solar cylinder & heat pump cylinder ranges installation & user … · 2018. 5. 22. ·...

Grant DuoWave SystemSolar Cylinder & Heat Pump Cylinder Ranges

Installation & User Instructions

Part No. DOC 75. Rev 06. January 2011

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Contents1 Introduction &

General Requirements 31.1 Installation Requirements 3

1.2 Water Supply Requirements 3

1.3 Location 3

1.4 Storage and Handling 3

1.5 About Your New Cylinder 3

1.6 Open Vented Hot Water Systems 3

1.7 Taps and Fittings 3

1.8 Pipework Connections 3

1.9 Scaling 3

1.10 Insulation 3

1.11 Health and Safety 3

2 Technical Specifications 42.1 Technical Data - DuoWave Solar 4

2.2 Technical Data - DuoWave HP 5

2.3 Dimensions - DuoWave Solar 6

2.4 Dimensions - DuoWave HP 8

2.5 Connections and Controls 9

3 Primary Circuit Installation 113.1 Grant DuoWave Solar Cylinders 11

3.2 Grant DuoWave HP Cylinders 11

3.3 Systems 11

3.4 Primary Connections 11

3.5 The 2-Port Valve 11

3.6 Auxiliary Primary Connections 11

3.7 Hard Water Areas 11

4 Secondary Circuit Installation 124.1 Cold Water Inlet Manifold 12

4.2 Installation 12

4.3 Expansion Vessel 12

4.4 Temperature and Pressure Relief Valve 12

4.5 Hot Water Supply 12

4.6 Prevention of Scalding 12

4.7 Secondary Return 13

4.8 Tundish 13

4.9 Discharge Pipe 13

4.10 Discharge Pipe Arrangement 14

4.11 Discharge Pipe Sizing 14

4.12 Worked Example 14

5 Electrical Installation 155.1 Immersion Heater 15

5.2 Immersion Heater Wiring Instructions 15

5.3 Dual Thermostat 15

5.4 2-Port Valve 15

5.5 W-plan System 16

5.6 Y-plan System 17

5.7 S-plan System 18

5.8 S-plan System for Grant Aerona HP 19

5.9 Solar Thermal System 20

6 Commissioning, Draining Down & Safety 216.1 Filling Cylinder 21

6.2 Draining Down 21

6.3 Safety Cut-Out 21

6.4 Cold Water Discharge from Tundish 21

6.5 Hot Water Discharge from Tundish 21


6.7 Customer Handover 21

7 Maintenance 227.1 Servicing and Maintenance 22

7.2 Manifold Assembly 22

7.3 Pressure Reducing Valve 22

7.4 Expansion Relief Valve Cartridge 22


8 Fault Finding 238.1 Intermittant Water Discharge 23

8.2 Constant Water Discharge 24

8.3 No Flow from Hot water Taps 24

8.4 Cold Water Flow from Hot Water Taps 25

8.5 Excessive Hot Water from Taps 26

9 Spare Parts 279.1 Spare Parts 27

10 User Instructions 2810.1 User Instructions 28

11 Warranty 2911.1 The Grant Cylinder Warranty 29

11.2 Extended Warranty 30

1 Introduction & General Requirements1.1 Installation RequirementsThank you for purchasing a Grantunvented hot water storage cylinderfrom our Wave range. This installationmanual must be read carefully beforeyou begin installing the cylinder.

This cylinder must be installed by acompetent person in compliance withall current legislation, codes of practiceand local by-laws covering theinstallation of an unvented hot watercylinder. Please also make sure that anyinstallation complies with theinstructions contained in this installationinstruction manual.

1.2 Water Supply RequirementsWe recommend that your GrantUnvented cylinder is installed with anuninterrupted water supply.

Where possible the unit should be fedvia a Ø22mm supply pipe. It requires asupply pressure of 1.5bar with a flowrate of at least 20 litres per minute as aminimum for it to function. Even withthese rates, flow from the outlets will bedisappointing if several outlets are usedsimultaneously. Generally speaking, thehigher the supply pressure, the betterthe incoming system will function. Thecylinder control equipment is factory setto limit the incoming system operatingpressure to 3bar. The maximum supplypressure into the pressure- reducingvalve (PRV) is 12bar.

1.3 LocationThe unit is designed to be floorstanding, vertically mounted, indoors, ina frost-free environment. Whenchoosing a suitable location for thecylinder, consideration should be givento the routing of the discharge pipe to aconvenient point and also the availabilityof an adequate power supply forconnecting the immersion heater(s).

The cylinder may stand on any flat andlevel surface without any specialfoundation preparations, provided that itis sufficiently robust to support the fullweight of the cylinder. (Refer toTechnical specifications for weights).

The position of the cylinder should besuch that easy access is provided forservicing the controls and replacing theimmersion heater should the need arise.

Generally, pipe runs should be made asshort as possible and lagged to preventheat loss.

1.4 Storage and Handling If the cylinder is not being installedimmediately, it should remain in itscarton to prevent damage. Werecommend that the cylinder betransported to its installation position on a sack truck or similar whilst stillwithin the carton.

1.5 About Your New Cylinder DuoWave Solar and DuoWave HPindirect cylinders have two coils forconnection to Primary heat sources.For Solar Thermal to be connected, thebottom coil must be used. Please referto the manufacturers installationinstructions for more information.

The central heating or heat pump (HPversion) connections should be made tothe top coil.

DuoWave Solar and DuoWave HPindirect cylinders are also supplied fittedwith a single 3kW electric immersionheater.

DuoWave Solar direct cylinders have asingle coil only for connection of solarthermal, but are also supplied fitted withtwo 3kW electric immersion heaters.

Refer to page 15 for further details onimmersion heaters.

In all cases, each coil must beconnected using a 2-port motorisedvalve to shut off the flow from theprimary source and electricallyinterlocked with the heat source via thecylinder control and limit thermostat (forsolar installations a high temperature 2-port or solenoid valve must be used).Contact Grant UK for details.

Failure to do so will invalidate allwarranties and will be in breach of The Building Regulations ApprovedDocument G3 (2010).

More information on electrical wiring isgiven on pages 15-20.

1.6 Open Vented Hot WaterSystemsIf required, your Grant DuoWaveCylinder can be used as part of anOpen Vented hot water system, i.e. fedfrom a cold water storage cistern andfitted with an Open Vent pipe, providedthe maximum head does not exceed30m.

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When used in this way, it will not benecessary to install the expansionvessel and cold inlet manifold suppliedwith the cylinder.

Note:The Temperature and Pressure relief(T&P) valve should be left connected tothe cylinder (as supplied). As it may stilloperate due to temperature it should beconnected in the correct manner – referto guidance given in Section 4 of theseInstructions.

1.7 Taps and FittingsAll taps and fittings incorporated in theunvented system should have a ratedoperating pressure of 7 bar or above.

