MIRA FORM SHOWER CONTROL Installation & User Guide
Contents
1. L X 1 sl U MAL E n Cold Hot Pumped Shower The shower can be installed with an inlet pump twin impeller The pump must be installed on the floor next to the hot water cylinder Ensure hot cylinder vent pipe is arranged as shown to enable air separation 12 INSTALLATION General Installation must be carried out in accordance with these instructions and must be conducted by designated qualified and competent personnel 1 2 Before commencing make sure that the installation conditions comply with the information given in section Specifications Care must be taken during installation to prevent any risk of injury or damage The mixing valve should be positioned for easy access during use and maintenance All routine maintenance procedures can be conducted with the mixing valve body in place except for strainer and checkvalve access For all models allow a minimum 80 mm clearance in front ofthe temperature control to enable removal of the serviceable parts during maintenance The use of supply line or zone strainers will reduce the need to remove debris at each mixing valve point The recommended maximum mesh aperture dimension for such strainers is 0 5 mm Pipework must be rigidly supported Pipework dead legs should be kept to a minimum Th2. 152 mm 600 mm I SPECIFICATIONS Normal Operating Conditions inlet dynamic pressures nominally balanced to within 10 of each other during flow adifferential of approximately 50 C between the hot and cold inlet temperatures and with differentials of 15 35 C between the blend setting and either supply daily usage of 1 6 hours installation and usage environment not subject to extremes of temperature unauthorised tampering or wilful abuse Other Applications For information on other specific applications or suitability refer to Kohler Mira Ltd for Local Agent Disinfection In applications where system chemical disinfection is practised chlorine can be used calculated chlorine concentration of 50 mg l ppm maximum in water per one hour dwell time at service interval frequency Such procedures must be conducted strictly in accordance with the information supplied with the disinfectant and with all relevant Guidelines Approved Codes of Practice If in any doubt as to the suitability of chemical solutions refer to Kohler Mira Ltd or Local Agent Pressures and Flow Rates For optimum performance dynamic supply pressures should be nominally equal Recommended Minimum Dynamic Supply Pressure 0 15 bar 0 2 bar healthcare Recommended Min
3. 7 MIRA FORM SHOWER CONTROL Installation amp User Guide These instructions are to be left with the user CONTENTS INTOdUCUION iii 3 Safety Warnings cccccseccesseeeeesseeeeeeseeeeneeeesesneeeeessaeeeenseessesaeeeeessenaeeess 3 Pack COMENTS erines a aaea idea 4 Dimensions osain EAEE AAA A Aaaa 6 Specification Siea nnee ii EAHA 7 Normal Operating Conditions ooooonnncnnincnnnnncocnnncnannnacccananacrnnnrrnnnnccs 7 Pressures and Flow Rates 0 eceeeeeeeeeeeeeeneeeeeeeeeeeaaaeeeeeeeeeaaaeeeeeeseeaaas 7 TOMPEraturesS coonccccccccnnncocononcnnnn nana nnrrnnnn nr 9 Installation Requirements c mmcccccnnnicnnnnnnnnnnnnanrenennnnn reee 10 Installation na 13 EE ee E E A rata 13 Reversed Inlet Supplies ooooooncccinncnnnnnccccnnncccncnnca nan nrrcnn nn 14 Installation Solid and Dry lined Walls oooo nncnnnnnnnccnnnnccacnnccccnnnncon 15 Shower Fittings Installation ooon nnnnicinnnnnccnnnnnnnn acc cccnncrcnn nn 18 Installation Panel walls ese occiso as 19 COMMISSIONIN Daiana 22 A aa ae Sa e Naaa 25 Fault Diagnosis ii 27 Mata Ce ii ibas 29 Spare PAINS cui 41 Customer Service cocooonncconnnncnnnnncneninanrncnnner rn rra nan Back Page INTRODUCTION The Mira Form Thermostatic mixing valve is specified to meet the highest standards of safety comfort and economy as demanded by todays users The Mira Form is designed manufactured and supported in accordance with accredited BS EN ISO 9001 1994 Qual
4. 0 5 10 15 20 Flow Rate litres minute The high capacity spray plate should be fitted to the handset when maintained inlet pressures are above 1 bar 8 25 30 Temperatures Optimum performance is obtained when temperature differentials of 20 C or more exist between blend and either supply Blend control accuracy will begin to diminish at temperature differentials below 12 C Blend Temperature Range Between ambient cold and approximately 60 C according to hot water supply temperature Thermostatic Control Range Approximately 25 60 C Optimum Thermostatic Control Range 30 50 C Recommended Minimum Cold Water Supply Temperature 1 C Recommended Maximum Hot Water Supply Temperature 85 C Note The shower control can accept temporary temperature excursions above 85 C without damage however operation at such elevated supply temperatures is not recommended For reasons of general safety hot water storage temperatures should ideally be maintained at between 60 65 C where serving ablutionary applications Minimum temperature differential between hot and outlet temperature 10 C Flow Control The Mira Form shower control has integral flow control no other user operated flow control should be used with this shower control Connections The shower control inlet connections are 15 mm compression nuts and olives are provided Hot H and Cold C inlets are clearly marked for the shower control and must be c
5. 31 Wall Clamp Pg Locknut Inner Bush Temperature Knob Locknut Be Trim eS Grub A Flow Knob Screw a Lever Lever Screw Cover Concealing Plate Foam Outlet Seal DON RAC Nut Grub a Fitting the Knob Assembly Screw the locknut onto the headnut until it firmly locks the concealing plate in place Make sure that the O seal is fitted to the locknut for a watertight seal between the locknut and concealing plate Note Do not overtighten the locknuts or the concealing plate will deform Refit the locknut trim Make sure that the trim is fitted the correct way round see illustration Fit the control knob inner bush so the securing grub screw aligns with the spindle flat Tighten the grub screw with the 2 5 mm hexagonal key provided Make sure that the inner bush O seal is fitted for a watertight seal between the inner bush and the locknut Rotate the inner bush fully clockwise for the flow control or fully anticlockwise for the temperature control Refit the control knobs see illustration and secure with the lever screw and the lever cover Note The lever screw needs to be secured with a spanner Do not overtighten the lever screw as product damage may occur Note If the control knobs are incorrectly fitted the levers may foul against each other when in use Check the control knobs can be rotated fully and the full flow and temperature ra
