Related Manuals for Mira Crescent
Summary of Contents for Mira Crescent
- Page 1 SHOWER CONTROL Installation Operation &B Maintenance Guide THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER For latest prices and delivery to your door visit MyTub Ltd 0845 303 8383 www.mytub.co.uk...
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Page 2: Table Of Contents
INDEX Page SAFETY WARNINGS ADVICE INTRODUCTION DESCRIPTION PACK CONTENTS DIMENSIONS SPECIFICATION INSTALLATION REQUIREMENTS INSTALLATION COMMISSIONING OPERATION FAULT DIAGNOSIS MAINTENANCE SPARE PARTS CUSTOMER CARE Back Cover For latest prices and delivery to your door visit MyTub Ltd 0845 303 8383 www.mytub.co.uk... -
Page 3: Safety Warnings
SAFETY : WARNINGS The function of this thermostatic mixing valve is to deliver water consistently at a safe temperature. This requires that: It is installed, commissioned, operated and maintained in accordance with the recommendations given in this Manual. Periodic attention is given, as necessary, to maintain the product in good functional order. -
Page 4: Introduction
This Manual covers all Mira Crescent Thermostatic mixing valves manufactured from May 2001. DESCRIPTION The Mira Crescent thermostatic shower is a built-in shower control with a fixed spray head suitable for connection to concealed pipework. The Mira Crescent provides accurate temperature and flow control for single-point installations. -
Page 5: Pack Contents
PACK CONTENTS Tick the appropriate boxes to familiarize yourself with the part names and to confirm that the parts are included. 1 x Rigid Arm and Backplate Assembly 1 x Valve Body 1 x Building-in Shroud 1 x 6” Deluge head 1 x 8”... -
Page 6: Dimensions
DIMENSIONS DIMENSIONS 411 mm ø 55 mm 152mm (6”) 203mm (8”) 62 mm 150 mm max. Front mounted 6 mm min. onto wall 21mm max. Rear mounted 4 mm min. onto panel 19 mm max. 185 mm 89 mm 265 mm 235 mm For latest prices and delivery to your door visit MyTub Ltd 0845 303 8383 www.mytub.co.uk... -
Page 7: Specification
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. Operating Parameters... - Page 8 Mira Crescent with 8” Deluge Head :- Minimum Maintained Pressure: 0.2 bar. Recommended Maximum Maintained Pressure: 4.0 bar. (To prevent excessive flow rates with the Deluge Head supplied). *Pressure Loss Ratio is determined by subtracting the resistance to flow at the outlet (generally known as “back pressure”, and measured at the outlet of the mixing tap)
- Page 9 60-65°C where serving ablutionary applications. Minimum temperature differential between hot and outlet temperature: 12°C Flow Control The Mira Crescent shower control has integral flow control; no other user-operated flow control should be used with this shower control. Connections The shower control and shower head connections are all 15mm compression (nuts and olives are provided).
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Page 10: Installation Requirements
INSTALLATION REQUIREMENTS Key to Symbols Float operated valve Isolating Valve Mixing Valve Overflow Pressure Reducing Valve Twin Impeller Pump Single Impeller Pump Tempering Valve Mini expansion vessel Gravity Fed Shower - The shower MUST be fed from a cold water cistern and hot water cylinder providing nominally equal pressure. - Page 11 Unvented Mains Pressure Shower - The shower can be installed with an unvented, stored hot water cylinder. Only “a competent person” as defined by the Building Regulations may fit this type of system. 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...
- Page 12 Pumped Shower (Outlet Pump) - The built-in shower control can be installed with an outlet pump (single impeller). The pump MUST be located on 90° the floor near to the shower control. The layout and sizing of pipework MUST be such that 30°-60°...
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Page 13: Installation
Reversed Inlet Supplies It is essential the inlet supplies correspond with the red and blue markings on the thermostatic cartridge for the Mira Crescent 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. - Page 14 If the mixing valve body has already been installed, isolate the supplies to the mixing valve, and turn on the flow control. This will release the pressure and assist in draining the residual water. Remove the knob and cover assemblies. Refer to Removing/Fitting Knob and Concealing Plate Assemblies in the MAINTENANCE section for detailed instructions.
- Page 15 Installation The Mira Crescent can be built into solid, dry-lined, stud partition or dry partition wall structures. All plumbing connections are 15mm compression. A building-in shroud is supplied, which can provide a depth reference when chasing out the wall surface and protects the shower control during plastering.
- Page 16 Remove the control knobs and locknuts (refer to Removing/Fitting Knob and Concealing Plate Assemblies) and fit the building-in shroud over the valve. Mark the position of the wall mounting bracket fixing holes. Drill a 6.0 mm diameter hole at each of the marked positions and insert the wall plugs (supplied).
