Ideal-Standard Ceratherm C100 A7537AA User manual

A7537AA Ceratherm 100 Exposed Thermostatic Bar
Shower Mixer – supplied with 600 shower kit
A7543AA Ceratherm C100 Exposed Thermostatic Bar
Shower Mixer – supplied over-head shower & handset kit
Ceratherm C100 Exposed
Thermostatic Bar Shower Mixers
INSTALLER: After installation please pass this instruction booklet to user
IMPORTANT
BEFORE CONNECTION, FLUSH WATER THROUGH PIPEWORK TO REMOVE
ALL DEBRIS ETC. WHICH COULD DAMAGE THE VALVE MECHANISM
INSTALLATION
INSTRUCTIONS

2
TABLE OF CONTENT
1 DIMENSIONS .............................................................................................. 3
2 PRODUCT BOX CONTENTS...................................................................... 4
3 INTRODUCTION ......................................................................................... 5
4 WATER SUPPLY CONDITIONS.................................................................. 6
5 WATER REGULATIONS .............................................................................. 7
6 PRE-INSTALLATION NOTES...................................................................... 8
7 INSTALLATION............................................................................................. 9
7.1 WALL MOUNT MIXERS A7537AA &A7543AA...................................................9
7.2 INSTALLATION OF SHOWER KIT FOR A7543AA.........................................12
8 OPERATING PRODUCT............................................................................ 16
9 TEMPERATURE ADJUSTMENT............................................................... 17
10 COMMISSIONING & PERIODIC CHECKS .............................................. 18
11 FREQUENCY OF REGULAR SERVICING .............................................. 18
12 COLD WATER ISOLATION (CWI) TEST .................................................. 19
13 MAINTENANCE NOTES............................................................................ 19
14 DISASSEMBLY SEQUENCE OF MAINTENANCE.................................. 20
15 DEMOUNTING THE MIXER FOR DISINFECTION ................................ 20
16 HANDLE REMOVAL FOR CARTRIDGE ACCESS .................................. 22
17 THERMOSTATIC CARTRIDGE REPLACEMENT ................................... 23
18 DIVERTER REPLACEMENT OF A7543AA .............................................. 23
19 FLOW CARTRIDGE REPLACEMENT A7537AA ..................................... 24
20 CHECK-VALVE REPLACEMENT.............................................................. 25
21 SPARE PARTS A7537AA ........................................................................... 26
22 SPART PARTS A7543AA............................................................................ 27
23 INLINE SERVICE VALVES ........................................................................ 28
24 CLEANING CHROME SURFACES........................................................... 28

42 x 26
L=1750
□110
540
150
313 101
80
31,5
G 1/2
□65
□300
1122
min. 700
79,5
74
381,5
□23 30 x 15
□50
2°
L=1750
180
58
3
Basic shower valve
dimensions shown with
mounting
brackets assembled
Shower kit & overhead
shower supplied with
A7543AA
600 Shower kit supplied
with A7537AA
1 DIMENSIONS

NOTE: This wall mount kit is supplied with both products
Wall mounting bracket
assemblies -pair
Fibre washer seals with
integral strainers, -pair
A7537AA Shower valve
without mounting brackets
A7543AA WBWS Shower kit
includes: 1100 overhead riser
rail, a mounting bracket,
sliding bracket for rail,
300 square overhead shower plate,
1750 shower hose &
slim shower hand set. A7543AA Shower valve
without mounting brackets
A7537AA 600 Shower kit
includes: 600 riser rail,
a pair of mounting brackets,
sliding bracket for rail,
1750 shower hose &
shower hand set.
Wall marking
template
4
2 PRODUCT BOX CONTENTS
NOTE: Shower kits have to be carefully assembled during installation, chrome parts are packaged
individually to prevent damage.
The shower kit for A7537AA is supplied with a separate tting instruction.

