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Old 09-28-2013, 09:16 AM   #1
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Heat/ac running at same time

We are on our first trip with our new Heritage Glen 28RLT. It got a little cool so I put the heat on last night. The overhead Ac unit came on too. Both the furnace and the overhead unit were running although it was not blowing cold air. This is new to me so I don't know if it is supposed to run to circulate air but it does not make sense to me. Maybe something dumb but it doesn't seem right. Any suggestions?

Jim
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Old 09-28-2013, 09:20 AM   #2
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If you have a Dometic digital thermostat, make sure it is on "auto" instead of low or high speeds......
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Old 09-28-2013, 09:33 AM   #3
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This is the thermostats I have. In this position both units are running
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Old 09-28-2013, 09:36 AM   #4
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X2. If you have a Dometic digital thermostat push the On/Off/Mode button to get to 'Fan'. Using the + or - buttons cycle thru them until you see "Au' in the readout.
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Old 09-28-2013, 09:38 AM   #5
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No picture. It is a Dometic. Has three positions Fan, Cool, And Furnace. Plus an on/off mode.
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Old 09-28-2013, 09:45 AM   #6
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Ok got it to Au. Just leave it there? How do I set temp?
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Old 09-28-2013, 09:48 AM   #7
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Quote:
Originally Posted by Jim 1367 View Post
Ok got it to Au. Just leave it there? How do I set temp?
After setting to the AU position, you use the "+ or -" keys to set the temp.
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Old 09-28-2013, 09:59 AM   #8
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Ok , I am not as dumb as I seem really. If I leave I leave it where it is the on off light is on it goes off after 30 seconds and there is nothing in the display. I assume it is because it is not calling for heat or ac?
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Old 09-28-2013, 10:04 AM   #9
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After setting fan to Au, use on-off switch to move to heat (or cool as the case may be) and select temp using + - keys. When heat is called for, furnace blower will start and AC will not.

When in cool mode, Au will cause fan to turn on and off with need for cooling. Other modes of fan (hi or lo) will cause fan to run constantly when cool mode is selected and only AC compressor will cycle on and off as needed. If the neighbors are making too much noise at night, set fan to lo and thermostat to cool. Instant "white noise" generator to mask the sounds outside.
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Old 09-28-2013, 10:11 AM   #10
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Ok, think I got. Thanks for all the help. This forum is great.( I am still waiting on call back from dealer)

Jim
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