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Size range

Mistral Manual radiator valves areavailable in three sizes, 8mm x 1⁄2"BSP,10mm x 1⁄2"BSP and 15mm x 1⁄2"BSP.

Building in dimensions for MistralManual fitted with wheelhead orlockshield

InstallationSee general installation instructions.

Working pressures and temperatures

Performance

The Mistral Manual radiator valveprovides the following flowcharacteristics under standard operatingconditions.

INSTALLATION & OPERATING INSTRUCTIONS • INSTALLATION & OPERATING INSTRUCTIONS • INSTALLATION & OPERATING INSTRUCTIONS

The following information is provided toensure that users achieve the maximumbenefit from their Mistral radiatorvalves. Please read these generalinstallation instructions carefully beforeproceeding. Further detailedinstructions are found in individualproduct sections.

To ensure that Mistral TRVs functioncorrectly, i.e. provide individual roomtemperature control, the central heatingsystem and all radiators installed shouldprovide sufficient heat to raise roomtemperatures to maximum requiredlevels.

TRVs should not be used in areas whereindividual room thermostats alreadyprovide temperature control, or wherecentral thermostatic control of thesystem is located.

Kv and Kvs valuesThe Kv value of a valve, as displayed inthis document, indicates the volume offlow in m3/h at a determined stroke(control difference) and a pressure lossof 1.0 bar.

The Kvs value indicates the volume offlow when the valve is completely open.

Introduction

Mistral manual

The following diagram shows therelationship between the settings onthe Mistral and Mistral Pro TRV headand the approximate room temperatureachieved.

Temperature settings

Preliminaries1. Select the appropriate Mistral productfor installation. Ensure that the size ofbody chosen will allow sufficient flow ofwater to meet the heat demands of theroom. Also ensure that the valve chosenis correct for the pipe size used in theinstallation.

2. Prior to installation ensure thesystem is free from debris andcontamination.

3. The black protective cap, suppliedwith Mistral and Mistral Pro TRVs, canbe used as a temporary ON/OFFcontroller before the thermostatic sensorhead is fitted. It can also be used as a“decorators cap”.

4. All Mistral and Mistral Pro TRVs arecalibrated in controlled conditionswhere position III equates toapproximately 20°C.

Installation1. Fit the union tail to the radiatorensuring that sufficient PTFE tape, orother suitable sealant, is applied to thethreads. Connect the valve body to theunion tail making sure that thedirection of the arrows, on the valvebody, follows the direction of the waterflow.

Connect the pipe to the radiator valvefollowing steps 1a – 3 adjacent.

2. Unscrew protective black cap whenready to fit the Mistral TRV head. Beforefitting thermostatic heads, adjustsetting to position IIIII, then fit to thevalve body and screw down tighteningnut until secure.

3. When the installation is completeand the system is running normally,adjust the thermostatic heads to thepreferred setting in individual rooms.

4. In the event that a radiator needs tobe removed, we recommend fitting anadditional blanking cap, from theMistral accessories range, to the valvebody. This will prevent any possibility ofunwanted water leakage.

There are two methods of assemblingthe Kuterlite ends of Mistral radiatorvalves

Step 1aInsert the tube firmly into thecompression fitting without removingthe compression nut and ring, ensuringthat the compression ring seatscentrally and that the tube makes firmcontact with the tube stop in the bodyof the fitting.

Step 1bRemove the compression nut andcompression ring and put the nut andthen the ring on the tube. Insert thetube end up to the tube stop in thefitting, ensuring that the compressionring seats centrally. Slide both ring andnut up to the fitting body.

Step 2Tighten the nut by finger and then byspanner until the tube cannot berotated in the fitting by hand. Alwaysuse a high quality open ended oradjustable spanner.