6. High capacity dark grey Spray Plate Assembly Low capacity dark grey Clamp Bracket Assembly Slidebar D Slidebar Wall Fixing Assembly A 413 58 Soapdish eds E Hose A Hose Seal x2 449 02 449 01 g 449 03 41 Shower Control Spare Parts List 147 67 407 26 427 32 427 33 427 48 427 50 441 54 441 55 441 56 441 57 441 58 441 59 441 75 441 90 441 91 441 92 441 93 441 94 441 95 441 96 441 97 441 98 1598 030 Outlet Checkvalve Assembly Cartridge Removal Clip Inlet Checkvalve Assembly Filter Seal Pack components identified A Compression Nut and Olive Pack Spindle Extension Headnut Flow Cartridge Assembly Valve Mounting Bracket Screw Pack not illustrated Wall Mounting Bracket Valve Body Concealing Plate Seal Pack components identified B Concealing Plate Locknut Assembly Temperature Lever Assembly Flow Lever Assembly RAC Shroud RAC Elbow Assembly components identified C RAC Wall Clamp 10 L Min Flow Regulator Thermostatic Cartridge 42 407 26 Z 441 54 441 98 gt 147 67 y 43 CUSTOMER SERVICE Guarantee of Quality Mira Showers guarantee your product against any defect in materials or workmanship for the period shown in the Guarantee Registration Document included with your shower Alternatively to confirm the applicable guarantee period please contact Customer Services To validate the guarantee please
7. Renew the appropriate cartridge b Supply pressures too high Fit pressure reducing valve Refer to section Specifications for acceptable operating pressures 9 Drip from spray plate assembly in the handset a A small amount of water may be retained in the shower fitting after the shower control has been turned off This may drain over a few minutes Change the angle of the handset to vary the draining time b Flow control cartridge faulty Check and renew if necessary 10 Shower temperature changes when spray action is adjusted a Spray plate assembly blocked To clear the blockage refer to section Maintenance Spray Plate Cleaning b Adjusting the spray action significantly changes the flow of water Install the high capacity spray plate assembly refer to section Maintenance Spray Plate Removal and Installation 28 MAINTENANCE General 1 The maintenance of this product must be carried out in accordance with instructions given in this Manual and must be conducted by designated qualified and competent personnel 2 Mira products are precision engineered and should give continued superior and safe performance provided They are installed commissioned operated and maintained in accordance with the recommendations stated in this Product Manual Periodic attention is given as necessary to maintain the product and its associated installation components in good functional
8. assembly and the flow divertor Make sure that the green bar on the adjuster ring is uppermost and align the inner teeth on the adjuster ring with the teeth on the handset flow divertor Clip the adjuster ring into position 39 Handset Body Assembly Spray Plate Assembly Adjuster Ring O Seal Flow Divertor Spray Plate Assembly O Seal Teeth Spray Plate Assembly Inner Teeth Adjuster Ring Sprayplate Cleaning Sprayplate External Assembly 1 Use your thumb or a soft cloth to wipe any limescale from the soft triangular nozzles and the front face of the spray plate assembly Sprayplate Internal Assembly 2 Remove the spray plate assembly Referto section Maintenance Spray plate assembly removal and installation Remove the O seals Clean all the components with a stiff brush If necessary use a plastic kettle descalent in accordance with the manufacturer s instructions Refit the components in reverse order Install the spray plate assembly Refer to section Maintenance Spray plate assembly removal and installation 40 O Seals Spray Plate SPARE PARTS Shower Fittings Spare Parts List 126 65 411 37 413 22 413 58 413 60 413 61 449 01 449 02 449 03 449 04 449 05 632 73 Slidebar Ends Service Pack O Seals components identified A Adjuster Ring satin chrome Handset Body Assembly chrome Spray Plate Assembly
9. depth using the building in shroud as areference The wall mounting bracket requires a minimum building in depth of 60 mm The total building in depth for the shower control to the finished wall surface can be between 66 mm and 81 mm This will accommodate a final thickness of plaster and tiles of between 6 mm and 21 mm Mark the position ofthe wall mounting bracket outer fixing holes Drill a 6 0 mm diameter hole at each of the marked positions and insert the wall plugs supplied Fit the supply pipes into the cut channels Flush the hot and cold water supply pipes thoroughly The supplies must be clean and free from debris before connecting the shower control Failure to do so may result in product malfunction 16 Outer Fixing Holes 10 Fit the valve and connect the supply Hot and pipework Check the hot and cold eis supplies have been connected to the correct inlets If necessary the valve inlets can be reversed refer to Reversed Inlet Supplies for further information Note If the wall screws cannot be fixed into the wall fit the building in shroud and fill the cavity behind the Q mounting bracket with an appropriate Outlet material e g expandible foam 11 Fitthe outlet support bracket over the RAC elbow and mark the position of the two fixing holes Remove the bracket and drill the two 6 0 mm diameter fixing holes Insert the wall plugs and fit the outlet support bracket with the fixing screws suppl
