PRESSURE BALANCED SHOWER CONTROL Installation and User Guide THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER
Contents Section 1 ....... Introduction Page ................................................................... 3 2 ....... Important Safety Information ........................................... 4 3 ....... Pack Contents Checklist .................................................. 5 4 ....... Dimensions ................................................................... 7 5 ....... Specifications ................................................................... 8 6 .......
Section 1 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 CombiForce 415 is a pressure balanced shower control which maintains a constant outlet temperature irrespective of changes in inlet pressures as long as the inlet water temperatures remain the same.
Section Important Safety Information Important Safety Information 1Section 2 Warning! 1. Products manufactured by us are safe and without risk provided they are installed, used and maintained in good working order in accordance with our instructions and recommendations. Caution! 1. Read all of these instructions. 2. Retain this guide for later use. 3. Pass on this guide in the event of change of ownership of the installation site. 4.
Section Pack Contents Checklist 3 ✔ Tick the appropriate boxes to familiarise yourself with the part names and to confirm ❏ that the parts are included. 1. Mira CombiForce 415 Surface Mounted Shower Control 1 x CombiForce 415 Shower Control 2 x 1/2" BSP Inlet Connector Nipples 2 x Compression Nuts 2 x 13/4" Fixing Screws ❏ ❏ ❏ ❏ 2 x Fibre Gaskets 2 x Pipe Concealing Plates ❏ 1 x Outlet Nipple ❏ 2 x Wallplugs ❏ 2 x Olives ❏ ❏ 1 x 2.
2. Mira CombiForce 415B Built-in Shower Control 1 x Wall Mounting Bracket 1 x CombiForce 415 Shower Control with Building-in Shroud ❏ 1 x Control Knob Cap ❏ 1 x Concealing Plate, Circular Mounting Bracket and Foam Seal ❏ ❏ 1 x Outlet Nipple 3 x Compression Nuts ❏ ❏ 2 x M4 x 16 mm Screws 2 x No. 8 x 11/4" Fixing Screws 2 x Wallplugs 3 x Olives ❏ 1 x 2.5 mm A/F Hexagon Wrench ❏ 3.
Section Dimensions 4 Top Inlet (Falling) Supplies Back Inlet Supplies Ø56 Ø92 35 153 Bottom Inlet (Rising) Supplies 188.
Section 5 SPECIFICATIONS Specifications Mira CombiForce 415 and 415B Pressure Range Minimum maintained pressure: 1 bar. Maximum maintained pressure: 5 bar. Maximum static pressure: 10 bar. Note! For optimum performance, the initial supply pressures should be nominally equal. Temperatures Hot and cold water supply temperatures MUST remain relatively constant. Maximum hot water temperature: 85°C. Ideally the hot water temperature should never exceed 65°C.
Section 6 Installation Requirements 1. Layout and sizing of pipework must be such that when other services are used, pressures at the shower control inlets do not fall below the recommended minimum (1 bar). The pressure balancing performance is impaired below 1 bar. When fitted with some heater appliances the minimum maintained pressure may be above 1 bar, refer to the section Commissioning: “Multipoint gas water heaters” or “Combination boilers”. 2.
Typical Suitable Installations 1. Instantaneous multipoint water heaters and combination boilers The shower MUST be installed with a multipoint gas water heater or combination boiler of a fully modulating design (i.e. where the water draw-off rate indirectly controls the gas flow rate to the burner). An expansion vessel MUST be fitted (and regularly maintained) if any form of backflow prevention device is fitted, e.g. non-return valve, PRV.
2. Unvented mains pressure showers 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. For packages with no cold water take off after the appliance reducing valve, it will be necessary to fit an additional drop tight pressure reducing valve when the mains pressure is over 5 bar.
