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Old 06-03-2020, 12:24 PM   #1
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Coleman Mach AC - Cool Hi vs. Cool Lo

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.
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Old 06-03-2020, 12:49 PM   #2
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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
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Old 06-03-2020, 04:27 PM   #3
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Quote:
Originally Posted by LeisurePursuits View Post
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 canít either, on hot camping I use high fan not auto because unit doesnít have to catch up from it shutting off on auto it keeps the air moving.
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Old 06-04-2020, 11:36 AM   #4
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I canít either, on hot camping I use high fan not auto because unit doesnít 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.
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Old 06-04-2020, 01:51 PM   #5
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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.
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Old 06-04-2020, 03:12 PM   #6
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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.
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