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IMPORTANTInstaller: This Manual is the property of the customer and

must be retained with the product formaintenance and operational purposes.

PRODUCT MANUAL

TF2020 and TF2020SRada-Presto

2

INDEXPage

INTRODUCTION 3

DESCRIPTION 3

SAFETY:WARNINGS 3

PACK CONTENTS 4

DIMENSIONS 5

SPECIFICATION 6

INSTALLATION 8

COMMISSIONING 9

OPERATION 14

FAULT DIAGNOSIS 15

MAINTENANCE 16

SPARE PARTS 23

ACCESSORIES 25

CUSTOMER CARE Back Cover

3

INTRODUCTION

The taps are vandal-proof 1/2" push action mixer taps suitable for washbasin installation.They incorporate an automatic time delayed shut-off, self cleaning mechanism andinternal components manufactured from anti-corrosion and anti-liming materials.

The TF2020S model incorporates a security "S" cartridge to prevent continuousflow should the push-button be deliberately held down.

Product range

DESCRIPTION

Rada-Presto taps are specified to meet the highest standards of safety, comfortand economy as demanded by today’s users. All Rada products are designed,manufactured and supported in accordance with accredited BS EN ISO 9001:1994Quality Systems.

Rada-Presto TF2020 chrome 1/2" for individual washbasin installation, suppliedwith seat joint, sealing washer, joint and stainless steel flexible couplings with 1/2"rotating nuts. The tap body and push-button are chrome plated brass. A grey skirtindicates mixed water supplies.

SAFETY: WARNINGS

Rada products are precision-engineered and should give continued superior and safeperformance, provided:

1. They are installed, commissioned, operated and maintained in accordance withthe recommendations given in this Manual

2. Periodic attention is given, as necessary, to maintain the product in good functionalorder. Recommended guidelines are given in the MAINTENANCE section.

Provided it is installed, commissioned, operated and maintained within theserecommendations, the risk of failure, if not eliminated, is reduced to the minimumachievable.

Rada-Presto TF2020S chrome 1/2" for individual washbasin installation andincorporating the security "S" cartridge is supplied with seat joint, sealing washer,joint and stainless steel flexible couplings with 1/2" rotating nuts. The tap body andpush-button are chrome plated brass. A grey skirt indicates mixed water supplies.

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PACK CONTENTS

Tick the appropriate boxes to familiarize yourself with the part names and toconfirm that the parts are included.

TF2020 and TF2020S

1 x Product Manual

2 x Strainer Seals

1 x TF2020 or

TF2020S

3 x Stop Pins

1 x Sealing Washer

1 x Joint Seal

1 x Joint

1 x Fixing Nut

Note: Two are already installed intemperature adjustment lever.

2 x 1/2” Adaptor

2 x Compression/

flat-face adaptors

2 x Plastic Washer

5

DIMENSIONS

126

TF2020 and TF2020S

66

127

NOTE:- NOT TO SCALE - All dimensions are in millimetres

23°

6

SPECIFICATION

Recommended Minimum Running Pressure: 0.15 bar (with regulator removed).

Recommended Maximum Static Pressure: 10 bar.

Time cycle: Preset to approximately 10 seconds, subject to site conditions(Low water pressures may reduce this time period. High water pressure may increasethis time period).

Time duration may be increased in six graduated steps to approximately16 seconds (See COMMISSIONING)

Normal Operating Conditions are considered as:

- inlet dynamic pressures nominally balanced to within 10% of each other duringflow.- a differential of approximately 50oC between the hot and cold inlet temperatures,and with differentials of 15-35oC 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 ApplicationsFor information on other specific applications or suitability, refer to Kohler Mira Ltd, orLocal Agent.

DisinfectionIn applications where system chemical disinfection is practised, chlorine can be used(calculated chlorine concentration of 50 mg/l (ppm) maximum in water, per one hourdwell time, at service interval frequency). Such procedures must be conducted strictlyin accordance with the information supplied with the disinfectant and with all relevantGuidelines/Approved Codes of Practice.If in any doubt as to the suitability of chemical solutions, refer to Kohler Mira Ltd, orLocal Agent.

