4
1. Water is heated instantaneously as it flows over the
heating elements in the copper cylinder (diagram 2).
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 neon light
illuminating depending on the power selected by
outer knob “A”.
3. The water is turned on and off by the solenoid valve
built into the shower.
This is switched on when outer knob “A” is clicked
clockwise.
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 the neon light 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.
Effect of Seasonal Incoming Water Temperature Changes
The required water temperature is achieved by adjusting the rate of water flow.
Diagram 3 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
th
roughout 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 tempera
In some summer conditions, 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 operating 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 eleme
nts, resulting in a cold shower.
This will be indicated by the neon light going out.
HOW YOUR ACTIVE 350S SHOWER WORKS
(12 pages)
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