Mira Montpellier Owner's manual

1
Maintenance Guide
Operation &B
Installation
SHOWER CONTROL
THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER

2
INDEX
Page
SAFETY WARNINGS 3
ADVICE 3
INTRODUCTION 4
DESCRIPTION 4
PACK CONTENTS 5
DIMENSIONS 6
SPECIFICATION 7
INSTALLATION REQUIREMENTS 10
INSTALLATION 13
COMMISSIONING 16
OPERATION 19
FAULT DIAGNOSIS 20
MAINTENANCE 22
SPARE PARTS 36
CUSTOMER CARE Back Cover
If you experience any difficulty with the installation or operation of your new
shower control, then please refer to the Fault Diagnosis section, before
contacting Kohler Mira Limited. Our telephone and fax numbers can be found
on the back cover of this guide.

3
SAFETY :WARNINGS
The use of the word ‘failsafe’ to describe the function of a thermostatic mixing valve
is both incorrect and misleading. In keeping with every other mechanism it cannot be
considered as being functionally infallible.
Provided that the thermostatic mixing valve is installed, commissioned, operated
within the specification limits and maintained according to this Manual, the risk of
malfunction, if not eliminated, is considerably reduced.
Malfunction of thermostatic mixing valves is almost always progressive in nature and
will be detected by the use of proper temperature checking and maintenance routines.
Certain types of system can result in the thermostatic mixing valve having excessive
‘dead-legs’ of pipework. Others allow an auxiliary cold water supply to be added to the
mixed water from the mixing valve. Such systems can disguise the onset of
thermostatic mixing valve malfunction.
Ultimately, the user or attendant must exercise due diligence to ensure that the delivery
of warm water is at a stable, safe temperature. This is particularly important in such
healthcare procedures as supervised bathing of patients unable to respond immediately
to unsafe temperatures.
ADVICE
The function of this thermostatic mixing valve is to deliver water consistently at a
safe temperature.This requires that:
1. It is installed, commissioned, operated and maintained in accordance with the
recommendations given in this Manual.
2. Type 3 valves are only used for applications covered by their approved
designations.
3. Periodic attention is given, as necessary, to maintain the product in good functional
order. Recommended guidelines are given in the MAINTENANCE section.
4. Continued use of this product in conditions outside the specification limits given
in this Manual can present potential risk to users.

4
INTRODUCTION
Mira Montpellier Thermostatic showers are specified to meet the highest standards of
safety, comfort and economy as demanded by todays users. All Mira Montpellier
products are designed, manufactured and supported in accordance with accredited BS
EN ISO 9001:1994 Quality Systems.
This Manual covers all Mira Montpellier Thermostatic showers manufactured from
August 2000.
The Mira Montpellier thermostatic shower has been certified for use in UK Healthcare
premises as a Type3 mixing valve under the TMV3 scheme. Where this product is to
be used in such an installation, particular Application, Installation, Commissioning
and Maintenance requirements apply. These are given in the section ‘Type 3 Valves’.
The Mira Montpellier thermostatic mixing valve is approved for the following TMV3
designations:
LP-S, HP-S
DESCRIPTION
The Mira Montpellier thermostatic shower provides accurate temperature control and
flow rates to single installations only.
The Mira Montpellier has two showering options that can be selected via the flow
divertor;
Option 1 - Water is diverted through the fixed head, which is available in a number
of sizes to suit the particuar application.
Option 2 - Water is diverted through the flexible shower fittings.
Note! The Mira Montpellier has not been designed to use both showering options at
the same time.
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.

5
PACK CONTENTS
Tick the appropriate boxes to familiarize yourself with the part names and to confirm
that the parts are included.

