Mira Mira Activate Series User manual

Mira Activate
Digital Shower
Installation and User Guide
Please leave these instructions with the user
1399980

Thank you for purchasing a Mira Activate. To enjoy the full potential of
your new product, please take time to read this guide thoroughly, and
having done so, keep it handy for future reference. For step-by-step
installation videos, datasheets or spares information, please visit the
Mira Showers website.
Contents
Important Safety Information 4
Pack Contents 6
Guarantee 10
Recommended Usage 10
Products Covered 10
Specications 11
Suitable Plumbing Installations 13
Showering Maximum Flow Rate 15
Installation Schematic 16
General Installation 17
Installation
Digital Mixing Valve 18
Ceiling Fed Shower Fittings 22
Rear Fed Shower Fittings 25
Deluge Overhead 28
User Controller 32
Commissioning &
Starting the shower 35
User Controller: Features 40
Set Up: Mobile App 42
Fault Diagnosis 43
Cleaning & Maintenance 48
Back Page 52

3
1. Installation of this product must be carried out in accordance
withtheseinstructionsbyqualied,competentpersonnel.Read
all instructions before commencing installation.
2. The electrical installation must comply with BS 7671 (commonly
referred to as the IET Wiring Regulations) and all relevant
building regulations, or any particular regulation or practice
speciedbythelocalelectricitysupplycompany.
3. 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.
4. Isolate the electrical and water supplies before commencing
installation.
5. For any copper pipework ensure supplementary bonding is
provided in accordance with the wiring regulations.
6. A 30mA Residual Current Device (RCD) must be included in the
electrical circuit. This may be part of the consumer unit or a
separate unit.
7. DO NOT install the digital mixing valve or user controller in areas
with high humidity and temperature (e.g. steam rooms and
saunas).
Important Safety Information
Products manufactured by Kohler Mira Ltd. are designed to be safe, provided that they are
installed, used and maintained in good working order, in accordance with our instructions
and recommendations. Follow all warnings, cautions and instructions contained in this guide,
and on, or inside the product. Failure to follow the instructions provided with this product
will invalidate the guarantee.
WARNING! To reduce the risk of re, electric shock or injury please read the impor tant
information listed below.

4
8. DO NOTinstallthedigitalmixingvalveorttingswheretheymay
be exposed to freezing conditions. Ensure that any pipework
that could become frozen is properly insulated.
9. DO NOTperformanyunspeciedmodications,drillorcutholes
in the product other than instructed by this guide. When servicing
only use genuine Kohler Mira replacement parts.
10. If the product is dismantled during installation or servicing then,
upon completion, an inspection must be made to ensure all
electrical connections are secure and that there are no leaks.
11. DO NOT operate the product if water is leaking from inside the
valve module. Isolate electrical and water supplies to the product
and refer to the fault diagnosis section.
12. DO NOT operate the product if it is thought to have been exposed
to freezing conditions. Isolate electrical and water supplies to
the product and contact Kohler Mira Ltd.
13. Make sure that you fully understand how to operate this shower
and make sure that it is properly maintained in accordance with
the instructions given in this manual.
14. This product 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 the use of the
appliance in a safe way and understand the hazards involved.
15. DO NOT allow children to play with the product.
16. DO NOT allow children to clean or perform any user maintenance
without supervision.
17. Children under 8 must be supervised when bathing or showering.
18. The water temperature needs to be set at a suitable temperature
(body temperature is approximately 38°C). Babies and Children
are more sensitive to temperature than adults and it is
recommended to check the delivered water temperature is less
than 37°C.

5
19. The maximum mixed water temperature from the product is
48°C to take into account losses in metal baths. It is not a safe
bathing or showering temperature.
20. Always check the water temperature is safe before bathing or
showering.
21. DO NOT remotely operate or alter any of this product’s shower
and bathing settings if it is already occupied and / or being used
by another person.
22. DO NOT use excessive force when making connections.
23. Avoid layouts where the shower hose will be sharply kinked.
This may reduce the life of the hose.
24. Thepositionoftheshowerttingsmustprovideaminimumair
gap of 25mm between the handshower and the spill over level of
any bath, shower tray or basin. There must be a minimum
distance of 30mm between the handshower and the spill over
level of any toilet, bidet or other appliance with a Fluid Category
5backowrisk.
25. DO NOT operate the valve at voltages other than that stated on
the rating label.
26. This appliance is only to be used and supplied at SELV (Safety
Extra Low Voltage) using only the supplied detachable power supply
unit.
27. The supply cord of the power supply unit cannot be replaced. If
the cord is damaged the power supply must be replaced.
28. In the event of a cold water failure, the product is designed to
reducetheow.Dependingonthetemperatureofthehotwater,
the valve may shut down to prevent scalding.

