Mira REALM Owner's manual

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

2
ii
Contents
Section
Page
1..... Important Safety Information .......................................... 3
2..... Introduction ....................................................................... 4
3..... Pack Contents Checklist:
Realm shower control ................................................ 5
4Specifications:
Pressure range .......................................................... 6
Temperature control .................................................. 6
Plumbing Connections .............................................. 6
5..... Installation Requirements:
General ..................................................................... 7
Typical suitable installations ..................................... 7
6..... Installation:
General ................................................................... 13
7..... Commissioning .............................................................. 16
8..... Operation:
Realm ...................................................................... 18
9..... Maintenance:
Fault Diagnosis ....................................................... 19
Cleaning .................................................................. 20
Appendices:
1..... Dimensions:
Realm...................................................................... 21
2..... Spare parts:
Realm spare parts list.............................................. 22
Realm spare parts diagram ..................................... 23
Guarantee, Customer Care ....................................... Back cover

3
Section
1Important Safety Information
1. 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.
2. 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 installation must be carried out by a competent installer.
2.6. The plumbing installation must comply with the requirements of UK Water
Regulations/Bye-laws (Scotland), Building Regulations or any particular
regulations and practices, specified 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:
2.6.1. Institute of Plumbing (IOP), throughout the UK.
2.6.2. National Association of Plumbing, Heating and Mechanical Services
Contractors (NAPH & MSC), England and Wales.
2.6.3. Scottishand NorthernIreland PlumbingEmployers’ Federation(SNIPEF),
Scotland and Northern Ireland.
2.7. 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.

4
2
Section Introduction
If you experience any difficulty with the installation or operation of your new shower
control, then please refer to Section 9, Maintenance: “1.Fault diagnosis”,
before contacting Mira Showers. Our telephone and fax numbers can be found on
the back cover of this guide.
Thank you for purchasing a quality Mira product. To exploit the full potential of your new
shower, please take time to read this guide thoroughly, having done so, keep it handy
for future reference.
The Mira Realm is a single point 1/2" thermostatic shower mixer incorporating a wax
capsule thermostat to ensure constant showering temperatures. The single sequential
control eliminates the possibility of hot water being delivered when initially turning on
the shower control.
The Mira Realm Thermostatic 1/2" Shower Control comes complete with integral flow
regulators which increase the capability of the shower control to cope with pressure
imbalances when used in conjunction with combination boilers and multi-point gas
water heaters of the modulating type.
The Mira Realm Thermostatic 1/2" Shower Control is guaranteed against any defect
of materials or workmanship for one year from the date of purchase.
Mira Realm Surface mounted shower control for connection to exposed
pipework. A rigid riser pipe, shower head and wall brackets are
supplied. Chrome and light golden models are available.

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3
Section Pack Contents Checklist
1. Realm Shower Control
¨Tick the appropriate boxes to familiarize yourself with the part names and to
confirm that the parts are included.
ü
1 x Mira Realm Shower Control ¨
1 x Horizontal Arm ¨
1 x Shower Head ¨
3 x Wall Plugs ¨
2 x Pipe Concealing Plates ¨
3 x Wall Plugs ¨
2 x Regulators ¨
1 x 2.5 mm A/F
Hexagon Wrench
¨
2. Documentation
1 x Installation, Operation and Maintenance Guide ¨
1 x Customer Support Brochure ¨
1 x Installer Registration Card ¨
1 x Rigid Riser Pipe ¨
3 x No. 10 x 1 1/4" Screws ¨
3 x No. 8 x 1 1/4" Screws ¨
1 x Wall Bracket ¨

