Mira Orbis User manual

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These instructions are to be left with the user
Installation and User Guide
Mira Orbis Thermostatic Electric Shower

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Contents
Patents and Design Registration..........................................................2
Introduction .............................................................................................3
Important Safety Information .................................................................4
Warning! ............................................................................................... 4
Caution! ................................................................................................ 5
Pack Contents Checklist ........................................................................6
Specications ..........................................................................................7
Installation Requirements ......................................................................7
Installation .............................................................................................10
Installation of Mira Orbis.....................................................................10
Commissioning .....................................................................................14
User Instructions...................................................................................16
Clock Setting ......................................................................................20
Fault Diagnosis......................................................................................22
Heater Settings...................................................................................22
Maintenance...........................................................................................26
Handset - Cleaning.............................................................................26
Inlet Filter - Cleaning/Renewing ......................................................... 26
Clock Battery Replacement Procedure .............................................. 27
Spare Parts ............................................................................................28
Mira Orbis...........................................................................................28
Accessories ...........................................................................................28
Dimensions ............................................................................................30
Wiring Diagram......................................................................................30
Customer Services................................................................................31
Patents and Design Registration
Design Registration 000738141-0002
Patents GB: 2 341 667
Eire: 82835
Patent Applications UK: 2 428 286, 2 427 460
Eire: 2004/0483, 2006/0462

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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 Orbis is a thermostatic electric shower with separate controls for power
selection and temperature/ow adjustment. A unique thermostatic valve stabilises
temperature changes caused by water pressure uctuations. These can result from
taps being turned on or off, or toilets being ushed. A digital display indicates shower
temperature, clock (with battery backup), low ow and over temperature warnings.
The Mira Orbis comes complete with a set of Mira Energise Shower Fittings.
Mira Orbis 9.0 kW
A 9.0 kW 240 V AC (8.2 kW 230 V AC) heater with Mira Energise adjustable spray
handset with four different spray actions (start, soothe, force and eco*). Supplied
complete with exible hose, clamp bracket assembly, slide bar, supports, hose
retaining ring and soap dish. Available in white/chrome.
Mira Orbis 9.8 kW
A 9.8 kW 240 V AC (9.0 kW 230 V AC) heater with Mira Energise adjustable spray
handset with four different spray actions (start, soothe, force and eco*). Supplied
complete with exible hose, clamp bracket assembly, slide bar, supports, hose
retaining ring and soap dish. Available in white/chrome and black/chrome nish.
Mira Orbis 10.8 kW
A 10.8 kW 240 V AC (9.9 kW 230 V AC) heater with Mira Energise adjustable spray
handset with four different spray actions (start, soothe, force and eco*). Supplied
complete with exible hose, clamp bracket assembly, slide bar, supports, hose
retaining ring and soap dish. Available in white/chrome nish.
* The eco setting reduces the water ow to give economical use of water, whilst
still giving an adequate shower performance. This setting performs best with most
gravity, pumped, and mains pressure unvented systems. On electric showers and
some combination boiler systems the economy setting will have no effect, and will
give the same spray action as the start setting.
If you experience any difculty with the installation or operation of your new Electric Shower,
please refer to ‘Fault Diagnosis’, before contacting Kohler Mira Ltd. Our telephone and
fax numbers can be found on the back cover of this guide.

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Important Safety Information
Installation must be carried out in accordance with these instructions, and must be
conducted by designated, qualied and competent personnel.
Warning!
Follow all warnings, cautions and instructions contained in this guide, and
on or inside the appliance.
1. Products manufactured by us are safe and risk-free, provided that they are
installed, used and maintained in good working order, in accordance with our
instructions and recommendations.
2. Isolate the electrical and water supplies before commencing installation. The
electricity must be turned off at the mains and the appropriate circuit fuse
removed, if applicable.
3. Mains connections are exposed when the cover is removed.
4. Refer to the wiring diagram before making any electrical connections (refer to
the wiring diagram at the back of this guide).
5. Make sure that any pipework that could become frozen is properly insulated.
6. Having completed the installation, make sure that the user is familiar with the
operation of the appliance.
7. Make sure that this guide is left with the user.
8. DO NOT commission this appliance if water leaks from the unit or the heater
tank pressure relief valve.
9. DO NOT t any form of outlet control (e.g. Trigger handset) as the outlet acts
as a vent for the tank body. Only Mira recommended outlet ttings should be
used.
10. Make sure all electrical connections are tight, to prevent overheating.
11. The shower unit must not be tted where it may be exposed to freezing
conditions. Make sure that any pipework that could become frozen is properly
insulated. If the appliance appears to be frozen, allow to thaw and then contact
your installer before using again.
12. This product is not suitable for areas with high humidity (i.e steam rooms).
Please consult your installer.
13. THIS APPLIANCE MUST BE EARTHED. MAKE SURE SUPPLEMENTARY
BONDING COMPLIES WITH THE “REQUIREMENTS FOR ELECTRICAL
INSTALLATIONS”.
The installation must be in accordance with the current edition of ’The Plugs
and Sockets etc. (Safety) Regulations’ in force at the time of installation, this
Mira Orbis is intended to be permanently connected to the xed electrical wiring
of the mains system.

