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LeisurePursuits · 06-03-2020, 12:24 PM

Here's one thing that has always bothered me. On our digital thermostat for the Coleman Mach 15k btu AC there are Cool Hi and Cool Lo modes, but I'll be darned if I can tell a difference. Is there one? The fan sounds the same.

Old-Biscuit · 06-03-2020, 12:49 PM

There really IS some difference....fan speed changes Hi to LO and on LO 'slight' change in airflow
LO fan can cause icing on Evap Coil due to lower airflow and does little to actually move enough cool air to maintain temps thruout RV

Only Hi Speed Airflow ratings are published.....320 CFM
Nothing about Lo Speed Airflow or motor rpm

I always use HI for MAX cooling/airflow
When I replaced the old analog T-stat with a Digital one I didn't bother wiring up LO Speed

Tha_Rooster · 06-03-2020, 04:27 PM

Quote:

Originally Posted by LeisurePursuits

Here's one thing that has always bothered me. On our digital thermostat for the Coleman Mach 15k btu AC there are Cool Hi and Cool Lo modes, but I'll be darned if I can tell a difference. Is there one? The fan sounds the same.

I can’t either, on hot camping I use high fan not auto because unit doesn’t have to catch up from it shutting off on auto it keeps the air moving.

LeisurePursuits · 06-04-2020, 11:36 AM

Quote:

Originally Posted by Tha_Rooster

I can’t either, on hot camping I use high fan not auto because unit doesn’t have to catch up from it shutting off on auto it keeps the air moving.

Hmmm. I don't have "auto". My fan always runs. I often wish the fan would shut off after the set temp is reached.

astrocamper · 06-04-2020, 01:51 PM

I run my Coleman-Mach 1 PowerSaver on "Cool Low Auto". The fan turns off slightly after the compressor when at the desired temperature and doesn't blow constantly.

This is the most efficient way to run the air conditioner off my solar powered batteries.

LeisurePursuits · 06-04-2020, 03:12 PM

Quote:

Originally Posted by astrocamper

I run my Coleman-Mach 1 PowerSaver on "Cool Low Auto". The fan turns off slightly after the compressor when at the desired temperature and doesn't blow constantly.

This is the most efficient way to run the air conditioner off my solar powered batteries.

Doh! I never noticed Cool Lo Auto. I like it. I need to wear my glasses more often, I guess.