HPF switch

Carsnmorellc

Has anyone replaced theirs?  I know where it is at, I have a new one, just have zero idea how to get it off.

Dream_Inn

I can't say I've ever seen anyone have to replace this.  I've seen causes that just slow the water output give this fault.  Blowing water backwards thru the condenser fix it.  Also seen where cleaning the bottom (input side of seacock) fix it, as well as easy stuff like cleaning strainer.  I'm assuming you've probably already discussed all this on here already.  I would be curious, for future knowledge, how to do this as well.  

You may also want to try this website (which many years ago was very good and active, but may still have an answer already posted)

https://marine-ac.com/forum/?search=1&new=1&forum=all&value=hpf&type=1&include=1

Black_Diamond

Flushing with this stuff does wonders:

https://www.amazon.com/Barnacle-Buster-Concentrated-Marine-Remover-1/dp/B014RD7XIW/ref=asc_df_B014RD7XIW/?tag=bingshoppinga-20&linkCode=df0&hvadid=%7Bcreative%7D&hvpos=%7Badposition%7D&hvnetw=o&hvrand=%7Brandom%7D&hvpone=&hvptwo=&hvqmt=e&hvdev=m&hvdvcmdl=%7Bdevicemodel%7D&hvlocint=&hvlocphy=&hvtargid=pla-4584413736088399&psc=1

I used it to flush my AC system and shocking what it flushed out. 

davidbrooks

They are soldered in.  You have to sweat them out, solder in a new one and then pull a vacuum on the system.  So that really means you need to be an AC mechanic.  I was getting errors on mine and realized it wasn't water flow.  So i smacked it with a wrench a few times and it hasn't given me a problem since.  I was on the phone with a local marine AC mechanic and was going to have them come out and replace mine.  Haven't needed to since i gave mine a small attitude adjustment.

Liberty44140

Black_Diamond said:

Flushing with this stuff does wonders:

https://www.amazon.com/Barnacle-Buster-Concentrated-Marine-Remover-1/dp/B014RD7XIW/ref=asc_df_B014RD7XIW/?tag=bingshoppinga-20&linkCode=df0&hvadid=%7Bcreative%7D&hvpos=%7Badposition%7D&hvnetw=o&hvrand=%7Brandom%7D&hvpone=&hvptwo=&hvqmt=e&hvdev=m&hvdvcmdl=%7Bdevicemodel%7D&hvlocint=&hvlocphy=&hvtargid=pla-4584413736088399&psc=1

I used it to flush my AC system and shocking what it flushed out. 

Hey BD, how do you flush the system?

Carsnmorellc

Right when I turn my system on it immediately goes to HPF. Does not allow for anything to try and start.  I jumped the switch on the board and it then works great. Tons of water flow, cold air, and I ran it about 30 minutes with zero issues.   

Black_Diamond

so, I bought some cheap 5/8” garden hose, cut an end off, attached to the output of the AC water line, other end I ran back to near the AC water pump and into a 5 gal bucket. 

In the bucket I used an old bilge pump with the output connected to the water line leading out of the AC water pump (bypassing the pump). Mixed the barnacle buster as instructed. Circulated the mix for ~1/2 hr. 

You could run it thru the AC water pump but it needs gravity fed water to prime it. Too much to mess with. 

After getting my system cleaned out I am going to do this annually. 

BTW it will improve your AC / heat performance with the scale removed. 

Liberty44140

Very interesting Bd, May have to do this, this summer

Carsnmorellc

Whoever said to hit the HPF switch!?!?! You're my hero!! I went down there today, put the board back together. Slapped the switch a few times with my handy dandy flash light and bam she's working again!  You saved me pulling the entire unit out.

laureniac1

Black diamond any picture of your bucket set up? The hose on output? Like by the water line and ran house back into boat 

Black_Diamond

I will get some this weekend. 

Liberty44140

Planning to do this barnacle buster circulating deal in the next couple of weekends on my ac units. They work fine but two dock mates had to replace their units this week so I’d like to be pro active, and they claim their new units are much colder so with my air filters clean this would be the only other thing not clean. Would be great to cool faster. Plan is to do both at once since after the pump there is a y to send water to both units and then I’ll use garden hose to run both returns back to the bucket. Question is, is 1 gal of mix enough or do I need to buy the 1 gal concentrate and make 5 gallons of mix (4:1)?