BRISTAN TWV2 Bar Showers User Guide

BRISTAN TWV2 Bar Showers

IMPORTANT

Installer, when you have read these instructions please ensure you leave them with the user.
Please keep this booklet for future reference.

General Information

This product has been tested to the TMV2 scheme which complies with the BS EN 1287:1999 (LP) and BS 1111:1999 (HP) thermostatic mixing valve standards. It also satisfies the requirements of the water supply (water fittings) regulations 1999 and current bylaws.
BS 6700 recommends the temperature of stored water should never exceed 65°C. A stored water temperature of 60°C is considered sufficient to meet all normal requirements and will minimise the build up of lime scale in hard water areas.
Important : Nominally equal (balanced) inlet supply pressures are recommended for optimum performance with mixer showers.
This shower valve should be installed in compliance with the Water Regulations.
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:01708 472791

Guide to designations

HP   High Pressure
LP   Low Pressure
S    Shower

Recommended  Usage

Domestic|

✓

| Heavy Commercial|

✓

Light Commercial|

✓

| Health Care|

✓

Condition of use for type 2 thermostatic Mixer Value

than 25

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 a pp I icati on is 0.2 bar.

Recommended outlet temperatures

The NSF TMV scheme recommends the following set maximum mixed water outlet temperatures for use in all . premises:

44 °C Bath fi 11 but see notes below
41 ° C for Showers.
41°C for Washbasins
38°C for Bidets

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.

Conditions of Use for Type 2 Thermostatic Mixer Valves

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 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.

In-Service Testing

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. >lK), record the change and before readjusting 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 isloating 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 equiptment, thermometer etc. used for the measurments.

If at step (e) the final mixed water temperature is greater than 41QC and/ or the maximum temperature exceeds the corresponding value from the previous results by more than about 2K, the need for service work is indicared.

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.

Customer Support

BRISTAN

Bristan Group Ltd.
UK: Bristan Group, B78 lSG.
EU: Masco Europe S.a.r.l. 14 Rue Strachen 6933 Mensdorf Luxembourg

Customer Service: +44330 026 6273
Web: www.bristan.com
Email: enquire@bristan.com
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