Altherma Combination Valve

[Robocool]

Morning Gents

Can any one tell me what the 4 ports on the altherma combination valve are for. I believe one is for cold water in, another is for cold water out (to the hot water cylinder) and a third is for the pressure relief valve.

I understand the 4th connection is capped off, but why include such a connection.

Also if the combination valve restricts the water pressure to 2.1bar, is a separate pressure reducing valve needed on the cold water outlets to balance the pressure at mixer valves etc

Thanks in advance

[frank]

Robocool

You've answered your own question mate.
The 'spare' outlet is for cold water to the rest of the house so that you have equal pressures at any mixer taps/showers. If you don't need it, just cap it off.