Armstrong AC Manuals from 1976
I am attaching here two pdf files of manuals for the mid-seventies Armstrong air conditioner:
1) Armstrong Travel Trailer Air Conditioner Owner's Maintenance Guide: Models TR25-12, TR25-14, TRH25-12, and TRH25-14
2) Installation Instructions: Armstrong Models TR25-12, TR25-14, TRH25-12, and TRH25-14
I hope these are helpful. Some members have asked about them. They have served me well. I should add that, as a precaution, I visited the local W.W. Grainger outlet and they did, indeed, have a motor that would replace mine if needed. Only $200. I had taken mine to a local motor shop and they said it was in top shape, windings and brushes were fine, it only needed a little oil.