6
Pack Contents
Digital Mixing Valve
Digital Mixing Valve Pumped/Gravity
2 x Push-Fit Isolators
1 or 2 x Outlet Connector
(Depending on number
of outlets)
3 x Wall Plugs
3 x Fixing Screws
2 x Pozi Screws
(3.5 x 12mm)
2 x Fixing Feet
2 x Fixing Feet
2 x Push-Fit Isolators
1 - 2 x Outlet Connector
(Depending on number
of outlets)
3 x Wall Plugs
3 x Fixing Screws
1 x Power Supply
Digital Mixing Valve
1 x Power Supply
Digital Mixing Valve High Pressure/Combi
2 x Pozi Screws
(3.5 x 12mm)

7
Ceiling Fed Shower Fitting
1 x Elbow q
4 x Wall Plugs q
4 x Fixing Screws q
1 x Slide Bar Assembly q
1xUserController(tted) q
2 x Wall Spacers & 4 Long Fixing
Screws (Optional Fitment) q
1 x Hose q
2 x Rubber Washers q
1 x Handset q
Digital Mixing Valve High Pressure/Combi

8
2 x Cover Cap q
1 x Handset q
1 x Controller Cable q
2 x Locking Screw q
1 x Slide Bar
Assembly q
4 x Wall Plugs q
2 x Wall Plugs q
4 x Fixing Screws q
1 x Hose q
2 x Rubber Washers q
2 x Fixing Screws q
1 x User Controller q
2 x Mounting Brackets q
Rear Fed Shower Fitting
1 x RAC
Assembly q

9
Overhead Fitting Kit (Dual Outlet models only)
1 x Backplate Assembly q
1 x Deluge Overhead q
1 x Shower Arm q
Note: For rear fed, choose the length of the
showerarmandcuto󰀨straightend.
For ceiling fed, choose the length of the
shower arm and cut o󰀨 bent end using a
22 mm stainless steel pipe slice, or hack saw.
4 x Wall Plugs q
4 x Fixing Screws q

10
Guarantee
The Mira Activate has been designed for domestic use only, it is not recommended for
Commercial or Healthcare use. For domestic installations, Kohler Mira Ltd. guarantee the
MiraActivate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, Kohler Mira Ltd. guarantee the Mira Activate against any
defect in materials or workmanship for a period of one year from the date of purchase.
Your guarantee is only valid if you follow the guidance within this installation and
user guide, including the `Cleaning and Maintenance’ section.
Products Covered
Domestic 
Light Commercial 
Heavy Commercial 
Healthcare 
Recommended Usage
Product Name Product No.
Mira Activate Ceiling Fed (High Pressure) 1.19 03.0 86
Mira Activate Rear Fed (High Pressure) 1.19 03.087
Mira Activate Dual Ceiling Fed (High Pressure) 1.19 03.088
Mira Activate Dual Rear Fed (High Pressure) 1.19 03.089
Mira Activate Ceiling Fed (Pumped) 1.1903.090
Mira Activate Rear Fed (Pumped) 1.19 03.091
Mira Activate Dual Ceiling Fed (Pumped) 1.1903.092
Mira Activate Dual Rear Fed (Pumped) 1.19 03.093

