Kohler rada Thermotap-3 User manual

11058907-W2-J
Thermotap-3
Important! This Manual is the property of the customer and must be
retained with the product for maintenance and operational purposes.
Product Manual

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1058907-W2-J
CONTENTS
Safety : Warnings ....................................................................................3
Advice.......................................................................................................3
Introduction .............................................................................................4
Description...............................................................................................4
Dimensions ..............................................................................................5
Specication ............................................................................................6
Pressures/Flow Rates ..........................................................................6
Temperatures .......................................................................................7
Connections .........................................................................................7
Installation ...............................................................................................8
General.................................................................................................8
Flow Regulator Removal......................................................................9
Installation ..........................................................................................10
Commissioning ..................................................................................... 11
Exercising the Thermostat.................................................................. 11
Maximum Temperature....................................................................... 11
Flow Shut Off Setting .........................................................................12
Maximum Temperature Setting .......................................................... 13
Operation ...............................................................................................14
Fault Diagnosis......................................................................................15
Maintenance...........................................................................................16
General...............................................................................................16
Maintenance Procedures ...................................................................17
Spare Parts ............................................................................................22
Customer Service.................................................................................. 24
If you experience any difculty with the installation or operation of your new
Thermostatic Mixer, please refer to ‘Fault Diagnosis’, before contacting Kohler
Mira Ltd. Our telephone and fax numbers can be found on the back cover of
this guide.

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The function of this thermostatic mixing tap is to deliver water consistently at a safe
temperature. This requires that:
1. It is installed, commissioned, operated and maintained in accordance with the
recommendations given in this Manual.
2. For Type 3 installations, valves are only to be used for applications covered by
their approved designations, refer to the TMV3 Requirements Manual.
3. Periodic attention is given, as necessary, to maintain the product in good functional
order. Recommended guidelines are given in section: 'Maintenance'.
4. Continued use of this product in conditions outside the specication limits given
in this Manual can present potential risk to users.
SAFETY : WARNINGS
The use of the word ‘failsafe’ to describe the function of a thermostatic mixing valve
is both incorrect and misleading. In keeping with every other mechanism it cannot
be considered as being functionally infallible.
Provided that the thermostatic mixing valve is installed, commissioned, operated
within the specication limits and maintained according to this Manual, the risk of
malfunction, if not eliminated, is considerably reduced.
Malfunction of thermostatic mixing valves is almost always progressive in nature
and will be detected by the use of proper temperature checking and maintenance
routines.
Certain types of system can result in the thermostatic mixing valve having excessive
‘dead-legs’ of pipework. Others allow an auxiliary cold water supply to be added
to the mixed water from the mixing valve. Such systems can disguise the onset of
thermostatic mixing valve malfunction.
Ultimately, the user or attendant must exercise due diligence to make sure that the
delivery of warm water is at a stable, safe temperature. This is particularly important
in such healthcare procedures as supervised bathing of patients unable to respond
immediately to unsafe temperatures.
SAFETY : WARNINGS
ADVICE

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INTRODUCTION
The Rada Thermotap-3 Lever operated sequential mixing tap is specied to meet the
highest standards of safety, comfort and economy as demanded by todays users.
The Rada Thermotap-3 is designed, manufactured and supported in accordance
with accredited BS EN ISO 9001:1994 Quality Systems.
This Manual covers all Rada Thermotap-3 Lever operated sequential valves
manufactured from May 2003.
The sufx ‘3’ indicates that this mixer has been certied for use in UK Healthcare
premises as a Type 3 valve under the BUILDCERT TMV3 scheme. For Healthcare
installation refer to the TMV3 Requirements Manual.
The approved designations for Type 3 Valves are as follows:
Model Designation Code
Rada Thermotap-3 HP-WE, LP-WE
Guarantee
We guarantee this product against any defect in materials or workmanship for a
period of one year from the date of purchase. For terms and conditions refer to the
back cover.
The Rada Thermotap-3 is a lever operated sequential mixing tap for basins
employing a temperature sensor to provide water at safe, constant temperatures
for handwashing.
It is suitable for use with single hole basins with hole sizes of between 26 - 36 mm
diameter.
Models are available with two congurations of inlet:
• Flexible Braided tails
• Rigid Inlet tails
Both types are supplied complete with two xing studs, backplate and two xing
nuts providing secure installation. Included are isolators, checkvalves, strainers
and ow regulators and they can be tted with either a short (100 mm) lever or long
(150 mm) lever, depending on the application.
DESCRIPTION

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DIMENSIONS
All Dimensions and Angles are Approximate.
Ø 26 - 36 mm
Short Lever 100 mm
Long Lever 150 mm
Short Lever 135 mm Long Lever 140 mm
110 mm Max 30 mm
450 mm
180°
(15 mm Compression Fitting/1/2" BSP Male)
Flexible Tails Rigid Tails

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SPECIFICATION
Pressures/Flow Rates
For optimum performance, dynamic supply pressures should be nominally
equal.
Recommended Flow Rate: 4 - 8 litres/minute (with ow regulators tted).
Recommended Minimum Dynamic Supply Pressure: 0.1 bar (0.2 bar
healthcare).
Note! For dynamic supply pressures below 0.4 bar we recommend removal of the
ow regulators to allow increased ow.
Maximum Static Supply Pressure: Flexible Inlet Tails 6 Bar.
Rigid Inlet Tails 10 Bar
Maximum Inlet Pressure Differential: should not exceed 3:1, in favour of either
supply, during ow.
Normal Operating Conditions are considered as:
• inlet dynamic pressures nominally balanced to within 10% of each other
during ow
• a differential of approximately 50°C between the hot and cold inlet temperatures,
and with differentials of 15 - 35°C between the blend setting and either supply
• daily usage of 1-6 hours
• installation and usage environment not subject to extremes of temperature,
unauthorised tampering or wilful abuse.
Other Applications
For information on other specic applications or suitability, refer to Kohler Mira Ltd,
or Local Agent.
Disinfection
In applications where system chemical disinfection is practised, chlorine can be
used (calculated chlorine concentration of 50 mg/l (ppm) maximum in water, per one
hour dwell time, at service interval frequency). Such procedures must be conducted
strictly in accordance with the information supplied with the disinfectant and with all
relevant Guidelines/Approved Codes of Practice. If in any doubt as to the suitability
of chemical solutions, refer to Kohler Mira Ltd, or Local Agent.
Operating Parameters
For Type 3 valves the supply conditions specied in the TMV3 Requirements Manual
take precedence over the operating parameters which follow.

