Several years ago I received some (hopefully) good advice on this forum reg arding changing and simplifying the plumbing surrounding my thermal store. The store will transform from its convoluted plumbing which was following t he manufacturer's (Gledhill) guidelines to a more simple/standard config in which 1. the boiler heats the store, 2. The solar heats the store, 3. The heating is pumped off from the store. (the much lauded 'neutral point')
The advice on this forum at the time was that I should install some check-v alves to prevent the chance of thermosyphoning via the boiler and/or the he ating, and my question regards this.
The boiler circuit will consist of; pipe from lower part of cylinder into ' cold' side of blending valve (to allow control of boiler return temp and ho pefully force condensing whilst maximising output temperature to heat the t hermal store from the top down). Output of blending valve into pump. Outp ut of pump into boiler. Output of boiler into upper part of thermal store and also via T into 'hot' side of blending valve. My question is; where do I put the check-valve? My thought is between outpu t of boiler and cylinder, but are there any rules, such as always before a pump, or always after a pump etc, or does it really not matter?
Same question regarding the heating circuit; The heating will flow from th e upper part of the cylinder into a pump, and then on to the rads, but shou ld the check valve be before or after the pump?
Finally, I've already got check valves something like this;
Thanks guys.