11
Specications
Standards and Approvals
The Mira Activate complies with all relevant directives for CE marking. The Mira Activate is
a type 1 electronic, independently mounted control for surface mounting. Mira Activate is a
thermostatic water mixing valve.
General
Pollution Degree 2
Rated Impulse Voltage 2.5 kV
Connections 15mmpusht
Suitability for Drinking Water Applications Not suitable
Solenoid Type Pilot operated
Water Connection Type Permanent
Mira Digital Mixing Valve High Pressure/Combi (not suitable for pumped gravity systems)
Pressures
Thermostatic Standard TMV 2 - HP (BS EN 1111 Type 2)
Maximum Static Pressure 1000 kPa (10 bar)
Maximum Maintained Pressure 500 kPa (5 bar)
Minimum Maintained Pressure 100 kPa (1 bar)
SupplyPressureDi󰀨erential Nominally equal
Temperatures
Maximum Temperature (setting range) 35°C - 48°C (Factory Preset 45°C)
Minimum Temperature Thermostatic control down to 30°C
Full Cold also selectable
Hot Water Range - Supply 55°C - 65°C
Cold Water Range - Supply 1°C - 20°C
Temperature Stability at Valve Outlet ± 1°C at recommended supply conditions
Ambient Temperature 1°C - 50°C
Maximum Relative Humidity 95% non-condensing at 30°C
Flow Rates
Nominal Flow Rate Valve capable of up to 16 l/min @ 1 bar
Electrical Rating
Supply Voltage 100V - 240V AC 50/60Hz
Maximum Load 38W
Output Supply Voltage to Valve 12V DC

12
Mira Digital Mixing Valve Pumped/Gravity (not suitable for mains pressure systems)
Note: The pump in this product is not suitable for dry running. It is essential you
follow the commissioning sequence detail in this guide.
Note: Valves operating outside of the manufacturers recommended conditions of
use cannot be guaranteed to operate as TMV2 Type 2 valves.
Pressures
Thermostatic Standard TMV 2 - HP (BS EN 1111 Type 2)
Maximum Static Pressure 100 kPa (1 bar) 10m head
Maximum Maintained Pressure 100 kPa (1 bar) 10m head
Minimum Maintained Pressure 1 kPa (0.01 bar) 0.10m
SupplyPressureDi󰀨erential Nominally equal
Temperatures
Maximum Temperature (setting range) 35°C - 48°C (Factory Preset 45°C)
Minimum Temperature Thermostatic control down to 30°C
Full Cold also selectable
Hot Water Range - Supply 55°C - 65°C
Cold Water Range - Supply 1°C - 20°C
Temperature Stability at Valve Outlet ± 1°C at recommended supply conditions
Ambient Temperature 1°C - 50°C
Maximum Relative Humidity 95% non-condensing at 30°C
Flow Rates
Nominal Flow Rate* Valve capable of up to 12 l/min @ 0.1 bar
Electrical Rating
Supply Voltage 100V - 240V AC 50/60Hz
Maximum Load 80W
Output Supply Voltage to Valve 12V DC & 24V DC
User Control
Electrical Supply 12V DC SELV 2W Max
Ingress Protection IPX5
Maximum Ambient Temperature 40°C

13
Suitable Plumbing Installations
Digital Mixing Valve (High Pressure/Combi)
1. Combination boiler systems - the digital high pressure/combi shower can be installed
with an instantaneous combination boiler.
2. Unvented mains pressurised system - the digital high pressure/combi shower can be
installed with an unvented, stored hot water cylinder system.
3. Mains pressurised instantaneous hot water heater - the digital high pressure/combi shower
can be installed with systems of this type with balanced pressures.
Caution: High pressure mixing valves must never be plumbed to gravity systems. This
includes mixed gravity and mains pressure e.g. gravity hot and mains cold. Doing
so will invalidate the warranty and potentially cause product and property damage.
Use of Warm-up Feature with Combination Boilers
When using the warm-up feature (see User Guide) with the digital mixing valve supplied via an
instantaneous water heater/combination boiler, the user may experience a brief temperature
uctuation.Thisiscausedbythenormaloperationofastandardinstantaneouswaterheater/
combinationboilerwherebytheboilerwillturno󰀨whentheowisstopped(as happens
after the warm-up sequence has been completed). Upon restart of the shower, a cold shot
willbeushedthroughfollowedbyabriefhotshotuntilthehotwatersupplyhasstabilised.

