10
1.
Water is heated instantaneously as it flows
over the heating elements in the copper
cylinder (Diagram 6).
2.
The heaters are only switched on when
sufficient water is flowing.
This is done automatically with a switch
which works on water pressure and is
indicated by the LED indicator illuminating.
3.
The water is turned on and off by the
solenoid valve and Control PCB built into
the shower.
This is switched on when button “A”, “B” or
“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 “Effect of
Other Water Devices on Incoming Water
Supply”).
5.
If the water supply falls below a set limit, the pressure switch will operate and switch off the
power to the elements. This is indicated by LED indicator going out (see “Effect of Other Water
Devices on Incoming Water Supply”).
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.
7.
The pressure relief device is to safeguard against abnormal pressure conditions, and provides a
level of appliance protection should an excessive build 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.
Diagram 7 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 “
(Medium)”
power setting may give adequate hot water.
In some
winter
conditions, it may be necessary to select the
inner or outer spray pattern
only of
your shower handset. This will ensure correct operation of the shower with a slightly lower flow rate.
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 69kPa (0.7 bar, 10 psi).
At pressures above 69kPa (0.7 bar, 10 psi) it will minimise temperature fluctuations as detailed
above. If the water pressure falls below 69kPa (0.7 bar, 10 psi) it is likely that the pressure switch
will turn off the power to the heating elements, resulting in a cold shower.
HOW YOUR
SPA300C
SHOWER WORKS