Mira Enduro Operation manual

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THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER
Installation & User Guide
SHOWER PUMP

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INDEX
IMPORTANT SAFETY INFORMATION 3
INTRODUCTION 5
DESCRIPTION 5
OPERATION 6
PACK CONTENTS 6
DIMENSIONS 7
SPECIFICATIONS
Weight 8
Ambient Temperature 8
Electrical 8
Water 8
Standards and Approvals 8
Plumbing Connections 9
INSTALLATION
General 10
Procedure 11
COMMISSIONING 16
FAULT DIAGNOSIS 17
MAINTENANCE
General 20
Storage 20
DECLARATION OF CONFORMITY 21
SPARE PARTS
Spare Parts List 22
Spare Parts Diagram 23
CUSTOMER CARE Back Cover

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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.
1.2. THIS APPLIANCE MUST BE EARTHED. ENSURE SUPPLEMENTARY
BONDING COMPLIES WITH THE "REQUIREMENTS FOR ELECTRICAL
INSTALLATIONS".
In accordance with the current edition of ‘The Plugs and Sockets (Safety)
Regulations' in force at the time of installation, this Mira Enduro is intended to be
permanently connected to the fixed electrical wiring of the mains system.
1.3. The Mira Enduro must not be fitted where it may be exposed to freezing
conditions. Make sure that any pipework that could become frozen is properly
insulated.
1.4. DO NOT operate the Mira Enduro if it is frozen. Allow the Mira Enduro to thaw
before using again.
1.5. DO NOT operate the Mira Enduro if water leaks from the unit, maintenance will
be required before the Mira Enduro can be safely used.
1.6. DO NOT allow the Mira Enduro to be run dry.
1.7. DO NOT run the pump without the guards and covers correctly fitted.
1.8. The flow of air around the motor must be dust free and unimpeded as the pump
motor is air cooled.
1.9. The inclusion of a Residual Current Device (RCD) (Earth trip) with a trip current
of 30mA is recommended. This may already be part of the consumer unit.
1.10.There are no user serviceable components beneath the cover of the Mira Enduro.
Only a competent tradesperson should remove the cover.
1.11.If any of the following conditions occur, isolate the electricity and water supplies
and refer to “Consumer Care”, on the back page of this guide.
1.11.1. If the guards and covers are not correctly fitted and water has entered.
1.11.2. If the guards or covers are damaged.
1.11.3. If the Mira Enduro begins to make an odd noise, smell or smoke.
1.11.4. If the Mira Enduro shows signs of a distinct change in performance,
indicating a need for maintenance.
1.11.5. If the Mira Enduro is frozen.
1.12.Turn off the electrical and water supplies before removing guards or covers. The
electricity must be turned off at the mains and the appropriate circuit fuse
removed, if applicable.
IMPORTANT SAFETY INFORMATION

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1.13.Mains connections are exposed when the guards and covers are removed.
1.14.Moving parts are exposed when the guards and covers are removed.
1.15.Refer to the wiring diagram before making any electrical connections.
1.16.Ensure all electrical connections are tight, to prevent overheating.
2. Caution!
2.1.Read all of these instructions and retain this guide for later use.
2.2. Pass on this guide in the event of change of ownership of the installation site.
2.3. Follow all warnings, cautions and instructions contained in this guide.
2.4. Follow all warnings, cautions and instructions contained on or inside the Mira
Enduro.
2.5. The electrical installation must comply with the “Requirements for Electrical
Installations” commonly referred to as the IEE Wiring Regulations, or any
particular regulations and practices specified by the local electricity supply
company, in force at the time of installation. The installation should be carried out
by an electrician or contractor who is registered or is a member of an association
such as:
2.5.1. National Inspection Council for Electrical Installation and Contracting
(NICEIC), throughout the UK.
2.5.2. The Electrical Contractors Association (ECA), England and Wales.
2.5.3. The Electrical Contractors Association of Scotland (ECAS).
2.6. The plumbing installation must comply with Water Supply 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 (IPHE), throughout the UK.
2.6.2. National Association of Plumbing, Heating and Mechanical Services
Contractors (NAPH & MSC), England and Wales.
2.6.3. Scottish and Northern Ireland Plumbing Employers’ Federation (SNIPEF),
Scotland and Northern Ireland.
2.7 System configurations or pump applications other than those shown (see
Figure 3) may cause inefficient or impaired operation of the system, which may
damage the pump unit. If the system configurations shown are not possible,
consult Kohler Mira for advice before commencing installation.
2.8. 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.
2.9. When the Mira Enduro 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.

