Mira Sprint 7.5 Owner's manual

1
Maintenance Guide
Operation &B
Installation
ELECTRIC SHOWERS
THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER
7.5, 8.5 and 9.5 kW
Power
Low Flow
Temperature
Stop Start

2
Contents
Section Page
1 ..... Introduction ................................................................... 3
2 ..... Important Safety Information........................................... 4
3 ..... Pack Contents Checklist .................................................. 7
4 ..... Dimensions ................................................................... 8
..... Wiring Diagram ................................................................. 9
6 ..... Specifications ................................................................. 10
7 ..... Installation Requirements .............................................. 10
8 ..... Installation ................................................................. 14
9 ..... Commissioning ............................................................... 17
10 ... Operation......................................................................... 19
11 ... Maintenance .................................................................... 23
12 ... Fault Diagnosis ............................................................... 28
13 ... Spare Parts...................................................................... 30
Guarantee, Customer Care Policy, and How to contact us
.............................................................................. Back cover

3
Section
1Introduction
Ifyouexperienceanydifficultywiththeinstallationoroperationofyournewshowercontrol,
thenpleaserefertothe Maintenance and Fault Diagnosis section,beforecontactingCaradon
PlumbingSolutions.Ourtelephoneandfaxnumberscanbefoundonthebackcoverofthisguide.
Thank you for purchasing a quality Mira product. To enjoy the full potential of your new
product,pleasetaketimetoreadthisguidethoroughly,havingdoneso,keepithandyfor
futurereference.
Arangeofelectricshowershavingseparatecontrolsforpowerselectionandtemperature/
flowadjustment.Auniqueflowregulatorstabilisestemperaturechangescausedbywater
pressure fluctuations. These can result from taps being turned on or off or toilets being
flushed.
Mira Sprints covered by this guide:
Mira Sprint 7.5 - A 7.5 kW 240 V AC heater with a Mira RF1 adjustable spray handset
with three different spray actions (start, force and soothe). Individual lights indicate
'POWER' and 'LOW FLOW'. Supplied complete with flexible hose, adjustable clamp
bracket assembly, slide bar and supports, soap dish and hose retaining ring. Available
in white/chrome, white finishes.
Mira Sprint .5 - A 9.5 kW 240 V AC heater with a Mira RF1 adjustable spray handset
with three different spray actions (start, force and soothe). Individual lights indicate
'POWER' and 'LOW FLOW'. Supplied complete with flexible hose, adjustable clamp
bracket assembly, soap dish, slide bar and supports and hose retaining ring. Available
in white/chrome, white and light golden finishes.
Mira Sprint 9.5 -A9.5kW240VAC heaterwithaMiraRF1adjustable5sprayhandset
with three different spray actions (start, force and soothe). Individual lights indicate
'POWER' and 'LOW FLOW'. Supplied complete with flexible hose, adjustable clamp
bracket assembly, soap dish, slide bar and supports and hose retaining ring. Available
in white/chrome, white and light golden finishes.

4
Section
2Important Safety Information
1. Warning!
1.1. Productsmanufacturedbyusaresafeandwithoutriskprovidedtheyareinstalled,
usedandmaintainedingoodworkingorderinaccordancewithourinstructionsand
recommendations.
1.2. THIS MIRA SPRINT MUST BE EARTHED.
1.3. In accordance with ‘The Plugs and Sockets etc. (Safety) Regulations 1994, this
MiraSprintisintendedtobepermanentlyconnectedtothefixedelectricalwiring
of the mains system.
1.4. DO NOT twisttheindividualcablecoresoftheliveandneutralconductors,asthis
will prevent them from entering the terminal block.
1.5. Makesurethatanypipeworkthatcouldbecomefrozenisproperlyinsulated(Bye-
law49).
1.6. DO NOT operatethisMiraSprintifitisfrozen.AllowtheMiraSprinttothawbefore
usingagain.Theshowerunitmustnotbefittedwhereitmaybeexposedtofreezing
conditions.
1.7. Ifwaterleaksfromthepressurereliefvalve,maintenancewillberequiredbefore
the Mira Sprint can be safely used.
1. . DO NOT fitanyform ofoutlet flowcontrolastheoutletactsasaventforthetank
body. Only Mira recommended outlet fittings should be used.
1.9. TherearenouserserviceablecomponentsbeneaththecoveroftheMiraSprint.
Onlyacompetenttradespersonshouldremovethe cover.
1.10. 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.
1.10.1. If the cover is not correctly fitted and water has entered the Mira Sprint
case.
1.10.2. If the case is damaged.
1.10.3. If the Mira Sprint begins to make an odd noise, smell or smoke.
1.10.4. If the Mira Sprint shows signs of a distinct change in performance,
indicatinganeedformaintenance.
1.10.5. If the Mira Sprint is frozen.

