Kohler 1333238-W2-A Installation And User Manual

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1333238-W2-A

Installation and User Guide

These instructions must be left with the user

ERD Bar Valve and Fittings

Mira Honesty

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1333238-W2-A

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1333238-W2-A

Introduction

Thank you for choosing a Mira shower. To enjoy the full potential of
your new shower, please take time to read this guide thoroughly, and
keep it handy for future reference.

Guarantee

Recommended Usage

For domestic installations, Mira Showers guarantee this product
against any defect 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 guarantee this
product against any defect in materials or workmanship for a period
of one year from the date of purchase.

Failure to follow the instructions provided with the shower will
invalidate the guarantee.

For Terms and Conditions refer to the 'Customer Service'.

Domestic



Light Commercial



Heavy Commercial



Healthcare



Design Registration

Design Registration Number 005259041-0006-0007

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1333238-W2-A

Pack Contents

 1 x Bar Valve

 2 x Wall Brackets

 2 x Concealing Plates

 2 x Compression Nuts

 2 x Olives

 2 x Washers/Filters

 2 x Wall Plugs

 2 x Fixing Screws

 2 x Wall Plugs

 1 x Wall Fixing Bracket

 2 x Fixing Screws

 1 x Grubscrew

 1 x Riser Arm

 1 x Concealing

Cover

 1 x Handset

 1 x Retaining

Ring

 1 x Clamp Bracket

 1 x Hose

 2 x Hose Washer

 1 x Lower Bar

 1 x Middle Bar

 1 x Overhead

Shower

 1 x Valve Component Pack

(Packed with valve)

 1 x Pipe Guide

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1333238-W2-A

Safety Information

WARNING - This product can deliver scalding temperatures if

not operated, installed or maintained in accordance with the

instructions, warnings and cautions contained in this guide.
The function of a thermostatic mixing valve is to deliver water
consistently at a safe temperature. In keeping with every other

mechanism, it cannot be considered as functionally infallible and

as such, cannot totally replace a supervisor’s vigilance where that
is necessary. Provided it is installed, commissioned, operated and
maintained within manufacturers recommendations, the risk of
failure, if not eliminated, is reduced to the minimum achievable.
PLEASE OBSERVE THE FOLLOWING TO REDUCE THE RISK OF
INJURY:

INSTALLING THE SHOWER

1. Installation of the shower must be carried out in accordance with

these instructions by qualied, competent personnel. Read all

instructions before installing the shower.

2. DO NOT install the shower where it may be exposed to freezing

conditions. Ensure that any pipework that could become frozen
is properly insulated.

3. DO NOT perform any unspecied modications, drill or cut holes
in the shower or ttings other than instructed by this guide. When

servicing only use genuine Kohler Mira replacement parts.

4. If the shower is dismantled during installation or servicing then,
upon completion, an inspection must be made to ensure all
connections are tight and that there are no leaks.

USING THE SHOWER

1. The shower must be operated and maintained in accordance with

the requirements of this guide. Make sure you fully understand
how to operate the shower before use, read all instructions and
retain this guide for future reference.

2. DO NOT switch the shower on if there is a possibility that the water

in the shower unit or ttings is frozen.

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1333238-W2-A

3. The shower can be used by children aged from 8 years and above

and persons with reduced physical, sensory or mental capabilities
or lack of experience and knowledge if they have been given
supervision or instruction concerning use of the appliance in a
safe way and understand the hazards involved. Children must not
be allowed to play with the shower.

4. Anyone who may have di󰀩culty understanding or operating the

controls of any shower should 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.

5. DO NOT allow children to clean or perform any user maintenance

to the shower unit without supervision.

6. Always check the water temperature is safe before entering the

shower.

7. Use caution when altering the water temperature while in use,

always check the temperature before continuing to shower.

8. DO NOT t any form of outlet ow control. Only Mira recommended
outlet ttings should be used.

9. DO NOT operate the temperature control rapidly, allow 10-15
seconds for the temperature to stabilise before use.

10. Use caution when altering the water temperature while in use,

always check the temperature before continuing to shower.

11. DO NOT switch the shower o󰀨 and back on while standing in the

water ow.