3. Mains pressurised instantaneous hot water shower, heated from a thermal store Packages of this type, fitted with a tempering valve can be used. A drop tight pressure reducing valve MUST be fitted if the supply pressures exceed 5 bar maintained. An expansion vessel MUST be fitted (and regularly maintained) if any form of backflow prevention device is fitted, e.g. non-return valve, PRV. This will ensure that excess expansion or pulse pressures do not damage the product or the plumbing system.
Measuring System Pressures 1. General It is important that the system pressures are within the range specified for the Mira CombiForce 415 (refer to the Specifications section). If the system pressure is not known then the system pressure MUST be measured as explained in this section. Pressures are those present at the inlet to the appliance either whilst running (maintained) or in the off state (static).
Section 7 Installation Mira CombiForce 415 Surface Mounted Shower Control Rising or Falling Inlet Supplies Note! The Mira CombiForce 415 is supplied with inlet connections hot left, cold right and bottom outlet as standard. For installations with reversed hot and cold supplies complete the installation and refer to the section Installation: "Reversed Inlet Supplies". 1.
2. Remove the backplate by releasing, anticlockwise, the two recessed grub screws which retain the backplate against the brass shower control body, using the 2.5 mm A/F hexagon wrench (supplied). Backplate Grub Screws 3. Mark the final position of the shower control on the finished wall surface using the backplate as a template. Mark the position of the two holes on the backplate. Ensure the holes are vertically aligned. WARNING! Ensure there are no buried cables or pipes in the wall before drilling. 4.
Backplate 7. Fit the shower control body onto the backplate and secure by tightening, clockwise, the two recessed grub screws, using the 2.5 mm A/F hexagon wrench (supplied). Grub Screws Shower Control Body 8. Refit the elbows in the required position, i.e. rising or falling supplies. Ensure the grub screws locate into the 'V' groove and tighten the grub screws. Rising Supplies Falling Supplies 9.
Compression Nut Olive 9.3. Slide, in turn, the compression nut, then the olive, over the hot and cold inlet pipework. If necessary, sparingly, smear ‘liquid jointing’ on the pipe end and the outside of the olive. 9.4. Insert the hot and cold inlet pipework into the opening of the 1 2 / " BSP inlet connector nipple then slide the olive and compression nut into place. 9.5. Finally, carefully tighten, clockwise, the compression nut. If necessary use a cloth to protect the plated surfaces. 10.
Back Inlet Supplies 1. Follow the shower control installation procedure as for “Rising or Falling Inlet Supplies”: instructions 1. to 4. inclusive. 2. Using a spirit level, mark the route of incoming hot and cold water supply pipes at a distance of 153 mm centres. 3. Remove the plaster and brickwork to the required depth to conceal the supply pipework. 153 mm Note! Depth must be sufficient to prevent pipe concealing plates fouling on the plumbing elbows. 4.
1 2 " / Male BSP 15 mm Compression Connector Nipple Fibre Gasket 6. Fit the gaskets to the 1/2" BSP connector nipples and screw in the nipples with the tapered ends outermost to accept the compression fittings. Tighten the 1/2" BSP connector nipples fully with a 12 mm A/F hexagon wrench (not supplied). 7. Thoroughly flush the incoming hot and cold water supply pipes before connecting the shower control. Failure to do so may result in product malfunction. Fibre Gasket 8.
Mira CombiForce 415B Built-in Shower Control The built-in shower control incorporates an integral wall mounting bracket assembly which can be used to install the shower into a solid, dry-lined, stud partition or dry partition wall structure, shower cubicle or laminated panel. Installers may wish to consider other options such as fabricating rear supports using wooden noggins, however, these methods of fixing are beyond the scope of this guide.
Solid, Dry-lined, Stud Partition or Dry Partition Wall Structures 1. Before you decide on the final position of your shower control, please bear in mind the following : - Decide on a suitable position for the shower control. The position of the shower control and the shower fittings must provide a minimum gap of 25 mm between the spill-over level of the shower tray/bath and the handset. This is to prevent backsiphonage.
