Meynell V8/3 Manuale utente

V8/3

THERMOSTATIC

MIXING VALVE

PRODUCT MANUAL

IMPORTANT

Installer: This Manual is the property of the customer

and must be retained with the product for

maintenance and operational purposes.

CONTENTS

Safety : Warnings ....................................................................................3

Advice.......................................................................................................3

Description...............................................................................................4

Pack Contents ......................................................................................... 5

Dimensions ..............................................................................................7

Specications ..........................................................................................8

Installation Requirements .................................................................... 10

Installation .............................................................................................12

General............................................................................................... 12

Reverse Outlet Connector .................................................................13

1. Exposed Models ............................................................................14

2. Built-in Models................................................................................15

Commissioning .....................................................................................17

Exercising the Thermostat..................................................................17

Commissioning Checks......................................................................17

Maximum Temperature.......................................................................18

Maximum Temperature Setting ..........................................................18

Operation ...............................................................................................19

Fault Diagnosis......................................................................................20

Maintenance...........................................................................................21

General............................................................................................... 21

Planned Maintenance............................................................................22

Healthcare..........................................................................................22

Frequency of In-service Tests ...........................................................22

Checkvalves and Filters .....................................................................23

Type 2 and Type 3 Valves...................................................................... 25

Application..........................................................................................25

Installation Conditions ........................................................................ 26

Commissioning...................................................................................26

Maintenance.......................................................................................27

Spare Parts ............................................................................................ 28

Notes ......................................................................................................30

Customer Care.........................................................................Back Page

The function of a thermostatic mixing valve is to deliver water consistently at a safe

temperature. This requires that:

1. It is installed, commissioned, operated and maintained in accordance with the

recommendations given in this manual.

2. Type 2 and 3 valves are only used for applications covered by their approved

designations.

3. Periodic attention is given, as necessary, to maintain the product in good functional

order. Recommended guidelines are given in section: ‘Maintenance’.

4. Continueduseofthisproductinconditionsoutsidethespecicationlimitsgiven

in this Manual can present potential risk to users.

SAFETY : WARNINGS

ADVICE

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 ensure 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.

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.

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 section: ‘Type 2 and Type 3 Valves’. In this case this product

hasalsobeencertiedasaType2valveundertheBUILDCERTTMV2scheme.This

productalsocomplieswiththeWaterSupply(waterttings)Regulations1999.

A point of use Thermostatic Mixing Valve designed to supply temperature controlled

hot water to both single and multi-point installations.

Meynell V8/3:

Exposedorbuilt-inmodelwithstublever,allchromenish,swivelelbowsexcept

rising, falling or rear entry supplies. 15 mm compression inlet, 1/2” BSP or 15 mm

outlet connections.

Meynell V8/3 L:

Exposedorbuilt-inmodelwithlongleverfordisableduse,allchromenish,15mm

compression inlet, 1/2” BSP or 15 mm outlet connections.

Meynell V8/3 K:

Exposedmodelwithlocked(non-adjustable)controlknob,allchromenish,15mm

compression inlet, 1/2” BSP or 15 mm compression outlet connections.

DESCRIPTION

PACK CONTENTS

Exposed Models

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

conrmthatthepartsareincluded.

Documentation

1 x NHS Requirements Booklet

1 x V8/3

1 x V8/3 L

1 x V8/3 K

1 x Hexagonal Key

3 x Fixing Screws

1 x Olive

1 x Compression Nut

Built-in Models

1 x Hexagonal Key

3 x Fixing Screws

Documentation

1 x NHS Requirements Booklet

1 x V8/3 B

1 x V8/3 BL

1 x Foam Seal

1 x Rubber Grommet

1 x Concealing Plate

DIMENSIONS

Exposed Model

Built-in Model

160 mm

130 mm Centres

122.5 mm

65 mm

35 mm

161 mm

124 mm

55 mm MAX

35 mm MIN

122.5 mm

35 mm

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2and3valvesthesupplyconditionsspeciedinsection:‘Type 2 and

Type 3 Valves, Application’ 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

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).

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.

•

INSTALLATION REQUIREMENTS

Isolating Valve

Mixing Valve

Overow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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