Bosch Heat Pump Dip Switches
Just a quick overview of the dip switches and what they do on the Bosch heat pumps. This was more for the 1.0 18 SEER Bosch line.
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Hey guys before we get to the video, please click that subscribe button, hey guys, joshua griffin here serving the middle peninsula and the northern neck of virginia and want to do a video on the bosch, heat pumps and the dip switches that are on them and what They do and all of that so right now we're going to start out with this video we're going to talk about the bosch 1.0 line. It's the 18 seer line. I've kind of got a little little guide here to to walk us through this, and so basically it breaks it down into two separate banks of dip switches. If you will uh when i say banks, i'm talking about you know actual little.

Banks is what i call them uh. So it's got, you know if it's it's got four dip switches. I call that it. You know it's a bank of four dip switches, yeah and you know, and so sw4.

If you find that on the board, it's got four dip switches and the first two it says not used, i'm not sure if they do control anything but bosh has pretty much said: they're not used, don't mess with them and so they're, usually probably off. So just leave those off the second two we got the dip switch 3 is the adaptive capacity output and if you were to turn it on or up that would disable it okay. So if you leave it off, it's enabled and the book says while in the off position and it's enabled it allows for the coil and condenser target temperature to drift plus or minus four degrees fahrenheit based on previous hour of operation and attempt to optimize runtime. So basically, i i think what it's saying is it's learning from the previous hour, how long you know it's taking it to to reach the temperature and and so on, and so it says it is drifting four degrees and it says reason to disable and zoning applications.

But only as needed as a result of customer expectations and or performance, so they're saying that really the only time you want to turn this dip switch up on or to or to disable the adaptive capacity output. Is you know if you have a zoning system? You have multiple zones, you have dampers that open and close and thermostats in different locations, and you know a fully zoning system. Then you might turn this off if you're having issues the four the the next tip switch, is dip switch four and that one i did a video on this. I want to touch on it again and that is uh dip switch 4 on the bank of force dip switches.

This one is called the accelerated cooling, slash, heating or normal, and you know don't tell bosch this, but i will tell you that we at griffon air, because of our climate, because of some of the issues that we have in our region. We turn this switch on more times than we leave it off. It's a it's, a more accelerated, more aggressive way of cooling, but you know it's. It helps with humidity and things like that, so the book says reduces target coil temperature and cooling to 37 degrees fahrenheit.

I think in normal operation, it's 42, so it's dropping that down to 37 and it increases the target. Coil temperature and heating to 114 degrees, fahrenheit recommended to be used only as needed as a result of customer expectations and or performance. So again, that's probably one that you know i break that rule uh for us, but you know if you're in a drier climate, you probably want to you know, take advantage of the normal operation. It's a little more efficient.
Moving on there's also a bank of two dip switches on the board and it the the manual calls that sw five. So if you're looking at the schematics, it's going to call it sw5, so dip switch number one on that bank of two. It says it functions allows for the equipment to enter defraud sooner than normal used in northern cool climates, where high humidity is common. So that's pretty unique.

We don't normally mess with that in our here in virginia, but if you live in a northern climate cooler climate and it's a higher humidity climate, so that's pretty unique. That's not that's! That's not to say just because you live in a cooler climate or just because you live in a high humidity location that you need to mess with us. So if you were to flip it on it just says that operating time is reduced by 10 percent. If it's off it's normal and that's got to do with how quickly it's going to enter that defrost mode and the second dip switch looks like it's kind of similar to that, and it actually says only used in cooler climates with high humidity and that one again, This is dip switch 2 on the on the bank of two dip switches.

They it calls it sw5 in the schematics and so that second dip switch says it. The function allows for default cycle to be extended from eight minutes to nine minutes and also used in cooler climates where high humidity is common. So again you don't want to mess with those unless you're in a cooler climate with higher humidity, pretty unique, there's only specific areas. I would say in the us that you would even want to fool with that that bank of two dip switches, so that's pretty much.

