6
3 SITING AND PLUMBING
3.1
Spend some time planning exactly
where to site the shower heater and riser
rail. Bear in mind the height of people who
will be using it.
THINGS YOU MUST DO
3.2 Check that the water pressure to
the shower is adequate. If in doubt,
consult a competent plumber.
Maximum and minimum pressures are:-
Maximum - 1 MPa
Minimum
- up to and including 9.5kW: 0.09 MPa
- Over 9.5kW: 0.11 MPa
Running pressure with at least 5 l/min
flow rate
The use of other services connected to
the water pipe supplying the shower heater
may cause the water pressure to drop
below the minimum. Therefore this should
be taken into account.
The following conversions may be useful:
1 bar
= 14.5 lbf/in²
= 33.3 ft head of water.
= 10m head of water
= 0.1 MPa
1 lbf/in² = 2.3 ft head.
3.3
Electric shower heaters are normally
plumbed into the mains water (except for
special low pressure versions). However,
the shower heater may be fed from a
storage tank as long as there is a sufficient
head of water.
3.4
Mount the shower heater on a flat
vertical wall with the outlet, to which the
hose is connected, pointing downwards,
using three suitable wall plugs and screws.
3.5
DO NOT place the shower heater
where it will be in the direct spray from a
normally-parked handset.
Figure 4 Siting of riser rail and heater
25mm minimum
Lowest possible
handset position
Bath/Shower Tray
610mm (24)
Highest Position
Riser rail
Hose-retaining ring
Lowest position
Shower
heater
305mm (12)
3.6
Allow room around the shower heater
for removal of the front cover.
3.7
Position the riser rail close to the
heater, not necessarily on the same wall
(but bear in mind paragraph 3.5) so that
in its highest parked position, the handset
is not more than 610mm (24”) above the
bottom of the heater, and in its lowest
position it is no lower than 305mm (12”)
below the heater - see Fig. 4.
3.8
If the handset can reach to within
25mm (1”) of the spillover level of the bath,
shower tray, wash basin, WC or bidet, then
to prevent the possibility of back-
siphonage of used water (Water
Regulations Guide G15.14/R15.14) you
must either:-
1. Fit a hose-restraining ring - see Fig. 4.
15
Make adjustments carefully. Give the
shower a few seconds after each
adjustment to stabilise, then check the
temperature by hand before stepping into
the shower. Note the number of
temperature indicators lit, this will aid in
setting your ideal temperature when next
using the shower.
4. The ‘MED’ and ‘LOW’ power settings
allow you to choose the power used
by your shower heater. These settings
use less power and can be used in
the warmer periods when incoming
water temperature is higher. They can
also be used to obtain a cooler spray
without adjusting the water control
knob.
A cold shower cannot be obtained.
8.2 To turn off the shower:
1. Press the ‘START/STOP’ button.
Water will continue to flow and the
‘PHASED SHUTDOWN’ light will flash
for a few seconds. This feature
purges the hot water from the heater
can to ensure there is no hot ‘slug’ of
water if the shower is used again
shortly after.
2. Turn off your isolating switch.
8.3 Warning Lights
1. ‘LOW FLOW’. If the water control
knob is turned too far clockwise, the
pressure switch will turn off the heating
elements and the ‘LOW FLOW’ light
will flash. Turn the water control knob
anticlockwise until the indicator stops
flashing.
2. ‘USER PROTECT’. This feature
prevents the spray temperature
reaching harmful levels. Refer to
sections 5.51 and 5.52.
Please note that this shower is
not
thermostatic, it will not keep spray
temperature constant whatever the
change in external influence.
Figure 12 External features of shower
START
STOP
USER
PROTECT
HIGH
LOW FLOW
MEDIUM
INSPECT
HANDSET
LOW
PHASED
SHUTDOWN
Stop /Start button
and indicator light
Power setting buttons
and indicator lights
Water Control Knob
Temperature
Indicator display
User protect
Low flow
Inspect handset
Phased shutdown
Indicator lights
