-
-mira 722 series thennostatic mixing valvesINSTALLATION
ADVICEInstaller. This leaflet is the property of the customer and
must be left with the user.
722 (exposed) valves are being supplied as bottom outlet,
withthe drain plug in the top.
722B (concealed valves are being supplied as top outlet
withdrain plug in bottom.
Always connect HOT water to RED inlet, COLD water to inletmarked
BLUE.
The drain plug can be re-positioned to obtain the correctoutlet
position. REFER TO CHART BEl1JW.
bir-sbif-s
r~\t'CJ.I
Top Outlet
~1%1\L~)\,." J
biv..ser-sef-s
,I
J
Shower Fittings. Refer separate leaflet P1069/3
ev-s
Bottom Outlet
\ II ', ;
~/~
Flow control is incorporated in the mixing valve, eliminatingthe
need for check valves on the inlets. No form of flow controlshould
be fitted on the outlet.
Conveniently situated isolating valves for servicing
purposesshould be fitted.
Installations must comply with requirements of local
waterauthority by-laws.
Mira 722L, 722LB (low capacity) also Mira 722E, 722EB
(leveraction) models are installed similarly as described for Mira
722,Mira 722B models.
Important PointsIn the UK, hot and cold supplies MUST originate
from a coldwater cistern and must NOT be connected directly to the
coldwater main.
Certain types of instantaneous water heaters can be used, but
wemust first be consulted. There is an approved layout which mustbe
followed. All information necessary iEavailable on
request.PressuresMinimum static to discharge point e.g. spray head
9kPa (3fthead). *The absolute minimum head is 2ft. In such cases
shortpipe runs must be used and good plumbing
practicelfollowed.Under these conditions the flow rate will be
approxiinately 3.5litres per minute (and the performance of
thermostatic controlscould be slightly impaired). Maximum static
825 kPa (120Ibf/in2).
Note: Minimum pressures with minimum pipe runs requiresvertical
distance from bottom of cold cistern to discharge point tobe 0.92m
(3ft). Due allowance must be made for longer pipe runs.
Where hot and cold pressures are unequal the ratio betweenthem
must not exceed 5:1 e.g. higher pressure must not be morethan five
times lower pressure.
Layout and sizing of pipework must be such that when
otherservices are used, pressures at inlets do not fall
belowrecommended minimum.
Supply lines should be flushed until water is clear,
beforemixing valve is connected.
Where insufficient pressure exists, or a more forceful
sprayrequired, certain types of pumps can be used, but we must
first beconsulted. There is an approved layout which must be
followed.All information necessary is available on
request.Connections Inlets/outlet: 1/2inBSP
Connect HOT water to inlet marked RED and COLD water toinlet
marked BLUE. Connections, when facing mixing valve, arehot left,
cold right.
6~34:4~~3017
09001
dill .5~2 28
Figure 2
l130mm
J•...'
Figure 5
75mm (2'~/".jn) inlet faces
IFigure4
Min 73mm (2~/~in)I I
Figure3
6. Shower FittingsWhere being installed; refer separate leaflet
P1069/3 'ShowerFittings'.
7. Re-fit shroud, hold in place by re-fitting shroud transit
screw(Figure 5).
8. Plaster and tile up to sides to shroud, so that FINAL wall
facerests on the RIDGEwidth of the building in shroud. When
set,remove shroud transit screw and remove shroud or cutaround it
at wall surface.
Installation. Mira 722, 722L, 722E1. Backplate (055 08) is
attached to base by bayonet type fitting.
Turn to remove (Figure 1). Fix backplate to wall using
wallscrews (611 37) provided, with guide lines vertical
orhorizontal (Figure 1). Re-fit base to backplate.
2. Refer Connections within Important Points before
connectingsupplies. Assemble inlet union elbow fittings as shown
inFigure 2. Where pipe concealing plates are used, guide theseover
elbow threads. Hold back firmly on mixing valve whentightening
inlet connections.
3. Check position of outlet, if necessary re-position drain
plug.4. Shower Fittings
Where being installed, refer separate leaflet P1069/3
'ShowerFittings'.
Installation. Mira 7228, 722LB, 722EB1. Supplied with additional
fittings so that it can be built into a
wall, including a building in shroud for protection andguidance
during installation and wall fmishing.