10. Temperature Assembly Grub Screw Spindle Head Nut Temperature Knob Locknut M4 Locking Lever Screw _Inner Bush Screw Inlet Port Seals S Removal Clip Lever Cap Thermostatic Cartridge Removal Maintenance Procedure Flow Cartridge Removal 1 2 Turn off the water supplies to the shower control Open the flow control to release the trapped water pressure and assist the draining of residual water Remove the lever knob and concealing plate assemblies Refer to section Maintenance Removing Fitting Knob and Concealing Plate Assemblies Remove the flow spindle the headnut and the splined adaptor Unscrew the flow cartridge anticlockwise and remove Warning Some residual water may be released 35 Cleaning Renewal of Parts 5 7 8 The inner surface of the shower control body must be clean before refitting the cartridge lf scale or deposition is present clean without thermostatic flow and checkvalve cartridges fitted using a mild proprietary inhibited scale solvent e g domestic kettle descalent After descaling rinse the body thoroughly in clean water before refitting the cartridge Note The shower control body must be cleaned carefully and not damaged in any way Do not use any abrasive material Clean the cartridge by flushing through under a jet of clean water to remove lodged particles Do not descale Cartridges are not serviceable and must not be dismantled Cartridges cannot be tested individua
11. order Guidelines are given below 3 The use of main supply line or zone strainers recommended maximum mesh aperture dimension is 0 5 mm will reduce the need to remove debris at each mixing valve point The designed minimum service life of all cartridges used in Mira products is 5 years providing the Mira Form is operated with the recommended operating conditions and within the recommended operating parameters However when supply conditions and or usage patterns do not conform to the recommended operating parameters and or the recommended operating conditions the cartridge and other critical parts may need to be replaced more frequently recommended operating conditions and recommended parameters are defined in section Specifications under the headings of Normal Operating Conditions and Operating Parameters 29 Maintenance Procedures Maintenance must be carried out in accordance with these instructions and must be conducted by designated qualified and competent personnel This mixing valve is designed for minimal maintenance under conditions of normal use External surfaces may be wiped clean with a soft cloth and if necessary a mild washing up type detergent or soap solution can be used Warning Many household and industrial cleaning products contain mild abrasives and chemical concentrates and should not be used on polished chromed or plastic surfaces Should an internal malfunction occur then
12. outlet is open b move the temperature control rapidly from cold to hot and hot back to cold several times pausing at each extreme Adjust the temperature of the mixed water in accordance with the instructions refer to Maximum Temperature Settings Operate the outlet flow control and check a Flow rate is sufficient for the purpose b Temperature s obtainable are acceptable 24 OPERATION Mira Form Shower Control The Mira Form shower control has separate controls for temperature and flow Turn the temperature lever anticlockwise for warmer water or clockwise for cooler water The preset maximum temperature can be adjusted as required to suit both site conditions and the user s comfort Refer to section Commissioning for further information on Maximum Temperature Setting Turn the flow lever anticlockwise until the desired force of water is obtained Note When the Form shower control is installed with a fully modulating multipoint or combination type gas water heater the maintained mains water pressure and hence the flow must be sufficient to keep the heater ignited Therefore it is important to ensure that the flow knob is fully open to prevent variation in the hot water supply temperature 25 Mira Form Fittings Handset Spray Adjustment The Mira Form adjustable handset has three different spray actions start soothe and f
13. selection of a temperature that is too hot All Mira Thermostatic mixing valves are fully performance tested and the maximum temperature is preset to approximately 43 C under ideal installation conditions at the factory Site conditions and personal preference may dictate that the maximum temperature has to be reset following installation This shower control is provided with an adjustable temperature control knob which allows the user to select the blend temperature between ambient cold up to a preset maximum Maximum Temperature Setting Check that an adequate supply of hot water is available at the hot inlet of the shower control During resetting the hot supply to the shower must be as close to the typical maximum to offset the possibility of any blend shift due to fluctuating supply temperatures However the minimum temperature of the hot water must be at least 12 C above the desired blend for correct thermostatic operation Temperatures should always be recorded using a thermometer with proven accuracy Check that both inlet isolating valves are fully open Turn the temperature knob to maximum and operate the flow control Allow the temperature to stabilize and check the outlet temperature If the outlet temperature is set correctly then refer to Commissioning Checks If adjustment of the temperature is required carry out the following procedure 22 Remove the temperature knob and locknut assemblies Refer to section M
14. this will probably require replacement of parts Components are precision made so care must be taken while servicing to avoid damage When ordering spare parts please state product type i e Mira Form and identify part name and number refer to section Spare Parts A Seal pack is available containing all the seals that may be necessary for renewal during maintenance or servicing Lubricant Important All seals are pre lubricated If you need to lubricate the seals use only a small amount of silicone only based lubricants on this product Do not use oil based or other lubricant types as these may cause rapid deterioration of seals 30 Removing Fitting Knob and Concealing Plate Assemblies Removingthe Knob Assembly 1 Removing the Concealing Plate Assembly 1 Rotate the flow knob fully clockwise and the temperature knob fully anticlockwise Unscrew the lever cover anticlockwise Unscrew the lever screw anticlockwise and remove the temperature flow knob Unscrew the grub screw using the 2 5 mm hexagonal key and remove the inner bush Lift off the locknut trim and unscrew the locknut in an anticlockwise direction Remove both flow and temperature knob assemblies Refer to Removing the Knob Assembly for instructions Unscrew the grub screw securing the RAC using the 2 5 mm hexagonal key provided Remove the RAC Unscrew and remove the wall clamp nut then remove the outer seal and concealing plate
