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Old 05-26-2012, 11:35 AM   #1
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dometic air model 457915.7100

We have a 2012 george town 378 with model 457915.7100 air.It has a 3 speed blower.Ours seems to blow at same speed on auto- low and high.When the heat comes on the fan blows at a slower speed.Because of fan noise in bed room has any one change so low on the wall control would run the fan at low speed.Did not get manuals for air when we got coach.Wire schematic on air conditioner but hard to see .
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Old 05-26-2012, 10:39 PM   #2
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How do you know it is a 3 speed blower if you don't have AC manual?
What type of thermostat controller do you have?
I have the same rig and I thought I had a low and high fan setting for AC
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Old 05-26-2012, 11:11 PM   #3
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yes thats a goofy thermostat. We have the same on ours. Press the bottom mode button and cycle to the fan once lit press the up button until you see either Auto, Lo, Hi.... Then press mode again until cool or heat is lit. That will select your fan speed for either one.

Not sure if this makes since....

Daniel
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Old 05-27-2012, 05:05 PM   #4
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You can try to locate your user and installation manuals here on the dometic site

Operation & Installation Manuals - Dometic
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Old 05-27-2012, 05:50 PM   #5
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I could not find on dometic site.Did find on internet that it was 3 speed.Turn on heat and fan will run at low speed.May be that you need more air flow to run air conditioner.
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Old 07-08-2012, 12:50 PM   #6
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Quote:
Originally Posted by manvel View Post
I could not find on dometic site.Did find on internet that it was 3 speed.Turn on heat and fan will run at low speed.May be that you need more air flow to run air conditioner.
On my 2012 378 the thermostat works as follows. keep the fan speed on AU and the unit will shut off when the set temp. is reached. It also will change fan speed as needed while cooling on AU. If you keep Low or HI the fan will run until you manually shut the unit off. There is no 3rd speed that i know of.....
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