In this procedure document we have endeavoured to make the
information as accurate as possible.
We cannot accept any responsibility should it be found that in
any respect the information is inaccurate or incomplete or
becomes so as a result of further developments or otherwise.
This installation guide has been produced for the wall and deck mounted sequential control
mixer. These instructions cover the installation, operation and maintenance. Please read the
enclosed instructions before commencing the installation of this product, please note;
We recommend that the installation is carried out by an approved
installer.
The installation must be carried out strictly in accordance with the Water Supply (Water Fitting)
Regulations 1999 and any local authority regulations.
If in doubt we recommend that you contact WRAS - Water Regulations Advisory Scheme on
Tel: 0333 207 9030, your local water authority - details available on the WRAS website or the
Chartered Institute of Plumbing and Heating Engineers on Tel: 01708 472 791.
All products MUST be re-commissioned to suit site conditions to ensure optimum performance
levels of the product are obtained.
Check Content
Before commencing remove all components from packaging and check each component with
the contents list.
Ensure all parts are present, before discarding any packaging. If any parts are missing, do not
attempt to install your control mixer until the missing parts have been obtained.
This Inta thermostatic mixer is suitable for installations on all types of plumbing systems, including
gravity supplies, fully pumped, modulating combination boiler, unvented water heater and
unbalanced supplies i.e. Cold Mains & Tank Fed Hot.
Max Dynamic Pressure 5 bar Min Operating Pressure 1.0 bar
Max Static Pressure 12 bar Min Inlet Temperature 10˚C
Max Inlet Temperature 85˚C Temperature Stability ±2˚C
Pre Set Factory Temp Setting 41˚C Min Temp Differential to
Max Unbalanced Pressure Ratio ensure fail-safe between hot
Without Flow Regulator 5:1 and cold supplies 10˚C
Preparation for Installation
Before starting the installation, ensure that the site conditions are suitable - see Technical Data.
The tap is supplied for wall or deck mounting as shown.
Flush the water supply pipes thoroughly prior to installation - see page 13. Do not allow debris,
PTFE tape or any metal particles to enter the mixer.
• The tap is supplied as shown in the Components section except that the thermostatic cartridge
(2) and swivel nut connectors (9) are fitted into the body.
• Fit the concealing plates (5) onto the tailpieces (6) & (7).
• Screw the tailpiece (6) into the cold water inlet of
the tap, right hand side when facing the tap.
ATTENTION: The hot water inlet connection tail
can be identified by the brass insulator pipe that
protrudes past the connecting thread.
Care must be taken to ensure the Hot Water Inlet
Tail Assembly is connected securely into the hot
water inlet of the tap body.
• Screw the tailpiece (7) into the hot water inlet of
the tap, left hand side when facing the tap.
• For wall mounting fit the tap assembly to the
mounting panel, using the back nuts (15) and slide
the concealing plates to the panel.
• Care should be taken that the maximum panel thickness does not exceed 33mm..
• Connect the supply pipes to the tap, cold on the right, hot on the left.
• Fit the lever (3) to the tap using the grub screw (4) provided.
• Please ensure that the hydraulic installation is completed and that all check valves are open.
Deck Mounting
• Screw the tailpiece (6) into the cold water inlet of the tap, right hand side when facing the
tap.
ATTENTION: The hot water inlet connection tail can be identified by the brass
insulator pipe that protrudes past the connecting thread. Care must be taken to ensure the
Hot Water Inlet Tail Assembly is connected securely into the hot water inlet of the tap
body.
• Screw the tailpiece (7) into the hot water inlet of the tap, left hand side when facing the tap.
• For deck mounting fit the tap assembly to the basin, using the washers (16) and back nuts
(15) (supplied) and slide the concealing plates to the basin.
• Connect the supply pipes to the tap, cold on the right, hot on the left.
• Fit the lever (3) to the tap using the grub screw (4) provided.
• Please ensure that the hydraulic installation is completed and that all isolation valves are in
the open position.
As the handle is rotated anti-clockwise from the off position the delivered water progresses from
cold, through warm to the pre-set maximum temperature of approximately 43˚C.
Trouble Shooting
Fault Diagnosis
Mixed water temperature is not hot enough. Ensure the hot water supply is at a constant
temperature above 60˚C.
Re-calibrate as per page 10.
Check for airlocks in the pipework.
The water goes cold during operation. Insufficient stored hot water supply.
Ensure that the boiler is still firing for combi
boilers.
Adjust the boiler control to a minimum setting
of 65˚C not necessarily the best flow rate.