1.8 Pipework ConnectionsAll Pipework connections to the cylindermust be made in accordance withFigures 2-4 to 2-6 as appropriate.

1.9 ScalingIn hard water areas scaling will forminside the cylinder and this will reduceboth the performance and working lifeof the cylinder. Where the totalhardness exceeds 125ppm a highcapacity water softener, or suitablewater conditioner, should be installed inthe incoming cold water supply to thecylinder.

It is recommended that the watertemperature control thermostats (on theimmersion heaters and dualthermostats) fitted to the cylinder be setno higher than 60°C to minimise scalebuild up.

1.10 InsulationAll Grant Cylinders are insulated with40mm thick CFC/HFC free, fireretardant, polyurethane foam injectedbetween the stainless steel cylinder andthe outer casing. This polyurethanefoam has a Global Warming Potential(GWP) of less than 3 and an OzoneDepletion Potential (ODP) of 0.

1.11 Health and SafetyThe information supplied in the table inSection 2 Technical Specification willhelp you assess the safest way tomanoeuvre your cylinder into position.Please use the table to find the emptyweight of your cylinder and thenconsider how you can safely move itinto its final position.

Please leave this manual with thehouseholder after installation.

2 Technical Specifications

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2.1 Technical Data - DuoWave Direct & Indirect Solar Cylinders

DuoWave Direct & Indirect CylindersCylinder model 170 200 250 300 400 500*Storage capacity (litres) 170 200 250 300 400 500Overall diameter (mm) 580 580 580 580 580 660Overall height (mm) 1075 1230 1480 1745 2110 1835Weight empty (kg) - direct models 37 41 47 53 65 N/AWeight full (kg) - direct models 207 241 297 353 465 N/AWeight empty (kg) - indirect models 49 53 63 72 92 108Weight full (kg) - indirect models 219 253 313 372 492 608Secondary return connection (mm) 22 22 22 22 22 22Cold feed/hot draw-off connections (mm) 22 22 22 22 22 22Top/bottom coil connections (mm) 22 22 22 22 22 22Top coil length (m) - indirect models only 5.70 5.70 5.70 5.70 6.81 8.01Top coil surface area (m2) - indirect models only 0.52 0.52 0.52 0.52 0.73 1.14Bottom (solar) coil length (m) 5.70 6.81 8.01 / 6.95* 8.01 11.68 13.90Bottom (solar) coil surface area (m2) 0.52 0.73 1.14 / 1.04* 1.14 1.56 2.00Top/bottom coil pipe diameter (mm) 22 22 22 22 22 22Dedicated solar volume Vs (litres) - direct models 85 100 125 150 200 250Dedicated solar volume Vs (litres) - indirect models 85 100 125 150 200 250Maximum water supply pressure (bar) 12 12 12 12 12 12System operating pressure - pre-set (bar) 3 3 3 3 3 3Expansion vessel charge pressure (bar) 3 3 3 3 3 3Expansion relief valve pressure (bar) 6 6 6 6 6 6Temp & pressure relief valve lift pressure (bar) 7 7 7 7 7 7Temp & pressure relief valve lift temperature (°C) 90 90 90 90 90 90Maximum primary circuit working pressure (bar) 3 3 3 3 3 3Performance:Top coil rating (kW) 8.50 8.50 8.50 8.50 10.00 16.00Top coil recovery rate (mins)** 18 20 25 26 25 27Bottom (solar) coil rating (kW) 8.5 10.0 16.0 / 13.9* 16.0 24.0 27.024hr standing loss (kW) - direct and indirect models*** 2.04 2.45 2.69 2.71 2.94 3.15Check list:Cylinder assembly 170 litre 1 - - - - -Cylinder assembly 200 litre - 1 - - - -Cylinder assembly 250 litre - - 1 - - -Cylinder assembly 300 litre - - - 1 - -Cylinder assembly 400 litre - - - - 1 -Cylinder assembly 500 litre - - - - - 1Expansion vessel 19 litre 1 1 - - - -Expansion vessel 24 lite - - 1 1 - -Expansion vessel 35 Litre - - - - 1 -Expansion vessel 50 Litre - - - - - 1Expansion vessel hose (3/4" BSPF x 3/4" BSPM) c/w washer 1 1 1 1 1 -Expansion vessel wall bracket and band 1 1 1 1 1 -

Adaptor (1" BSPF x 3/4" BSPM) - - - - 1 -Temp & pressure relief valve (7 bar 90ºC) factory-fitted 1 1 1 1 1 1Tundish 15/22mm 1 1 1 1 1 1Drain cock (1/2" end feed) 1 1 1 1 1 -Inlet manifold (3 bar pressure reducing valve & 6 bar exp. relief valve) 1 1 1 1 1 12-port motorised valve 22mm 1 1 1 1 1 1Dual thermostat (Control 25-65ºC High limit 90ºC) - direct 1 1 1 1 1 1Dual thermostat (Control 25-65ºC High limit 90ºC) - indirect 2 2 2 2 2 2Immersion heater 3 kW (13/4" boss) factory-fitted - direct 2 2 2 2 2 2Immersion heater 3 kW (13/4" boss) factory-fitted - indirect 1 1 1 1 1 1

* DuoWave Indirect only. ** Recovery rate is based on 82˚C flow @ 0.2l/s over a 50˚C temp rise for 75% of contents. *** Test carried out at 60˚C.

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2.2 Technical Data - DuoWave HP Indirect Cylinders

DuoWave HP CylindersCylinder model 170 200 250 300 400Storage capacity (litres) 170 200 250 300 400Overall diameter (mm) 580 580 580 580 580Overall height (mm) 1075 1230 1480 1745 2110Weight empty (kg) 57 61 71 80 100Weight full (kg) 227 261 321 380 500Secondary return connection (mm) 22 22 22 22 22Cold feed/hot draw-off connections (mm) 22 22 22 22 22Top/bottom coil connections (mm) 22 22 22 22 22Top coil length (m) 16.02 23.36 23.36 27.80 27.80Top coil surface area (m2) 2.5 3.5 3.5 4.0 4.0Bottom (solar) coil length (m) 5.70 6.81 8.01 8.01 11.68Bottom (solar) coil surface area (m2) 0.52 0.73 1.14 1.14 1.56Top/bottom coil pipe diameter (mm) 22 22 22 22 22Dedicated solar volume Vs (litres) 85 100 125 150 200Maximum water supply pressure (bar) 12 12 12 12 12System operating pressure - pre-set (bar) 3 3 3 3 3Expansion vessel charge pressure (bar) 3 3 3 3 3Expansion relief valve pressure (bar) 6 6 6 6 6Temp & pressure relief valve lift pressure (bar) 7 7 7 7 7Temp & pressure relief valve lift temperature (°C) 90 90 90 90 90Maximum primary circuit working pressure (bar) 3 3 3 3 3Performance:Top coil rating (kW) 32.0 47.0 47.0 55.6 55.6Bottom (solar) coil rating (kW) 8.5 10.0 16.0 16.0 23.024hr standing loss (kW)* 2.04 2.45 2.69 2.71 2.94Check list:Cylinder assembly 170 litre 1 - - - -Cylinder assembly 200 litre - 1 - - -Cylinder assembly 250 litre - - 1 - -Cylinder assembly 300 litre - - - 1 -Cylinder assembly 400 litre - - - - 1Expansion vessel 19 litre 1 1 - - -Expansion vessel 24 lite - - 1 1 -Expansion vessel 35 Litre - - - - 1Expansion vessel hose (3/4" BSPF x 3/4" BSPM) c/w washer 1 1 1 1 1Expansion vessel bracket and band 1 1 1 1 1

