rada Meynell V8/3 Product Manual

Rada Meynell V8/3

Thermostatic Mixing Valve

Important! This Manual is the property of the customer and must be
retained with the product for maintenance and operational purposes.

Product Manual

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INTRODUCTION

The Meynell V8/3 is a Thermostatic Mixing Valve specied to meet the highest

standards of safety, and reliability as demanded by today’s users. All Meynell products
are designed, manufactured and supported in accordance with accredited BS EN
ISO 9001: 2000 Quality Systems.

This Manual covers all Meynell V8/3 Thermostatic Mixing Valves manufactured from
June 1997.

The sufx ‘3’ indicates that this mixer has been certied for use in UK Healthcare
premises as a Type 3 valve under the BUILDCERT TMV3 scheme. For Healthcare

installation refer to the TMV3 Requirements Manual.

The approved designations for Type 3 Valves are as follows:

Model Designations

Rada Meynell V8/3 HP-S, HP-W, LP-S, LP-W

Important! The tting of any ow regulator will invalidate TMV3 compliance due to
the minimum ow rate requirements. Do not t ow regulators in TMV3 applications.

Meynell V8/3 Model Designation.

Description Installation

Meynell V8/3 Exposed or Built-In

Meynell V8/3 L Exposed or Built-In

Meynell V8/3 K Exposed or Built-In Locked Chrome

If you experience any difculty with the installation or operation of your new Mixing

Valve, then please refer to “Fault Diagnosis”, before contacting Kohler Mira Ltd.
Our telephone and fax numbers can be found on the back cover of this guide.

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Temperature

Adjustment

Short Lever

Adjustable

Long Lever

Adjustable

Finish

Chrome

Chrome

SAFETY : WARNINGS

Warning!

Products manufactured by us are safe provided they are installed, used and maintained
in good working order in accordance with our instructions and recommendations.

Caution!

1. Read all of these instructions.

2. Retain this guide for later use.

3. Pass on this guide in the event of change of ownership of the installation site.

4. Follow all warnings, cautions and instructions contained in this guide.

5. The plumbing installation must comply with the requirements of UK Water

Regulations/Bye-laws (Scotland), Building Regulations or any particular

regulations and practices, specied by the local water supplier. The installation
should be carried out by a plumber or contractor who is registered or is
a member of an association such as:

i) Institute of Plumbing (IOP), throughout the UK.
ii) National Association of Plumbing, Heating and Mechanical Services

Contractors (NAPH & MSC), England and Wales.

iii) Scottish and Northern Ireland Plumbing Employers’ Federation (SNIPEF),

Scotland and Northern Ireland.

6. Anyone who may have difculty understanding or operating the controls of any

appliance should be attended whilst operating. Particular consideration should

be given to the young, the elderly, the inrm, or anyone inexperienced in the

correct operation of the controls.

The use of the word “failsafe” to describe the function of a thermostatic mixing valve
is both incorrect and misleading. In keeping with every other mechanism it cannot
be considered as being functionally infallible.

Provided that the thermostatic mixing valve is installed, commissioned, operated

within the specication limits and maintained according to this Manual, the risk of

malfunction, if not eliminated, is considerably reduced.
Malfunction of thermostatic mixing valves is almost always progressive in nature

and will be detected by the use of proper temperature checking and maintenance
routines.

Certain types of system can result in the thermostatic mixing valve having excessive
‘dead-legs’ of pipework. Others allow an auxiliary cold water supply to be added

to the mixed water from the mixing valve. Such systems can disguise the onset of
thermostatic mixing valve malfunction.

Ultimately, the user or attendant must exercise due diligence to make sure that the

delivery of warm water is at a stable, safe temperature. This is particularly important
in such healthcare procedures as supervised bathing of patients unable to respond
immediately to unsafe temperatures.

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PACK CONTENTS

Tick the appropriate boxes to familiarize yourself with the part names and to

conrm that the parts are included.

Exposed Models

1 x V8/3

1 x Hexagonal Key

Or

3 x Fixing Screws

1 x V8/3 L

Or

1 x V8/3 K

1 x TMV3 Requirements Manual

2 x 6 L/M Flow

Regulators

(Note! see section:
Type 2 and Type 3
Valves - Application)

1 x Compression Nut

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Built-in Models

1 x V8/3 B

1 x V8/3 BL

1 x Hexagonal Key

3 x Fixing Screws

2 x 6 L/M Flow

Regulators

(Note! see section:
Type 2 and Type 3
Valves - Application)

1 x Rubber Grommet

1 x TMV3 Requirements Manual

1 x Foam Seal

1 x Concealing Plate

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SPECIFICATIONS

Normal Operating Conditions are considered as:

• inlet maintained pressures are nominally balanced

• daily usage 1-6 hours

• installation and usage environment not subject to extremes of temperature,
unauthorised tampering or wilful abuse.

Operating Parameters

For Type 3 installations, the supply conditions specied in the TMV3 Requirements

Manual take precedence over the operating parameters which follow.

Pressures And Flow Rates

For optimum performance, maintained supply pressures should be nominally

equal.
Maximum Pressure Loss Ratio: 10:1
Minimum Maintained Pressure: 0.1 bar (= 1 metre head from underside of cold tank

to outlet of shower tting)

Maximum Static Pressure: 10 bar

Thermostatic Mixing Valve

45

40

35

30

25

20

15

Flow Rate (L/Min)

10

5

0

0.1 0.2 0.3 0.4 0.5 1.0 2.0

Pressure Loss (bar)

Temperature Control

Minimum temperature differential between hot and outlet temperature: 10°C
Optimum temperature control range: 35 - 45°C
Maximum hot water temperature: 85°C (for safety, a recommended hot water storage

temperature maintained below 85°C and for ablutionary installations at between

60 to 65°C).

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The performance specification outlined below is achieved with outlet blend

temperature set between 35 - 45°C and supplies of 15°C cold and 65°C hot with

nominally equal pressures.

• Outlet blend temperature is maintained within 2°C with a 10°C change in hot
or cold supply.

• Thermostatic shut down to seepage within 2 seconds if cold supply fails. This is

achieved only if the hot supply temperature is 10°C above the set outlet blend

temperature.

Connections

• Inlet connectors are 15 mm compression

• Outlet connector is 1/2” BSP Male or 15 mm compression

Hot (H) and Cold (C) inlets are clearly marked and must be connected this way.

Dimensions

Exposed Model

160 mm

65 mm

122.5 mm

Built-in Model

130 mm Centres

161 mm

124 mm

35 mm

55 mm MAX

35 mm MIN

35 mm

122.5 mm

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