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INTRODUCTION
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 safe
for future reference.
DESCRIPTION
The Mira Enduro twin impeller regenerative pump is designed to receive a hot and
cold gravity supply and provide a pressurised hot and cold supply to a mixing valve,
refer to Figure 2.
Pump Location
The pump is more effective when pushing water along a pipe rather than pulling.Thus
the pump is best positioned as close to the hot water or blend water source as possible
to reduce cavitation (air bubbles) in the pipes. The greater the static (inlet) water
pressure on the pump the better it will operate (see Fig. 2).Thus positioning a pump at
high level is not advantageous, and may result in inferior performance.
If it is not possible to locate the pump in the preferred area due to site limitations and
it is necessary to position the pump at high level, or in a position above the secondary
tapping that feeds the pump, then there is an increased risk of air locks. This risk
must be eliminated.
Due consideration should be given to the pump position as any noise generated may
be amplified by installation conditions such as reverberant panels, bare floorboards,
etc.
Make sure adequate free ventilation is provided (minimum clearance of 80 mm around
all sides of pump).
The hot water storage temperature should not exceed 60oC. Operation at this
temperature will also reduce the rate of formation of limescale in the system.
The stored hot and cold water volumes should be sufficient for the required duty,
typical flow rates for a shower outlet are 10 l/min. Instantaneous or combination heaters
are not suitable. It is not recommended that other services use the same feed pipework
as the mixer valve or pump unit as operation problems may occur.

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PACK CONTENTS
Examine the contents of the pack and tick the appropriate boxes to familiarise
yourself with the part names and to confirm that all parts are included.
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The pump would normally start automatically when the mixing valve is set to open.
When the flow rate through the outlet pipe is more than 0.5 l/min a magnetic float lifts
and closes the contacts of the flow switch sensor. When this occurs the electrical
circuit to the motor is completed and the pump operates.The opposite action occurs
when the flow stops.
A vertical distance of 100 mm between the water discharge point of the shower outlet
and the base of the cistern would typically achieve the flow rate required. However,
long pipe runs or restrictive terminal fittings will increase the gravity head required to
produce the required flow.
To overcome an initial low flow rate in the outlet pipe it is possible to by-pass the
function of the flow switch by the addition of a momentary action switch connected in
parallel with the flow switch (as shown in figure 8). When the mixing valve is set to on
and the switch operated, the pump will run.The pump will maintain the necessary flow
rate in the outlet pipe and will continue to operate until the mixing valve is set to off.
OPERATION
1 x Mira Enduro Pump 
4 x Flexible Hoses 
4 x Fibre Washer 
Documentation
1 x Installation and User Guide 
1 x Customer Support Brochure 

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All dimensions are nominal and in millimetres
DIMENSIONS
Figure 1
102
166
198
198
130
248
96
153

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SPECIFICATIONS
1. Weight
Mira Enduro Shower Pump = 7.7 kg (Packed)
2. AmbientTemperature
The ambient temperature around the pump must not exceed 40oC.
3. Electrical
3.1. Protection - the motor is fitted with a self-resetting thermal overload trip.
Enclosure protection to IP22 Class F insulation.
3.2. Duty - continuously rated.
3.3. Power Supply - single phase 230 - 240 V, 50 Hz fused supply through
a double pole, switched connection unit fitted with a 5A fuse and with
a minimum of 3mm contact seperation gap between terminals.
3.4. Absorbed Power - approximately 518W at 2.3 amps.
4. Water
4.1. Maximum Hot Water Temperature - 65oC. The use of hot water above
60oC is not recommended as this may lead to an increased risk of cavitation,
(air bubbles) which increases the pump noise generated and can lead to a
reduction in the ultimate service life. It is recommended that the stored
temperature of water should never exceed 65oC. A stored water
temperature of 60oC is considered sufficient to meet all normal requirements
and will minimize the deposition of scale in hard water areas.
4.2. Delivery Rates - See Pump Performance Graph. This is for the pump
with external flow switch only. Terminal fittings and associated pipe work
will reduce this figure.
4.3. Inlet Pressure - Minimum inlet static pressure 0.1 bar must be maintained
at all times. Maximum static inlet pressure 1.4 bar
5. Standards and Approvals
The Mira Enduro complies with all relevant directives for CE marking.