Adaptor (1" BSPF x 3/4" BSPM) - - - - 1Temp & pressure relief valve (7 bar 90ºC) factory-fitted 1 1 1 1 1Tundish 15/22mm 1 1 1 1 1Drain cock (1/2" end feed) 1 1 1 1 1

Inlet manifold (3 bar pressure reducing valve & 6 bar exp. relief valve 1 1 1 1 12-port motorised valve 22mm 1 1 1 1 1Dual thermostat (Control 25-65ºC High limit 90ºC) 2 2 2 2 2Immersion heater 3 kW (13/4" boss) factory-fitted 1 1 1 1 1

* Test carried out at 60˚C.

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Figure 2-1: DuoWave indirect solar cylinder dimensions Dia

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DuoWave Indirect Solar Cylinder Dimensions

2.3 Dimensions - DuoWave Direct & Indirect Solar Cylinders


40˚ 30˚22mm Hot water

draw off

1/2" T & P Reliefvalve (factory fitted)

22mm Boiler flow

22mm Secondaryreturn

Boiler stat pocket

Solar stat pocket

22mm Solar flow(not on 500 model)

Immersion heater(factory fitted)

22mm Cold waterinlet

22mm Solar flow(500 model only)

22mm Solar return

22mm Boiler return

0˚30˚

Dims Model(mm) 170 200 250 300 400 500

A 200 200 200 200 200 235B 275 275 275 320 320 N/AC 330 330 330 375 400 600D 380 380 380 420 420 620E 460 460 460 510 510 715F 540 660 795 860 1100 820G 655 790 935 1005 1240 1120H 735 870 1020 1095 1340 1260I 795 940 1085 1155 1500 1390J 800 955 1210 1460 1970 1590K 1025 1170 1430 1695 2050 1640L 1075 1230 1480 1745 2110 1835Dia 580 580 580 580 580 660

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Dims Model(mm) 170 200 250 300 400

A 210 210 210 210 210B 210 210 210 210 210C 230 230 230 230 240D 340 415 460 505 610E 475 605 720 840 1005F 510 635 745 860 1040G 735 880 1025 1250 1430H 795 955 1210 1475 1980I 1025 1170 1430 1695 2050J 1075 1230 1480 1745 2110Dia 580 580 580 580 580

Figure 2-2: DuoWave direct solar cylinder dimensions

Dia

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DuoWave Direct Solar Cylinder Dimensions

40˚ 30˚22mm Hot water

draw off


22mm Secondaryreturn

Solar stat pocket

22mm Solar flow




22mm Solar return

0˚30˚


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Dims Model(mm) 170 200 250 300 400

A 210 210 210 210 210B 275 275 275 280 280C 310 315 375 380 380D 360 375 460 460 500E 460 460 700 855 1100F 690 565 705 1005 1250G 721 765 1020 1290 1550H 735 945 1145 1435 1850I 1025 1170 1430 1695 2045J 1075 1230 1480 1745 2110Dia 580 580 580 580 580

2.4 Dimensions - DuoWave HP Indirect Cylinders

Figure 2-3: DuoWave HP indirect cylinder dimensions

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DuoWave HP Indirect Cylinder Dimensions

40˚ 30˚0˚30˚22mm Hot water

draw off


22mm Heatpump flow

22mm Heatpump return

22mm Secondary return

Solar statpocket

22mm Solar flow



22mm Solar return

Heat pump statpocket

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Item Description Connection Size

1 DHW Out 22mm compression

2 T & P valve connection 1/2" BSPF

3 Boiler return tapping 22mm compression

4 Secondary return tapping 22mm compression

5 Boiler dual thermostat pocket -

6 Boiler flow tapping 22mm compression

7 Auxiliary (Solar) heat source return tapping 22mm compression

8 Auxiliary (Solar) heat source dual stat pocket (for dual stat only) -

9 Cold water inlet 22mm compression

10 Auxiliary (Solar) heat source flow tapping 22mm compression

11 Immersion heater c/w control & limit thermostat (factory fitted) 13/4" BSPF



13 Pressure reducing valve - 3 bar -

14 Balanced cold supply connection 22mm compression

15 Expansion relief valve - 6 bar 15mm compression

16 Temperature & Pressure relief 15mm compressionvalve - 90°C/7 bar

17 Tundish 15/22mm compression

18 Discharge pipe (not supplied with cylinder) -

19 Mains water supply pipe (not supplied with cylinder) -

20 Drain cock (supplied with cylinder) -

Note:Pipework between items 15 and 16 not supplied with cylinder.

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20

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Figure 2-4: DuoWave direct solar cylinders Figure 2-5: DuoWave indirect solar cylinders

2.5 Connections and Controls

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1 DHW Out 22mm compression

2 T & P valve connection 1/2" BSPF

3 Heat pump return tapping 22mm compression

4 Secondary return tapping 22mm compression

5 Dual thermostat pocket -

6 Heat pump flow tapping 22mm compression

7 Auxiliary (Solar) heat source return tapping 22mm compression

8 Auxiliary (Solar) heat source dual stat pocket (for dual stat only) -

9 Cold water inlet 22mm compression

10 Auxiliary (Solar) heat source flow tapping 22mm compression



13 Pressure reducing valve - 3 bar -

14 Balanced cold supply connection 22mm compression

15 Expansion relief valve - 6 bar 15mm compression

16 Temperature & Pressure relief 15mm compressionvalve - 90°C/7 bar

17 Tundish 15/22mm compression

18 Discharge pipe (not supplied with cylinder) -

19 Mains water supply pipe (not supplied with cylinder) -

20 Drain cock (supplied with cylinder) -

Note:Pipework between items 15 and 16 not supplied with cylinder.

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16

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Figure 2-6: DuoWave HP indirect cylinders

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3 Primary Circuit Installation3.3 Systems (DuoWaveIndirect solar cylinders only)If an existing system is a “flow share”arrangement such as an “S” or “Y” plantype system, (see Figures 5-4, 5-5 and5-6) they will provide satisfactoryresults, but during central heatingdemands, hot water production will notbe as responsive. If this is important,consider the use of a “W” plan typesystem. (See Figures 5-2 and 5-3).