Step 3Tighten the nut a further 1⁄3 to 2⁄3 of aturn for normal joint making (anarrowhead stamped on the face of thenut provides a reference point fortightening). Some variation may benecessary when jointing stainless steeltube and Table Y copper tube. If there isany slight leakage, particularly if thejoint has been disturbed after assembly,the nut may be tightened further asnecessary. However, over tightening thecompression nut will not result in astronger joint and may lead to problemsin service.

Fitting Thermostatic HeadsAdjust setting to position IIIII and fit to the valve body, screw down thelocking nut and secure (do not overtighten). When the installation iscomplete and the system is runningnormally, adjust the thermostatic headsto the preferred setting in individualrooms. If installing a Mistral TRV, snapon the decorative cover which issupplied loose.

General installation

Size A B C8mm10mm15mm

59mm59mm59mm

30mm30mm30mm

54mm54mm54mm

Size MaximumTemperature

MaximumPressure

8mm, 10mm, 15mm 120°C 10 bar

0970

63 V

2/03

06IIIII

IIII

EN 2

15III

III

Off

22

0°C

6°C Frost protection

10-12°C Stairway

14°C Night time

15-18°C Bedroom

19-22°C Living/dining

22-25°C Bathroom

26-29°C Swimming pool


Size rangeMistral TRVs are available in three sizes,8mm x 1⁄2"BSP, 10mm x 1⁄2"BSP and15mm x 1⁄2"BSP.

Building in dimensions for Mistral TRV


OperationLimiting the maximum settingTo achieve this attach the thermostatichead and set the temperature to themaximum desired position. Remove theblack retention pin, found underneaththe setting arrow, and re-insert into theslot directly underneath position IIIII.The temperature adjustment has beenlimited to the set point.

Locking a predetermined settingTo lock a predetermined setting carryout the limiting maximum settingprocedure as detailed above. Thenremove the retention pin positionedunder setting IIIII, and replace it twoslots to the left. The desired settemperature is now locked.


PerformanceThe Mistral TRV provides the followingflow characteristics under standardoperating conditions.

Mistral TRV

Size rangeThe Mistral Pro TRV is available in 15mm x 1⁄2"BSP. To use with 10mm or8mm copper tube use Kuterlite 648reducing sets.

Building in dimensions for Mistral Pro TRV


OperationUsing the black economy clipThe thermostatic head is supplied with aneconomy clip which may be used torestrict the maximum temperature asfollows:

1. Slide the economy clip back with thethumb as far as it will go. Lift the rearend of the clip and remove from thethermostatic head.

2. Rotate the thermostatic head until thedesired maximum setting aligns with thesetting arrow.

3. Next insert the economy clip in thecorresponding slot and push in gently.

4. The thermostatic head can now berotated to any setting up to the set limit.

The economy clip can also be used as asetting marker, or may be removedaltogether by lifting it out of the slot ifit is not required.

In addition to the economy clip theMistral Pro features a locking and limitingdevice.

Limiting the maximum settingThis example illustrates how to limit theMistral Pro TRV to position II.

1. Remove the economy clip.

2. Set the head to position IIIII. Insertthe cover removal tool into theventilation slots of the cover. Pull sharplyand remove the cover to expose theheadwork and setting ring in initialposition.

3. Rotate the exposed sensor head 180°anti-clockwise and lift the setting ring.

4. Align the setting ring with the settingarrow, i.e. the right hand edge of thelimit stop (to the right of the lockingslot), immediately to the left of setting2 marked on the head internals.

5. Re-insert the setting ring and press itfirmly into place.

6. Screw in the sensor head clockwise asfar as it will go, then unscrew until thecalibration notch lines up with the limitstop, the setting arrow and setting 2.

7. Replace the cover making sure that thenumber II lines up with the setting arrow.

8. Press firmly on the cover to snap itinto place.

Other settings are achieved in similarfashion.

Locking a predetermined settingThis example illustrates how to lock theMistral Pro TRV to position II.