Documentation
1 x Installation, Operation and Maintenance Guide 
1 x Customer Support Brochure 
1 x Shower Arm 
5 x Wall Plugs 
1 x Valve 
1 x Variable Shower Head
5 x Fixing Screws 
1 x Fixed Head 
1 x Rigid Riser 
1 x Flow Divertor 
1 x Clamp Bracket 
2 x Support Brackets 
1 x Flexible Hose 
1 x Hexagonal Wrench 

6
All dimensions are nominal and in mm
DIMENSIONS
446 mm
910 mm
1240 mm
193 mm
300 mm Max.
152 mm (6”)
203 mm (8”)
305 mm (12”)

7
SPECIFICATION
Normal Operating Conditions are considered as:
- inlet dynamic pressures nominally balanced to within 10% of each other during
flow.
- a differential of approximately 50oC between the hot and cold inlet temperatures,
and with differentials of 15-35oC between the blend setting and either supply.
- daily usage of 1-6 hours.
- installation and usage environment not subject to extremes of temperature,
unauthorised tampering or wilful abuse.
Disinfectants
In applications where system chemical disinfection is practised, chlorine can be used
(calculated chlorine concentration of 50 mg/l (ppm) maximum in water, per one hour
dwell time, at service interval frequency). 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
For type 3 valves the supply conditions specified in Type 3 Valves-Applications
take precedence over the operating parameters which follow.
Pressures And Flow Rates
For optimum performance, maintained supply pressures should be nominally
equal.
Maximum Pressure Loss Ratio: 10:1
Maximum Static Pressure: 10 bar.
Montpellier Product with 6” Rose
Minimum Maintained Pressure: 0.2 bar (= 2 metre head)
Maximum Maintained Pressure: 5.0 bar
Montpellier Product with 8” Rose
Minimum Maintained Pressure: 0.2 bar (= 2 metre head)
Maximum Maintained Pressure: 5.0 bar

8
Montpellier Product with 12” Rose (not suitable for use with instantaneous
water heaters)
Minimum Maintained Pressure: 0.5 bar (= 5 metre head)
Maximum Maintained Pressure: 5.0 bar
Flow Rates
Flow Rate (l/min)
Pressure Loss (bar)
5
4
3
21 6
5
10
35
40
50
30
25
20
Shower Rose
15 Handset
(with No flow
regulator)
Handset
(with 10 l/min
flow regulator)
The performance specification outlined below is achieved with outlet blend temperature
set between 35 - 45°C and supplies of 15°C cold and 65°C hot with nominally equal
pressures.
- Outlet blend temperature is maintained within 2°C with a 10°C change in
hot or cold supply.
- Thermostatic shut down to seepage within 2 seconds if cold supply
fails. This is achieved only if the hot supply temperature is 10°C above
the set outlet blend temperature.
Temperature Control
Maximum hot water temperature: 85°C (for safety, a recommended hot water storage
temperature maintained below 85°C and for ablutionary installations at between 60 to
65°C).
Optimum temperature control range: 35 - 45°C
Minimum temperature differential between hot and outlet temperature: 10°C

9
Connections
Montpellier: Inlet connectors are 22 mm compression. Outlet connector is 3/4” BSP
Male or 19 mm compression.
Standard connections are: Hot (H) and Cold (C) inlets are clearly marked on the
base of the mixer and must be connected this way.

10
Key to Symbols
Isolating Valve
Mixing Valve
Twin Impeller Pump
Tempering Valve
Pressure Reducing Valve
Single Impeller Pump
Overflow
INSTALLATION REQUIREMENTS
Gravity Fed Shower - The shower MUST be fed from a cold water cistern and
hot water cylinder providing nominally equal pressure.
Mini Expanssion Vessel

11
Unvented Mains Pressure Shower - The shower can be installed with a
unvented, stored hot water cylinder. Only “a competent person” as defined by the
Building Regulations may fit this type of system.
Gas Heated Shower - The shower MUST be installed with a gas water heater or
combination boiler of a fully modulating design. A modulating boiler is one that the
draw off rate is indirectly controlling the gas flow to the boiler, producing a relatively
constant hot water temperature (only suitable for products with 6” and 8” roses).
Cold Hot

12
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 hot water and the shower will compensate for temperature
changes should they occur.
Pumped Shower - 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. Ensure hot
cylinder vent pipe is arranged as shown to enable air separation.
30o- 60o
90o

