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Mira Atom EV Thermostatic Bar Valve
These instructions must be left with the user
Installation and User Guide
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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.
Guarantee
For domestic installations, Mira Showers guarantee the Mira Atom
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 the Mira
Atom 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'.
Design Registration & Patents
Design Registration: GB 001225254-0003
Patents: GB 2 407 138
Recommended Usage
Domestic
Light Commercial
Heavy Commercial
Healthcare
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Pack Contents
Mira Atom Exposed Varriable
Bar Valve
1 x Exposed Varriable
Bar Valve
2 x Wall Brackets
1 x Handset
2 x Olives
2 x Compression Nuts
2 x Concealing Plates
2 x Hose Seal
Exposed Varriable Bar Valve Fitting
2 x Mounting Pack
Components
2 x Cap
2 x Slide Bar
Support
1 x Hose
1 x Clamp
Bracket
2 x Washers/Filters
2 x Wall Plugs
2 x Fixing Screws
1 x Slide Bar
1 x Hose
Retaining Ring
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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:
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 and retain this guide for later use.
2. Installation must be carried out in accordance with these
instructions, and must be conducted by designated, qualied and
competent personnel.
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. Make sure that you fully understand how to operate this shower
before use, read all operating instructions and retain this guide
for future reference.
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6. This product is not intended for use by persons (including children)
with reduced physical, sensory or mental capabilities, or lack
of experience and knowledge, unless they have been given
supervision or instruction concerning the use of the product by a
person responsible for their safety.
7. Children should be supervised to ensure that they do not play with
the product.
8. DO NOT perform any unspecied modications to the shower
or its accessories. When servicing only use genuine Kohler Mira
replacement parts.
9. DO NOT t any form of outlet ow control. Only Mira recommended
outlet ttings should be used.
10. DO NOT operate the temperature control rapidly, allow 10 – 15
seconds for the temperature to stabilise before use.
11. Care is required when adjusting ow or temperature, make sure
that the temperature has stabilised.
12. Care is required if the product is turned off and back on during
showering as this may result in unstable temperature. Ensure
temperature has stabilised before re-using product.
13. Sunburn or skin conditions can increase your sensitivity to hot
water. Make sure that you set the shower to a cooler temperature.
14. The water supplies to this product must be isolated if the product is
not to be used for a long period of time. If the product or pipework
is at risk of freezing during this period they should also be drained
of water.
15. 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.
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Specication
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 shower handset 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 Recommended Differential between Hot Supply and Outlet
Temperature: 12°C at desired ow rates.
• Minimum hot water supply temperature: 55°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
• Hot: Left - 15mm pipework, 3/4” BSP to valve.
• Cold: Right - 15mm 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 tem-
peratures if tted incorrectly.
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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
1. Installation of the shower must be carried out in accordance with these
instructions by qualied, competent personnel.
2. 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.
3. Make sure all pressures and temperatures comply with the requirements of the
shower. See ‘Specications’.
4. The product must not be installed in an area where it may freeze. Pipework to
the product that could become frozen must be properly insulated.
5. DO NOT install the product in a position in which service access is restricted.
6. For stud partitions alternative xings may be required.
7. Isolating valves must be installed close to the product for ease of maintenance.
8. Pipework must be rigidly supported and avoid any strain on the connections.
9. Pipework dead-legs should be kept to a minimum.
10. If pipework enters the product from the rear through a hole in the wall, provision
must be made to prevent water ingress back into the wall structure.
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11. The position of the shower and shower ttings must provide a minimum gap of
25 mm between the showerhead and the spill over level of any bath, shower
tray or basin and a minimum gap of 30 mm between the showerhead and the
spill over level of any toilet, bidet or other appliance with a Fluid Category 5
backow risk (see diagram).
Mixer
Shower
Zone of
Backflow 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
30 mm
Minimum
25 mm Minimum
25 mm
Minimum
(0.1 bar). Double checkvalves tted
in the inlet supply to the appliance
cause a pressure build up, which
affect the maximum static inlet
pressure for the appliance and must
not be tted. For Fluid category 5,
double checkvalves are not
Toilet or Bidet
FC5
Bath or Shower
Tray FC3
Hand Basin
FC3
suitable.
12. The showerhead should be positioned so that it discharges down the centre
line of the bath or across the opening of a shower cubicle.
13. Only use the inlet connections supplied with the product. DO NOT use any
other type of ttings.
14. All pipework must be checked for leaks before the product installation is
completed. The product should be pressurised & the inlet & outlet connections
inspected.
15. DO NOT overtighten connections, screws or grubscrews as product damage
may occur.
16. Upon completion of installation, or if the product is dismantled during installation
or servicing, then the product must be inspected to ensure that there are no
leaks.
17. Having completed the installation, make sure that the user is familiar with the
operation of the product.
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Installation of the Bar Valve
Before installing the pipework, please ensure that there is a minimum of
1065mm 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.
1
COLD
HOT
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.
Plastic Pipe
Guide
Make sure that the pipework has been
installed correctly and that it protrudes
25 mm from the nished wall surface.
3 4
Wall Bracket
2
25 mm
25 mm
Hold the wall bracket in position and
mark the position of the xing holes.