14
Digital Mixing Valve (Pumped/Gravity)
1. Gravity fed hot water systems
Caution! Digital pumped/gravity valves must never be plumbed to mains pressure
systems. This includes mixed gravity fed and mains pressure e.g. gravity hot and
mains cold. Doing so will invalidate the warranty and potentially cause product and
property damage.
The shower control must be fed from a cold water storage cistern and a hot water cylinder
providing nominally equal pressures. Pipework layouts and connections must be such that
otherdraw-o󰀨swillnote󰀨ectwatersuppliestotheshower,sharedsuppliesmayleadto
airlocking or water starvation. It is therefore best practice to have independent hot and cold
supplies to the digital mixing valve pumped/gravity.
Cold
Hot
Cistern
Minimum 230 litres
1.0 metre minimum
30° - 60°
Air Separation
Dual Outlet Digital Mixing Valve
(Pumped/Gravity)
Outlet 2
Outlet 1
Outlet 2
Outlet 1
Outlet 1
Cold
Cold
Cold
Hot
Hot
100mm from the
lowest level of the
water in the tank
to the top of the
product.

15
Combination Boilers
Note: The digital mixing valve can demand hot water quicker than some instantaneous
water heaters/combination boilers can provide, especially in winter when the mains
water is colder. It is therefore possible this mixing valve will need to have its outlet
ow rate altered to match the capability of the water system.
Thisdigitalmixingvalvehasbeenfactorypre-setto16l/minoutletowratebutcanbe
altered by use of the Mira Showers app.
HighowratedemandedfromlowkWcombinationboilerswillresultinpoorblendtemperature
stability and could result in your shower going cold. We strongly recommend you to alter the
outletowrateasthetablebelow.
Showering Maximum Flow Rate
Note: The Switch shower handset is ow regulated to 12 l/min. Regardless of
your mixing valve settings or water system capabilities, the ow rate achievable
through this handset is limited to 12 l/min.
Pressurised Unvented System
Thisdigitalmixingvalvehasbeenfactorypre-setto16l/minoutletowrate.Ifsuppliedby
apressurisedunventedsystemitmaybepermissibletoincreasetheoutletowratebyuse
of the Mira Showers app if so desired.
Gravity System
A gravity fed hot water cylinder has a finite amount of stored hot water. A standard
sizehotwatercylinder,e.g.230Litres,withstoredwaterheatedto65˚Cwilltypically
provide a showering duration of 30 minutes when the shower temperature is set to
mid-blend(approximately40˚C)andataflowrateof9l/min.Withtheflowratesetto
12 l/min it will reduce the total showering duration to typically 20 minutes.
Oncethestoredhotwaterhasbeendepleted,su󰀩cienttimewillberequiredforthehotwater
cylinder to reheat its stored water supply before additional showering time can take place.
Thisdigitalmixingvalvehasbeenfactorypre-setto12l/minoutletowratebutcanbe
altered by use of the Mira Showers app.
ItmaybenecessarytoaltertheoutletowrateusingtheMiraShowersappifyourstored
hot water is running out too quickly. Alternatively reduce the outlet flow by decreasing
theowratewiththeusercontroller.
Boiler Rating 24kW (80,000 Btu/h) 30kW (100,000 Btu/h) 36kW (120,000 Btu/h)
Outlet Flow Rate 8 l/min 10 l/min 12 l/min

16
Installation Schematic
Max. Cable
length 9.8m
Max. Cable
length 9.8m

17
Important Installation Considerations
• Ensure pumped/gravity digital mixing valves showers are not connected to any mains
water pressure e.g. stored gravity hot water and cold mains water.
• Highpressure/combidigitalmixingvalvesshouldnotbettedtoagravitysystem.
• The digital mixing valve should not be installed where it can become frozen or be subjected
to ambient temperatures in excess of 50ºC.
• Position the digital mixing valve and power supply so that there is enough room for
maintenance(e.g.removalofthevalvelidandservicingltersthroughremovinginlet
pipework) and make sure safe and easy access is available at all times.
Note: The inlet pipework must be exible enough to allow 25 mm movement to
enable filters to be removed for cleaning and for maintenance of the internal
components. Failure to achieve this may result in service and repair not being
able to be carried out.
• Supplypipeworklayoutmustbearrangedtominimizethee󰀨ectofotheroutletusageas
sharedwatersuppliesmayreduceitsowperformanceuponthedynamicpressuresat
the digital mixing valve inlets.
• Avoid installations where air locking could occur.
• Cold water cisterns should hold no less than 230 litres and hot water cylinders no less
than 210 litres (gravity system only).
• Toeliminatepipedebrisitisessentialthatwatersupplypipesmustbeushedpriorto
connecting the digital mixing valve to the system so debris cannot enter the digital mixing
valve internals.
General Installation
All installations shall comply with the Water Supply (Water Fittings) Regulations 1999.
Safe and easy access to the product should be available at all times.
When installing the product in an area not regularly accessed, consideration for potential
leaks must be taken into account. While such events are unlikely, it is advisable to periodically
check the installation for traces of water on or around the product.
If possible, site the product in a location where any leak would be contained or routed to
avoid areas sensitive to water damage.
Isolatingvalvesmustbeinstalledtobothinlets(supplied)anditisrecommendedtotisolators
on the outlet, close to the digital mixing valve for ease of maintenance.
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.