3.4 Primary Connections(DuoWave Indirect solar andDuowave HP cylinders only)1. The primary flow and return

connections from the boiler or heatpump (for HP cylinders) should bemade to the upper coil connectionsof the cylinder.

The motorised valve (supplied) mustbe fitted into the primary flow. Theprimary flow and return fittings are22mm compression. The valve has22mm compression connections.

2. Locate the dual thermostat in thestainless steel pocket (refer to eitherFigure 2-1 or 2-3, as appropriate,for location) and secure using theretaining screws on the thermostathousing.

3. Any automatic or manual air ventfitted to vent air from the upper coilshould be installed on the primaryflow pipe to the coil.

3.5 The 2-Port Valve (DuoWave Indirect solar andDuowave HP cylinders only)To prevent gravity circulation when theboiler or heat pump switches off, the 2-port motorised valve supplied withthe unvented hot water kit, must befitted in the primary flow pipe to thecylinder and wired in accordance withFigures 5-3, 5-5 or 5-7 for boilers(depending on system design) andFigure 5-9 for a Grant Aerona heatpump to comply with current legislation.

For other makes of heat pump pleasecheck with the heat pump manufacturerfor connection details.

3.6 Auxiliary PrimaryConnectionsSolar Heating

1. The Solar flow and returnconnections should be made to thelower coil connections. If the lowercoil is not thermostatically controlleda 2-port or solenoid valve (hightemperature rated - not supplied)must be fitted in the flow and becontrolled from the dual thermostatmounted at low level on the cylinder,via the thermostat pocket (8).Contact Grant UK for details.

2. If you are connecting anotherprimary heat source please refer tothe installation manual of thatappliance. Do not connect anuncontrollable appliance to thiscylinder (e.g wood burning stove,multi fuel stove, etc.).

3.7 Hard Water Areas If the cylinder is to be used in a hardwater area, we recommend that theprimary flow temperature be limited to75˚C. This will help reduce the migrationof suspended solids in the water andhelp prevent the build up of lime scale.

3.1 Grant DuoWave SolarCylindersGrant DuoWave indirect solar cylindersare suitable for connection to most fullypumped domestic gas or oil firedcentral heating boilers working on anopen vented or sealed system having amaximum working pressure of 3 barand a maximum working temperature of90ºC. If you are in any doubt over theSuitability of a boiler for use with thecylinder, consult the boilermanufacturer.

3.2 Grant DuoWave HPCylindersGrant DuoWave HP indirect cylindersare specifically designed for connectionto most fully pumped Air Source HeatPump systems (such as the GrantAerona Heat Pump range)- either openvented or sealed systems having amaximum working pressure of 3 barand a maximum working temperature of90ºC. If you are in any doubt over thesuitability of an Air Source HeatPump (other than a Grant Aeronaheat pump) for use with the cylinder,consult the heat pump manufacturer.

IMPORTANTSolid fuel or wood burning boilersand gravity circulation systems mustnot be used on the primary circuitof an unvented hot water system.

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4 Secondary Circuit Installation4.1 Cold Water Inlet ManifoldThis manifold contains a pressurereducing valve (with integral strainer),double check valve, expansion valvewith a stainless steel seat. The pressurereducing valve is factory set. The setpressure is shown on top of the valve.Maximum inlet pressure to valve is 12bar.

4.2 Installation1. Cold water supply to be 22mm

nominal size.

2. Flush supply pipework beforeconnection to remove all flux anddebris prior to fitting the inletcontrols. Failure to do this mayresult in irreparable damage tothe controls and will invalidatethe warranty. Once the pipeworkis flushed connect the coldsupply to the Inlet manifold.

3. The manifold can be installed in anyposition as long as it is installed inthe correct flow direction. Refer tothe arrows on the side of the body.Make sure that the head of theexpansion relief valve is offset fromthe cylinder for ease of access.

4. The expansion relief valve should beeither horizontal or upright - if fittedinverted, debris may be depositedon the seat and cause fouling of theseat when the valve operates.Check direction of flow arrows.

5. The black plastic plug in the body isa pressure gauge connection toenable pressure monitoring to becarried out, should the systemdevelop a fault. It is recommendedthat this be accessible.

4.3 Expansion VesselA suitable expansion vessel with a pre-charge pressure of 3bar is supplied forfitting to all cylinders.

The supplied expansion vessel must beconnected into the cold water supplybetween the expansion relief valve (inthe inlet manifold) and the cylinderusing the flexible hose provided.Flexible hose not supplied with 50 litreexpansion vessel. This vessel to beconnected using rigid pipe. Theexpansion vessel must be positionedwith the entry point at the bottom. Novalve should be fitted between theexpansion vessel and cylinder.

The air charge pressure in theexpansion vessel must be regularlychecked (e.g. at every service) andtopped up as necessary. The correct aircharge pressure is 3.0bar.

Refer to Sections 7.1 and 7.5 for furtherdetails.

4.4 Temperature and PressureRelief ValveThe temperature and pressure reliefvalve (T&P Valve) is supplied factoryfitted to the cylinder. The T&P valvemust not be removed from the cylinderor tampered with in any way. The valveis pre-set to lift at 7bar or 90°C andany attempt to adjust it will invalidatethe warranty.

4.5 Hot Water Supply1. Connect the hot water supply pipe

to the top outlet (1) of the cylinder.

4.6 Prevention of ScaldingBuilding Regulations ApprovedDocument G (Part G3) requires that thehot water temperature supplied to abath should be limited to a maximum of48°C by using an in-line blending valve(not supplied with the cylinder) with amaximum temperature stop. The lengthof the supply pipe between theblending valve and the bath hot wateroutlet should be kept to a minimum toprevent the colonisation of waterbornepathogens (e.g. legionella). Refer toApproved Document G for furtherdetails.

6. Expansion relief drain pipeworkmust be connected to a safe visibledischarge point via a tundish andthe pipework must have acontinuous fall. Connect theExpansion Relief valve outlet intothe discharge pipe from theTemperature and Pressure Reliefvalve using a 15mm copper pipeand tee piece (not supplied). Fit theTundish below this tee piece usinga short length of copper pipe. Referto Sections 4.7, 4.8 and 4.9 forfurther information on Tundish andDischarge pipe.

7. The pressure reducing valve hastwo outlets, the second one is for abalanced cold water supply, to ashower or a bidet (over rim typeonly, ascending spray typerequires type AA, AB or AD airgap). Major shower manufacturersadvise fitting a mini expansionvessel in the balanced coldsupply to accommodate thermalexpansion and prevent tighteningof shower controls. If thedwelling has a shower mixingvalve (manual or thermostatic) ora Bidet (over rim type) use thecold water supply from theBalanced Cold water connectionon the Inlet Manifold for theseoutlets. Do not use the balancedcold connection to supply bathtaps as this can reduce the flowof water available to the cylinder.If the balanced cold water outlet isnot required, blank off the port.

The Benchmark book enclosed withthe cylinder should be completedafter commissioning of the system.

