Meynell V8/3 Manuel utilisateur
1
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.
2
CONTENTS
Safety : Warnings ....................................................................................3
Advice.......................................................................................................3
Description...............................................................................................4
Pack Contents ......................................................................................... 5
Dimensions ..............................................................................................7
Specications ..........................................................................................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
3
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. Continueduseofthisproductinconditionsoutsidethespecicationlimitsgiven
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
withinthespecicationlimitsandmaintainedaccordingtothisManual,theriskof
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.
IfyouexperienceanydifcultywiththeinstallationoroperationofyournewMixing
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.
4
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.
Thesufx‘3’indicatesthatthismixerhasbeencertiedforuseinUKHealthcare
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
hasalsobeencertiedasaType2valveundertheBUILDCERTTMV2scheme.This
productalsocomplieswiththeWaterSupply(waterttings)Regulations1999.
A point of use Thermostatic Mixing Valve designed to supply temperature controlled
hot water to both single and multi-point installations.
Meynell V8/3:
Exposedorbuilt-inmodelwithstublever,allchromenish,swivelelbowsexcept
rising, falling or rear entry supplies. 15 mm compression inlet, 1/2” BSP or 15 mm
outlet connections.
Meynell V8/3 L:
Exposedorbuilt-inmodelwithlongleverfordisableduse,allchromenish,15mm
compression inlet, 1/2” BSP or 15 mm outlet connections.
Meynell V8/3 K:
Exposedmodelwithlocked(non-adjustable)controlknob,allchromenish,15mm
compression inlet, 1/2” BSP or 15 mm compression outlet connections.
DESCRIPTION
5
PACK CONTENTS
Exposed Models
Tick the appropriate boxes to familiarize yourself with the part names and to
conrmthatthepartsareincluded.
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
Or
Or
6
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
7
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
8
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
ForType2and3valvesthesupplyconditionsspeciedinsection:‘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
tooutletofshowertting)
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
PressureLoss(bar)
FlowRate(L/Min)
Thermostatic Mixing Valve
9
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)andCold(C)inletsareclearlymarkedandmustbeconnectedthisway.
•
•
10
INSTALLATION REQUIREMENTS
Isolating Valve
Mixing Valve
OverowIndicator
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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