8 mm
Drill the xing holes using an 8 mm
diameter drill.
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5
6
Install the wall plugs.
7
Install the olives and the connectors.
Tighten nger tight and then another
1/4 to 1/2 turn.
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Install the xing screws and tighten.
8
Turn on the water supply and ush the
pipework.
10
Install the concealing plates.
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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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Installing the Shower Fittings
1 2
Ø 8 mm
xing centres 510 mm
For new installations optimum
Ø 8 mm
4
5
3
6 7
remove red
protective cover
or white label
before tting
Note! Ensure an
equal length of slide
bar top and bottom
Connecting the Shower Hose
The Mira Universal Shower Hose has slightly different sized conical connections
8
at each end (the smaller diameter / longer length conical is identied with a
Red protective cover or White label).
The end with the red cover or white label connects to the showerhead, the clear
end connects to the valve.
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Commissioning
Temperature
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 anticlockwise until it stops 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 the knob further. If the
water temperature is still not hot enough complete the following procedure.
3. Rotate the temperature selector knob back to the override position.
4. Push in and rotate the concealing cap clockwise to remove. Remove the xing
screw.
5. Pull off the temperature selector knob without disturbing the stop assembly.
6. Replace the temperature selector knob so that the lever is the 1 O'clock position.
7. Rotate the temperature selector knob against the stop, 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 the override position.
8. Ret and tighten the xing screw, ret the concealing cap.
Selector Knob
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Stop Assembly
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Push in and
rotate to remove
Concealing Cap
Fixing Screw
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Operation
Flow Selector Knob
Decrease
e
Temperature
Override
Button
OFF
ECO
ON
Temperature
Increase
Temperatur
Temperature
Selector Knob
Adjusting the Temperature
The temperature is controlled by rotating the temperature selector knob.For
safety reasons, the temperature is limited by an override stop. To obtain a higher
temperature, press the override button on the temperature selector knob and continue
to rotate the knob.
Adjusting the Flow
The ow is controlled by rotating the ow selector knob.
The ECO mode provides an economic ow rate to save water, to get FULL FLOW
push the button in and continue to rotate.
Adjusting the Flow
The adjustable showerhead has four different spray actions.
1. To select any of the four spray actions, turn the spray plate anticlockwise
from the full clockwise position until it clicks once.
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Cleaning
Cleaning
Many household cleaners contain abrasives and chemical substances, and should not
be used for cleaning plated or plastic ttings. 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 and showerhead continue
to perform to their maximum. A blocked showerhead can restrict the ow rate and
may cause damage to your shower.
Fault Diagnosis
If you require a Mira trained service engineer or agent, refer to ‘Customer Service’.
Symptom Cause / Rectication
Water too hot or
too cold
Poor temperature
control
Fluctuating or
reduced ow
Water leaking
from the shower
handset/overhead
Inlets reversed (hot supply to cold supply).Rework inlet
pipework.
Check lters for any blockage.
Check the maximum temperature setting (If you have a
combination type boiler it may not be producing sufcient
hot water at the desired ow rate). Fit a ow regulator to the
shower valve outlet.
Installation conditions outside operating parameters. Refer
to Specications and Commissioning.
Make sure that the inlet temperature differentials are
sufcient, refer to ‘Specications’.
Check the shower handset, hose and lters for any
blockage.
Set at Eco position. Press the override button and rotate
the knob.
Make sure that the maintained inlet pressures are
nominally balanced and sufcient. Refer to Specications.
Air lock or partial blockage in the pipework.
Normal for a short period after shut off.
Check that the pressures are not in excess of the
specications for this product.
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Spare Parts
)
1836.171
1836.179
Fixing Kit
Concealing Plates
1703.194
Mounting Pack
Components ‘A’
632.73
Hose Seal (x2)
1703.196
Cap (x2)
1703.510
Slide Bar
Support (x2)
1703.203
Clamp Bracket
1703.554
Beat 110
Multi Mode
Showerhead (x1
1836.165
Flow Knob
Assembly
1836.181
Flow
Cartridge
1836.174
Inlet Seal/
Filter
1744.108
Thermostatic
Cartridge
1836.163
Cartridge
Nut
A
1836.164
Temperature
Knob Assembly
1703.199
Hose Retaining
Ring
1703.128
Slide Bar
(660 mm)
150.58
Hose (1.25 M)
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Customer Service
Guarantee
Your product has the benefit of our manufacturer’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 0800 5978581 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 fittings 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 filters) 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 modified by persons not authorised by
us or our appointed representative.
●
Routine maintenance or replacement parts to
repaired or modified by persons not authorised by
comply with the requirements of theTMV2 or
repaired or modified 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 Te am 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 a ccessories.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 Te chnicians. 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
Ireland) Ask about our fixed price service repairs.
To Contact Us: UK
0844 571 5000
Calls cost 7p per minute plus your phone company’s
access charge
Fax: 01242 282595
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:
CustomerServiceEire@mirashowers.com
of
Mira is a registered trade mark of
Kohler Mira Limited.
The company reserves the right to alter
product specifications without notice.
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© Kohler Mira Limited, February 2018
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