TREVI B O O S TI N S T A L L A T I O NBuilt-in Shower MixerExposed Shower Mixer

I

126

mixed out4

Built-InFig. 1

Exposed

Dimensions (in millimetres) may vary within permitted tolerances.. . . . .

Please read these instructions components which arecarefully before commencing numbered and referred to in

! tj$$&&i; j. .

installation and familiarise the instructions.. .**. .. . .**. .

yourself fully with the Dimensions of the mixers are. . . . . . . ‘ . .. . . . .’

shown in Fig. 1.. . . . . . . . . .

assembly details, the exploded ..__......diagram (Fig. 2) and list of TREVI SHOWERS

i.................____. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fig. 2- illu

stra

ted

in in

sta

llatio

nc

on

figu

ratio

n 6

(Se

e F

ig. 8

)

RefNo. Description Part No.1 cover plate for Built-In

~__-la cover plate complete for Built-In 0964066--_ _ -2 cover plate sealing rings for Built-In 0962601003

-___foam aasket for Built-In

-.-2--p

4 cover plate fixing screw for Built-In 0961137--5 cap for volume control handle 0962585006

~______screw for volume control handle

7 cap for temperature control handle 0963073008 screw for temperature control handle-.918416009 shroud 0962599--10 volume control handle carrier 09616590011 clutch cover1 la clutch cover sealing washer12 clutch cover fixino screws12a clutch complete13 clutch drive shaft 096306700--.___14 gears for clutch14a cOne screw ---.-- ~~~--__~~~

15 back plate for clutch assembly16 flushing outlet 096292700- __--..--~--.--~ .._._ ~~17 ‘& cartridges 09616480017a ‘0’ rings for cartridges

RefNo. ’ Description18 booster cartridge18a set of ‘0’ rings and screens

for booster cartridae

Part No.096334800

09630690019 shroud spacer washers (rubber)20 temperature handle carrier 09625890021 temperature handle stop 98625890022 blankino oluo

-w

23 volumecontrol handle 0962586--24 temperature control handle 0963347--25 mounting template/plaster guard

for Built-In~-___26 mounting template/plaster guard screws

for Built-In27 cover for Exposed -_____~27a cover complete for Exposed 0990953--28 plastic trims for Exposed cover 09630720028a plastic pipe trims for Exposed cover 09632640029 cover sealing rings for Exposed 09626010030 cover fixing screw for Exposed 0961137--31 %’ x ‘4’ BSP shower outlet

for Exposed 09910770032 %I’ BSP x 22mm compression elbows

for Exposed 099108200

Spares: Please state description and part number when ordering.

General NotesTrevi Boost is designed to beinstalled on normal UK tank fedhot supply and mains fed coldsupply. The pressure of the coldwater is used to boost thepressure of the blended waterabove that of the hot supply.This is done using the Venturiprinciple as described in sectionon Operation.Both modefs have beenmanufactured to be fitted in avariety of instalfationconfigurations to suit theshower room design, (seeinstallation section item 1).Connections on the all brassmixer body are % BSP and aremarked ‘hot in‘, ‘cold in‘, and‘mixed out‘. There are twomixed water outlets, one ofwhich must be plugged with theblanking plug supplied, (22).

The supply pipework should be15mm copper on the cold sideand 22mm copper on the hotside. A more stable showeringtemperature will be achieved ifthe hot supply pipe is takenfrom a direct cylinderconnection.Supplied with the exposedshower mixer are two 3/” BSPx 22mm compression elbows(32) for connectinghot and coldsupplies when concealed in thewall. If the mixer is to beinstalled with surface mountedpipework appropriate pipefittings are used (not supplied).The % x ‘4’ BSP shower outlet(31) for the exposed model isconnected to the bottom mixedwater connection for attachingthe shower hose and hand spray.

a

The Trevi Boost is supplied withits own shower kit. (Handspraywith flexible hose or fixed head).These are sized for optimum

.performance and should not bereplaced with alternatives. If analternative shower kit of higheror lower resistance is used theperformance of Trevi Boost wiflbe affected and a satisfactorymixed showering temperaturemay not be achieved. In theevent of the shower headbecoming partially blocked (forexample with lime scale) or theshower hose becoming kinkedthe boosting performance andshowering temperature will bemarkedly reduced. Clean theshower heads regularly. Onlyuse genuine Trevi spare parts ifreplacements are required.

