Bristan MT503CP Mounting instructions

Installation Instructions
and User Guide
Temperature Stabilised
Thermostatic Mixing Valves
Complying with N.H.S
Estates Model Engineering
Specification D08
Models covered:
MT503CP,
MT503CP-22, MT503CP-ISO,
MT503CP-ISOELB
Please keep this booklet for future
Reference.
Installer, when you have read these
instructions please ensure you leave them
with the user.

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 give us a call on 0844 701 6273.
Introduction …………….…………..………………………………………………..
Specifications ………..………………………………………………………………
Conditions for Use (Type 2).…………………………………………….….…
Commissioning ..........................……………………………………………..
In-Service Testing ………………………………………………………………….
Conditions for us (Type 3) …………………………………......................
General Assembly & Servicing Guide …………………………………...
MT503CP to MT503CP-ISOELB ……………………………………………..
Parts Diagram ……………………………………………………………………….
Guarantee ……………………………………………………………………………..
3
4-6
7-8
9
10-11
12
16
17-18
18-23
24
2
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Commissioning ..........................……………………………………………..
In-Service Testing ………………………………………………………………….
13
14-15
Notes ……………………………………………………………………………......... 25-26

It has been recognised that users of hot water in care establishments are at risk from
scalding.
This risk has been reduced by the use of thermostatic mixing valves.
In order to assure the performance of thermostatic mixing valves N.H.S. Estates Model
Engineering Specification DO8 was written. The valve listed in the following pages has
been tested and approved to this standard by a third party as part of the Build Cert
scheme for use within their designated applications.
This Thermostatic mixing valve has also been tested to the TMV2 scheme which works to
the tests found in the BS EN 1287 (LP) and BS EN 1111 (HP)
The following abbreviated designation codes are used throughout this booklet. Detailed
descriptions are given below:-
Sirrus MT503CP APPROVED FOR USE IN THE FOLLOWING DESIGNATIONS
For full installation instructions and method of temperature adjustment see
General Assembly and Servicing Guide
Introduction
3
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CODE OPERATING PRESSURE APPLICATION
HP-S HIGH PRESSURE SHOWER
HP-W HIGH PRESSURE WASH BASIN
LP-S LOW PRESSURE SHOWER
LP-W LOW PRESSURE WASH BASIN
HP-T44 HIGH PRESSURE BATH FILL WITH TEMPERATURE UP TO 44ºc
HP High pressure LP Low pressure
S Shower
W Washbasin
T44 Bath with fill temperature of 44°C max
T46 Bath with fill temperature of 46°C max
SE Shower with economy flow rate WE Washbasin with economy flow rate

142.50
Specifications
Minimum pressure drop through fitting for correct mixing 0.1 bar (1 Metre head)
Maximum dynamic pressure across mixer should not exceed 2.5 bar (25 Metre head)
Maximum static pressure to be applied to fitting 10.0 bar (100 Metre head)
Maximum pressure loss ratio 20:1 either supply
Temperature stability with normal variation of supply
temperatures and pressures
±2ºC from set
temperature
Factory set standard blend temperature 43ºC
Maximum hot supply temperature 80ºC
The sensitive wax capsule will shut down the operation of the valve if either the hot or
cold water supply fails, provided a minimum differential of 10ºC exists between the mixed
water temperature and the remaining supply.
Performance
Flow rates are in litres per minute at an open outlet with equal pressure drops, fitted with
check valves and filters as supplied.
Pressure Drop
(Bar) 0.1 0.2 0.4 0.6 0.8 11.5 2.5 3 4 5
Flow Rate
(Litres / Min) 5.9 9.8 14.7 18.2 21.3 23.8 30.5 35.0 -- -- --
59.50
103.50
Connections
Inlet: 15mm compression
Outlet: 15mm compression
MT503CP
4
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MT503CP-22
Specifications cont.
179
59.50
MT503CP-ISO
198
59.50 103.50
103.50
Connections
Inlet: 15mm compression
Outlet: 15mm compression
Connections
Inlet: 22mm compression
Outlet: 15mm compression
5
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Specifications cont.
MT503CP-ISOELB
187.85
103.34
16.9
Connections
Inlet: 15mm compression
Outlet: 15mm compression
6
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Conditions for Use for Type 2 Valves
7
Note: Valves operating outside these conditions cannot be guaranteed by the
Scheme to operate as Type 2 valves.
The valves designation of use, LP if testes against BS EN 1287, HP if tested against
BS EN 1111 and HP & LP if tested against both standards.
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.
Minimum supply pressure for LP Tub application is 0.2 bar.
Recommended outlet temperatures
The BuildCert TMV scheme recommends the following set maximum mixed water
outlet temperatures for use in all premises:
44°C Bath fill but see notes below
41˚C for Showers.
41°C for Washbasins
The mixed water temperatures must never exceed 46˚C.
The maximum mixed water temperature can be 2˚C above the recommended
maximum set outlet temperatures.
Note: 46˚C is the maximum mixed water temperature from the bath tap. The
maximum temperature takes account of the allowable 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!
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Conditions for Use for Type 2 cont.
8
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The British Burns Association recommends 37 to 37.5˚C as a comfortable bathing
temperature for children. In premises covered by the Care Standards Act 2000, the
maximum mixed water outlet temperature is 43˚C.
The thermostatic mixing valve (TMV) will be installed 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 practicable to the water
supply inlets of the thermostatic mixing valve.