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4
Section Specifications
1. Pressure range
1.1. Minimum operating pressure (Gas Water Heater) 1.0 bar.
1.2. Minimum operating pressure (Gravity Feed) 0.1 bar.
1.3. Maximum maintained pressure 3.0 bar.
1.4. Maximum static pressure 10.0 bar.
1.5. Maximum pressure loss ratio 5:1.
2. Temperature control
2.1. Single sequential lever allows the temperature selected to range from the cold
water supply temperature through to a pre-set maximum.
2.2. The maximum blend temperature is factory set at 42 °C. This can be reset
according to site requirements.
2.3. Accurate maximum blend temperatures can be set using typical inlet supply
temperatures:- Cold 10 - 15 °C, Hot 60 - 65 °C.
2.4. The inlet water temperature should be at least 10 °C above the required blend
temperature to ensure correct shower performance.
2.5 Maximum hot water inlet supply temperature 82 °C.
Note! The shower control can accept temporary temperature excursions above
82°C without damage, however operation at such elevated supply temperatures is
not recommended. For reasons of general safety, hot water storage temperatures
should ideally be maintained at between 60-65°C where serving ablutionary applica-
tions.
3.Plumbing Connections
The shower control connections are all 15mm compression (nuts and olives are
provided).
Hot and Cold inlets are clearly marked for the shower control and must be con-
nected as described in the Installation section.

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5
Section Installation Requirements
1. General
Read the section "Important Safety Information" first.
1.1. Supply pipework MUST be flushed to clear debris before connecting the shower
control.
1.2. Do not fit any form of flow control in the outlet pipework.
1.3. Do not install the product in a position where it could become frozen.
1.4. Layout and sizing of pipework must be such that when other services are used,
pressures at the shower control do not fall below the recommended minimum,
or outside the 5:1 pressure loss ratio.
1.5. Conveniently situated isolating valves MUST be fitted for servicing purposes.
1.6. If the shower control is to be used with a multipoint water heater, combination
boiler, thermal store or unvented system an expansion vessel must be fitted to
accommodate the expansion of water in the domestic hot water supply (this
may already be part of the system, check with the appliance manufacturer).
1.7. Do not use excessive force when making connections.
1.8. Do not install the shower control in a position that restricts service access.
2. Typical suitable installations
Key to symbols
5
Float operated valve
Stop or servicing valve
Shower control
Warning or overflow pipe
Drop tight pressure reducing valve
(PRV)
Twin impeller inlet pump
Single impeller outlet pump
Tempering valve
Mini expansion vessel
Non-return Valve

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2.1. Instantaneous gas-heated showers (e.g. 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).
A drop tight pressure reducing valve (PRV) MUST be fitted if the supply
pressures exceed 3 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. The expansion vessel may already be fitted within the boiler
(check with the manufacturer) and is in addition to the normally larger central
heating expansion vessel.
The layout and sizing of pipework MUST be such that nominally equal inlet
supply pressures are achieved AND the effects of other draw-offs are
minimized.
The hot supply temperature MUST be at least 10 °C hotter than the required
blend temperature for optimum performance.

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2.2. Gravity fed showers - The shower control MUST be fed from a cold water
storage cistern and hot water cylinder providing nominally equal pressure.

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2.3. Mains pressurised instantaneous hot water shower, heated from a
thermal store - Packages of this type, fitted with a tempering valve can be used
with the Mira Realm. A drop tight pressure reducing valve MUST be fitted
if the supply pressures exceed 3 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. The expansion vessel may already be fitted externally or
internally within the thermal store (check with thermal store manufacturer).
The layout and sizing of pipework MUST be such that nominally equal inlet
supply pressures are achieved AND the effects of other draw-offs are minimized.

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Safety devices
not
shown for clarity
2.4. 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 3 bar. The drop tight pressure reducing valve must be
set at the same value as the unvented package pressure reducing valve.
Note! 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.
The layout and sizing of pipework MUST be such that nominally equal inlet
supply pressures are achieved AND the effects of other draw-offs are minimized.
HOT
COLD
Combined outlet PRV
with internal non-return valves
- Expansion vessel required.
Cold take-off after PRV
- Expansion pressure taken up by
unvented cylinder expansion vessel.
Reduced
pressure to
unvented
cylinder
High
Inlet
Pressure
Reduced
pressure to
shower
cold inlet
Reduced
pressure to
unvented
cylinder
High
Inlet
Pressure
Reduced
pressure to
shower
cold inlet
Expansion
Vessel

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2.5. Pumped showers (inlet pumps) - The shower can be installed with an inlet
pump (twin impeller). The pump MUST be located on the floor next the hot water
cylinder. The hot water cylinder/vent pipes must be arranged as shown to
achieve air separation.
The layout and sizing of pipework MUST be such that nominally equal inlet
supply pressures are achieved AND the effects of other draw-offs are minimized.
90 °
30 to 60 °
Air Separation