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6. Plumbing Connections
6.1. Inlet and outlet - Kohler Mira recommend only the use of their 22 mm
flexible hoses.
The hose is fitted with plastic push-in connectors on one end, which must only
be connected with the following:
a) 22 mm diameter copper pipe to BS EN 1057-R250 (half hard) - Table 3.
b) 22 mm plastic pipe to BS 7291 part 1 and part 2 (Table 1) or part 3 (Table 1)
plus internal support sleeve.
Note! The internal bore of the plastic pipe must be supported against collapse
with the pipe manufacturers recommended support sleeve (pipe insert).
c) Appropriate plumbing fittings from the John Guest 'speedfit' push-in
plumbing fitting range.
Note! Other manufacturers fittings are not necessarily compatible and may not
provide a water tight connection.
Mira Enduro Shower Pump Performance Graph
20
15
10
5
0
HEAD (Metres)
010 20 30 40 50 60 70
FLOW (l/min)

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INSTALLATION
Plumbing
Installation must be carried out in accordance with these instructions, and must be
conducted by designated, qualified and competent personnel.
1. ATTENTION! Damage is likely to occur to the pump unit if it is allowed to run dry.
A minimum pump inlet head pressure of 1 metre must be ensured at all times.
2. Do not fit a non return valve in suction line (inlet) pipework to the pump.The pump
must be free to vent to the supply tanks at all times.
3. Pressure loss throughout the inlet pipework network must be kept to the minimum
possible to avoid operational difficulties. This will mean the use of shortest
pipe-runs, adequately sized for the maximum flow demand, and with the minimum
of restriction through elbows and fittings. Long pipe-runs should be avoided and
are best reserved for pipework from the pump outlet to shower fittings.
4. Pipework configurations which can allow air locks to form should be avoided. For
inlet pipework, this should be achieved by utilising pipe-runs with a continuous
fall. For outlet pipework, either provide a continuously rising pipe-run, or if an "up
and over" pipe-run is unavoidable, fit a float type automatic air vent at the highest
point as shown in Figure 3 and 4.
5. The pump must be sited as low as possible in relation to the water source and
mounted in a horizontal position with the outlet connection vertically upwards.
The operation of the flow switch will be impaired in any other position.
15 mm Diameter Pipe 22 mm Diameter Pipe
Float Type Automatic
Air Vent (Bottle Valve)
Domestic Hot Water
Shower Handset
Mixing Valve
Servicing Valve
Pressure Accumulator
Pressure Switch
Fixed Shower Head
Check Valve
Float Operated Valve
DHW
Key to symbols used in the system layouts:

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6. The hot feed from the cylinder must be as illustrated in Figure 2. Side entry
cylinder bosses are not recommended. A drop in cylinder water level could
expose a top entry immersion element. Air in water gathers at the edge of the
cylinder, and in the centre, during the heating process, before travelling up the
vent.
7. Water pumps can develop leaks and should, therefore, not be located where
seepage may go undetected or cause damage. The pump must be installed
such that it is accessible for servicing or removal. When servicing or disconnecting,
small amounts of water may drain from the unit and pipework.
8. Care should be taken when using soldering fluxes. Protect the pump from damage
whilst making soldered connections as some fluxes cause damage to plastic
components.
9. It is recommended that inlet and outlet isolation valves (eg. gate valves) are
fitted to permit isolation of the pump for servicing.
System Layout for Mira Enduro Pump
Figure 2
Minimum 1.5 m
with other
simultaneous hot
water services
Cistern
Warning Pipe
(Overflow)
Other Hot Water Services
DHW Pump
30 to 60°
Air Separation Connections
DHW Cylinder
Feed
25 mm
Cold Feed to
Mixing Valve
90°

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System Layout for Mira Enduro Pump
Figure 3
Cistern
DHW Pump
Mixing
Valve
System Layout for Mira Enduro Pump
Figure 4
DHW Pump
Mixing
Valve
Cistern

