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Old 06-13-2011, 06:02 PM   #1
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11k BTU up to the task

I have to say I'm pleasantly surprised. Was expecting that summer camping in Texas in AS would be a challenge from a comfort standpoint but after running Thumper's 11K BTU Penguin all day on low cool, sitting in full sun in front of the house, the interior is very pleasant. Not down to the 74 in the house but considering the size of the Penguin, very comfortable. Looks like careful selection of shaded campsites and judicial use of the awning will pay great dividends.
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Old 06-13-2011, 07:20 PM   #2
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Good to know
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Old 06-13-2011, 08:24 PM   #3
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Just a quick note about running your A/C unit on 'low cool'.

This is OK in relatively dry climates, but when you run the unit on anything but 'hi cool' in a humid environment, the lack of sufficient air distribution across the evaporator coil is one of the leading causes of evaporator freeze-up.

If you notice your cooling not up to par or you are getting a drip inside the coach, you probably have evap. freeze-up. the remedy is to run on 'hi fan' only for a while to let the evap. defrost, then resume cooling, but on hi.
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Old 06-13-2011, 09:54 PM   #4
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Thanks

Alternated between low med and high some during the day.. but thanks for the warning. Looks like condensation tube was working properly judging by the water under the trailer. but will keep it in mind when venturing to more humid climes.
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Old 06-13-2011, 10:45 PM   #5
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Quote:
Originally Posted by lewster View Post
Just a quick note about running your A/C unit on 'low cool'.

This is OK in relatively dry climates, but when you run the unit on anything but 'hi cool' in a humid environment, the lack of sufficient air distribution across the evaporator coil is one of the leading causes of evaporator freeze-up.

If you notice your cooling not up to par or you are getting a drip inside the coach, you probably have evap. freeze-up. the remedy is to run on 'hi fan' only for a while to let the evap. defrost, then resume cooling, but on hi.
Lewster is correct. I have done this several times. Low speed really cools better. So cool that the coil will become a block of ice. I use low some times but leave on high most of the time.If the fan is running and no air is coming out it is froze up.
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Old 06-14-2011, 12:49 AM   #6
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Hi, with the built-in thermostat, [not the one on your wall] your air conditioner compressor should cycle, preventing freeze-up. Same with your car, on low speeds, your compressor cycles. The only time I have ever seen a car's evaporator freeze was with a defective thermostat or one that was removed from the fins of the evaporator core. Most air conditioners don't cycle on high fan mode.
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Old 06-14-2011, 06:43 AM   #7
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Hi, with the built-in thermostat, [not the one on your wall] your air conditioner compressor should cycle, preventing freeze-up. Same with your car, on low speeds, your compressor cycles. The only time I have ever seen a car's evaporator freeze was with a defective thermostat or one that was removed from the fins of the evaporator core. Most air conditioners don't cycle on high fan mode.
.

With all due respect; if you would like to take that up with the engineers and design techs at Dometic and RVP (Coleman) I would be glad to send you their contact information.

It is NOT the cycling that causes the freeze-up, but insufficient air blowing across the evaporator which results in the incomplete heat transfer across it, allowing it to continue to get colder that designed and freeze (there are other factors that can contribute also).

Most RV roof A/C units DO cycle regardless of the fan setting as it is the thermostat that calls for the compressor to engage. Low cool with the thermostat set to very cold is an invitation for freeze-up. Hi cool, OTOH, will have sufficient heat transfer across the evaporator to keep it from freezing, even on the coldest thermostat setting.
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Old 06-14-2011, 06:50 PM   #8
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.

With all due respect; if you would like to take that up with the engineers and design techs at Dometic and RVP (Coleman) I would be glad to send you their contact information.

It is NOT the cycling that causes the freeze-up, but insufficient air blowing across the evaporator which results in the incomplete heat transfer across it, allowing it to continue to get colder that designed and freeze (there are other factors that can contribute also).

Most RV roof A/C units DO cycle regardless of the fan setting as it is the thermostat that calls for the compressor to engage. Low cool with the thermostat set to very cold is an invitation for freeze-up. Hi cool, OTOH, will have sufficient heat transfer across the evaporator to keep it from freezing, even on the coldest thermostat setting.
Hi, Lewster. And with the same respect, First high lighted: It is the cycling that prevents freeze up. [not causes it] Second high lighted: This is so true. That is why the A/C cycles more on low fan speeds.
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