2.4.1. National Inspection Council for Electrical Installation and Contracting
(NICEIC), throughout the UK, Tel: [phone].
2.4.2. The Electrical Contractors Association (ECA), England and Wales,
Tel: [phone].
2.4.3. The Electrical Contractors Association of Scotland (ECAS),
Tel: [phone].
2.6.1. Institute of Plumbing (IOP), throughout the UK, Tel: [phone].
2.6.2. National Association of Plumbing, Heating and Mechanical Services
Contractors (NAPH & MSC), England and Wales, Tel: [phone].
2.6.3. ScottishandNorthernIrelandPlumbingEmployers’Federation(SNIPEF),
Scotland and Northern Ireland, Tel: [phone].
1.11. Isolate the electrical and water supply before removing the cover.
1.12. Mains connections are exposed when the cover is removed.
1.13. Refertothe wiring diagram before making any electrical connections.
1.14. Ensure all electrical connections are tight, to prevent overheating.
2. Caution!
2.1. Read all of these instructions and retain this guide for later use.
2.2. Pass on this guide in the event of change of ownership of the installation site.
2.3. Follow all warnings, cautions and instructions contained in this guide, and on or
inside the Mira Sprint.
2.4. TheelectricalinstallationmustcomplywithBS7671“RequirementsforElectrical
Installations” commonly referred to as the IEE Wiring Regulations, or any
particular regulations and practices, specified by the local electricity supply
company.Theinstallationshouldbecarriedoutbyanelectricianorcontractorwho
is registered, or is a member of, an association such as:
2.5. Thisisahighpowerunit;itisessentialtocontactyourelectricitysupplycompany
to ensure that the electricity supply is adequate for the purpose.
2.6. The plumbing installation must comply with UK Water Regulations/Byelaws
(Scotland), BS 6700, Building Regulations or any particular regulations and
practices, specified by the local water company or water undertakers. The
installationshouldbecarriedoutbyaplumberorcontractorwhoisregistered,or
is a member of, an association such as:

6
2.7. Anyone who may have difficulty understanding or operating the controls of any
showershouldbeattendedwhilstshowering.Particularconsiderationshouldbe
giventotheyoung,theelderly,theinfirm,oranyoneinexperiencedinthecorrect
operationofthecontrols.
2. . When this Mira Sprint has reached the end of its serviceable life, it should be
disposedofinasafemanner,inaccordancewithcurrentlocalauthorityrecycling,
or waste disposal policy.

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Power
Low Flow
Temperature
StopStart
Tick the appropriate boxes to familiarize yourself with the part names and to confirm that the
parts are included.
2. Documentation
1 x Installation, Operation and Maintenance Guide 
1 x Installation Template 
1 x Customer Support Brochure 

Section
3Pack Contents Checklist
1. Mira Sprint 7.5, 8.5 and 9.5
1xMira Sprint 7.5,8.5and9.5 
3 x Wall Plug 
1 x Compression Nut 
1 x Olive 
3 x Fixing Screws 