Pressures and Flow RatesFor optimum performance, dynamic supply pressures should be nominallyequal.

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TF2020 and TF2020SHigh Pressure

Connections:Inlet supply connections are made via 2 x 1/2" BSP female nuts at the end offlexible inlet tails.

Flow rates: For conservation of energy and water, an economical flowrate may be obtained by setting the internal flow adjusterto one of five positions. The graph shows the flow rates foreach of the five positions for all models. All taps are fittedwith a flow straightener and are supplied adjusted to positionS4.

Note: An optional flow regulator (4 litres/min.) is alsoavailable as a spare.

Flow Curves

Running Pressure (bar)

Low Pressure

TF2020 and TF2020S

0 0.5 1 1.5 2

2.5

0

5

7.5

10

12.5 S5

S3

S2S1

S4FlowRate

(l/min)

FlowRate

(l/min)

0 1 2 3 4 5 6

S5S4

S3

S2

S1

0

5

10

15

20

Running Pressure (bar)

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INSTALLATION

Fit to Basin

Important! Flush supplypipework thoroughly beforeconnection.

1. Remove retaining nut, pipe clampand rubber gasket from mixer tap.

2. Connect flexible tail connectors.Make sure O-rings are fittedcorrectly.

3. Fit tap to basin. Make sure basinsealing ring is concentric with themixer tap body.

4. Fit rubber gasket and pipe clamp.Screw on retaining nut.

5. Connect the flexible tail connectorsto the 1/2” Adaptor (Make sure theplastic washers are in place).Note! Check valves are located inthe flex tails.

6. Fit the strainers seals supplied tothe checkvalve assemblies.

7. Fit 15mm compression isolatingvalves (not supplied) using the flat-face adaptors supplied.

8. Refer to COMMISSIONING beforeoperating the mixer tap.

Tap Body

Basin

RubberGasket

Pipe Clamp

Retaining NutO-rings

Flexible TailConnectors

Flexible tailconnector

Plastic washer

1/2" Adaptor

Strainer Seal

Flat-faceadaptor

15mmcompressionisolatingvalve(not supplied)

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COMMISSIONINGCommissioning must be carried out in accordance with these instructions,and must be conducted by designated, qualified and competent personnel.

Commissioning Checks1. Turn on water supplies to the tap.

2. Operate the tap (see section OPERATION) and check:

- Flow-rate is sufficient for purpose.

- The connection to the supply is watertight.

The flow control and flow time are preset at manufacture, however both may beadjusted, see below.

Flow Rate Control Setting

The TF2020 and TF2020S are factory set to flow position S4. Should the installa-tion pressures require adjustment of the flow rate, any one of the five different flowrate positions, S1 to S5 may be selected, with S5 being the least restrictive.Adjust the flow rate as follows:

1. Isolate the water supply. Remove the tap knob and unscrew the head assembly(see MAINTENANCE).

2. Remove the head assembly and attached cartridge.

3. Turn the adjusting ring (coloured black on the TF2020 and green on the TF2020S)on the cartridge clockwise or anticlockwise according to the flow rate required(see Figure 1 and Flow Rate Adjustment Chart).

Note: Taps are supplied set in position S4.

4. Install the cartridge and head assembly into the body (see MAINTENANCE).

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Figure 1Flow Rate Control Setting Adjustment

+

-

(Refer to flow curves chart for pressure/flow rates)

Position

Visible aperture

S1 S2 S3 S4 S5

Flow Rate Adjustment Chart

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Flow Time Duration Setting (Refer to Figure 3)

The flow time duration setting has been factory set in position 6, which givesapproximately 10 seconds flow duration, but can be adjusted if required. A specialtool is available from Customer Support, free of charge (see ACCESSORIES). Thereare six possible positions, which are set as follows:

1. Remove the knob (see MAINTENANCE).

2. Insert the special tool into the black upper stop and turn to the desired setting.As the black ring is rotated, a lug will appear in the window in the skirt. It isimportant that the black ring is adjusted so that the lug is positively located in thewindow in one of the six positions. To increase the time duration, turn the blackring clockwise. Each position changes the duration by approximately one second(position 1 = approximately 16 seconds, position 6 = approximately 10 seconds).

