Thankfully whoever installed your Rinnai was thinking the unit would need to be flushed and descaled. I had to specify it for my installs. Thanks for watching and writing in.
@cfldriven - My setup is similar to this, but I have a filter in front of the cold water input. So in order to clean the unit, I assume I would turn off the cold supply before the filter. Then turn the second cold valve like in your photo to the closed position, connect the hose to the service port and the pump. Then on the hot side, close that valve, then connect the second hose to the service port, and then place it in the bucket. Then turn on the pump and flush. Is that correct? Thanks for the video!
@@cfldriven Thanks for your quick reply. I just finished the flush and water did not squirt out when I opened the caps. Just some water leaked out slowly.
So, it's not that different from descaling a Cleveland Steamer Boiler, aside from the inlet filter, and using vinegar rather than descaling fluid! Thanks for an informative video!
My instructions are taken from Rheem's Technical Service Bulletin RTG1101 ST(07/06). Perhaps the procedure in the video also achieves the same thing. In either case you want the solution going through the heat exchangers to flush out lime and scale.
Thanks so much I have the same setup with the valves on my rinnai and i thought I needed the isolation valve
Thankfully whoever installed your Rinnai was thinking the unit would need to be flushed and descaled. I had to specify it for my installs. Thanks for watching and writing in.
@cfldriven - My setup is similar to this, but I have a filter in front of the cold water input. So in order to clean the unit, I assume I would turn off the cold supply before the filter. Then turn the second cold valve like in your photo to the closed position, connect the hose to the service port and the pump. Then on the hot side, close that valve, then connect the second hose to the service port, and then place it in the bucket. Then turn on the pump and flush. Is that correct? Thanks for the video!
Yes and don't forget to disconnect power to the tankless. Don't use the power switch to turn it off.
Since there is no secondary isolation valve, will water squirt out when you remove the service caps?
Baron, only if you have it in the wrong position. Normally there should be no squirting, although there maybe some dripping.
@@cfldriven Thanks for your quick reply. I just finished the flush and water did not squirt out when I opened the caps. Just some water leaked out slowly.
@@baronfung2621 Congrats on getting the job done. Don't forget to clean the filter. th-cam.com/video/jQ7Y6ujFbWg/w-d-xo.html
One more thing, the heater is rated for 4.6 gpm, so the descaler pump should be equivalent or better, correct?
The tankless is not running so it doesn't matter what your pump gpm is as long it circulates the solution.
So, it's not that different from descaling a Cleveland Steamer Boiler, aside from the inlet filter, and using vinegar rather than descaling fluid! Thanks for an informative video!
Just make sure to disconnect power to the unit rather than using the shut down button.
Thanks
And thank you for watching.
The internal valve is supposed to be closed according to Rheem - th-cam.com/video/hB8SPT-Ez0M/w-d-xo.html
My instructions are taken from Rheem's Technical Service Bulletin RTG1101 ST(07/06). Perhaps the procedure in the video also achieves the same thing. In either case you want the solution going through the heat exchangers to flush out lime and scale.