5
3 INTRODUCTION
The ttings covered by these instructions should be installed in accord-
ance with the Water Regulations published in 1999*.
Ideal Standard strongly recommends that these ttings are installed by
a professional tter.
*A guide to the Water Supply (Water Fittings) Regulations 1999 and the Water Byelaws 2000, Scotland is published
by WRAS (Water Regulations Advisory Scheme) Unit 13, Willow Road, Pen-y-Fan Industrial Estate, Crumlin, Gwent,
NP11 4EG. ISBN 0-9539708-0-9
WATER REGULATIONS
Hot and cold water supply pressures must be reasonably balanced and from a common source - both
from storage or both from a supply pipe. (IRN 101). The mixers will function within specication on
unequal pressures up to a ratio of 5 : 1, but it is not recommended that the cold supply be connected
to the rising main and hot to the tank fed supply as the pressure di󰀨erential is likely to exceed the 5:1
ratio. (See table 1) The minimum pressure for correct operation is 1.0 bar. Pressure head is measured
as the vertical distance between the bottom of the cold water storage tank which feeds the hot water
system and the highest point on the shower spray plate. When installing with a shower pump the use of
a secondary tapping from the cylinder is highly recommended.
The picture below shows the various methods of connecting the hot water pipe to the cylinder - the most
preferred on the left and the least preferred on the right.
The tting should be so installed as to be readily accessible for examination, repair, replacement or
operation. (IRN 111).
The temperature of the hot water must not exceed 85ºC but the installer’s attention is drawn to code
of practice BS 6700 which recommends that stored hot water should normally never exceed 65ºC. For
correct operation of the valve, a minimum of 55ºC is required.
most preferred solution least preferred solution
Essex flange 22mm Surrey flange
22mm outlet
From vertical
expansion pipe
22mm pipework
Preferred arrangements for cylinder tapping
From underside of
expansion pipe off-set
at 60º 22mm pipework
Note: If water supply is fed by gravity then supply pressures should be veried to ensure the
conditions of use are appropriate for the valve.

Table 1 Conditions of use
6
MODULATING COMBI BOILER
This thermostatic bath shower mixer is designed for use with modulating
combination boilers.
When installing on a modulating combination boiler it is sometimes
possible for the interaction of a thermostatic valve with the combi to
cause the boiler to cut out and cut in again, with the result that the
water will become alternatively cold and hot. To overcome this, a 4 L/min
ow regulator should be tted upstream of the thermostatic valve.
It should be tted in any 15mm compression tting in the dedicated cold supply pipe.
It is important to choose a compression tting located in a position which is accessible after installation
and it must be tted the correct way round for the direction of ow. The regulator can be tted in either
the inlet or outlet side of the compression tting. If tting in an outlet side, ensure the o-ring is seated
fully in the visible rebate around the edge of the regulator. Use the tip of a small screwdriver or similar
to achieve this. Ensure the tail of the pipe is not fouling the regulator (shorten if required) and do up
the compression tting as normal. In a minority of cases, where the boiler is of a type which stores a
small quantity of very hot water, it may also be necessary to t a 4 l/min ow regulator in the hot supply.
flow direction
through
flow regulator
• A pair of service valves (for isolating both water supplies) MUST be tted below the bath to permit
future maintenance of this product, see sect 23. These should be tted as close as practicable to
the water supply inlets of the mixer & in an easily accessible location.
• The mixers include mesh lters (strainer-washers) and check valves are tted inside the inlets of
these products, see section 20.
These regulators, spares code A962570NU, can be obtained by contacting
Ideal Standard Customer Care or www.idealstandard.co.uk
4 WATER SUPPLY CONDITIONS
BSEN1111
Operating pressure range: High Pressure
Maximum static pressure 10 bar
Flow pressure hot and cold 1.0 to 5.0 bar
Hot supply temperature 55 to 65 °C
Cold supply temperature 5 to 20 °C max
Introduction
These thermostatic shower mixers are manufactured to the highest standards. The mixer is intended to
be installed on high pressure systems (1.0 bar or greater). The mixer has safety features such as cool
body technolgy and temperature limit stop. To make installation easier, fast x wall mounts are supplied.
Ø15mm water supply pipes should be installed at 150mm horizontal centres in the wall, behind a shower
panel or tiled duct wall.
Excessive owrate
To remedy an excessive owrate issue, where the above inlet regulators have not been tted, we
recommend the use of a “shower outlet ow regulator”. This is suitable for installations which exceed 2
bar dynamic pressure.
A 9 litres per minute outlet regulator is available, quote spares code L6749AA.
This regulator can be easily tted between the shower valve outlet and the shower hose