The cylinder must be registeredwith Grant UK within 30 days ofinstallation. Refer to Section 11 forfurther details on the CylinderWarranty.

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4.8 Tundish The tundish must not be positionedabove or in close proximity of anyelectrical current carrying devices orwiring.

4.9 Discharge Pipe1. The discharge pipe from the

Tundish should terminate in a safeplace where there is no risk topersons in the vicinity of thedischarge, be of metal and:

a) Be at least one pipe size larger thanthe normal outlet size of the safetydevice unless its total equipmenthydraulic resistance exceeds that ofa straight pipe 9m long, i.e.discharge pipes between 9m and18m equivalent resistance lengthshould be at least larger than thenormal outlet size of the safetydevice, between 18m and 27m atleast three sizes larger and so on.Bends must be taken in to accountin calculating the flow resistance.See Sections 4.10, 4.11 and 4.12.

b) Have a vertical section of pipe atleast 300 mm long, below thetundish before any elbows or bendsin the pipe work.

c) Be installed with a continuous fall of1:40 (2.5°).

d) Have discharges visible at both thetundish and the final point ofdischarge but where this is notpossible or practically difficult thereshould be clear visibility at one orother of these locations.

2. Examples of acceptance dischargearrangements are:

a. ideally below a fixed grating andabove the water seal in a trappedgully.

b. downward discharges at a lowlevel; i.e. up to 100mm aboveexternal surfaces such as car parks,hard standings, grassed areas etc.are acceptable providing that wherechildren may play or otherwisecome in to contact with discharges,a wire cage or similar guard ispositioned to prevent contact,whilst maintaining visibility.

c. discharges at high level; e.g. in tometal hopper and metal down pipewith the end of the discharge pipeclearly visible (tundish visible or not)or onto a roof capable ofwithstanding high temperaturedischarges of water and 3m from

any plastics guttering systems thatwould collect such discharges(tundish visible).

3. Where a single pipe serves anumber of discharges, such as inblocks of flats, the number servedshould be limited to not more than6 systems so that any installationcan be traced reasonably easily.The single common discharge pipeshould be at least one pipe sizelarger than the largest individualdischarge pipe to be connected. If unvented hot water storagesystems are installed wheredischarges from safety devices maynot be apparent i.e. in dwellingsoccupied by blind, infirm or disabledpeople, consideration should begiven to the installation of anelectronically operated device towarm when discharge takes place.

Note:The discharge will consist ofscalding water and steam. Asphalt,roofing felt and non-metallicrainwater goods may be damagedby such discharges.

Balanced cold supply for showersor bidet only (see Section 4.2)

Secondaryreturn line

Circulationpump

Non returnvalve

Cold inlet

Balanced coldsupply outlet

Figure 4-1: Secondary Return Circuit

Note:If a secondary circulation circuit is installedthen a larger expansion vessel may berequired to handle the increase in volume.

4.7 Secondary ReturnAll DuoWave solar and HP cylinders are fitted with a secondary return connection. If a secondary return circuit is required it should beconnected to the DuoWave solar or HP cylinder as shown below:

Sec

ond

ary

Cir

cuit

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4 Secondary Circuit Installation4.10 Discharge Pipe Arrangement

Figure 4-2: Typical discharge pipe arrangement

Safety device ( e.g.temperature relief valve)

Metaldischargepipe fromtemperature

Metal discharge pipe from tundishwith continuous fall. See table andworked example on next page

discharged belowfixed grating

Fixed grating

Trapped gully

Tundish

600mm max

300m

m m

in

4.12 Worked ExampleThe example below is for a 1/2”diametertemperature relief valve with adischarge pipe (D2) having 4 elbowsand a length of 7 m from the tundish tothe point of discharge.

FromMaximum resistance allowed for astraight length of Ø22mm copperdischarge pipe (D2) from a 1/2” diametertemperature relief valve is - 9.0m.

Subtract the resistance for quantity of 4Ø22mm elbows at 0.8m each = 3.2m.Therefore, the maximum permittedlength equates to 5.8m.

5.8m is less than the actual length of7m; therefore calculate the next largestsize.

Maximum resistance allowed for astraight length of Ø28mm-pipe (D2)from a 1/2” diameter temperature reliefvalve equates to - 18m.

Subtract the resistance for a quantity of4 Ø28mm elbows at 1.0 each = 4m.

Therefore the maximum permittedlength equates to 14m.

As the actual length is 7m, a Ø28mmdiameter copper pipe will besatisfactory.

4.11 Discharge Pipe Sizing

Max resistance allowed,Minimum size of expressed as a length Resistance created

Valve outlet size, Minimum size of discharge pipe D2 from of straight pipe, i.e. no by each elbow or diameter (inches) discharge pipe D1 (mm) tundish in (mm) elbows or bends bend in (m)

22 Up to 9 0.81/2 15 28 Up to 18 1.0

35 Up to 27 1.4

28 Up to 9 1.03/4 22 35 Up to 18 1.4

42 Up to 27 1.7

35 Up to 9 1.41 28 42 Up to 18 1.7

54 Up to 27 2.3

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All electrical wiring must be carriedout by a competent person and inaccordance with the current I.E.E.Wiring Regulations.

The control equipment supplied willensure that the cylinder functions safely.From an economic and conveniencepoint of view, it is intended that thesecontrols operate in conjunction withother control packages for example “S”,“W” or “Y” plan type systems, whichincorporate a programmable time clock,etc.

5.1 Immersion Heater All cylinders are supplied fitted witheither one or two immersion heaters,dependent on the model and capacity.

Each 3kW 230V 50Hz-immersionheater should be wired in accordancewith the instructions given in Figure 5-1.

The cable must be routed through the strain relief bush. The controlthermostat is pre-set at approximately60°C. The immersion heater conformsto EEC Directive 76/889 for radiointerference and complies with EN60335-2-73.

Installation and wiring instructions forthe immersion heater are supplied witheach unit. Follow the wiring instructionsconnecting the live, neutral and earth asindicated.

The unit must be permanentlyconnected to the electrical supplythrough a double-pole isolator. A safetycut-out is also incorporated within thethermostat and is factory set to operateat 80°C ± 5°C.

IMPORTANTBefore resetting the safety cut-out oraltering the thermostat setting, isolateelectrical supply to the unit prior toremoval of the cover. Investigate andidentify the cause of the cut-outoperation and rectify the fault beforemanually resetting the cut-out bypressing in the reset button. Ensure thecover to the immersion element isreplaced correctly and the retaining nutis fitted. Finally switch the mainselectricity supply back on.

Figure 5-1: Immersion heater wiringconnections

= Earth (Green/Yellow)= Live (Brown)= Neutral (Blue)

Temperaturecontrol dial

Reset

This appliance must be earthed.

! WARNING

The manual re-set high limitthermostat must not under anycircumstances be bypassed. This is pre-set to 80°C and to preventnuisance tripping the controlthermostat should always be left inposition 4.