15. 5 Turn off the supplies to the shower control Open the flow control to release the trapped water pressure and assist the draining of residual water Remove the temperature and flow knob assemblies using the 2 5 mm A F hexagonal wrench supplied Remove the concealing plate seals and support bracket Do not remove the temperature spindle With the removal clip still in place unscrew the head nut using a 35 mm A F wrench This will release the body shroud and also begin to draw the thermostatic cartridge out of the shower control body Caution Some residual water may be released Note which inlet aligns with the hot marked H and coloured red lug on cartridge Pull the thermostatic cartridge free of the shower control body Cleaning Renewal of Parts 6 10 The interior surface of the shower control body must be clean before refitting the cartridge If scale or deposition is present clean without thermostatic flow and checkvalve cartridges fitted using a mild proprietary inhibited scale solvent e g domestic kettle descalent After descaling rinse the body thoroughly in clean water before refitting cartridges Note The body interior must be cleaned carefully and not damaged in any way Do not use any abrasive material Cartridges may only be cleaned by flushing through under a jet of clean water to remove lodged particles Do not descale Cartridges are not serviceable and must not be dismantled Cartridges cannot be test
16. 5 mm oe e Compression NS Nut and Olive RAC Elbow Elbow Outlet 19 Mount the mixing valve securely onto the rear of the panel with the fixing screws supplied Note If access is available it may be preferable to make the initial valve pipework connections prior to securing the mixing valve to the panel Important Always flush through the hot and cold supplies thoroughly before connection to the mixing valve Connect the inlet pipework checking that the hot and cold supplies have been piped to the correct inlets Check that all connections are watertight To complete installation follow the instructions in section Installation solid and dry lined walls Refer to section Commissioning before operating the shower control Laminated Panel 4 mm 19 mm thick Concealing Plate Foam Outer Seal Concealing Plate Outlet Support Bracket Control Locknut Knob and Trim Assembly a Go A A Xe Right Angle Connector Use the six inner fixing holes to mount the valve if no further finishing surface is to be added to the panel 0 Outlet Seal Wall Clamp Nut 20 Front Mounted maximum thickness 13 mm To fit the Form shower control to the front face of a panel a further finishing layer e g plaster and tiles must be applied to the panel to cover over the wall mounting plate and fixing screws This finishing layer can be between 6 mm and 21 mm thick The laminated panel can be a ma
17. ace unscrew the head nut using a 35 mm A F wrench this will begin to draw the thermostatic cartridge out of the body Note Some residual water may be released Pull the thermostatic cartridge free of the valve body Rotate the thermostatic cartridge through 180 and carefully push the cartridge back into the valve body checking that the 2 cartridge inlet port seals remain in place and locate the cartridge lugs into the body slots Note The red and blue markings on the cartridge will now not correspond with the body markings to avoid future confusion remove the red and blue stickers from the valve body Carefully align and then tighten the head nut do not overtighten Complete the Installation if appropriate Ifthe mixing valve body has already been installed restore hot and cold supplies and check for any leaks Refit the knob and cover assemblies refer to section Maintenance Removing Fitting Knob and Concealing Plate Assemblies The maximum temperature may now need resetting check the outlet water temperature and if necessary refer to section Commissioning 14 Installation Solid and Dry lined Walls Shower Control Installation The Mira Form can be built into solid dry lined stud partition or dry partition wall structures All plumbing connections are 15 mm compression A building in shroud is supplied which can provide a depth reference when chiselling outthe wall surface and protects the shower control d
18. aintenance Removing Fitting Knob and Concealing Plate Assemblies Unlock and remove the temperature spindle Use the 3 mm hexagonal key supplied to undo the locking screw Rotate the cartridge spindle until the required maximum blend temperature is obtained at the discharge point clockwise decrease temperature When resistance is felt do not use force to turn any further as this can damage the internal parts Cartridge Temperature 3mm A F Spindle A Spindle Hexagonal bee Wrench dl aa Lever Cover Locknut Trim and Screw AN A K y o Z pi f A O Temperature 2 Knob aS Maximum Temperature Setting Refit the temperature spindle at the maximum temperature position and secure with the locking screw Refit the locknut and temperature knob assemblies Rotate the temperature knob through its full range of movement to make sure that the full range of water temperatures can be selected 23 Commissioning Checks Temperatures should always be recorded with a thermometer with proven accuracy 1 2 3 Check inlet pipework temperatures for correct function of checkvalves i e that hot water does not cross flow into the cold supply and vice versa Check that the supply pressures are within the operating pressures for the valve Make sure that all connections and mixer body are water tight Exercise the thermostat a make sure that the hot and cold water are available at the valve inlets and the