2. The DEPTH of concealment MUST be such that the FINALwall face
(plaster, tiles, etc.) rests on the RIDGEwidth of thebuilding in
shroud (Figure 5).
3. When wall has been chased out to correct depth (Figure
3),remove shroud. Keep shroud for later use.
4. Back plate (052 09) is attached to base by bayonet type
fitting.Turn to remove (Figure 1).Fix back plate in recess using
wallscrews (611 37) provided, with guide lines vertical
orhorizontal (Figure 4). Re-fit base to back plate.
5. SuppliesCheck position of outlet; if necessary re-position
drain plug.Connect HOT water to inlet marked RED.Connect COLD water
to inlet marked BLUE.Support inlet pipes rigidly.Hold back firmly
on mixing valve when tightening inletconnections.
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9. Fit nameplate and flow control knob bolt (supplied loose
infittings packet). Angle mounting bracket assembly (807 06)over
temperature regulating lever and attach to back platewith bracket
screws (60990), so that its plastic ends are 'leftand right' not
'teJpand bottom' (Figure 6),Do not over-tightenscre\ys:
10. Angle-concealing plate (076 01) over temperature
regulatinglever and locate it in posHion on mounting bracket
(Figure 6).Then press so it snaps into position.
Operation and Maintenance Advice(including G72
Series)OperationTurn flow control knob anti-clockwise until desired
force of wateris obtained.
Turn temperature regulating assembly lever until
desiredtemperature of water is obtained.
MaxiqmIn temperature of water at discharge point can beregulated
so that water at too high a temperature is not obtained atdischarge
point e.g. spray head.
To check maximum temperature. Ensure an adequate supply ofHOT
water is available at a temperature in ex(;esSof that requiredfrom
the mixing valve, turn on flow control and move lever toposition
5.
Check temperature with thermometer at discharge point. Forshower
use, recommended temperature setting is approximately43°C
(110°F).
Re-setting Maximum TemperatureRemove flow control knob bolt (610
80), nameplate and flowcontrol knob (039 09). Unscrew 2 attachment
screws (602 26)andremm'etemperature regulating assembly (800 01)
from cover(Figure 9).
Grip larger protruding spline by hand, rotating it (clockwise)
toincrease temperature (anti-clockwi'se to decrease
temperature)until desired maximum temperature is obtained at
dischargepoint.
Set lever on scale to position 5 (Figure 10).Hold in this
positionand replace onto cover, aligning attachment screw holes
with 2holes in cover. Replace attachment screws, do not
over-tighten.Replace flow control knob, nameplate and bolt.
~t~o~FI,~«AMaintenanceIf a new mixing valve fails to operate
satisfactorily it is usually theresult of incorrect installation
and the installer should beconsulted. The Diagnosis Chart which
follows will assist you inidentifying the reason why your new
mixing valve is not~perating satisfactorily.
Refer Important Points within Installation Advice forconditions
within which mixing valve should be installed.
If the mixing valve has operated satisfactorily for a time and
nolonger gives satisfaction, it is possible that service is
necessary.Please note that the internal parts should be kept clean
and suchwork is not included within the guarantee. The
Servicing-Procedures advice which follows will assist you in the
method ofmaintenance. Our experience has shown that due to
thesimplicity of design, the average user is capable of cleaning
theinternal parts, replacing seals, or if necessary, fitting
areplacement cartridge assembly.
You may, if you wish, choose to engage the services of a
suitablyqualified person locally.Gold Plated ProductsGold is softer
than chrome and its abrasive resistance much less.When cleaning, or
using tools during servicing, extra care shouldbe taken.
CleaningGold plated fittings should be cleaned with a soft cloth
and ifnecessary a mild washing up detergent or soap solution and
thenrinsed and rubbed dry.
WarningMany modern household cleaners contain mild abrasives, as
wellas chemicals and should never be used for cleaning gold,
orchrome plated fittings.Servicing ProcedureRefer Figure 13 below
for identification of parts and sequence ofassembly.
Concealed models (722B & G72B). Remove concealing
fittings.722B:- Prise offconcealing plate (from centre, not ends).
