Mira Discovery User guide

Mira discovery And diverter
thermostatic mixer Shower
Installation and User Guide
These instructions are to be left with the user
1
Contents
Introduction
Patents and Design Registration
Introduction
2
Safety Warnings
3
Pack Contents
4
Specifications
5
Pressures
5
Temperatures
5
Thermostatic Shut-down
5
Connections
5
Flow Rates
5
Installation Methods
The Mira Discovery and Diverter Thermostatic
Mixer is a Thermostatic Shower Control that is
suitable for connection to concealed pipework.
It has independent selection for temperature
and an on/off flow control diverts between two
seperate outlets.
The thermostatic mixer incorporates a wax
capsule temperature sensing unit, which provides
an almost immediate response to changes in
pressures or temperature of the incoming water
supplies to maintain the selected temperature. An
adjustable maximum temperature stop is provided
which limits the temperature to a safe level.
Inlet filters are fitted to protect the thermostatic
cartridge.
6
Rear Fixing
6
Behind Panel Fixing
6
Front Face Fixing
6
Installation 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.
3
7
Suitable Plumbing Systems
7
General
7
Solid Wall or Stud Partition Fixing Using
Rear Mountings
8
The Mira Discovery and Diverter has been
certified as a Type 2 valve under the BUILDCERT
TMV2 scheme. It also complies with the Water
Supply (water fittings) Regulations 1999.
Panel Fixing using Securing Brackets Mounting off Rear Face
10
Solid Wall or Stud Partition Fixing using
Securing Brackets
12
Control Assembly
Reversed Inlet Supplies
15
Operation
15
Flow Regulation
Commissioning
Maximum Temperature Setting
Override Stop Setting
Guarantee
14
For domestic installations, Mira Showers
guarantee the Mira Discovery and Diverter
against any defect in materials or workmanship
for a period of three years from the date of
purchase.
For non-domestic installations, Mira Showers
guarantee the Mira Discovery and Diverter against
any defect in materials or workmanship for a
period of one year from the date of purchase.
15
16
16
16
Type 2 Valves
17
Fault Diagnosis
18
Fault Diagnosis
18
Maintenance
19
Spare Parts
22
Accessories
23
Customer Services
24
For terms and conditions refer to the back cover
of this guide.
Recommended Usage
Application
If you experience any difficulty with the
installation or operation of your new
thermostatic mixer, please refer to ‘Fault
Diagnosis’, before contacting Mira Showers.
Our contact details can be found on the back
cover of this guide.
2
Domestic
ü
Light Commercial
ü
Heavy Commercial
û
Healthcare
û
Patents and Design Registration
8.The water supplies to this product must be
isolated if the product is not to be used for a
long period of time. If the product or pipework
is at risk of freezing during this period they
should also be drained of water.
9. Anyone who may have difficulty understanding
or operating the controls of any shower should
be attended whilst showering. Particular
consideration should be given to the young,
the elderly, the infirm or anyone inexperienced
in the correct operation of the controls.
10.This appliance is not intended for use by
persons (including children) with reduced
physical, sensory or mental capabilities, or
lack of experience and knowledge, unless
they have been given supervision or instruction
concerning the use of the appliance by a
person responsible for their safety
11.If the shower is dismantled during installation
or servicing then upon completion the product
must be inspected to ensure there are no
leaks
12.Rapid/Excessive movement of the flow and/
or temperature control levers may result in
momentary unstable blend temperatures.
13.Care is required when adjusting flow or
temperature, make sure that the temperature
has stabilised.
14.When this product has reached the end of its
serviceable life, it should be disposed of in a
safe manner, in accordance with current local
authority recycling, or waste disposal policy.
Patents:
GB: 2 291 693, 2 422 886
Euro: 1 672 257 DE, FR, GB, IT, NL, SE
Germany: 60 2005 002 339.9
Patent Applications:
US: 2006-0124758-A1
Euro: 07015846.4
Safety Warnings
General
Mira thermostatic mixers are precision engineered
and should give continued safe and controlled
performance, provided:
1.They are installed, commissioned, operated
and maintained in accordance with the
manufacturer’s recommendations.
2.Type 2 Valves are only used for applications
covered by their approved designations, refer
to section: ‘Type 2 Valves’.
3. Periodic attention is given, when necessary,
to maintain the product in good functional
order.
Warning!
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. Follow all warnings, cautions and instructions
contained in this guide.
5.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.
6. If you experience any difficulty with the
installation or operation of your new shower,
then please refer to ‘Fault Diagnosis’, before
contacting Mira Showers. Our contact details
can be found on the back cover of this guide
7.DO NOT operate this appliance if it is frozen.
Allow the appliance to thaw before using. The
shower unit must not be fitted where it may be
exposed to freezing conditions.
