Gainsborough SV800 User manual

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SV800
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~-I+It\-~
Removable Bottom Section
Fixing Lug
Neon Board Stop/Start Switch Live Terminal Block Fixing Lugs
Pressure Switch
Backplate Front Cover
Power Selector
Switch
Thermal Cut-out
Heat Exchanger
Low Flow Neon Alignment Post
Water Control valve Earth Terminal
Block
Outlet Pipe incorporating
Pressure Relief Device
Solenoid
Valve~ Drain Slot
Figure 1.0 Major Internal Components
Inlet Spigot
High
Low
. Stop/Start
Stop/Start
SWitch
Red
Brown
Blue
Red
Red
Figure 1.1 Internal Circuit Diagram SVSOO 9.5/10.SkW
a
Black
While
Red

CONTENTS
Slop/Start I
Switch
Red
Brown
Low Flow [:Jl:===-/
Neon
Blue
Figure 1.2 Internal Circuit Diagram SVSOO S.SkW
Black
Greenl
Yellow
White
Red
I
i
NB Due to product variations the precise appearance ofyour shower may not be
exactly as depicted
in this leaflet. Dimensions and functioning are unaffected.
II

SECTION ONE
Important Information
Your shower is designed and tested to the
very highest standards and complies fully
with
all of the relevant national/intemational
standards for safety and reliability.
The shower
is manufactured in a
BS
EN ISO 9002-registered factory your
assurance
of a quality product.
To ensure correct use and maintenance of
the shower, please read and adhere to the
following warnings and guidelines.
For Installers:
1.1 Do not attempt any of the electrical or
plumbing work necessary to install this
product unless you have
good practical
experience and adequate understanding
of
the lEE Wiring Regulations and Water Bye-
Laws.
1.2 WARNING: THIS APPLIANCE
MUST BE EARTHED.
1.3 Before removing your shower heater
cover always ensure your shower heater is
isolated from the electrical mains.
1.4 This product is splash-proof, and is
approved for use
in shower cubicles and
over baths. However,
do not install the
shower heater
in a position where the
handset, in its normally-parked position, will
consistently direct spray over it.
1.Sa We strongly recommend that you fit
an isolating valve in the pipework to the
shower,
in an accessible place. This will be
of great benefit if any maintenance work, or
complete replacement of the shower, is
required later on.
1.Sb This shower is designed for domestic
use and
is not vandal-resistant. If it is installed
in an institutional or commercial situation,
frequent inspection may
be necessary, and
our guarantee may
be affected.
a
For Users:
1.5 If water emerges from anywhere other
than the spray head outlets,
do not use your
shower, and refer to the fault-finding section.
1.6 IT IS IMPORTANT TO CLEAN
THE HANDSET SPRAY PLATE
REGULARLY, particularly
in hard water
areas, where this may
be necessary as
often as
once a week. Failure to do so will
affect the performance
of the shower, and
in extreme cases may cause the pressure
relief device
to operate.
Refer
to Section 6.
1.7 The shower heater outlet, hose
and handset act as a vent. They
must not be blocked, obstructed, or
have connected to them any fitting
not approved by us. The use of
unapproved accessories may invalidate the
guarantee and affect the performance and
safety
of the unit.
1.8 WARNING: DO NOT USE the shower
if the HOSE
IS DAMAGED in any way; for
instance if the outer covering has parted to
reveal the inner tube. A damaged hose can
suddenly restrict the flow and result
in
extremely hot water from the spray head.
A damaged hose could completely block
the outlet
of the shower; the resulting
increase
in pressure could burst a
weakened
or damaged hose.
1.9 Do not install the shower in a situation
where the water
in it could freeze. Any
damage caused
by freezing will not be
covered by the guarantee.
If you suspect your shower is
frozen, SWITCH OFF IMMEDIATELY.
Refer to Fault-Finding, Section Five.
1.10 Do not leave young children, the infirm
or the disabled unattended
in the shower.
1.11 Before stepping into the shower,
always test the temperature of
the spray
with your hand.
1.12 Switch off at the isolating switch
after use. This is a safety procedure
recommended with
ALL electric appliances.