Unscrewbracket screws and lift offassembly mounting bracket (Figure
11).G72B:- Unscrew adjusting screws and lift off concealing
plate(Figure 12).
Dismantling - All models1. Turn off water supplies to mixing
valve. Open flow control to
release built-up pressure, then remove flow control knob
bolt,nameplate and flow control knob.
2. Unscrew 2 attachment screws and pull or prise offtemperature
regulating assembly.
3, Unscrew 4 cover screws and pull off cover. Do not lose
coverjoint, invariably found stuck in recess of base. Push
outthermostat assembly from cover or remove from position onport
assembly.
4. Lift outside spring of flow control spindle ('E' models
only).5. Slacken off head assembly with an adjustable spanner.6.
Pull off port sleeve from port assembly. (Ifstuck, wrap a piece
of
clotharoundsleevetoassist removal. Donot resort to use of
metalgrips.) Pull port assembly from base. If necessary, as an
extragrip, replace control knob and bolt onto flow control
spindle.
Figure 7
Clamping bracketscrews and nuts·
Figure 8
• Optional extras
Clamping bracket·
Panel Mounting. Mira 722B, 722LB and 722EB1. Suitable for
fitting into panels up to 16mm (5/8in) thick.2. The building in
shroud is not used when panel mounting, so
remove and discard this part.3. Cut panel to dimension shown in
(Figure 8)4. Remove back plate (05209) (Figure 1) and fit to
clamping
bracket (118 72) with clamping bracket screws (606 78) andnuts
(621 30) (Figure 8),which are available as optional extras.
5. Feed the mixing valve through the panel hole, from the
back,and connect inlet supplies.
6. Supplies 'Connect Hot water to inlet marked RED.Connect COLD
water to inlet marked BLUE.Hold back firmly on mixing valve when
tightening inletconnections. Note. It is essential that inlet and
outlet pipes arerigidly supported.
7. Check position of outlet, if necessary re-position drain
plug.8. Shower Fittings .
Where being installed, refer separate leaflet P1069/3
'ShowerFittings'
9. Fit mounting bracket assembly (807 06) and concealing
plate(076 01) as described within Installation Mira 722B, 722LBand
722EB, paragraphs 9 and 10.
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Port a"ssembly , I~side spring
Th thrust washer I E models only)
Cover ~ ~ // / er~ostat Cover I il,iifW' Port sleevef(JII=I' / ~
COL;J'Iseal ~ (to be free to move)Cover screw Outside springIE
models only) I
~ Thermostat assemblv~ I - Port assembly, ICartridge
assembly
~c~~~~r\~~t~nkr.~t free Thermostat actuator lug location slot
Base lug for port assembly locationretentfon cage
Figure 13
Re-assembly13. Re-assemble in reverse order to above, ensuring
cut-away
section of flange of port assembly and large cut -away sectionin
sleeve locate over lug in base.
14. Replace inside spring over flow control spindle
beforescrewing spindle into head assembly ('E' models only).
15. Ensure small white port assembly thrust washer lies flat
onshoulder of head nut.
16. Replaceoutside sping over flow control spindle ('E' models
only).
17. Fit thermostat assembly over flow control spindle,
ensuringlug(s) locate and engage into small slot(s) on flange of
sleeve.
18. Ensure large white thermostat assembly thrust washer lies
flaton shoulder of thermostat spindle.
19. Ensure cover joint is in position, Fit cover, with
attachmentscrew holes horizontal, over thermostat spindle and
fasten tobase. Close flow control spindle.
20. Turn on water supplies to mixing valve and check for
leaks,then open flow control spindle.
21. Select maximum temperature of water required by
turningthermostat spindle anti-clockwise for cold or clockwise for
hot.
22. Check temperature regulating assembly has not had
splinedbush stripped. If it has, remove retention screws from
backand turn bush 1800 and re-assemble.
23. Adjust the maximum temperature setting and
completere-assembly, as described in 'Re-Setting
MaximumTemperature'. Re-check maximum temperature of shower.
Shower Head (if of our manufacture)24. If shower pattern from
shower head is not satisfactory,
remove centre screw and plate(s). Clean flutes in plates
withstiff bristled brush then re-assemble.