12. DO NOT connect the outlet of the shower to any tap, control valve,

trigger handset or showerhead other than those specied for use

with this shower. Only Kohler Mira recommended accessories
must be used.

13. The showerhead must be descaled regularly. Any blockage of the

showerhead or hose may a󰀨ect showering performance.

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1333238-W2-A

Specication

• Max Static Pressure: 10 Bar.

• Max Maintained Pressure: 5 Bar.

• Min Maintained Pressure: (Gas Water Heater): 1.0 Bar (for

optimum performance supplies should be nominally equal).

• Min Maintained Pressure (Gravity System): 0.1 Bar (0.1 bar =

1 Metre head from cold tank base to shower handset outlet).

Pressures

• Close temperature control is provided between 20°C and 50°C.

• Optimum Thermostatic Control Range: 35°C to 45°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 temperatures up to 85°C for short periods
without damage. However for safety reasons it is recommended

that the maximum hot water temperature is limited to 65°C).

• Minimum Recommended Di󰀨erential between Hot Supply and

Outlet Temperature: 12°C at desired ow rates.

• Minimum hot water supply temperature: 55°C.

Temperatures

• For safety and comfort the thermostat will shut o󰀨 the mixing

valve within 2 Seconds if either supply fails (achieved only if

the blend temperature has a minimum di󰀨erential of 12°C from
either supply temperature).

Thermostatic Shut-down

Connections

• Hot: Left - 15mm pipework, 3/4” BSP to valve.

• Cold: Right - 15mm to pipework, 3/4” BSP to valve.

• Outlet: Bottom - 1/2” BSP Male to exible hose.

Note! This product does not allow for reversed inlets and will

deliver unstable temperatures if tted incorrectly.

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1333238-W2-A

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.

Gas Heated System:

The thermostatic mixer can be installed with a combination boiler.

Unvented Mains Pressure System:

The thermostatic mixer can be installed with an unvented, stored hot water system.

Mains Pressurised Instantaneous Hot Water System:

The thermostatic mixer can be installed with systems of this type with balanced
pressures.

Pumped System:

The thermostatic mixer can be installed with an inlet pump (twin impeller). The
pump must be installed on the oor next to the hot water cylinder.

General

1. Installation of the shower must be carried out in accordance with these

instructions by qualied, competent personnel.

2. The plumbing installation must comply with all national or local water regulations
and all relevant building regulations, or any particular regulation or practice

specied by the local water supply company.

3. Make sure all pressures and temperatures comply with the requirements of the

shower. See ‘Specications’.

4. Full bore / non restrictive isolating valves must be tted in a readily accessible

position adjacent to the shower to facilitate maintenance of the shower.

DO NOT use a valve with a loose washer plate (jumper) as this can lead to a

build up of static pressure.

5. Use copper pipe for all plumbing.

6. DO NOT apply excessive force to plumbing connections; always provide

mechanical support when making plumbing connections. Any soldered joints
should be made before connecting the shower. Pipework must be rigidly
supported and avoid any strain on the connections.

7. Pipework dead-legs should be kept to a minimum.

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1333238-W2-A

10. Only use the inlet connections supplied with the product. DO NOT use any

other type of ttings.

11. DO NOT overtighten connections, screws or grubscrews as product damage
may occur.

8. Position the shower unit where the controls are at a convenient height for the
user. Position the showerhead so that the water sprays in line with the bath or
across the opening of a shower cubicle. The installation must not cause the
shower hose to be kinked during normal use or obstruct the use of the control
handles.

9. The position of the shower unit and hose retaining ring must provide a minimum
air gap of 25 mm between the showerhead and the spill over level of any bath,
shower tray or basin. There must be a minimum distance of 30 mm between
the showerhead and the spill over lever of any toilet, bidet or other appliance

with a Fluid Category 5 backow risk.

Note! There will be occasions when the hose retaining ring will not provide a

suitable solution for Fluid Category 3 installations, in these instances an outlet

double checkvalve must be tted, this will increase the required supply pressure
typically by 10kPa (0.1 bar). Double checkvalves tted in the inlet supply to
the appliance cause a pressure build up, which a󰀨ect the maximum static inlet
pressure for the appliance and must not be tted. For Fluid category 5 double

checkvalves are not suitable.