3
Pack Contents
Tick the appropriate boxes to familiarise yourself
with the part names and to confirm that all of the
parts are included.
q 1 x Concealing Plate and Control Assembly
q 1 x Thermostatic Mixing Valve
(attached to the building in shroud)
q 4 x Compression Nuts
q 4 x Olives
q 3 x Wall Plugs
q 3 x Fixing Screws
q 1 x 3 mm Hexagonal Key
q 1 x Right Angled Connector (RAC)
q 3 x M5 x 40 mm Screws
Documentation
q 1 x Guarantee Registration Document
q 2 x Flow Regulators
q 3 x Mounting Brackets
q 3 x M5 x 8 mm Screws
q 1 x Temperature Drive Extender
4
Flow Rates
Specifications
Typical flow rates on high pressure systems (1 to
5 Bar), mixer valve and divertor only with open
outlet and 12 L/Min flow regulator fitted.
Note! Additional pressure losses may occur
depending on your outlet configuration and
fittings used.
Typical flow rates on low pressure systems
(0.1 to 1 Bar) mixer valve and divertor only with
open outlet.
For Type 2 Valves, the supply conditions specified
in section: ‘Type 2 Valves - Application’ take
precedence over the operating parameters which
follow.
Pressures
• Max Static Pressure: 10 Bar.
• Max Maintained Pressure: 5 Bar.
• Min Maintained Pressure (Gravity System):
•
Pressure vs Flow
60
Flow Rate (l/min)
0.1 Bar (0.1 bar = 1 Metre head from cold tank
base to showerhead outlet).
Note! For gravity fed or other low pressure
systems (0.5 bar or below) do not fit the outlet
flow regulator.
For optimum performance supplies should be
nominally equal.
Open Outlet
50
40
30
20
12 l/min flow reg.
10
Temperatures
0
• Override Blend Temperature: 39°C.
• Maximum Blend Temperature: 44°C.
• Optimum Thermostatic Control Range: 35°C
•
•
1
2
3
Inlet Pressure (Bar)
4
Dimensions
186 mm
to 43°C (achieved with supplies of 15°C cold,
65°C hot and nominally equal pressures).
Recommended Hot Supply: 60°C to 65°C
Note! The mixing valve can operate at
higher temperatures for short periods without
damage, however this could detrimentally
affect thermostatic performance. For safety
and performance reasons it is recommended
that the maximum hot water temperature is
limited to 65°C.
Cold Water Range: up to 25°C.
Minimum Recommended Differential between
Hot Supply and Outlet Temperature: 12°C.
231 mm
•
0
Thermostatic Shut-down
16.5 mm
• For safety and comfort the thermostat will
shut off the mixing valve within 2 Seconds if
either supply fails (achieved only if the blend
temperature has a minimum differential of
12°C from either supply temperature).
Connections
• Inlets: 15 mm Compression.
• Outlets: 15 mm Compression
• Standard connections are: hot - left, cold right, outlets - top left and top right.
69 - 88 mm 49 mm
5
5
Installation Methods
Rear Fixing
For installation into a Solid Wall or Stud Partition
using the Rear Fixing Points, go to section:
‘Installation, Solid Wall or Stud Partition Using
Rear Mountings’.
Behind Panel Fixing
For installation behind a Laminated Panel using
the Securing Brackets, go to section: ‘Installation,
Panel Fixing using Securing Brackets - Mounting
off Rear Face’.
Front Face Fixing
For installation securing on the front face into a Solid
Wall or Stud Partition using the Securing Brackets, go
to section: ‘Installation, Solid Wall or Stud Partition
Fixing using Securing Brackets’.
6
5.Do not install the product in a position in which
service access is restricted.
6. Pipework dead-legs should be kept to a
minimum.
7.Decide on a suitable position for the Mixer
and outlet fittings. If you are installing variable
shower fitttings then they must provide
a minimum gap of 25 mm between the
spill‑over level of the shower tray/bath and
the showerhead (refer to illustration). This is
to prevent back-siphonage.
Note! Only use Shower Fittings recommended
by the manufacturer or supplier.
8.All pipework must be checked for leaks before
the product installation is completed. The
product should be pressurised and the inlet
and outlet connections inspected.
Installation
Suitable Plumbing Systems
Gravity Fed:
The thermostatic mixer must be fed from a cold
water cistern (usually fitted in the loft space) and
a hot water cylinder (usually fitted in the airing
cupboard) providing nominally equal pressures.
Mains Pressurised Instantaneous Hot Water
System (Combination Boiler):
The thermostatic mixer can be installed with
systems of this type with balanced pressures.
(Recommended Minimum Maintained Pressure:
1.0 Bar).
Unvented Mains Pressure System:
The thermostatic mixer can be installed with an
unvented, stored hot water system.
Hose Retaining Ring
Pumped System:
The thermostatic mixer can be installed with an
inlet pump (twin impeller). The pump must be
installed in a suitable location and in accordance
with its instructions.
General
Installation must be carried out in accordance
with these instructions, and must be conducted by
designated, qualified and competent personnel.
