Hi
I'll try to answer a few questions here .....
if you have a ensuite you have a pump, otherwise it's a option
depending on toilet model, some draw from their own built in tank, some from main tank "they" should be setup in this case to start the pump when you flush (no way i can guarantee that, but thats what supposed to happen)
if you have twin tanks you will have a selector valve, new models have a white arrow on them, point this down to draw from both or left and right to pull from individual tanks pointing up you suck air .......
tank fillers, level gauges, selector switch seem to never match the layout, depends on whats easy in the factory, hard to find 2 vans the same ...... for this reason we don't supply written instructions on handover for each van as 9 times out of 10 it's wrong, instead the handover guys are supposed to check over the van first and identify what does what .... seems it works for us. and often we get vans back at first service asking to change fills to match tanks and level gauges etc, these we "usually" do as warranty claims with no cost to customer
playing with the tempering valve can void your warranty on that part of the system, we aren't allowed to adjust them ..... gotta be a plumber for some insane reason ........
basic van setup is water fillers to fill tanks, pump sucks from these into main pressure lines using a selector valve to select tank(s)
mains fitting for site water, connects to pressure side of pump (somewhere) so it supplies everything pump does
main inlet has a non return valve to stop pump squirting water out here, also has a pressure reducing valve otherwise a overzealous davey pump can turn your van into a expensive water sprinkler after blowing all the fittings off .....
Tempering valve mixes hot with cold to extend the heated water supply past the HWS capacity of about 20 litres.
Remember these are designed (with high temp cutout switches) to supply water that won't burn you, if you want hotter water to do the dishes boil the kettle, don't stuff with the temp valve.
Handy hint .... don't poke anything in the inlet or outlet of your HWS trying to clean them, they have a internal elbow to send cold water to bottom and hot to suck out of the very top, knocking these elbows off reduces your hot water capacity by HALF! as the water mixes without layering. Even non standard length Sacrificial anodes will knock the bottom elbow off.
