Mira Select Flex User manual

MIRA SELECT FLEX

INSTALLATION AND USER GUIDE

THERMOSTATIC MIXER

These instructions must be left with the user.

INTRODUCTION

Thank you for purchasing a quality Mira product.

To enjoy the full potential of your new product,

please take time to read this guide thoroughly.

Having done so, keep it handy for future

reference.

The Mira Select Flex is a thermostatic mixer with

separate ow and temperature controls. The lever

controlshavebeendesignedtobeeasilyoperated

by users with restricted hand movement.

The thermostatic mixer incorporates a wax

capsuletemperaturesensingunit,whichprovides

an almost immediate response to changes of

temperature of the incoming water supplies to

maintain the selected showering temperature.

Anadjustabletemperaturestopisprovidedwhich

limits the maximum temperature to a safe level.

Inlet lters are tted to protect the thermostatic

cartridge.

On exposed models the thermostatic mixer

has adjustable inlets to fit pipework centres

between 139 mm and 153 mm and is designed

for connection to rising, falling or rear entry

pipework.

The Mira Select Flex has been certied for use

in UK Healthcare premises as a Type 3 valve

under the BUILDCERT TMV3 scheme. The Mira

Select Flex has also been certied as a Type

2 valve under the BUILDCERT TMV2 scheme.

For Healthcare* installations refer to section:

‘Type 2 and Type 3 Valves’. This product also

complies with the Water Supply (water ttings)

Regulations 1999.

*Healthcare applications are hospitals, aged

person facilities, residential care homes, etc. and

any other application where the user is similarly

at risk.

If you experience any difficulty with the

installation or operation of your new

thermostatic mixer, please refer to ‘Fault

Diagnosis’,beforecontactingKohlerMiraLtd.

Our contact details can be found on the back

cover of this guide.

CONTENTS

Introduction 2

Guarantee 3

Recommended Usage 3

Patents and Design Registration 3

Safety Warnings 3

Pack Contents 4

Specications 5

Pressures 5

Temperatures 5

Thermostatic Shut-down 5

Connections 5

Flow Rates 5

Dimensions 6

Installation 7

Suitable Plumbing Systems 7

General 7

Exposed Thermostatic Mixers 8

Built-in Thermostatic Mixers 10

Control Assembly 19

Reversed Inlet Supplies 20

Operation 21

Commissioning 22

Exercising the Thermostat 22

Maximum Temperature 22

Maximum Temperature Setting 22

Type 2 and Type 3 Valves 23

Application 23

Commissioning 23

Maintenance 24

Maintenance 25

General 25

Planned Maintenance 25

Fault Diagnosis 27

Inlet Filters 28

Notes 29

Spare Parts 30

Exposed Models 30

Built-in Models 31

Customer Service Back Page

Guarantee

For domestic installations, Mira Showers

guaranteetheMiraSelectFlexagainstanydefect

in materials or workmanship for a period of ve

years from the date of purchase (shower ttings

for one year).

For non-domestic installations, Mira Showers

guaranteetheMiraSelectFlexagainstanydefect

in materials or workmanship for a period of one

year from the date of purchase.

For terms and conditions refer to the back cover

of this guide.

Recommended Usage

Application Valve Only Valve with

Fittings

Domestic ü ü

Light Commercial ü ü

Heavy Commercial ü û

Healthcare ü û

Note! Heavy duty shower ttings are available

separately for use in Healthcare and Heavy

Commercial applications, for details contact

Customer Services.

Patents and Design Registration

Patents:

GB: 2 291 693, 2 392 225, 2 421 297

US: 7 240 850

Euro: 1 672 257 DE, FR, GB, IT, NL, SE

Patent Applications:

GB: 2 435 077, 0712546.1

US US-2006-0124758

US-2007-0221740

Euro: 03254070.0

Design Registration:

000834007/01, 000834007/02,

000578463-0006

SAFETY WARNINGS

Mirathermostaticmixersareprecisionengineered

and should give continued safe and controlled

performance, provided:

1. Theyareinstalled,commissioned,operatedand

maintainedinaccordancewithmanufacturer’s

recommendations.