Temperature is too hot or when set to Check the commissioned maximum
hot water runs cold. temperature of the valve. Check connections
to the mixer are not reversed.
Flow of water through the valve is low. Check the filters are clean and supply
pressure is above 1 bar.
No flow of water. Ensure the mixer has not fail-safed,
and check that there is water flow to the mixer
and the service valves are not closed - see
exploded drawing.
The factory setting at 41˚C can be altered to suit site conditions.
Warning: Care must be taken when altering the setting as incorrect calibration can cause injury.
• Remove the grub screw.
• Lift the handle cover off.
• Re-calibrate by removing the temperature stop rings from the cartridge and set the mixed water
to the required temperature by temporarily re-fitting the control lever.
• Once the required temperature is achieved replace the two temperature stop rings on the
splined spindle of the cartridge as shown. These two rings are used to prevent the temperature
of the cartridge from being altered whilst in use. The stop rings should be locked at either end
of the operating cycle and will form a physical stop to prevent the cartridge turning (see
below)
• Refit the lever assembly and grub screw.
• Recheck the calibrated temperature
Cartridge removal
1 Unscrew the retaining screw and remove the lever.
2 The thermostatic cartridge is a single piece construction and should be unscrewed
anti-clockwise from the mixer body using a suitably sized spanner.
3 When re-installing the cartridge into the mixer body, it should be tightened to a maximum
• With all highly polished items, care should be taken not to damage any of the external
surfaces.
• We recommend that to ensure the physical appearance of the product and component parts
that it is periodically cleaned with a soft damp cloth and a mild detergent. The use of abrasive
or solvent cleaners will damage the finish of the product.
• We recommend periodically that the flow straightener is cleaned using a suitable scaling
solvent. Check first it does not affect the plated surface.
• The internal bore of the flow straightener must be periodically wiped using a damp cloth.
• We recommend that this fitting is serviced at least once a year.
• Only use genuine spare parts, the full list is available on request by ringing the Technical
Helpline number on the back page.
Removing Spout
The HTMWMRS wall mounted and HTMDMRS deck mounted taps have a removable spout to
assist with cleaning, disinfection by immersion or sterilisation in an autoclave.
Inta recommend that a replacement spout is available as the tap should not be left without
a spout (HTMSP16XX).
Cleaning, disinfection and sterilisation is only necessary if there is evidence of solid deposits
around the outlet from the tap or a minimum of once per year.
• Ensure the isolation valve in both supplies to the tap are in the closed position and the lever is
also in the closed position to prevent water flow and potential flooding.
• Using a suitably sized Allen key unscrew the grub screw (18) located beneath the spout.
The grub screw must be removed completely to ensure the ‘O’ rings are not damaged when
the spout is pulled away.
• Pull the spout (17) away for the body of the tap, care should be taken to prevent damage to
the chrome finish of the spout.
• Check the condition of the two ‘O’ rings (19) on the spigot of the tap body, if damaged they
must be replaced.
Once the spout has been removed disinfection or sterilisation can commence.
• The spout can be sterilised in an Autoclave following standard sterilisation procedures.
• The spout after disinfection and sterilisation should be stored in such a manner that they will not
become infected or dirty before refitting.
Refitting Spout
• When refitting the spout lubricate the two ‘O’ rings with a suitable lubricant to ease
re-assembly.
• Fit and re-tighten the grub screw (18).
• Open the isolation valve in both supplies to the tap.
• Only use genuine spare parts, the full list is available on request by ringing the Technical
Helpline number on the back page.
Waste water flushed
through outlet with
hose connected
7 - Flushing
(hose not supplied)
90°
OPEN
CLOSE
1 - Move handle to closed position
Water must not pass through
the tap before completing
system flushing
2 - Ensure both isolation valves
are in the closed position
2A - Turn to closed
position
3 - Remove end cover from
the hot supply end of
the tap
1
2
4 - Carefully remove check valve
housing using the extraction
tool (HTMSP20XX) and rotating
anti-clockwise
5 - Screw in connector plug using
suitably sized spanner
6 - Attach hose connector
(HTMFLUSH)
90°
OPEN
CLOSE
6A - Turn to open
position
Hot
supply
pipework
flushed
The water system must be thoroughly flushed before attempting to commission or operate this tap to
ensure all pipework is clean and free from any debris. This system flushing procedure allows the
process to be efficiently conducted with the tap installed. Failure to carry out effective system flushing
before commissioning or operating this product could damage or limit the performance of the
product and invalidate the product guarantee.