8
Power
Low Flow
Temperature
Stop Start
Section
4Dimensions
203.5 mm
342 mm
79 mm

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Thermal Cutout
Dual Disc
Tank Connection
Load
P
E
N
Solenoid
Valve
Pressure/Power
Selector Switch
Low Flow
Neon
Inlet Connector
Wirin Dia ram
Section
5
Power On
Neon
92 Green
91 Green
90 Blue
89 Brown 96 Red
97 Brown
99 Brown
93 Black
95 Black
94 Blue
86 Brown 88 Red
On/Off

10
Section
7Installation Requirements
Section
6Specifications
1. Plumbing
1.1. Minimummaintainedinletpressure0.7barfor satisfactory operation.
1.2. Maximum static inlet pressure 10 bar.
1.3. Minimum static pressure 0.2 bar to keep the flow valve closed.
2. Electrical
2.1. The Mira Sprint requires a 40 Amp fuse.
2.2. The terminal block will not accept cable larger than 10 mm2 .
3. Standards and pprovals
3.1. This Mira Sprint complies with all relevant directives for EC marking.
1. Plumbing
1.1. TheMiraSprintisdesignedtooperatewithaminimummaintained inlet pressure
of 0.7 bar up to a maximum static inlet pressure of 10 bar.
1.2. The Mira Sprint is normally connected to the cold water mains-fed supply.
However,thewatersupplycanbetakenfromacoldwaterstoragecistern,provided
thereisaminimummaintainedinletheadofwaterof7metres(theverticaldistance
fromthebaseof thecold waterstoragecisterntotheshowerfitting handset).To
reduce pressure losses and fluctuations, the cistern-fed water supply must be
independent from other supply draw-offs, and should avoid long horizontal pipe
runs and use swept bends rather than 90 ° elbows.
1.3. The Mira Sprint is suitable for installation within the shower area. It is fitted with
apressurereliefdeviceandmustbepositionedoverawatercatchmentareawith
the controls at a convenient height for the user.

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1.4. The Mira Sprint is fitted with a plastic inlet connector intended to connect to a
15 mm compression fitting supplied from the top, bottom or back.
1.5. Do not fittheMira Sprinttothe wallandtile uptothecase. TheMiraSprint must
befittedon to afinishedflatandevenwallsurface.Thisis importantas difficulty
maybeencounteredwhenfittingthecoverandsubsequentoperationoftheunit
could be impaired (Small pillars moulded on to the back of the case allow air
circulation).
1.6. Refrain from applying excessive force when making any connections. Always
providemechanicalsupportwhenmakingtheplumbingconnections.
1.7. Do not install the Mira Sprint in a position where it may become frozen. The
showerunitmustnotbefittedwhereitmaybeexposedtofreezingconditions.Do
not operate the unit if suspected of being frozen.
1. . Werecommendthatanon-restrictive(freeflowing)isolatingvalveisfittedinthecold
watersupplypipetoallowthecompletemaintenanceoftheMiraSprint.Do not use
a valve with a loose washer plate (jumper) as this can lead to a build up of static
pressures.
1.9. To avoid damage to the case when soldered fittings are used, pre-solder the
pipework and fittings before connecting them to the inlet connector assembly.
1.10. TheMiraSprintisfittedwitha ½"BSPmaleoutletthread,toacceptaMirashower
hose.
1.11. Supply pipework MUST be flushed to clear debris before connecting the Mira
Sprint.
1.12. Wheninstalledinveryhardwaterareas(above200ppmtemporaryhardness)your
installer may advise the installation of a water treatment device, to reduce the
effectsoflimescaleformation.MiraSprintmalfunctionduetoexcessivelimescale
formation is not covered by the manufacturer’s guarantee. Your local water
company will be able to advise the hardness of water in your area.
1.13. To comply with Regulations/Bye-laws which refer to shower hose connections,
ahoseretainingringissuppliedtopreventthehandsetfrom droppingbelowthe
spilloverlevelofthebathorshower,whichcouldleadtocontaminationfromback-
siphonage (refer to Figure 1). The supplied hose retaining ring should meet the
great majority of user requirements for shower installations with flexible outlet
fittings. However, there will be occasions when the hose retaining ring will not
provideasuitablesolution.Intheseinstancesanoutlet doublecheckvalve,e.g.
theMiraDCV-H,must befitted.TheinclusionoftheMiraDCV-Hwillincreasethe
required supply pressure typically by 0.1 bar.