Operating ConditionsTrevi Boost is designed to be pressure must be 1.5 barinstalled on traditional UK minimum and 3.0 barvented systems where the hot maximum. If the cold watercylinder is fed from a cold pressure is between 1.5 andstorage cistern. It is intended 2.0 bar the Trevi Boost willto be installed where the give satisfactory results if thestorage cistern is on the same hot water pressure andfloor as the shower room or in temperature are within thethe roof space immediately shaded area of Fig.3. For coldabove the shower room (see pressures between 2.0 - 3.0Fig. 5). The cold water bar, the hot water conditions

defined in Fig. 4 will apply.If direct mains cold waterpressure is greater than 3.0bar, a pressure reducing valvemust be fitted. If inputconditions are minimal, (i.e. onthe diagonal line on Figs 3 or4) then mixed showertemperature may only read40°C. (See Installers Guide forfurther information).

Hot water requirement when cold pressure is 1.5 - 2.0 bar

“C

-0.5

I”

metres

Fig. 3

I I I I b0.5 / 1.5 2.5

1.0 2.0 3.0

hot water head

Hot water requirement when cold pressure is 2.0 - 3.0 bar“C

metres

I I I I *

-0.5 I 0.5 1.5 2.51.0 2.0 3.0

Fig. 4 hot water head

4

coldwaterstoragetank

old mains

I

3m mdx

hose must be restrained to ensurehandspray cannot come within 20mmof spill-over level of bath or shower tray

I 4

50cm max

!I- - - - -

I 5cm max

must be %” or 22mm

first point minimum

rf draw oft hot supply/ /

hot supply /must be 22mmminimum

Im min

single check valve

hot water’ storage

cylinder

single check valve%” or 15mm

minimum /A

cold supply

‘... hot supply toother appliances

Fig. 5

5

Principle of OperationThe hot and cold inlet suppliesare controlled by twin ceramicdisc cartridges (17). To operatethe valve, turn the volumecontrol handle (23)anti-clockwise through 180”.This admits hot and cold waterinto the booster element whichis also a separate removablecartridge.

The booster element increasesthe pressure of the blendedwater using the Venturiprinciple, (See Fig.6).

Trevi Boost is designed to give areasonably stable outlettemperature even though the

hot water(head

-0.5m to 3temperature

55°C mini

boosted water

cold inlet pressure may vary asother fittings in the house arebeing used. However, to providecomplete protection in the eventof a cold water failure, itincorporates a thermalshutdown device. This deviceuses a thermal element whichreacts to over-temperaturewater, pushing a valve on to theseat at the bottom of thebooster cartridge, (see Fig. 6).In the event of a cold waterfailure this valve elementreduces the output flow of TreviBoost to a trickle if the waterexceeds 45’: “C. The actual

temperature at which the mixedflow is cut off will vary fromvalve to valve but will usuallyoccur in the temperature range45 - 48°C. The flow is notcompletely stopped since to doso may confuse the user intothinking the valve is turned offwhen in reality it would reset assoon as the water inside it hadcooled. Trevi Boost is a littlesensitive to the height of theflexible spray head and a slighttemperature rise may benoticed as the spray head islowered.

r inletfrom.0m)frommum

mixedoutlet

increasetemperature

temperaturecontrol

Cold water inlet_(pressure from1 .Ibar to 3.0bar)

thermal shut down devic(reduces flow to atrickle if mixed watertemperature r?rises above 45 16 “C

:e

Fig. 6

6

Byelaws InstallationAs the incorrect installation ofwater fittings may result incontravention of Water Byelawsrequirements the followingINSTALLATION REQUIREMENTSAND NOTES (IRN) are intendedas guides to water undertakersand consumers, installers and

InstallationSingle check valves must beinstalled on both hot and coldinlets to prevent crossflow. A22mm single check valve isessential on the hot side andideal on the cold side, howevera 15mm check valve can befitted to the cold side as analternative. These should befitted as close upstream as ispracticable, however it isessential they be positionedsuch that they can be servicedafter installation since anobstruction, especially in thehot side will greatly reduce theshowering temperature. It isrecommended that thepipework upstream of thecheck valve be flushed outbefore the check valve is fitted.The following WRC listed checkvalves have been tested andfound to be suitable for usewith Trevi Boost.

