Here we go again LOL!
Gisbon,
The 22 amp minimum circuit ampacity listed on the nameplate already has the 125% of compressor FLA and 100% of all other loads factored in. The manufacturer has already completed the calculation as per 440.32, it does not need to be repeated again in the field. Abode was just approximating the 17 amp FLA rating. 17.6 amps X 125% equals 22 amps.
If the nameplate states a minimum circuit ampacity of 22 amps, then thats what it is, 22 amps. Table 310.16 lists the ampacity of #12 wire at 25 amps in both the 60 and 75 degree columns. Article 240.4d does not limit the #12 wire to 20 amps for air conditioner loads as per 240.4g.
Yes, the NEC is a minimum standard, but minimum or not, #12 wire is legal for this air conditioner unless high ambient temperature and/or adjacent conductor factors apply. Although voltage drop compensation should be considered if it applies, it is not an NEC requirement, it is only a fine print note in article 210.19a.
[This message has been edited by Matt M (edited 01-29-2003).]