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INSTALLATION & USER GUIDE
These instructions must be left with the user.
THERMOSTATIC BAR VALVE
MIRA ATOM EV
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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 Atom thermostatic bar valve is a
thermostatic shower control designed for wall
mount installations.
The thermostatic bar valve has two knobs, one
knob controls the ow and the other knob controls
the temperature.
The Mira Atom EV is supplied complete with Mira
L14A Shower Fittings.
The thermostatic bar valve incorporates a wax
capsule temperature sensing unit, which provides
an almost immediate response to changes in
pressures or temperature of the incoming water
supplies, to maintain the selected temperature. An
adjustable maximum temperature stop is provided
which limits the temperature to a safe level.
Inlet lters are tted to protect the thermostatic
cartridge.
Guarantee
For domestic installations, Mira Showers
guarantee the Mira Atom against any defect in
materials or workmanship for a period of three
years from the date of purchase (shower ttings
for one year).
For non-domestic installations, Mira Showers
guarantee the Mira Atom against any defect 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 with
Fittings
Domestic
ü
Light Commercial
ü
Heavy Commercial
û
Healthcare
û
Design Registration
000793401-0001-0003
CONTENTS
Introduction 2
Guarantee 2
Recommended Usage 2
Design Registration 2
Safety Warnings 3
Pack Contents 3
Specications 4
Pressures 4
Temperatures 4
Thermostatic Shut-down 4
Connections 4
Dimensions 4
Installation 5
Suitable Plumbing Systems 5
General 5
Installing the Thermostatic Mixer 6
Commissioning 7
Maximum Temperature Setting 7
Operation 8
Adjusting the Temperature 8
Adjusting the Flow 8
User Maintenance 8
Fault Diagnosis 8
Lubricants 9
Cleaning 9
Filters 9
Maintaining the Non-Return Valves 9
Spare Parts 10
Notes 11
Customer Service Back Page
If you experience any difficulty with the
ins tallati on o r op era tion of your new
thermostatic mixer, please refer to ‘Fault
Diagnosis’, before contacting Kohler Mira Ltd.
Our contact details can be found on the back
cover of this guide.
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SAFETY WARNINGS
Mira thermostatic mixers are precision engineered
and should give continued safe and controlled
performance, provided:
1. They are installed, commissioned, operated
and maintained in accordance with the
manufacturer’s recommendations.
2. 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 difculty understanding
or operating the controls of any shower should
be attended whilst showering. Particular
consideration should be given to the young,
the elderly, the inrm or anyone inexperienced
in the correct operation of the controls.
6. Rapid/Excessive movement of the ow and/
or temperature control levers may result in
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 conrm that all of the
parts are included.
q 2 x Concealing Plates
q 2 x Inlet Connectors
q 2 x Washers / Filters
Documentation
q 1 x Guarantee Registration Document
q 1 x Mira Atom
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SPECIFICATIONS
Pressures
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 showerhead outlet).
Temperatures
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 Differential between Hot Supply and •
Outlet Temperature: 10°C.
Cold Water Range: • 5°C - 25°C.
Thermostatic Shut-down
For safety the thermostat will shut off the •
hot supply within 2 Seconds if the cold
supply fails (achieved only if the hot supply
temperature is greater than 10°C above the
set blend temperature).
Connections
Hot: Left • (side nearest ow control), ½” BSP
Male.
Cold: Right • (s ide nearest temper ature
control), ½” BSP Male.
Outlet:• bottom, ½” BSP Male to flexible
hose.
Note! This product does not allow for reversed
inlets and will deliver unstable temperatures if
tted incorrectly.
Offset connector (inlet centres are 150 mm
± 24 mm).
½" BSP
Connection to Pipework
¾" BSP
Connection to Bar Valve
Dimensions
150 ± 24 100 Min to Wall100 Min to Wall
Ø70
Dimensions in mm
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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
Installation must be carried out in accordance
with these instructions, and must be conducted by
designated, qualied and competent personnel.
The installation must comply with the “Water
Supply Regulations 1999 (Water Fittings)” or any
particular regulations and practices, specied by
the local water company or water undertakers.
Note! Make sure that all site requirements
correspond to the information given in section:
‘Specications’.
1. The mixer must not be installed in an area
where it may freeze.
2. For stud partitions alternative xings may be
required.
3. 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
between the spill-over level of the shower tray/
bath and the showerhead (refer to illustration).
This is to prevent back-siphonage.
Note! Only use shower ttings recommended
by the manufacturer or supplier.
25 mm
Spill Over
Level
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Installing the Thermostatic Mixer
The thermostatic bar valve should be installed
where it will be supported by xed pipework. For
unxed pipework a wall mounting bracket must
be used (available as a spare part, part number:
1663.257, contact Customer Services).
1. Install the pipework, making sure that it is set
at the correct distance apart (150 ± 24 mm)
andsolidlyxed.
2. Apply suitable thread sealant (not supplied)
and attach the offset connectors to the
pipework in the wall. The offset connectors
must protrude between 26 and 30 mm from
the nished wall.
Note! Connections are: Hot-Left, Cold-Right.