13
INSTALLATION
General
Installation must be carried out in accordance with these instructions, and must be
conducted by designated, qualified and competent personnel.
1. Before commencing, ensure that the installation conditions comply with the
information given in SPECIFICATION. For Type 3 valves see also Installation
conditions in TYPE 3 VALVES.
2. Care must be taken during installation to prevent any risk of injury or damage.
3. The mixing valve should be positioned for easy access during use and
maintenance. All routine maintenance procedures can be conducted with the
mixing valve body in place.
4. Conveniently situated isolating valves must be provided for maintenance.
5. The use of supply-line or zone strainers will reduce the need to remove debris at
each mixing valve point.The recommended maximum mesh aperture dimension
for such strainers is 0.5 mm.
6. Inlet pressure tappings which allow measurement of the inlet pressures to the
mixing valve under operating conditions are particularly recommended for
healthcare applications with Type 3 valves.
7. Pipework must be rigidly supported.
8. Pipework dead-legs should be kept to a minimum.
9. Supply pipework layout should be arranged to minimise the effect of other outlet
usage upon the dynamic pressures at the mixing valve inlets.
10. Inlet and outlet threaded joint connections should be made with PTFE tape or
liquid sealant. Do not use oil-based, non-setting jointing compounds.
11. To eliminate pipe debris it is essential that supply pipes are thoroughly flushed
through before connection to the mixing valve.
Note! Adequate protection against backflow in a domestic installation is
provided by the integral inlet check valves and the check valve on the divertor
outlet for the variable shower head.

14
4. Locate inlet nuts, plates and olives
flush against the wall. Locate valve on
inlet pipes (the inlet pipes must
protrude a maximum of 18.5 mm from
the finished wall surface) and wall
backplate. Inlet nuts must be tightened
whilst doing this to pull the valve onto
the backplate. Use the hexagon key
(supplied) to tighten grubscrew on the
underside of the mixer.
5. Loosely assemble the shorter piece of
riser piper to the valve body with the
support bracket fitted. Make sure that
the riser pipe is vertical and mark the
position of the fixing hole.
6. Drill and insert wall plug (supplied).
7. Assemble the riser pipe and fix support
bracket to the shower valve.
8. Install the divertor valve onto the riser
pipe.
Note! The divertor valve must be
fitted with its outlet connection on
the left, otherwise restricted flow will
occur.
Installation
1. Decide on a suitable position for the
mixer and the shower rose where all
users can operate it.
Note! longer riser pipe is not available.
2. Remove wall backplate from rear of
mixer by loosening grubscrew with
hexagon key (supplied) on the
underside of mixer.
3. Use backplate to mark 3 hole
positions. Drill wall and insert wall
plugs (supplied).
Wall Backplate
Fixing Screws
Wall Plugs
Wall Bracket
Inlet Pipes
Support Bracket
Fixing Screw
Support Bracket
Divertor Valve

15
9. Install the shower arm with the
clamp bracket and support bracket
fitted into the divertor valve. Make
sure that the riser arm is vertical
and mark the position of the support
bracket.
10. Drill and insert suitable wall plug.
11. Assemble the shower arm to the
divertor valve.
12. Tighten all the connections, taking
care not to damage the plated
surfaces.
13. Install the fixed head in position on
the shower arm making sure that the
‘O’ seal is fitted.
14. Connect the flexible hose to the
divertor valve and to the shower
handset.
15. Place the shower handset in the
clamp bracket.
Shower Arm
Support Bracket
Clamp Bracket
Shower Arm
Fixed Head

16
COMMISSIONING
Thermostatic mixing valves with wax thermostats are inclined to lose their
responsiveness if not used. Valves which have been in storage, installed but not
commissioned, or simply not used for some time should be exercised before setting
the maximum temperature or carrying out any tests.
A simple way to provide this exercise is:
(a) ensure that the hot and cold water are available at the valve inlets, and the
outlet is open.
(b) move the temperature control rapidly from cold to hot and hot back to cold
several times, pausing at each extreme.
Exercising the Thermostat
Maximum Temperature
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 43oC under ideal installation conditions at the
factory.
Site conditions and personal preference may dictate that the maximum temperature
has to be reset following installation. For Type 3 valves in healthcare installations the
maximum blend temperature is determined by the application - see Table under
SPECIFICATION, Application and Designation Information for Type 3 Valves.
Commissioning must be carried out in accordance with these instructions,
and must be conducted by designated, qualified and competent personnel.
Lever Cap
Grub Screw
1. Remove the lever cap and
remove the grubscrew in the top
of the shower control lever with
the with a 2.5mm hexagon key
(supplied).
2. Turn shower lever anticlockwise
to maximum setting. Let the
temperature stabilise.
3. If the temperature measured
needs to be adjusted

