Air Conditionning flush

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   Hi, an improvement on the AC flushing method! On Night Train the water pump only comes on when one of the AC units is turned on, which meant that the circulating water got very hot last time we flushed it. The water temp kept tripping the AC unit which then turned off the pump!This time I wired in an alternative power supply to the pump so it could run without the AC unit being on. Much easier with an uninterrupted 1 hour of circulation on each unit.
All the best
Paul

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415 Singapore Members Profile Send Private Message Find Members Posts Add to Buddy List Vice Admiral Joined: 23 September 2013 Location: Singapore Status: Offline Points: 935	Post Options Post Reply Quote 415 Singapore Report Post Thanks(0) Quote Reply Posted: 17 July 2023 at 11:32
	Hi, an improvement on the AC flushing method! On Night Train the water pump only comes on when one of the AC units is turned on, which meant that the circulating water got very hot last time we flushed it. The water temp kept tripping the AC unit which then turned off the pump! This time I wired in an alternative power supply to the pump so it could run without the AC unit being on. Much easier with an uninterrupted 1 hour of circulation on each unit. All the best Paul
	Paul - Night Train - 415 #136

32mike Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 26 March 2020 Location: FLorida, US Status: Offline Points: 453	Post Options Post Reply Quote 32mike Report Post Thanks(0) Quote Reply Posted: 17 July 2023 at 12:58
	I just recently did this on my boat after getting the “HPF” error code on the thermostat display. After a little Google research, I came up with my own flushing rig. Materials needed from hardware store - 5 gallon bucket, submersible fountain/pond pump, about 15’ of garden hose, a wide clamp to hold the hoses in place in the bucket and appropriately sized hose barbs, 5/8” in my case. The pump goes in the bucket. I disconnect the overboard discharge end of the cooling water line and connect it to a piece of hose which connects to the pump in the bucket. Disconnect the A/C pump line for one unit and connect that to a piece of hose going to the bucket. Fill the bucket with barnacle buster and plug the pump in. Run it for as long as you like while it back flushes the system. When I’m done, I flush it with fresh water from the dock hose and reconnect everything back up. This summer, the water temperature is off the charts and the growth is astronomical. Hard to keep up with it.
	Mike S/V Dulces Sueños 458 #087 Tampa, FL

415 Singapore Members Profile Send Private Message Find Members Posts Add to Buddy List Vice Admiral Joined: 23 September 2013 Location: Singapore Status: Offline Points: 935	Post Options Post Reply Quote 415 Singapore Report Post Thanks(0) Quote Reply Posted: 17 July 2023 at 14:00
	Hi Mike, from what I understand your method misses out the built in pump and manifold? Having just spent more money than I wanted to replacing the impeller, motor bearings and manifold I would recommend including those bits in your flushing. All the best Paul
	Paul - Night Train - 415 #136

32mike Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 26 March 2020 Location: FLorida, US Status: Offline Points: 453	Post Options Post Reply Quote 32mike Report Post Thanks(0) Quote Reply Posted: 17 July 2023 at 18:41
	Yes, that’s true. The water does get pretty hot with the big pump running with the units on.
	Mike S/V Dulces Sueños 458 #087 Tampa, FL



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