! WARNING

d) The BEAB approval certification onthis immersion heater only applies ifa Cotherm TSE rod type thermostatsis used. The temperature setting ofthe control thermostat shouldalways be left in position 4.

5.3 Dual Thermostat (IndirectTemperature Control) For the Indirect models two DualThermostats (each a combined controland high limit thermostat) are suppliedseparately with the unvented hot watersafety kit. One is fitted into the uppersensor pocket in the cylinder (seeFigures 2-4 to 2-6 for position) tocontrol the operation of the boiler orheat pump primary coil. The second isfitted in the lower sensor pocket tocontrol the operation of the Solar coil.For Direct models only one DualThermostat is supplied to be fitted inthe lower sensor pocket.

The control thermostat has anadjustment range between 25°C and65°C, however it is recommended thatit is set to 60°C. The overheatthermostat incorporated within the dualthermostat will operate at 90°C.

5.4 2-Port Valve (Indirect only)To comply with regulations governingthe installation of indirect unventedcylinders, a 2-port motorised valvemust be fitted in the primary flow toprevent gravity circulation when theboiler switches off. Your GrantDuoWave unit has been supplied with a2-port motorised valve, which will actas a positive energy cut-out should thesafety cutout operate. Should thishappen the motorised valve will operateand close down the primary flow to thecylinder. The valve should be wired inaccordance with Figures 5-3, 5-5,5-7, 5-9 or 5-11 depending on systemdesign, to comply with currentlegislation.

For an air source heat pump (other thana Grant Aerona heat pump) consult theheat pump manufacturer for connectiondetails.

This motorised valve will also controlthe temperature of the domestic storedwater via the cylinder thermostat, whichis located in the upper dual thermostat.The unit should be installed on a “W”,“S” or “Y” plan system as shown inFigures 5-2, 5-4 and 5-6.

5.2 Immersion Heater WiringInstructions a) Ensure the main’s voltage

corresponds to the voltage rating of the immersion heater as shownon the rating label on the terminalcover.

b) The immersion heater is factoryfitted to the cyinder. If theimmersion heater needs to bereplaced it must be fitted to thecylinder using the gasket providedon the unit. Use a shaped spanner,Stillsons or pipe grips should not beused. The use of sealing compoundis not recommended.

c) Wire the immersion heater inaccordance with the wiring diagram(Figure 5-1). It should be wiredthrough a double pole isolator switch or controller, with a minimumbreak capacity of 13 amp havingcontact separation of at least 3mm, using 1.5mm sq. flexible cable,85°C rubber insulated HOFRsheathed, to comply with BS 6141table 8 and must be fully earthed.

5 Electrical Installation

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5 Electrical Installation5.5 ‘W’ Plan System Schematic and Wiring Diagram - DuoWave Indirect Solar Cylinder and Boiler

Figure 5-2: ‘W’ Plan system schematic

Figure 5-3: ‘W’ Plan wiring diagram

Boiler

230V50Hz

RoomThermostat

L N E

2

1

C C

12

1 2 3 4 5 6 7

N E L

N E L

N

HW

HTG

L

8 9 10

2

1 3

Radiator

Pump

3 port diverter valve(not supplied)

3 port divertvalve (notsupplied)

Blue

Blue

Brown

Brown

Green/Yellow

2 port zone valve(supplied)

2 portzone valve(supplied)

Note:Orange and grey wires notrequired electrically isolate

High limit Control

Junction box

Time controller

Boiler

Pump

Grant DuoWave Indirectwater cylinder

Cylinder DualThermostat(Top Coil)

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5.6 ‘Y’ Plan System Schematic and Wiring Diagram - DuoWave Indirect Solar Cylinder and Boiler

Figure 5-4: ‘Y’ Plan system schematic

Figure 5-5: ‘Y’ Plan wiring layout

Boiler

Radiator

Pump


3 port mid-positionvalve (not supplied)


230V50Hz

RoomThermostat

L N E

2

1

C C

12

1 2 3 4 5 6 7

N E LN E L

N

HW

On

HW

Off

HTG

L

8 9 10

2

1 3

Mid positionzone valve

White

Blue

Grey

Blue

Orange

BrownGreen/Yellow

2 portzone valve(supplied)

Green/Yellow

Note:Orange and grey wires notrequired electrically isolate

High limit Con trol

Cylinder DualThermostat (Top Coil)

Junction box

Time controllerBoiler

Pump

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5 Electrical Installation

Figure 5-7: ‘S’ Plan wiring layout

5.7 ‘S’ Plan System Schematic and Wiring Diagram - DuoWave Indirect Solar Cylinder and Boiler

Figure 5-6: ‘S’ Plan system schematic

Boiler

Radiator

Pump



2 port diverter valve (not supplied)


230V50Hz

RoomThermostat

L N E

2

1

C C

12

1 2 3 4 5 6 7

N E L

NE

LN

HTGHW L

8 9 10

2

1 3

Zone valveDHW

Zone valveHTG

BlueBrown

Green/Yellow

Grey

Orange

Grey

Orange

BlueBrown

Green/Yellow

High limit Con trol

Junction box

Time controller Boi

ler

Pump

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5.8 ‘S’ Plan System Schematic and Wiring Diagram - DuoWave HP Cylinder and Heat Pump

Figure 5-8: ‘S’ Plan system schematic - for Grant Aerona heat pump

Grant AeronaHeat pump(with integralcirculating

pump)

Radiator


Grant DuoWave HPwater cylinder

2 port diverter valve (not supplied)


Grant Aerona HeatPump ControlsConnection

230V50Hz

RoomThermostat

L N E

2

1

C C

12

1 2 3 4 5 6 7

N

HTGHW L

8 9 10

2

1 3

Zone valveDHW

Zone valveHTG

BlueBrown

Green/Yellow

Grey

Orange

Grey

Orange

BlueBrown

Green/Yellow

High limit Con trol

Junction box

Time controller

3

2

1

HW

CH

C

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5 Electrical Installation5.9 Solar Thermal Schematic and Wiring Diagram

Figure 5-10: Solar thermal schematic

Figure 5-11: Solar thermal system typical wiring layout

ElectricalJunction Box

Grant GSD1Controller

2 port or solenoidvalve (Not supplied)

Solar CirculatingPump

SolarCollector

Solar PumpStation

Dual Thermostat

CylinderTemperatureSensor

Collectorsensor

Cylinderbottom sensor

N

230V

GND

Sensor

Solar pump

N E L

N E L

Solenoidvalve

Dual thermostat(Solar coil)

230V 3A fused supply

LNE

12345678910

111213141516171819202122

Grant GSD1 Mk2 Controller

1

C C

12 2

C ontrolHigh Limit

Com

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6 Commissioning, Draining Down & Safety6.1 Filling the CylinderIMPORTANTBefore filling the cylinder check that theimmersion heater has not loosened intransit. Tighten as necessary using ashaped spanner. Stillsons or pipe gripsshould not be used.

