Bristan DUL3 THBSM C User manual

Please keep this booklet for future
reference.
Installer, when you have read these
instructions please ensure you leave them
with the user.
Installation Instructions
Thermostatic Bath
Shower Mixer
Models covered:
DUL3 THBSM C, AS2 THBSM C

2
Contents
Thank you for choosing Bristan, the UK’s leading taps and showers expert.
We have designed this product with your enjoyment in mind. To ensure that it works
to its full potential, it needs to be fitted correctly. These fitting instructions have been
created to give you all of the information you need and, if you need any further help,
please do not hesitate to contact us.
Important Safety Information................................................... 3
General Information ................................................................. 4
Specifications ........................................................................... 5
Dimensions............................................................................... 6
Installation Requirements ....................................................... 7
Prior to Installation .................................................................. 8
Installation................................................................................ 9
Temperature Setting ................................................................ 10
Commissioning......................................................................... 11
Maintenance ............................................................................. 12-13
Troubleshooting........................................................................ 14-15
Notes......................................................................................... 16-17
Guarantee ................................................................................. 18-19
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.

3
Important Safety Information
•Please read these instructions thoroughly and retain for future use.
•All products manufactured and supplied by Bristan are safe provided they are
installed, used correctly and receive regular maintenance in accordance with these
instructions.
•If you are in any doubt about your ability to install this product safely you must
employ the services of an experienced qualified plumber.
•This product needs to be installed in accordance with, and meet the requirements of
the Water Supply (Water Fittings) Regulations 1999 and Scottish Byelaws 2004.
•Remove all packaging and check the fitting for damage before starting installation.
•Warning: Before starting any installation please consider the following: before
drilling into walls, check that there are no hidden electrical wires, cables or water
supply pipes. This can be checked with the aid of an electronic detector.
•If power tools are used do not forget to: - Wear eye protection
- Unplug equipment after use
•Important: Remember to turn off the mains water supply before connecting to any
existing pipe work. Fitting isolating valves to the inlet feeds is recommended for ease
of maintenance.
•Warning: Before installing this product it is essential that you thoroughly flush
through the pipework in order to remove any remaining swarf, solder, etc.
Failure to carry out this procedure could cause problems or damage to the workings of
the tap.
• This product must not be modified in any way as this will invalidate the guarantee.
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.

4
General Information
This product has been tested to the Water Regulations Advisory Scheme (WRAS) and
satisfies the requirements of the Water Supply (Water Fittings) Regulations 1999 and
current bylaws. For full Installation Requirements & Notes (IRN) please visit
www.wras.co.uk/directory.
This product has been designed and tested to comply with BS EN1287:1999 (LP)
and BS EN 1111:1999 (HP) Thermostatic Mixing Valves Standards.
BS 8558 recommends hot water should be stored and distributed at a temperature of
not less than 60ºC which will help minimise the build-up of lime scale in hard water
areas.
If installing this product on a low pressure (tank fed) system please see
specificationstable on page 5 to determine the minimum distance required from
undeside of the cold water tank to the outlet.
These Thermostatic Mixing Valves should be installed in compliance with the Water
Regulations. Where the supplies are unbalanced, i.e. Hot water from cylinder tank / cold
from the mains, approved check valves must be fitted in the supply pipes.
If in doubt, contact a registered Plumber or your Local Water Authority or the Secretary
of The Institute of Plumbing, address as follows:
The Institute Of Plumbing
64 Station Lane,
Hornchurch
RM12 6NB
Phone: [phone]
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.

5
Specifications
Product Code
Working pressure
Inlet
Minimum
distance from
cold water tank to
outlet (metres)
Min Max
DUL3 THBSM C 0.5 5.0 3/4" BSP Threaded Tail 5
AS2 THBSM C 0.5 5.0 3/4" BSP Threaded Tail 5
Maximum static pressure- 10.0 bar
Maximum outlet temperature- factory preset to 38ºC
System Requirements:
Gravity fed hot & cold (Equal pressures)
Gravity fed hot & cold (Differential pressure, maximum ratio 5:1)
Unvented systems
Instantaneous water heater (Combination boiler)
Pumped Systems
Note: When using a Pumped System, we recommend that an Essex Flange is used.
Supply Requirements:
Minimum cold water supply temperature: 5ºC
Maximum cold water supply temperature: 25ºC
Maximum hot water supply temperature: 80ºC
(a maximum hot water supply of 60-65ºC is
recommended for ablutionary purposes).
Note: The inlet hot water temperature must be at least 10ºC above the required blend
temperature (e.g. outlet temperature 43ºC: Minimum hot supply 53ºC).
Nominally equal (balanced) inlet supply pressures are recommended for optimum
performance. If pressures are unequal, then a pressure reducing valve should be
used.
Valves Operating outside of these conditions of use cannot be guaranteed as type 2 valves.
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.