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Doublecheckvalves,fitted in the inlet supply totheappliance,causea pressure
build-up,whichcouldexceedthemaximumstaticinletpressurefortheappliance.
1.14. Avoidlayoutswheretheshowerhosewillbesharplykinked.Thismayreducethelife
of the hose.
Hose Retaining
Ring
25mmMinimum
Spill-over
Level
2. Electrical
2.1. Inadomesticinstallation,theratingoftheelectricitysupplycompanyfuseandthe
consumerunitmustbeadequatefortheadditionaldemand.AstheseMiraSprints
arehigh power units, it is essential to contactyourelectricity supply company to
ensure that the supply is adequate for the Mira Sprint. Voltage drop due to local
heavydemandwillreducetheshower'sperformance.
2.2. TheMiraSprint must be earthed byconnectingthesupply-cableearthconductor
to the earth terminal.
Supplementary bonding: Within the bathroom or shower room, all accessible
conductivepartsofelectricalequipmentandextraneousconductivepartsthatare
likely to introduce earth potential, must be electrically bonded to earth using a
minimumcablesizeof4.0mm2 ifthecableisnotmechanicallyprotected(2.5mm2
ifmechanicallyprotected).
2.3. Details for the method for determining the cable size are to be found in the
BS7671(Formallyknownasthe16thEditionoftheIEEWiringRegulations).The
minimum cable size (cross-sectional area) required is 6 mm2under normal
conditions of installation .
Figure 1

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Important! Theshowercircuitshouldbeseparatedfromothercircuitsbyatleast
twicethediameterofthecableorconduitanditshouldnotberunthroughthermally
insulating material or in locations where the ambient temperature is likely to
exceed30°C.Ifanyoftheseconditionsareunavoidableitisnecessarytoperform
the full calculations detailed in BS7671 to determine the cable size. This will
preventdamagetothecablecausedbyoverheating.
2.4. To obtain full advantage of the power provided by this unit, use the shortest
possible cable route from the consumer unit to the shower. It is also necessary
tosatisfythedisconnectiontimeandthermalconstraintswhichmeanthat,forany
given combination of current demand, voltage drop and cable size, there is a
maximum permissible length of circuit.
As a guide only, thefollowingmaximumpermissiblelengthsaregivenfor6mm2
cable protected by a 40A MCB type B and allowing for a 5 Volt drop:
Sprint 7.5 kW (240 V AC) at 240 V - 22Metres
Sprint 8.5 kW (240 V AC) at 240 V - 19Metres
Sprint 9.5 kW (240 V AC) at 240 V - 18Metres
2.5. A 30 mA residual current device (RCD) should be fitted. This may be part of the
consumer unit or a separate unit.
2.6. Aseparate,permanentlyconnectedsupplymustbetakenfromtheconsumerunit
to the Mira Sprint through a double-pole switch, which has at least
3mmcontactseparation.Theswitchcanbeaceilingmountedpull-cordtypewithin
the shower room or a wall mounted switch in an adjacent room.
2.7. DO NOT twisttheindividualcablecoresoftheliveandneutralconductors,asthis
will prevent them from entering the terminal block.
2. . DO NOT exert strain on the terminal block.
2.9. DO NOT turn-on the electrical supply until the plumbing has been completed.
Power
Low Flow
Temperature
Stop Start
Plumbing and Electrical Schematic Diagram