7
7
CATEGORIES OF RISK
The water regulations published in 1999* take a new approach to backow in that they look at di󰀨erent
categories of risk. The installer must assess the risk from the various categories of uid in adjacent
appliances before determining the level of backow protection required for a particular installation.
Figures 3 & 4 describe the protection required in various installations.
CATEGORY 3 RISK
Water in a shower tray, basin or bathtub is considered to be a uid category 3 risk which is a uid
which represents a slight health hazard if it were to nd it’s way back into the supply pipe. For this
reason it must not be possible for any exible shower head to be able to enter any adjacent washba-
sin, bath or shower tray unless appropriate protection is employed. (See Figure 3). If it is desired to
allow the hand spray to be used inside say a bathtub or a basin it is essential that double check valves
be tted to the inlet on both hot and cold supplies to the thermostatic valve. Alternatively single check
5 WATER REGULATIONS
zone of backflow
risk for longer
hose
spill
over
level
bath or shower tray
25mm minimum air gap
required if check valves are
not fitted
spill over
level
washbasin
zone of
backflow risk
for shorter
hose
no additional
backflow protection
required
cold and hot water supplies
to shower valve will need
additional check valves on each
service if longer hose is fitted
zone of backflow risk
for restrained hose
which is longer than
system design hose
- not permitted -
zone of backflow
risk for unrestrained
hose
zone of backflow risk
for restrained hose
w.c.
spill-over
level
shower tray
or bath tub
bidet
w.c.
spill-over
level
restrained hose giving
the 25 mm air gap is
permitted
25mm
minimum
unrestrained
hose would
not be
permitted
valves can be tted at the inlets and an
additional check valve should be tted
in the valve outlet.
No check valves need be tted if the
hand spray is prevented from reaching
closer than 25mm of the spill over level
of any such xture.
CATEGORY 5 RISK
Water in a Sink, WC or Bidet is con-
sidered to be a uid category 5 risk
which is a uid which represents a
serious health hazard if it were to nd
it’s way back into the supply pipe. For
this reason it must not be possible for
any exible shower head to be able to
enter any adjacent Sink, WC or Bidet. If
the exible hose to be tted could reach
into any such vessel, the requirements
to the system design are so onerous it
is better not to t a exible. Rather, a
xed overhead showerhead should be
considered. (See Figure 4).
It will also be seen that this risk could
change should the hose be taken out
of the restraining device or should a
longer replacement hose be tted at a
later date. Installers and householders
are advised to take account of these
factors when tting replacement hoses.
For pumped applications the pipe
supplying the pump must not in addition
supply an ascending spray bidet.
Fig. 3 Backow risk from a uid category 3
Fig. 4 Backow risk from a uid category 5