Figure 3Flow Time Duration Setting

+

-Special Tool

Upper Stop

Skirt

Window

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Hot Water Temperature Control (Refer to Figure 5)

The maximum outlet water temperature can be limited by inserting stop pins(supplied) into the mixer lever. The stop pins limit the mixer lever travel. Insert thestop pins as follows:

Note: The TF2020 and TF2020S are supplied with two pins fitted. This limits themaximum blend temperature to 40 oC, providing the hot supply temperaturedoes not exceed 60 oC.

1. Remove the mixer lever (see MAINTENANCE).

2. Insert the stop pins on the mixer lever as required (see chart at Figure 6) and taphome with a mallet or other suitable tool.

Figure 4

Flow Regulator

Flow

Regulator

Flow

Straightener

Flow Regulator (Refer to Figure 4)

An optional flow regulator is available as a spare and must be installed as shown inFigure 4. This will provide a comfortable flow of about 4 l/min at a pressure ofbetween 1 and 10 bar.

Note: The flow regulator will not function at pressures less than 1 bar.

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Figure 5

Mixer Lever

Mixer Lever

Stop Pins

Figure 6Mixer Lever Temperature Setting Chart

1 Stop50o

2 Stops60o

3 Stops70o

For a 40°C outletwater temperature

with a hot water inlettemperature of 50°C

fit one pin.

For a 40°C outletwater temperature

with a hot water inlettemperature of 60°C

fit two pins.

For a 40°C outletwater temperature

with a hot water inlettemperature of 70°C

fit three pins.

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OPERATIONTF2020

The TF2020 is simple to use. A firm push on the tap knob starts the water flowing forthe duration of the flow timing. The water temperature and flow timing is factory set,but this can be altered (see COMMISSIONING). If the tap knob is pushed againwhilst the tap is flowing a further preset cycle will commence.

TF2020S

The TF2020S is fitted with a security "S" cartridge. The tap is operated by a firm pushon the tap knob, however, flow will not commence until the tap knob is released. Thewater temperature and flow timing is factory set but this can be altered (seeCOMMISSIONING). If the tap knob is pushed again whilst the water is flowing theflow will cease. The tap knob has to be released again to achieve water flow.

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FAULT DIAGNOSIS

Symptom Cause/Rectification

a. Check the piston seal for cleanliness.b. Ensure that the spindle spring slides freely in its aperture.

Refer to MAINTENANCE for removal.

2. Tap will notshut off.

3. Tap shutsoff tooquickly.

a. Check the cleanliness of the sealing cap in the piston.b. Check the spindle spring for damage.

Refer to MAINTENANCE for removal.

a. Check Inlet supplies.b. Remove the cartridge and clean the mechanism under running

water: refer to MAINTENANCE for removal.Note: Cartridges may only be cleaned by flushing throughunder a jet of clean water to remove lodged particles. Donot descale. Cartridges are not serviceable, and mustnot be dismantled.

1. Tap notworking.

(No flow)

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GeneralRada products are precision-engineered and should give continued superior and safeperformance, provided:

1. They are installed, commissioned, operated and maintained in accordance withour recommendations

2. Periodic attention is given as necessary to maintain the product in good functionalorder. Guidelines for frequency are given below.

The maintenance requirement for taps in this series is minimal and concernstemperature, performance and functional checks and inspection, with cartridgerenewal when necessary. In larger installations with a number of taps, it is goodpolicy to maintain a small stock of cartridges so that no tap need be out ofcommission for more than the time it takes to exchange the cartridge. Theminimum designed service life of all cartridges used in our products is five yearsunder normal operating conditions. However, when supply conditions and/or usagepatterns do not conform to 'normal operating conditions' the cartridge may need tobe replaced more frequently (refer to SPECIFICATION for 'normal operatingconditions').