19. e PACK CONTENTS L1 Tick the appropriate boxes to familiarize yourself with the part names and to confirm that the parts are included Form Mixing Valve 1 x Valve Assembly Ol with building in shroud fitted gt 1 x 3mm Hexagonal key O l 1 x RAC Elbow L 1 x 2 5mm Hexagonal Key O 1 x Outlet Support Plate Ol 1 x Wall Clamp Nut with foam seal 1 x Flow Regulator O 1 x Right Angled Connector L with O seal RAC 1 x Concealing Plate O 3 x Compression Nuts Ol ZO 3 x Olives 6 x Countersunk L Y y Fixing Screws y y y 6 x Countersunk L Y Y lt Short Bolts exwaiPusO SSS PLS Form Fittings 2 x Wall Plugs L XF E 2 x End Supports Ol D MEN 1 x Slidebar O 2 x Hose Seals L Ends O Documentation 1 x Installation Operation and Maintenance Guide 1 x Customer Support Brochure p Y 1 x Outlet Support Plate O with low capacity sprayplate fitted 1 x High Capacity Sprayplate O 1 x Flexible Hose L 1 x Clamp Bracket Ol 1 x Soapdish O 2 x Fixing Screws O 0 2 x End Plugs Ol a O El 251 mm 184 5 mo 00 62 mm y i 6 21 mm when front mounted onto Sonim EE a solid stud wall 4 19 mm when 310 mm rear mounted onto a panel wall 100 mm O el 75 mm
20. e cost You will have the assurance of a Mira trained engineer agent genuine Mira spares and a 12 month guarantee on the repair Payment should be made directly to the Service Engineer Agent using Visa MasterCard or a cheque supported by a banker s card To contact us England Scotland amp Wales Mira Showers Customer Services Telephone 0870 241 0888 8 30 am to 5 00 pm Working days 4 30 pm Friday 8 30 am to 12 30 pm Saturday E mail technical O mirashowers com Fax 01242 282595 By Post Cromwell Road Cheltenham Gloucestershire GL52 5EP Northern Ireland Wm H Leech amp Son Ltd Telephone 028 9044 9257 Mon to Fri 9 am 5pm Fax 028 9044 9234 Post Maryland Industrial Estate Ballygowan Road Moneyreagh Co Down BT23 6BL Republic of Ireland Modern Plant Ltd Telephone 01 4591344 Mon to Fri 9am to 5pm Fax Dublin 01 4592329 Post Otter House Naas Road Clondalkin Dublin 22 mira OS SHOWERS FM 14648 O Kohler Mira Limited October 2005
21. e mixed outlet water piping should not exceed 2 m and the overall length from the hot water circuit to the discharge point should not exceed 5 m Supply pipework layout should be arranged to minimise the effect of other outlet usage upon the maintained pressures at the mixing valve inlets Inlet and outlet threaded joint connections should be made with PTFE tape or liquid sealant Oil based non setting jointing compounds should not be used To eliminate pipe debris it is essential that supply pipes are thoroughly flushed through before connection to the mixing valve 13 Reversed Inlet Supplies It is essential the inlet supplies correspond with the red and blue markings on the thermostatic cartridge for the Mira Form to operate correctly The shower control is supplied with the inlet connections configured hot left cold right If the existing hot and cold pipework makes this configuration inconvenient the cartridge inlets can be reversed The connections can be altered by rotating the thermostatic cartridge through 180 before or after installation is complete 1 gt If the mixing valve body has already been installed turn off the supplies to the mixing valve and open the flow control This will release the trapped water pressure and assistin draining residual water Remove the knob and cover assemblies Refer to section Maintenance Removing Fitting Knob and Concealing Plate Assemblies With the removal clip still in pl
22. ed individually service condition should be assessed as part of the performance check refer to Commissioning Checks When renewing the thermostatic cartridge retain the temperature spindle removal clip and head nut off the displaced unit and refit Examine all accessible seals for signs of deformation or damage and renew as necessary taking care not to damage seal grooves a Service Pack is available containing all seals and strainer screens that may be necessary for renewal during maintenance or servicing Lightly coat all rubber seals with a silicone only based lubricant to assist reassembling see lubricants 34 Reassembly 11 Identify which is the hot inlet to the shower control body and align the thermostatic cartridge accordingly Carefully push the thermostatic cartridge back into the body checking that the 2 cartridge inlet port seals remain in place and locate the cartridge lugs into body slots Carefully align and then tighten the head nut do not overtighten max Torque 2 5 Nm 1 85 Ibf ft Fit the removal clip to the head nut Turn the flow control to the off position and restore hot and cold supplies Check for any leaks Refit the plate and lever assemblies refer to section Maintenance Removing Fitting Knob and Concealing Plate Assemblies The maximum temperature will now need resetting refer to section Commissioning Temperature pes bl Thermostatic ee Cartridge Locknut Trim
23. ied 12 Make sure that the protective cap is fitted to the outlet on the RAC elbow and place the building in shroud over the valve 13 Plaster and tile up to the edge of the building in shroud Make sure that the finished wall surface falls somewhere between the two lines marked on the shroud 14 When the wall surface has been completed remove the building in shroud and outlet cap If necessary cut the shroud to help removal 15 Turn on the hot and cold supplies and check for leaks Bracket 16 Fitthe concealing plate and secure with Protective O the control knob and outlet assemblies Cap Refer to section Maintenance Building in Shroud Q Removing Fitting Knob and Concealing Plate Assemblies 17 Shower Fittings Installation 1 8 Drill the two 7 0 mm fixing holes for the slidebar at 600 mm centres avoiding any buried cables or pipes and insert the wall plugs Assemble the clamp bracket components Push the plastic slidebar ends into the slidebar Push the slidebar through the clamp bracket assembly and soapdish Fit the bottom end support loosely to the wall Insert the fixing screw into the countersunk hole of the slide bar end and through the slidebar support Place the screw through the top end support and fully tighten Fully tighten the bottom end support Fitthe end support caps overthe ends of the slidebar end supports Screw the hose onto