The plumbing installation must comply with the
requirements of UK Water Regulations/Bye-laws
(Scotland), Building 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 section:
‘Specifications’. For Type 2 Valves see also
supply conditions in section: ‘Type 2 Valves’.
25 mm Spill
Over Level
1. The Mixer must not be installed in an area
where it may freeze.
2. For stud partitions alternative fixings may be
required.
3. Isolating valves must be installed close to the
Mixer for ease of maintenance.
4. Pipework must be rigidly supported and avoid
any strain on the connections.
7
Solid Wall or Stud Partition Fixing
Using Rear Mountings
5. Cut away the plasterboard or brick work to the
required depth.
Important! This depth ‘X’ will depend on the
finished wall thickness e.g. tiles or facia board.
Refer to the table for this measurement.
For stud partitions depth ‘X’ refers to the
distance from the rear mounting e.g. wooden
baton, to the front of the wall (before tiling).
1.Determine the route for the hot and cold supply
pipework and for the outlet pipework. If you
are connecting to BIV Shower Fittings it is
recommended that the outlet be positioned
above and to one side of the mixer. This is to
prevent the flexible hose from obstructing the
shower controls.
2. Determine the position of the mixer and mark
a maximum hole size of 150 mm x 170 mm.
Note! Use a spirit level to make sure that the
hole will be horizontal and vertical.
Rear Mounting
Finished Wall
Surface
Temperature
Hub
170 mm
Temperature
Drive Extender
Depth ‘X’
150 mm
3.Mark the routes for the hot and cold supply
pipework.
4.Mark the routes for the outlet pipework.
Outlet Pipe A
Hot Inlet
Outlet Pipe B
Cold Inlet
Thermostatic
Mixer
8
Finished Wall
Thickness
Note! Column 3 in the table below refers to a
red temperature drive extender that will need
to be fitted onto the temperature hub if depth
‘X’ exceeds the value shown.
Finished
Wall
Thickness
(e.g. tile and
adhesive)
Wall Cutout
Depth ‘X’
Red
Extender
required if
Depth ‘X’
exceeds:
6
64 - 82 mm
74 mm
8
62 - 80 mm
72 mm
10
60 - 78 mm
70 mm
12
58 - 76 mm
68 mm
14
56 - 74 mm
66 mm
16
54 - 72 mm
64 mm
18
54 - 70 mm
62 mm
20
54 - 68 mm
60 mm
22
54 - 66 mm
58 mm
24
54 - 64 mm
56 mm
6.Offer up the mixer valve into the hole, make
sure that it is level, central, and square
to the finished wall surface (or the control
components will not fit correctly), then mark
the positions of the fixing screw holes through
the building-in shroud and onto the wall.
Important! There are various shower fittings,
spouts, bath fillers etc. that can be used
with this product, refer to the appropriate
installation instructions supplied with your
outlet fittings and install the outlet pipework
to suit.
Spirit Level
Fixing Points (mark
through shroud)
14.Turn on the water supplies and check for
leaks.
Note! Cap off the outlet pipes and operate the
divertor to check the outlet connections.
7. For solid walls and stud partitions drill three 6
mm holes for the wall plugs.
Note! For stud partition installations alternative
fixings may be required (not supplied) to fix the
mixer to the rear face of the wall cavity or to a
timber noggin.
8. Install the hot and cold supply pipes into the
wall (Hot - Left, Cold - Right).
9. Caution! It is essential at this point
that the supply pipework is thoroughly
flushed through before connection to the
mixer. Failure to do so may result in product
malfunction and will not be covered under the
guarantee.
10.Remove the three shroud screws (retain for
later use) and remove the building-in shroud
from the mixer.
11.Insert the wall plugs (supplied) and attach the
mixer to the wall with the screws provided.
12.Make sure that the olives are fitted and connect
the hot and cold supply pipes to the mixer and
tighten the compression nuts.
13.Fit the outlet pipes from the mixer and tighten
the compression nuts.
Note! Leave enough pipe through the wall to
temporarily cap off.
9
Panel Fixing using Securing
Brackets - Mounting off Rear Face
15.Re-fit the building-in shroud to the shower
valve using the three fixing screws.
16.Using the building-in shroud as a guide for the
finished wall thickness, finish the wall.
Caution! Make sure that the finished wall
is within the minimum and maximum limits
otherwise the control components will not fit
correctly.
Note! For laminated panels the mixer must be
positioned from the rear of the panel.
Panel thickness must be between 4 and 22 mm
(if a thicker panel is used, it will be necessary
to recess the securing brackets into the rear of
the panel).
Important! Make sure that there is a minimum
clearance of 66 mm behind the laminated panel
to house the mixer.
1. Refer to section: ‘Solid Wall or Stud Partition
Fixing using Rear Mountings’ and follow
instructions 1 to 4.
