm motor which is an electronically controlled motor.

Carrier furnace blower speed adjustment.

Step 1 turn off the power source that is connected to the furnace blower. There should be low voltage speed taps on the main board for speed adjustments in cooling and heating. Thermostat fan control on old furnace without circuit board. Current high efficiency furnaces can be rated up to 98 5 afue which can reduce utility costs over the life of the furnace.

Step 2 carefully disconnect the wires from the coolant terminal which is located on the back of the unit. Turn it off again for 1 3 seconds and back on. Consult your blower s owners manual to determine what your furnace blower s speed should be. Adjusting the fan speed for the furnace is not something to do just because you want it quieter or to save electricity.

That should bump the fan speed up one level doing so each time will increase one speed until it cycles back to low. Most of these are on the bottom left of the control board. The wires are several different colors. On most control boards there will be a jumper that is marked to show that it controls the speed.

Blower fan speed adjustment options fan speeds provided inside the air handler unit may be set or adjusted by the remote control for a wall mounted split system air conditioner or heat pump changing the fan wire connection between the fan on relay and the fan motor selecting a high medium or low speed right on the fan motor itself. Your furnace elements have a certain wattage. With no call for heat or cool turn your circulation fan to on. Low speed furnace fan blower motor will not shut off.

It will not change heating or cooling fan speeds. This only affects the fan in circulation mode. Every furnace must have an adjustable blower. Usually there will be three speeds ranging from 40 to 100 of airflow.

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