Commissioning
9
Commissioning notes for Thermostatic Mixing Valves
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 provided.
If all these conditions are met, proceed to set the temperature as stipulated in the
maintenance section.
The mixed water temperature at the terminal fitting must never exceed 46˚C.
It is a requirement that all TMV2 approved valves shall be verified against the original
set temperature results once a year. 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 supply to
the TMV, wait for five seconds, if water is still flowing check that the temperature is
below 46˚C.
If there is no significant change to the set outlet temperature (+/-2˚C or less change
from the original settings) and the fail-safe shut off is functioning, then the valve is
working correctly and no further service work is required.
Notes: 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 2˚C 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 Maintenance section.
The installation of thermostatic mixing valves must comply with the requirements of
the Water Supply (Water Fittings) Regulations 1999.
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In-Service Testing
10
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Purpose
The purpose of in service tests is to regularly monitor and record the performance of the
thermostatic mixing valve. Deterioration in performance can indicate the need for service
work on the valve and / or water supplies.
Procedure
Using the same measuring equipment or equipment to the same specification as used in
the commissioning section, adjust the temperature of the mixed water in accordance with
the manufactures instructions and the requirement of the application, Carry out the
following sequence.
a) Record the temperature of the hot and cold water supplies.
b) Record the temperature of the mixed water at the largest draw-off flow rate.
c) Record the temperature of the mixed water at a smaller draw-off flow rate,
which shall be measured.
If the mixed water temperature has changed significantly from the previous test results
(e.g. >1K), record the change and before re-adjusting the mixed water temperature
check:a) That any in-line or integral strainers are clean.
b) Any in-line or integral check valves or other anti-back siphonage devices are in
good working order.
c) Any isolating valves are fully open.
With an acceptable mixed water temperature, complete the following procedure:
a) Record the temperature of the hot and cold water supplies.
b) Record the temperature of the mixed water at the largest draw-off flow rate.
c) Record the temperature of the mixed water at a smaller draw-off flow rate,
which shall be measured.
d) Isolate the cold water supply to the mixing valve and monitor the mixed water
temperature.
e) Record the maximum temperature achieved as a result of (d) and the final
stabilised temperature.
f) Record the equipment, thermometer etc. used for the measurements.
If at step (e) the final mixed water temperature is greater than 41ºC and / or the
maximum temperature exceeds the corresponding value from the previous results by
more than about 2K, the need for service work is indicated.
Note: In-service tests should be carried out with a frequency, which identifies a need for
service work before an unsafe water temperature can result. In the absence of any other
instruction or guidance, the procedure described in Annex F of D 08 may be used.

In-Service Testing cont.
11
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Annex F of D 08 (informative)
Frequency of In-service tests
General
In the absence of any other instruction or guidance on the means of determining the
appropriate frequency of in-service testing, the following procedure may be used:
a) 6 to 8 weeks after commissioning carry out the tests in ‘In-Service Tests’.
b)12 to 15 weeks after commissioning carry out the tests detailed in ‘In-
Service Tests’.
Depending on the results of the above tests, several possibilities exist:
a) If no significant changes (e.g. <1K) in mixed water temperatures are
recorded between commissioning and 6 to 8 week testing, or between
commissioning and 12 to 15 week testing the next in-service test can be
deferred to 24 to 28 weeks after commissioning.
b) If small changes (e.g. 1 to 2K) in mixed water temperatures are recorded in
only one of these periods, necessitating adjustment of the mixed water
temperature, then the next in-service test can be deferred to 24 to 28 weeks
after commissioning.
c) If small changes (e.g. 1 to 2K) in mixed water temperatures are recorded in
both these periods, necessitating adjustment of the mixed water
temperature, then the next in-service test should be carried out at 18 to 21
weeks after commissioning.
d) If significant changes (e.g. > 2K) in mixed water temperatures are recorded
in either of these periods, necessitating service work, then the next
in-service test should be carried out at 18 to 21 weeks after commissioning.