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Section
6Installation
ü
ü ü
ü
ü¬
¬
¬
Note! As there is no separate flow control, the regulators provide the most
satisfactory performance. The fitting of the hot regulator is optional and will determine
the strength of the spray from the shower head.
¬
Shower
Control
Flow
Regulator
Compression
Olive
Compression
Nut
Concealing
Plate
System DiagramReference Regulators
Section 5 Hot Cold
Unvented mains pressure 2.4. ü
showers.
Mains pressurised instantaneous 2.3. ü
hot water, heated from thermal
store, showers.
Gas heated showers 2.2.
up to 30kW output.
Gas heated showers 2.2.
above 30kW output.
Gravity fed showers 2.1.
Pumped showers 2.5. Optional
1. General
Read the section Installation
Requirements first.
Important!Twoflowregulators(greyhousing
with black insert) are supplied with this
product. By fitting these in the inlet elbows
of the shower control (see diagram) this
product can be used with high pressure
systems. The regulator is fitted into the inlet
elbow of the shower control. Put the smaller
diameter in first and push until the flange
locates up against the internal shoulder.
Important! If they are to be retro-fitted the
inlet pipe will need to be shortened by the
thickness of the regulator flange to prevent
damage.

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Olive
Horizontal
Arm
Compression
Nut
Rigid Riser
Pipe
Shower Head
Fixing
Screws
Wall Plugs
1.1. The hot water service must always
be connected to the inlet marked
"HOT" in the base of the shower
control body.
1.2. The inlet elbows can be swivelled to
accept rising, falling or back entry
supplies, or any combination of two.
1.3. In choosing the position for the
shower control ensure that the fixed
shower head will be at a suitable
height for the application, and that
there is sufficient vertical distance
between the fixed shower head and
thebase of thecoldcistern toproduce
an acceptable shower.
1.4. Flush the incoming hot and cold
water supplies before connection of
the shower control .
1.5. Usethe 2.5mm A/Fhexagon wrench
(supplied) to loosen the grubscrew
and separate the backplate from the
shower control.
1.6. Fix the backplate to the wall with the
supplied fittings if appropriate.
1.7. Fit the shower control to the
backplate, align the shower control
body as necessary and tighten
grubscrew.
1.8. Connect the hot and cold water
supplies to the shower control 15mm
compression fittings.
Note! Care must be taken when
tightening compression nuts so that
you do not damage the plated
surfaces.
Wall Plug
Backplate
Concealing
Plate
Compression
Nut
Olive
Rigid Riser
Pipe
Shower
Control
Grub
Screw
Fixing
Screw

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1.9. Temporarily fit the rigid riser pipe
and horizontal arm and wall bracket
to the shower control outlet and
mark the position of the wall bracket.
Use a spirit level to ensure the pipe
is vertical.
Note that the horizontal arm can be
shortened if required. De-burr the
pipe ends before making the final
connection.
1.10. Fix the wall bracket, rigid riser pipe
and hand-tighten the three
compression fittings on the shower
control outlet and horizontal arm.
Apply a further 3/4 to 1 1/4 turns to
each compression nut, with a
spanner, to effect a seal.
Note! Care must be taken when
tightening compression nuts so that
you do not damage the plated
surfaces.
1.11. Thoroughly flush the outlet pipework
before connecting the shower head.
Slide the compression nut over the
horizontal arm and make the
connection to the shower head.