Carry out procedures 1 – 3 for restrictingthe maximum setting. Then proceed asfollows:

4. Align setting ring locking slot withsetting 2 marked on the head internals.

Carry out steps 5 – 8 as for restrictingthe maximum setting.

Setting II has been locked in place.

Other settings are achieved in similarfashion.

Re-settingIf for any reason the original setting ofthe thermostatic head has been lost itcan be restored as follows:

1. Remove the economy clip.

2. Set the head to position IIIII. Insertthe sensor cover removal tool into theventilation slots and remove the coverwith a sharp pull.

3. Turn the exposed head clockwise tothe stop, then anti-clockwise until thecalibration notch aligns with position 3as marked on the head internals.

4. Replace the cover, aligning number IIIon the scale with the setting arrow andpress firmly to snap the cover back intoplace.

5. Replace the economy clip.

If for any reason the sensor head hasbeen completely unscrewed the originalsetting can be restored as follows. Theseinstructions vary slightly for the MistralPro head and Mistral Pro remote sensor.

Mistral Pro series1. Insert the setting ring making surethat the base pin engages in the settingring slot.

2. Position the sensor head to therespective head base aligning theadjustment notch with the setting arrow.Now screw the head clockwise to thestop, pressing lightly.

3. Unscrew the sensor head until thesetting notch lines up with setting 3,marked on the head internals.

4. Replace the cover, aligning thenumeral 3 on the scale with the settingarrow and press firmly to snap the coverinto place.

Mistral Pro remote sensor1. Insert the setting ring making sure toline up the limit stop of both the settingring and base.

Follow instructions 2-4 as above.


PerformanceThe Mistral Pro TRV provides the followingflow characteristics under standardoperating conditions.

Mistral Pro TRV

All sizes A B C

Fitted verticallyFitted horizontally

100mm

100mm

28mm

32mm

50mm

47mm

All sizes A B C

15mm fitted vertically15mm fitted horizontally

107mm

107mm

28mm

32mm

50mm

47mm

Size A B C

8mm10mm15mm

120°C

120°C

120°C

10 bar

10 bar

10 bar

1 bar

1 bar

1 bar

SizeMaximum

temperatureMaximumpressure

Maximumdifferential

pressure

15mm 120°C 10 bar 1 bar

Size

Kv valve (m3⁄h)

KvsControl difference (K)

1 1.5 2 2.5 3

8mm10mm15mm

0.250.250.25

0.370.370.37

0.490.490.49

0.580.580.58

0.660.660.66

0.951.151.35

Size

Kv valve (m3⁄h)


1 1.5 2 2.5 3

15mm 0.25 0.37 0.49 0.58 0.66 1.35


The Mistral Pro headDetailed technical information,installation and operating instructionscan be found in the Mistral Pro TRVsection.

Mistral Pro remote sensorDetailed technical information,installation and operating instructionscan be found in the Mistral Pro TRVsection.

Once the valve and head have beeninstalled the remote sensor bulb shouldbe fitted as follows:

1. Fix the mounting bracket horizontallyor vertically as required.

2. Place sensor into the holder and snapthe assembly into the mounting bracket.

3. Lay the capillary tube.

4. Carefully coil surplus capillary tubingon the reel provided and cover withprotective cap.

Never attempt to cut or shorten thecapillary tube.

Mistral Pro remote headOnce the valve body has been installedadhering to the appropriate instructionsthe remote head should be fitted asfollows:

1. First ensure that the remote head willnot be covered by curtains or furniture asthis will adversely affect the performanceof the thermostatic sensor.

2. Carefully prise off the sensor coverwith a screwdriver inserted through thedrilling in the underside, remove thecover from the base plate.

3. Next, fix the base plate to a flat wallor onto a 60mm wall box with the screwsprovided, ensuring that the arrow ispointing upwards.

4. Measure the required length ofcapillary tube which may be buried in theplaster or alternatively run in a 23mmconduit. Wind any surplus around thehooks on the front face of the base plate.