Conditions of Use for Type 3Valves
12
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In order to give compliance with N.H.S. specification D08 the table below lists the
conditions for normal use. These valves will perform adequately outside these
parameters, however they cannot be guaranteed by the scheme to operate as Type 3
valves. If they are required to work with other supply conditions an engineer must carry
out a risk assessment and satisfy themselves that the valves are suitable for use.
Table 1: Normal Conditions of Type 3 valves
Table 2: Mixed Water Temperature
Note 1: For wash basins, washing under running water is assumed.
Note 2: Bath fill temperatures of more than 44ºC should only be available when the
bather is always under the supervision of a competent person (e.g. Nurse or Care
Assistant.
Note 3: A thermostatic mixing valve having multiple designations (i.e it is capable of
satisfying the requirements of this specification for more than one application) should
be re-set on site to suit its other designations.

Commissioning notes for Thermostatic Mixing Valves
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 provided.
If all these conditions are met, proceed to set the temperature as stipulated in the
maintenance section.
The mixed water temperature at the terminal fitting must never exceed 46˚C.
It is a requirement that all TMV2 approved valves shall be verified against the original
set temperature results once a year. 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 supply to
the TMV, wait for five seconds, if water is still flowing check that the temperature is
below 46˚C.
If there is no significant change to the set outlet temperature ( /-2˚C or less change
from the original settings) and the fail-safe shut off is functioning, then the valve is
working correctly and no further service work is required.
Notes: Ifthere isa residual flow during the commissioning or the annual verification
(cold water supply isolation test), then this is acceptable providing thetemperature of
the water seeping from the valve is no more than 2˚C above the designated maximum
mixed water outlet temperature setting ofthe 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 inthe water that
is to be tested.
Any TMVthat hasbeen adjusted or serviced must be re-commissioned andre-tested
in accordance with the instructions in the Maintenance section.
The installation ofthermostatic mixing valves must comply with the requirements of
the Water Supply (Water Fittings) Regulations 1999.
Commissioning
13
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In-Service Testing
Need help? Give us acall on 0844 701 6273 and speak toone of our trained advisors.
Purpose
The purpose of in service tests is to regularly monitor and record the performance of the
thermostatic mixing valve.
Deterioration in performance can indicate the need for service work on the valve and / or
water supplies.
Procedure
Using the same measuring equipment or equipment to the same specification as used in
the commissioning section, adjust the temperature of the mixed water in accordance
with the manufactures instructions and the requirement of the application, Carry out the
following sequence.
a) Record the temperature of the hot and cold water supplies.
b) Record the temperature of the mixed water at the largest draw-off flow rate.
c) Record the temperature of the mixed water at a smaller draw-off flow rate,
which shall be measured.
If the mixed water temperature has changed significantly from the previous test results
(e.g. >1K), record the change and before re-adjusting the mixed water temperature
check:
a) That any in-line or integral strainers are clean.
b) Any in-line or integral check valves or other anti-back siphonage devices are in
good working order.
c) Any isolating valves are fully open.
With an acceptable mixed water temperature, complete the following procedure:
a) Record the temperature of the hot and cold water supplies.
b) Record the temperature of the mixed water at the largest draw-off flow rate.
c) Record the temperature of the mixed water at a smaller draw-off flow rate,
which shall be measured.
d) Isolate the cold water supply to the mixing valve and monitor the mixed water
temperature.
e) Record the maximum temperature achieved as a result of (d) and the final
stabilised temperature.
Note: The final stabilised mixed water temperature should not exceed the values
in Table 17
f) Record the equipment, thermometer etc. used for the measurements.
14