5. Mark the wall surface for an opening measuring approximately 245 mm x 125 mm. Mark the route of the incoming and outgoing pipework services. Using the building-in shroud as a guide remove the plaster and brickwork/drylining to the required depth of concealment. Note! The depth of concealment must be such that the final wall surface (e.g. plaster and tiles etc.) finishes on the raised portion of the plastic building-in shroud. 125 mm 245 mm 6.
11. Connect the incoming hot and cold water supply pipes : 11.1 Slide the compression nut, then the olive, over the pipe end. If necessary, sparingly smear liquid jointing on the pipe end and the outside of the olive. 11.2 Insert the pipe end into the opening of the inlet connector then slide the olive and compression nut into place. 11.3 Finally, carefully tighten, clockwise, the compression nuts. Outlet Nipple 'O' Seal 12. Connect the outlet pipe : 12.1 Place the ‘O’ seal on to the nipple, as shown.
14. Plaster and tile up to the tapered sides of the plastic building-in shroud and, when set remove the shroud. The two M5 shroud retaining screws should be screwed temporarily into the base of the shower control for use later. Control Knob Control Knob Cap 15. Push the control knob cap on to the shower control knob. 16. Fit the foam seal over the reverse side of the circular mounting bracket. 17.
Shower Cubicle or Laminated Panel The built-in shower control incorporates an integral wall mounting bracket assembly which can be used to install the shower into the front or back face of a shower cubicle or laminated panel.
Installation on to the Back Face of a Shower Cubicle or Laminated Panel The building-in depth for the integral wall mounting bracket assembly is 58 mm. The integral wall mounting bracket assembly can be used to install the shower control into a shower cubicle or laminated panel of between 4 and 21 mm. The building-in depth calculation must include the final thickness of plaster and tiles. 1.
Reversed Outlet Connection Mira CombiForce 415 shower controls are supplied with inlet connections hot left, cold right and bottom outlet. The Mira CombiForce 415B is supplied with inlet connections hot left, cold right and top outlet as standard. To reverse the outlet position: 1. Rotate the shower control body through 180o and install the shower control. 2. Prise off the concealing cap, unscrew the control knob retaining screw and remove the temperature override stop and control knob. 3.
Reversed Inlet Supplies Mira CombiForce 415 shower controls are supplied with inlet connections hot left, cold right and bottom outlet. The Mira CombiForce 415B is supplied with inlet connections hot left, cold right and top outlet as standard. Both shower controls are fitted with a single sequential control knob. The shower control is turned off by turning the control knob fully clockwise. The correct sequence of operation is anticlockwise movement of the control knob followed by: Cold Warm Hot water.
Section 8 Commissioning All heater appliances must have a fully modulating heat output for the domestic hot water, to provide a constant temperature of hot water to the Mira CombiForce 415 shower control. Multipoint Gas Water Heaters These notes are based on a heater with an effective output power of 23.5 kW. Heaters with higher or lower effective output powers will proportionally affect the following information. The Mira CombiForce 415 range does not compensate for water temperature changes. 1.
5. The maintained water supply pressure should not exceed 5 bar. A pressure reducing valve will be needed for pressures over 5 bar to improve the system operation. It should be installed to reduce both the cold feed pressure to the heater appliance and the cold feed pressure to the Mira CombiForce 415 to approximately 3.5 bar. Additional benefits may be obtained by fitting the water pressure reducing valve after the premises internal stop valve, drain valve and if fitted, outside tap.
To decrease the temperature, reposition the stop one serration clockwise. Repeat the check as necessary. Control Knob Control Knob Retaining Screw Temperature Override Button Adjustable Temperature Stop Adjustable Temperature Stop Plastic Override Stop Concealing Cap Indentations 8. Refit the control knob (with the override button at the bottom), control knob retaining screw/plastic override stop and concealing cap.Please ensure the plastic override stop is correctly seated.
Temperature Override Button Disable The Mira CombiForce 415 incorporates a safety feature which prevents the temperature override button from being depressed, enabling the user to access a higher shower temperature. The shower control is despatched from the factory with the button in the “enabled” position. The following sequence will allow the installer to “disable” the temperature override button if required. 1. Ensure the shower control is turned off. Remove the concealing cap. 2.