The thermostatic mixing valve must be installed in such a position that maintenance of the
TMV, its valves and the commissioning and testing of the TMV can be undertaken.
Ceratherm C100 is an exposed two hole thermostatically controlled shower mixer. This
product is designed to provide water from ambient cold up to a safe maximum temperature for bathing.
Mounting. Product are supplied with a pair of wall mount escutcheons. Mixer is intended to be installed
on a wall or panel arrangement.
Flow regulation. There are no ow regulators tted inside these products.
Mesh lters (strainers) integral to the inlet seals are intended to protect the check valves from water
borne debris. These are tted inside the inlets of the product, see section 20.
Thermostatic cartridge. Additional mesh lters (strainers) are tted to the thermostatic cartridge to
protect it from water borne debris, see section 17.
Product dimensions. Check the dimensions shown in section 1, ensuring the mixer will t on the
intended bath. Plan position of proposed shower kit.
Product box contents. Ensure you have all the parts shown in section 2.
Service Valves. A pair of service valves (for isolating both water supplies) MUST be tted to permit
future maintenance of this product. These should be tted as close as practicable to the water supply
inlets of the mixer & in an easily accessible location. NOTE: service valves are not supplied with thiese
products, see section 23.
Shower Kit. Each product is supplied with its own style of shower kit. The exible shower hose from the
shower kit can be screwed onto the G1/2” shower outlet nipple located on the underside of the mixer
body. Ensure adequate steps are taken to secure the shower hand set and the arrangements comply
with water regulations.
Shower hose retainer. Both products are supplied with a bracket to restrain the exible shower hose
& prevent the hand shower head from falling into appliances such as the bath tub or shower tray. The
hose can be restrained by a bracket on the shower riser rail or separate wall bracket.
Mixer Controls. The mixers have dual control handles, the left handle allows temperature adjustment
of the water. For A7537AA, the right handle permits ow control of the mixed water. For A7543AA, the
right handle divertes water between the overhead shower & the shower hand set.
Water Supply Pipes. Both hot & cold water supply pipes should be securely attached to a wall using
suitable xing clips. Supply pipes must Ø15 to t inside the wall mount brackets.
6 PRE-INSTALLATION NOTES
8
DO NOT apply heat near this product. Heat generated
by soldering could damage plastic parts and seals
IMPORTANT: Ensure that any old / existing thermostatic mixing
valves (TMVs) that may be tted in the supply pipes are removed

9
7 INSTALLATION
IMPORTANT
BEFORE CONNECTION, FLUSH WATER
THROUGH PIPEWORK TO REMOVE
ALL DEBRIS ETC. WHICH COULD DAM-
AGE THE VALVE MECHANISM
Pair of wall brackets
with connectors &
escutcheons
Template x1
150
Ø15mm copper supply pipes should be run within the wall cavity.
Hot supply pipe should be on the left hand side and the cold on the right.
Ensure that the hot and cold pipes are positioned 150mm apart and are level.
Use the template provided to obtain the correct spacing.
1
Pipework should be supported in the cavity
We recommend leaving 50mm of pipe protruding at this stage.
50
WALL MOUNTING
BRACKETS
7.1 Wall mount mixers
A7537AA &A7543AA

Place the brackets over the exposed
pipes and use the template provided to
position them 150mm apart.
Mark the hole positions for the xings
onto the mounting surface.
Ensure that the positions of the holes
will not result in damage to the pipework
inside the wall cavity during drilling.
Drill holes appropriate for your choice of
xings into the wall.
We recommend a minimum of two xings
per bracket diametrically opposed.
Drill carefully to avoid damaging conce-
aled pipework.
10 MIN
20 MAX
With the wall brackets in position, the
supply pipes should be trimmed as
shown. The pipes should project from
the front face of the brackets by bet-
ween 10 to 20mm.
If using a pipe cutter,
it may be necessary to
mark the pipes & then
remove the brackets
before trimming the pipes
to their correct length.
4
5
3
2
Apply a smear of silicone sealant to
the rear of the assembled brackets and
push them over the pipework.
Screw both brackets to the wall.
The template can be used to check that
the correct pipe spacing of 150mm has
been maintained.
Clean o󰀨 excess sealant and ush the
pipes to remove any trapped debris.
10