When mounting on a flat wall it isimportant to make sure the capillary tubeis carefully lead out through one of theslots provided.

5. With scale mark III to the top press thecover firmly onto the base plate until itsnaps into place.

Never attempt to cut or shorten thecapillary tube.

Installation of the capillary tube in theconduit1. Carefully unscrew the retaining nutfrom the thermostat actuator housing andwithdraw the capillary tube together withthe thermostat actuator.

2. Push a lead wire through the conduitand attach it to the thermostat actuator.Then using the lead wire draw theactuator and the capillary tube backthrough the conduit.

3. Re-assemble the individualcomponents.

4. Unscrew the protective cap from thethermostatic valve body only when readyto fit thermostatic head.

5. Set the Mistral Pro Remote head tosetting IIIII then fit the thermostatactuator housing to the valve body andtighten until secure.

6. When the installation is complete andthe system is running normally, adjustthe thermostatic head to the preferredsetting.

Restricting the maximum setting1. Set the handwheel with the arrowaligned with the desired maximum settingand remove the cover from the baseplate.

2. Take the red stop pegs from theaccessory pack and insert one with thenarrow side down into the locking groovein the handwheel to the left of thedetente.

3. Replace the cover pressing firmly untilit snaps into place.

Locking a desired setting1. Set the handwheel so the arrow isaligned with the desired setting.

2. Carefully prise off the sensor coverwith a screwdriver inserted through thedrilling in the underside.

3. Take the red stop pegs from theaccessory pack and insert them with thenarrow side down into the lockinggrooves in the handwheel, one to the leftand one to the right of the detente.

Replace the cover pressing firmly until itsnaps into place. The desired setting innow locked in place.

ImportantShould the setting mark ever be removedfrom its guide, it must be reinserted overthe red calibration dot, which is exposedon its removal.

Mistral Pro anti-theft headOnce the valve body has been installedadhering to the appropriate instructionsthe anti-theft head should be fitted asfollows:

1. Unscrew the protective cap from thevalve body.

2. Adjust the thermostatic head tosetting IIIII and fit to the valve body.

3. Screw down and tighten in line withinstructions for standard head.

4. After installation, remove the clip fromthe anti-theft ring with a screwdriver. Theanti-theft ring now rotates freelypreventing the unwanted removal of thehead.

Mistral Pro anti-tamper headOnce the valve body has been installedadhering to the appropriate instructionsthe anti-tamper head should be fitted asfollows:

1. Remove central cap covering theadjuster with a small screwdriver, insertthe setting tool into the opening andturn the head anti-clockwise until itreaches the stop.

2. Screw the thermostatic head clockwiseonto the valve body until resistance isfelt. Continue turning until the retainingscrew hole aligns with one of the twomarks on the rim of the retaining nut.This ensures that the hole is aligned withthe tapping for the locking screw, whichis also aligned with the mark.

3. Insert a 2mm allen key and, with thekey in place fully tighten thethermostatic head.

4. Using the allen key, turn the retainingscrew into the retaining nut as far as itwill go. If the handwheel is now rotatedit will not affect the setting.

5. Using the setting key adjust valve topreferred setting, viewed through the topof the thermostatic head. Finally, replacecentral cap.

Mistral Pro heads

Size rangeThe Mistral Automatic Bypass Valve isavailable in 3⁄4", 1" and 11⁄4" sizes.

Building in dimensions

InstallationSelect the appropriate bypass valve forthe system conditions using theperformance charts provided. TheMistral ABV should be installed, as closeto the pump as is practical, betweenthe flow and return, with the flow inthe direction of the arrow.

OperationSupplied with a standard factory settingof 200mbar, adjustment to suitindividual systems can be achieved byfirst releasing the securing screw andthen turning the handwheel to thedesired position between 50mbar and500mbar.


PerformanceThe Mistral Automatic Bypass Valveprovides the following flowcharacteristics under standard operatingconditions.