Socla22m CR Socla 22 BS- 6282(22mm) Socla CR 3/4’

EtrefcoSC2CR Flamco DN 22 (22mm)

Reliance Water Control Ltd.RWC Flowguard SC 75 C CRW(22mm)

Conex Sanbra Ltd.CR Alsta Saeflo A 30 (22mm).

Requirementstheir customers.The IRN’s relate to the Byelawsimplemented by waterundertakers from 1st January1989. For further informationsee “Water Supply ByelawsGuide” published by the WaterResearch Centre (International

The restraint ring supplied withthe Trevi shower kit MUST befitted such that the showerhead can come no closer than20mm above spillover level ofthe shower tray or bathtub overwhich the shower is installed.

mixed out mixed out

volume *

I$ czd mzedin out

Built-h

Book No. ISBN 1 870779 02 9)

The following I RN’s apply tothe Trevi Boost fitting.IRN Nos. 101 * and 109*.Refer to list included onseparate sheet.

I. Trevi Boost is deliveredready for installation with thevolume control on the left andthe temperature control on theright.(See configuration A - Fig. 7).

hit czd mzedin out

Exposed

Fig. 7 As delivered Installation Configuration A

temperBuilt-In Exposed

Fig. 8 Installation Configuration B

lume

Trevi Boost can also be installedin a vertical position as illustrated

temperature

uilt-In

7

2.3 Place the Trevi Boost bodyin the orientation required andrefit the temperature handlestop (21) so that the large stopstep is to the right hand sideand the appropriatescrewdriver recess is at thetop. Ensure the temperaturehandle stop (21) is pushedfully on to the hex, (see Fig. 9).2.4 Refit the temperaturehandle carrier (20) by screwingfully clockwise. Replace shroudspacer washers (19) andshroud (9) and push fullyhome.

outlet to shower

.i p 4 5 - 6 5

1 minimum

showing ptastea . guard use

finishedwall surface

maximum

Ii-J\mounting template/plaster guard (25)

uilt-In installation

. The Trevi Boost built-inodel is designed to becessed into the wall and the

epth of recess should be

wall surface.An allowance for tiling etc.must be made. There is anadjustment of 20mm in theinstallation depth - minimum to45mm maximum 65mm fromfinished wall surface to thecentre line of the connections.The maximum/minimumdepths are indicated on themounting template / plaster

2.5 Place temperature controlhandle (24) on the handlecarrier (20) with the blackbutton (Fig, 12) approximatelyto the top and push fully home.Withdraw handle againcarefully by about 6mm or7mm until it is only just free ofthe splines and able to rotate.Hold this distance from thebody, rotate carefully clockwiseuntil the handle is felt to touchthe slop. Push temperaturehandle (e4) fully home andtighten screw for temperature

c

2aaa

B

3mred

Fig. 10 detail

ontrol handle (8).

.6 Rotate handle clockwisend then anti-clockwise againnd check that handle stopsgainst the stop.

Installation (continued)Changing the Valve Orientation

2. If configuration B - Fig. 8 isrequired, proceed as follows.

2.1 Remove the cap (7) andundo the screw (8). Pull off thetemperature control handle(241, the shroud (9) and theshroud spacer washers (19).

2.2 Unscrew the temperaturehandle carrier (20) and priseoff the temperature handle stop(21) by inserting a screwdriverin the slots provided.

screwdriver

ht hand side

21 2 0 ’ Fig. 9

measured from the finished guard (25) supplied.

4. Chase out wall for mixerbody and pipework. Locatepjpework to suit connectionson the mixer body and flushout thoroughly to removedebris, (see item 13).5. Screw blanking plug (22)into the unused mixed waterconnection on the mixer bodyusing PTFE tape.6. With mounting template /plaster guard (25) attached tothe mixer body, locate the bodyin the wall and connectpipework using appropriatepipe fittings and PTFE tape,Inlets and outiets are clearlymarked on the mountingtemplate / plaster guard (25).Do not make any solderedjoints near the mixer as thiscould damage the cartridges.7. Screw the mixer body to thewall using fixing lugs as shownin Fig. 10. The mixer must besquare with the finished wallsurface. Ensure pipework isrigidly secured to wall.