The use of main supply-line or zone strainers (with a recommended maximummesh aperture dimension of 0.5 mm) will reduce the need to remove debris at eachshower control point.

Rada Service Engineers/Agents will call by prior arrangement, if required. ServiceContracts may be undertaken, subject to survey - details upon request.

MAINTENANCE

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Preventative/Precautionary Maintenance(Planned Maintenance Programmes)The frequency and extent of attention required will vary according to prevailing siteand operational conditions however, the following guideline schedule is suggested tocover average duty and site conditions:

Six-monthlyPerformance: check flow rate control and time delay are fit for purpose . Refer toCOMMISSIONING for adjustment.

Visual: check external component condition. Inspect for scale deposition, deformation,damage, corrosion, etc. Maintain or renew as necessary. Lubricate applicablecomponents using only silicone-based lubricant.

LubricantsImportant: Use only silicone-based lubricants on this product. Do not use oil-based or other lubricant types as these may cause rapid deterioration of seals.

Standard silicone-based lubricants may be used on all static seals, and threads, toassist refitting (e.g. Rocol MX22).

Maintenance ProceduresMaintenance must be carried out in accordance with these instructions, andmust be conducted by designated, qualified and competent personnel.

This tap series is designed for minimal maintenance under conditions of normal use.

External surfaces may be wiped clean with a soft cloth, and if necessary, a mildwashing-up type detergent or soap solution can be used.

Caution: many household and industrial cleaning products contain mild abrasivesand chemical concentrates, and should not be used on polished, chromed or plasticsurfaces.

Components are precision-made, so care must be taken while servicing to avoiddamage.

When ordering spare parts, please state product type, i.e. Rada-Presto TF2000,and identify part name and number (refer to the Spare Parts List).

Protection against freezing: Turn off the incoming supply and push the tapseveral times to drain the system. Remove the cartridge (see Removal).

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Removal - TF2020 and TF2020S

Knob (Figure 7)

Note: The knob is under spring pressure.

1. Lift the flap using the end of a small flat-ended screwdriver.

2. Insert a 3mm hexagonal key in the hole under the flap and engage it in the knobhexagon. Turn it 1/

2 a turn anticlockwise against the stop - do not force it.

3. Remove the hexagonal key from the knob hexagon and pull off the knob. Removethe spring from inside the knob.

Figure 7

Knob Removal

3 mm Hexagonal Key

1 2 3

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Flow Straightener (See Figure 9)

1. Insert the special tool in the flow straightener spout and unscrew anticlockwise.

Figure 9

Flow Straightener Removal

Special Tool

Flow Straightener

Flow Regulator (Optional)

Skirt and Cartridge (Figure 8)

1. Remove the knob.

2. The skirt is a push/pull fit located in the tap body by a protruding dowel. Pull theskirt free of the tap body.

3. Unscrew the head nut from the tap body with the special tool or a suitable boxspanner.

4. Remove the head assembly and the attached cartridge.

Figure 8

Skirt and Cartridge Removal

Special Tool

Upper Stop Head Nut

Skirt

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Mixer Lever (See Figure 10)

Remove the mixer lever by unscrewing the hexagonal nut at the base. A 4 mmhexagonal key (not supplied) is required for this operation. Lift off the lever.

Figure 10Mixer Lever Removal

Mixer Lever

4 mm HexagonalKey

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Assembly - TF2020 and TF2020S

Skirt and cartridge (Figure 11)

1. Insert the cartridge into the tap body with the special tool or suitable box spannerand tighten.

2. Fit the seal to the outer groove of the skirt. Align the protruding skirt dowel withthe drilled recess in the tap body and push firmly into place.

3. Using the special tool, adjust the time delay ring to the desired setting if required(see COMMISSIONING).

Knob (Figure 12)

1. Lift the flap on the skirt using the end of a small flat-ended screwdriver.

2. Insert the spring in the knob, place the knob on piston rod and push down againstthe spring pressure.

3. Insert a 3mm hexagonal key in the hole under the flap and engage it in the knobhexagon. Then turn it 1/2 turn clockwise to engage in the cartridge piston rodgroove do not over tighten it. Withdraw the hexagonal key and close the flap.

