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.

31058907-W2-J
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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1058907-W2-J
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

51058907-W2-J
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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1058907-W2-J
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.

91058907-W2-J
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'.

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COMMISSIONING
Commissioning must be carried out in accordance with these instructions, and must
be conducted by designated, qualied and competent personnel.
Exercising the Thermostat
Thermostatic mixing valves are inclined to lose their responsiveness if not used.
Valves which have been in storage, installed but not commissioned, or simply not
used for some time should be exercised before setting the maximum temperature
or carrying out any tests.
A simple way to provide this exercise is:
1. Make sure that hot and cold water is available at the valve inlets, and the outlet
is open.
2. Move the temperature control rapidly from cold to hot and hot back to cold
several times, pausing at each extreme.
Maximum Temperature
The maximum blend temperature obtainable by the user should be limited, to prevent
accidental selection of a temperature that is too hot.
Note! For Type 3 valves in healthcare installations the maximum blend temperature
is determined by the application, refer to the TMV3 Requirements Manual.
The Rada Thermotap-3 is fully performance tested, and the maximum temperature
is preset to approximately 41°C under ideal installation conditions at the factory.
Site conditions and personal preference may dictate that the maximum temperature
has to be reset following installation.
This product includes an adjustable stop ring which limits the rotation of the lever
control. The stop ring and lever will need to be assembled correctly to make sure
that the ow shuts off and the maximum temperature limit is set.
If the tap has been dismantled for servicing of the internal parts, or the lever
removed for any reason, refer to sections: 'Flow Shut Off Setting' and 'Maximum
Temperature Setting'.

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1058907-W2-J
Flow Shut Off Setting
1. Fully open the inlet isolation valves.
2. Remove the lever using the 2.5 mm A/F hexagonal wrench, and remove the
stop ring.
3. Ret the lever to the spindle (position not important) and open the tap.
4. Turn the lever to the off position so the ow just stops, then rotate a further
10 - 20 degrees, to make sure of a tight shut off.
5. Remove the lever and ret the stop ring with the arrow aligned with the tap
spout (refer to illustration).
6. Fit the lever to the spindle in the OFF position (parallel to the wall) and make
sure that the lever engages with the stop, i.e. cannot be turned clockwise (refer
to illustration).
Lever in Stop PositionStop Ring Alignment
Stop Ring

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Lever at Maximum Temperature
Position
Maximum Blend Temperature
Setting
- +
Maximum Temperature Setting
Make sure that an adequate supply of hot water is available at the hot inlet of the
Thermotap-3.
The minimum temperature of the hot water must be at least 10°C above the desired
blend, however during resetting this should be close to the typical storage maximum
to offset the possibility of any blend shift due to uctuating supply temperatures.
Make sure that both inlet isolating valves are fully open.
Temperatures should always be measured using a thermometer with proven
accuracy.
1. Turn the lever 1/2 turn anticlockwise
until it engages the maximum
temperature stop (Refer to
illustration).
2. Let the water run until the temperature
stabilizes.
3. Check the water temperature, which
is factory preset to 41°C.
4. If the maximum temperature requires
adjustment, remove the lever taking
care not to turn the spindle.
5. Insert the 2.5 mm A/F hexagonal
wrench (supplied) to engage the
grub screw in the centre of the head
assembly (Refer to illustration).
6. Rotate the grub screw as necessary
until the required maximum blend
temperature is achieved. Rotate
the grub screw anticlockwise
to increase the temperature
or clockwise to decrease the
temperature.
7. Ret the lever in the same position
and check the operation i.e. full
shut off is achieved and maximum
temperature is correct.
8. Move the lever to the off position.
9. Use the 2.5 mm A/F hexagonal
wrench to secure the lever to the
spindle.
10. Fit blanking plug to lever.

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1058907-W2-J
The Rada Thermotap-3 has a single lever that provides sequential operation from
OFF through COLD and WARM to a preset maximum blend temperature. The
maximum temperature is preset to approximately 41°C under ideal installation
conditions at the factory. To change this setting refer to the information given in
section: Commissioning'.
OPERATION
Principle of Operation
Off
Warm
Cold
Preset
Maximum Blend
Temperature