In-Service Testing
Table 17: Guide to
maximum stablised
temperatures
recorded during site
tests
If at step (e) the final mixed water temperature is greater than 41ºC and / or the
maximum temperature exceeds the corresponding value from the previous results by
more than about 2K, the need for service work is indicated.
Note: In-service tests should be carried out with a frequency, which identifies a need
for service work before an unsafe water temperature can result. In the absence of any
other instruction or guidance, the procedure described in Annex F of D 08 may be used.
Annex F of D 08 (informative)
Frequency of In-service tests
General
In the absence of any other instruction or guidance on the means of determining the
appropriate frequency of in-service testing, the following procedure may be used:
a)6 to 8 weeks after commissioning carry out the tests in ‘In-Service Tests’.
b) 12 to 15 weeks after commissioning carry out the tests detailed in ‘In-Service
Tests’.
Depending on the results of the above tests, several possibilities exist:
a) If no significant changes (e.g. <1K) in mixed water temperatures are recorded
between commissioning and 6 to 8 week testing, or between commissioning and
12 to 15 week testing the next in-service test can be deferred to 24 to 28 weeks
after commissioning.
b) If small changes (e.g. 1 to 2K) in mixed water temperatures are recorded in
only one of these periods, necessitating adjustment of the mixed water
temperature, then the next in-service test can be deferred to 24 to 28 weeks
after commissioning.
c) If small changes (e.g. 1 to 2K) in mixed water temperatures are recorded in
both these periods, necessitating adjustment of the mixed water temperature,
then the next in-service test should
d) If significant changes (e.g. > 2K) in mixed water temperatures are recorded in
either of these periods, necessitating service work, then the next in-service test
should be carried out at 18 to 21 weeks after commissioning.
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1. Isolate hot and cold supplies. Remove Head Cover.
2. Unscrew Head from Body.
3. Remove Adjusting screw from Head (N.B. Note approximate position of Adjusting
screw in Head before removing.
Replacement of Adjusting screw in same position upon re-assembly ensures virtual
restoration of original temperature).
4. Remove Thermostat, Piston assembly / Thermostat housing and Return spring.
TO CLEAN
1. Soak all metal parts in de-scalent, wash off in clean water.
2. Lightly grease all metal parts with silicone grease.
3. Replace worn and damaged 'O'rings.
RE-ASSEMBLY
1. Replace Return spring and Piston assembly / Thermostat housing and Thermostat.
2. Re-assemble Adjusting screw to Head to original setting.
3. Screw Head into Body. Continue until it reaches a dead stop.
4. Slight temperature adjustment may be necessary upon re-introduction
of supply.
TEMPERATURE SETTING
1. Turn Adjustment screw clockwise for
cooler temperature, anti-clockwise for
warmer temperature. Replace Head
Cove r.
NOTE :-All installation and maintenance procedures should be carried out in accordance
with these guidelines. Please read these guidelines before commencing any new
installation or servicing of existing units.
General Assembly & Servicing Guide
HOT
HOT
COLD
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16

MT503CP to MT503CP-ISOELB
1. Remove the compression nuts, olives
and plastic filters from the standard
MT503CP inlet ports.
2. Place the ‘O’ ring provided in this kit
onto the flat face adaptor.
3. Insert the flat face adaptor assembly
into the hot and cold inlet ports.
Compression Nut
Olive
Plastic Filter
Flat Face
Adaptor
‘O’ ring
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MT503CP to MT503CP-ISOELB
Isolation Elbow
Seal / Filter
15mm
Compression
4. Push the seal /filter into theisolation
elbow.
5. Attach theisolation elbow assembly to
the hot and cold inlet ports.
Note: Check all joints and connections are sealed from leakage.
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18

Parts Diagram
MT503CP
1Valve Body 9Head Cover
2Valve Head 10 Check Valve
3Piston Assembly 11 Compression Nut
4Thermostat Element 12 Compression Ring
5Return Spring 13 ‘O’ Ring
6‘O’ Ring 14 Temperature Adjusting Screw
7‘O’ Ring 15 Filter
827mm Dia Head Label 16 Inlet Adapter
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Parts Diagram cont.
1Valve Body 13 Return Spring
2Valve Head 14 Thermostat Element
3Head Cover 15 Check Valve
4BS010 ‘O’ Ring 16 22mm Wire Mesh Filter
5Temperature Adjusting Screw 17 15mm Compression Ring
6Plain Ring 18 15mm Compression Nut
7Clamp Ring 19 22mm Adaptor Assembly
8BS023 ‘O’ Ring 19A Check Valve Body
9Overtravel Spring 19B ¾" Connecting Nut
10 ‘O’ Ring 80 SH EP11/8/3 19C 22mm Annealed Copper Olive
11 Piston 19D 22mm Compression Nut
12 Extended Thermostat Housing 24E WRC approved fibre washer for ¾
BSP flat face connection
MT503CP-22
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20