Mira Orbis Thermostatic Electric Shower Installation and User Guide These instructions are to be left with the user
Contents Patents and Design Registration........................................................... 2 Introduction.............................................................................................. 3 Important Safety Information.................................................................. 4 Warning!................................................................................................ 4 Caution!.........................................................................................
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/flow adjustment. A unique thermostatic valve stabilises temperature changes caused by water pressure fluctuations. These can result from taps being turned on or off, or toilets being flushed.
Important Safety Information Installation must be carried out in accordance with these instructions, and must be conducted by designated, qualified and competent personnel. Warning! Follow all warnings, cautions and instructions contained in this guide, and on or inside the appliance. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.
Caution! 1. 2. 3. 4. 5. Read all of these instructions and retain this guide for later use. 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, specified by the local electricity supply company.
Pack Contents Checklist Tick the appropriate boxes to familiarise yourself with the part names and to confirm that the parts are included.
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.
• 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 flexible outlet fittings. However, there will be occasions when it will not provide a suitable solution.
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.
Consumer Unit Double-pole Isolating Switch 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. Cover Retaining Screw Remove the three cover retaining screws.
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. Two case inserts are supplied with the Mira Orbis, so that they can be trimmed to suit the supplies entering the product. Before fitting the cover, make sure that the case inserts are fitted.
Feed cable into Case. Fit Earth sleeve (not supplied) and strip insulation. Do not twist cable cores. Important! Make sure that the inlet earth wire is routed as shown. Failure to do so may cause product malfunction. L = BROWN E = GREEN/YELLOW Firmly connect the conductors. Do not exert strain on the terminal block. N = BLUE Before refitting the cover, pull the plastic tab off the battery to activate it. Cover Retaining Screw Refit the Service Tunnel.
Holes For Cover Retaining Screws Case Insert Fixing Screw Terminal Block Heater Tank Electrical Supply Cable Inlet Connector Assembly Cold Water Supply Pipe (Bottom Entry) Service Tunnel 13
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. 1. 2. 3. Electrical supply is turned off at the mains. Turn control to full cold. Turn the water supply fully on. 4. 5. 6. 5 - 10 Secs Check for water leaks. Switch on the electrical supply and press the ‘Start/Stop’ button 7. 8.
10. 11. 12. 0 - 10 Secs Turn control to full cold. Press the ‘Medium’ button, light on the button comes on 13. 14. The temperature will rise slightly as indicated by the temperature indicator. 5 - 10 Secs Press the ‘High’ button, light on the button comes on 15. The flow rate will increase. 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.
17. 18. 0 - 5 Secs The shower will purge water from its tank for a few seconds. Residual water may drain over a few minutes. 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. User Instructions How Your Electric Shower Works Heated water is produced by adjusting the flow of cold water passed through a heater tank.
The Effect of Seasonal Changes 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 Other Water Devices Example of how shower temperature stabilises due to pressure changes. Water inlet pressure fluctuations due to other draw offs (e.g. flushing toilet).
Using your Shower Read the section “Important Safety Information” first.
1. Temperature of Shower 2. Clock 3. The temperature indicator becomes illuminated. Switch on the electrical supply and press the ‘Start/ Stop’ button 4. Check water temperature before entering shower. Set to desired position. 5. Allow 10 - 15 seconds for any temperature adjustments to reach the handset. 7. 6. Press STOP button, light on the button goes out. Shower flow will continue for a few seconds before stopping. Switch off the electrical supply. Residual water may drain over a few minutes.
Clock Setting Clock Medium Power Pushbutton 20 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 flashing 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 flashing. 6.
LCD Indications The table below shows what is shown on the LCD display once the shower has been installed and is in use. Product State LCD Display Backlight Comments Off Blank Off Product turned off at pull cord Standby Clock shown including second indicators Dim Product turned on Clock Shown via Start/Stop button including second indicators Full Brightness On initial start up unit will turn onto low power.
Fault Diagnosis The trouble shooting information tabled below gives details on probable causes and remedies should difficulties be encountered whilst the shower is in operation. Warning! There are no user serviceable components beneath the cover of the appliance.
Symptom LCD Back Low Flow Light Heater Setting Probable Cause Probable Remedy ON OFF Medium/High Thermostatic mechanism is faulty or damaged. Replace. ON OFF Medium/High Scaled Heater Tank Assy. Replace. ON OFF Medium/High Damaged Hose. Replace. OFF OFF Insufficient water supply pressure for shut off. The minimum static pressure to ensure shut off and prevent dripping is 0.2 bar. Note! If other appliances are operating, static pressure may drop below 0.2 bar.
Symptom LCD Back Low Flow Light Heater Setting Light Probable Cause Probable Remedy Low/Medium/ High Low or no flow rate ON OFF Any Handset blocked. Remove and clean. ON OFF Any Heater tank excessively scaled. Replace. In hard water areas consider the use of a water softener. No information shown on LCD display ON OFF Any Faulty Control PCB. Replace Control PCB. Operation of temperature control has little or no effect on water temperature.
Symptom LCD Low Flow Light Heater Setting ON ON ON Back Probable Cause Probable Remedy Medium/High Insufficient water supply. Contact local Water company. OFF Medium/High Possible failure of the thermal switch. Check the continuity of the heater tank and replace parts as necessary. Light Appliance fails to produce hot water when set on ‘Medium/High’ heater setting. Low/Medium/ High ON OFF Medium/High Heater tank failure. Replace. Unable to select a cool enough shower.
Maintenance Handset - Cleaning Clean with mild washing up detergent or soap solution. Wipe dry with a soft cloth. Poor shower performance can be avoided by cleaning the spray plate. Use thumb or soft cloth to wipe rubber nozzles. The handset must also be descaled regularly. Inlet Filter - Cleaning/Renewing Cover Retaining Screw Read the section “Important Safety Information” first Make sure that the electrical supply is turned off at the mains and that the water supply is fully turned off.
Clock Battery Replacement Procedure Warning! There are no user serviceable components beneath the cover of the appliance. Only a competent tradesperson should remove the front cover! Read the section “Important Safety Information” first. 1. 2. Isolate the electrical supply before commencing this procedure. The electricity must be turned off at the mains and the appropriate circuit fuse removed, if applicable. Mains connections are exposed when the cover is removed. Remove the three screws.
Spare Parts Mira Orbis 405.58 406.27 416.38 416.51 1563.518 1563.522 1563.541 1647.095 1647.096 1647.098 1647.099 1647.100 1647.101 1647.102 1647.103 1647.104 1647.105 1647.106 1647.107 1647.108 1647.109 1647.110 1647.148 1647.149 1647.
1647.109 A B A A 1647.096 1647.105 B 1647.098 1647.099 1647.100 1647.103 A B 406.27 A 1647.109 1647.150 405.58 A 1647.102 416.38 A 416.51 1647.108 1647.107 1647.149 1647.106 29 1647.101 1647.104 1647.
Dimensions Wiring Diagram 30
Customer Services 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 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.
Mira is a registered trade mark of Kohler Mira Limited. The company reserves the right to alter product specifications without notice. www.mirashowers.
