I have two Navien NR-240 tankless on-demand water heaters that lead to a holding tank feeding 7 self service bays. The incoming water pressure is regulated to 60PSI and passes through a water softener first before going to the water heaters. Problem is, during moderate use, one of the water heaters has issues keeping up with at least 30PSI water flow to maintain operation because of other demands of the car wash. This eventually leads to emptying of the holding tank and starving pumps.
I contacted the city about this and they said I could get a higher pressure PRV to allow up to 100 PSI into the system. I first tried cranking down the pressure set screw on my existing 75PSI max regulator and got it to 95PSI not under load. Of course under load it dips back to 60 -70. I then removed the set nut on the threads so I could crank the set screw down even more and got it to 130 PSI but the PRV started leaking (very old and rusty) so I had to back it off to 80PSI no load.
I have a plummer coming in next Tuesday to install the larger high pressure regulator but until then he said I could just bypass the regulator if I needed to if it is leaking too bad. I guess that would be the ultimate test to see if the higher pressure will fix my capacity problem. I’m not sure if 130PSI will cause other issues but for the short time I had it up there nothing happened.
Any thoughts?
I contacted the city about this and they said I could get a higher pressure PRV to allow up to 100 PSI into the system. I first tried cranking down the pressure set screw on my existing 75PSI max regulator and got it to 95PSI not under load. Of course under load it dips back to 60 -70. I then removed the set nut on the threads so I could crank the set screw down even more and got it to 130 PSI but the PRV started leaking (very old and rusty) so I had to back it off to 80PSI no load.
I have a plummer coming in next Tuesday to install the larger high pressure regulator but until then he said I could just bypass the regulator if I needed to if it is leaking too bad. I guess that would be the ultimate test to see if the higher pressure will fix my capacity problem. I’m not sure if 130PSI will cause other issues but for the short time I had it up there nothing happened.
Any thoughts?