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Caution!
1. Read all of these instructions and retain this guide for later use.
2. The electrical installation must comply to “BS 7671 - Requirements for Electrical
Installations”, commonly referred to as the IEE Wiring Regulations - Part 7, or
any particular regulations and practices, specied by the local electricity supply
company.
3. The plumbing installation must comply with the requirements of UK Water
Regulations/Bye-laws (Scotland), Building Regulations or any particular
regulations and practices, specied by the local water company or water
undertakers.
4. 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.
5. Anyone who may have difculty understanding or operating the controls of any
shower should be attended whilst showering. Particular consideration should
be given to:
5.1. The young.
5.2. The elderly.
5.3. The inrm.
5.4. The disabled.
5.5. Anyone who suffers from a medical condition that can result in temporary
incapacity (e.g. epilepsy or blackouts).
5.6. Anyone inexperienced in the correct operation of the controls.
6. Sunburn or skin conditions can increase your sensitivity to hot water. Make
sure that you set the shower to a cooler temperature.
7. If any of the following conditions occur, isolate the electricity and water supplies
and refer to “To contact us”, on the back page of this guide:
7.1. If the cover is not correctly tted and water has entered the appliance
case.
7.2. If the case is damaged.
7.3. If the appliance begins to make an odd noise, smell or smoke.
7.4. If the appliance shows signs of a distinct change in performance,
indicating a need for maintenance.
7.5 DO NOT operate this appliance if water leaks from this appliance.
8. When this appliance 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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Pack Contents Checklist
Mira Orbis
3 x Wall Plugs
3 x Fixing Screws
1 x Mira Orbis
1 x Compression Nut
1 x Olive
2 x Case Inserts
Tick the appropriate boxes to familiarise yourself with the part names and to
conrm that the parts are included.
Documentation
1 x Guarantee Registration Document
1 x Installation Template
1 x Installer Checklist

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Specifications
1. Plumbing
Minimum maintained inlet pressure for 9.0 kW and 9.8 kW, 70 kPa (0.7 bar)
for satisfactory operation.
Minimum maintained inlet pressure for 10.8 kW, 100 kPa (1.0 bar) for
satisfactory operation.
Maximum static inlet pressure 1000 kPa (10 bar).
Minimum static pressure 20 kPa (0.2 bar) to keep the inlet valve closed.
2. Electrical
The Mira Orbis 9.0 kW requires a 40 Amp circuit protection device.
The Mira Orbis 9.8 kW requires a 45 Amp circuit protection device.
The Mira Orbis 10.8 kW requires a 45 Amp circuit protection device.
The terminal block will accept cable up to 16 mm².
3. Standards and Approvals
The Mira Orbis complies with all relevant directives for CE marking.
Installation Requirements
1. Plumbing
The appliance is designed to operate with a minimum maintained inlet pressure
of 0.7 bar (for 9.0 kW and 9.8 kW) and 1.0 bar (for 10.8 kW) up to a maximum
static inlet pressure of 10 bar.
When installed in very hard water areas (above 200 ppm temporary hardness)
your installer may advise the installation of a water treatment device, to reduce
the effects of limescale formation. Your local water company will be able to
advise the hardness of water in your area.
It is recommended that a non-restrictive (free owing) isolating valve is tted in
the cold water supply pipe to allow the complete maintenance of the appliance.
Do not use a valve with a loose washer plate (jumper) as this can lead to a
build up of static pressures.
The appliance is suitable for installation within the shower area. It is tted with
a pressure relief device and must be positioned over a water catchment area
with the controls at a convenient height for all users.
The appliance must be tted on to a nished at and even wall surface (this
wall surface should be tiled or waterproofed). DO NOT t the appliance to
the wall and tile up to the case. For safety requirements, an air gap must be
left behind the appliance.
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Avoid layouts where the shower hose will be sharply kinked. This may reduce
the life of the hose.
A Soap Dish/Hose Retaining Ring is supplied to prevent the handset from
dropping below the spill-over level of the bath or shower tray, which could
lead to contamination from back-siphoning. The supplied Hose Retaining Ring
should meet the majority of user requirements for shower installations with
exible outlet ttings. However, there will be occasions when it will not provide
a suitable solution. In these instances an outlet double checkvalve, e.g. a
Mira DCV-H, must be tted. This will increase the required supply pressure
typically by 0.1 bar (see section “Accessories”).
Supply pipework MUST be ushed to clear debris before connecting to the
appliance.
To avoid damage to the case when soldered ttings are used, pre-solder the
pipework and ttings before connecting them to the inlet connector assembly.
Refrain from applying excessive force when making any connections. Always
provide mechanical support when making the plumbing connections.
The appliance is tted with a brass inlet compression assembly for connecting
to a 15 mm supply pipe from the top, bottom or back. The tting of double
checkvalves in the inlet supply to the appliance, can cause a pressure
build-up, which could exceed the maximum static inlet pressure and damage
the appliance.
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Isolating Valve
Avoid Sharp Kinks
Convenient height
for all the family
25 mm Min.
Bath
Shower Tray
Fixed to nished
wall surface
Minimum
200 mm from
ceiling
Hose Retaining Ring