It as far as the dip switches, i'm gon na, do a separate video on the 1.0 line. Uh talking about the fault codes and using the check button on the board. You know, i hope that helps the dip switches are, are what they are uh they're there for a reason and uh. If your system's working great you probably shouldn't mess with them, you definitely don't want to mess with them unless you're a pro.

So most of the videos i do are geared more towards homeowners, and you know trying to explain some of the things that you know are not always explained very well in our our industry. But you know i thought i'd do a video for you guys if you are doing a bosch, heat pump and you're looking at the dip switches, what they do and whether or not you should be messing with them. If you're in our coverage area, if you're in griffin, airs coverage area, northern neck or middle peninsula of virginia, give us a call, we'd love to earn your business. And if you are not in our coverage area - and you are in the market for a new heating and air system, you got ta check out my new website.
It's called new hvac guide, dot com, i'll put a link to it down in the comments you got. Ta check out that website before you spend thousands, i've got all kinds of information on there. It's basically written like a book, and you know i've got a page on there even called no knows just things to stay away from and a lot of the stuff that we're putting on that website. It's stuff that hvac contractors and manufacturers, don't even want you to know if you're a homeowner so check that out - and we appreciate it.

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11 thoughts on “Bosch heat pump dip switches”
  1. Avataaar/Circle Created with python_avatars leetibbetts says:

    We had a Bova 2.0 BOVA-36HDN1-M20G, Bosch 3 ton coil BMAC3036CNTD, and Trane 2 stage furnace model TUD2C080A9V3VB with Trane 824 thermostat installed for upstairs unit when we bought the house August 2020. Installed on move in day so don’t know what things were like with old unit.

    However, humidity upstairs is high all summer in Alabama. 65-70%. Installer slowed down fan speeds, changed coil temp switch up and down, says everything is installed correctly.

    Old unit was 2.5 ton (or maybe 2) but this was installed as a 3 ton. My question is would it help to have it switched to a lower tonnage? Also, it’s wired as a single stage and I’ve seen some people reference stage 2 of cooling, which mine doesn’t do. Any issues with single stage? Thanks!

  2. Avataaar/Circle Created with python_avatars J Rich says:

    I can’t find the manual for a 2.0 that shows dip switch 19 J2. It’s a 5 ton condenser with a 4 ton air handler. I just wasn’t sure if up was 5 ton capacity and down was 4 ton capacity? Thanks.

  3. Avataaar/Circle Created with python_avatars Michael Tobin says:

    #4 decreases coil temp. We only suggest in certain applications ask me how I know . You did a great explanation of our switches.. I have seen many of your videos, and have seen many oversized units installed, and you were on point with your humidity video. Just because there is a 15 year old five ton installed, doesn't mean a 5 ton is needed. Evey one needs to perform a cooling/heating calc on the home

  4. Avataaar/Circle Created with python_avatars hb82290 says:

    Do you recommend switching dip switch before trying a slower fan speed?

  5. Avataaar/Circle Created with python_avatars David S says:

    Do you have a video on the Bosh96 furnace duel fuel thermostat hookup? Honeywell stat Service area Kanata??

  6. Avataaar/Circle Created with python_avatars Jason Womack says:

    I have a bova-36hdn1-m18m unit and its in voltage protection mode. Any idea how to get it out of it? It has an error code of E5.

  7. Avataaar/Circle Created with python_avatars Michael Elias says:

    What document are you reading? I couldn’t find detailed info like this on the website. Had a 2.0 system installed and I’m not getting humidity reduction like I want. Also have 2 zones. I’m Mass. Are you in Orleans ?

  8. Avataaar/Circle Created with python_avatars SirFishAlot says:

    Thanks, I'm a tech in central VA. Great video

  9. Avataaar/Circle Created with python_avatars Eddie Sellers says:

    And. What’s your protocol for selecting sw4-4 switch on. Meaning powering on/off and for how long?

  10. Avataaar/Circle Created with python_avatars Eddie Sellers says:

    When running through the parameters check is there way the unit let’s you know that accelerated cooling is on? Other than a switch.

  11. Avataaar/Circle Created with python_avatars Robert Griffis says:

    Have you had many issues with the boards? We have replaced two in the past two weeks. Thinking both are from lighting or power surge.

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