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Temperatures
Optimum performance is obtained when temperature differentials of 20°Cor more
exist between blend and either supply. Blend control accuracy will begin to diminish
at temperature differentials below 10°C.
Blend Temperature Range: between ambient cold and approximately 45°C,
according to hot water supply temperature.
Recommended Minimum Cold Water Supply Temperature: 5°C.
Recommended Maximum Hot Water Supply Temperature: 65°C.
Note! The Thermotap-3 can accept temporary temperature excursions up to 85°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
applications.
Connections
Hot and cold inlet supply connections are via 15 mm compression ttings or 1/2" BSP
male provided on the inlets to the isolating valves. Where exible inlet tails are
chosen, the red hose is connected to the threaded hole on the tap marked with a
RED label adjacent to the hole (nearest to spout).
Flow Rate v Supply Pressure.

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INSTALLATION
General
Installation must be carried out in accordance with these instructions and must
be conducted by designated, qualied and competent personnel.
Before commencing, make sure that the installation conditions comply with the
information given in section: 'Specications'. For Type 3 valves see also Installation
conditions in The TMV3 Requirements Manual.
The installation must comply with the “Water Supply (Water Fittings)
Regulations or Scottish Byelaws” or any particular regulations and practices,
specied by the local water company or water undertakers.
1. Care must be taken during installation to prevent any risk of injury or
damage.
2. The hole in the basin must be a minimum of 26 mm up to a maximum of 36 mm
diameter, with a basin thickness of 30 mm maximum.
3. The Thermotap-3 should be positioned for easy access during use and
maintenance. All routine maintenance procedures can be conducted with the
Thermotap-3 body in place.
4. Inlet pressure tappings which allow measurement of the inlet pressures to
the mixing valve under operating conditions are particularly recommended for
healthcare applications with Type 3 valves.
5. Pipework dead-legs should be kept to a minimum. The overall length from the
hot water circuit to the discharge point should not exceed 5 m.
6. Supply pipework layout should be arranged to minimise the effect of hydraulic
restriction or other outlet usage upon the dynamic pressures at the Thermotap-3
inlets. Recommended minimum supply line pipe diameter is 8 mm.
7. For Dynamic Supply Pressures below 0.4 bar we recommend removal of the
ow regulators to allow increased ow.
8. To eliminate pipe debris it is essential that supply pipes are thoroughly
ushed through before connection to the Thermotap-3.

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Flow Regulator Removal
Checkvalve
Assembly
Flow
Regulator
1. Isolate the hot and cold supplies with
the isolating valves.
2. Disconnect the flexible hoses or
rigid inlet tails as applicable, by
unscrewing the union nuts. Retain
the sealing washer or replace if
necessary.
3. Unscrew the checkvalve housing
from the isolating valve. Remove the
ow regulator using long nose pliers
or a small screwdriver.
4. Reassembly is reverse of the above,
ensure the strainer is clean before
replacing.
Flow Regulator Removal
Note! This procedure is only necessary when the dynamic supply pressure is below
0.4 bar.

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Thermotap-3 Installation
'O' Seal
30 mm
Maximum
Backplate
(Reverse to suit
smaller basin hole)
Fixing Nuts
Rigid Tail
option
Washer
Checkvalve
Assembly
Strainer
Isolating
Valve
Fixing Studs
26 to 36 mm
Diameter
Union Nut
Flexible
Tail option
Installation
1. Screw the xing studs fully into the
Thermotap-3 body.
2. Place the 'O' seal in the groove in
the base of the Thermotap-3 body.
3. Place either rigid or exible inlet
tail through one of the larger holes
in the backplate, orientate the
backplate to suit the hole size in
the basin.
5. Working underneath the basin
offer the inlet tail up through the
hole in the basin.
4. Screw inlet tail (if using exible
type, red coloured hose) into the
Thermotap-3, hole marked with a
RED label (nearest the spout) and
tighten. Position tap on basin.
5. Pull the backplate over the xing
studs.
6. Working underneath the basin,
locate other inlet tail (blue
coloured flexible hose)through
backplate then screw and tighten
into remaining hole in tap, spread
tails apart slightly if necessary to
assist in tting.
7. Make sure that the Thermotap-3
is correctly positioned and screw
the fixing nuts onto the fixing
studs. Tighten the fixing nuts
until the tap is secure. DO NOT
OVERTIGHTEN.
8. Connect the isolating valves
to the supply pipework. Fit the strainer into the isolating valve and screw in
the checkvalve housing. Use a suitable spanner to tighten the checkvalve
assemblies.
9. Locate the sealing washers inside the nuts on the inlet tails and screw onto the
checkvalve assemblies. Please ensure that the inlet tail (red coloured exible
hose) previously connected to hole marked with a RED label is connected to
hot supply. Use a suitable spanner to tighten the union nuts.
10. Restore the water supplies and check all connections are watertight. Refer to
section 'Commissioning'.