2. For Type 2 and Type 3 installations, they

are only used for applications covered by

their approved designations, refer to section:

‘Type 2 and Type 3 Valves’.

3. Periodic attention is given, when necessary,

to maintain the product in good functional

order.

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. Anyone who may have difculty understanding

oroperatingthecontrolsofanyshowershould

be attended whilst showering. Particular

consideration should be given to the young,

the elderly, the inrm or anyone inexperienced

in the correct operation of the controls.

This is particularly important in healthcare

procedures,suchassupervisedbathingwhere

patients are unable to respond immediately to

unsafe temperatures.

6. Rapid/Excessive movement of the ow and/or

temperaturecontrolsmayresultin momentary

unstable blend temperatures.

7. Care is required when adjusting flow or

temperature, make sure that the temperature

has stabilised.

8. When this product has reached the end of its

serviceable life, it should be disposed of in a

safe manner, in accordance with current local

authority recycling, or waste disposal policy.

PACK CONTENTS

Tick the appropriate boxes to familiarise yourself

with the part names and to conrm that the parts

are included.

q1 x Mira Select Flex Exposed Shower Control

q1 x Mira Select Flex Built-in Shower Control

(attached to the building-in shroud)

q1 x ‘O’ Key

q2 x Olives

q2 x Compression Nuts

q3 x Compression Nuts

q1 x 12 L/Min Flow Regulator

q1 x Hexagon Key, 2.5 mm

q1 x ‘O’ Key

q2 x Screws, No 8 x 1¼”

q2 x Wall Plugs

q2 x Olives

q2 x Concealing Plates

q1 x Hexagon Key, 2.5 mm

q2 x Screws, No 8 x 1 ¼”

q2 x Wall Plugs

q2 x Securing Clips

q2 x Concealing Caps

q1 x 12 L/Min Flow

Regulator

Documentation

q1 x Installation Template

q1 x Mira Select Flex Built-in Control Assembly

q2 x M5 x 40 mm Screws

q2 x Securing Brackets

q2 x Bracket Screws

SPECIFICATIONS

For Type 2 and Type 3 Valves, the supply

conditions specied in section: ‘Type 2 and Type

3 Valves -Application’ takeprecedenceoverthe

operating parameters which follow.

Pressures

Max Static Pressure:• 10 Bar.

Max Maintained Pressure:

• 5 Bar.

Min Maintained Pressure (Gravity System):

• 0.1 Bar (0.1 bar=1Metrehead fromcoldtank

base to showerhead outlet).

Note! For gravity fed or other low pressure

systems (0.5 bar or below) do not t the outlet

ow regulator (where applicable).

For optimum performance supplies should be

• nominally equal.

Temperatures

Factory Pre-set (Blend) Shower: • 41°C.

Optimum Thermostatic Control Range:• 35°C

to 43°C (achieved with supplies of 15°C cold,

65°C hot and nominally equal pressures).

Recommended Hot Supply:• 60°C to 65°C

Note! The mixing valve can operate at

higher temperatures for short periods without

damage, however this could detrimentally

affect thermostatic performance. For safety

and performance reasons it is recommended

that the maximum hot water temperature is

limited to 65°C.

Cold Water Range: up to• 25°C.

MinimumRecommendedDifferentialbetween• Hot Supply and Outlet Temperature: 12°C.

Thermostatic Shut-down

For safety and comfort the thermostat will• shut off the mixing valve within 2 Seconds if

either supply fails (achieved only if the blend

temperature has a minimum differential of

12°C from either supply temperature).

Connections

Inlets: 15 mm Compression.•

Outlet: ½” BSP Flat Face (Exposed models), •

15 mm Compression (Built-in models)

Standard connections are:

• hot - left, cold -

right, outlet - bottom (Exposed models),

top (Built-in models).

