Combi HP thermostatic mixer shower
packages with a cold take off after the pressure reducing valve to the cylinder.
The layout and sizing of pipework must be such that nominally equal inlet supply pressures are achieved and the effects of other
d)Mains pressurised thermal store
(fig.5)
Packages of this type, fitted with a tempering valve (blender valve) can be used. A drop tight pressure reducing valve must be fitted if the supply pressures exceed 5 bar maintained.
Fig.4 diagrammatic view (not to scale)
Mixer shower
Safety devices
not shown
Service valves
An expansion vessel (shown in fig.5) must be fitted, and regularly maintained, to make sure the unit is not damaged by excess pressures. This may already be installed externally or internally within the thermal store (check with thermal store manufacturer).
The layout and sizing of pipework must be such that nominally equal inlet supply pressures are achieved and the effects of other
Unvented hot water storage unit
Pressure
reducing valveExpansion vessel
Pressure | Balanced cold |
reducing valve | mains supply |
Cold mains supply
Stop tap
T00223
Fig.5 diagrammatic view (not to scale)
Mixer valve
Service
valves
Hot Blender water valve
Expansion |
|
vessel |
|
Pressure |
|
reducing valve | Return Flow |
Stop tap | Boiler |
|
Cold mains supply
T00224