6. Remove plaster guard (25).Exposed Installation9. If concealed pipework is tobe installed, fit the two 314”BSP x 22mm compressionelbows, using PTFE tape, to thehot and cold connections onthe mixer body (Fig. 11). Theremoval of coupling nuts onthe elbows will facilitate theoperation otherwise the nutswill foul each other.Connections for surfacemounted pipework are shownin Fig. 11 and again PTFE tapeshould be used. Do not makesoldered joint near the mixer asthis could damage the cartridge.

10. Fit the %’ x ‘h” BSP showeroutlet (31) in the bottom mixedwater connection. Fit theblanking plug (22) in the topmixed water connection. PTFEtape should be used with bothitems. See also Fig. 11.11. For a concealed pipeworkinstallation chase out the wallfor supply pipework and thetwo % BSP x 22mmcompression elbows which willproject beyond the back of themixer (Fig. 12). Locatepipework and flush outthoroughly to remove debris.Connect supply pipework to thetwo compression elbows and

pack out the mixer behind, ifnecessary, so that the back willbe level with the finished tiledsurface. Complete plasteringand tiling and screw the mixerto the wall using fixing lugs(Fig. 12).

12: For a surface mountedinstallation screw the mixer tothe wall using fixing lugs.Locate pipework (Figs. 7 and8), flush out thoroughly toremove debris. Connect supplypipework to the mixer andensure that it is rigidly securedto the wall. Fit plastic pipetrims for cover (28a) asappropriate.

connectlon forsurface mounted

connectlons

finished

Figs. 11 & 12 illustratad ininstallation configuration B

9

Flushing Operation.l3. Before operating the fittingit is essential to flush thepipework to prevent debrisfrom the plumbing operationblocking the filter and even thebooster element see Fig. 13 and14.. To do this proceed asfollows:-Turn the volume control handlefully clockwise to ensure bothcartridges are closed. Pull offhandle (23) and shroud (9).Loosen screw and removehandle carrier (10).Remove clutch cover fixingscrews (12) and pull off clutchcover (11). Pull out clutch driveshaft (13) and loosen cone

screws (14a) to release clutchgears (14). Lift off both clutchgears (14) and lift off clutchbackplate (J 5).14. Remove cold cartridge byunscrewing anti-clockwise andinsert in its place the flushingoutlet (16). Attach a drain tube.Flush cold system and replacecold cartridge. Repeat operationfor hot cartridge and flush hotsystem. Replace hot cartridgeand ensure both are set in the‘off’ position.

15. Replace clutch backplate (15)and both clutch gears (14) withthe flat side facing downwardsand secure with cone screws

(14a). Replace clutch driveshaft (13) and clutch cover(11) and secure with screws(12). Replace shroud (9),volume control handle carrier(10) and volume control handle(23). Turn volume controlhandle (23) clockwise through360” to synchronise the hotand cold cartridges. Thevolume control handleincorporates a slipping clutchto prevent damage in the eventof over tightening.16. Ensure volume control isturned fully to the off position.Turn on water supplies andcheck for leaks.

‘emove cold cartri%nd drain tube (no3eplace cold cartr

flushing outlet (16)and flush supply pipe.peat on hot cartridge

Fig. 13 removal of gearbox assembly

Fig. 14 flushing drainFigs. 13 81 14 illustrated ininstallation configuration B - See Fig. 6

10

Safety for the userTrevi Boost is notthermostatically controlled andoutlet temperature depends onthe position of the handle, hotand cold inlet temperatures and

OperationCeramic disc cartridges controlthe flow of hot and cold water.Turn the volume control handlethrough 180” to move from off

MaintenanceCeramic disc cartridges

The unique ceramic disc hotand cold cartridges containultra smooth ceramic discs.They are so hard that theyalways remain sealed togetherpolishing one another in use,and sand, sediment or otherwater-borne matter cannot getbetween them or damage them.Even the hardest water has noeffect and this means that theTrevi Boost shower mixershould give many years ofefficient, trouble-free servicewithout the drip and liming-upproblems associated withtraditional shower valves.However, in the unlikely eventof a failure or any problemsimply exchange the cartridges.