This is very important as this product does not
allow for reversed inlets.
Spirit Level
Offset
Connector
Wall
Tile
Pipework
Support
Bracket
150 mm
½" BSP Female
Connection
Apply Silicone
Sealant to seal
hole in wall
26 - 30 mm
3. Tighten the offset connectors using a spanner
on the spanner flats. Make sure that the
connectors are level and set at the correct
distance apart, using the bar valve as a guide
to spacing.
Concealing Plates
Spanner Flats
150 ± 24 mm
Hot
Cold
4. Screw the concealing plates onto the offset
connectors until they come into contact with
the wall.
5. Caution! Make sure that the supply pipework
is ushed before installing the Bar Valve.
Assemble the bar valve with a sealing washer/
lter in each inlet and attach to the offset
connectors.
Note! Connections are: Hot-Left, Cold-Right.
Sealing
Washer / Filter
6. Tighten the connections using a suitable
spanner.
7. Install the shower ttings, refer to the shower
ttings Installation and User Guide.
8. Turn on the hot and cold water supplies and
check for leaks.
9. Before using the shower, refer to section:
‘Commissioning’.
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COMMISSIONING
Maximum Temperature Setting
Before using the shower the maximum temperature
must be checked to make sure that it is at a safe
level. It has been preset to a safe showering
temperature under ideal conditions at the factory,
appropriate for most systems. However, site
conditions and personal preference may make it
necessary to reset this temperature.
Note! Make sure that the hot water temperature is
at least 55°C and that there is sufcient supply.
Caution! Before testing the mixer, make sure
that the hot and cold water is owing correctly by
exercising the temperature selector knob between
the cold and hot stops.
1. Turn the temperature selector knob to position
7 and test that the temperature of the water
from the shower outlet is hot enough.
2. If not, depress the override button and
carefully rotate towards position 9. If the water
temperature is still not hot enough complete
the following procedure.
3. Rotate the temperature selector knob back to
position 7.
4. Using a suitable screwdriver carefully prise
off the concealing cap and unscrew the xing
screw.
5. Pull off the temperature selector knob without
disturbing the stop assembly.
Fixing Screw
Concealing Cap
Temperature
Selector Knob
6. Replace the temperature selector knob so that
the 6 mark is in line with the stop assembly.
7. Rotate the temperature selector knob to
position 7, wait for the water to stabilise and
test that the temperature of the water from the
shower outlet is hot enough.
If the water temperature is still not hot enough
repeat the procedure until a maximum safe
temperature is achieved at position 9.
8. Ret and tighten the xing screw, ret the
concealing cap.
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USER MAINTENANCE
If you require a Mira trained service engineer or
agent, refer to section: ‘Customer Services’.
Fault Diagnosis
Symptom:
Only hot or cold water from the mixer outlet.•
Outlet temperature too hot / too cold.•
Cause/Rectication:
Inlets reversed (hot supply to cold supply). •
Rework inlet pipework.
No hot or cold water reaching the mixer.•
Checktheltersforanyblockage.•
Installation conditions outside operating •
parameters,refertosections:‘Specications’
and‘Commissioning’.
—————————————
Symptom:
Fluctuatingorreducedowrate.•
Cause/Rectication:
Check the showerhead, hose and lters for•
anyblockage.
Make sure that the maintained inlet pressures •
arenominallybalancedandsufcient,referto
section:‘Specications’.
Mak e sur e that the inlet tem per atu re •
differentials are sufcient, refer to section:
‘Specications’.
Airlockorpartialblockageinthepipework.•
—————————————
Symptom:
Water leaking from showerhead.•
Cause/Rectication:
Normal for a short period after shut off.•
Check that the pressures are not in excess of •
thespecicationsfortheproduct.
Cartridge inlet seals damaged, renew.•
Renew the thermostatic cartridge.•
OPERATION
Adjusting the Temperature
The temperature is controlled by rotating the
temperature knob.
For safety reasons, the temperature is limited by
an override stop. To obtain a higher temperature,
press the override button on the temperature knob
and continue to rotate.
+
-
Adjusting the Flow
The ow is controlled by rotating the ow knob.
ON
OFF
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Lubricants
Silicone based lubricants must only be used on
the rubber seals.
Caution! Oil based or other lubricant types may
cause rapid deterioration of seals.
Cleaning
The chrome plated parts should be cleaned using
a mild washing up detergent or soap solution,
rinsed and then wiped dry with a soft cloth.
Warning! Many household cleaners contain
abrasive and chemical substances, and should not
be used for cleaning plated or plastic ttings.
Do not use descalents on this product.
Filters
The sealing washers / lters are located in the inlet
connector. Clean or renew as necessary.
Maintaining the Non-Return Valves
The non -return valves ar e locat ed in t he
thermostatic bar valve body, and are accessible
through the inlet connectors.
Caution! Make sure that the non-return valves
are installed correctly to prevent crossow or
malfunction of the valve.
1. With the water supplies turned off and the
thermostatic bar valve removed, remove the
sealing washer / lter.
2. Unscrew the non-return valve housing using
a 12 mm hexagonal wrench.
