hot water

[steve jones]

Still need some help on the hot water issue.  Left the rally and returned to the resort in Foley Alabama and hooked up as usual with electric and CITY water.  Cut the shower water on and hot and cold work fine.  Works fine in the bath sink.  We both took showers and worked fine.  So, this only happened when using the pump.  I had just replaced the pump before we left for the rally.  Same pump, and there?s not much room for a mistake hooking it up.  Water supply in and out.  Two wires, and all hooked up just as the previous pump.  Somebody help, I have no idea how the pump could cause a problem with the hot and cold water mix. 

 

[Rene T]

Instead of going back through your previous post, exactly what's happening?

 

[steve jones]

Originally i got to a rally and hooked up electric.  I already had the pump on before i got there and water ran fine out of faucets. We went to take a shower and noticed the water was pulsating from hot to cold.  The bath sink did it also.  I checked the outside shower and any other areas to make sure nothing was on draining it.  All was ok.  Water pressure was fine the whole rally but could not use shower because of the pulsating.  The sinks did it also.  Below tells what happened when i got back and hooked up to city water

Still need some help on the hot water issue.  Left the rally and returned to the resort in Foley Alabama and hooked up as usual with electric and CITY water.  Cut the shower water on and hot and cold work fine.  Works fine in the bath sink.  We both took showers and worked fine.  So, this only happened when using the pump.  I had just replaced the pump before we left for the rally.  Same pump, and there?s not much room for a mistake hooking it up.  Water supply in and out.  Two wires, and all hooked up just as the previous pump.  Somebody help, I have no idea how the pump could cause a problem with the hot and cold water mix. 

 

[Gary RV_Wizard]

Water pressure form the onboard pump is no different than city water pressure once its in the plumbing.  It's possible that the city pressure may be higher or lower than the pump, though, and it varies with what city system you hook to.  Do you know what the city pressure was at your last site? Sometimes city is much higher (or lower) than pump pressure (pump is typically about 45 psi).

Its also possible that the flow through the pump is restricted somehow, e.g. the intake screen on the pump is partially clogged.  In that case, the pump water pressure drops substantially when the demand at the faucet exceeds the supply that can get to/through the pump. That loss of pressure can, under some circumstances, cause an imbalance between the cold and hot plumbing lines. I won't try to explain all those possibilities, but a sticky water heater check valve is one of them.

 

[coolmom42]

There is a check valve at the "back" end of your pump that keeps water from back flowing into the fresh tank.    Could be that it is malfunctioning.

 

[coolmom42]

Also make sure that your outside shower is turned off at the knobs, not just at the shower head.