2. Carefully cut out the laminated panel.
3.Remove the screws and remove the building-in
shroud (retain the screws for later use).
4. Fit the securing brackets to the mixer.
Important! The securing brackets must be
fixed vertically, as illustrated.
MIN
MAX
Fixing Screws
M5 Fixing Hole
17.R emove the building-in shroud. Retain
the three securing screws for securing the
backplate.
18.Install the outlet fittings, refer to your fittings
installation and user guide for instructions.
19.Fit the control assembly, refer to section:
‘Control Assembly’.
M5 Fixing Hole
5. Re-fit the building-in shroud to the shower
valve using the three fixing screws.
10
8. Install the hot and cold supply pipes (Hot - Left,
Cold - Right).
9. Caution! It is essential at this point
that the supply pipework is thoroughly
flushed through before connection to
the mixer. Failure to do so may result in
product malfunction and may invalidate your
guarantee.
10.Remove the screws and remove the building-in
shroud (retain the screws for later use).
11.Secure the shower valve (positioned from the
rear of the panel) with the M5 x 40 mm fixing
screws.
12.Make sure that the olives are fitted and connect
the hot and cold supply pipes to the mixer and
tighten the compression nuts.
13.Fit the outlet pipes from the mixer and tighten
the compression nuts.
Note! Leave enough pipe through the wall to
temporarily cap off.
Important! There are various shower fittings,
spouts, bath fillers etc. that can be used
with this product, refer to the appropriate
installation instructions supplied with your
outlet fittings and install the outlet pipework
to suit.
14.Turn on the water supplies and check for
leaks.
Note! Cap off the outlet pipes and operate the
divertor to check the outlet connections.
15.Install the outlet fittings, refer to your fittings
installation and user guide for instructions.
16.Fit the control assembly, refer to section:
‘Control Assembly’.
M5 Fixing Hole
M5 Fixing Hole
6. To assist in marking the positions of the fixing
holes, reverse the shower valve and fit the
building in shroud through the cutout in the
front of the panel. Mark the positions of the
M5 fixing holes.
Important! Make sure that the correct holes
are used (refer to illustration).
Securing Screws
Securing Screws
7. Drill the three 5 mm fixing holes (countersink
the holes at the front).
11
Solid Wall or Stud Partition Fixing
using Securing Brackets
4.Remove the building-in shroud
5. Fit the securing brackets to the mixer.
Important! The securing brackets must be
fixed vertically, as illustrated.
Important! Make sure that the correct holes
are used, otherwise the backplate cannot be
fitted.
1. Refer to section: ‘Solid Wall or Stud Partition
Fixing using Rear Mountings’ and follow
instructions 1 to 4.
6 mm Finished
Wall Surface
Securing
Bracket
Finished Wall
Securing
Screw
24 mm Finished
Wall Surface
66 mm Min
2. Cut away the plasterboard or brick work to a
minimum depth of 66 mm to accomodate the
shower valve body, the hot and cold supply
pipework and the outlet pipework.
3. Make sure that the building-in shroud fits inside
the hole cutout.
Securing
Bracket
Securing
Screw
6. Mark the positions of the countersunk fixing
holes on the wall.
Note! Make sure that they do not interfere with
the pipework.
7. Drill three 6 mm holes for the wall plugs.
8. Fit the wall plugs (supplied) and secure the
shower valve to the wall with the securing
screws (supplied).
Note! For stud partition installations alternative
fixings may be required (not supplied).
Important! At this point position the building-in
shroud onto the shower valve and make sure
that it is horizontal and will be parallel to the
finished wall surface.
9. Remove the building-in shroud and fit the hot
and cold supply pipes and outlet pipe and
tighten the compression nuts.
Caution! Make sure that the olives are fitted
and all pipework is flushed through before
connecting to the shower valve.
10.Fit the outlet pipes from the mixer and tighten
the compression nuts.
Note! Leave enough pipe through the wall to
temporarily cap off.
Countersunk
Fixing Hole
Countersunk
Fixing Hole
12
Important! There are various shower fittings,
spouts, bath fillers etc. that can be used
with this product, refer to the appropriate
installation instructions supplied with your
outlet fittings and install the outlet pipework
to suit.
MIN
MAX
Spirit Level
Building-in
Shroud
Securing
Screws
11.Turn on the water supplies and check for
leaks.
Note! Cap off the outlet pipes and operate the
divertor to check the outlet connections.
12.Re-fit the building-in shroud to the shower
valve using the three fixing screws.
13.Using the building-in shroud as a guide for the
finished wall thickness, finish the wall.
Caution! Make sure that the finished wall
is within the minimum and maximum limits
otherwise the control components will not fit
correctly.
14.R emove the building-in shroud. Retain
the three securing screws for securing the
backplate.
15.Install the outlet fittings, refer to your fittings
installation and user guide for instructions.
16.Fit the control assembly, refer to section:
‘Control Assembly’.
