15
1.
Water is heated instantaneously as it flows over the heating elements in the heat exchanger
(fig.19)
.
2.
The heaters are only switched on when sufficient water is flowing.
This is done automatically with a switch which works on water pressure.
3.
The water is turned on and off by the solenoid valve built into the shower.
This is switched on when Button ‘C’ is pressed.
4.
The flow of water is automatically held at the level set by the user even though the supply
pressure may vary (see ‘Advice to Users’).
5.
If the water supply falls below a set limit, the pressure switch will operate and switch off the
power to the elements, resulting in a cold shower (see ‘Advice to Users’ on page.2).
6.
As a further safeguard
, a thermal cut-out switches the power off if the water temperature
climbs above the set limit.
This cut-out, which gives an audible click, may also operate due to residual heat when the shower
is switched off.
It will reset itself if water is run through the shower for 10 to 20 seconds light will go out.
7.
The pressure relief device is to safeguard against abnormal pressure conditions, and provides a
level of appliance protection should an excessive build up of pressure occur within the shower.
Effect of Seasonal Incoming Water Temperature Changes
The required water temperature is achieved by adjusting the rate of water flow.
The diagram shows the principle involved in relating temperature rise to flow rate.
The higher the water rate the lower the temperature and vice versa.
The temperature of the water supplied from the mains can vary
considerably throughout the year from 5 to 20°C.
This means that in the winter, flow rate will be less than in the summer
to achieve the same outlet temperature.
In summer the
‘ECO’
power setting may give adequate hot water.
Effect of Other Water Devices on Incoming Water Supply
Your shower is
designed to stabilise temperature
changes caused by water pressure
fluctuations.
These can result from toilets being flushed or taps being turned on and off.
When this happens your showering temperature will be held within a controlled band, provided that
the minimum pressure required by the shower is maintained.
Your shower requires a minimum running supply pressure of 100kPa (1.0 bar, 15 psi) at a minimum
flow rate of 8 litres/minute (
9 litres/minute for 9.5kW).
At pressures above 100kPa (1.0 bar, 15 psi) at a minimum flow rate of 8 litres/minute.
(
9 litres/minute for 9.5kW),
it will minimise temperature fluctuations as detailed above.
If the water pressure falls below 100kPa (1.0 bar, 15 psi) at a minimum flow rate of 8 litres/minute,
(
9 litres/minute for 9.5kW),
it is likely that the pressure switch will turn off the power to the heating
elements, resulting in a cold shower.
HOW YOUR SHOWER WORKS
