Bristan MT503CP Mounting instructions

Installation Instructions
and User Guide
Temperature Stabilised
Thermostatic Mixing Valve
Models Covered:
MT503CP, 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.

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Welcome to your new Bristan Mixing Valve
All products manufactured and supplied by Bristan are safe provided they are installed,
used correctly and receive regular maintenance in accordance with these instructions.
Isolation valves must be fitted to the inlet water supplies to ensure ease of future
maintenance. This product must not be modified in any way as this will invalidate the
guarantee.
Full access must be made available for future maintenance / servicing purposes.
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.
These mixing valves have also been tested to the TMV2 and TMV3 schemes and
comply to BS EN: 1287 and BS EN: 1111; so long as they are commissioned and serviced
in line with TMV standards. Please read the TMV guide supplied with this valve for
further information.
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,
Essex,
RM12 6NB, Tel: [phone]
Contents
Contents
• Specification 3
• Dimensions (mm) 3-4
• Installation 5-8
• General Cleaning 9
• Maintenance 9-10
• Notes 11

3
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Specification
Pressure
BAR
1.0
5.0
4.0
2.0 3.0
0.
Pressure
BAR
1.0
5.0
4.0
2.0 3.0
0.
Maximum Static Pressure:
1.0 MPa (10.0 bar)
Maximum Pressure Dierential: 20:1
Temperature Dierential: +/-2°C from set temperature
The sensitive wax capsule will shut down the valve if the hot or
cold water supply fails, provided that there is at least a 10°C
dierence between the mixed water temperature and the
remaining supply.
Min: 0.01 MPa
(0.1 bar)
Max: 0.25 MPa
(2.5 bar)
Working Pressures
Inlet & Outlet
Connection
15mm
Compression
Specifications Inlet Water Temperature
5°C
20°C
Cold Water Supply
Min: 5°C Max: 20°C 65°C Recommended
Hot Water Supply
80°C
IMPORTANT
The inlet hot water must
be at least 10°C above the
required blend temperature.
TMV2 & TMV3 Designations
65°C
LP-B, HP-B, LP-W,
HP-W, LP-T, HP-T,
LP-S, HP-S
Outlet
Temperature
Pre-set to
43°C
Dimensions (mm)
MT503CP
To replace any spare parts
for your mixing valve, why not
scan the QR Code or
visit www.bristan.com
and search for your product.
Spare Parts
145
60
105

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60
105
200
Dimensions (mm)
MT503CP-ISO
MT503CP-ISOELB
105
60
190

5
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Installation
IMPORTANT: Please ensure both supply pipes are flushed before connecting the
mixing valve to prevent plumbing/pipe debris from entering the mixing valve.
Also ensure that the mixing valve is situated in a place where the commissioning,
testing and maintenance of to TMV standards can be undertaken.
Please read the TMV guide supplied with this product for more information.
If you have purchased MT503CP; we advise installing isolation valves as close as its
practical to the mixing valve for ease of maintenance.
Please check component drawings for completeness before starting installation.
1. Plumb the pipes to the desired
location for the mixing valve,
ensuring that they’re secure in
position.
2. Connect the valve to the pipework,
We recommend using a high
tightening torque (45-50Nm) on
all compression fittings to secure
the valve.
IMPORTANT: Please ensure both
supply pipes are flushed before
connecting the mixing valve to
prevent plumbing/pipe debris from
entering the mixing valve.
Remember: Ensure the valve is fitted
with the hot inlet on the left, cold
on the right when viewed from the
front.
3. Connect your chosen outlet to the
mixing valve. Turn on the water
supply and check all joints and
connections for any leaks.
4. Please refer to the TMV guide in
order to test and commission the
mixing valve.

6
23 24
12
3
45
67
8
9
10
11
13
12
14
15
16
17
18
19
20
21
22
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Installation
MT503CP-ISOELB
MT503-ISOELB Components List
Part
No.
Description Qty Part
No.
Description Qty
1Anti-tamper Cover 113 Piston Assembly 1
2Head Assembly 114 Return Spring 1
3Clamp Ring 1 15 Body 1
4Outer Spring 116 15mm Compression Nut 5
51/2” Check Valve 2 17 15mm Compression Ring 5
6BS206 O-Ring 70 Shore 2 18 Thermostat 1
7Flat-Face Adaptor 219 Thermostat Housing 1
8Filter Washer 220 BS120 O-Ring 80 Shore 1
9Isolation Elbow Assembly 221 BS023 O-Ring 70 Shore 1
10 3/4” Adaptor Assembly 2 22 Plain Ring 1
11 3/4” Coupling Nut 2 23 BS010 O-Ring 90 Shore 1
12 Fibre Washer 224 Adjusting Screw 1
Components List