17
Commissioning Checks
(Temperatures should always be recorded with a thermometer with proven accuracy).
1. Check inlet pipework temperatures for correct function of checkvalves i.e. that
hot water does not cross flow into the cold water supply and vice versa.
2. Check that the supply pressures are within the range of operating pressures for
the valve.
3. All connections and the mixer body are water tight.
4. Exercise the thermostat.
a) ensure that the hot and cold water are available at the valve inlets, and the
outlet is open.
b) Move the temperature control rapidly from cold to hot and hot back to cold
several times, pausing at each extreme.
5. Adjust the temperature of the mixed water in accordance with the instructions
(refer to Maximum Temperature Setting). For type 3 valves refer to the table
under Application in TYPE 3 VALVES.
6. Operate the outlet flow control and check:
(a) Flow rate is sufficient for purpose.
(b) Temperature(s) obtainable are acceptable.
It is advisable to establish a performance check at this time, which should be
noted for future reference as part of a Planned Maintenance Programme. The
procedure should be chosen to imitate both typical and difficult operating
conditions, such as any supply pressure fluctuations that may be likely. An ideal
method is to locate another outlet on the common cold water supply close to the
mixing valve (operating this outlet should cause a drop in supply pressure), and
note the subsequent effect on blend temperature (should be no more than 2oC
change).
4. Remove the shower control
lever, insert the 2.5mm hexagon
key into the centre of valve
head.
5. Turn the hexagon key
anticlockwise to increase the
temperature, or clockwise to
decrease temperature.
6. Refit shower control lever and
turn off the shower valve.
Warmer
Cooler

18
1. Unscrew the outlet connector.
2. Fit the flow regulator to the outlet
connector. Ensure the regulator is
fitted as illustrated.
3. Ensure the 'O' seal is fitted in place
on the outlet connector.
4. Refit the outlet connector.
Divertor Elbow Outlet Connector
For installations where the force of the spray from the handset is excessive or where
water conservancy is an issue, the 10 litre/minute flow regulator supplied should be
fitted to the outlet connector (divertor elbow).
Direction of
Water Flow
Outlet Connector
Flow Regulator
Divertor Elbow

19
Temperature Selection
The shower valve has one control to set temperature and works in a sequence:
Off 

Cold 

Tepid 

Pre-set Maximum
The Mira Montpellier is fitted with a flow divertor which controls the flow of water to
either the fixed shower head or the flexible shower fitting. It is not designed for both
shower options to be used at the same time.
OPERATION
Flow Divertor
(Moving the lever controls
the flow to the fixed head or
flexible shower fitting)
Shower Valve
(Moving the lever controls
the temperature)

20
Symptom
1. Only hot or cold
water from mixer
outlet.
2. Fluctuating or
reduced flow rate.
3. No flow rate from
mixer outlet.
4. Blend temperature
drift.
5. Maximum blend
temperature setting
too hot or too cold.
Cause/Rectification
a. Inlet supplies reversed (hot supply to cold
supply).
b. No hot or cold water reaching mixer.
c. Check strainers and inlet/outlet fittings for
blockage.
d. Installation conditions continuously
outside operating parameters: refer to
SPECIFICATION, and 2.e. below.
Normal function of the thermostatic control when
operating conditions are unsatisfactory;
a. Check strainers and inlet/outlet fittings for
blockage.
b. Make sure minimum flow rate is sufficient
for supply conditions.
c. Make sure the maintained inlet pressures
are nominally balanced and sufficient.
d. Make sure the inlet temperatures
differentials are sufficient.
e. (Subsequent to rectification of supply
conditions) Check thermostatic
performance; renew Piston Assembly if
necessary.
a. Check strainers and inlet/outlet fittings for
blockage.
b. Hot or cold supply failure.
Indicates operating conditions changed.
a. Refer to symptom 2. above.
b. Hot supply temperature fluctuation.
c. Supply pressures fluctuating.
d. Seal damage or wear. Renew seals.
a. Indicates incorrect maximum temperature
setting; refer to COMMISSIONING
section.
b. As symptom 4. above.
FAULT DIAGNOSIS