IMPORTANT – The following instructions must be read prior to the installation of any Inta
thermostatic mixing valve.
The installer should also be aware of his responsibility and duty of care to ensure that all aspects
of the installation comply with all current regulations and legislations.
It has been brought to our attention that flushing water systems using certain chemicals may affect
the workings of the valve, which may adversely affect its performance.
We recommend that following system flushing with chemicals, mixers are checked for correct
operation.
1. It is essential that, before installing a thermostatic mixing valve, the supply conditions of the
system to which the valve is intended to be fitted are checked to confirm compliance with the
parameters as quoted within the Technical Specification above and conditions on which the
approval is granted i.e. verify supply temperatures, supply pressures, risk assessments etc
2. Consideration must be made for the possibility of multiple/ simultaneous demands being made
on the supply system whilst the thermostatic mixing valve is in use, all practical pre-cautions
must be made to ensure that the valve is not affected. Failure to make provision within the pipe
sizing etc will affect the performance of the valve.
3. The supply system to which the Thermostatic Mixing Valve is to be installed into must be
thoroughly flushed and cleaned to remove any debris (see page 13), which may be
accumulated during the installation. Failure to remove any debris will affect the performance
and the manufacturer’s warranty on the product.
4. Independent filters/check valves and isolation valves must be fitted in conjunction with the
valve. In areas that are subject to hard water, provision must be made to treat the supplies
prior the supplies entering any product.
5. The maximum flow rate of the valve will only be achieved when the supply conditions are
achieved as quoted, with a flow condition under 1 bar differential pressure.
6. This Inta thermostatic mixer has been designed to be wall mounted. It is essential that access to
the valve is not obstructed for future maintenance, that may be required to the valve or
associated fittings.
7. The connection of the hot and cold supplies must be in accordance with the instructions shown
on page 8 i.e. hot water connected to the left hand side of the valve when the nozzle is facing
you.
8. In a situation where one or both of the water supplies are excessive, it is recommended to fit a
Pressure Reducing Valve, WRAS approved product, to reduce the pressure(s) to within those
stated in the Technical Specification previously stated or a suitable flow regulator.
9. We recommend that Y pattern strainers and full bore isolation valves are installed in
conjunction with this product as close as practically possible to the location valve.
10. It is essential that this product should not be installed in situations where there is a possibility of
the valve being deprived of water or where demands for water are greater than the actual
stored supplies.
11. To ensure that the performance levels of this Thermostatic Mixing Valve are maintained (in the
event of cold water failure) the temperature of the hot water supply at the point of entry to the
valve must be a minimum of 10°C above the commissioned mixed water discharge
temperature.
12. This Thermostatic Mixing Valve must not be subject to any extreme temperature variations
either during the installation or under normal operating condition
Commissioning
IMPORTANT – The following instructions must be read and understood prior to the commissioning
of a Thermostatic Mixer. If under any circumstances there are aspects to the installation/system which
do not comply with the specification laid down, the valve MUST NOT is put into operation until the
system/installation complies with our specification.
1. Ensure that the system is thoroughly cleaned and free from any debris prior to the
commissioning of the valve. (See page 10)
2. The commissioning of the temperature must be carried out using a suitably calibrated
thermometer – preferably a digital thermometer. (See page 8)
3. In the absence of other temperatures being specified we recommend that the outlet
temperatures quoted in table 1 are used, extracted from the “National Health Service –
Health Guidance Note – Safe Hot Water and Surface Temperatures”.
Table 1
ApplicationRecommended Set Hot Water Temperature
Wash Hand Basin41˚C
4. Each valve must be commissioned taking into consideration any fluctuations, which may
occur within the system due to simultaneous demands. It is advisable that any outlets which
are connected to the same supply as the mixing valve are opened during setting of the
mixed water temperature. It is advisable to ensure that the water temperatures are
established before any attempt to commission.
5. Once the supply temperatures are stable and the normal operating conditions are
established, the valve can be commissioned. We suggest that the following sequence is
followed when commissioning the valve:
5.1 Using the lever turn to the maximum hot setting of the tap, the mixed water temperature
should be preset (see page 8).
5.2 Measure and record the temperature of the hot and cold water supplies at the
connections to the valve.
5.3 Measure and record the temperature of the water discharging from the valve for the
largest and smallest draw off point.
5.4 Isolate the cold water supply to the valve and monitor the mixed water temperature.
5.5 Measure and record the maximum mixed water temperature and the final temperature.
The final temperature found during the test should not exceed the values quoted in
table 2.