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10. Care should be taken to ensure that all pipework fittings and connections are
secure. This is particularly important on the pump inlet pipework network, due to
the potential for air to be drawn into the system should suction conditions exist.
11. All connection pipework must be adequately and rigidly supported.
12. The flexible hoses supplied are primarily for vibration isolation, and should be
installed straight. They may be bent to a maximum of 30o, in which case they
must be allowed to form a uniform swept curve, and must not be stressed in any
way by the plumbing configuration.
13. The pump motor is air cooled and it is important that the flow of air is not impeded
around the appliance. Damage to fabrics may occur if allowed to foul the motor
air vents - avoid a position in which the product could become frozen.
14. Do not rigidly secure pump unit to the mounting surface.
15. Install inlet and outlet pipework to meet pump flexible hoses, flush through
pipework fully before connecting to pump, and then complete plumbing
installation.
DHW
Pump
Unsuitable Layout for Mira Enduro Pump
Figure 5
Cistern
Mixing
Valve

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Cistern
Unsuitable Layout for Mira Enduro Pump
Figure 6
Unsuitable Layout for Mira Enduro Pump
Figure 7
Cistern
Pump
DHW
DHW Pump
Mixing
Valve
Mixing
Valve

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Plumbing - push-in connectors
Do not use stainless steel, chrome or nickel plated pipe with the flexible hose
push-in plumbing connections.
Do not introduce solder flux into the joint or surrounding area, as plastics will
be attacked and may fail.
All solder joints should be completed before final connection to push-in
connections, on the flexible hose. Flux residues must be removed.
Do not allow contact with oil or cellulose based paints, paint thinners or
strippers, acid based descalents or aggressive cleaning agents.
1. Make sure that the pipe is free from all score marks and deformities in the area
of the insertion depth and cut the pipe square removing all burrs and sharp edges
to prevent damage to the 'O' seal.
2. Before inserting the pipe into the fitting, mark the insert depth on the wall of the
pipe with a soft pencil at a distance of 33 mm from the end to be inserted (refer
to illustration).
3. Check in the mouth of the fitting that the 'O' seal, nylon washer and collet are in
position (refer to illustration).
Pencil Mark
22 mm Pipe
Insertion Depth
33 mm
4. Push the pipe firmly into the fitting, until the pencil mark is level with the top of
the collet and the pipe stop resistance is felt. Pull on the pipe to make sure that
it is secure and fitted correctly.
5. To release the joint, push the pipe firmly into the fitting, hold the collet down
and gently remove the pipe.
Caution! Be careful when draining any residual water.
Nylon
Washer
Pipe Stop
'O' Seal
Collet
Hose

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Electrical
Before starting work on the electrical installation, ensure that the power supply
is isolated. Cable selection and corresponding fuse size should be chosen in
accordance with the current involved and surrounding conditions.
All electrical installation work should be carried out by a competent person
1. The unit is fitted with 1.3 metres of supply cable. Should this cable be too short,
a suitable length of three-core cable (minimum 0.75mm per core) should be
obtained and connected to the terminal block in the electrical box as shown in
Figure 8. Remove the electrical box cover by unscrewing the four retaining screws.
2. Do not use long cable lengths, as this may cause substantial voltage drop,
poor pump performance, and could also result in motor overload.
POWER SUPPLY
Single Phase 230 VAC / 1PH / 50Hz
Schematic Wiring Diagram
Figure 8
MAIN WINDING
BLUE
BLACK
BROWN
BLUE
BROWN
RED
FLOW SWITCH
REED
FLOW SWITCH
REED
CAPACITOR
THERMOTRIP
START WINDING
GREEN\YELLOW
E
L
N
OPTIONAL ALTERNATIVE
START METHOD
e.g. Momentary Action Switch

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COMMISSIONING
Commissioning must be carried out in accordance with these instructions,
and must be conducted by designated, qualified and competent personnel.
1. Ensure pump is isolated electrically.
2. Ensure that all isolating valves are fully open and pump chamber is flooded.
3. Open an outlet (e.g. shower control). Water should flow from outlet under pressure
of gravity. Leave outlet open for a short period to allow air to be expelled from
system.
ATTENTION! The flow rate must be at least 0.5 l/min for flow switch operation.
4. Close outlet.
5. Switch on power supply to pump. (If pump operates, repeat commissioning
steps 1 - 5, if this fails refer to Fault Diagnosis).
WARNING! The motor casing can become very hot under normal operating
conditions. Care should be taken to ensure that it cannot be touched or covered
during normal operation.
6. Open an outlet and check that pump operates automatically.
7. If pump does not operate repeat commissioning procedure, refer to Fault
Diagnosis.