Figure 11

Figure 12

Skirt and Cartridge Assembly

Knob Assembly

Special Tool

Head Nut Skirt

Upper Stop

3 mm Hexagonal Key

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Flow Regulator Option (See Figure 13)

1. An optional 4 l/min flow regulator may be purchased (see SPARES).

2. Remove the flow straightener using the special tool (available from CustomerSupport)

3. Insert the flow regulator into the back of the flow straightener.

4. Install the flow straightener/regulator assembly using the special tool.

Figure 13

Flow Regulator Assembly

Mixer Lever (See Figure 14)

Insert the mixer lever into the tap body and secure with the hexagonal nut at the baseof the mixer lever. A 4 mm hexagonal key (not supplied) is required for this operation.

Figure 14

Mixer Lever Assembly

Special Tool

Flow Straightener

Flow Regulator

Mixer Lever

4 mm HexagonalKey

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SPARE PARTS

Rada-Presto Spare Parts

408.71 Flat-faced Inserts (3)887.16 Cartridge (TF2020)887.19 Cartridge - anti-blocking (TF2020S)887.14 Flow straightener/Flow regulator set887.13 Grey skirt887.15 Knob set (TF2020)887.18 Knob set (TF2020S)887.17 Temperature lever assembly887.27 Strainer Seal887.29 Spring (TF2020s)887.39 FlexibleTail Assembly (Pair)

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Rada-Presto TF2020 and TF2020SSpare Parts Diagram

887.15

887.18

887.13

887.19

887.16

887.14887.17

887.29(TF2020S only)

887.39

887.27

408.71

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ACCESSORIESThe Special Tool 887.20 and 3 mm Hexagonal Key are available to aidmaintenance and flow duration adjustment. They are available from CustomerSupport, free of charge upon request.

Special Tool with 3mm Hexagonal Key 887.20

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23 T A New spare part (887.29) added.24 I A New spare part (887.29) added.B T R New date and issue changed.

REVISIONS AND CORRECTIONSP

age Summary of Revisions

Sta

tus

Form

at

Key T = Text I = IIlustrationA = Addition R = RevisionB = Back cover F = Front cover

August 2002 - Revision: P3664/1 to P3664/2

27

NOTES

28 © Kohler Mira Limited, April 2004

CUSTOMER CARE

GuaranteeThis product is guaranteed against any defect of materials or workmanship for one year from the dateof purchase, provided that the product has been installed correctly and used in accordance with theinstructions supplied.Any part found to be defective during the guarantee period will be replaced or repaired - at our option- without charge, provided that the product has been properly used and maintained.Routine cleaning and maintenance should be carried out in accordance with the instructions supplied.The product should not be modified or repaired except by a person authorised by Rada.

Your statutory rights are in no way affected by this guarantee.

After Sales Service - how we can help youWe have a network of fully trained staff ready to provide assistance, should you experience anydifficulty operating your Rada equipment.

Spare PartsAll functional parts of Rada products are kept for up to ten years from the date of final manufacture.If during that period, our stock of a particular part is exhausted we will, as an alternative, provide anequivalent new product or part at a price equating to the cost of repair to the old, bearing in mind the ageof the product.

Customer Care PolicyIf within a short time of installation the product does not function correctly, first check with the operationand maintenance advice provided in this Manual to see if the difficulty can be overcome.Failing this, contact your installer to ensure that the product has been installed and commissioned in fullaccord with our detailed installation instructions.If this does not resolve the difficulty, please ring your nearest Rada contact who will give everyassistance and, if appropriate, arrange for the local Service Engineer or Agent to call on a mutuallyagreeable date.

Contact:

P3664/1

Rada ControlsKohler Mira LtdCromwell Road,Cheltenham, England,GL52 5EP, UK.

Tel.: + 44 (0)870 600 0221

Fax.: + 44 (0)1242 221925

Rada is a registered trade mark of Kohler Mira Limited.The company reserves the right to alter product specificationswithout notice.