Jargon translation needed pls

[skb7]

Could someone kindly translate the following please

Max. pressure differential 5:1 = does this mean it can work on an unbalanced system providing the ratio isn't more than 5:1?

All thermostats are adjusted in the factory at a flow pressure
of 3 bar on both sides. = does this then mean it has to be balanced?

pressurized storage heaters? = is this a combi boiler

non-pressurised storage heaters?

downstream resistances?

kind regards,

m

 

[mrgas]

Max. pressure differential 5:1 = does this mean it can work on an unbalanced system providing the ratio isn't more than 5:1?

yes

All thermostats are adjusted in the factory at a flow pressure
of 3 bar on both sides. = does this then mean it has to be balanced?

No

pressurized storage heaters? = is this a combi boiler

No, it means unvented hot water (mains Pressure)

non-pressurised storage heaters?

Gravity hot water systems

downstream resistances?

Means resistances downstream!

This is how I would interpret them without seeing them in any other context.

 

[skb7]

OK, thanks

So what exactly is the upshot of

All thermostats are adjusted in the factory at a flow pressure
of 3 bar on both sides

Does it have to re-calibrated?

 

[mrgas]

Are we talking about shower mixers here?

 

[skb7]

mrgas, we are indeed. A Grohe 1000 to be exact.

Any ideas?

 

[mrgas]

It means that the thermostat was set at the factory using equal pressure (3 bar)hot and cold supplies.
If you fit the shower with supplies of unequall pressures then the thermostat will need to be adjusted by the installer to respond to the availlable water supply pressure.
It is much much better if possible to have equal pressures.
If this cant be achieved be very careful to make sure pressure difference is within manafactures tolerances and make sure that any flow restrictors are fitted and will remain accessable for future cleaning/ servicing.
This last part seems to be impossible in concealed shower valves.

 

[skb7]

OK makes sense now, sounds like it's not the right shower for this system. Thanks mrgas very good of you to help. Much appreciated

 

[mrgas]

what system do you have

 

[skb7]

The pressure is unbalanced in the bathroom, hot comes of the mains via the combi and the cold from the CW storage on the roof four floors up. About 10m, 1 bar I guess?

In theory it should work, in practice though I don't think it will or at least not very well.