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#Airflow systems blue air handler how to#
#Airflow systems blue air handler manuals#

You've got the manual, right? If not we give a link below for finding manuals for most HVAC equipment. Watch out: do not even touch wires or the control board if you are not trained in safe electrical work as you could be shocked or killed.īe sure to see the wiring diagram on the fan motor and/or on or in the air handler unit itself as well as in the manual.

Typical fan wire colors in an air handler or at the blower motor will be (not all of these are always present):Īn ohmmeter checking between common (white) and other wires can compare circuit resistance: highest resistance = lowest speed.

Changing a fan speed (ON AUTO OFF HI LO) provided on some room thermostats.

Changing a dip switch or small slider switch position provided on some air handler control boards.

Changing jumper positions on the control board (printed circuit board shown below) in the air handler.

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.

The remote control for a wall-mounted split system air conditioner or heat pump.

Blower Fan Speed Adjustment Optionsįan speeds provided inside the air handler unit may be set or adjusted by The result is a more-quiet cooling system operation. (Khattar un-dated).Ĭonversely we use a lower fan speed during cooling season to increase the dehumidification or moisture removal in the building, and for night-time operation when the cooling load is reduced. Higher fan speeds may actdually be more energy-efficient as well. 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 air speeds are needed during the cooling season than during the heating season.

There is no single "right" fan speed for all heating and cooling conditions and both high and low speed settings have uses and advantages.Īt RETURN AIR, INCREASE we explained that in general, This article describes using jumpers or switch settings or independent controls to adjust the blower fan speed in air handlers used in heating and cooling systems. Air Handling Unit Blower Fan Speed Adjustment We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Indoor components of air conditioners and heat pumps: the air conditioning system indoor air handler units, blower units, or AHU's, (also called fan coil units) including the air conditioner blower fan, the indoor cooling coil or "evaporator coil", airĬonditioning system filters, and the causes, cures, and prevention of air handler leaks that lead to rust, damage, and mold contamination in the

#Airflow systems blue air handler how to#

This article series explains how to inspect & repair the How is the blower fan or air handler fan speed controlled in heating and air conditioning air handler equipment or split systems air AHUs? How to set the fan speed in your heating or air conditioner air handler unit or "blower unit". We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.