Kohler Discovery User manual

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These instructions are to be left with the user
Installation and User Guide
SHOWER VALVE
BUILT IN DUAL CONTROL

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CONTENTS
Introduction ............................................................................................. 3
Safety : Warnings .................................................................................... 3
Pack Contents ......................................................................................... 4
Dimensions ............................................................................................. 5
Specifications .......................................................................................... 6
Pressures ............................................................................................ 6
Temperatures ....................................................................................... 6
Flow Rates ........................................................................................... 6
Connections ......................................................................................... 7
Installation Requirements ...................................................................... 8
Installation ............................................................................................. 10
General .............................................................................................. 10
Installation Methods ........................................................................... 11
1. Solid Wall or Stud Partition
(Using Securing Brackets - Mounting off Front Face) ................. 12
2. Solid Wall or Stud Partition
(Using Rear Fixing Points on Shower Control) ............................ 15
3. Laminated Panel
(Using Securing Brackets - Mounting off Rear Face) .................. 17
Control Assembly .............................................................................. 19
Reversed Supplies ............................................................................. 21
Commissioning ..................................................................................... 22
Maximum Temperature Setting .......................................................... 22
Operation ............................................................................................... 23
Fault Diagnosis ..................................................................................... 24
Maintenance .......................................................................................... 25
General .............................................................................................. 25
Lubricants .......................................................................................... 25
Cleaning ............................................................................................. 25
Filters ................................................................................................ 25
Spare Parts ............................................................................................ 26
Customer Service .................................................................... Back Page

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This Discovery Thermostatic Shower Control is precision engineered and should give
continued safe and controlled performance, provided:
1. It is installed, commissioned, operated and maintained in accordance with
manufacturers recommendations.
2. Periodic attention is given, when necessary, to maintain the product in good
functional order.
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.
The Mira Discovery Built in Dual Control Shower Valve is a thermostatic shower control
with independent selection for temperature and spray force and is suitable for
connection to concealed pipework.
INTRODUCTION
SAFETY : WARNINGS
If you experience any difficulty with the installation or operation of your new shower
control, then please refer to "Fault Diagnosis", before contacting Kohler Mira Limited.
Our telephone and fax numbers can be found on the back cover of this guide.

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1 x Control Assembly
Tick the appropriate boxes to familiarize yourself with the Discovery Thermostatic
Shower Control part names and to confirm that the parts are included.

PACK CONTENTS
1 x Shower Valve fitted to the Building-in Shroud
3 x Compression Nuts
3 x Olives
  x Flow
Regulator
(12 litres per minute)
1 x Hexagon Key
3 x Mounting Brackets
1 x O-Key
3 x Wall Plugs
3 x Securing Screws
2 x M5 x 40 Screws
3 x M5 x 8 Screws
1 x Customer Support Card
1 x Hose Washer

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DIMENSIONS
Note! All Dimensions are Nominal
Pipe Centres
186 mm
47 mm 64 - 82 mm
108 mm
231 mm
27 mm

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SPECIFICATIONS
Pressures
Maximum Static Pressure: 10 Bar.
Minimum Maintained Pressure (Gas Water Heater): 1.0 Bar.
(for optimum performance initial supplies should be nominally equal).
Minimum Maintained Pressure (Gravity System): 0.1 Bar.
(0.1 bar = 1 Metre head from base of cold tank to the outlet of the shower handset).
Maximum Maintained Pressure: 5 Bar.
Temperatures
Factory Pre-set (Blend) Shower: 43°C.
Optimum Thermostatic Control Range: 35°C - 45°C.
(Achieved with supplies of 15°C cold, 65°C hot and nominally equal pressures).
Max. Hot Supply: 85°C.
Recommended Hot Supply: 60°C - 65°C.
Min. Differential between Hot Supply and Outlet Temperature: 10°C.
Cold Water Range: 1°C - 20°C.
Flow Rates
Typical Flow Rates - Mira Discovery Dual Control with Adjustable Fittings:
Start (Outer Spray)
Soothe (Middle Spray)
Force (Inner Spray)
Rigid (Fixed Spray)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
0
2
4
6
8
10
12
14
16
18
Supply Pressure (Bar)
Flow Rate (L/Min)
With 12 L/Min Flow
Regulator Fitted

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Connections
Standard connections are: Hot-Left, Cold-Right, Top-Outlet, if reversed inlets are
required refer to sections: ‘Installation’ and ‘Reversed Supplies’.
Inlets: 15 mm Compression.
Outlet: 15 mm Compression.
Thermostatic Shut-down
Thermostat will shut off Hot Supply Within 2 Seconds if Cold Supply Fails.
(Achieved only if the hot supply temperature is greater than 10°C above the set blend
temperature).

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Flow Regulator Recommended
INSTALLATION REQUIREMENTS
Isolating valve
Mixing Valve
Twin Impeller Pump
Tempering Valve
Pressure Reducing Valve
Single Impeller Pump
Overflow Indicator
Mini Expansion Vessel
Gas heated system
The shower MUST be installed with a
gas water heater or combination boiler
of a fully modulating design.
Note! Flow regulator recommended to be
installed, refer to the ‘Discovery Fittings
Installation and User Guide’. However,
it is possible following installation of a
flow regulator that the flow rate is reduced
too much for the boiler to ignite. If this is
the case remove the flow regulator.
Gravity fed system
The shower MUST be fed from a cold
water cistern and hot water cylinder
providing nominally equal pressure.
Note! The Shower Control is compatible with the following installations.
Key to symbols

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Flow Regulator Recommended
Flow Regulator Recommended
Unvented mains pressure system
The shower can be installed with a
unvented, stored hot water cylinder.
Pumped system
The shower can be installed with an inlet
pump (twin impeller). The pump must be
installed on the floor next to the hot water
cylinder.
Note! Flow regulator recommended to be
installed, refer to the ‘Discovery Fittings
Installation Manual’.
Mains pressurised instantaneous
hot water system (thermal store)
The shower can be installed with
systems of this type with balanced
pressures.
Note! Flow regulator recommended to be
installed, refer to the ‘Discovery Fittings
Installation Manual’.
Air Separation
90°
30°-60°
Flow Regulator Recommended

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INSTALLATION
General
Installation must be carried out in accordance with these instructions, and must be
conducted by designated, qualified and competent personnel.
The installation must comply with the “Water Supply Regulations 1999 (Water Fittings)”
or any particular regulations and practices, specified by the local water company or
water undertakers.
Note! Make sure that all site requirements correspond to the information given in the
section: ‘Specifications’.
Caution! The shower must not be installed in an area where it may freeze.
For stud partitions alternative fixings may be required.
1. Isolating valves must be installed close to the valve for ease of maintenance.
2. Pipework must be rigidly supported and avoid any strain on the connections.
3. Pipework dead-legs should be kept to a minimum.
4. Supply pipework layout should be arranged to minimise the effect of other outlet
usage upon the dynamic pressures at the valve inlets.
5. Inlet and outlet threaded joint connections should be made with PTFE tape or
liquid sealant. Do not use oil-based, non-setting joint compounds.
6. To eliminate pipe debris it is essential that supply pipes are thoroughly flushed
through before final connection.
7. 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 temperature and flow knobs of the shower
control.
8. 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 back-siphonage. For
further information on the installation
of your shower fittings, refer to the
Discovery Fittings Installation and User
Guide.
Note! Only use shower fittings
recommended by the manufacturer or
supplier.
Hose Retaining Ring
25 mm Minimum
Spill-over Level