For SPARES, ADVICE or REPAIRS Please call us on 0844 571 5000 (UK Only) MIRA DISCOVERY THERMOSTATIC MIXER Installation and User Guide These instructions are to be left with the user 1
CONTENTS Introduction.............................................................................................. 3 Patents and Design Registration........................................................... 4 Safety : Warnings..................................................................................... 5 Pack Contents.......................................................................................... 7 Specifications............................................................................
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 Discovery Thermostatic Mixer is a Thermostatic Shower Control with separate flow and temperature controls. A 12 L/Min flow regulator is supplied for high pressure systems to reduce excessive shower force.
Patents and Design Registration Patents: GB: Euro: Germany: France: USA: 2 291 693, 2 392 225, 2 421 297 1 672 257 DE FR GB IT NL SE 695 13 455.8 0 694 721 7 240 850 Patent Applications: Euro: USA: 03254070.0 2006-0124758-A1, 11/804 631 Design Registration 000351887-0001-0006 Guarantee Mira Showers guarantee the Mira Discovery against any defect in materials or workmanship for a period of five years from the date of purchase.
SAFETY : WARNINGS 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 supervisor’s 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.
9. Children should be supervised to make sure that they do not play with the appliance. 10. Care is required when adjusting flow or temperature, make sure that the temperature has stabilised. Rapid/excessive movement of the flow and/ or temperature control levers may result in momentary changes in blend temperature. 11. When this product 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.
PACK CONTENTS Tick the appropriate boxes to familiarise yourself with the part names and to confirm that the parts are included. Exposed Discovery Thermostatic Mixer 1 x Mira Discovery Thermostatic Mixer 2 x Concealing Plates 2 x 15 mm Compression Nuts 1 x O-Key 2 x 15 mm Olives 1 x 12 L/Min Flow Regulator 2 x Concealing Caps (Note! see section: Type 2 Valves - Application) 1 x 2.
Built-in Discovery Thermostatic Mixer 1 x Mira Discovery Thermostatic Mixer 1 x Control Assembly (attached to the Building-in Shroud) 3 x 15 mm Compression Nuts 1 x O-Key 3 x 15 mm Olives 2 x Wall Plugs 1 x 12 L/Min Flow Regulator (Note! see section: Type 2 Valves - Application) 2 x Securing Screws 1 x 2.
SPECIFICATIONS Operating Parameters For Type 2 Valves, the supply conditions specified in the TMV2 Requirements Manual take precedence over the operating parameters which follow. Pressures • Max Static Pressure: 10 Bar. • Max Maintained Pressure: 5 Bar. • Min Maintained Pressure (Gravity System): 0.1 Bar. (0.1 bar = 1 Metre head from cold tank base to shower handset outlet). Note! For gravity fed / other low pressure systems (0.5 bar or below) do not fit the flow regulator.
Thermostatic Shut-down • For safety and comfort the thermostat will shut off the mixing valve within 2 Seconds if either supply fails (achieved only if the blend temperature has a minimum differential of 12°C from either supply temperature). Connections • Inlets: 15 mm Compression. • Outlet: ½” BSP Flat Face / 15 mm Compression • Standard connections are: hot - left, cold - right, outlet - bottom (EV models), top (BIV models).
Dimensions Exposed Discovery Shower Control 153 131 106 70 Ø56 35 Built-in Discovery Shower Control 20 67 - 85 67 Ø183 Building-in Depth Dimensions in mm 11
INSTALLATION Suitable Plumbing Systems Gravity Fed: The thermostatic mixer must be fed from a cold water cistern (usually fitted in the loft space) and a hot water cylinder (usually fitted in the airing cupboard) providing nominally equal pressures. Mains Pressurised Instantaneous Hot Water System (Combination Boiler): The thermostatic mixer can be installed with systems of this type with balanced pressures. (Recommended Minimum Maintained Pressure: 1.0 Bar).
8. The water supplies to this product must be isolated if the product is not to be used for a long period of time. If the product or pipework is at risk of freezing during this period they should also be drained of water. 9. All pipework must be checked for leaks before the product installation is completed. The mixer should be pressurised and the inlet & outlet connections inspected.
