GFCI on Variable speed ac blower keeps tripping (new install).

[kdsolarpower]

The title says it all.
On the HVAC blower motor in my garage, I replaced the standard recep with new 20A GFCI (it's what I had on hand).
However, every time the blower ramps up, the GFCI trips. Never had an issue on this circuit before. The AC is about 3yr old (Rheem Prestige).
If I plug in the blower to a recep round the corner, works fine. Resistance at the blower feed (blower unplugged) between line and ground, and neutral and ground on the order of 2.4 Meg-Ohms. Resistance between line and neutral ~19 ohms. Amperage between blower ground and jbox ground, ~2.4mA.

This is only when it is calling for cold air. If I just turn on the blower (single speed) it works fine, no GFCI trip.

Any help or direction to the appropriate reading/other posts, would be greatly appreciated.

KD.

 

[ptonsparky]

GFCI and VFDs do not always play nicely together. See if you can find what the leakage current is for your unit.

Did the unit trip while you were checking mA?

 

[kdsolarpower]

Tom, thanks for the reply.
I will try to get leakage current from mfg. However, according to Rheem website "they don't provide technical support". I'm going to try
to get in touch with their engineering dept.

GFCI did not trip for blower operation, but did trip when I called for cooling (blower only uses single speed).

KD.