1. Open all hot water taps.

2. Turn on the stop cock.

3. When water flows from all taps close the taps.

4. Allow system to stabilise for five minutes.

5. Open each hot water tap in turn to expel air from the system pipe work.

6. Check for leaks.

7. Manually operate Temperature andPressure Relief Valve (16) - Figures2-4 to 2-6, to ensure free waterflow through discharge pipe. (Turnknob to left).

6.2 Draining DownSwitch the electrical power off(important to avoid damage to element).Isolate boiler from DuoWave unit.

Turn off the cold water supply valve(stop cock). Open hot water taps. Opendrain (20) - Figures 2-4 to 2-6. The unitwill drain.

6.3 Safety Cut-Out1. The safety cut-out operates if:

a. Wiring is incorrect.

b. The immersion heater thermostat orcylinder thermostat fails.

c. Thermostat is set too high.

2. Remember before resetting thesafety cut-out or altering thethermostat setting, isolate electricalsupply to the unit prior to removalof the electrical box lid.

3. Reduce thermostat setting andpress the reset button. Afteradjustments are completed, ensurethe lid to the electrical box isreplaced correctly and the retainingscrew is fitted.

4. If the problem persists, pleasecontact your installer in the firstinstance.

6.4 Cold Water Discharge fromTundishThere are two reasons why cold waterwill discharge from the tundish:

1. The pressure reducing valve hasmalfunctioned (This will cause alarge volume of water to flowthrough the tundish).

2. The Expansion relief valve is lettingby (This will cause a very lowvolume of water to flow through the tundish).

In both cases, identify the defectivecomponent and replace. All repairsmust be carried out by a competentperson.

6.5 Hot Water Discharge fromTundishThere are four reasons why hot waterwill discharge from the tundish:

1. Thermal cut-out has malfunctioned.

2. The control thermostat hasmalfunctioned.

3. The T & P valve is letting by.

4. The expansion vessel has failed orlost its charge.

In all cases, should a repair benecessary, the work must be carriedout by a competent person.

Isolate the cylinder from all electricalsupplies before commencingmaintenance work.

6.6 Expansion Vessel1. The expansion vessel is connected

into the cold water supply to thecylinder using the flexible hose.Flexible hose not supplied with 50litre vessel. This vessel is connectedusing rigid pipe. Refer to Section4.3.

Note:No valve should be fitted betweenthe expansion vessel and thesupply pipe.

2. Ensure that the air charge in thevessel matches the pressure settingshown on the pressure reducingvalve.

3. The expansion vessel must beinstalled even if an accumulator isfitted.

4. The charge of the vessel must bechecked at every annual service.

6.7 Customer Handover1. Complete the Benchmark book

supplied with the Cylinder and leaveit with the User.

2. Explain the operation of the systemto the User, referring to Section 10of these instructions.

3. In particular, make the User awareof what to do if water is seen toflow from either the T&P Valve orExpansion relief Valve. Refer User tothe Information given in Section 10.

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7 Maintenance7.1 Servicing and Maintenance1. Servicing and maintenance must

only be carried out by a competentunvented hot water installer, or byGrant Engineering (UK) Limitedauthorised personnel.

2. Before any work whatsoever iscarried out on the installation, itMUST first be isolated from themain’s electricity supply.

Both the primary and secondarysystems will contain very hot waterthat will scald; therefore care shouldbe taken when opening any joints,seals or valves.

3. Only use spare parts authorised byGrant Engineering (UK) Limited. Theuse of unauthorised spare parts willinvalidate the warranty.

4. Drain the cylinder – When drainingthe cylinder, always switch off theboiler and the immersion heaterfirst. Turn off the water supply at themains stopcock.

Connect a hose pipe to the draincock (see Figures 2-4 to 2-6) androute it to a convenient gully. Openthe drain cock and all hot taps thatare served by the cylinder. Thecylinder may take several minutes toempty completely.

5. In hard water areas it may benecessary from time to time toremove and de-scale the immersionheater element. Replace the gasketeach time it is removed.

6. Remove the cartridge from thepressure-reducing valve (PRV).Check the strainer and if necessaryremove any debris from in front ofit. Replace the cartridge. Refer tosection 7.3 on the right.

7. Check the charge pressure in theexpansion vessel and top up asnecessary. The charge pressureshould be 3.0bar. Refer to section7.5 on the right.

! WARNING

8. Whilst the hose pipe is connected, thedrain cock open and with theimmersion heater removed, thecylinder may be flushed out to removeany debris, sand or lime scale particlesthat may have collected in the bottomby using a further hose pipeconnected to the cold water main.

9. Close the drain cock, disconnectthe hose, refit the immersion heaterand close all hot water taps beforereopening the stopcock. Allow thecylinder time to fill whilst checkingfor any leaks. Release any air fromthe system by opening each hotwater tap individually, starting withthe one furthest from the cylinder.

10. Manually lift the expansion relief andtemperature and pressure reliefvalve one at a time, every 12months (more frequently in hardwater areas) to prevent debris frombuilding up behind the valve seat.Whilst carrying out this operation,check that the discharge to wasteis unobstructed. Check that eachvalve seals correctly when released.As the valves are pre-calibrated,they require no further maintenance.

11. Finally switch on the mainselectricity supply to the immersionheater and the boiler. As the systemheats up, check again for any leaksand rectify as necessary.

7.2 Manifold AssemblyThe manifold assembly should not,under normal circumstance, require anymaintenance. During annual servicing itmay be necessary to inspect and/orclean the line strainer, the pressurereducing valve cartridge, expansionrelief valve cartridge. The frequency ofcleaning will depend on the local waterconditions.

7.3 Pressure Reducing Valve1. Isolate the cold water supply.

2. Unscrew the retaining nut of thevalve. The complete operatingmechanism, including the strainercan be removed.

3. Clean the filter mesh and thecartridge under running water.

4. Replace cartridge ensuring thatstrainer is correctly located andreassemble the unit. PressureReducing Valve cartridge andstrainer Part No. GCS07C - 3.0 bar.