24. imum Flow Rate 8 I min at mid blend with equal dynamic supply pressures Recommended Maximum Flow Rate 200 I min at mid blend which equates to maximum pressure loss of 3 5 bar Maximum Pressure Loss Ratio should not exceed 10 1 in favour of either supply during flow Maximum Static Pressure is 10 bar Recommended maximum flow velocity in pipelines is 2 metres second Pressure Loss Ratio is determined by subtracting the resistance of the outlet pipework and outlet fittings from the dynamic pressures of the hot and cold water at the inlets of the mixing valve This is at its extreme when the mixing valve is used at its lowest flow rate and when the maximum inequality occurs in the pressure of the hot and cold water supplies Mira Form Thermostatic Shower with Fittings Flow Rate Pressure Loss Graphs Mira Form with the low capacity sprayplate fitted to the handset Maintained supply pressures are equal and outlet temperature set to mid blend Pressure Loss bar 5 0 4 0 3 0 2 0 1 0 Force Economy Start Soothe 0 5 10 15 20 Flow Rate litres minute 25 Mira Form with the high capacity sprayplate fitted to the handset 30 Maintained supply pressures are equal and outlet temperature set to mid blend Pressure Loss bar 5 0 4 0 3 0 2 0 Economy Soothe
25. ity Systems This Manual covers all Mira Form Thermostatic mixing valves manufactured from March 2001 The Mira Form Shower Valve is a thermostatic shower control with independent selection for temperature and spray force and is suitable for connection to concealed pipework Mira Form Built in with 15 mm compression inlet outlet connections Supplied hot left cold right but can be reversed SAFETY WARNINGS This Form Thermostatic Shower Control is precision engineered and should give continued safe and controlled performance provided 1 It is installed commissioned operated and maintained in accordance with manufacturers recommendations 2 Periodic attention is given when necessary to maintain the product in good functional order 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 supervisors 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 If you experience any difficulty with the installation or operation of your new shower control then please refer to Fault Diagnosis before contacting Kohler Mira Limited Our telephone and fax numbers can be found on the back cover of this guid
26. lly service condition should be assessed as part of the performance check refer to section Commissioning Commissioning Checks Examine accessible O seals for signs of deformation or damage and if necessary renew the cartridge Lightly coat all seals with a silicone only based lubricant to assist reassembling Reassembly 9 10 11 12 Check that the flow cartridge seals are in place Align and screw the cartridge into place Fit the splined adaptor the headnut and the flow spindle Turn the flow control to the off position Rotate the flow control fully clockwise Restore hot and cold supplies and check for leaks Refit the lever knob and concealing plate assemblies Refer to section Maintenance Removing Fitting Knob and Concealing Plate Assemblies Flow Cartridge Splined Adaptor Headnut Flow Spindle Flow Cartridge Removal 36 Checkvalve Cartridges Cleaning Renewal of Parts Hot water entering the cold supply or vice versa indicates the checkvalve cartridge needs immediate attention 1 Turn off the supplies to the shower control Open the flow control to release the trapped water pressure and assist draining the residual water 2 Remove the control knob and concealing plate assemblies Refer to section Maintenance Removing Fitting Knob and Concealing Plate Assemblies 3 Undo the cartridge head usi
27. ng a 12 mm A F wrench and pull the whole cartridge free from the valve body Checkvalve Caution Some water may be released at Cartridges this point 4 The checkvalve cartridge assemblies may be cleaned by removing the rubber retainers and inlet strainers and flushing through under a jet of water to remove lodged particles Do not descale Check if the checkvalve o cartridge operates correctly If the cartridge is damaged or fails to operate correctly renew o 5 Lightly wipe external seals and threads with a silicone only based lubricant to aid Cartridge Location refitting 6 Refit cartridges strainers and retainers Do not overtighten the cartridge heads when refitting 7 Turn the flow control fully clockwise to the off position Restore the water supplies and check for leaks 8 Follow the steps outlined in section Maintenance Removing Fitting Knob and Concealing Plate Assemblies to reassemble the shower control Strainer Checkvalve Cartridge Rubber Retainer Checkvalve Cartridges 37 Inlet Strainers Cleaning Renewal of Parts Blockage of the inlet strainer screens can lead to poor flow performance and reduced temperature control lt is essential that the inlet strainer screens are periodically cleaned or if necessary renewed as part of a preventative maintenance programme A Strainer pack is available for the Mira Form containing 2 strainer sc
28. nge can be selected 32 Fit the locknut trim with the flat Locknut facing outwards Trim Concealing from the valve Plate 17 Headnut Spindle O Seal i gt ie Inner L E Bush CO E O O Seal Grub Screw Temperature A Lever Cover Knob and Screw Refit the temperature knob in the maximum E G temperature position l Refit the flow knob in the off position Refitting Control Knobs Fitting the Concealing Plate Assembly Concealing P Plate 1 Fit the concealing plate to the valve and secure with the temperature and control knobs Refer to section Maintenance Fitting the Knob Assembly for detailed instructions s i Note If the wall surface or tiling is a AO uneven the foam outer seal on the concealing plate may need supplementing with silicone sealant to ensure a watertight seal 2 Fit the wall clamp nut Make sure that the foam outlet seal is fitted between the wall clamp nut to create a watertight seal between the nut and the Y concealing plate A OL O Seal Wall Clamp Nut 3 Fit the RAC to the wall clamp nut and ee secure with the grubscrew Make sure that the O seal is fitted to the wall clamp nut 4 Check that the control knobs rotate fully and that the temperature and flow A SAN controls operate correctly 33 Maintenance Procedure Thermostatic Cartridge Removal 1 2 4