25. Spare plates and screws are available direct from
ServiceDepartment.
G72B
Concealing plate
Adjusting screws
Figure 12
7. Totally remove head assembly and screw out flow
controlspindle.
Cleaning/Replacement of Parts8. Parts may be cleaned using a
proprietory inhibited scale
solvent e.g., Kettle descalent.Note. Care must be taken not to
allow solvent to come intocontact with bathroom fittings and
swfaces.
9. Check that lugged actuator within retaining ring ofthermostat
coil is free to move.
10. Polish mating surfaces of port pillar and sleeve with
metalpolish e.g. Brasso.
11. Check all seals and replace if necessary. Remove seals
bycutting with razor blade or sharp knife. Do not damage
sealgrooves. Lightly smear all seals, also threads of spindle
withpetroleum jelly or similar grease. Sets of seals in
packagedform (935 15) are available direct from Service
Department.
12. If the cartridge assembly is beyond repair, please
contactWalker Crosweller's Service Department by letter ortelephone
for the current price of a replacement cartridgeassembly. Please be
sure to quote the nameplate details of themixing valve. Also refer
to (Figures 14, 15 & 16) for assistancein correct
identification of cartridge assemblies.
Flo\\' cootroll 'f""1knoh holt Flow control knobNamt~plah:Spl i
lWei hush(should nol rnlate O\'t:rIt:\'t~rquadrant -1t..'Clh
MelalleveT withslripped if iI docs) toolhed quadranllhousedl
Diagnosis Otart
Symptom
Hot water supplied by the mixing valvewhen the temperature
control is in thecold position or vice versa.
Only cold and warm water obtainablewith a high pressure spray in
the coldposition and a lower pressure spray inthe warm
position.
Mixing valve operates satisfactorilyuntil other domestic
services arebrought into use.
Leaks from shower fittings of pipework.
Possible Reason
Mixing valve installed with hot waterconnected to the cold water
inlet. Hotwater should normally be connected toleft inlet when
facing unit.
Cold water inlet fed directly from coldwater mains supply. Both
hot and coldsupplies should originate from the coldwater
cistern.
As the thermostat compensates fornormal variations in pressure,
it is likelythat the plumbing design is such thatexcessive
reductions in pressure areoccuring.
Unions or joints require tightening.
Action
Request installer to investigate andrectify. (Also refer
'Reversed Inlets')
Request installer to investigate andrectify.
Request installer to investigate andrectify .
Request installer to rectify.
Persistent leak from shower head (notto be confused with
dripping whichcan occur for a while after shower hasbeen in
use).
Seals have become damaged by foreignmatter in water
supplies.
A setof seals with instructions maybe purchased. If leak
continuesfit a replacement cartridgeassembly.
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Symptom
Flow of water from shower head isinsufficient for satisfactory
shower.
Possible Reason
Minimum pressure requirements notobserved. Vertical distance
frombottom of cold water cistern to showerhead should be 3ft
minimum.
Spray plates are,blocked by foreignmatter in water supply.
Partial blockage or airlock inpipework.
Shower head in use (not of ourmanufactOre) unsuitable for
lowpressures.
Action
Request installer to investigate andrectify .
Remove and clean spray plates bybrushing out flutes.
Request installer to investigate andrectify.Fit shower head of
our manufacture.
Temperature satisfactory at first butfails before the shower is
completed.
Maximum temperature obtainable iseither too high or too low.
No temperature control afterperiod of satisfactory use.
Hot water storage temperature is notbeing maintained. The mixing
valvemust be supplied with hot water whichis always well in excess
of the mixedtemperature required.
Maximum temperature requiresre-setting.
Build up of deposits on internal parts,
Ensure hot water storage temperatureis adequately maintained,
preferablyat least 20"Cabove the showeringtemperature.
Re-set the maximum temperature ~yfollowing the instructions on
page 3.