30
23
Slide the olives onto the pipes. Screw the
two connectors onto the wall brackets by
hand until they stop against the olives.
Use a 23mm A/F spanner (or adjustable)
on the connectors to tighten.
The connectors will have to be securely
tightened to form the necessary compres-
sion joint between the olive, wall bracket
& connector.
Fit the O-rings into both escutcheons as
shown. Slide the escutchens onto the
mixer’s inlets right upto the rear face of
the mixer.
Fit the washer seals (with integral strai-
ners) into both inlet bores, ensuring the
domed area of the strainer is pointing
outwards (not into the mixer).
Align the mixer’s inlets legs with the
wall brackets & start screwing the
coupling nuts onto the threads. Screw
a couple of threads of each nut & then
alternate to ensure mixer remains
parallel to the wall.
O-rings can be wetted with
water to help them slide.
Fit the O-rings provided into
the grooves of the escutcheon
Tighten the coupling nuts as far as
possible by hand & then use a 30mm
spanner to just put enough squeeze on
the washers to make a good seal.
Turn on the water supplies, ensure that there are no leaks.
The mixer installation is complete
The shower kits are supplied with their own tting instructions,
next step is to position & install the appropriate shower kit.
8
9
6
7
Slide the escutcheons along the inlet
legs until they are pressed against the
wall. If necessary, rotate the escut-
cheons to ensure they look parallel with
the mixer body.
The hose from the shower kit should be
connected to the shower outlet located
on the underside mixer body. Ensure
hose seal is in place.
11
NOTE FOR IRELAND: 15mm olives are
supplied with this product. Use 1/2”
olives if 1/2” supply pipes are tted.
Fit seals

2,5
1
2
4
3
min. 700
7.2 Installation of Shower kit for A7543AA
Once the shower valve has been securely tted, work can commence on the installing the shower kit.
Start by assembling the shower rail parts together:
1. Slide the wall xing bracket onto the shower
riser rail, orientated as shown. Next slide the
handset bracket onto the riser rail also orienta-
ted as shown. Ensure this bracket is “unlocked”,
rotate the knob to check.
The wall xing bracket should be posi-
tioned vertically at lease 700mm away
from the shower valve, as shown here in
this example:
With the wall bracket positioned correctly:
2. Using a 2.5mm hexagonal key, tighten
the two grub screws visible from the rear
of the wall bracket. This will secure the
wall bracket to the riser rail
3. This assembly of the shower rail
parts together, can now be located
onto the nipple on the top surface
of the shower valve as shown. Be
careful to hold this assembly in place,
otherwise it will topple over & get
damaged.
Take care not to damage the O-ring
tted to the nipple during assembly.
4. Use a spirit level to ensure the
shower riser rail is vertical.
Note: the mixer supplied with A7543AA is tted with
an additional outlet nipple on the top surface to
connect the over head shower plate.
Smear a small amount of approved silicone grease
onto the O-ring tted on the nipple. This will help to
prevent damage to the O-ring during assembly.
Use a WRAS approved silicone grease
(eg: Klueber Unisilkon L250L).
12

5
6
8
7
Ø 6
5. Once the riser rail is correctly positioned & is vertical, draw a
line around the perimeter of the bracket onto the wall surface.
Lift the shower rail assembly o󰀨 the nipple on the shower valve
& place it safely to one side.
6. Place the inner circular part of the wall bracket onto the
drawn square on the wall. Place it centrally within the square &
orientate it as shown. Mark the two slot positions on the wall.
7. Drill two 6mm holes into the wall at the centre of the marked slots.
8. Tap two wall plugs into the two drilled holes. Using a “posi” screw driver, & the two screws provided,
securely x the circular bracket to the wall.
IMPORTANT NOTE: The wall plugs & screws provided are intended for a solid wall. Check & ensure
these plugs & screws are suitable for the type of installation wall. Otherwise purchase & use wall
xings appropriate to the wall type.
13