Installation Methods Exposed Discovery Shower Control The Exposed Discovery Shower Control can be installed with Rear, Rising or Falling Supply Inlets. For Rear Entry Supplies, go to section: ‘Exposed Shower Control, 1. Rear Supplies’. For Rising or Falling Supplies, go to section: ‘Exposed Shower Control, 2. Rising or Falling Supplies’.
Exposed Shower Control 1. Rear Supplies 1.1 Use the Installation Template to mark the positions of the holes for the Backplate and the pipe centres. Note! Allow a minimum of 150 mm either side of the Shower Control, to allow the hot and cold inlet Compression Nuts to be tightened with the Spanner supplied. 1.2 For solid walls drill the Backplate holes with a 6 mm drill and fit the Wall Plugs (supplied). For other types of wall structure alternative fixings (not supplied) may be required. 1.
1.9 1.10 1.11 1.12 1.13 Caution! It is essential at this point that the supply pipework is thoroughly flushed through before connection to the Shower Control. Failure to do so may result in product malfunction. Put the Compression Nuts and Olives onto the pipework. Remove the Elbow Shrouds from the Shower Control. Align the Shower Control with the pipework and fit onto the Backplate. Tighten the Compression Nuts onto the Shower Control with the Spanner (supplied).
2. Rising or Falling Supplies 2.1 Remove the Elbow Shrouds from the Shower Control. 2.2 Rising Supplies: Loosen the Grubscrew on each Elbow using the 2.5 mm hexagon key (supplied) and pull off the Elbows from the Shower Control. Refit each Elbow on the opposite side and rotate 90° as required. Retighten the Grubscrews. Caution! Do not overtighten. Falling Supplies: Loosen the Grubscrew on each Elbow using the 2.5 mm hexagon key (supplied) and rotate the Elbows 90° as required. Retighten the Grubscrews.
2.7 Attach the Backplate to the wall using the Fixing Screws (supplied). Note! The Grubscrew should be at the bottom. Caution! It is essential at this point that the supply pipework is thoroughly flushed through before connection to the Shower Control. Failure to do so may result in product malfunction. 2.8 Fit the Connector Covers and ‘O’ Seals onto the pipework. 2.9 Fit the Compression Nuts and Olives onto the pipework. 2.10 Align the Shower Control with the pipework and fit onto the Backplate. 2.
Built-in Shower Control 1. Solid Wall or Stud Partition (Using Securing Brackets - Mounting off Front Face) 1.1 Determine the route for the hot and cold supply pipework and for the outlet pipework. When connecting to the BIV Shower Fittings it is recommended that the outlet be positioned above and to one side of the Shower Control. This is to prevent the Flexible Hose from obstructing the Shower Controls. 1.
1.7 Fit the Securing Brackets to the Shower Control. Important! Make sure that the correct holes are used, otherwise the Backplate cannot be fitted. Note! The Securing Brackets can be rotated for suitable fixing points. 1.8 Mark the positions for the Countersunk Fixing Holes on the wall. 1.9 For solid walls drill two 6 mm holes for the Wall Plugs. Caution! Do not drill into pipes in the wall. Backplate Securing Hole Backplate Securing Hole Countersunk Fixing Hole Outlet Pipe to Fittings 1.
1.14 Attach the Building-in Shroud to the Shower Control using the two Securing Screws. 1.15 Using the ‘Finished Wall Indicator’ on the Building-in Shroud as a guide, finish the wall. Caution! Make sure that the finished wall is within the maximum and minimum limits or the control components will not fit correctly. 1.16 Remove the Building-in Shroud. Retain the two Securing Screws for fitting the Backplate. 1.17 Fit the Shower Fittings, refer to your Fittings Installation and User Guide for instructions. 1.