Zone of

Backow

Risk

30 mm

Minimum

Toilet or Bidet

FC5

Hand Basin

FC3

Bath or Shower

Tray FC3

Mixer

Shower

25 mm

Minimum

25 mm Minimum

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1333238-W2-A

43

21

Wall Bracket

Make sure that the pipework has been
installed correctly and that it protrudes

25 mm from the nished wall surface.

Hold the wall bracket in position and

mark the position of the xing holes.

Drill the xing holes using an 8 mm

diameter drill.

Fit the plastic pipe guide over the inlet
pipes. Level the pipe guide and secure
to the wall to hold in position. Leave the

guide in place and nish the wall.

Installation of the Bar Valve Fast Fix Kit

Before installing the pipework, please ensure that there is a minimum of 1260 mm
height clearance to allow for the rigid riser and overhead to be installed above. If
installing in a restricted height area, a shorter riser rail can be ordered as a spare part.

25 mm

150 mm

25 mm

8 mm

Plastic Pipe
Guide

HOT

COLD

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1333238-W2-A

10

9

8

7

6

5

Install the wall plugs.

Install the xing screws and tighten.

Install the olives and the connectors.

Tighten nger tight and then another

1/4 to 1/2 turn.

Turn on the water supply and ush the

pipework.

Install the concealing plates.

Assemble the bar valve with a sealing

washer / lter in each inlet and attach

to the wall bracket.

Note! Connections are: Hot-Left,
Cold- Right.

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1333238-W2-A

Installing the Shower Fittings

1. Fit the hose retaining ring and clamp bracket to the middle bar, then screw all

three bars together.

2. Fit the wall bracket into the riser arm with the grub screw at the top.

3. Make sure that the lower bar is pushed fully into the valve to engage the seal.

Failure to do so will position the wall bracket incorrectly and may result in a
leak from around the outlet of the valve.

4. Mark holes for the vertical wall xing bracket. Use the riser arm assembly as

a guide and ensure it is vertical.

5. Remove assembled bar and xing bracket.

6. Drill the holes for the wall xing bracket. Fit the wall plugs and x the bracket

to the wall using the screws supplied.

7. Ret the bar into the shower unit and loosely t the concealing cover to the
riser arm. Ensure lower bar is tted correctly as shown in diagram below.

8. Fit the riser arm onto the wall xing bracket and tighten the grubscrew with a

2.5 mm hex key. Fit the concealing cover over the bracket.

9. Tighten the grubscrew at the rear of the shower unit to secure the bar using
the 1.5 mm hexagonal wrench. Fit the plug.

10. Fit the overhead spray.

Note! A ow regulator (not supplied) may be required for installation on high

pressure systems (above 0.5bar).

11. Fit the shower hose through the hose retaining ring and connect to both the
shower unit and the showerhead. Connect the conical with red cover or white
label to the showerhead.

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1333238-W2-A

Riser

Arm

Overhead

Showerhead

Hose Retaining Ring

Lower Bar

Hose

O-seal

O-seal

the lower pipe)

O-seal

Middle

Bar

Clamp Bracket

Wall fixing
Bracket

Concealing
Cover

2.5 mm
Hexagonal
Wrench

Riser
Arm

Remove red
protective cover
or white label
before fitting

1.5 mm Wrench

Plug

Note! Make sure this bar is
pushed fully into the top of the
valve and grub screw secured.
(failure do so may cause a leak)

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1333238-W2-A

Commissioning

Hub

Fixing Screw

Hot +

Cold -

Temperature Knob

Inside View of

Temperature Knob

Maximum Temperature Setting

Follow this procedure to check and adjust the temperature before using the shower

for the rst time. Make sure that all users are familiar with the operation of the
shower. This guide is the property of the homeowner and must be left with
them following installation completion.

The shower’s maximum temperature has been preset to 46°C, but may require

adjustment for the following reasons:

• To reset to a comfortable temperature (may be required to suit the

plumbing system).

• To suit your showering preference.

The following procedure requires a constant supply of hot water at a minimum
temperature of 55°C.

