wa8yxm wrote:
Ok, IN an RV there are TWO causes of "Hammering" not one like in a sticks and bricks
The first (Never heard it in my RV) is caused by the physics of what happens when you CLOSE a valve. this is called Water Hammer and the advice of the others on this issue is dead on.. The "Arrester" is nothing more than an air chamber that absorbs the Hammer.
The other source which is unique to RV's is the on-board fresh water pump.
This will HAMMER when water is flowing.. The Toilet (And Shower) are the major flow items in the RV.. So if the city water inlet is partially clogged or if the city water pressure is low or if there is any "issue" with city water that limits flow such as a aging pressure regulator.. The on board pump, if powered on (Switch is on) may engage and it can Hammer. even with flex lines to/from it it can hammer... It is, after all, a jack hammer.
A buddy mentioned the same thing about the water pump....we have not used the TT water pump at all...been on 'city' water since we hooked up months ago...I will bleed the outside shower, just in case there is an air bubble.....but why is this problem only happening when filling the bowl after flushing? That's what's puzzling me....!