13
Control Assembly
3. Fit the backplate to the shower control
and secure with the three securing screws
(removed from the building-in shroud). Make
sure that the seal is fully compressed on the
finished wall surface.
Note! If the finish is particularly uneven (i.e.
due to grout lines), apply a small amount of
silicone sealant to ensure a seal.
Caution! Do not overtighten the screws as this
may cause the backplate to distort, preventing
the fitting of the control knobs.
4. Align the flow control hub with the taper
towards the top of the shower control (refer
to illustration).
Concealing Plate
Temperature
Knob
Push up and Latch over
the Top of the Backplate
Cutout
Align Flow Lever as
Shown
1. Pull off the temperature knob.
2. Carefully separate the concealing plate from
the backplate.
Note! Use a screwdriver in the cutout to assist
separation.
Flow Control Hub
‘Click’ into Position
5. Align the flow control lever so that the lever is
pointing up (refer to illustration).
6. Slide the flow control lever and concealing
plate over the flow control hub.
7. Latch the top of the concealing plate over the
top of the backplate.
Note! You will need to push the concealing
plate up and over the lip on top of the backplate
and apply firm pressure to the flow lever (refer
to illustration).
8.Clip the bottom of the concealing plate into
position.
9.Align the temperature control knob with the
hub and push the knob onto the concealing
plate so it clicks into place.
Note! The Thermostatic Shower Control is
preset to approximately 44°C at the factory
and the override is set to approximately 39°C.
If adjustment is required, refer to section:
‘Commissioning’.
Backplate (Seal
on Rear)
Securing Screws
14
Operation
Reversed Inlet Supplies
The Mira Discovery with Diverter thermostatic
mixer is supplied with inlet connections Hot - Left,
Cold - Right as standard. If the hot and cold
water supply pipes have been reversed during
installation the thermostatic cartridge must be
removed and rotated 180°.
Position 1
Can be either
showerhead or
bath filler
OFF Position
HOT
Position 2
Can be either
showerhead or
bath filler
COLD
Temperature Knob
1. Isolate the hot and cold water supplies and
operate the control lever to relieve pressure
and drain any residual water.
2. Pull off the temperature knob.
3. Unclip and remove the concealing plate.
Note! Use a screwdriver in the slot at the
bottom of the concealing plate to lever off.
4. Using a suitable spanner, turn the cartridge
nut and turn anticlockwise. Unscrew and pull
the cartridge clear from the body.
5. Rotate the cartridge 180°.
6. Make sure that the two cartridge side seals
are fitted and carefully push into the cartridge
body.
Important! Make sure that the cartridge side
seals do not extrude from the body when
pushing the cartridge in. Damage to these
seals may result in incorrect operation.
7. Position the cartridge lugs into the body slots
and tighten clockwise.
8. Restore the hot and cold water supplies and
check for leaks.
9. Refer to section: ‘Installation, Control
Assembly’ and follow instructions 3 to 9.
Flow Regulation
The diverter outlet of the shower operates either
fully on or off. If the shower is too forceful or flow
rate too high then 2 x 12 l/min flow regulators are
provided. These can be installed in the Discovery
fixed showerhead and/or in the hose between the
wall connector ( RAC )
15
6.Once the desired maximum blend temperature
has been achieved, refit the temperature hub
without disturbing the spindle, positioning the
temperature hub so that the lug is against the
left side of the stop on the cartridge face (refer
to illustration). Make sure that the temperature
has not altered.
Commissioning
Maximum Temperature Setting
Before using the shower the maximum temperature
must be checked to make sure that it is at a
safe level. It has been preset to approximately
44°C at the factory but due to variations in site
conditions the maximum temperature may need
adjustment.
Note! Make sure that the hot water temperature is
at least 55°C and that there is sufficient supply.
For Type 2 installations the maximum blend
temperature is determined by the application,
refer to section: ‘Type 2 Valves - Application’.
Override Stop Setting
The override stop is designed to give the user an
indication of the maximum showering temperature
(39°C). This is preset at the factory but due
to variations in site conditions the maximum
temperature may need adjustment.
Override Cap
Temperature
Spindle
Temperature Hub
Temperature
Knob
1. Lift the override cap and rotate to adjust
the temperature (clockwise decreases the
temperature).
Cartridge
Face Stop
1. Pull-off the temperature knob.
2. Unscrew the temperature hub with a 3 mm
hexagon key (supplied).
4. Operate the flow control lever.
5. Rotate the spindle until required maximum
blend temperature is obtained at discharge
point (clockwise = decrease temperature).
Caution! When resistance is felt do not use
force to turn any further, as this can damage
the internal parts.
16
The British Burns Association recommends 37
to 37.5°C as a comfortable bathing temperature
for children. In premises covered by the Care
Standards Act 2000, the maximum mixed water
outlet temperature is 43°C.