Note! The non-return valve housing has a Left
Hand Thread, turn clockwise to unscrew.
3. Carefully remove the non-return valve and
clean any debris.
4. On re-assembly make sure that the non-return
valve is tted the correct way round (with the
arrow indicating the ow pointing towards the
valve).
Sealing Washer / Filter
Inlet Connector /
Non-Return Valve Housing
Non-Return
Valve
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SPARE PARTS
1630.049
Filter / Washer (x2)
Note! All spare parts are supplied
individually unless stated otherwise.
1630.048
Outlet Connector
1663.118
Flow Knob Assembly
1663.117
Flow Cartridge
1663.112
Offset Connector Kt (x2)
1663.113
Non Return Valve (x2)
1663.116
Temperature Knob
Assembly
1663.115
Temperature Stop
Assembly
1663.114
Thermostatic Cartridge
1663.257
Wall Mounting Bracket Pack
Optionalspareparttoallowxingtostudpartition
orunxedrearentrypipework.
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NOTES
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1
Guarantee of Quality
Mira Showers guarantee your product against any defect
in materials or workmanship, provided that it is installed
and maintained in accordance with the instructions given
in this guide.
To validate the guarantee, please return your completed
registration card within 30 days of product installation.
Within the guarantee period we will resolve defects, free
of charge, by repairing or replacing parts or modules as
we may choose.
To be free of charge, service work must only be undertaken
by Mira Showers or our approved agents.
Service under this guarantee does not affect the expiry
date of the guarantee.
The guarantee on any exchanged parts or product ends
when the normal product guarantee period expires.
Not covered by this guarantee:
Planned maintenance, or replacement parts required to
comply with the servicing requirements of the TMV 2 and
TMV 3 healthcare schemes (where applicable).
Damage or defects arising from incorrect installation,
improper use or lack of maintenance, including build-up
of limescale.
Damage or defects if the product is taken apart, repaired or
modifi ed by any persons not authorised by Mira Showers
or our approved agents.
This guarantee is in addition to your statutory and other
legal rights.
What to do if something goes wrong
If when you first use your shower, it doesn’t function
correctly, fi rst contact your installer to check that installation
and commissioning are satisfactory and in accordance with
the instructions in this manual. We are on hand to offer you
or your installer any advice you may need.
Should this not resolve the diffi culty, simply contact our
Customer Services Team who will give every assistance
and, if necessary, arrange for our service engineer to
visit. If the performance of your shower declines, consult
this manual to see whether simple home maintenance is
required. Please call our Customer Services Team to talk
the diffi culty through, request a service under guarantee
if applicable, or take advantage of our comprehensive
After-Sales service.
As part of our quality and training programme calls may be
recorded or monitored.
Our Customer Services Team is comprehensively trained to
provide every assistance you may need: help and advice,
spare parts or a service visit.
Spare Parts
We maintain an extensive stock of spares and aim to provide
support throughout the product’s expected life.
Genuine Mira spares can be purchased direct from
Customer Services or from approved stockists or merchants
(locations on request).
Spare parts will normally be despatched within two working
days. Payment can be made using most
major Credit or
Debit cards at the time of ordering. Should payment by
cheque be preferred, a pro-forma invoice will be sent.
All spares are guaranteed for 12 months from date of
purchase. Spares that have been supplied directly from us
can be returned within one month from date of purchase,
providing that they are in good order and the packaging
is unopened.
Note! Returned spares will be subject to a 15% restocking
charge and authorisation must be obtained before return.
Please contact our Customer Services Team.
Note! In the interests of safety, spares requiring exposure to
mains voltages must only be fi tted by competent persons.
Service / Repairs
Our Service Force is available to provide a quality service
at a reasonable cost. Yo u will have the assurance of a Mira
trained engineer/agent, genuine Mira spare parts and a
12 month guarantee on the repair.
Payment should be made directly to the engineer/agent who
will accept most major Credit or Debit cards or a cheque
supported by a banker’s card.
To Contact Us
England, Scotland, Wales and Northern Ireland
Mira Showers Customer Services
Telephone: 0870 241 0888, Mon to Fri 8:00 am - 5:30 pm
Sat 8:30 am - 3:30 pm
E-mail: technical@mirashowers.com
Fax: 01242 282595
By Post: Cromwell Road, Cheltenham,
Gloucestershire, GL52 5EP
Eire
Modern Plant Ltd (Dublin)
Telephone: 01 459 1344, Mon to Fri 9:00 am - 5:00 pm
E-mail: sales@modernplant.ie
Fax: Dublin 01 459 2329
Post: Otter House, Naas Road,
Clondalkin, Dublin 22
Modern Plant (Cork)
Telephone: 021 496 8755, Mon to Fri 9:00 am - 5:00 pm
E-mail: cork@modernplant.ie
Fax: 021 496 8607
Post: Tramore Road, Cork
Mira is a registered trade mark of
Kohler Mira Limited.
The company reserves the right to alter
product specifi cations without notice.
www.mirashowers.com
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CUSTOMER SERVICE
1082174-W2-B (H04B) (1663) © Kohler Mira Limited, July 2008
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