1. Turn the shower ON to full ow.

2. Turn to full hot. Allow the temperature and

ow to stabilise.

3. To set the temperature to either warmer
or cooler, pull off the temperature
knob taking care not to rotate the hub.
Note! Take care not to damage the chrome

if a tool is used to lever o󰀨.

4. To increase the temperature, rotate the hub
in an anticlockwise direction, colder turn
clockwise. Make small adjustments and
allow temperature to settle before making
further adjustments. Continue to adjust until
the required temperature is achieved.

5. Remove the xing screw securing the hub
and ret aligning the hub as shown. Clips to

be orientated in the 3, 6, 9 and 12 O'clock
positions.

6. Retighten the xing screw without rotating

the hub.

7. Push on the temperature knob making sure
that it locates correctly.

Note! The arrow on the inside of the handle

should point downwards.

8. Rotate the temperature knob to full cold
then rotate back to full hot and check the
maximum temperature is set correctly.

Clips

Clips

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1333238-W2-A

Operation

User Maintenance

Flow Operation

Use the ow handle to turn the shower on / o󰀨 and select either the overhead or

the showerhead.

Adjusting the Temperature

Use the temperature handle to make the shower warmer or cooler.

WARNING! PLEASE OBSERVE THE FOLLOWING TO REDUCE THE RISK OF
INJURY OR PRODUCT DAMAGE:

1. DO NOT allow children to clean or perform any user maintenance to the shower

unit without supervision.

2. If the shower is not to be used for a long period, the water supply to the shower

unit should be isolated. If the shower unit or pipework is at risk of freezing during

this period, a qualied, competent person should drain them of water.

Cleaning

Many household and commercial cleaners, including hand and surface cleaning
wipes contain abrasives and chemical substances that can damage plastics, plating

and printing and should not be used. These nishes should be cleaned with a mild

washing up detergent or soap solution, and then wiped dry using a soft cloth.
Important! The showerhead must be descaled regularly, keeping the showerhead

clean and free from limescale will ensure that your shower continues to give the best

performance. Limescale build up can restrict the ow rate and may cause damage

to your shower.

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1333238-W2-A

Inspecting the Hose

Important! The shower hose should be inspected periodically for damage or internal

collapse, internal collapse can restrict the ow rate from the showerhead and may

cause damage to the shower.

Use your thumb or a soft cloth to wipe any limescale from the nozzles.

1. Unscrew the hose from the showerhead and the shower outlet.

2. Inspect the hose.

3. Replace if necessary.

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1333238-W2-A

Fault Diagnosis

Symptom Cause / Rectication

Water too hot or
too cold

Inlets reversed (hot supply to cold inlet of shower unit),

rework inlet pipework.

Check the washer / lters are not blocked.

Check the maximum temperature setting (If you have a

combination type boiler it may not be producing su󰀩cient
hot water at the desired ow rate). Fit a ow regulator to the

outlet of the shower unit.
Installation conditions outside operating parameters, refer
to ‘Specications’ and ‘Commissioning’.

Poor temperature
control

Make sure that the inlet temperature di󰀨erentials are
su󰀩cient, refer to ‘Specications’.

Fluctuating or

reduced ow

Check the showerhead and hose are not blocked.

Check the washer / lters are not blocked.

Make sure that the maintained inlet pressures are nominally
balanced and su󰀩cient, refer to ‘Specications’.
Air lock or partial blockage in the pipework.

Water leaking from
the showerhead

Water may drain from the showerhead for a short period
after showering, this is normal.

Water leaking from
the hose on the bar
valve

Check that the lower riser bar is fully located in the top of
the bar valve.
Check the hose washer is fitted and conical nut fully
tightened.

If you require a Mira trained service engineer or agent, refer to ‘Customer Service’.