Automatic Bypass Valves

Size A B C

3⁄4"1"11⁄4"

85mm

90mm

90mm

32mm

37mm

46mm

40mm

48mm

55mm

SizeMaximum

temperatureMaximumpressure

All sizes 120°C 10 bar

Features

Mistral Prohead

Mistral Proremote sensor

Mistral Proremote head

Mistral Proanti-tamper

head

Mistral Proanti-theft

head

Temperature range 6°C - 28°C 6°C - 27°C 8°C - 27°C 8°C - 26°C 6°C - 28°C

Maximum sensortemperature 50°C 50°C 50°C 50°C 50°C

Sensor Liquid Liquid Liquid Liquid Liquid

Range 0 – IIIII 0 – IIIII I – IIIII I – IIIII 0 – IIIII

Night time setting Yes Yes No No Yes

Frost setting +6°C +6°C +8°C +8°C +6°C

Anti-theft device No No No Yes Yes

Tamperproof temperaturelocking Yes Yes Yes Yes Yes

Tamperproof temperaturelimiting Yes Yes Yes Yes Yes

Economy clip Yes Yes No No Yes

Positive shut off Yes Yes No No Yes

Hysteresis 0.2K 0.2K 0.5K 0.2K 0.5K

Capillary length No 2m 2m No No


Where the required room temperatureis not reached, or is not maintainedinstallers should check the following:1. Is the radiator of sufficient size forthe area to be heated?

2. Is the system running at the designtemperature?

3. Is the pipework sized correctly?

4. Is the radiator poorly positioned inrelation to the heat sensor, i.e. behinda heavy curtain, behind radiatorpanelling or in a bay window or alcove?

Where the thermostat will not shutoff check the following:1. Has the maximum alloweddifferential pressure been exceeded?

2. Is the valve seat clean and free ofcontamination?

3. Is the head fully screwed on?

Where excessive noise can be heardin the heating system:1. Ensure that the maximum differentialpressure has not been exceeded.

2. Ensure that the valve is installedcorrectly with the flow direction asindicated.

3. Install an appropriately sized Mistralautomatic bypass valve.

General trouble shooting

Where appropriate the followingstandards are applicable to the Mistralproduct range:

BS 2767 – manually operated valves

BS EN215 – thermostatic radiator valves

BS 7556 – connections for thermostaticradiator valves

EN 1254 – capillary fittings (part 1)and compression fittings (part 2)

BS 21/ISO 7 – pipe threads

BS EN IS0 9001:2000 – quality systems

Standards and approvals

Contact

InstallationFit appropriate valve bodies to theradiator making sure that the direction ofthe arrows, as indicated on the valvebody, follows the direction of the waterflow. Once installed unscrew the blackprotective cap from the thermostaticvalve body only when ready to fit theselected thermostatic head.

Where Mistral Pro lockshield valves havebeen installed, contractors may balancethe system using the white lockshieldvalve cap provided. Adjustment of thevalve is achieved by inverting the whitelockshield cap which is then located inthe lugs found on the valve insert.Adjust as necessary by turning the valveclockwise to close and anti-clockwise toopen.

Drain off facilityWhere Mistral Pro lockshield valves havebeen installed contractors may drainindividual radiators, without draining the whole system, using a combinationof the Mistral drain off valve, and thediscreet in-built drain off facility,incorporated within each Mistral Prolockshield valve, as follows:

Close the valve, by first inverting thewhite lockshield cap which is thenlocated in the lugs found on the valveinsert. Turn clock-wise until no furthermovement is possible. Before locatingthe drain valve ensure that a suitablevessel or hose is available to capture thefluid held within the radiator.

Attach the drain off valve by firstwithdrawing the central black knob andcontinue until satisfied that the valve isfully secure. Locate the drain valve probeonto the valve insert and then turn anti-clockwise to release the fluid heldwithin the radiator. Additional blankingcaps can be used to provide extraprotection from unwanted water leakage.