15 1058907-W2-J
FAULT DIAGNOSIS
Symptom Cause/Rectication
1. Only hot or
cold water
from outlet.
a. Inlet supplies reversed (hot supply to cold inlet).
Check.
b. No hot water reaching Thermotap-3. Check.
c. Check strainers and inlet/outlet ttings for blockage.
d. Refer symptom 5. below.
e. Installation conditions continuously outside operating
parameters: refer to section: 'Specications', and 2.e.
below.
2. Fluctuating
or reduced
ow rate.
Normal function of thermostatic control when operating
conditions are unsatisfactory;
a. Check strainers and inlet/outlet fittings for flow
restriction.
b. Make sure that minimum ow rate is sufcient for supply
conditions, refer to symptom 9.b. below.
c. Make sure that dynamic inlet pressures are nominally
balanced and sufcient.
d. Make sure that inlet temperature differentials are
sufcient.
e. (Subsequent to rectication of supply conditions) Check
thermostatic performance; renew shuttle/thermostat
assembly if necessary.
3. No ow from
outlet.
a. Check strainers and inlet/outlet ttings for blockage.
b. Hot or cold supply failure; thermostat holding correct
shutdown function: rectify, and refer to symptom 2.e.
above.
c. Circlip disengaged from head assembly, Check.
4. Blend
temperature
drift.
Indicates operating conditions changed.
a. Refer to symptom 2. above.
b. Hot supply temperature uctuation.
c. Supply pressure uctuation.
d. Seal(s) damage or wear. Renew internal 'O' seals.
5. Hot water in
cold supply or
vice versa.
Indicates checkvalves require maintenance, refer to
MAINTENANCE.

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1058907-W2-J
Symptom Cause/Rectication
6. Maximum
blend
temperature
setting too
hot or too
cool.
a. Indicates incorrect maximum temperature setting; refer
to COMMISSIONING.
b. As symptom 4. above.
c. As symptom 5. above.
7. Water leaking
from body.
a. Seal(s) worn or damaged. Obtain service pack (936 23),
and renew all seals.
b. If leak persists from around spindle renew head
assembly.
8. Flow does
not cease
fully when
lever is in off
position.
a. Check flow shut off setting - see Commissioning
Section.
b. Hot seat damaged; obtain service pack and renew.
Cold seat 'O' seal can not be renewed; replace Head
Assembly.
c. Shuttle/thermostat assembly damaged; renew.
d. Head assembly worn; renew seals or head assembly.
9. Flow rate too
high or too
low.
a. Too low, Refer symptom 2.a-e. above.
b. Too low, Supply pressure low, make sure ow regulators
are not tted.
c. Too high, Supply pressure high, make sure regulators
are tted.
d. Hot & cold ows differ, Refer to symptom 2.a-e. above.
General
1. The maintenance of this product must be carried out in accordance with
instructions given in this manual, and must be conducted by designated,
qualied and competent personnel.
2. Rada products are precision-engineered and should give continued superior
and safe performance, provided:
• They are installed, commissioned, operated and maintained in accordance
with the recommendations stated in this product manual.
• Periodic attention is given as necessary to maintain the product in good
functional order, refer to section: 'Planned Maintenance'.
MAINTENANCE

17 1058907-W2-J
Service Contracts
To ensure your Rada/Mira products function correctly and give continued safe
performance Service Contracts can be undertaken (subject to site survey).
All Service Contract work is carried out by fully trained Rada/Mira Service Engineers
who carry a comprehensive range of genuine spare parts. For details on arranging
a Service Contract please contact Aftersales/Service.
Lubricants
Important! If you need to lubricate the seals, use only a small amount of silicone-only
based lubricants on this product. Do not use oil-based or other lubricant types as these
may cause rapid deterioration of seals, (grease sachet is included in 'Service Pack').
Planned Maintenance
Important! For Type 3 Valves use the In-Service Tests given in the TMV3
Requirements Manual. In the absence of any other instruction or guidance on the
means of determining the appropriate frequency of in-service testing, the procedure
contained within this guide (taken from Annex F of D08) should be used.
For other commercial installations it is recommended that the correct blend setting
is checked every 6 months and that the In-Service Test procedure is followed every
12 months.
Maintenance Procedures
The Thermotap-3 is designed for minimal maintenance under conditions of normal
use. External surfaces may be wiped clean with a soft cloth, and if necessary, a mild
washing-up type detergent or soap solution can be used.
Warning: many household and industrial cleaning products contain mild abrasives
and chemical concentrates, and should not be used on polished, chromed or plastic
surfaces.
Should an internal malfunction occur then this will probably require component
renewal. Components are precision-made, so care must be taken while servicing
to avoid damage.
When ordering spare parts, please state product type, i.e. Rada Thermotap-3 and
identify part name and number. A service pack is available, containing all the seals
and strainer screens that may be necessary for renewal during maintenance or
servicing. Refer to the section: 'Spare Parts'.
If for any reason the tap cannot be fully shut off, it may be necessary to readjust the
lever shut off position. Refer to Lever Shut Off Position.

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1058907-W2-J
Internal Mechanism - Disassembly/Assembly
Hot Inlet
'O' Seal (Rising
Spindle)
Cold Inlet
Hot Seat
'O' Seal
(Separator)
Plug
Grubscrew
Stop Ring
Collar
Circlip
Head
Screw
'O' Seal (Head)
Thrust Washer

Non-rising Spindle

'O' Seal (Non-rising
Spindle)


Rising Spindle 

'O' Seal
(Follower)

Follower
Shuttle/Thermostat
Assembly (Includes
Overload Spring)
Grub Screw
Internal Seal Location
Applied recommended lubricants for dynamic
seals/components - Refer to Lubricants


Return Spring
Retainer
'O' Seal
(Separator)

Hot Seat
Thermotap 3 Body
'O' Seal (Cold
Seat) 
Note! Do not clean grease from spindle threads. This is a
special lubricant designed to work for the life of the product.

