Issue 6 07/04/2022
7
If an Automatic Fill version is to be installed then the overflow must be run to a suitable
drain point. A tundish is supplied if the overflow termination is difficult to see. The
tundish must be fitted vertically, with continuous fall of the overflow pipe.
The overflow should be run in either 22mm copper tube or high temperature overflow
pipe with suitable supports. Ensure that the overflow is capable of coping with a ball-
valve fail situation and restrict flow to the ball-valve accordingly.
Showers
•ELECTRAflow is compatible with all showers.
•Most commonly used are of the Thermostatic Mixing type. All mains pressure
systems are subject to dynamic changes particularly when other hot and cold
taps/showers are opened and closed. This will cause changes in the inlet hot
water temperature and pressure at mixed water outlets such as showers.
•Careful consideration should be taken in selecting specification of the shower
valve to ensure the correct mixed water temperature and pressure is
maintained and that it is suitable for the type of people using it.
•Some showers in the TMV2 range have about a 10 degree differential between
the hot inlet temperature and the mixed outlet temperature, allowing
showering temperatures of up to 48 degrees.
•Other valves such as TMV3 only allow maximum temperatures of 41 degrees.
•Commissioning should ensure that the hot draw off from the thermal store is
set taking this into account.
•Please ensure that the shower head is capable of taking mains pressure.
•Please ensure that the shower tray drain is capable of handling the shower
head flow rate. A flow restrictor may be required in the shower outlet hose.
•The hot water supply to a shower-mixing valve should be fed wherever
practical directly from the ELECTRAflow or be the first draw-off point on the
hot circuit.
•The cold supply to a shower-mixing valve should wherever practical be fed
directly from the incoming mains. To ensure balanced pressure for the shower
mixing valve, a pressure reducing valve must be fitted after the stopcock of
where the incoming cold supply enters the property.
•The shower must incorporate or be fitted with the necessary check valves to
provide back-syphonage protection in accordance with the Water Regulations.