7
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Installation
MT503 Components List
Part
No.
Description Qty Part
No.
Description Qty
1Anti-tamper Cover 112 Body 1
2Adjusting Screw 1 13 Piston Assembly 1
3Head Assembly 114 3/4” Adaptor Assembly 2
4Plain Ring 115 Bucket Filter 2
5Clamp Ring 1 16 15mm Compression Nut 3
6BS023 O-Ring 70 Shore 1 17 15mm Compression Ring 3
7Outer Spring 118 1/2” Check Valve 2
8BS120 O-Ring 80 Shore 1 19 Fibre Washer 2
9Thermostat Housing 120 3/4” Coupling Nut 2
10 Thermostat 121 BS010 O-Ring 90 Shore 1
11 Return Spring 1
21 3
4
5
6
7
8
9
10
11
12
13
1415
16 17 18 19 20
1 2
MT503CP

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Installation
13
2
4
5678
9
10
11
12
13
14
15
16
17
18
19
20
21
MT503CP-ISO
MT503-ISO Components List
Part
No.
Description Qty Part
No.
Description Qty
1Anti-tamper Cover 112 Return Spring 1
2Adjusting Screw 1 13 15mm Compression Ring 3
3Head Assembly 114 15mm Compression Nut 3
4BS023 O-Ring 70 Shore 1 15 Body 1
53/4” Coupling Nut 2 16 Thermostat Housing 1
61/2” Check Valve 2 17 Thermostat 1
715mm Inlet Isolation Valve 2 18 Fibre Washer 2
8 Filter Mesh 219 Clamp Ring 1
9BS120 O-Ring 80 Shore 1 20 Plain Ring 1
10 Outer Spring 121 BS010 O-Ring 90 Shore 1
11 Piston Assembly 1

9
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General Cleaning
Bristan products are made from
premium materials, with hand polishing
and electroplated finishes.
Your shower kit should be regularly
cleaned with warm water, a mild
pH-neutral liquid soap, and polished
with a soft cloth. Any residues from
soap, toothpaste, shampoos and
shower gels can cause blemishes if
not rinsed o straight after use.
Maintenance
3. Remove the thermostat (10/17/18),
piston assembly (11/13), thermostat
housing (9/16/19) and return spring
(11/12/14).
4. Soak all components in a suitable
solution until fully de-scaled. Check
all seals and O-Rings for damage
and replace if necessary.
5. Re-grease parts using a WRAS
Approved grease and reverse the
steps to re-assemble the valve.
6. Turn on the water supply and check
all joints and connections for any
leaks.
7. Follow the Temperature Adjustment
process to check and re-calibrate
the maximum temperature.
Cartridge Cleaning
To clean the cartridge, follow
the steps below:
1. Isolate the hot and cold water
supplies. Remove the anti-tamper
cover (1).
Note: If you have purchased the
MT503CP-ISO or MT503CP-ISOELB,
simply turn the screws in the
isolation assemblies to isolate the
water supplies.
2. Unscrew the head assembly (2/3)
from the body (12/15) using a
suitable spanner.
IMPORTANT: Note the position of
the Adjusting Screw (2/24) before
removing. It will need to be replaced
in the same position in order to
maintain the current maximum
temperature.
Household bleaches and cleaners
contain harsh chemicals and may
damage the surface finish. Avoid using
abrasive cloths, scouring pads, scrub
sponges, steel wool or anything similar.

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Maintenance
Temperature Adjustment
This valve is pre-set to a maximum
outlet temperature of 43°C.
It can be adjusted to have a maximum
temperature between 30°C - 55°C
IMPORTANT: To comply with the
TMV scheme, this valve cannot have a
maximum outlet temperature of 44°C.
If set higher, it will no longer comply
with the TMV scheme.
Please see the TMV manual supplied
with this valve for more details.
To adjust the temperature, follow
the steps below:
1. Turn on the valve and set to the
maximum temperature.
2. Remove the anti-tamper cover (1)
from the body (6). Using a suitable
hex key, insert through the head
assembly (3) and locate into the
groove of the adjusting screw (2).
3. Turn the adjusting screw (2) clockwise
for a cooler temperature, anti-
clockwise for a hotter temperature.
4. Wait for a few minutes after adjusting
for the temperature to stabilise. Use
a thermometer to measure the outlet
temperature. Repeat step 3 until you
have reached the desired result.
5. Replace the anti-tamper cover (1).
Head Assembly Parts
Part
No.
Description Qty
2Adjusting Screw 1
3Head Assembly 1
4BS010 O-Ring 90 Shore 1
5BS029 O-Ring 1
2
5
4
3

11
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Notes

Bristan Group Ltd.
Birch Coppice Business Park
Dordon
Tamworth
Staordshire
B78 1SG
Web: www.bristan.com
Email: [e-mail]
A Masco Company
At Bristan, we want to make things as easy as possible for our customers. That’s why we oer solid guarantees on
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To start your free guarantee simply scan the QR code and register your product.
Alternatively visit www.bristan.com/register.
For any other queries, please call our Customer Service on 0330 026 6273 where our expert team of advisors
will beable to oer you any help and advice
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Part Number: 800516
Issue: D6