6
Dimensions
Dimensions are approximate and in millimetres.
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
Design Utility Lever Thermostatic Bath Shower Mixer
Assure Thermostatic Bath Shower Mixer Chrome
143
78
45
32
256
180
G 3/4
143
32
45
78
180
256
G 3/4

7
Installation Requirments
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
Conditions of use for Type 2 (Thermostatic mixer) valves
High Pressure Low Pressure
Maximum Static Pressure (Bar) 10 10
Flow Pressure, Hot & Cold (Bar) 0.5 to 5 0.1 to 1.0
Hot Supply Temperature (ºC) 55 to 65 55 to 65
Cold Supply Temperature (ºC) Equal to or less than 25 Equal to or less than 25
Note: Valves operating outside these condi-
tions cannot be guaranteed by the Scheme to
operate as Type 2 valves.
If a water supply is fed by gravity then the
supply pressure should be verified to ensure
the conditions of use are appropriate for the
valve.
Recommended Outlet temperatures
The BuildCert TMV scheme recommends the
following set maximum mixed water outlet
temperatures for use in all premises:
41ºC for showers;
The mixed water temperatures must never
exceed 46ºC.
The maximum mixed water temperature can
be 2ºC above the recommended maximum
set outlet temperatures.
Note: 46ºC is the maximum mixed water
temperature from the bath tap. The maxi-
mum temperature takes account of the al-
lowable temperature tolerances inherent in
thermostatic mixing valves and temperature
losses in metal baths.
Warning: It is not a safe bathing
temperature for adults or children.
The British Burns Association recommends 37
to 37.5ºC as a comfortable bathing tempera-
ture for children. In premises covered by the
Care Standards Act 2000, the maximum mixed
water outlet temperature is 43ºC.
The thermostatic mixing valve (TMV) will be in-
stalled in such a position that maintenance of
the TMV and its valves and the commissioning
and testing of the TMV can be undertaken.
The fitting of isolation valves is required as
close as is practical to the water supply inlets
of the thermostatic mixing valve.
The fitting of strainers is recommended as
close as is practical to the water supply inlets
of the thermostatic mixing valve

8
Prior to Installation
Identify all components prior to stating installation.
1. Mixer Body x1 4. Washers x2
2. Pillar Legs x2 5. Back Nuts x2
3. Base Washers x2 6. Filter Washers x2
This mixing valve should be installed in compliance with current water regulations.
For further details contact your Local Water Authority.
This mixing valve is suitable for the following systems:
Gravity Fed Hot & Cold (Equal Pressures)
Unvented Systems
Gas Combination Boiler
Pumped System (Equal Pressures)
Note: On gravity systems the minimum distance from the underside of the water tank /
cylinder to the mixing valve must be at least 5 metres.
Before connecting the mixing valve, thoroughly flush through the water supply pipes to
remove any remaining swarf, debris. Failure to do so may result in damaging the product.
Base Washer
Washer
Backnut
Pillar Legs
Mixer
Body
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.

9
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
1. Place filter washers into the pillars and
screw the pillar legs onto the mixer body.
2. Place the mixer body onto the bath
ensuring the base washers are fitted to
the threaded legs of the pillars.
3. Push the washers onto the threaded
pillar legs and screw the backnuts onto
the threaded pillar legs and tighten fully
against the underside of the bath.
4. Connect the hot and cold water
supplies to the pillar legs ensuring the
hot supply on the left and the cold supply
on the right (when viewed from the front).
5. Turn on both water supplies letting the
water run at both hot and cold settings
for a few minutes to check all joints and
connections for any leaks.
Important: Access must be made
available to the water supplies and fixings
for future maintenance / servicing.
To change from bath to shower mode pull
the diverter know up. To revert back to
bath fill push the diverter knob back
down.
Hot supply
pipework Cold supply
pipework
Installation

10
Temperature Setting
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
The temperature is factory set at 38°C,
however this may be overridden by simply
pressing the temperature override button
in when the handle reaches the stop and
continuing to turn the handle.
To reset the maximum temperature the
following should be carried out.
1. Remove the end cap.
2. Unscrew the handle screw.
3. Remove the handle.
4. Turn the valve spindle in the
required direction.
To increase the temperature
turn the spindle anti-clockwise
To decrease the temperature
turn the spindle clockwise.
5. Replace the handle, tighten
the screw and push fit the
cap back into position.
Override
button
Valve spindle
Handle
Screw
Cap