To Remove Hot and ColdCartridges

Shut off water supply and turnvolume control handle to the‘off’ position.Refer to section ‘Flushingoperation’ for details on howto remove hot and coldc a r t r i d g e s .

pressures.Before using the shower checkthat the temperature of themixed water is satisfactory.

tdfully on. It is better tooperate the Trevi Boost in thefully on position since the settemperature may vary as the

NOTE: Cartridges are suppliedin sets and both cartridgesshould be changed at the sametime. They both operate in thesame direction therefore theycan be fitted to either side.

Trevi Boost Cartridge

If the flow performance of TreviBoost has become impaired itis possible the shower headmay have become blocked withlimescale or plumbing debrismay have become lodged onthe filter screen on the boostercartridge.Shower Handspray

The shower head must becleaned at frequent intervalsespecially in hard water areas.The construction of thehandspray facilitates this.Adjust temperature handle toposition 1 (full cold setting).Turn on flow control. Rub theflexible spray plate nozzles withthe fingers, This enables anylimescale deposit to becomedetached, and ejected by thepressure of the spray. If thisdoes not completely clean the

Young children, the elderly andinfirm should be supervisedwhen using a shower.

flow control is adjusted.The temperature control handleis marked from 1 to 5 - . .position 5 being the hottest.

handspray, proceed asindicated in the cleaninginstructions supplied withshower head. If this does notimprove the situation the TreviBoost cartridge should beremoved and the filter screencleaned. To do this, proceed asfollows:-Unscrew handle (24) andremove shroud (9) and shroudspacer washers (19). Unscrewcartridge and examine filterscreen. If blocked, clean andreplace in body.Cleaning

No abrasive powders,detergents or polishes shouldbe used for cleaning plated,white or colour finishedbathroom fittings. Cleanserscontaining alcohol and otherorganic solvents or corrosivechemicals should not b,e used.Bleach and denture cleanserscan damage plated or coatedfinish brassware. The finishshould be maintained bywiping with a clean, dampcloth, then polishing with aclean, soft, dry duster.

11

Spares

Spare components andreplacement cartridges areavailable from Trevi Showersstockists.

If you have any difficulty inobtaining spares locally, pleasecontact Trevi Showers, PO Box60, National Avenue,Kingston upon Hull, HU5 4JE.Telephone: (01482) 470788.Telex: 592113.Telefax: (0148%) 445886.

Trevi Showers pursues a policyof continuing improvement indesign and performance of itsproducts. The right is,therefore, reserved to varyspecification without notice.

Trevi is a registered trade mark.

Trevi Showers is a division ofIdeal-Standard Limited.

Trevi Showers,The Bathroom Works,National Avenue,Kingston upon Hull.HU5 4HS, England.Telephone: (01482) 470788.Telex: 592113.Any information reproducedfrom the Water ResearchCentre - “Water Fittings andMaterials Directory” is with thekind permission of the WRcWater Byelaws AdvisoryService.

12

. Trevi BoostInstallers Guide To A Better UnderstandingTrevi Boost is designed to be installed to provide a good shower where

otherwise a normal plumbed-in shower would be pear or even impossible. i.e.

where the available hot’water head is very low’br even siighttynegative. It can

also ba installed where the availabli hot head is better than minimal in 7wtrich

case the performance will be even better.

Trevi boost uses the energy from the mains cold water to boost the mixed

pressure by mixing the two streams in a special pressure boosting venturi

mechanism. Only the energy contained in-the-c&d yater consumed is

available for this process and it is essential therefore that the whole system,

particularly the hot plumbing is installed to give minimum pressure losses.

I \- - - d-1

I .Ihose must be restrained to ensure

Ihandspray cannot come within 20mm

I300cm max of spill-over Ieve of bath or shower tray

I I \

I1OOc.m min

I

single check valveW or 22mmminimumhot supply

single check; 1%” or 15mm

minimumcold supply

valve

Supply ConditionsWhen the input conditions are at the minimum levels specified in thefollowing charts (Figs 1 & 2) the performance of the valve will also be onthe minimum.