18
Installation: Digital Mixing Valve
The digital mixing valve may be installed in a loft space, under the bath or in a convenient
cupboard space, provided there is enough room for maintenance (e.g. removal of digital
mixingvalvelidandremovaloftheinletpipeworktoaccesstheinletlters).Failure
to do so may result in an inability to carry out any maintenance.
1
Note: The digital mixing valve (which contains the thermostatic mixing valve) must
be orientated in the positions shown below. Failure to do so will compromise the
ability of the unit to fail-safe and deliver constant blend.
Mounting on a
horizontal surface Mounting on a vertical surface
• Fully commission the product after installation taking care to look for any leaks and correct
operation. For pumped product, follow commissioning instructions.
• The use of supply-line or zone strainers will reduce the need to remove debris at the
digital mixing valve. The recommended maximum mesh aperture dimension for such
strainers is 0.5mm.
• Pipework must be rigidly supported and routed such that it does not cause any strain
on the connectors.
• Long outlet pipework (dead-legs) should be kept to a minimum to avoid temperature
uctuations.
• Cables routed through wall cavities, chased into solid walls, directed under baths or in
loftspacesmustbettedinsuchawaythattheycanlaterberemoved.Tofacilitatethis
appropriate cable conduit/trunking must be used at all times. The conduit/trunking must
be at least 20mm diameter/square to allow for the safe removal of the connectors. Failure
to do so may result in an inability to carry out any maintenance or servicing. Safe and
easy access to the product should be available at all times.
• Theproducthasintegralcheckvalvesforthepurposeofbackowprevention.Thesecan
be replaced if required by following the instructions at the end of this guide.

19
Fit the 2 feet in desired location on digital mixing valve using the two Pozi 3.5 x 12mm
Torx screws supplied.
Note: There are 4 possible locations to install the feet, depending on your
installation constraints.
2
Markthexingholesintherequiredpositionsandsecureusingsuitablexings.
Note: The valve must be installed on a at surface.
3
1335350-6-A
HOT COLD
OUTLET 2 OUTLET 1
IPX4
Max. Static Pressure : 1000kPa (10 Bar)
Max. Working Pressure: 500kPa (5 Bar)
Min. Pressure: 100kPa (1 Bar)
Ambient Temp:5-50 °C
Max. Inlet Supply Temp:65 °C
Product Code: N90A
12V 3.2A
Model: 2 Outlet
System: High Pressure / Combi
Part No.: 1335367
Serial No.: 123456789112345
Date of Manufacture: MM/YYYY
DIGITALMIXING VALVE
Kohler Mira Ltd
Cheltenham GL52 5EP
, UK
Customer Service: 0800 001 4040
Website:www.mirashowers.co.uk
MOUNTING ORIENTATION
Caution! Isolate electrical supply
before removing cover.

20
Connect the hot and cold inlet supply pipework to the digital mixing valve.
Note: The inlet pipework must be exible enough to allow 25 mm movement to
enable lters to be removed for cleaning and for maintenance of the internal
components. Failure to achieve this may result in service and repair not being
able to be carried out.
Isolating valves must be installed to both inlets (supplied) and it is recommended to
tisolatorsontheoutlet,closetothedigitalmixingvalveforeaseofmaintenance.
Note: The direction of arrow on isolation valve to indicates direction of ow.
Run the pipes from the mixed water outlets on the digital mixing valve to the proposed
sitingfortheshowerhoseoutlet,andoverheadxedarm,dependingonthesystem
chosen.
4
Push-fit Isolators
fitted to both Inlets
Push-fit connector to the
shower outlets
Hot Inlet
Cold Inlet
Outlet 1 - Handset
Outlet 2 - Overhead