14
Section
8Installation
1. Mira Sprint
WARNING! Isolatetheelectricalandwatersuppliesbeforeproceedingwiththeinstallation
of the Mira Sprint.
Note! An installation template is supplied to help you install the Mira Sprint.
1.1. DecideonasuitablepositionfortheMiraSprint(minimumdistanceof200mm
fromtheceilingtoallowforcoverfitandremoval).ThepositionoftheMiraSprint
andtheshowerfittingsmustprovideaminimumgapof25mmbetweenthespill-
over level of the shower tray/bath and the handset. This is to prevent
backsiphonage(referto Figure 1, Section 7).
1.2. Removethe three coverretainingscrews.
1.3. Removethecover.
1.4. Remove the service tunnel.
1.5. 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.
Useasolderedelbow
1.6. Swivel the inlet connector assembly to suit. Remove the inlet blanking cap.
Avoidtrappingthegreenearthbondingwire.
1.7. Removeasappropriate,thethinnedsectionsoftheMiraSprintcase,toallowthe
supplies to enter the product.
1. . Thoroughly flush the mains-fed cold water supply pipe. The supply must
be clean and free from debris BEFORE connecting the Mira Sprint.
1.9. An installation template is supplied to help you install the Mira Sprint.
Puttheinstallation template onthewallandmark through the positionsofthe
fixing holes. Make sure that sufficient electrical supply cable is available for
connection to the terminal block.

1
1.10. Drillandplugthetoptwofixingholes.SecuretheMiraSprinttothewallwiththe
screws provided. Drill the bottom fixing hole with the product in place.
Alternative fixings(notsupplied) may be necessary for some wallstructures.
Avoid drilling into any supply cable/pipe.
1.11. Install the mains-fed cold water supply pipe.
Installation of the Mira Sprint
Service Tunnel
Inlet Connector
Assembly
Cold Water
Supply Pipe
Terminal Block
Cover Retaining
Screw
Holes For Cover
Retaining Screws
(The inlet connector
assembly can be
swivelled to suit the
supply)
Do not fit the Mira Sprint to
the wall and tile up to the
case. The Mira Sprint must
be fitted on to a finished flat
and even wall surface (small
pillars moulded on to the
back of the case allow air
circulation).
(The service tunnel
or case may be
trimmedtosuitrising
or falling supply)
Fixing Screw
Splash Guard
(Make sure that it is secured
before operating the shower).
Electrical Supply
Cable

16
1.12. Make the connection to the mains-fed cold water supply pipe.
1.13. Bring the electrical supply cable into the case through one of the cable entry
points.
1.14. Strip back sufficient of the outer cable insulation to enable routing to terminal
block.
1.15. Fit an earth sleeve to the earth conductor. Connect the conductors firmly into
the terminal block. Make sure that the bare cores of each conductor are
securely trapped within each conductor clamp.
L = Red wire
N = Black wire
E = Yellow/Green sleeved wire.
1.16. Re-tighten the terminal block screws.
1.17. Ifnecessary, fitanearthbondingclamptothecopper supplypipeand ensure
bonding in compliance with BS7671 (IEE Regs).
1.1 . Refit the cover. Fit and tighten the three cover retaining screws.
1.19. Fit the shower fittings. Refer to seperate instructions.

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1. Mira Sprint
Ifyouareunsurehowelectricshowerswork,pleasereadthrough,Section 10, Operation
beforecontinuing.
Section
9Commissionin
1.1. Make sure that the START/STOP button is in the
outermost positionandthattheelectricalsupplyhas
been isolated.
1.2. Turnthe BOTTOM controlknobfullyanticlockwiseto
the full cold position.
1.3. Turn the water supply fully on at the isolating valve,
check that water is not leaking from the bottom of the
case.
1.4. Turn the TOP control knob to the low position.
1.5. Switch on the electrical supply at the double pole
switch. The 'POWER' neon will provide a visual
indication that the electrical supply is connected.
1.6. Press the START button. Check that water flows
freely from the shower within a few seconds. If not
refertoSection 11, Maintenance.Thewaterfromthe
handsetwillbeatfullforceandatacooltemperature.
1.7. Turn the BOTTOM knob slowly clockwise. As the
knob is rotated the flow will be reduced and the
temperaturewillremaincool-thisshowsthattheflow
regulator assembly is operating correctly. Return the
knob anticlockwise to full cold position.
Temperature
Stop Start
Power
Low Flow
Stop Start
Temperature