11
Commissioning
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
The first step in commissioning a
thermostatic mixing valve is to check the
following:
1.The designation of the thermostatic mixing
valve matches the application.
2. The supply pressures are within the valves
operating range.
3. The supply temperatures are within the
valves operating range.
4. Isolating valves (and strainers preferred)
are fitted.
If all these conditions are met, proceed to set
the temperature as stipulated in the setting
section.
The mixed water temperature at the
terminal fitting must never exceed 46ºC.
When commissioning / testing is due the
following performance checks shall be
carried out:
• Measure the mixed water temperature
at the outlet.
• Carry out the cold water supply isolation
test by isolating the cold water sup-
ply to the TMV, wait for five seconds, if
the water is still flowing check that the
temperature is below 46ºC.
If there is no significant change to the set outlet
temperature (+/-)2ºC or less change from the
original setting) and the fail –safe shut off is
functioning, then the valve is working correctly
and no further service work is required.
Note: If there is a residual flow during the
commissioning or the annual verification
(cold water supply isolation test), then this is
acceptable providing the temperature of the
water seeping from the valve is no more than
2ºC above the designated maximum mixed
water outlet temperature setting of the valve.
Temperature readings should be taken at the
normal flow rate after allowing for the system to
stabilise.
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 re-tested in
accordance with the instructions in the setting
section.
The installation of thermostatic mixing valves
must comply with the requirements of the Water
Supply (Water Fittings) Regulations 1999.

12
Maintenance
Your product has a high quality finish
and should be treated with care to
preserve the visible surfaces. All
surfaces will wear if not cleaned
correctly, the only safe way to clean your
mixer is to wipe with a soft damp cloth.
Stains can be removed using washing
up liquid. All bath cleaning powders and
liquids will damage the surface of your
fitting, even the non-scratch cleaners.
Note: Never use abrasive detergents
or disinfectants or those containing
alcohol, hydrochloric acid or phosphoric
acid.
Before carrying out any maintenance,
turn off the both water supplies or close
any isolating valves.
Remove the cap and loosen the screw.
Pull the handle off from the valve
spindle.
Remove the valve using a suitable
spanner.
Clean the valve thoroughly under
cold water to remove any build up of
limescale or debris.
If necessary replace the valve using
parts supplied by Bristan only.
Replace the valve and push the handle
onto the valve spindle.
Tighten the screw and push-fit the cap
into position.
Flow Valve servicing / replacement
General Cleaning
Cap
Screw Handle
Valve
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.

13
Maintenance
Cartridge
Temperature stop
Handle
Screw
Cap
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
Turn off both the hot and cold water
supplies to the mixing valve and close
any stop / service valves.
Remove the cap and loosen the screw.
Pull the handle off from the valve
spindle.
Remove the temperature stop,
remembering the position when
removed.
Un-do grub screw and remove the
cartridge (push-in Cartridge). Clean/
replace with a new cartridge supplied
by Bristan.
Re-fit cartridge and temperature stop in
the same position when removed.
Tighten grub screw.
Push the handle onto the valve spindle.
Tighten the screw and push-fit the cap
into position.
Thermostatic Cartridge servicing / replacement
Grub Screw

14 Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
Troubleshooting
Symptom Cause Remedy
Maximum water tempera-
ture too hot or cold.
Maximum water
temperature set incorrectly.
Reset maximum water
temperature. Refer to
‘Commissioning’ section.
Outlet water temperature
too hot / cold.
Inlet filter is partially blocked. Check inlet filters for any
blockages and clean as necessary.
Installation conditions outside
operating parameters.
Service shower valve as
recommended. Refer to
maintenance section.
Water temperature too
cold – maximum water
temperature incorrectly set.
Hot water temperature is less
than 10ºC above the required
blend temperature.
Adjust hot water
temperature or wait for
water to reheat if stored system is
used.
Instantaneous water heater
not igniting because water
flow rate is too low.
Increase water flow rate through
the system.
Check cartridge inlet filters and
clean or replace.
Refer to maintenance section.
Contact the boiler
manufacturer.
Instantaneous water heater
not igniting because water
pressure is to low.
Refer to ‘Specification’ for
system requirements.
Increase water pressure through
system.
Contact the boiler
manufacturer.

15
Troubleshooting
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
Symptom Cause Remedy
Only hot or cold water from
TMV outlet.
Inlet water supplies are
reversed (hot to cold supply).
Check the connections are the
correct way round. Hot on the left
and cold on the right when viewed
from the front. Rework pipework
as necessary
Inlet filter is partially blocked. Clean or replace, flush through
pipework before refitting.
No flow or low flow rate
and / or varying
temperatures.
Partially closed stop or service
valve in water supply pipework
to the mixer valve.
Open stop or service valve.
Instantaneous water heater
cycles on and off as the flow
rate or pressure is too low.
Increase water flow rate or
pressure through system
Contact the boiler manufacturer.
Head of water is below the
minimum distance required.
Refer to the ‘Specification’ section.
Inlet filter is partially blocked. Clean or replace, flush through
pipework before refitting.
Hot or cold water being
drawn off elsewhere causing
pressure changes or instanta-
neous boiler changes.
Do not use other water outlets
when using the shower valve.
Make sure the maintained
inlet pressures are nominally
balanced and sufficient.
If pressures are unbalanced then
a pressure reducing valve should
be used.
Airlock or partial blockage of
the pipework.
Flush through pipework to ensure
removal of debris and any airlocks.
No hot or cold water reaching
the shower valve.
Check hot and cold feeds (the valve
will shut down if either the hot or
cold supply fails).