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2. Electrical
In a domestic installation, the rating of the electricity supplier’s fuse and the
consumer unit must be adequate for the additional demand. All Mira electric
showers are high power units, it is essential to contact your electricity supplier
to ensure that the supply is adequate for the product. Voltage drop due to
local heavy demand will reduce the shower’s performance.
The appliance must be earthed by connecting the supply-cable earth
conductor to the earth terminal. Supplementary bonding: Within the bathroom
or shower room, all accessible conductive parts of electrical equipment and
extraneous conductive parts (metal parts) that are likely to introduce earth
potential, must be electrically bonded to earth using a minimum cable size of
4.0 mm2 if the cable is not mechanically protected, (2.5 mm2if mechanically
protected).
The minimum cable size (cross-sectional area) required should be in
accordance with BS 7671.
As a guide only, and in accordance with BS 7671 we recommend close circuit
protection: i.e. 9.8 kW = 45 Amp
It is strongly recommended that a 30mA Residual Current Device (RCD) is
included in the electrical circuit. This may be part of the consumer unit or a
separate unit.
A separate, permanently connected supply must be taken from the consumer
unit to the appliance through a double-pole switch, which has at least 3 mm
contact separation. The switch can be a ceiling mounted pullcord type within
the shower room or a wall mounted switch in an adjacent room.
DO NOT twist the individual cable cores of either the live or neutral conductors,
as this will prevent them from entering the terminal block.
DO NOT exert strain on the terminal block. Make sure that the electrical
connections are tightly screwed down.
DO NOT turn-on the electrical supply until the plumbing has been
completed.
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Double-pole
Isolating Switch
Consumer Unit
Installation
Installation of Mira Orbis
Warning! Turn off the electrical and water supplies before proceeding with the
installation of the Mira Orbis. The electricity must be turned off at the mains and
the appropriate circuit fuse removed, if applicable.
Note! An installation template is supplied to help you install the Mira Orbis.
Remove the three cover retaining
screws.
Carefully remove the cover, making
sure that you do not strain the multi-
connector.
Carefully remove the multi-connector
from the socket on the control PCB in
the case
Remove the service tunnel.
Cover
Cover Retaining
Screw
Service Tunnel

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Two case inserts are supplied with the Mira Orbis, so that they can be trimmed
to suit the supplies entering the product. Before tting the cover, make sure that
the case inserts are tted.
Thoroughly ush the mains-fed cold water supply pipe. The supply must
be clean and free from debris BEFORE connecting the Mira Orbis.
To ush the pipework, turn on the water supply and drain a minimum of 10 litres
(2 gallons) of water into a bucket or catchment area. Turn off the water supply.
An installation template is supplied to help you install the Mira Orbis.
Put the installation template on the wall and mark through the positions of the
xing holes. Make sure that the position of these holes do not come in line with
any buried cables or pipework. Make sure that sufcient electrical supply cable
is available for connection to the terminal block.
Drill and plug the top two xing holes. Secure the Mira Orbis to the wall with the
screws provided. Drill the bottom xing hole with the product in place. Alternative
xings (not supplied) may be necessary for some wall structures. Avoid drilling
into any supply cable/pipe.
Determine the direction of the inlet
water supply: top (falling), bottom
(rising), or back inlet.
Note! Make sure that the back inlet
does not go directly back into the wall.
Use a soldered elbow.
Swivel the inlet connector assembly
to suit. Remove the inlet blanking cap.
Avoid trapping the green earth bonding
wire.
Install the mains-fed cold water supply
pipe. Do not overtighten.

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Feed cable into Case. Fit Earth sleeve
(not supplied) and strip insulation.
Do not twist cable cores.
Firmly connect the conductors. Do not
exert strain on the terminal block.
L = BROWN
E = GREEN/YELLOW
N = BLUE
Before retting the cover, pull the plastic
tab off the battery to activate it.
Ret the Service Tunnel.
Connect the multi-connector to the
socket on the PCB.
Ret the Cover. Make sure that it ts
correctly. Do not overtighten screws.
Do not use alternative screws to secure
the Cover. This can cause internal
damage to the appliance. Do not seal
around the back of appliance.
Install the shower ttings in accordance
with the manufacturer’s instructions.
Cover
Cover Retaining Screw
Service Tunnel
Important! Make sure
that the inlet earth wire is
routed as shown. Failure
to do so may cause
product malfunction.