OC Hot water requirement when cold pressure is 1.5 - 2.0 bar

metres

I I I I b

-0.5 0.5Fig. 1 1.01.5

2.02.5

3.0

hot water head

4 oc Hot water requirement when cold pressure is 2.0 - 3.0 bar

75

metres

I I I I +

-0.5 0.51 .o

1.52.0

2.53.0

Fig. 2 hot water head

Thus if a Trevi Boost is installed under the following conditions:Example:

Hot water head = O.OmetreHot water temperature = 65°C

Cold water flow pressure = 1.5barThen the showering conditions would be:

Maximum showering temperature = 40.5%

Shower flow rate = 5.3/itres/mhu te

This assumes the installation has been carried out in accordance with goodplumbing practice and that the Trevi Boost installation instructions havebeen carefully followed.

Performance ExpectationsFigs 3 and 4 show the mixed showering temperature and mixed water flowrate to be expected under any particular set of installation conditions.

TREVI BOOST - Maximum Mixed Temperature at Various Hot Water HeadsOC Cold water flow pressure 1.5 BAR

46

55 60 65 70 75 80 ocHot Water Temperature

Note: Maximum temperatures are approximate and may vary a little depending on installation conditions

Fig. 3

TREVl BOOST - Flow Rates at 40%Sho

10.0

6.0

55 60 65 70

Hot Water Temperature

75 80 OC

Note: Flow rates given are approximate and may vary a little depending on installation conditions

Fig. 4

If difficulties are experienced in reaching these levels of performance theremay be several causes. See items 1 - 6 on the following paGes

1 There may be a restriction in the hot supply pipes.

’ Since the.energy to boost the shower pressure comes only from the coldwater consumed, any restriction in the flow of hot water will upset the ratioof Hot and Cold and thus reduce the mixed water temperature. If difficulties

are being experienced the flow rate through the hot pipework should bechecked as follows.Turn off hot supply and remove hot cartridge. Replace with the flushing

outlet (Part No.096292700) Item No. 16.

Turn on hot supply and measure flow rate in litres per minute from thenozzle. If the flow rate does not match that shown on Fig. 5 then arestriction must exist in the hot plumbing and the following points should be

checked.

TREVI BOOSTl-lot flow rate through %” flushing outlet

0 0.5 1 1.5 2 2.5 3 metres

Fig. 5 Height from cistern water surface to centre of Trevi Boost valve body

(a) The hot side of the system must be plumbed in 22mm pipe with as

few bends as possible. If 15mm is used even for a short length of the

hot supply, the temperature of the mixed water will be reduced.

(b) The check valve on the hot side must be 22mm or size 3/4.

(c) The check valve may have become partially blocked due to limescale or

plumbing installation debris, If this happens the effective head of the

hot supply will be reduced and a lower mixed water temperature will

result.

NB

(d)

W

0)

(9)

The check valve must be sited in a position where it can be

serviced after installation.

If the hot supply is conducted above the ceiling care must be taken to

ensure the pipe is properly vented since air locking which can result

will restrict the hot flow. This will reduce the mixed water temperature.

There must be no other obstructions eg: PTFE tape brigAging the end of

a connection spigot.

Where hot water head is less than 0.5 m, long pipe runs and many

bends must be avoided.

The stop valve/or valves between the cold cistern and hot storage

cistern may only be partially open. Ensure all stop valves are fully

open.

2 The mixed water outlet may be partially obstructed

The Trevi Boost’s performance is dependant on a carefully controlled back

pressure. For this reason a special hose (where a flexible shower is

specified) and spray head are supplied with the valve. If Trevi Boost is

failing to give the temperature indicated on Fig 3 then there may be an

obstruction downstream of the boost cartridge. One of the following

reasons may be the cause:

(a) The shower head may have become partially limed up. b clean the

shower head, turn the temperature control knob to full cold and open the

flow control fully Rub the rubber spray nozzles on the spray plate with the

fingers - this should dislodge any limescale which may have started to

build up. If this fails to clear the spray holes completely it will be necessary

to dismantle the spray head and clean the rubber spray plate separately

Reassemble and check the mixed temperature.

If the handspray has become damaged in any way and requires to be

replaced it is essential to the correct operation of the Trevi Boost that it be

replaced with a handspray of the same resistance. This handspray has

Part No.035566200

(b) If the flexible shower hose has at any stage been partially flattened or

kinked the inner skin of the hose may have become detached and could

be causing a restriction. Fit a replacement hose of the same type and try

again.