Clean internal parts - refer'Servicing Procedure'.
outerspring
*Refer Reversed Inlets below
Nameplates043 01 Nameplate (G72,GnB)043 02 Nameplate (GnL,
GnLB)043 06 Nameplate (G72E,GnEB)
StandardModels squareportIngs Lowcapacity[L)
triangularportings(90221) 722,722B.G72&G72B models[90223)
722L,722LB.G72L&G72LB
Figure14 ~ IFigure15~~portsleeve ~portsleeve4mm[5/32")holes
ridge' 2mm[3/32")holes ridge'
G72 Series Spares Only L '(E) . I rt'XC ever actIon tnangu ar po
mgsG72 (e models) models(90225) 722E,722EB.G72E&G72EB
058 01 ackplate retaining spigot .(}05601 Backplate Figure
16.Jr/160814 Backplateretaining screwG72B (concealed models)075 01
Concealing plate61005 Adjusting screws (2)053 09 Back plate609 60
Back plate retaining bolt556 43 Locating pinAll G72 models001 01
Cover003 01 Body61007 Coverscrews (4)
Identification of Carbidge AssembliesThe cartridge assembly is
the combined port and thermostatassemblies, which are supplied for
user service as a completereplacement cartridge assembly,
Cartridge assemblies for Mira 722 Series can be used for
G72Series thermostatic mixing valves. Ifordering other spare parts
forG72 with the exception of as below, order as for Mira 722
Series.
Important. When ordering a replacement cartridge assembly besure
to quote the nameplate details of the mixing valve. ReferFigures
14, 15 and 16 which illustrate the differences betweenstandard, low
capacity (1) and lever action (E)cartridgeassemblies. Identity of
the removed cartridge assembly can bechecked from Figures 14, 15
and 16.
Note. Thermostat assemblies are common to standard, lowcapacity
(1) and lever action (E)models. Figures 14, 15 and 16therefore
illustrate the port assemblies only and identify
thedifferences.
Parts ListWhen ordering spare parts quote, type of mixing valve,
codenumber and name of component.001 03 Cover003 03 Base03017 Union
elbow (2)039 09 Flow control knob041 01 Flow control lever
(722E)044 60 Nameplate (722)04461 Nameplate (722E)044 62 Nameplate
(122M)044 63 Nameplate (722L)050 01 Inside spring (722E)050 02
Outside spring (722E)052 09 Backplate055 08 Backplate076 01
Concealing plate089 03 Drain plug
090 01 Pipe concealing plate (2)*11872 Clamping bracket *552 28
Nipple adaptor (2)606 26 Screw -attachment (2)
Figure17
~04101
~
* Optional extras
*60678 Screw-clamping bracket(2)606 90 Screw- bracket (2)61014
Screw - cover (4)61080 Flow control knob bolt611 37 Screw-wall
(2)
*621 30 Clamping bracketnut(2)624 09 Union riut (2)632 38 Cover
joint63409 Gasket (4)634 56 Gasket636 17 Head thrust washer636 25
Thermostat assembly thrustwasher
800 01 Temperature regulating assembly*805 15 Clamp bracket
assembly807 06 Mounting bracket assembly902 21 Cartridge
assembly(722)902 22 Cartridge assembly(722reversed)902 23 Cartridge
assembly (722L,722M)902 24 Cartridge assembly(722L,722Mreversed)902
25 Cartridge assembly(722E)902 26 Cartridge
assembly(722Ereversed)93515 Set of seals
Part numbers for complete replacement 'reversed'
cartridgeassemblies for Mira 722 or G72 Series are
Reversed InletsREVERSED INLETS. (Refer item 1 of Diagnosis
Chart). This canusually be corrected by crossing the inlet supplies
at a convenientpoint e.g. in the roof space. If this is not
possible, a 'reversed'cartridge assembly is obtained from Service
Department,identified by the absence of the ridge mid-way on the
port sleeve.
StandardModels902 22
Low CapacityModels902 24
Lever ActionModels902 26
MiraisaregisteredtrademarkofCaradonMiraLimited.
Republic of Ireland
Tnecompanyreservestherighttoalterproductspecificationswithoutnotice.Modern
Plant Ltd. A ('"",adoncompanyOtter House, Naas Road, Clondalkin,Co.
Dublin, Eire. tel. 591344 telex. El93657
Caradon MiraCaradon Mira LimitedCromwell Road, Cheltenham GL52
5EPtel. 0242 221221 telex. 43242
P1162/6 PrintedinUK·T © CaradonMiraLimited,September1987