29. o visit If later the performance of your shower declines consult this manual to see whether simple home maintenance is required Please call our Customer Services to talk the difficulty through request 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 Mira Showers Kohler Mira Ltd Cromwell Road Cheltenham GL52 5E P3704 3 Mira is a registered trade mark of Kohler Mira Limited The company reserves the right to alter product specifications without notice P www mirashowers com Spare Parts We maintain an extensive stock of spares and aim to have functional parts available for ten years from the date of final manufacture of the product Spares can be purchased from approved stockists or merchants locations on request or direct from Customer Services Spares direct will normally be despatched within two working days Payment can be made by Visa or MasterCard at the time of ordering Should payment by cheque be preferred a pro forma invoice will be sent Note In the interests of safety spares requiring exposure to mains voltages can only be sent to competent persons Service Our Service Force is available to provide a quality service at a reasonabl
30. onnected as described in the INSTALLATION section INSTALLATION REQUIREMENTS Key to Symbols gt ae Float operated valve Isolating Valve O Mixing Valve Overflow gt lt Pressure Reducing Valve 690 Twin Impeller Pump Single Impeller Pump XI Tempering Valve gt Mini expansion vessel Gravity Fed Shower The shower MUST be fed from a cold water cistern and hot water cylinder providing nominally equal pressure 10 Gas Heated Shower The shower MUST be installed with a gas water heater or combination boiler of a fully modulating design A modulating boiler is one that the draw off rate is indirectly controlling the gas flow to the boiler producing a relatively constant hot water temperature Cold Hot Unvented Mains Pressure Shower The shower can be installed with a unvented stored hot water cylinder Only a competent person as defined by the Building Regulations may fit this type of system Safety devices gt lt not shown f for clarity N Jl 22 I i I I 11 Mains Pressurised Instantaneous Hot Water Shower The shower installed with systems of this type is supplied hot water via a tempering valve this provides relatively constant hot water and the shower will compensate for temperature changes should they occur
31. orce and an economy setting Start OOO 1 Start Spray Af Turn the adjuster ring until the three I amp f i dots align with top centre of the Po handset Water will flow from the outer set of holes 2 Soothe Spray Turn the adjuster ring until the two dots align with top centre of the handset Water will flow from the middle set of holes 3 Force Spray Turn the adjuster ring fully anticlockwise The single dot will align with top centre of the handset Water will flow from the inner set of holes 4 Economy Spray Setting Economy Setting O Turn the adjuster ring fully clockwise A The oval symbol will align with top Hl Sono centre of the handset Water will flow EE Ss from the outer set of holes and the flow rate will be reduced 26 FAULT DIAGNOSIS Symptom Cause Rectification 1 Only hot or a Inlet supplies are reversed refer to section Installation cold water Reversed Inlet Supplies Check from outlet b No hot water reaching shower control Check c Check strainers and inlet outlet fittings for blockage d Refer to symptom 5 below e Installation conditions continuously outside operating parameters refer to section Specifications and 2e below 2 Fluctuating Normal function of thermostatic control when operating or reduced conditions are unsatisfactory flow rate a Check strainers and inlet outlet fittings for flow restriction b Make sure that minimum flow
32. r e g plaster and tiles applied to cover overthe wall mounting plate and fixing screws Rear Mounted 4 mm to 19 mm thickness To fit the Form shower control to the rear face of the panel the panel thickness including plaster and tiles must be between 4 mm and 19 mm 1 Remove the control knobs and building in shroud from the valve Refer to section Maintenance Removing Fitting Knob and Concealing Plate Assemblies Put the building in shroud in the correct position on the wall and draw around it with a pencil Cut out the hole in the panel 2 Peel off the backing on the adhesive side of the foam outer seal and fix the seal in the machined groove on the back of the concealing plate 3 Fit the compression nut and olive onto the RAC elbow and fit to the valve Before tightening the compression fitting make sure that the pipe is pushed all the way into the valve outlet and the elbow outlet is inline with the control knobs otherwise the elbow will fail to line up with the hole in the concealing plate Fit the outlet support bracket to the elbow and secure with the wall clamp nut 4 Using the valve as a template mark and drill the 6 fixing holes to secure the mounting bracket and the outlet support bracket in position If no further finishing surface is to be added to the panel use the six inner fixing holes to mount the valve The concealing plate will cover the fixing screws when fitted Inner Fixing Holes 1
33. rate is sufficient for supply conditions c Make sure that dynamic inlet pressures are nominally balanced and sufficient d Make sure that inlet temperature differentials are sufficient e Subsequent to rectification of supply conditions Check thermostatic performance renew thermostatic cartridge if necessary No flow from a Check strainers and inlet outlet fittings for blockage shower b Hot or cold supply failure thermostat holding correct shutdown control function rectify and refer to symptom 2 e above outlet c Flow control cartridge faulty Check and renew if necessary Blend Indicates operating conditions changed temperature a Refer to symptom 2 above drift b Hot supply temperature fluctuation c Supply pressure fluctuation Hotwaterin Indicates checkvalves require maintenance refer to section cold supply Maintenance or vice versa Maximum a Indicates incorrect maximum temperature setting refer to blend section Commissioning temperature b As symptom 4 above setting too c As symptom 5 above hot or too cool Symptom Cause Rectification 7 Water leaking from shower control body Seal s worn or damaged a Obtain service pack and renew all seals b If leak persists from around temperature spindle Renew thermostatic cartridge 8 Flow knob or temperature knob stiff to operate a Impaired free movement of internal components