16 Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
Notes
Please use this space to add any notes you or your installes may have regarding the
plumbing system / installation of this product.

17
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.
Notes
Please use this space to add any notes you or your installes may have regarding the
plumbing system / installation of this product.

18
Guarantee
At Bristan, we want to make things as
easy as possible for our customers. That’s
why we design products that are easy to
fit and use, and that are quality tested to
make sure they won’t let you down. It’s
also why we offer solid guarantees on all
products, effective from the date of
purchase, to give you peace of mind.
Bristan’s Bathroom Taps are covered by
a 5 year guarantee. This also includes 5
year labour cover *(subject to
registration) which means that, in the
unlikely event that there is a problem in
the first year
after purchase, we’ll send one of our
expert engineers to fix it.
*Labour is provided by an approved
Bristan Care engineer or appointed
representative. The guarantee only applies
to products with a manufacturing fault.
There will be a call out charge for any
incidents where no fault has been found
with the product, or if the issue is due to
poor installation or maintenance.
Guarantee Terms and Conditions
This guarantee is in addition to your
statutory and other legal rights and is
subject to the following conditions:
•The product was purchased within
the United Kingdom or Republic of
Ireland.
•The guarantee applies solely to the
original purchaser with proof of
purchase.
•The installation must allow ready access
to all products for the purpose of
inspection, maintenance or replacement.
•Repair under this guarantee does not
extend the original expiry date. The
guarantee on any replacement parts or
product ends at the original expiry date.
•Any part found to be defective during
the guarantee period will be replaced
without charge, providing that the product
has been installed in accorance
with the instructions given in this guide
and used as the manufacturer intended.
The guarantee does not cover:
•Damage or defects caused by;
- General wear and tear (including
special non-chrome finishes;
components such as filters, seals, ‘O’
rings and washers)
- Incorrect installation
- Repair using non-Bristan parts
- Accidental or wilful misuse
- Corrosion and the use of
inappropriate cleaning products
- System debris including the build
up of limescale (which can be
controlled through regular servicing
and maintenance)
•Compensation for loss of use of the
product or consequential loss of any
kind.
In the interests of continuous product
improvement, Bristan reserves the right to
alter product specifications without notice.
The Bristan Product Guarantee does not
affect your statutory rights as a consumer.
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.

19
Guarantee & Service Policy
• Need help?
If this product does not function cor-
rectly when first used, contact Bristan
Care Customer Service on 0844 701 6273
where our expert team of advisors will be
able to offer you help and advice.
• Problems during the guarantee period
In the unlikely event that you encounter
any problems with the product during the
guarantee period, contact Bristan Care
Customer Service on 0844 701 6273 with
your proof of purchase and we will work to
resolve the problem quickly.
Bristan Care Customer Support
Bristan customers also benefit from the
support of Bristan Care, our
comprehensive customer support package
which offers:
Technical support hotline
(Tel: [phone]) with access to fully
trained advisers who can offer installation
advice, talk you through quick
maintenance checks, or recommend the
best course of action to fix any problems
with a product.
Expert advice
Find easy to follow ‘how to’ video guides
and technical FAQs online at
www.bristan.com. Our guides take you
step-by-step through many product instal-
lations and you can find plenty of easy
guides to quick product fixes and servic-
ing.
Spare parts
We hold thousands of spares and we keep
them for discontinued products for over
seven years. Spares can easily be ordered
online at www.bristan.com and are
dispatched the same day.
Expert plumbing engineers
If we can’t solve the problem over the
‘phone or with a spare part, then we’ll
send out one of our Bristan Care
engineers to take a look. Bristan Care
engineers provide free support for
products that are within guarantee, but
are also available to service products that
are out of guarantee for a small charge.
For details, please call Bristan Care
Customer Service on 0844 701 6273.
Need help? Give us a call on 0844 701 6273 and speak to one of our trained advisers.

20
Bristan Group Ltd.
Birch Coppice Business Park
Dordon
Tamworth
Staffordshire
B78 1SG
Web: www.bristan.com
Email: enquir[email protected]om
A Masco Company
Part Numbers: THBSM
Issue: D1
Useful contact details:
Customer Service:
0844 7016273
Customer Service Email:
[e-mail]
Customer Service Fax:
0844 7016275
Reception:
0844 7016274
Join us on...