Building in dimensions for Mistral Prolockshield bodies


Performance

Mistral Pro valves provide the followingflow characteristics under standardoperating conditions.

Mistral Pro thermostatic bodies

Mistral Pro lockshield bodies

Valve bodies

Size rangeThe Mistral insert fitting tool issupplied in one size which fits allvalves.

Operating instructions1. Remove the thermostatic head fromthe valve body and retain for later use.Next, slightly loosen the valve insertwith a 19mm box spanner and screwthe fitting tool onto the valve body.Ensure the green drain tap is closed atthis point.

2. Open the T handled ball valve andpush the fitting tool spindle in,engaging it positively on the valveinsert. Turn the assembly toolhandwheel anti-clockwise until thevalve insert has been removed from thebody, and then slowly withdraw it as faras it will go. Close the T handled ballvalve.

3. Open the green drain tapremembering to catch any waste water.

4. Unscrew the spindle on the fittingtool, remove the old valve insert andreplace it with the new one. Assemblethe new insert into the valve body byreversing the removal procedure.

5. After completion drain and removethe fitting tool and firmly tighten thevalve insert with a 19mm box spanner.Replace the thermostatic head and setto the desired position.

Fitting tool

Valve

Vertical15mm x 1⁄2"22mm x 3⁄4"

Horizontal15mm x 1⁄2"

Straight15mm x 1⁄2"22mm x 3⁄4"

Reversible15mm vertical22mm horizontal

Mistral ProMistral Pro

anti-tamper headMistral Pro

anti-theft headMistral Pro

remote sensorMistral Pro

remote head

A

107mm

107mm

107mm

107mm

107mm

107mm

107mm

B

36mm

39mm

38mm

N/A

N/A

28mm

32mm

C

58mm

66mm

58mm

105mm

116mm

50mm

47mm

A

107mm

107mm

107mm

107mm

107mm

107mm

107mm

B

36mm

39mm

38mm

N/A

N/A

28mm

32mm

C

58mm

66mm

58mm

105mm

116mm

50mm

47mm

A

107mm

107mm

107mm

107mm

107mm

107mm

107mm

B

36mm

39mm

38mm

N/A

N/A

28mm

32mm

C

58mm

66mm

58mm

105mm

116mm

50mm

47mm

A

107mm

107mm

107mm

107mm

107mm

107mm

107mm

B

36mm

39mm

38mm

N/A

N/A

28mm

32mm

C

58mm

66mm

58mm

105mm

116mm

50mm

47mm

A

80mm

80mm

80mm

80mm

80mm

107mm

107mm

B

36mm

39mm

38mm

N/A

N/A

28mm

32mm

C

58mm

66mm

58mm

105mm

116mm

50mm

47mm

Valve A B C

15mm vertical pattern22mm vertical pattern

15mm straight pattern22mm straight pattern

65mm

68mm

42mm

42mm

26mm

29mm

N/A

N/A

58mm

66mm

80mm

91mm

Size Maxtemperature

MaxPressure

Max. differentialpressure

1⁄2"3⁄4"

120°C

120°C

10 bar

10 bar

1 bar

1 bar

Size

Kv valve (m3⁄h)


1 1.5 2 2.5 31⁄2"3⁄4"

0.250.40

0.370.60

0.490.79

0.580.98

0.661.26

1.352.50

Size

Kv valve (m3⁄h)


1 2 3 41⁄2"3⁄4"

0.090.09

0.520.52

1.151.15

1.791.89

2.092.34

UK Sales: Free Phone 0800 156 0010 UK Sales: Free Fax 0808 156 1011

Technical Help: Free Phone 0800 156 0050Technical Help: Free Fax 0808 156 1012

Pegler YorkshireSt. Catherine’s Avenue,Doncaster, South Yorkshire, DN4 8DF.www.pegleryorkshire.co.uk

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