rada Meynell V8/3 Manuel utilisateur
1
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
2
3
If you experience any difculty 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.
INTRODUCTION
The Meynell V8/3 is a Thermostatic Mixing Valve specied 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 sufx ‘3’ indicates that this mixer has been certied 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:
Meynell V8/3 Model Designation.
Description Installation Temperature
Adjustment Finish
Meynell V8/3 Exposed or Built-In Short Lever
Adjustable Chrome
Meynell V8/3 L Exposed or Built-In Long Lever
Adjustable Chrome
Meynell V8/3 K Exposed or Built-In Locked Chrome
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.
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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, specied 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 difculty understanding or operating the controls of any
appliance should be attended whilst operating. Particular consideration should
be given to the young, the elderly, the inrm, 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 specication 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.
SAFETY : WARNINGS
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PACK CONTENTS
Exposed Models
Tick the appropriate boxes to familiarize yourself with the part names and to
conrm that the parts are included.
1 x V8/3
1 x V8/3 L
1 x V8/3 K
1 x Hexagonal Key
3 x Fixing Screws
2 x 6 L/M Flow
1 x Compression Nut
Or
Or
Regulators
(Note! see section:
Type 2 and Type 3
Valves - Application)
1 x TMV3 Requirements Manual
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Built-in Models
1 x Hexagonal Key
3 x Fixing Screws
1 x V8/3 B
1 x V8/3 BL
1 x Foam Seal
1 x Rubber Grommet
1 x Concealing Plate
2 x 6 L/M Flow
Regulators
(Note! see section:
Type 2 and Type 3
Valves - Application)
1 x TMV3 Requirements Manual
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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 specied 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
SPECIFICATIONS
0.1 0.2 0.3 0.4 0.5 1.0 2.0
0
5
10
15
20
25
30
35
40
45
Pressure Loss (bar)
Flow Rate (L/Min)
Thermostatic Mixing Valve
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.
Exposed Model
160 mm
130 mm Centres
122.5 mm
65 mm
35 mm
Dimensions
Built-in Model
161 mm
124 mm
55 mm MAX
35 mm MIN
122.5 mm
35 mm
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INSTALLATION REQUIREMENTS
Isolating Valve
Mixing Valve
Overow Indicator
Pressure Reducing Valve
Float Valve Twin Impeller Pump
Single Impeller Pump
Tempering Valve
Mini Expansion Vessel
Key to Symbols
The Meynell V8/3 Thermostatic Mixing Valve is compatible with the following
systems:
Gravity fed system
The Mixing Valve MUST be fed from a
cold water cistern and hot water cylinder
providing nominally equal pressure.
Gas heated system
The Mixing Valve MUST be installed with
a gas water heater or combination boiler
of a fully modulating design.
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Unvented mains pressure system
The Mixing Valve can be installed with a
unvented, stored hot water cylinder.
Mains pressurised instantaneous hot
water system (thermal store)
The Mixing Valve can be installed with
systems of this type with balanced
pressures.
Pumped system
The Mixing Valve can be installed with an
inlet pump (twin impeller). The pump must
be installed on the oor next to the hot
water cylinder.
Air Separation
30°-60°
90°
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