decreased fan motor amperage

[icedr024]

On my air handler, will i get lower than normal amperage readings, if my return air damper shuts or will the motor struggle trying to pull air back causing higher amperage.

[mrhvacmechanic]

If it's a centrifical fan, the less air you move the lower the amperage.

[Octopus]

Put your amp meter on motor and remove cover, but yeah most of the time the amps will drop

[icedr024]

yah thanks for the info

[timebuilder]

On my air handler, will i get lower than normal amperage readings, if my return air damper shuts or will the motor struggle trying to pull air back causing higher amperage.

When you block off the return air (the damper closes) you are "starving" a typical blower -type fan for air. Less air is available, less work is being done, lower amps will flow to do that lesser amount of work.