2. Solid Wall or Stud Partition (Using Rear Fixing Points on Shower Control) 2.1 Refer to section: ‘1. Solid Wall or Stud Partition (Using Securing Brackets - Mounting off Front Face)’ and follow steps 1.1 to 1.4. 2.2 Cut away the plasterboard or brick work to the required depth. Important! This depth ‘X’ will depend on the finished wall thickness e.g. tiles or facia board. Refer to the table for this measurement. For stud partitions depth ‘X’ refers to the distance from the rear mounting e.g.
2.3 Mark the positions of the Fixing Screw holes on the wall. 2.4 For solid walls drill two 6 mm holes for the Wall Plugs. 2.5 Insert the Wall Plugs (supplied) and attach the Shower Control to the wall with the Securing Screws provided. Note! For stud partition installations alternative fixings may be required (not supplied) to fix the shower control to the rear face of the wall cavity or to a timber noggin. 2.6 Refer to section: ‘1.
3. Laminated Panels (Using Securing Brackets - Mounting off Rear Face) Note! For laminated panels the shower control must be positioned from the rear of the panel. Panel thickness must be between 4 and 12 mm (if a thicker panel is used, it will be necessary to recess the securing brackets into the rear of the panel). Important! Make sure that there is a minimum clearance of 64 mm behind the laminated panel to house the shower control. 3.
3.8 Fit the hot and cold supply pipes and tighten the compression nuts. Falling Supplies: For falling supplies loosen the grubscrew on each Elbow using the 2.5 mm Hexagon Key (supplied). Remove the Elbows and install on opposite sides. Secure the Elbows with the Grubscrews. Caution! Do not overtighten. Note! Make sure that the Filter Plugs are positioned to the front (i.e. Hexagonal Key facing forward).
Control Assembly Important! The Yellow lugs on the Flow Control must be in the fully clockwise (off) position in order to fit the Control Assembly. Note! The Flow Control Lugs on pre 2006 models are Black. 1. Rotate the Temperature Knob fully clockwise and carefully pull it off. 2. Remove the Grey Control Bearing. 3. Pull off the Flow Lever. 4. Remove the Flow Lever Adapter. Important! The Lever Retainer must not be removed. 5.
8. 9. Align the Green Temperature Hub with the Lever Retainer Clips as illustrated. Slide the Flow Lever Adapter over the Cartridge and onto the yellow lugs on the Flow Control, exactly as illustrated. 10. Push the Flow Lever onto the Flow Lever Adapter (align lugs as illustrated). 11. Push the Grey Control Bearing over the Lever Retainer. Note! Align the Grey Control Bearing with the Lever Retainer Clips and not the Flow Control Lever. 12.
REVERSED INLET SUPPLIES The Discovery Shower Control is supplied with inlet connections Hot-Left, Cold‑Right and Bottom-Outlet as standard. If the hot and cold water supply pipes have been reversed during installation the following procedure must be performed. 1. Isolate the hot and cold water supplies. 2. Operate the Flow Lever and Temperature Knob to drain any residual water. 3. Rotate the Temperature Knob fully clockwise and carefully pull it off.
11. Rotate the Cartridge 180° to reverse the inlets to the Cartridge. Caution! Make sure the two Cartridge Side Seals are not damaged. 12. Refit the Cartridge into the Shower Control Body, make sure that the lugs engage in the slots in the Body. Note! To assist in refitting the Cartridge, rotate 45° (i.e. with the inlet seals at 2 and 8 o’clock) and push into the Shower Control, then rotate to align the lugs with the slots in the body and push fully home (refer to illustration).
OPERATION Shower Control (Exposed and Built-in Controls) Note! The shower performance may be effected if other water appliances are operated whilst the shower is in use. Turn the Flow Lever Anticlockwise to the Preset Maximum Flow OFF Turn the Temperature Control Knob Clockwise to decrease the Temperature, or Anticlockwise to the Preset Maximum Temperature ON Sunburn or skin conditions can increase your sensitivity to hot water. Make sure that you set the shower to a cooler temperature.
COMMISSIONING The Thermostatic Shower Control is preset to approximately 43 °C at the factory. If adjustment is required, set the maximum temperature as follows: For Type 2 installations the maximum blend temperature is determined by the application, refer to the TMV2 Requirements Manual. Flow Rate Note! Make sure that any inlet isolating valves are fully open.