18
Note! AslighthissingsoundmaybeheardfromtheMiraSprint duringoperation.
Highmainswaterpressureandhighshowertemperatureswill effectthetone.
This is quite normal in use.
1.11. Whentherequired temperature is reached, push the
STOP button to stop the flow. Water will continue to
flow fromtherhandsetforafewseconds,aswateris
purgedfromthetank.Isolatethepoweratthedouble
pole switch.
1. . Turn the TOP knob to the medium position. The
temperature of the water should rise slightly. Allow a
fewsecondsforthewarmwatertoreachthehandset
- this shows that the MEDIUM power setting is
operatingcorrectly.
1.9. TurntheTOP knobtothehighposition.Thetemperature
of the water will rise further - this shows that the full
powersettingisoperatingcorrectly.
1.10. SettheshowertemperaturebyrotatingtheBOTTOM
knob as necessary. Turn the knob clockwise for
hotter water and anticlockwise for cooler water.
Note! When the temperature is changed the flow
rate will change.
Power
Low Flow
Stop Start
Temperature
Power
Low Flow

19
1. dvice to Users
Read the section “Important Safety Information” first.
1.1. Electric showers work by taking in cold water and passing it over the heating
elements contained in the tank body of the shower.
1.2. Theshoweringtemperatureisadjustedbyturningthetemperaturecontrolknob,
whichvariestheflowofcoldwateracrosstheelements.Theslowertherateofflow,
the warmer the water and vice versa. The holes in the spray plate of the shower
handset should always be kept clean to maintain a consistent flow and stable
showertemperatures.
1.3. The Mira Sprint is designed to stabilise temperature changes caused by water
pressurefluctuations.Thesecanresultfromtapsbeingturnedonoroffortoilets
beingflushed.Undersuchconditionsaverageshowertemperatureswillbeheld
withina6 °C band, provided that the minimum required pressureismaintained.
1.4. Seasonal changes in the temperature of the incoming cold water supply and/or
fluctuationsinmainselectricalvoltage,willrequirethe'TEMPERATURE' knobto
be adjusted as necessary.
1.5. The Mira Sprint requires a minimum maintained/running pressure of 0.7 bar to
operate.Atpressuresabove0.7bartheMiraSprint willminimisethetemperature
fluctuations caused when other draw-off points are used. If the flow rate drops
below an acceptable value, the Mira Sprint will turn the heater elements off,
resultinginacoldshower.The'LOW FLOW'neonwillprovidevisualconfirmation
of this condition.
1.6. If the water temperature reaches an unsafe level, the thermal switch assembly
turnsofftheheaterelements.Asthewatertemperaturefallstheelementswillbe
turnedon.Theswitchwillcycleon/off/oniftheflowrateisnotincreasedandthe
temperatureoftheshowerreduced.
1.7. Checktheshowertemperaturebeforeenteringtheshower.Theprevioususermay
haveselectedadifferent temperaturesetting.
1. . Whentheshowerisfirstturnedon,oradifferenttemperatureisselected,therewill
beaslight delay before thewatertemperaturechanges.
Section
10 Operation

20
7.5 kW
8.5 kW
(i) These curves are for the specified outputs at 240V.
(ii) AllMiraSprintheatingelementshaveamanufacturingtolerance.Thusflow
rates can be above or below those indicated.
(iii) The left-hand scale is temperature rise. (Temperature rise = Showering
temperatureminustheincomingcoldwatertemperature.)
Example: FortheMiraSprint7.5kWonfullpowersettingwithanincomingwatersupply
at10°Candashoweringtemperatureat45°C,thetemperatureriseis35°C.Theflowrate
is therefore, 3 l/min.
Temperature Rise Versus Flow Rate For The Mira Sprint 7. kW,
8. kW and 9. kW
Flow Rate (litres per minute)
Temperature Rise °C
12113267109854
10
15
20
25
30
35
40
45
50
55
9.5 kW