- Page 17 15. Screw the locknuts onto the valve until they firmly lock the concealing plate against the wall. This will compress the seal and prevent water ingress into the recess. 16. Refit the locknut shields and the knob assemblies. 17. Place the outlet wall bracket onto the outlet pipe and mark the positions of the three fixing holes.
- Page 18 Installation: - Panel (4 to 19 mm thickness) Rear Mounted The Mira Crescent incorporates a mounting bracket, enabling the valve to be in- stalled through a laminated panel or shower cubicle. The bracket must be in the correct orientation and mounted to the rear face of panels with a finished thickness of 4-19 mm .
- Page 19 Installation: - Panels (13 mm max. thickness) Front Mounted To fit the Crescent 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.
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Page 20: Commissioning
The maximum blend temperature obtainable by the user should be limited, to prevent accidental 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. - Page 21 - If the outlet temperature is set correctly then refer to Commissioning Checks. - If adjustment of the temperature is required, carry out the procedure shown below; Remove the temperature knob, the temperature shield and the locknut assemblies. Unlock and remove the temperature spindle. Use a 3 mm hexagonal wrench to undo the locking screw.
- Page 22 Commissioning Checks 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 range of operating pressures for the valve. All connections and mixer body are water tight.
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Page 23: Operation
OPERATION Turn the flow lever anticlockwise until the desired force of water is obtained. Note! When the Crescent 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. -
Page 24: Fault Diagnosis
FAULT DIAGNOSIS Symptom Cause/Rectification a. Inlet supplies reversed (see reversed inlets section). Check. 1. Only hot or b. No hot water reaching shower control. Check. cold water c. Check strainers and inlet/outlet fittings for blockage. from outlet. d. Refer symptom 5 below. e. - Page 25 Symptom Cause/Rectification 7. Water Seal(s) worn or damaged. leaking from a. Obtain service pack and renew all seals. shower b. (If leak persists from around temperature spindle) Renew control body. thermostatic cartridge. 8. Flow knob or a. Impaired free movement of internal components. Renew the temperature appropriate cartridge.
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Page 26: Maintenance
Should an internal malfunction occur then this will probably require replacement of parts. The designed minimum service life of all cartridges used in Mira products is 5 years providing the Mira Crescent is operated with the recommended operating conditions and within the recommended operating parameters. However, when... - Page 27 Maintenance Procedures Maintenance Procedure - Thermostatic Cartridge Removal Isolate the supplies to the shower control. Open the flow control to release the trapped water pressure and to assist in draining the residual water. Remove the temperature and flow knob assemblies, using the 2.5 mm A/F hexagonal wrench (supplied).
- Page 28 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 cartridge lugs into body slots. 12.
- Page 29 Cleaning/Renewal of Parts The inner surface of the shower control body must be clean before refitting 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 the cartridge.
- Page 30 Reassembly Check that flow cartridge seals are in place. Align and screw the cartridge into place. 10. Fit the splined adaptor, the headnut and the flow spindle. 11. Refit the control knob and concealing plate assemblies; Refer to Removing/ Fitting Knob and Concealing Plate Assemblies for detailed instructions. 12.
- Page 31 A Strainer pack is available for the Mira Crescent, containing 2 strainer screens and 2 retainers. Turn off the supplies to the shower control. Open the flow control to release the trapped water pressure and to assist in draining the residual water.
- Page 32 Strainer Checkvalve Cartridge Rubber Retainer Cartridge Head Checkvalve Cartridges Removing/Fitting Knob and Concealing Plate Assemblies Removal Concealing Plate Rotate the control knob either fully clockwise or anticlockwise. Locknut Unscrew anticlockwise the grub screw cover. Using a 2.5mm hexagonal key unscrew the grub screw and remove the knob.
- Page 33 Reassembly Ensure the support Fit the support bracket with the T section bracket is fitted with at the top. Fit the main seal with the the ‘T’ section at the smooth side facing the wall to ensure an top of the bracket. effective seal.
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Page 34: Spare Parts
SPARE PARTS Mira Crescent Spare Parts List 407.26 Cartridge Removal Clip 427.32 Checkvalve Assembly 427.33 Filter 427.48 Seal Pack - components identified 'A' 427.50 Compression Nut and Olive Pack 441.02 8” Deluge Head 441.03 6” Deluge Head 441.18 Screw Pack (not illustrated) 441.46... - Page 35 Mira Crescent Spare Parts Diagram 441.46 441.81 441.80 427.32 427.33 441.02 441.03 441.59 427.50 441.57 441.56 441.75 441.89 1598 030 407.26 441.88 441.86 441.82 441.83 441.84 441.87 441.85 For latest prices and delivery to your door visit MyTub Ltd 0845 303 8383 www.mytub.co.uk...
- Page 36 CUSTOMER SERVICE P3659/4 © Kohler Mira Limited, September 2005 For latest prices and delivery to your door visit MyTub Ltd 0845 303 8383 www.mytub.co.uk...