Coleman-Mack 13.5 Mach III Power Saver

[Staley]

I decided to upgrade our RV AC units before our summer trip. The original front 13.5 unit has been kind-of flaky (meaning sometimes it cools excellent and sometimes not)

I researched and purchased a new Mach I 11k PS for the rear and the 13.5 Mach III PS for the front. I chose the power saver models because.. well they draw approx 4A less per unit!!

Yesterday I installed the new front unit and have noticed several things. It does not seem to have the volume of air CFM as the original and the vent temp is 54F at best. The original unit (when it was working) seemed to have better CFM and cooled at 48F. I am aware that the new compressors are R410a vs R22. I have not changed the rear unit yet and it kicks out 48degF with a rather noisy compressor.

Thoughts..Ideas?

Mike

[Staley]

To answer my own question, I did some research today.

I called RVProducts technical help and talked with them regarding the regular vs. power saver units, the differences between them, and the difference between the older R22 and new R410a units. They told me lots of information regarding the compressors and basically.. the regular efficiency new R410a unit takes 20-30 minutes of operation to reach peak efficiency with a 16-22 def F drop across the coil and the power saver unit will take 30-40 before it has reached its peak with the same temperature drop. The CFM has remained the same at approx 320.

The older R22 units will reach peak efficiency lots faster.. so that is the reason for the temperature difference that I saw yesterday and the colder air just felt like it had more volume because it was colder.

I installed the Mach I PS unit today and turned them both on at the same time and let them rip. With dual SnapOn digital temperature gauges I measured 20-22 across the coil after about 40 minutes and the longer I let them run the colder the discharge temperature got.

The Mach I uses 9.8A running as measured with my amp probe
The Mach III uses 10.5A

Very happy!!

Mike