Flow Rates

Typical Flow Rates on Low Pressure Systems,

Mira Select Flex with Mira Select Flex Shower

Fittings:

0.2

00.4 0.60.8 1

Supply Pressure (bar)

Flow Rate (l/min)

Typical Flow Rates on High Pressure Systems

(with 12 Litre/Min ow regulator tted in shower

control outlet), Mira Select Flex with Mira Select

Flex Shower Fittings:

0.511.522.5

Supply Pressure (bar)

33.5 4

Flow Rate (l/min)

139 - 153

134

Ø71

198

214

Ø56

Ø183

114

All dimensions are in mm.

69 67-85

Dimensions

INSTALLATION

Suitable Plumbing Systems

Gravity Fed:

The thermostatic mixer must be fed from a cold

water cistern (usually tted in the loft space) and

a hot water cylinder (usually tted in the airing

cupboard) providing nominally equal pressures.

Mains Pressurised Instantaneous Hot Water

System (Combination Boiler):

The thermostatic mixer can be installed with

systems of this type with balanced pressures.

(Recommended Minimum Maintained Pressure:

1.0 Bar).

Unvented Mains Pressure System:

The thermostatic mixer can be installed with an

unvented, stored hot water system.

Pumped System:

The thermostatic mixer can be installed with an

inlet pump (twin impeller). The pump must be

installed in a suitable location and in accordance

with its instructions.

General

Installation must be carried out in accordance

withtheseinstructions,andmustbeconductedby

designated, qualied and competent personnel.

The installation must comply with the “Water

Supply Regulations 1999 (Water Fittings)” or any

particular regulations and practices, specied by

the local water company or water undertakers.

Note! Make sure that all site requirements

correspond to the information given in section:

‘Specications’. For Type 2 and Type 3 Valves

seealsosupplyconditions in section: ‘Type2 and

Type 3 Valves’.

1. The mixer must not be installed in an area

where it may freeze.

2. For stud partitions alternative xings may be

required.

3. ‘Full bore’ isolating valves must be installed

close to the mixer for ease of maintenance.

4. Pipework must be rigidly supported and avoid

any strain on the connections.

5. Pipework dead-legs should be kept to a

minimum.

6. Decide on a suitable position for the mixer.

The position of the mixer and the shower

ttings must provide a minimum gap of 25 mm

betweenthespill-overlevelofthe shower tray/

bath and the showerhead (refer to illustration).

This is to prevent back-siphonage. For further

information on the installation of your shower

ttings, refer to the ttings installation and

user guide.

Note! Only use shower ttings recommended

by the manufacturer or supplier.

Hose Retaining Ring

25 mm Minimum

Spill-over

Level

Important! A hose retaining ring should be

tted to prevent the showerhead from dropping

below the spillover level of the shower tray/

bath, which could lead to contamination from

back-siphonage. This hose retaining ring

shouldmeetthe majorityofuserrequirements

for shower installations with exible outlet

fittings. However, there will be occasions

when the hose retaining ring will not provide a

suitable solution. In these instances an outlet

doublecheckvalve,e.g.the Mira DCV-H, must

be tted. The inclusion of the Mira DCV-H

will increase the required supply pressure

typically by 10 kPa (0.1 bar), refer to section:

‘Accessories’.

Exposed Thermostatic Mixers

Installing the Thermostatic Mixer

1. The thermostatic mixer can be installed with

rear, rising or falling supply inlets. Decide

on the most appropriate method for your

installation, and if necessary, loosen the

grubscrews and rotate the inlet elbows to

suit.

Important! Make sure that the elbows are

pushed fully onto the mixer before tightening

the grubscrews, do not overtighten.

2. Use the installation template to mark the

positions of the holes for the backplate and

the pipe centres.

For rising or falling supplies the pipe positions

should be set 35 mm from the centre of pipe

to the nished wall at 153 mm centres.

Note!Allow a minimum of 150 mm either side

of the mixer to allow servicing of the hot and

cold inlet lters.

Note! The thermostatic mixer has adjustable

inlets to t existing pipework centres between

139 mm and 153 mm.

