Couldnt you just open the cold after a flush and leave the bypass hot hose running to a drain and flush it well before opening it to the system? Wouldn't that prevent flushing at every faucet? Or did I misunderstand that?
It appears my recirculation line has been routed to be used to heat my forced air hydro furnace. I'm figuring i need to descale both systems but there is no way to flush the furnace side of the system that i can figure out. I have a shutoff valve above a faucet on the recirc port below the water heater and a shutoff valve before it connects back to the hot water line for the house. Then the usual hot and cold water service ports with an expansion tank before the cold water port. I have a Navien 240A. Any advice?
Hi I’m following this process with the same tankless unit. My pump is running, service ports open, no fluid being circulated. Any troubleshooting tips?
I have a Navien combi unit., domestic hot water and heating water for a radiant heating system. I have done one service so far. i used white vinegar in the descaling process for 45 minutes, with a portable sump pump in a bucket. My water filters were clean, even after 1+ years of continuous use. There was one more step in cleaning the air intake filter to the unit, which you didn't mention on your unit. An other filter serviced was the acid neutralizing cartridge for the unit's condensate.
Thank you for the comment. We did run the pump for another 20 minutes I had to change the PC board and front controller due to a electric surge. That’s why the unit was flashing red. That’s correct about the air intake, I will be doing that on the normal flush video I will be doing. Mike
Always enjoy your videos. Some of the best. I do want to clarify one statement you made about the INT/EXT valve setting inside the unit. You said that if you have an external pump that you would need to set it to EXT. That’s true but so as not to confuse folks, you also need to set the valve to EXT if you use a dedicated recirculation line without an external pump since the internal pump will provide the flow for recirculation. (BTW I wish I had seen this video before I did my first annual descaling. I would have save the cost of the portable external pump I bought for my bucket!)
I did not know about using the internal pump to descale and other YT videos never show this. If you are using internal circulation and have a service valve on the recir port, can you still use this method?
@@ThatTanklessGuy I have the same question. I have a natural gas, 240a model but cannot find the descale setting in the advance/service menu. Can the recirculation pump be used on the 240A as you have done for the 240A2?