Type 2 Valves
Application
The approved designations for Type 2 Valves
are as follows:
Models
The thermostatic mixing valve will be installed in
such a position that maintenance of the TMV and
its valves and the commissioning and testing of
the TMV can be undertaken.
Designation
Mira Discovery with
HP-S, LP-S, HP-B
Divertor
Important! The fitting of any flow regulator
will invalidate TMV2 compliance due to the
minimum flow rate requirements. Do not fit
flow regulators in TMV2 applications.
The fitting of isolation valves is required as close
as practicable to the water supply inlets of the
thermostatic mixing valve.
Conditions of use for Type 2 Valves
Operating Pressure
Range
High
Pressure
Low
Pressure
10
10
Maintained Pressure,
Hot and Cold (bar)
0.5 to 5
0.1 to 1
Hot Supply
Temperature (°C)
55 to 65
55 to 65
Maximum Static
Pressure (bar)
Commissioning notes for Thermostatic Mixing
Valves
The first step in commissioning a thermostatic
mixing valve is to check the following:
The designation of the thermostatic mixing valve
matches the application.
The supply pressures are within the valves
operating range.
The supply temperatures are within the valves
operating valve.
Isolating valves (and strainers preferred) are
provided.
If all of these conditions are met, proceed to
set the temperature as specified in section:
‘Commissioning’.
Cold Supply
≤25
≤25
Temperature (°C)
Valves operating outside these conditions cannot
be guaranteed to operate as Type 2 Valves.
Recommended Outlet Temperatures
The BuildCert TMV scheme recommends the
following set maximum mixed water outlet
temperatures for use in all premises:
44°C for bath fill, but see notes below;
41°C for showers.
The mixed water temperatures must never
exceed 46°C.
The maximum mixed water temperature can be
2°C above the recommended maximum set outlet
temperatures.
Note! 46°C is the maximum mixed water
temperature from the bath tap. The maximum
temperature takes account of the allowable
temperature tolerances inherant in thermostatic
mixing valves and temperature losses in metal
baths.
It is not a safe bathing temperature for adults
or children.
Important! The mixed water temperature at the
discharge point must never exceed 46°C.
It is a requirement that all TMV2 approved
valves shall be verified against the original
set temperature results once a year. When
commissioning/testing is due the following
performance checks shall be carried out.
Measure the mixed water temperature at the
outlet.
Carry out the cold water supply isolation test by
isolating the cold water to the TMV, wait for five
seconds if water is still flowing check that the
temperature is below 46°C.
If there is no significant change to the set outlet
temperature (±2°C or less change from the
original settings) and the fail-safe shut off is
functioning, then the valve is working correctly
and no further service work is required.
Notes! If there is a residual flow during the
commissioning of the valve or the annual
verification (cold water supply isolation test), then
17
this is acceptable providing the temperature of
the water seeping from the valve is no more than
2°C above the designated maximum mixed water
outlet temperature setting of the valve.
Temperature readings should be taken at the
normal flow rate after allowing for the system to
stabilise.
The sensing part of the thermometer probe
must be fully submerged in the water that is to
be tested.
Any TMV that has been adjusted or serviced must
be re-commissioned and re-tested in accordance
with the instructions given in this guide.
Fault Diagnosis
If you require a Mira trained service engineer or
agent, refer to section: ‘Customer Services’.
Fault Diagnosis
Symptom:
Only hot or cold water from the mixer outlet.
Outlet temperature too hot / too cold.
•
•
Cause / Rectification:
Inlets reversed (hot supply to cold supply).
No hot water reaching mixer.
Check the filters for any blockage.
Installation conditions outside operating
parameters, refer to sections: ‘Specifications’
and ‘Commissioning’.
•
•
•
•
The installation of thermostatic mixing valves must
comply with the requirements of the Water Supply
(Water Fittings) Regulations 1999.
—————————————
Symptom:
Fluctuating or reduced flow rate.
•
Cause / Rectification:
Check the showerhead, hose and filters for
any blockage and clean.
Make sure that the maintained inlet pressures
are nominally balanced and sufficient, refer to
section: ‘Specifications’.
Make sure that the inlet temperature
differentials are sufficient, refer to section:
‘Specifications’.
Flow regulator fitted incorrectly.
Air lock or partial blockage in the pipework.
•
•
•
•
•
—————————————
Symptom:
Water leaking from showerhead outlet.
•
Cause / Rectification:
Normal for a short period after shut off.
Check that the pressures are not in excess of
the specifications for the product.
Renew the thermostatic cartridge.
•
•
•
—————————————
Symptom:
Shower too forceful water flow rate too high.
•
Cause / Rectification:
Flow regulator not fitted. See Operation
•
18
Maintenance
General
This Product 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 Mira Discovery with Divertor thermostatic mixer
is designed to need only minimal maintenance in
normal use. The only serviceable parts are the
inlet filters which should be checked and cleaned
every 12 months. If a malfunction occurs with the
thermostatic cartridge then this will necessitate a
complete cartridge replacement.