9
2,5
2,5
10
10 11
min.
10 Nm
9. Ret the shower rail assembly back onto the nipple on
the shower valve. Align the bracket on shower rail to the
circular bracket tted to the wall. Press rmly to ensure the
bracket on the shower rail makes contact with the wall.
Using a 2.5mm hexagonal key, tighten the grub screw on
the top of the bracket to secure the riser rail assembly at
the top.
10. One side of the exible shower hose can be
screwed onto the outlet nipple on the underside of
the shower valve. The other side can be screwed
onto the shower handset.
The exible shower hose has integral seals at both
ends.
The shower handset can be parked in the bracket
using the conical portion of the shower hose, as
shown.
The shower parking bracket height can be adjusted:
• Use the knob to unlock the bracket from the riser
rail.
• Slide the bracket up & down along the riser rail to
the desired position, then relock it with the knob.
At the bottom of the riser rail, tighten
a second grub screw into the nipple
(that was on top of the shower valve).
11. Finally, the overhead shower plate can
be screwed onto the end of the shower rail.
Observe the 10Nm torque shown, but do
not use excessive force.
Operate the tting, check all joints for leaks.
Rotate the diverter handle & check both
shower outlets.
14

Wall bracket
Drill 2 holes for wall bracket
Ø4mm
Anti
Rotation
Hole
11mm CRS
Ø8mm
Fixing
Hole
Ø6mm
Fixing
Hole
4a
4b
Product A7543AA includes a small “shower hose” retaining bracket, which should be tted to ensure
the installation complies with water regulations, see section 5 for more details.
Select a suitable location on the wall that will prevent the exible
shower handset from entering any adjacent appliances, such as
sink, washbasin, toilet, bath, bidet, or shower tray.
The two-piece bracket comprises of the wall bracket which is xed
to the wall & a snap on cover, which conceals the wall bracket.
2. Tap a wall plug into
the Ø6mm drilled hole.
3. Using a “posi” screw
driver, & the screw pro-
vided, securely x the
bracket to the wall.
5. Example of
a completed
installation.
4a. Ensure the shower hose is
trapped between the two parts
of the bracket as shown.
4b. Slide the cover downwards
onto the wall bracket until it
snaps into position.
Note: This bracket has robust
design, but is likely to break if
becomes necessary to remove
the shower hose in the future.
A new bracket should be tted
if the shower hose is replaced.
IMPORTANT NOTE: The wall plug & screw provided are intended for a solid wall. Check & ensure
this plug & screw are suitable for the type of installation wall. Otherwise purchase & use wall xings
appropriate to the wall type.
Wall bracket for Category-5 shower hose retaining applications
15

8 OPERATING PRODUCT
16
Left handle controls water temperature
• This handle is shown above parked in the 40°C temperature “stop” position.
• At this temperature “stop” position mixed water is delivered up-to about 40°C.
• To obtain cooler water rotate handle downwards from the parked position.
• To obtain higher water temperature, press the left button (& hold) & then rotate this handle upwards
from the parked position.
Right handle controls water ow rate & outlet device
• This handle is shown above parked in the o󰀨 position (giving no ow at this position).
• Rotating this handle downwards from the parked position commences water ow. By rotating the
handle 90° from the o󰀨 position the user will encounter economy ow “stop” delivering about 50% of
the maximum ow rate achievable through this product.
• To obtain greater ow rate, press (& hold) the right button & rotate this handle further downwards.
The handle will rotate a further 90° from the economy stop to the maximum ow.
• This product has one outlet at the bottom of the mixer so water will be discharged to the shower
handset.
REMEMBER, BE CAREFUL: TEMPERATURES HIGHER THAN 40°C CAN BE HARMFUL.
+
+
Q=0%
Shower mixer handle controls
Q= flow rate
Q=50% Q=100%
=40°C
>40°C
Q=100%
ATTENTION: TEMPERATURES HIGHER THAN
40°C CAN BE HARMFUL TO YOUR HEALTH.

