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Old 11-08-2015, 07:49 PM   #1
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Aqua hot system

I have a 450 DE system in my coach. I had to use it the other night and was wondering if 110 degrees output air at the register is normal output? Seems low to me but have been told that its acceptable.
Anybody have a handle on their unit output ?
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Old 11-08-2015, 09:28 PM   #2
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I also have a 450 DE system and all 5 heat registers read between 125 to 130 degrees . I have it serviced each year and just had mine serviced about a month ago
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Old 11-08-2015, 10:38 PM   #3
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Checked mine once and pretty sure it was about 135*.
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Old 11-08-2015, 11:08 PM   #4
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Now you have me curious, guess I'll get out the thermometer and check it..
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Old 11-09-2015, 06:24 AM   #5
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Originally Posted by Mr_D View Post
Now you have me curious, guess I'll get out the thermometer and check it..
Ditto. Never checked the actual temp so will do next time we use the coach.

I recently replaced the Webasto in mine with a rebuilt unit so would hope it is running right. Certainly provides plenty of hot water
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Old 11-09-2015, 06:55 AM   #6
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Each Coach and Heat Zone will vary. Depends on how the lines are run to the heat exchangers and if the coach manufacturer used duct work to route the heat to the room vent. Ducting of the exchanger output is not recommended. .

Normal installations the temp will be 125 to 130 degrees. Some will be higher if there is a short run from the AQ to the Heat Exchanger.

Measure the temperature after the exchanger has run for a while. Best way I found is an electronic probe (available Amazon 15 bucks) and check the in, middle and out area of the exchanger.

If you are checking the boiler temp a ole kitchen meat thermometer works pretty good. Good Luck Rick
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Old 11-09-2015, 03:52 PM   #7
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Aqua Hot

Had the unit serviced last Feb due to what I thought was low temp output but no increase in temp. The unit works well otherwise, even checked the boiler temp at the unit and its lower than the spec (175 deg). High limit has been replaced during last service.
Still needs more heat.
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Old 11-09-2015, 05:04 PM   #8
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Two different things being discussed here. Air outlet temperature from the coach air exchangers and AH thermo fluid outlet temperature.

For outlet air temperature (original post question) it can range anywhere near 100 to 140 F. A lot depends on air flow across the exchanger and how cold the cold air is before it crosses the air exchanger. Test a number of the registers and my guess is they all may be a bit different. 100F air outlet temperature is still heating air exchange.

You can check the cleanliness of the air exchanger. It may have dust in the fins preventing good air flow. A blast of compressed air backwards through the air exchanger will help clean it. If you do not have an air compressor you can buy those compressed air aerosol cans that are used to clean computer keyboards.

My suggestions.

Brian
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Old 11-09-2015, 09:14 PM   #9
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It is true that two issues are discussed.....the radiators are clean and unobstructed. Its clear that the higher the outlet air temp will heat a specific volume of air faster than the lower temp therefore the burner doesn't have to run as long (less fuel consumption).

However the lower boiler temp equates to lower output air temp. Its doing the job but I think not as designed....Still no resolution.
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Old 11-11-2015, 11:02 AM   #10
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Quote:
Originally Posted by BrianGlenn View Post
Two different things being discussed here. Air outlet temperature from the coach air exchangers and AH thermo fluid outlet temperature.

For outlet air temperature (original post question) it can range anywhere near 100 to 140 F. A lot depends on air flow across the exchanger and how cold the cold air is before it crosses the air exchanger. Test a number of the registers and my guess is they all may be a bit different. 100F air outlet temperature is still heating air exchange.
I think Brian has an excellent point...it's not so much the temperature coming out of the vent as it is the differential temperature (how much it's heating the air from ambient).

Mark
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