1.13 As with all electrical appliances, it is
recommended to have your shower and
installation checked
at least every two years
by a competent electrician,
to ensure there
is no deterioration due to age and usage.
1.14 Shampoo and shower gel should be
stored using the gel hook and soap dish
(where provided) and
must not be
placed on top of the shower unit.
,.
How an instant electric
shower works
r 1.15 In an instant electric shower, an
electric element heats water AS IT PASSES
THROUGH. The temperature of the shower
is adjusted by controlling the rate at which
water flows over the heating element. This
is done using a flow control knob. There
is
no thermostat. If the temperature ofthe
incoming water varies (mains water can be
as low as 5° C
in the winter and as high as
20° C
in summer), the output temperature
will also
vary. The shower is only able to
RAISE the temperature of the water by a
given amount (depending upon the flow
rate).
Heat Source
Figure 1.15 Showing how the water is heated
as
it passes through.
EI

SECTION TWO
Siting and Plumbing
Spend some time planning exactly where to
site the shower heater and riser
rail.
Bear in mind the height ofpeople who will be
using
it.
Tools you may need:
Adjustable spanner giving at least 25 NF
Flat blade screwdriver with blade
width 5-6mm
No 2 Pozidriv screwdriver with a bit in
good condition
Sharp Stanley knife
Round file
Pipe cutters
Electric drill and 7mm dia
(N° 14)
masonry bit
Wire cutters
Electrician's insulation strippers
Other items you may need:
15mm compression elbow or straight
connector for connection
to the
shower unit
15mm isolating valve
Things you must do:
2.1 It is advisable to check that the water
pressure
to the shower is adequate. If in
doubt, consult a competent plumber.
Max: 10
bar.
Min: Up to and including 9.5kW: 0.9 bar.
Over 9.5kW: 1.1 bar.
The minimum figures are running
pressures with at least 5 I/min flowing.
The use
of other services connected to the
water pipe supplying the shower heater
may cause the water pressure
to drop
below the minimum.
II
Highest position
Shower
Heater
E
E
o
;;;
E
E
o
'"
'"
Lowest position
co
"E
E
Lowest possible ~ I
handset position _
Q ~r
Bath/shower tray
Figure 2.6 Siting of riser rail and heater
The following conversions may be useful:
1 bar 14.5 Ibflin2
= 33.3 ft head of water
10m head
of water.
1 Ibflin2 = 2.3 ft head.
2.2 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.
2.3 Mount the shower heater on a flat
vertical wall with the outlet,
to which the
hose
is connected, pointing downwards.
2.4 Ensure that the shower heater is not in
the direct spray of a normally parked
handset.
2.5 Allow room around the shower heater
for removal of the front cover.

I
2.6 Position the riser rail close to the
heater, not necessarily on the same wall
(but bear
in mind paragraph 2.4) so that, in
its highest parked position the handset is
no 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. 2.6).
2.7 Remember that if the handset can
reach
to within 25mm (1 ") of the spillover
level ofthe bath, shower tray, wash basin,
WC
or bidet, then to prevent the possibility
of back-siphonage of used water, (Water
'i'
Bye-Law 17) you must either:
(i) install a hose-restraining ring
Fig. 2.6).
(ii) fit a combined vacuum breaker-and-
check valve unit between
the hose
and shower heater.
(iii) fit a double-check valve in the
pipework to the shower.
2.8 Decide from which direction your pipe
Will enter the shower heater. There is a
choice
of top, bottom, rear or side. See
Section Four for details.
2.9 Ensure there are no services such as
gas, water pipes, electrical ortelephone
cables beneath the surface of the wall
before drilling. Special handheld testers are
available from hardware stores.
2.10 The water connection to the shower
heater should be made using standard
15mm outside diameter copper pipe or
Hacksaw
Figure 2.10
Figure 2.11
stainless steel The ends should be
cut square and be free from internal and
extemal burrs and deep scratches. Where
possible, use a pipecutter and not a saw,
to
prevent saw chippings entering the pipe.
2.11 Before making the final water
connections to the shower heater, the pipe-
work MUST BE FLUSHED THOROUGHLY
to remove brick dust, swarf etc. which
could severely damage
the showeritself
Fig. 2.11).
2.12 It is recommended that a Water
Research Council-listed servicing valve
is
fitted in the water supply pipe to the
shower. This
is to allow the shower heater
to be serviced without turning off the water
supply
to other appliances.
Things you must not do:
-. ...- ._ ..... ~
2.13 Do not use plumber's paste on any
jOints as this may damage the shower.
2.14 Do not use a blow-torch or other
form
of heat close to the shower heater as
this may damage the non-metallic parts.
2.15 Do not use excessive force, and do
ensure adequate support, when making
connections.
a