Note! The cartridge contains no internally
serviceable parts.
If you require a Mira trained engineer or agent,
refer to section: ‘Customer Service’.
Inlet Filter
Check Valve
Lubricants
Silicone based lubricants must only be used on
the rubber seals.
Caution! Oil based or other lubricant types may
cause rapid deterioration of seals.
Cleaning
The chrome plated parts should be cleaned using
a mild washing up detergent or soap solution,
rinsed and then wiped dry with a soft cloth.
Warning! Many household cleaners contain
abrasive and chemical substances, and should not
be used for cleaning plated or plastic fittings.
Do not use descalents on this product.
1. Isolate the supplies to the shower control and
operate the flow control to drain any residual
water.
2. Unclip and remove the concealing plate.
3. Unscrew the 3 backplate securing screws and
remove the backplate.
4. Unscrew the filter caps with a 10 mm
hexagonal wrench.
5. Remove the inlet filters and check valves.
6. Clean each inlet filter and check valve in turn
under a jet of water to remove any lodged
particles.
7. Re-fit the check valves and inlet filters and
tighten the filter caps.
8.Restore the water supplies and check for
leaks.
9.Reassemble the shower control (refer to
section ‘Installation, Control Assembly’.
Inlet Filters and Check Valves
The inlet filters and check valves should be
checked and cleaned as necessary every 12
months.
Note! The inlet filters and check valves must
not be removed except for cleaning. If the
thermostatic mixer is operated without the inlet
filters or check valves fitted the warranty on the
product will be void.
19
Divertor Filter
Note! The filters must not be removed except for
cleaning. If the thermostatic mixer is operated
without the inlet filters or check valves fitted the
warranty on the product will be void.
Cartridge
Filter
Cover
Cartridge
1. Isolate the supplies to the shower control and
operate the flow control to drain any residual
water.
2. Unclip and remove the concealing plate.
3. Unscrew the 3 backplate securing screws and
remove the backplate.
4.Remove the three screws that hold the cover
in place.
5. Remove the cover and remove the filter.
6. Clean the filter under a jet of water to remove
any lodged particles.
7. Re-fit the filter.
8. Re-fit the cover making sure that the orientation
is correct.
9.Restore the water supplies and check for
leaks.
10.Reassemble the shower control (refer to
section ‘Installation, Control Assembly’.
1. Isolate the hot and cold water supplies and
operate the control lever to relieve pressure
and drain any residual water.
2. Pull off the temperature knob.
3. Unclip and remove the concealing plate.
Note! Use a screwdriver in the slot at the
bottom of the concealing plate to lever off.
4. Using a suitable spanner, turn the cartridge
nut and turn anticlockwise. Unscrew and pull
the cartridge clear from the body.
5. Discard the cartridge.
6. Make sure that the two cartridge side seals are
fitted to the new cartridge and carefully push
into the cartridge body.
Important! Make sure that the cartridge side
seals do not extrude from the body when
pushing the cartridge in. Damage to these
seals may result in incorrect operation.
7. Position the cartridge lugs into the body slots
and tighten clockwise.
8. Restore the hot and cold water supplies and
check for leaks.
9. Refer to section: ‘Installation, Control
Assembly’ and follow instructions 3 to 9.
20
Spare Parts
1142347
Diverter Control Assembly
1142350
Diverter Assembly
A
1142349
Diverter Cap
A
1691.145
Outlet Adapter (89 ctrs)
A
A
A
A
1691.144
Detent and Flow Hub
1142348
Diverter Filter Pack
1142354
Filter and Checkvalve
Assembly
A
A
A
1624.114
Outlet Plug
1624.112
Filter
A
1142352
Nut and Olive
Pack
1142351
Flow Regulator
Pack
1691.143
Screw and Component Pack
1691.142
Concealing Plate
Assembly
1142356
O Seal Pack - Components Identified ‘A’
21
1142355
Cartridge Assembly
Spare Parts
450.20
RAC Mounting Pack
1595.035
Right Angle Connector (RAC) Shroud
22
Accessories
Genuine Mira accessories can be purchased direct from Customers Services (our contact details can be found on
the back cover of this guide) or from approved stockists or merchants.
Shower Seat
White - 2.1536.128
White/Chrome - 2.1536.129
For use in or out of the showering
area. Note! Must be installed onto a
solid wall.
Shower seat folds up when not in use
Showerhead Holder
White - 2.1605.149
Chrome - 2.1605.150
If you're looking for additional
flexibility in your shower, the Mira
Logic Showerhead Holder is the
perfect solution. Makes showering
easier for children, provides a
useful additional holder for your
Showerhead which fixes to the wall at
the desired height.
Wall Mounted Soap Dish
White - 1.1540.278
Chrome - 1.1540.279
Wall mounted for use anywhere in, or
outside the showering area.