FAULT DIAGNOSIS Symptom 1. Cause / Rectification Only hot or cold a. water from the mixer outlet. b. c. d. e. 2. F l u c t u a t i n g o r a. reduced flow rate. b. Inlets reversed (hot supply to cold supply). Refer to section: ‘Reversed Inlet Supplies’. No hot water reaching the mixer. Check the filters for any blockage. Installation conditions outside operating parameters: refer to sections: ‘Specifications’ and ‘Commissioning’.
MAINTENANCE General The Mira Discovery Shower Control is designed to be maintenance free, as such there are no serviceable parts in the cartridge. However regular cleaning will keep the shower in pristine condition, refer to section: ‘Maintenance, Cleaning’. Filters are fitted to the inlets of the mixer to protect the cartridge and will give many years of trouble free showering. Filters should be checked at yearly intervals and cleaned or replaced to maintain optimum shower performance.
Filters - Exposed Models To clean or replace the inlet filters: 1. Isolate the hot and cold water supplies. 2. Operate the Flow Lever to drain any residual water. 3. Remove the Elbow Shrouds. 4. Unscrew the Filter Caps with the ‘O’ key (supplied) or a 12 mm hexagonal ‘O’ Key key. 5. Remove the Elbow Retaining Clips. 6. Carefully pull out the Inlet Filters. 7. Clean each filter in turn under a jet of water to remove any lodged particles. 8. Refit the Inlet Filters. 9.
Filters - Built-in Models To clean or replace the inlet filters: Note! Refer to the section ‘Installation, Control Assembly’ for illustrations. 1. Isolate the hot and cold water supplies. 2. O p e r a t e t h e F l o w L e v e r a n d Temperature Knob to drain any residual water. 3. Rotate the Temperature Control Knob ‘O’ Key fully clockwise and carefully pull it off.
SPARE PARTS Exposed Thermostatic Shower Control 090 95 Pipe Concealing Plates 1595 036 Temperature Hub Assembly 1595 037 Handle Pack 1595 038 Handle Adapter Pack 1595 039 Cartridge Assembly Pack (also includes components identified ‘D’) 1595 040 Body Trim 1595 041 Elbow Shroud Pack (Identified ‘A’) 1595 042 Elbow Pack Assembly (Identified ‘B’) 1595 043 Mounting Assembly Pack 1595 045 Outlet Nipple Pack 1595 047 Seal Pack (Identified ‘C’) 1595 048 Component Pack 1595 065 Filter (2 off) 1595 231 ‘O’ Key 1595
Built-in Thermostatic Shower Control 1595 036 Temperature Hub Assembly 1595 037 Handle Pack 1595 038 Handle Adapter Pack 1595 039 Cartridge Assembly Pack (Also includes components identified ‘B’) 1595 044 Concealing Plate Assembly 1595 067 Screw Pack (Identified ‘A’) 1595 070 Component Pack 1595 149 Outlet Nipple Pack 1595 231 ‘O’ Key 1595.283 Building-in Shroud 1609.046 Filter Pack x 2 (identified ‘B’) 1651.138 Seal Pack (Identified ‘C’) 1651.167 Elbow Assembly (pair) 1595.283 1651.
ACCESSORIES Genuine Mira accessories can be purchased direct from Customers Services (our contact details can be found on the back cover of this guide) or from approved stockists or merchants. Eco Showerhead White - 2.1668.001 Chrome - 2.1668.002 The Eco shower head gives you an invigorating shower, but reduces water consumption and heating costs. Everclear Showerhead White - 2.1616.030 Chrome - 2.1616.
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CUSTOMER SERVICE Guarantee Your product has the benefit of our manufacturer’s guarantee which starts from the date of purchase. To activate this guarantee, please return your completed registration card, visit our website or free phone 0800 0731248 within 30 days of purchase (UK only). Within the guarantee period we will resolve defects in materials or workmanship, free of charge, by repairing or replacing parts or product as we may choose.