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FAULT DIAGNOSIS
Symptom Rectification
(a) No power.
1. Pump does
not start.
Cause
1. Check all fuses and RCD. Ensure
power is available at pump terminal
box.
If fuse "blows" repeatedly, refer to
6(b).
(b) No/low flow
through
terminal fittings
(flow switch
needs typically
0.5 l/min).
1. Clean shower heads, ensure flow
controls are operating correctly.
2. Check for air locks.
3. Check for isolating valves not fully
open, other restrictions.
4. Check system has adequate static
head and flow potential (refer to
Operation on page 6) .
5. Flow switch mechanism sticking.
(d) Motor thermal
switch tripped.
1. Allow motor to cool (up to 1 hour).
Refer to 6 (c).
1. (New installation). Check wiring in
electrical boxes (refer Fig. 8).
2. Check continuity of flow-switch reed
(see Note 1 at end of section).
3. Pump impeded internally, refer to
6(b).
2. Pump
operates
momentarily
when not
required.
(a) Flow-switch
operating due
to water
movement in
pipework.
1. Air pocket after pump. Locate and
ensure adequate venting.
2. Air pocket in pump supply (hot)
expanding due to system heating.
Correct pipework layout to eliminate
thermal flow, fit a single check valve
close to and after pump outlet (see
Note 2 at end of section).
(b) Flow-switch
reed/PCB
tripping.
1. Local source of strong electro-
magnetic/radio transmission. Shield
flow-switch reed (tinfoil).
(c) Internal
problem.
Pump has
been in use
and stopped
within short
period

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Symptom Rectification
(a) Water supply
fault.
3. Pumped
flow/
pressure is
initially
adequate,
but reduces
after short
time.
Cause
1. Check that hot and cold storage
volumes are sufficient for demand.
2. Check that all supply strainers
(including mixing valve) are clean.
3. Pipework configuration and/or water
supply conditions are allowing air
induction.
(a) Installation
fault.
1. Vibration from pump body
transmitted through reverberant
material. Check pump position and
pipework securings.
Note! The pump should be free
standing on its rubber feet, and not
screwed down.
2. Fault in supply to pump. Refer to 3.
(b) Pump impeded
internally.
1. Check for debris and/or damage in
impeller housing.
2. Mechanical seal worn/damaged.
Renew.
3. Motor fault. Refer to 5 (d).
4. Pump is
noisy in
operation.
N.B. All
pumps
generate
some noise.
Installation
conditions
may allow
this to be
amplified.
(a) Power supply
fault.
1. Check all fuses and RCD. Ensure
power is available at pump terminal
box.
5. Pump
switches off
while in use.
1. Refer to 3.
1. Allow the motor to cool (up to 1 hour)
2. Check ambient air temperature
around pump does not exceed 40oC.
3. Make sure adequate free ventilation
is provided (minimum clearance of
80 mm around all sides of pump).
4. Pump impeded internally. Refer to
4(b).
(b) Water supply
fault.
(c) Motor thermal
switch tripped.

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Note 1. Flow-switch continuity should be checked with power switched off and one
flow-switch lead disconnected. Use appropriate continuity meter. Correct
operation is open circuit with no flow, and closed circuit with flow.
Note 2. Fitting a check valve is a secondary measure, initially the cause of water
surge should be investigated and rectified. The single check valve should be of
spring-loaded pattern and fitted in discharge pipework. This may increase the mini-
mum head pressure required to operate flow-switch.
Symptom Rectification
Cause
(a) Seal worn/
damaged.
(b) Inlet pressure
above
maximum
permitted
1. If leak is from rear of impeller
housing, at junction with motor
assembly, mechanical seal requires
renewal.
2. If leak is from perimeter of impeller
housing, then housing seals require
renewal.
3. See Specifications on page 8.
6. Leak from
pump
housing.
5. Pump
switches off
while in use
(continued)
(d) Motor fault. 1. If free movement:-
- if motor winding and bearings are
satisfactory, renew capacitor.
- test continuity of motor windings.
If no continuity, short-circuit exists
in windings (non-serviceable
assembly). Renew Mira Enduro
pump.
If no free movement:-
- refer to 4(b).
- probable motor bearing failure (non-
serviceable assembly). Renew Mira
Enduro pump.