Section Operation 9 Mira CombiForce 415 shower has a single control knob which turns the shower control on/off and adjusts the water temperature. Turn the control knob anticlockwise to start the flow of water and clockwise to stop. To increase the showering temperature turn the control anticlockwise and clockwise to decrease the water temperature.
How the pressure balancing principle operates Mira CombiForce 415 pressure balanced shower controls automatically adjust for variations in inlet pressures. This will maintain a constant outlet temperature provided the inlet water temperatures remain stable. The Mira CombiForce 415 is not a thermostatic shower control and does not sense supply temperature variations. Therefore, inlet water temperatures especially the hot, must remain relatively constant.
Section 10 Fault Diagnosis Customer Fault Diagnosis The trouble shooting information tabled below gives details on what you can do as a user should you encounter difficulties whilst operating the shower. Note! Should these remedies prove to be unsuccessful in solving your problem, contact your installer for further advice. Key for applicability column A - Instantaneous gas heated showers. B - Unvented mains pressure showers.
Malfunction Shower pattern collapses when another hot tap is turned on. Cause Remedy (a) The heater is not capable of supplying several outlets at the same time. (b) Inlet strainer blocked. Reduce the simultaneous demand. (a) Property water supply pipe partially blocked or undersized. (b) Property stop or servicing valve not fully open. (c) Insufficient mains cold water pressure. Contact the local water supplier or your installer. Open valve. (d) Inlet strainer blocked.
Malfunction Cause Remedy Shower force too strong. High pressure supplies. Fit 9 l/m flow regulator. No hot water available (a) Heater appliance not igniting due to insufficient mains pressure. Contact the local water supplier or a CORGI registered installer. (b) Heater appliance not igniting due to appliance fault. Contact a CORGI registered installer. (c) Product hot or cold isolating valve not fully open. Open valve. (d) Hot water run out. Wait until reheated. (e) Inlet strainer blocked.
Installer Fault Diagnosis: refer to appliance diagram and customer fault diagnosis Read the section “Important Safety Information” first. Providing the shower has been correctly installed and is operated in accordance with the instructions contained in this guide, difficulties should not arise. If any maintenance is required then it must be carried out by a competent tradesperson for whom the fault diagnosis chart and maintenance instructions are provided.
Malfunction Shower pattern collapses when another hot tap is turned on. Shower pattern collapses when another cold tap is turned on. Cause Remedy (a) The heater is not capable of supplying several outlets at the same time. (b) Inlet strainer blocked. Reduce the simultaneous demand. (a) Property water supply pipe partially blocked or undersized. (b) Property stop or servicing valve not fully open. (c) Insufficient mains cold water pressure.
Malfunction Cause Remedy Shower force too strong. High pressure supplies. Fit 9 l/m flow regulator. No hot water available (a) Heater appliance not igniting due to insufficient mains pressure. Contact the local water supplier or increase supply pipe size to premises. (b) Heater appliance not igniting due to appliance fault. Refer to heater appliance instructions. (c) Product hot or cold isolating valve not fully open. Open valve. (d) Hot water run out. Wait until reheated.
Section 11 Maintenance Mira products are precision engineered to provide satisfactory performance provided they are installed and operated in accordance with the recommendations contained in this guide. The shower control is designed for the minimum of maintenance in normal domestic use. If a malfunction occurs then this will probably necessitate a complete cartridge replacement. Important! The cartridge contains no internally serviceable parts. When installed in very hard water areas (above 200 p.p.m.
Plastic Pins 'O' Seal Retaining Bush 'O' Seal Cover Retaining Screws Cartridge 'O' Seal Hub Cover 'O' Seal Cover Shroud Retaining Screws Skid Washer Plastic Override Stop Cover Adjustable Temperature Stop Cover Shroud Control Knob Retaining Screw Figure 1 Concealing Cap 5. Pull the pressure balancing cartridge from the shower control body. 6. Identify which is the hot inlet of the shower control and fit the new cartridge accordingly.