DO NOT FORCE HANDLES BEYOND THE DESCRIBED MOVEMENT RANGE OTHERWISE THIS
MAY RESULT IN DAMAGE TO BOTH VALVES AND HANDLES.
17
Right handle controls the 3 function diverter (for product A7543AA only):
• This handle is shown above parked in the o󰀨 position (giving no ow at this position).
• Rotating this handle downwards from the parked position, commences water ow & will direct water
to the bottom outlet of the mixer. Thus activating the shower hand set only.
• By rotating the handle 45° from the o󰀨 position the user will encounter economy ow “stop” delivering
about 50% of the maximum ow rate achievable through this product.
• To obtain greater ow rate, press (& hold) the right button & rotate this handle further downwards.
The handle will rotate further to the maximum ow stop.
• Rotating this handle upwards from the parked position, commences water ow & will direct water to
the top outlet. This will activate the large overhead shower plate.
• At each position the user can feel a soft click to indicate position. Total handle rotation is about 180°.
• The diverter permits one outlet to be opened at any one time, simultaneously closing the second
outlet.
+
Q=0%
Q=50%
Q=100%
9 TEMPERATURE ADJUSTMENT
T
If the mixer is not discharching
40°C water when the tempera-
ture handle is parked & aligned
with the body, then (if desired)
this can be adjusted as follows:
1. First remove the temperature control handle (left side) as detailed in section 16, steps 1 to 3.
2. Turn on the shower, position a thermometer in the running water & when the temperature settles
rotate the drive bush on the spindle of the thermostat until 40°C is achieved.
3. Without disturbing the drive bush position, ret the handle.
40°C

18
The following procedures should be carried out after installation and every 12 months after to ensure
that the valve is functioning correctly.
Check that:
1. The application of the thermostatic valve matches the approved designation.
2. The supply pressures are within the recommended range for the application.
3. The supply temperatures are within the permitted range for the application and comply with the
guidance for prevention of Legionella.
4. The mixed temperature is as required for the application.
Record:
5. Each hot and cold supply. (Make a note of the measuring device used).
6. The mixed water temperature at the outlet device.
Isolate:
7. The cold supply to the mixing valve and record the mixed water temperature after about 5 seconds.
The temperature should not exceed the value given in table (2) below.
The purpose of servicing regularly is to monitor the performance of changes in system and valve set
up. This may require the need to adjust either the supply system or the valve. The product should be
checked and tested 12 months after commissioning.
Firstly measure the water temperature at one of the outlets (bath ll or shower).
Carry out the cold water supply isolation test by isolating the cold water supply to the TMV, wait for 5 sec-
onds if water is still owing check that the temperature is below 45°C. If there is no signicant change
to the set outlet temperature (+/-2ºC or less change from the original settings) and the fail-safe shut o󰀨
is functioning, then the valve is working correctly and no further service work is required.
Notes:
A residual ow is permitted during the commissioning or the annual verication (cold water supply
isolation test), then this is acceptable providing the water temperature is no more than 2ºC above the
designated outlet temperature.
Temperature readings should be taken at the normal ow rate after allowing for the system to stabilize.
The sensing part of the thermometer probe must be fully submerged in the water that is to be tested.
Any TMV that has been adjusted or serviced must be re-commissioned and retested in accordance with
the instructions detailed above.
Note: 46°C is the maximum mixed water temperature from a bath tap. The maximum temperature
takes account of the allowable temperature tolerances inherent thermostatic mixing valves and tem-
perature loss in metal baths. It is not a safe bathing temperature for adults and children.
The British Burns Association recommends 37°C-37.5°C as a comfortable bathing temperature for Children.
In premises covered by the Care Standards Act 2000, the maximum mixed water temperature is 43°C
Table 2 A guide to maximum temperature sets
Application Mixed water temperature Permitted maximum temperature
rise during site testing
Shower 41°C 43°C
10 COMMISSIONING & PERIODIC CHECKS
11 FREQUENCY OF REGULAR SERVICING