Table 2
ApplicationMaximum Hot Water Temperature
Wash Hand Basin43˚C
5.6 Record all the equipment used during the commissioning.
6. Ensure that the application, to which the valve will be used, is appropriate for the approved
designation.
7. The above information must be recorded and updated on every occasion when any work is
carried out on the valve.
In Service Testing
To ensure that the Thermostatic Mixer maintains a high level of protection, we advise the following in
service testing is followed (the same equipment used to commission the valve initially must be used in
the following tasks).
1. After a period of between 6 and 8 weeks after commissioning carry out the following.
a) Record the temperature of the hot and cold water supplies.
b) Record the temperature of the mixed water at the largest draw off flow rate.
c) Record the temperature of the mixed water at the smallest draw off flow rate.
2. If the mixed water temperature has changed significantly from the previous test results
(e.g. > 1 k), record the change and before re-setting the mixed water temperature check that:
3. If the mixed water temperature is acceptable, carry out the following:
a) Record the temperature of the hot and cold water supplies.
b) Record the temperature of the mixed water at the largest draw off flow rate.
c) Record the temperature of the mixed water at the smallest draw off flow rate.
d) Isolate the cold water supply to the mixing valve and monitor the mixed water
temperature.
e) Record the maximum temperature achieved as a result and the final temperature (the
final temperature should not exceed the values quoted in table 2)
f) Record the equipment used during these tests.
4. If during the test, paragraph 3, the mixed water temperature is greater than the values quoted
in table 2 or the maximum temperature exceeds the corresponding values from previous test
results by more than 2˚C, the tap must be serviced.
5. After a period of between 12 and 15 weeks after commissioning, carry out the sequence of
tests as described in 1, 2, 3 and 4 of this section.
6. Dependant upon the results obtained from the first two series of tests; there are a number of
possible outcomes.
a) If no significant change in the mixed water temperatures (e.g. < 1˚C) is recorded
between commissioning and step 3e above or between commissioning and 5 of this
section, the next in service testing should be carried out at a period of 24 to 28 weeks
after initial commissioning.
b) If a small change (e.g. 1 - 2˚C) in the mixed water temperature is recorded in only one
of these periods, necessitating adjustment of the mixed water temperature, then the next in
service test can be deferred to 24 to 28 weeks after commissioning.
c) If small change (e.g. 1 - 2˚C) in the mixed water temperature is recorded in both of these
periods, necessitating adjustment of the mixed water temperature, then the next in service
test can be deferred to 18 to 21 weeks after commissioning.
d) If significant changes (e.g. >2˚C) in the mixed water temperature are recorded in both
of these periods necessitating service work, then the next in service test should be carried
out at 18 - 21 weeks after commissioning.
7. The general principle to be observed after the first two or three in service tests is that the
intervals of future test should be set to those which previous tests have shown can be achieved
with no more than a small change in mixed water temperature.
8. In all areas periodic maintenance of the valve and associated fittings i.e. strainers, check
valves will ensure optimum performance levels are maintained.
9. On the inlet strainers on both the hot and cold water supply inlet can be removed for cleaning.
10. The built in check valves can be accessed in a similar way to the filters to ensure freedom and
correct seating.
Intatec guarantees the product to be free from defects in materials and workmanship at the date
of purchase. If the product is determined to be defective at the date of original purchase due to
improper materials or workmanship and you inform us of this within the prescribed warranty
period, (five years for showering products, one year for commercial products), of the date of
purchase, Intatec will, without charge for labour or parts, repair or (at the discretion of Intatec)
replace the product or its defective parts subject to the terms and limitations below. Intatec may
replace defective products or parts with new or refurbished products or parts.
Guarantee services will be provided only if the original invoice or sales receipt (indicating the
date of purchase and supplier's name) is presented with the defective product within the
guarantee period.
The free of charge service may be refused if this information is not available. The guarantee will
not apply if the product has not been installed correctly.
This guarantee does not cover (without limitation):
• Periodic maintenance or parts replacement due to wear and tear;
• Damage or defects caused by misuse in operation;
• Installation or use of the product inconsistent with good working practice;
• Failure to maintain the product in accordance with instructions;
• Repair or attempted repair by persons who are not qualified;
• Neglect
Consumers have legal (statutory) rights under applicable laws relating to the sale of consumer
products. This guarantee does not affect statutory rights you may have or those rights that cannot
be excluded or limited, nor rights against the person from whom you purchased the product. You
may assert any rights you have at your sole discretion.