35 mm

Allow a minimum of

150 mm either side

of mixer to wall

3. For solid walls drill the holes for the backplate

with a 6 mm drill and insert the wall plugs. For

other types of wall structure alternative xings

may be required (not supplied).

6 mm Drill

Wall Plug

4. For Rear Entry Supplies Only:

a) Drill the holes for the supply pipes at

153 mm centres.

b) Recess the inlet holes Ø32 mm x 10 mm

deep to allow for the concealing plates.

Note! Depth must be sufcient to prevent

the concealing plates fouling on the

plumbing elbows.

5. Fit the supply pipework: Hot - Left, Cold

- Right. The inlet pipework should extend

13 mm from the nished wall surface.

Note! If it is not possible to install the mixer

with this pipework conguration complete the

installation then refer to section: ‘Reversed

Inlet Supplies’.

10 mm minimum

between elbow

and nished wall

surface

Ø32 mm

13 mm from nished

wall surface

Elbow

Recess Ø32 mm

x 10 mm deep

13 mm

153 mm

HOT

COLD

6. Remove the backplate from the mixer by

loosening the grubscrew with a 2.5 mm

hexagonal key.

7. Secure the backplate to the wall using the

screws.

Screw

Backplate

8. For Rear Entry Supplies Only:

a) Fit the concealing plates over the inlet

pipes.

Note! Apply silicone sealant to the back

face of the ange.

Apply Silicone Sealant

Concealing Plate

9. Caution! It is essential at this point

that the supply pipework is thoroughly

ushedthroughbeforeconnectiontothe

mixer. Failure to do so may result in product

malfunction and will not be covered under the

guarantee.

10.Fit the compression nuts and olives onto the

pipework.

11.Align the mixer with the pipework and fit

onto the backplate. Minor misalignment of

the pipework can be accommodated by the

inlets, which are adjustable between 139 and

153 mm centres.

Important! Make sure that the hot and cold

inletsonthemixercorrespondwiththehotand

cold inlet supplies.

12.Using a suitable tool, tighten the waterway

securing ring until it abuts the adjustable inlet

preventing outward movement.

Concealing Cap

(assembled)

Waterway

Securing Ring

Securing

Clip Concealing

Cap

13.Assemble the concealing caps and securing

clips and push into the elbow.

14.Tighten the compression nuts onto the mixer

with a suitable spanner.

Caution!Takecarenottodamagethechrome

surfaces.

15.Tighten the grubscrew to secure the mixer to

the backplate.

16. Fit the shower ttings, refer to your shower

fittings installation and user guide for

instructions.

Note! For high pressure systems (above

0.5 bar) make sure that the ow regulator

(supplied) is tted inside the outlet nipple (refer

to illustration).

Important! The tting of this ow regulator will

invalidateanyTMV2orTMV3compliancedue

to the minimum ow rate requirements. Do

not t the ow regulator in TMV2 and TMV3

applications.

Flow Regulator

17.Turn on the hot and cold water supplies and

check for leaks.

18.Before using the shower, refer to section:

‘Commissioning’.

Built-in Thermostatic Mixers

Solid Wall or Stud Partition Fixing

using Rear Mountings

1. Determine the route for the hot and cold

supply pipework and for the outlet pipework.

When connecting to BIV Shower Fittings it is

recommended that the outlet be positioned

above and to one side of the mixer. This is to

prevent the exible hose from obstructing the

shower controls.

2. Removethetwoshroudscrews(retainforlater

use) and remove the building-in shroud from

the mixer.

3. Determine the position of the mixer and draw

around the building-in shroud.

4. Mark the routes for the hot and cold supply

pipework (Hot - Left, Cold - Right) and for

the outlet pipework.

Note! (if applicable) The outlet elbow should

be sited above the mixer and on the right or

left, as site dictates.

Outlet Pipe BIR

Outlet Pipe BIV Outlet Pipe BIV

Cold InletHot Inlet

Thermostatic

Mixer

Alternative Pipe

Layouts

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