The performance of Trevi Boost is dependant on the Correct hose

being fitted. Replacement hose Part No.0991 02463

(c) Installation debris may have become lodged in the Trevi Boost

cartridge around the temperature safety cut-out and may be causing’

a restriction. With flow control turned off remove the Trevi Boost

cartridge and inspect. If obstructed clean carefully and replace.

3 The temperature control handle may be wrongly positioned on thecartridge

If the handle has been removed during installation it may not have beenreplaced correctly and may be rotating against the stop before the cartridgehas been adjusted through its full travel. This will prevent the mixedshowering temperature reaching its design maximum. Refit handle inaccordance with the installation instructions.

4 The temperature handle stop may not be fully seated on the body ofthe booster cartridge

When the temperature stop is pushed on to the hex at the end of thebooster cartridge it must be pushed fully home otherv4se it will prevent thefull travel of the temperature control mechanism. This could prevent theTrevi Boost cartridge being adjusted to the full hot setting.

5 There may be a restHction in the cold supply

If there is a restriction in the cold supply preventing the full line pressure ofcold water reaching the Trevi Boost the flow rate and temperature may notreach the performance levels indicated in Figs 1 & 2. lb verify the cold flowpressure do the following test.

(a) Set the handspray to the normal showering height and check that the

handspray is free from debris and limescale.

(b) Adjust the temperature control knob to full cold.

(c) Turn flow control knob to full on.

(d) Measure flow rate in litresiminute using a graduated bucket and

stopwatch.

(e) Read off flow pressure on Fig 6 against this flow rate.

(le

6 T

F

F

F

Iten

TREVI BOOST - Flow Rate at Full Cold

Measured Through Shower Hose and Handspray at Normal Showering Height

litres/minute20

16

8

6

Fig. 6 cold pressurear

N.B. If the flow rate is less than 12 litres/minute then the flow pressure isss than the required 1.5 bar).

he stored hot temperature may be less than the required minimum

or a shower of 40°C the following stored hot water temperature is required.

or Cold Pressure Between 1.5 and 2.0 BarHead (hot water) Required

Hot Temperature

-0.5m to O.Om 70°CO.Om to 0.5m 65°C0.5m to I.Om 60°CI.Om and above 55°C

or Cold Pressure Above 2.0 BarHead (hot water) Required

Hot Temperature

-0.5m to O.Om 65°CO.Om to 0.5m 60°C0.5m and over 55°C

t is recommended, in the interests of safety, that hot stored watermperatures above 65°C should only be used where the hot water head isegative.

lrevi Boost Mixer Only CartridgeThe highest mixed water temperature achievable is shown on Fig 3 and theprevious explanation covers all the likely installation problems which mayhave combined to reduce this figure. If, however, a higher showeringtemperature is required it will be necessary to increase either the hot watertemperature or the hot water head. In some cases both may have to beincreased.

If these have already been optimised it is possible to increase the mixedwater temperature by Replacing the standard Trevi Boost cartridge with a“Trevi Boost mixer only cartridge”. This is similar to the standard TreviBoost cartridge but without the over temperature cut-out.

With this mixer only cartridge fitted the output temperature is stillreasonably stable to changes in cold water pressure down to 0.5 bar at hotwater heads up to 1.5 meters but, if the cold water fails completely thefull hot water temoerature would be delivered. This of course is noworse than a normal mechanical mixing valve however if making thischange to an installation the householder must be advised. It should notbe necessary to use this solution at hot water heads above 1.5 meterssince the performance should already be good.Please contact Trevi Showers on 01482 470788 if a mixer only cartridge isrequired.

Trevi Showers pvrsues a policy ofcontinuing improvement in design andperformance of its products. The rightis, therefore, reserved to varyspecification without notice.

Trevi is a registered trade mark.

Trevi Showers,The Bathroom Works,National Avenue,Kingston upon Hull,HU5 4HS, England.Telephone : 01482 470788.Telefax : 01482 592113.

Trevi Showers is a division ofIdeal-Standard Limited.

Boost Testing Procedure2: Page 1 of 2

Page 1 of 2

Testing Procedure: Trevi Boost

Note: the tests are carried out in a sequence intended to “fast track” the problems, but ofcourse the sequence can be varied as preferred!