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Cold Water Supply
Pipe (Bottom Entry)
Service Tunnel
Fixing Screw
Holes For Cover
Retaining Screws
Case Insert
Electrical
Supply Cable
Terminal
Block
Inlet Connector
Assembly
Heater Tank

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Commissioning
If you are unsure how an electric shower works, please read through the User
Instructions section before continuing.
Note! The temperature display throughout this guide will depend upon inlet supply
conditions and product settings.
Turn control to full cold. Turn the water supply
fully on.
Check for water leaks. Switch on the electrical
supply and press the
‘Start/Stop’ button
The temperature indicator
becomes illuminated,
showing time. Temperature
will be displayed after a few
seconds.
Press the ‘Low’ button,
light on the button comes
on
Water will be at full force
and at a cool temperature
as indicated by the
temperature indicator.
Turn the control slowly.
Temperature remains cool
and ow is reduced
Electrical supply is turned
off at the mains.
0 - 5 Secs
1.
4.
3.2.
6.5.
9.8.7.
5 - 10 Secs

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Turn control to full cold. The temperature will rise
slightly as indicated by the
temperature indicator.
0 - 10 Secs
12.11.10.
The ow rate will increase.
Adjust temperature as
required. Flow rate will adjust
automatically.
5 - 10 Secs
13.
15.
14.
16.
Press STOP button, light on the
temperature indicator dims to standby
state. When the shower has stopped
running the temperature display will
only show the clock. The water flow
will continue for a few seconds before
stopping. Isolate power. Display will go
blank.
Press the ‘Medium’ button,
light on the button comes
on
Press the ‘High’ button,
light on the button comes
on

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T h e w a r m e r t h e
shower, the lower
the ow rate and vice
versa.
Heated water is produced by adjusting the ow of cold water passed through a
heater tank.
The shower has three
heater settings.
User Instructions
How Your Electric Shower Works
The shower will purge water from
its tank for a few seconds.
Residual water may drain over a
few minutes.
17. 18.
Note! A slight hissing sound may be heard from the Mira Orbis during operation.
High mains water pressure and high shower temperatures will affect the tone. This
is quite normal in use.
0 - 5 Secs
The temperature
indicator shows the
temperature of the
shower.

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Water inlet pressure uctuations due to other draw offs (e.g. ushing toilet). Shower
temperature will be controlled to within ± 2°C of the set temperature provided that
the supply conditions remain within the required operating parameters (refer to
section: ‘Specications’).
For a cold shower select ‘Low’.
For a summer warm shower select ‘Medium’.
For a winter warm shower select ‘High’.
During extremes of mains water supply temperature, adjust heater setting to obtain
a better showering temperature.
The Effect of Seasonal Changes
The Effect of Other Water Devices
Example of how shower temperature
stabilises due to pressure changes.

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Using your Shower
Read the section “Important Safety Information” rst.
Temperature
Limit Indicator
Low Flow
Indicator
Temperature
of Shower
Clock
(hours/minutes)
Clock (seconds) Temperature Display
(Backlit during operation)
Start/Stop
Button
Heater Settings
Low, Medium, High
Temperature
Setting

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Note! At the end of every shower make sure that the shower head points into the
catchment area. A small amount of water may be retained in the shower handset
after the shower has been turned off. This may drain over a few minutes.
2.
1.
Set to desired position.
3.
Residual water may drain over a
few minutes.
7.
4.
Check water temperature before
entering shower.
5.
Allow 10 - 15 seconds for any temperature adjustments to reach the handset.
6.
Press STOP button, light on the button
goes out. Shower ow will continue for a
few seconds before stopping. Switch off
the electrical supply.
Switch on the electrical
supply and press the ‘Start/
Stop’ button
The temperature indicator
becomes illuminated.
Temperature
of Shower
Clock

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Clock Setting
1. Make sure that the product is
in ‘Standby’ state (i.e. Isolator
switch on).
2.Press and hold the ‘Medium
Power ’ button - the clock
backlight will come on full
brightness.
3. After a delay of a few seconds
the hour segments of the clock
start ashing
4. Press ‘Medium Power’ button
repeatedly until desired ‘hours’
are displayed on the clock.
5. After a short delay of a few
seconds the minute segments
of the clock start ashing.
6. Press ‘Medium Power’ button
repeatedly until desired
‘minutes’ are displayed on the
clock.
7. After a short delay of a few
seconds the minutes segments
stop flashing and the clock
backlight dims to its standby
state.
Medium Power
Pushbutton
Clock