Arrow H C Flat On Spindle End View Of Cartridge Figure 2 12. Refit the adjustable temperature stop in its original position. 13. Temporarily fit the control knob (with the override button at the bottom). Rotate the control knob anticlockwise until the desired temperature is achieved. Note the final position of the override button, e.g. 11 O’ clock. Rotate the control knob to the “off” position. 14.
‘O’ Seal/Inlet Strainer Renewal Should the ‘O’ seals require renewing then follow the procedure below: Important! Use only silicone based lubricants when reassembling. 1. Follow the procedure detailed in “Cartridge Renewal”: instructions 1. to 5. to dismantle the shower control. 2. Check the ‘O’ seals on the cartridge hot and cold inlets for any signs of damage and renew if necessary. 3. Remove the inlet strainers and check for damage, renew if necessary.
Inlet Strainer Cleaning Should the inlet strainer units require cleaning or renewal then follow the procedure below: Important! Use only silicone based lubricants when reassembling. 1. Follow the procedure detailed in “Cartridge Renewal”: instructions 1. to 5. to dismantle the shower control. 2. Pull the inlet strainer units from the valve body. 3. Clean the complete strainer unit under running water. Check for damage and renew the whole unit if necessary. 4. Refit the strainer units.
Section Spare Parts 12 CombiForce 415 Spare Parts List 012.12 Cover 242.55 Adjustable Temperature Stop 280.07 Inlet Compression Fitting - chrome 280.15 Inlet Compression Fitting - light golden 553.35 Outlet Nipple Assy - chrome 553.54 Outlet Nipple Assy - light golden 575.12 2.5mm Hexagon Wrench 617.18 CombiForce 415 Body (including strainers) 617.20 Shroud Pack CombiForce 415 - white 617.21 Shroud Pack CombiForce 415 - chrome 617.22 Control Knob Assembly CombiForce 415 - white 617.
CombiForce 415 Spare Parts Diagram 617.20 617.21 617.29 280.07 280.15 802.27 802.33 617.20 617.21 617.29 A A 012.12 A 575.12 617.18 A A A A 242.55 902.55 A 553.35 553.54 617.22 617.23 932.
CombiForce 415B Spare Parts List 012.12 Cover 119.85 Wall Mounting Bracket 242.55 Adjustable Temperature Stop 410.53 Concealing Plate - white 410.54 Concealing Plate - chrome 410.55 Concealing Plate - light golden 555.67 Outlet Nipple 575.12 2.5mm Hexagon Wrench 617.19 CombiForce 415B Body (including strainers) 617.22 Control Knob Assembly - white 617.23 Control Knob Assembly - chrome 807.28 Backplate Assembly - components identified 'B' 902.55 Cartridge Assembly 932.
CombiForce 415B Spare Parts Diagram 119.85 B B 555.67 617.19 932.04 A C A A A B 012.12 A 575.12 A 242.55 902.55 932.25 A A A C 617.22 617.23 410.53 410.54 410.
Section 13 Accessories DCV-H: An outlet double check valve, requiring a minimum inlet supply pressure of 0.5 bar, which has been designed to prevent the backflow or backsiphonage of potentially contaminated water, through shower controls which are fitted with a flexible hose as part of the outlet shower fitting. Available as an optional accessory from your Mira stockist. DCV-H Outlet double check valve 9 litre/min Outlet Flow Regulator (Part No. 146.
Appendix Notes 51
Section Customer Service Guarantee of Quality After Sales Service Mira Showers guarantee products against any defect of materials or workmanship for one year from the date of purchase (2 years for Mira Select and 3 years for Mira Excel ranges). Our Customer Services Team is comprehensively trained to provide every assistance you may need: help and advice, spare parts or a service visit. To validate the guarantee, please return your completed registration card.