1. Begin by recording the temperatures of the Hot and Cold supplies, check that they do not vary byrunning both for at least 5 minutes, ensure that the flow doesn’t vary during this time.

2. Is the temperature handle fitted in the correct position so that it has the full amount of travel?Correct if wrongly positioned before continuing.

3. Measure the output temperature at the Shower head in it’s normal position. Is it as it should be?

4. Examine the shower head, is it the correct type? Is the pattern from it good, or is the flow patternpoor? Carry out the normal cleaning operation for the shower head by turning the temperaturecontrol knob to position 1 (maximum cold setting) and scratching the spray plate nozzles todislodge any particles. If the nozzles do not stick out fully from the spray plate , then thediaphragm has shrunk: Replace the insert

5. Remove the Shower head and see if the temperature rises, if it is now at the correct level, replacethe shower head, if not do the same test by removing the hose and replacing if necessary.

6. If there is still a problem take off the Handles and front plate from the Trevi Boost, replace thevolume control handle, remove the Temperature handle carrier and the handle stop , pack theirregular cavity in the wall with plastic bags to prevent the loss of parts, and leakage of water intothe wall cavity and then remove the boost cartridge and examine it. Are the filters clear? Is thetemperature limiter off centre in it’s housing? (this can reduce the output flow and temperature) Open the volume control fully and flush out the mixer.

7. Undo the two screws on the gearbox and remove the cover and spindle, operate the valvesindividually and check that they are free moving, and that the clutches work. Replace anydefective parts.

8. If a cartridge flushing nozzle is available then the clutches, backplate and each flow cartridgeshould be removed in turn and the nozzle used to flush out the body.

9. Refit the gearbox and screws, and refit the volume control knob.

10. If a test Nozzle is available fit it into the mixer port and open turn on the Volume control to test theavailable hot head.

11. Consult the test charts , Test the Incoming cold Supply Pressure, and the Hot head. Record theresults, test also the flow rates through the shower head at maximum hot and cold settings,compare the results with the charts.

12. If there is a discrepancy with the pressures and flows obtained, first examine the Check valves forobstructions and clear them, then do the tests again.

13. If the blockage hasn’t cleared, it will be necessary to test the body casting for internalobstructions: remove the gearbox and clutches etc : insert a 5 pence coin into the shower head endof the hose to seal it, replace the boost cartridge to block the port, turn off the supply and removeeach inlet valve in turn, fit the flushing nozzle in place of the valve, restore the respective supply,test and record the flow from the open port.

14. Next replace the back plate for the gearbox and the clutch wheels, but do not refit the drivespindle and gearbox cover. Remove the Boost cartridge, open each valve in turn and test the flowcoming out of the boost port. If there is a difference in the readings from this port and the valveports, then the casting is blocked. (Do not forget to retrieve your 5p piece after this test!

15. Replace the mixer body if a blockage is evident, otherwise rebuild the unit.

Boost Testing Procedure2: Page 2 of 2

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16. Consult your collected readings, if the cold pressure and hot head are outside the minimumparameters, then inform the consumer/installer and make for the exits!

17. If the mains pressure is below 1.5 bar, has the plumber turned the main stop cock to the housedown in an attempt to raise the temperature from the Boost?

I f the temperature is till low but the pressure is above 1.5 bar, and the hot head is very low, then aP.R.V. will be needed to bring the situation under control: you can prove the this will work to theconsumer be removing the geabox cover and spindle and operating the volume control valvesindependently (ie opening the hot valve fully and the cold valve part way)

18. Ensure that the hot supply is both hot enough and constant, and check that the storage cylinder isof adequate capacity (75 gallons as against the usual 40) does the unit run cool after a time?Enquire about airlocking (does the unit make spluttering noises before the warm water arrives?

19. In the rare event of the unit producing hot water that is too hot, has it got a positive head andsomeone has removed the temperature limiter to “improve the supplies?”

20. Have the pipes been fitted in reverse?

21. Have both supplies been fitted either to a tank feed, or both to mains via say a combi?

Consumers frequently misunderstand the functionality of the Trevi Boost and can’t see that since coldwater and hot wlll always be present, the extremes of the temperature range cannot be achieved.The number of units that are fitted with incorrect Shower heads and Hoses is surprising, and very fewconsumers actually clean the shower heads, which are often completely limed up when you visit.