19 1058907-W2-J
Lever Shut Off Position
1. Turn the lever fully to the off position. Remove plug and slacken the grub screw
which secures the lever, and remove the lever.
2. Refit the lever to the spindle one serration anticlockwise (approx 10
degrees).
3. Turn the lever fully clockwise to the stop (lever should be parallel with the wall)
and ensure that tight shut off is achieved.
4. If tap continues to drip repeat the above procedure, adjusting the lever one
further serration.
5. After adjusting the lever position it may be necessary to adjust the maximum
temperature stop. Refer to section: 'Commissioning'.
6. If tap continues to drip, replace the internal seals. Refer to Maintenance
Procedure - Internal Mechanism.
Maintenance Procedure - Internal Mechanism
Removal
1. Isolate the hot and cold supplies, and move the lever to its mid position to
release any pressure.
2. Remove the plug in the side of the lever and use a 2.5 mm A/F hexagonal
wrench to loosen the grub screw. Remove the lever.
3. Pull the collar and stop ring off the head assembly.
4. Use a suitable spanner to remove the head assembly.
5. Remove the circlip and screw from the head assembly.
6. Push the rising and non-rising spindles out of the head.
7. Insert the 2.5 mm A/F hexagonal wrench into the grub screw in the centre of
the rising spindle.
8. Rotate the grub screw clockwise until it pushes the follower out of the rising
spindle. Remove the thrust washer.
9. DO NOT unscrew the rising and non-rising spindles from each other, or remove
the 'black' grease as these are 'greased for life' during manufacture.
10. Carefully remove the 'O' seals from the head, the non-rising spindle, the rising
spindle and the follower. Do not remove the 'O' seal in the bottom face of the
rising spindle at this stage (refer to paragraph 15). This 'O' seal forms the cold
seat for the Thermotap-3 and the groove is swaged to hold it in position.
11. Withdraw the shuttle/thermostat assembly, complete with return spring, from
the Thermotap-3 body. Do not disassemble the shuttle/thermostat assembly.
12. Carefully remove the retainer, the separator 'O' seal and the hot seat from the
Thermotap-3 body. Take care not to damage the seal grooves.

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1058907-W2-J
Cleaning/Renewal of Parts
13. Internal parts can be cleaned using a mild proprietary inhibited scale solvent,
e.g. domestic kettle descalent. After descaling, always rinse parts thoroughly
in clean water before retting.
Note! Make sure that components are cleaned carefully and not damaged in
any way. Do not use any abrasive material on component surfaces.
14. Inspect the shuttle/thermostat assembly for signs of damage or leakage; renew
the assembly if in any doubt of the condition. Check the overload spring in the
shuttle/thermostat assembly for free movement by compressing it several times;
renew the assembly if the components are sticking.
Note! The shuttle/thermostat cannot be tested individually, its condition
can only be assessed as part of the performance check; refer to section:
'Commissioning'.
15. Examine all seals (particularly the separator 'O' seal, the cold seat 'O' seal and
the hot seat) for signs of wear or deformation.
16. Install the new seals as necessary, taking care not to damage the seal grooves.
A service pack is available, containing all the seals and strainer screens that
may be necessary for renewal during maintenance or servicing. Refer to section:
Spare Parts'.
17. Lightly coat all seals with a silicone-only based lubricant (included in
the Service Pack) to assist re-assembly. Refer to section: 'Maintenance,
Lubricants'.
Re-assembly
18. Use the 2.5 mm A/F hexagonal wrench to screw the grub screw into the rising
spindle.
19. Insert the follower, complete with 'O' seal, into the rising spindle. The larger
diameter seal-end must be inserted rst.
20. Place the thrust washer on the non-rising spindle.
21. Align the slot in the rising spindle with the screw hole in the head, and push
the spindles, complete with 'O' seals, fully into the head.
22. Check the alignment and install the screw. Tighten the screw.
23. Fit the circlip.
24. Make sure that the separator 'O' seal (blue) and the hot seat are tted to the
Thermotap-3 body correctly, and install the retainer. Grease the 'O' seal.
25. Locate the spring on the retainer, and install the shuttle/thermostat assembly.
26. Carefully screw the head assembly, complete with 'O' seal into the Thermotap-3
body. Use a suitable spanner to tighten the head assembly fully.
27. Fit the collar and stop ring with the arrow aligned with the spout.
28. Refer to section: 'Commissioning' for resetting the ow shut-off and maximum
temperature.