Mira 415 Installation And User Manual
PRESSURE BALANCED
Installation and User Guide
SHOWER CONTROL
These instructions are to be left with the user
2
CONTENTS
INTRODUCTION .......................................................................................3
Mira 415 Pressure Balanced Shower Control Range...........................3
Product range .......................................................................................3
WARNING! ........................................................................................... 3
Safety ...................................................................................................3
IMPORTANT SAFETY INFORMATION .................................................... 4
Mira 415 Surface Mounted Shower Control .........................................5
Mira 415B Built-in Shower Control .......................................................6
DIMENSIONS ............................................................................................7
SPECIFICATIONS..................................................................................... 8
415 and 415B ....................................................................................... 8
INSTALLATION REQUIREMENTS ...........................................................9
INSTALLATION .......................................................................................13
Mira 415 Surface Mounted Shower Control .......................................13
Back Inlet Supplies ............................................................................. 17
415B Built-in Shower Control .............................................................20
Solid, Dry-lined, Stud Partition or Dry Partition Wall Structures ......... 22
Shower Cubicle or Laminated Panel .................................................. 28
Reversed Outlet Connection ..............................................................31
Reversed Inlet Supplies ....................................................................32
COMMISSIONING ..................................................................................33
Multi-point Gas Water Heaters ........................................................... 33
Combination Boilers ...........................................................................33
Adjustable Maximum Temperature Stop ............................................34
Temperature Override Button Disable ................................................ 36
OPERATION ...........................................................................................37
How the pressure balancing principle operates .................................38
FAULT DIAGNOSIS ................................................................................39
MAINTENANCE ......................................................................................42
‘O’ Seal Renewal ................................................................................ 44
SPARE PARTS ....................................................................................... 46
ACCESSORIES ...................................................................................... 49
NOTES ....................................................................................................50
CUSTOMER SERVICE ...........................................................................52
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Mira 415 Pressure Balanced Shower Control Range
Description
A range of Mira 1/2" pressure balanced shower controls which automatically adjusts
for variations in inlet pressures to maintain a constant outlet temperature provided
the inlet water temperatures remain stable.
The Mira 415 is not a thermostatic shower control and does not sense supply
temperature variations. Therefore, inlet water temperatures especially the hot, should
be relatively constant.
The Mira 415 is suitable for installation with the following packages:-
– Fully modulating multi-point gas water heaters.
– Fully modulating combination boilers.
– Unvented mains pressure systems.
–
Mains pressurised, instantaneous hot water heated from thermal store,
systems.
– Pumped systems.
Showering temperature is adjusted by the shower control. The ow rate is determined
by the supply pressures available at the inlets, and the output rating of the heater
appliance.
Product range
Mira 415: Surface mounted pressure balanced shower control for connection to
exposed pipework, for high pressure applications (1.0 – 5.0 bar).
White/chrome or white/light golden colour models are available.
Mira 415B: Built-in shower control for connection to concealed pipework, for
high pressure applications (1.0 – 5.0 bar). White/chrome or white/
light golden colour models are available.
WARNING!
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.
Safety
Anyone who may have difculty understanding or operating the controls of any
shower should be attended whilst showering. Particular consideration should be
given to the young, the elderly, the inrm or anyone inexperienced in the correct
operation of the controls.
INTRODUCTION
4
IMPORTANT SAFETY INFORMATION
WARNING!
1.1. 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!
2.1. Read all of these instructions.
2.2. Retain this guide for later use.
2.3. Pass on this guide in the event of change of ownership of the installation
site.
2.4. Follow all warnings, cautions and instructions contained in this guide.
2.5. The plumbing installation must comply with Water Supply Bye-laws, BS 6700,
Building Regulations or any particular regulations and practices, specied
by the local water company or water undertakers. The installation should be
carried out by a plumber or contractor who is registered, or is a member of, an
association such as:
2.5.1. Institute of Plumbing (IOP), throughout the UK, Tel: 01708 472791.
2.5.2. National Association of Plumbing, Heating and Mechanical Services
Contractors (NAPH & MSC), England and Wales, Tel: 01203 470626.
2.5.3. Scottish and Northern Ireland Plumbing Employers’ Federation
(SNIPEF), Scotland and Northern Ireland, Tel: 0131 225 2255.
2.6. Anyone who may have difculty understanding or operating the controls of any
shower should be attended whilst showering. Particular consideration should
be given to the young, the elderly, the inrm, or anyone inexperienced in the
correct operation of the controls.
