Power to single brushless ARB compressor

[Roger123]

Your evaluation is spot on. I don't live in a hot climate but many of my adventure trips can get see very high temperatures. That is the main reason for my concern.

I still would like to be able to totally switch off the power to the compressor in these hot conditions. I would only do it when I don't need to use the compressor. If the fan runs do to engine heat soak, the fan would not cool the compressor anyway. I could still leave it on for a short time after running the compressor to get the temperature down some.

I am not going to do anything until I see if the compressor fan kicks in without running the compressor.

You could run a relay in line with main power from the battery to the compressor. Trigger it from the same source (Aux 6) that triggers the compressor.

It would need to be a pretty heavy duty relay.

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[CalvinT]

OP still hasn't determined if he has a heat soak problem or not. He's hypothesing.
1. He doesn't know what temperature the compressor fan turns off or on.
2. He doesn't know how hot the compressor will get on a hot day because of heat soak.
3. He doesn't know how hot the compressor mount gets during normal driving. The compressor will be cooler.
4. Does the fan draw enough current for it to be a problem if it does come on?
5. All this is mental masturbation until he has that information.

Even if the fan does come on due to heat soak, it will turn off again once temperature drops.

My take. It won't come on due to heat soak even if he drives his Bronco at 1-2 PM in Phoenix in the middle of July.

 

[gbub]

You could run a relay in line with main power from the battery to the compressor. Trigger it from the same source (Aux 6) that triggers the compressor.

It would need to be a pretty heavy duty relay.

That is something I will consider if determine I need to do something about it. Thank you for giving me a another way to resolve a potential issue.

 

[gbub]

OP still hasn't determined if he has a heat soak problem or not. He's hypothesing.
1. He doesn't know what temperature the compressor fan turns off or on.
2. He doesn't know how hot the compressor will get on a hot day because of heat soak.
3. He doesn't know how hot the compressor mount gets during normal driving. The compressor will be cooler.
4. Does the fan draw enough current for it to be a problem if it does come on?
5. All this is mental masturbation until he has that information.

Even if the fan does come on due to heat soak, it will turn off again once temperature drops.

My take. It won't come on due to heat soak even if he drives his Bronco at 1-2 PM in Phoenix in the middle of July.

Thank you for summarizing what I don't know at this time. I had already figured out what I don't know though. I guess it was for others that don't know what I don't know.

As to the mental maturation comment, I don't agree. I get no pleasure thinking about these things. When I take on a project, I try to see a mental picture before I start so I can minimize wasting my time testing and trying different things that don't help me. I started this thread to get new ideas about this issue. I have gotten some very good information and appreciate it. If you don't like that way I approach things because it is not what you would do it, that is your choice but it will not change the way I do things. I have learned methods of doing things in my 78 years of life and they have served me well for the most part.

If the compressor fan come on from heat soak from the engine, the fan will not cool the compressor. It will just be circulating hot air. Air circulating ovens are very useful in getting parts up to temperature quicker than non air circulating ovens. If the heat is shut off the air circulating will cool quicker too, but that requires non heated air to be coming in.

I hope you are right about driving in Phoenix at 1-2 PM in the middle of July. Did you get any pleasure in that thought?

 

[CalvinT]

Thank you for summarizing what I don't know at this time. I had already figured out what I don't know though. I guess it was for others that don't know what I don't know.

As to the mental maturation comment, I don't agree. I get no pleasure thinking about these things. When I take on a project, I try to see a mental picture before I start so I can minimize wasting my time testing and trying different things that don't help me. I started this thread to get new ideas about this issue. I have gotten some very good information and appreciate it. If you don't like that way I approach things because it is not what you would do it, that is your choice but it will not change the way I do things. I have learned methods of doing things in my 78 years of life and they have served me well for the most part.

If the compressor fan come on from heat soak from the engine, the fan will not cool the compressor. It will just be circulating hot air. Air circulating ovens are very useful in getting parts up to temperature quicker than non air circulating ovens. If the heat is shut off the air circulating will cool quicker too, but that requires non heated air to be coming in.

I hope you are right about driving in Phoenix at 1-2 PM in the middle of July. Did you get any pleasure in that thought?

You have two years on me. Over the years I"ve learned to priorize what I'm going to obsess about. I want to be sure a problem exists or not before spending time on it. I tend to be OCD and very detail oriented, but I don't care if anal-retentive is hyphenated or not.

My post was mostly to clarify what is known and what is not known. I made the Phoenix comment only to emphasize my thought that heat soak won't be a problem.

Thinking a bit more, did you ever consider that the compressor mount will act as a heat sink and conduct heat from the compress into the chassis? That path would carry more heat than what might occur due to heat soak.

The other unknown is what what thermostat setting is for the cooling fan. If it's above the boiling point of water, heat then soak isn't a concern. A call to ARB would answer that question.

 

[kcarsey]

Arizona Bronco owner here. I have the Dual brushless compressor under-hood of my bronco with the ARB mount, Passenger side near the wiper fluid reservoir. The compressor is wired exactly how ARB shows, direct to battery with 6awg and the upfitter switch under the hood, the relay, key on power, etc.

It's 108f out today, after driving around for 30 mins, park in the garage and shut bronco off, open hood and it's so hot I can't even touch the motor or any part of the compressor. Fan is not running. Same story if I just pull in, leave the bronco running.

If I start the compressor for any amount of time, with the under-hood temps high, the fan will continue to run for an indeterminate amount of time after I turn the compressor off, with the truck running.

IF I turn the truck off, the fan will still run, but I think it's time limited.

If I turn the compressor on and everything under the hood is cold, the fan will run while it's pumping, and for a short time after, depending on how long I use the compressor.

I've also noticed that the compressor runs a bit faster when it's cold. If everything is hot under the hood, it runs maybe 15% slower. I'm assuming it's temp throttling it's self, which is expected behavior according to ARB.


So in summary: the fan will never turn on if the compressor is not turned on, reguardless of temps.

IF the compressor is used, and under-hood temps are high and heat soaked, it will run for a period of time, even with the bronco turned off. Thus far i've had it run as long as 3-4 minutes, but i'm not sure if there is a time limit.

 

[gbub]

I am not in high heat area but I have come to the same conclusion. Yesterday, I aired up my tires and the compressor got pretty hot. When I was finished and shut off the engine the compressor fan was running but shut off after about 30 seconds.

I don't know why when I first installed the compressor the fan ran so long with just a short run time on the compressor. The compressor was just barely warm. Maybe it has a learning system.

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