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Section Commissioning
7
1. Maximum temperature setting
This thermostatic shower control has been fully performance tested and the maximum
temperature has been pre-set to approximately 42°C under ideal installation conditions
at the factory. Site conditions and personal preference may dictate that the maximum
temperature has to be reset.
To reset the maximum temperature ensure that an adequate supply of hot water is
available at a temperature at least 10°C in excess of that required from the shower
control. Turn the lever fully anti-clockwise then check the temperature at the discharge
point, (allowing sufficient time for hot water to reach the hot inlet of the shower control).
If the temperature is correct, turn the lever fully clockwise to the off position as no
further adjustment is necessary.
If the maximum temperature achieved at the discharge point is unsatisfactory then
adjust the maximum temperature as follows:-
1.1. Before making any adjustments
ensure that upon installation the
correct flow regulators have been
fitted. Refer to the section
Installation.
1.2. Turn the lever fully anti-clockwise
to the hot position.
1.3. Carefully unscrew the grub screw
cover and remove.
1.4. Usethe 2.5mm A/Fhexagon wrench
(supplied) to loosen the grubscrew.
1.5. Remove the lever housing from the
hexagon spindle.
Grub
Screw
Lever
Hexagon
Spindle
Lever
Grub
Screw
Cover

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1.6. Locate the 2.5 mm A/F hexagon
wrench (supplied) in the grub
screw.
1.7. Adjust as follows:
Warmer - Turn anti-clockwise
Cooler - Turn clockwise.
1.8. Refit the lever assembly in
reverse order and turn the
shower control off.
Cooler
Warmer

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Section
8Operation
1. Realm
This thermostatic shower control has a single sequential lever. The shower control is
turned on by turning the control lever anti-clockwise. The shower control is turned off
by turning the control lever clockwise. When the control lever is turned on (anti-
clockwise) the sequence is:
Cold water àWarm water àPre-set maximum temperature.
A fuller description is as follows:-
Initial anti-clockwise movement turns the water on at full flow of cold water, further
anti-clockwise movement increases the temperature. The flow rate is determined by
the supply pressures at the inlets of the shower control, or by the effective output power
of the heater appliance. Flow rates for gas water heaters and
combination boilers can
vary typically between 8 L/min (winter) and 15 L/min (summer).
WARNING!
For safety reasons this product incorporates a maximum temperature setting. This
setting must be checked and adjusted as necessary to suit both site conditions and
user’s comfort. Refer to the section Commissioning:" Maximum temperature
setting" for further details.

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Section Maintenance
9
Malfunction Cause Remedy
Incorrect Insufficient hot water. Check temperature setting
temperature at of hot water system
outlet. shower control.
(60 °C - 65 °C)
Flow regulators fitted Refer to installation
incorrectly. selection chart and check
shower control.
Maximum temperature Refer to Commissioning:
incorrectly set. "Maximum temperature
setting" and action.
If it is not possible to set Refer to installation
maximum temperature, selection chart and
flow regulators may be check shower control.
incorrectly fitted.
1. Fault diagnosis
Read the section "Important Safety Information" first.
Providing the shower control 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. Before
replacing any parts ensure that the underlying cause of the malfunction has been
resolved.
Shower controls are mechanical devices and should be serviced annually depending
on the water conditions. Areas of the country which are affected by hard water should
consider shorter service intervals.
When installed in very hard water areas (above 200 p.p.m. temporary hardness) your
installer may advise the installation of a water treatment device to reduce the effects
of limescale formation.
You may, if you wish, choose to engage the services of a Mira Service Engineer or
Agent, the terms of which are outlined on the back page of this guide.

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2. Cleaning
Many household cleaners contain abrasives and chemical substances, and should not
be used for cleaning plated or plastic fittings. These finishes should be cleaned with
Malfunction Cause Remedy
Flow of water too Flow regulators fitted Refer to installation
fast. incorrectly or not selection chart and check
fitted. shower control.
Very low flow of Flow regulators fitted Refer to installation
water. when not required. selection chart and check
shower control.
Isolating valves not Open isolating valves.
fully open.
Airlock or partially Flush system and if
blocked pipework. appropriate fit float type
automatic air vent.
Blocked shower head. Remove and clean.
Outlet temperature Hot and cold supplies Check connections and
either too hot or all have been connected if necessary remove shower
cold when turned in reverse. control and turn over and
fully on. change outlet fitting and
blanking plug.
Shower control Pipework not flushed Clean shower control and if
cannot be shut off. before connecting the if necessary fit new seals.
shower control. Refer to the section Spare
Parts.
Blend temperature Spray plate in shower Descale.
unstable. head blocked.
Flow regulators fitted Refer to installation selection
incorrectly. chart and check shower
control.
Isolating valve partially Open fully.
closed.