Overflow Filler
Chrome - 2.1605.140
A discreet bath filler concealed
within the bath overflow for use with
concealed pipework.
Deck Mounted Bath Filler
Chrome - 2.1605.146
A Deck mounted bath fill spout for
use with concealed pipework.
Wall Mounted Bath Filler
Chrome - 2.1605.147
A Wall mounted bath fill spout for use
with concealed pipework.
Discovery Variable Fittings Kit
Chrome - 1.1595.029
Stylish shower fittings including a
four mode shower handset, hose
and slide bar for variable height
positioning.
Discovery Single Spray Fixed
Showerhead
Chrome - 1.1595.029
Stylish single spray fixed overhead
shower fitting with adjustable spray
direction.
23
Customer Services
Guarantee
Your product has the benefit of our manufacturer’s
guarantee which starts from the date of purchase.
To activate this guarantee, please return your completed
registration card, visit our website or free phone 0800
0731248 within 30 days of purchase (UK only).
Within the guarantee period we will resolve defects in
materials or workmanship, free of charge, by repairing or
replacing parts or product as we may choose.
This guarantee is in addition to your statutory rights
and is subject to the following conditions:
● The product must be installed and maintained in
accordance with the instructions given in this user
guide.
● Servicing must only be undertaken by us or our
appointed representative. Note! if a service visit
is required the product must be fully installed and
connected to services.
● Repair under this guarantee does not extend the original
expiry date. The guarantee on any replacement parts
or product ends at the original expiry date.
● For shower fittings or consumable items we reserve
the right to supply replacement parts only.
The guarantee does not cover:
● Call out charges for non product faults (such as
damage or performance issues arising from incorrect
installation, improper use, lack of maintenance, build up
of limescale, frost damage, corrosion, system debris or
blocked filters) or where no fault has been found with
the product.
● Water or electrical supply, waste and isolation issues.
● Compensation for loss of use of the product or
consequential loss of any kind.
● Damage or defects caused if the product is repaired
or modified by persons not authorised by us or our
appointed representative.
● Routine maintenance or replacement parts to comply
with the requirements of the TMV 2 or TMV 3 healthcare
schemes.
Helpdesk Service
Our dedicated Customer Services Team is comprehensively
trained and can offer help and advice, spare parts,
accessories or a service visit. We will need you to have your
model name or number, power rating (if applicable) and date
of purchase. As part of our quality and training programme
calls may be recorded or monitored.
Mira Showers Website (www.mirashowers.co.uk)
From our website you can register your guarantee,
download additional user guides, diagnose faults, purchase
our full range of accessories and popular spares, refer to
our FAQ’s and request a service visit.
Spares and Accessories
We maintain extensive stocks of genuine spares and
accessories and aim to provide support throughout the
product’s expected life. Payment can be made by phone
at time of order using most major Credit or Debit cards and
we aim to despatch orders within two working days. Items
purchased from us are guaranteed for 12 months from date
of purchase. For safety reasons spares exposed to mains
voltages should only be fitted by competent persons.
Returns – items can be returned within one month of date of
purchase, providing that they are in good condition and the
packaging is unopened. Please obtain authorisation from
our Customer Services Team before return. We reserve the
right to apply a 15% restocking charge.
Service / Repairs
We have a nationwide team of Service Technicians who can
carry out all service or repair work to your product within the
guarantee period and beyond. You have the assurance of a
fully trained Mira Technician, genuine Mira spare parts and
a 12 month guarantee on any chargeable work done.
Payment should be made directly to the Service Technician
who will accept most major Credit or Debit cards.
To Contact Us
UK
Telephone: 0844 571 5000
Mon to Fri 8:00 am - 5:30 pm, Sat 8:30 am - 3:30 pm
E-mail: technical@mirashowers.com
If your product does not function correctly when you first Fax: 01242 282595
use it, contact your installer to check that it is installed By Post: Mira Customer Services Dept, Cromwell Road,
and commissioned in accordance with the instructions in Cheltenham, Gloucestershire, GL52 5EP
this manual.
Should this not resolve the issue, contact our Customer Eire
Services Team who will offer you or your installer advice and Telephone: 01 459 1344
if applicable arrange for a Service Technician to call.
Mon to Fri 9:00 am - 5:00 pm
If the performance of your product declines, check in this E-mail: sales@modernplant.ie
manual to see if simple home maintenance is required. If Fax: Dublin 01 459 2329
you require further assistance call our Customer Services
By Post: Modern Plant Ltd (Dublin),
Team.
Otter House, Naas Road, Clondalkin, Dublin 22
What to do if something goes wrong
Extended Guarantees
A selection of protection plans are available that
enable you to cover repair bills for the life of your policy
(excludes Eire). Ring 01922 471763 for more details.
Mira is a registered trade mark of
Kohler Mira Limited.
The company reserves the right to alter
product specifications without notice.
1138484-W2-A (1691)
5+!3
24
© Kohler Mira Limited, January 2010