Well gang,
This is interesting. I like to learn all I can about these basement A/C units. Ours is an '04 Itasca Horizon 36GD with the 330 CAT. The basement A/C in it is the Colman Mach unit. They appear close to the same. Ours is making a tad bit more noise during both heat pump and A/C operations so, I'm thinking I must pull the unit and do an in depth inspection. A nice gent on another forum put out a "blow by blow" report with pictures on removal, repair and replacement. So, I watch this thread with eagerness.
Scott