SECTION THREE
Electrical Installation
WARNING:
THIS APPLIANCE MUST BE EARTHED
The electrical installation should be carried
out
in accordance with the lEE Wiring
Regulations.
The following notes are for guidance only:
3.1 The shower heater must only be
connected
to a 230/240V ac supply. If you
are either:
a) installing a 10.8kW shower or
b) installing the shower in a rural location
it is a good idea
to advise the Regional
Electricity Company.
Please note that if a cable is operated at or
near its maximum rating for a given
installation method, it may feel very warm.
This
is normal and will not result in
deterioration of the cable insulation.
80 A or
Meter
~~~~~ 100A main
Is switch
~~=~~ Consumer
unit
Meter 'tails'
Figure 3.3 Schematic diagram of
straightforward installation circuit
Pull-cord
switch
Shower
Heater
3.2 Before making any electrical
connections within the installation,
make sure that no terminal is live.
If in doubt, switch offthe whole installation at
the consumer unit or switch fuse
(where fitted).
3.3 The shower heater must be connected
to its own independent electrical circuit. It
MUST NOT be connected to a ring main,
spur, socket outlet. or lighting circuit,
otherwise the circuit will overheat.
3.4 Checkthat your consumer unit (main
fuse box):
(i) has a main switch rating of 80A or
above and
(ii) has a spare fuse way which will take
the fuse/mcb you need to fit Figs.
3.9 and 3.10).
If so, you can wire the shower direct to the
spare fuseway of your consumer unit
(See.
Fig. 3.3). NB Not all consumer units accept
a
35/40/45A sized fuse.
3.5 If 3.4 (i) or (ii) are not so, the installation
is not straightforward, since it could involve
installing a
new consumer unit to serve the
whole house
or just the shower. You will
need
to call in your Regional Electricity
Company
to check the circuit and make the
connections
to the meter or service
connector block. They will also check the
bonding
of items in the bathroom.
3.6 All exposed metallic parts in the
bathroom must be bonded together using
cable
of at least 4mm2 CSA (cross sectional
area). These parts include metal baths,
radiators, water pipes (including the feed
to
the shower), taps and waste fittings.
3.7 For all installation arrangements work
back from the shower to the consumer unit.
Before making the final connections, check
the circuit for continuity and insulation
resistance.
3.8 It is recommended that a residual
current device (rcd), formerly known as an
earth leakage circuit breaker (elcb), with a
tripping current
of 30mA, is incorporated in

the circuit. This removes the need to check
your earth loop impedance.
3.9 A double-pole isolating switch, with a
contact separation of at least 3mm
in each
pole, must
be incorporated in the circuit.
This must have a mechanical indicator
showing when the switch is in the OFF
position. A neon lamp alone is not sufficient.
3.9 for minimum switch rating.)
If it is fitted in the bathroom it must be ofthe
cord-operated type.
It should be placed so
that it
is:
(i) Not possible to touch the switch body
when standing
in the bath or shower
cubicle.
(ii) Preferably outside the shower
enclosure.
(iii) Readily accessible (you should switch
off after using the shower).
3.10 Choosing cable and fuse sizes
Refer to 3.9 to determine the nominal
current of your shower.
The current rating of your cable must be at
least that of the shower itself. Then use
