12
1.
Water is heated instantaneously as it flows
over the heating elements in the heat
exchanger (fig.15).
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 and
the ‘auto reset’ light will illuminate.
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, and the ‘auto
reset’ 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
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.