5
1 x 415 Shower Control
2 x Pipe Concealing Plates
2 x 1/2" BSP Inlet Connector Nipples
2 x Fibre Gaskets
2 x Olives
2 x Compression Nuts
1 x Outlet Nipple
1 x 2.5mm A/F
Hexagon Wrench
2 x 13/4" Fixing Screws
2 x Wallplugs
2 x Concealing Caps
1 x ‘O’ Seal
Tick the appropriate boxes to familiarise yourself with the part names and to
conrm that the parts are included.
Mira 415 Surface Mounted Shower Control
Documentation
1 x Installation, Operation and Maintenance Guide
1 x Customer Support Brochure
PACK CONTENTS CHECKLIST
6
1 x 415 Shower Control with
Building-in Shroud
1 x Concealing Plate,
Circular Mounting Bracket
and Foam Seal
1 x Wall Mounting Bracket
3 x Compression Nuts
3 x Olives
2 x M4 x 30mm Screws
2 x No. 8 x 11/4" Fixing Screws
2 x Wallplugs
2 x M4 x 16mm Screws
1 x 2.5mm
A/F Hexagon
Wrench
1 x Outlet Nipple
1 x ‘O’ Seal
Tick the appropriate boxes to familiarise yourself with the part names and to
conrm that the parts are included.
Mira 415B Built-in Shower Control
Documentation
1 x Installation, Operation and Maintenance Guide
1 x Customer Support Brochure
7
DIMENSIONS
All dimensions are nominal and in millimetres
415B
415
Falling Top Inlet
Supplies
Rising Bottom
Inlet Supplies
Ø153
Ø188.5
Ø56
Back Inlet
Supplies
Ø92
Ø76
Ø35
Ø112
132 A/F
Ø163
57 - 74
35
112
92 A/F
Ø76
8
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
Maximum hot water temperature 85°C
However, BS6700 recommends that the stored temperature of water should never
exceed 65°C. A stored water temperature of 60°C is considered sufcient to meet
all normal requirements and will minimize the deposition of scale in hard water
areas.
Connections
Inlet
15mm Compression or 1/2'' BSP male (415)
15mm Compression (415B)
Outlet
1/2'' BSP male (415)
15mm Compression or 1/2'' BSP male (415B)
SPECIFICATIONS
9
Float operated valve
Isolating valve
Shower control
Warning or overow pipe
Pressure reducing valve
Key to symbols appearing throughout this guide.
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 tted
with some heater appliances the minimum maintained pressure may be above 1 bar,
refer to the section entitled “Commissioning” - “Multi-point gas water heaters”
or “Combination boilers”.
2. The Mira 415 is not suitable for installation as part of a gravity-fed plumbing system.
i.e. in conjunction with a hot water cylinder and cold water storage cistern.
3. When used with a modulating multi-point or combination boiler above 5 bar
maintained pressure, a pressure reducing valve will be necessary.
4. Supply pipes MUST be ushed to clear debris before connecting the shower control
(Byelaw 55).
5. The installation of in-line strainers are recommended to protect the shower control
from the ingress of water borne debris.
6. Conveniently situated isolating valves must be tted for servicing purposes.
7. No form of outlet ow control should be tted, only Kohler Mira recommended
ttings should be used in the outlet pipework.
8. Installations MUST comply with the Local Water Company or Water Undertakers
Byelaws and BS6700
Byelaw 17 – “Shower Hose Connections” requires the handset to be “constrained
by a xed or sliding attachment so that it can only discharge water at a point not
less than 25mm above the spill-over level of the relevant bath, shower tray or other
xed appliance”, refer to Figure 1.
Byelaw 91 - If a product is to be used with a mains fed secondary water heating
device (eg jacketed heater) the system must have a means of accommodating the
expansion of water.
For further information please see “The Mira Shower Guide to the new Model Water
Byelaws”.
If in doubt we recommend that a plumber or contractor who is registered with one
of the following be contacted:-
Institute of Plumbing (I.O.P.) throughout the U.K. Tel: 01708 472791
National Association of Plumbing, Heating and Mechanical Services Contractors
(N.A.P.H. & M.S.C.) England and Wales. Tel: 01203 470626
Scottish and Northern Ireland Plumbing Employers’ Federation (S.N.I.P.E.F)
Scotland and Northern Ireland. Tel: 0131 225 2255
INSTALLATION REQUIREMENTS
10
Figure 2
Figure 1
25 mm minimum
Hose Retaining Ring
The following diagrams and text illustrate typical examples of suitable plumbing
systems for the 415 shower control range:-
9. Gas heated showers
The shower control MUST be installed with a multi-point gas water heater or
combination boiler of a fully modulating design. A fully modulating multi-point
gas water heater or combination boiler is one in which the water draw-off rate
controls indirectly the gas ow rate to the burner. The concept is to produce
relatively constant hot water output temperatures within the operating limits of
the heating appliance. A pressure reducing valve will be required to ensure that
cold water pressures do not exceed 5 bar maintained, refer to Figure 2.