19
12 COLD WATER ISOLATION (CWI) TEST
13 MAINTENANCE NOTES
CWI test is a guide to showing the performance of the thermostat.
Prior to CWI test:
• Make sure that the temperature handle is aligned in the 40°C position.
• Make sure the supply temperatures are within the ranges 55 to 65°C for hot, & 5 to 20°C for cold.
• Unscrew the shower hand set from the exible hose, & direct the water to be discharged into a
suitable vessel.
To perform a CWI test:
• Turn the product on using the ow handle, override the 50% economy ow stop on the handle & rotate
handle to max, giving 100% ow.
• The temperature handle button should be positioned at the 40°C nominal stop (parked).
1. Record the steady state temperature of both hot and cold water supplies. Note the Δt.
2. Record the temperature of the mixed water at the outlet, should be within range 40±1°C.
3. Isolate the cold water supply. If the ow ceases, CWI test passed. An ongoing reduced ne ow
of water (pencil stream) from the mixed water outlet is also acceptable as a pass.
Restore the cold supply & recheck the temperature at the mixed water outlet once stabilised.
If the ow has not reduced, the product has failed the CWI test. Product requires maintenance,
cartridge should be removed, cleaned & retested. See guidance below.
Additionally, clean all lters, ensure check valves are working, and make sure all isolating valves
are fully open. Ret the shower handset to the exible hose upon completion of the test.
NOTE: In order to isolate the cold water & to perform the CWI test, service valves must be tted (as
close as practicable to the mixer’s inlets).
Volumetric guidance in the case of “ongoing reduced discharge of water” during CWI test
Acceptance criteria is as follows, isolate the cold water supply then:
1) Collect the water discharged from the shower outlet for 5 seconds.
2) Continue to collect the water discharged from the shower outlet in a second vessel for a further
period of 30 seconds.
The volume collected in the rst period of 5 s shall not exceed 200 ml.
The volume collected in the second period of 30 s shall not exceed an additional 300 ml.
After restoration of the cold water supply (30 s) the mixed water outlet temperature shall not di󰀨er by
more than 2°C from the initial set mixed water temperature.
The tting of isolation valves and strainers is required as close as is practicable to the water supply inlets
of the thermostatic valve. The thermostatic cartridge seldom fails and the possibility of blocked lters
should be investigated before contemplating replacing it. Small particles of debris may still nd their way
past the strainers and onto the lter screens on the thermostatic cartridge. These should be cleaned and
re-tted. See section cartridge replacement.

20
14 DISASSEMBLY SEQUENCE OF MAINTENANCE
15 DEMOUNTING THE MIXER FOR DISINFECTION
9.1 THERMOSTATIC CARTRIDGE AGEING
Following many years of normal service you may notice the following:
1. The need to carry out more frequent adjustment of mixed temperature.
2. The thermostatic element may not pass the CWI test.
These issues could be due to the ageing of the thermostat which loses some expansion capability over
time.
These are the principle objectives of testing, as they serve to indicate to maintenance sta󰀨 the declining
performance capability of the thermostatic cartridge.
For this reason the audit testing ow chart highlights that 2nd Instance CWI test failure or 2nd instance
mixed deviation even with stable ‘as commissioned’ supply conditions and correct inlet supply Δt’s, is
potentially the rst indication of the need to replace the cartridge.
Disassembling sequence to access cartridges & demount the mixer:
1. Isolate both HOT & COLD water supplies rst. Use inline service valves if tted.
2. Fully open the ow or diverter handle, to conrm water is switched o󰀨. Unscrew
the shower hose from the underside of the mixer. This will permit some of the
trapped water to drain down & release water pressure from the outlet.
3. To access cartridges, it will be necessary to remove handles rst.
See section 16.
4. Ensure parts are re-assembled in the correct ‘reverse’ sequence.
5. Restore both water supplies. Ret the shower hose.
6. Check all joints for leaks upon completion.
7. Run water through the mixer for a few seconds to purge-out any trapped air.
In response to the new requirements of HTM 04-01 Addendum, the design of this
product permits easy demounting of the mixer from the inlets.
This design permits quick & easy removal of the mixer for cleaning, disinfection and
maintenance purposes.
General advice:
1. Use correct size tools. Avoid damaging chromed surfaces, use a strap wrench if possible.
2. When unscrewing cartridges or demounting the mixer, expect some trapped water to escape from
within the mixer body.
3. Wash all parts (strainer meshes etc.…) in clean water before re-assembly.
4. Observe torque settings, where specied.