3.10 to choose a fuse
or mcb with a
rating less than that of your chosen cable.
We advise against using rewirable fuses.
If the cable is to be:
(i) bunched with others
(ii) in an ambient of above 40°C
(iii) in an insulating wall or within thermal
insulation, e.g. loft insulation
(iv) any other unusual situation
the current rating will be reduced.
IF IN DOUBT ALWAYS SEEK ADVICE
FROM A COMPETENT ELECTRICIAN.
Product Nominal Min Rating of Max Cable Length (based on 9.6V drop)
Rating
at Current at 240V
Isolating (metres)
240V(kW} (amps)
Switch at 240V
(amps)
4mm
2
Cabie 6mm'Cable 10mm
2
Cabie
7.2 30 30 29 43
I 72
8 33.5 35 26 39 65
8.5 35.5 40 24
37
61
8.7
36
40 24 36 60
9 37.5
40 N/A 35 58
9.5 39.5 40 N/A
33 55
9.8
41 45 N/A 32 53
10.8 I 45 45 N/A 29 48
Figure 3.9 Rating of showers, switch and maximum cable runs.
Note: In certain installations the combination
of low voltage and extended cable lengths may
result in lower flow rates.
PVC Twin and Earth Cable 4mm2
6mm' 10mm
2
Cable Installation Method
Current
Suitable:
Current
Suitable:
Current
Rating
Suitable:
Fuse
MCB
Rating Fuse
MCB
Rating Fuse
MCB
Direct in plaster or clipped to
vertical wall
In conduit ortrunking, within or
on the surface of a brick wall
36
30
30,35
30
30,32
30
46
38
40,45
35
40,45
30,32
63
52
45
40, 45
45,50
40,45,
50
Figure 3.10 Cable rating, and suitable cartridge fuses/mcb's (rewirable fuses are not recommended
and are
not covered by this table). NB Fuses with ratings above 45A are not generally available.
Values are in amps.
II

SECTION FOUR
Connecting the Shower
to Services
PREPARATION:
4.1 Remove the fixing screws which hold
the front cover to the backplate. Note that
the upper screws
are different from the
lower one.
4.2 Carefully remove the cover, which
holds both control knobs captive, by pulling
directly away from the backplate. Do not
twist, otherwise you may snap the fixing
lugs on the front cover.
Figure 4.2
4.3 Carefully take out the removable
bottom section of the backplate by lifting its
sockets clear
of the pegs on the backplate
Fig. 1.0). This section allows greater
access for installing the cable and pipe.
Keep it safe, as it could easily be damaged.
4.4 Decide which entry points you will use
for cable and water pipe (See
Fig. 4.8),
4.5 Decide where to mount the shower.
Refer to Section Two for guidance. Ensure
that you leave enough room around the
shower for removal of the front cover for
inspection or servicing at a later date.
4.6 It is best to mount the shower on top
of any tiling, so that it can be replaced
easily
in the future without requiring re-tiling.
If you must tile around the shower, DO NOT
grout right up
to the shower backplate as
this makes subsequent removal difficult.
Do not seal the shower
to the wall using
bath sealant, as the shower will not be
harmed
by water dripping behind it.
4.7 Remove the relevant areas of the
backplate, which are not knockouts, using
a sharp knife and/or a round file.
Cable and Pipe Entries:
Cable Entry
4.8 Available entry points: Top, bottom
and rear
(rear is generally the easiest). Side
entry
is not possible. The thinned areas in the
backplate and bottom section
are suitable for
a cable
size up to 16mm2•
For rear entry, cable must emerge from the
wall only
in the areas specified in 4.8.
You will need at least 280mm of cable to
emerge from the wall to allow connection to
the terminal block.