34. reens and 2 retainers 1 Turn off the supplies to the shower control Open the flow control to release the trapped water pressure and assist draining the residual water 2 The strainers are located at the inlet of each checkvalve cartridge Remove the cartridges to allow access 3 Carefully remove the strainers Clean under a jet of water or renew if damaged 5 Refit cartridges strainers and retainers Do not overtighten the cartridge heads when refitting 6 Turn the flow control fully clockwise to the off position Restore the water supplies and check for leaks 7 Follow the steps outlined in section Maintenance Removing Fitting Knob and Concealing Plate Assemblies to reassemble the shower control gt Strainer Checkvalve Cartridge Rubber Retainer Cartridge Head Inlet Strainers 38 Shower Fittings Spray Plate Assembly Removal and Installation Removal 1 Turn the adjuster anticlockwise ring fully Unclip and remove the adjuster ring Unscrew the spray plate in an anti clockwise direction The O seals will provide some resistance Installation Make sure that the four O seals are located correctly Turn the flow divertor fully clockwise Caution Do not over tighten the spray plate Carefully screw the spray plate assembly on to the flow divertor The O seals will resist the rotation of the spray plate There should be a gap between the edge of the spray plate
35. return your completed registration card 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 in Northern Ireland and Republic of Ireland Service under this guarantee does not affect the expiry date The guarantee on any exchanged parts or product ends when the normal product guarantee period expires Not covered by this guarantee 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 modified by any person not authorised by Mira Showers or our approved agents This guarantee is in addition to your statutory and other legal rights Before using your shower Please take the time to read and understand the operating and safety instructions detailed in this manual What to do if something goes wrong If when you first use your shower it doesn t function correctly first 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 difficulty simply contact our Customer Services who will give every assistance and if necessary arrange for our service engineer t
36. the handset and the outlet of the shower control Make sure the hose seals are fitted Do not overtighten Place the handset into the slidebar clamp bracket End Support HE Slidebar End Fixing Screw End Support Cap Clamp Bracket Assembly 600mm Ns LA S Suwa s Le Note The clamp bracket is tapered The handset will only fit properly from one direction If necessary turn the end of the clamp bracket until the handset will fit If the clamp bracket pivots downwards under the weight of the handset the central securing screw in the bracket will require tightening to hold the handset in position Flow Regulator Installation For high pressure installations an optional flow regulator is supplied Fitting the regulator will limit the flow to 10 l min and reduce the spray force to a more comfortable level The regulator may also be fitted if water conservation is a concern 1 Unscrew the outlet nipple from the RAC with a 12 mm A F wrench not supplied Fit the flow regulator as illustrated Make sure the O seals are fitted and the regulator is the correct way up Refit the outlet nipple to the RAC 18 RAC Direction of Waterflow Flow Regulator Outlet Nipple Installation Panel walls The Mira Form can be installed through a laminated panel or shower cubicle from either the front or the rear of the panel If fitted from the front the panel must have a further finishing laye
37. uring plastering 1 Decide on a suitable position for the shower control and fittings Ideally the a AO shower should be fitted at a convenient 7 O height for all the family facing down the centre line of the bath or across Hot water the shower cubicle opening inlet falling 2 Determine whether the hot or cold water Si N i pply supplies will connect to the shower control from the top falling or from the bottom rising 3 Remove the control knobs and the building in shroud from the valve Refer to MAINTENANCE for detailed instructions on Removing Fitting Knob and Concealing Plate Cold water inlet falling or rising supply Assemblies Familiarise yourself with the hot and cold inlets for the valve Fit the compression nut and the olive onto the RAC elbow and fit to the valve Before tightening the compression fitting ensure the pipe is pushed all the way into the valve outlet and the elbow outlet is inline with the control knobs otherwise the elbow will fail to line up with the hole in the concealing plate Peel off the backing on the adhesive side of the foam outer seal and fix the seal in the machined groove on the back of the concealing plate 15 45 mm e Compression Sut and Olive RAC Elbow Elbow Outlet Concealing Plate Foam Outer Seal Mark the route of the inlet pipework and the approximate shape of the recess Remove the plaster and brickwork dry lining to the required
38. ximum of 13 mm thick Follow the instructions in section Installation solid and dry lined walls to install the shower control and fittings Refer to section Commissioning before operating the shower control Laminated Panel maximum thickness 13 mm Concealing Plate Foam Seal x lt eens Plate Ss Locknut Control Knob Outlet Support Bracket and Trim Assembly If the shower is front panel mounted a further finishing Be A surface 6 mm to 21 mm thick a Fe So must be applied to the panel Outlet Seal Wall Clamp Nut K i Right Angle Connector 21 COMMISSIONING Commissioning must be carried out in accordance with these instructions and must be conducted by designated qualified and competent personnel Exercising the Thermostat Thermostatic mixing valves with wax thermostats are inclined to lose their responsiveness if not used Valves which have been in storage installed but not commissioned or simply not used for some time should be exercised before setting the maximum temperature or carrying out any tests A simple way to provide this exercise is a make sure that the hot and cold water are available at the valve inlets and the outlet is open b move the temperature control rapidly from cold to hot and hot back to cold several times pausing at each extreme Maximum Temperature The maximum blend temperature obtainable by the user should be limited to prevent accidental
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