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10. Unvented mains pressure showers
The shower control can be installed with an unvented, stored hot water cylinder.
Only a “competent person” as dened by “Part G” of “Schedule 1” of the “Building
Regulations”, may t this type of system. For packages with no cold water
take off after the appliance pressure reducing valve, it will be necessary to t
an additional pressure reducing valve, set at the same value as the unvented
package in the position shown dotted, when the mains pressure is over 5 bar,
refer to Figure 3. This does not apply to packages with a cold take off after the
pressure reducing valve.
The supply pressures should be between 1 bar and 5 bar to the Mira 415.
Safety devices have not been shown whithin
dotted line area for clarity of illustration
Figure 3
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11. Mains pressurised instantaneous hot water, heated from thermal store,
showers
Packages of this type, tted with a tempering valve can be used with the
Mira 415. The tempering valve provides a relatively constant hot water
temperature and the 415 pressure balancing valve compensates for system
pressure variations. The Mira 415 supply pressure range is 1 bar to 5 bar.
For pressures above 5 bar a pressure reducing valve will be required, refer to
Figure 4.
Figure 4
13
Mira 415 Surface Mounted Shower Control
Rising or Falling Inlet Supplies
1.1 Determine whether the hot or cold water services will be connected to the shower
control from the top (falling) or from the bottom (rising). Before deciding the
nal positioning of the shower control, please bear in mind the following:-
1.2 Consideration should be given to the requirements of Byelaw 17 with regard to
positioning of the shower control and selected shower ttings. (Not applicable
to rigid shower ttings).
1.3 Determine the position of the outlet in relation to the type of shower tting
used.
e.g. Mira er-s: Select top outlet.
Mira ev-s: Select bottom outlet.
Rising Supplies
Falling Supplies
The Mira 415 is supplied with inlet connections hot left, cold right and bottom
outlet as standard. To change the position of the outlet refer to the section,
“Reversed Outlet Connection”: instructions 1 to 8 inclusive.
Hot Inlet Port
Bottom Outlet
INSTALLATION
14
1.4 Remove the backplate by releasing, anti-clockwise, the two recessed grub
screws which retain the backplate against the brass shower control body, using
the 2.5mm A/F hexagon wrench (supplied).
1.6 Drill and suitably plug the two marked xing holes. Secure the backplate to the
wall with the two No. 8 x 13/
4
"
xing screws and wallplugs provided, if suitable,
ensuring that screw head seats into guide ribs.
Note! Screws with larger heads will foul the shower control body.
Guide Ribs
1.7 Thoroughly flush the incoming hot and cold water supplies before final
connection of the shower control (Byelaw 55).
1.5 Mark the nal position on the nished wall surface using the backplate as a
template.
Mark through the backplate the position of the two holes ensuring that they are
vertically aligned.
Backplate
Grub Screw
15
1.9 Release, anti-clockwise, the two grub screws that retain the inlet elbows, using
the 2.5mm A/F hexagon wrench (supplied). Ensure that the ‘O’ seal is correctly
located on the smaller diameter shoulder of the brass inlet connector, and not
in the ‘V’ groove.
1.10 Ret the elbows in the required position, i.e. rising or falling supplies, ensuring
that the grub screws locate into the grub screw socket.
Tighten, clockwise, the grub screws and t the two concealing caps into the
hexagon recesses.
Concealing Cap
Rising supplies Falling supplies
1.8 Locate the shower control body onto the backplate and secure by tightening,
clockwise, the two recessed grub screws, using the 2.5mm A/F hexagon wrench
(supplied).
Grub Screw
Backplate
Shower Control Body
Grub Screw Groove
'O' Seal
Inlet Elbow
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1.11.6 Finally, carefully tighten, clockwise, the compression nut using, if
necessary, a cloth to protect the plated surfaces.
1.11.2 Screw in, clockwise, the 1/2" BSP connector nipple ensuring that the
compression taper faces uppermost, using a 12mm A/F hexagon wrench
(not supplied).
1.11.3 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.
1.11.4 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.
Connector Nipple
Fibre Gasket
1.11 Assemble the components of the inlet connector compression ttings in the
following sequence for each inlet:-
1.11.1 Place the bre gasket against the shoulder of the 1/2" BSP inlet connector
nipple.
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