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1333238-W2-A

Spare Parts

1836.179

Fixing Kit

1836.171

Concealing

Plate

1836.174

Washer / Filter

(x2)

1901.022

Flow

Cartridge Nut

1744.108

Thermostatic
Cartridge

1901.014

Knob Assembly

1901.023

Temperature Cartridge
Retaining Plate Assy

Flow
Cartridge

1901.018

1901.015

Flow Knob

Assembly

1901.017

Plug

1878.155

9 l/min

1878.156

6 l/min

1878.157

12 l/min

Flow Regulator

Pack (2 pcs per pack)

1736.740 Seal Pack - ‘A’

A

A

(x2)

(x2)

1736.735

Short Bar

(A short bar can be

ordered if the ceiling

height is too low for the

Lower Bar supplied)

1736.734

Lower Bar

1736.732

Middle Bar

1703.199

Hose Retaining

Ring

632.73

Hose Seal

(x2)

1901.019

Clamp

Bracket

1901.011

Overhead

250 mm

1836.182

Riser Arm

1736.733

Wall Fixing

1264162

Hose (1.25 m)

A

(x2)

1901.012

Showerhead

Note! These ow regulators
are tted in the shower ttings

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1333238-W2-A

Notes

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1333238-W2-A

Customer Service

© Kohler Mira Limited, April 2018

Mira is a registered trade mark of

Kohler Mira Limited.

The company reserves the right to alter

product specifi cations without notice.

14648

Guarantee

Your product has the bene t of our manufacture's

guarantee which starts from date of purchase. This
guarantee only applies in the United Kingdom and
Republic of Ireland. To activate this guarantee, please
return your completed registration card, visit our
website or free phone [phone] within 30 days

of purchase (UK only).

Within the guarantee period we will resolve defects in
materials or workmanship, free of charge, by repairing
or replacing parts or product as we may choose.

This guarantee is in addition to your statutory
rights and is subject to the following conditions :

● The guarantee applies solely to the original

installation under normal use and to the original
purchaser only. The product must be installed and
maintained in accordance with the instructions
given in this guide.

● Servicing must only be undertaken by us or our

appointed representative.
Note! If a service visit is required the product must
be fully installed and connected to services.

● Repair under this guarantee does not extend

the original expiry date. The guarantee on any
replacement parts or product ends at the original
expiry date.

● For shower  ttings or consumable items we

reserve the right to supply replacement parts only.

The guarantee does not cover:

● Call out charges for non product faults (such as

damage or performance issues arising from
incorrect installation, improper use, inappropriate
cleaning, lack of maintenance, build up of
limescale, frost damage, chemical attack,

corrosion, system debris or blocked  lters) or

where no fault has been found with the product.

● Water or electrical supply, waste and isolation

issues.

● Compensation for loss of use of the product or

consequential or indirect loss of any kind.

● Damage or defects caused if the product is
repaired or modi ed by persons not authorised by

us or our appointed representative.

● Routine maintenance or replacement parts to
repaired or modi ed by persons not authorised by

comply with the requirements of the TMV2 or

repaired or modi ed by persons not authorised by

TMV3 healthcare schemes

● Accidental or wilful damage.

● Products purchased ex-showroom display.

What to do if something goes wrong

If your product does not work correctly refer to this
manual for fault diagnosis and check that it is installed
and commissioned in accordance with our instructions.
If this does not resolve the issue, contact us for help
and advice.

Helpdesk Service

Contact our Customer Services Team for

product advice, to purchase spare parts or
accessories or to set up service visit. You can contact
us via phone or e-mail - contact details below.
Please provide your model name, power rating (if

applicable) and date of purchase.

Mira Showers Website

(www.mirashowers.co.uk)

Visit our website to register your guarantee,
download user guides, diagnose faults, purchase
our full range of accessories and popular spares, or
request a service visit.

Spares and Accessories

We hold the largest stocks of genuine Mira

spares and accessories.Contact us for a
price or visit our website to purchase items from our
accessory range and popular spares. (Only available

in the United Kingdom )

Service/Repairs

No one knows our products better than our

nationwide team of Service Technicians. We
can carry out service or repair work to your product
both during and after the guarantee period. (Only
available in the United Kingdom and Republic of

Ireland) Ask about our  xed price service repairs.

0800 001 4040

Fax: [phone]

Email – Visit

www.mirashowers.co.uk/contactus

By Post: Mira Customer Services Dept, Cromwell
Road, Cheltenham, Gloucestershire GL52 5EP

To Contact Us: Eire Only

01 531 9337

E-mail:

[e-mail]

To Contact Us: UK