User guide

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3. Mains pressurised instantaneous hot water shower, heated from a
thermal store
Packages of this type, fitted with a tempering valve can be used.
A drop tight pressure reducing valve MUST be fitted if the supply pressures
exceed 5 bar maintained.
An expansion vessel MUST be fitted (and regularly maintained) if any form of
backflow prevention device is fitted, e.g. non-return valve, PRV. This will
ensure that excess expansion or pulse pressures do not damage the product
or the plumbing system. The expansion vessel may already be fitted externally
or internally within the thermal store (check with thermal store manufacturer).
COLD HOT
Figure 3
4. Pumped showers (inlet pumps)
The shower can be installed with an inlet pump (twin impeller). The pump
MUST be located on the floor next to the hot water cylinder. The hot water
cylinder/vent pipes must be arranged as shown to achieve air separation.
90 °
30 to 60 °
Air Separation
Figure 4