7.4 Expansion Relief ValveCartridge1. Isolate the cold water supply.

2. Remove grub screw (Allen Key type) from body of valve andwithdraw valve ensuring not todamage O-ring.

3. Clean valve seat face and seating -do not scratch or damage eitherseat face or seating.

4. Refit in reverse order. Do notovertighten. Expansion valvecartridge Part No. GCS08.

7.5 Expansion Vessel1. Isolate the cold water supply.

2. Open hot water taps.

3. Drain cylinder to below tee piecetake off for expansion vessel flexiblehose.

4. Replace expansion vessel after firstchecking the air charge (and hose ifrequired).

5. Close drain off cock and turn oncold water supply.

6. When water is flowing freely fromtaps close taps.

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8.1 Intermittent Water Discharge

Intermittent Water Discharge from T & P Valve

Expansion VesselCharge Reduced

Test for correct operation. If water is still discharging, contact a competent Engineer

Thermostat Failure

Test Vessel andRecharge or Replace

Immersion ThermostatFailure

Primary CylinderThermostat

Faulty T & P Valve

Repair or ReplaceImmersion Thermostat

Repair or ReplaceThermostat

Replace T & P Valve

No

Yes

Yes Yes Yes

No No

8 Fault Finding Guide

8 Fault Finding Guide

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8.2 Constant Water Discharge

Constant Water Discharge from T & P Valve

Expansion VesselCharge Reduced

Test for correct operation. If water is still discharging, contact a competent Engineer

Test Vessel andRecharge or Replace

Faulty T & P Valve

Faulty PressureReducing Valve

Replace T & P Valve

Replace PressureReducing Valve

No

YesYes Yes

Yes Yes

No No

8.3 No Flow from Hot Water Taps

No Flow from Hot Water Taps

Mains SupplyDisconnected?

Test for correct operation. If water is still not flowing, contact a competent Engineer

Open supply valve orwait for supply to be

reconnected



Clean Line StrainerRepair or Replace

Thermostat

No

YesYes Yes

Yes Yes

No No

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8.4 Cold Water Flow from Hot Water Taps

Cold Water from Hot Water Taps

Is Programmer callingfor Hot Water?

Check and Set HotWater setting

Is Motorised Valveworking?

Is Boiler working?

Is Cylinder Stat Calling for Heat?

Check Motorised Valvemotor and Micro-switch

Yes

No No No

No Yes

Yes

Yes

Yes

Test for correct operation. If water is still cold, contact a competent Engineer

Has Thermal Cut-OutOperated?

Check and Reset Button

Check and ReplaceCylinder Thermostat

No

Yes

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8 Fault Finding Guide8.5 Excessive Hot Water from Taps

Excessive Hot Water from Taps

Is Cylinder Thermostatset too high?

Reduce ThermostatSetting

Is System Wiringcorrect?

Correct Wiring as per instructions

Is Cylinder ThermostatOperating?

Replace CylinderThermostat

No

Yes Yes

Yes

No

No

Test for correct operation. If water is still cold, contact a competent Engineer

Does Motorised Valveclose when Thermostat

is satisfied?

Repair or ReplaceMotorised Valve Motor

Repair or ReplaceMotorised Valve

Fault. Contact Engineer

Yes

No

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9 Spare Parts9.1 Spare Parts

Figure 9-1: Pressure Reducing Valve(Cartridge and Strainer) - 3 bar

Figure 9-3: Inlet Manifold includingpressure reducing valve, expansionrelief valve

Figure 9-5: Flexible Hose

Figure 9-2: Tundish

Figure 9-6: Expansion Vessel

Part Name Part No.

Pressure Reducing Valve - 3 bar GCS32

Expansion Relief Valve - 6 bar GCS08

Flexible Hose - 3/4" BSPF x 3/4" BSPM GCS021/2" Temperature & Pressure Relief Valve 90˚C/7 bar GCS09

Tundish - 15mm/22mm Compression GCS10

Coil Control/Limit Thermostat GCS11

Immersion Heater Element - Cotherm type ELE14-IN-800-UNV GCS30

Drain Cock GCS14

Immersion Heater Thermostat - Cotherm type TSE GCS31

Motorised Valve GCS16

Expansion Vessel 19 litre nominal (170, 200 & 250 models)* (18 litre actual vol) - 3/4" BSPM connection GCS24

Expansion Vessel 24 litre nominal (300 model)* (22 litre actual vol) - 3/4" BSPM connection GCS25

Expansion Vessel 35 litre nominal (400 model)* (35 litre actual vol) - 3/4" BSPM connection GCS28

Expansion Vessel 50 litre nominal (500 model)* (50 litre actual vol) - 1" BSPM connection GCS27

1" BSPF x 3/4" BSPM Adaptor - for 35 litre Expansion Vessel GCS33

Inlet Manifold c/w 3 bar Pressure Reducing Valve and 6 bar Expansion Relief Valve GCS07

*All pre-charged to 3 bar

DuoWave Indirect Cylinder Spare Parts

Figure 9-4: Expansion Relief Valve(Complete) - 6 bar

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10 User Instructions10.1 User Instructions1. Your Grant DuoWave Solar or

DuoWave HP unvented hot watercylinder has been designed to givemany years of trouble-free serviceand is made from hygienic highgrade stainless steel. The Indirectmodels include two 3 kW electricimmersion heaters for times whenyour central heating or heat pump isswitched off, during the summer forinstance.

2. The flow temperature of the hotwater can be set to yourrequirements on the immersionheater up to 60°C and the indirectsystem dual thermostat up to 65°C.These temperatures should not beset any higher otherwise nuisancetripping of the high limit thermostatwill occur. If you are in any doubt,these adjustments should be bestleft to a qualified electrician.

3. When a hot tap is turned on theremay be a short surge of water, this isquite normal with unvented systemsand does not mean there is a fault.

4. When you first fill a basin the watermay sometimes appear milky. Thisis due to very tiny air bubbles in thewater, which will clear very quickly.

If water is seen to flow from either theTemperature & Pressure Relief (T&PValve) valve or the Expansion ReliefValve (EV) on the cylinder seek expertadvice immediately.

If the water is flowing from the T&PValve, immediately:

Shut off the electrical supply to theimmersion heater(s)

Shut down the boiler

Switch off ALL other heat sources tothe cylinder e.g. solar, heat pump, etc.

DO NOT SHUT OFF THE WATERSUPPLY TO THE CYLINDER.

Contact your installer to check thesystem.

IMPORTANTDo NOT tamper with any of the Safetycontrols fitted to the cylinder. If yoususpect a fault always contact aCOMPETENT installer who isQUALIFIED to work on unventedwater cylinders.

! WARNING

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11 Warranty11.1 The Grant CylinderWarrantyDear CustomerYou are now the proud owner of aGrant Cylinder from Grant Engineering(UK) Limited, which has been designedto give you years of reliable, trouble freeoperation.

Grant Engineering (UK) Ltd. guaranteesall electrical and mechanicalcomponents supplied with the cylinderfor a period of two years from the dateof purchase. In addition, the stainlesssteel used in the manufacture of thecylinder is guaranteed for a period oftwenty five years with the manufacturingprocess of the cylinder guaranteed fortwo years from the date of purchase,provided that the cylinder is installed infull accordance with the installationinstructions provided and the system isserviced after twelve months operation.(see Terms and Conditions).

ImportantPlease register your Grant cylinder withGrant UK within thirty days of theinstallation as follows.

Visit www.grantuk.com and follow thelinks to the 'Householder zone' whereyou can register your cylinder for afurther one year warranty (giving twoyears from the date of purchase). Thisdoes not affect your statutory rights.

Breakdown during theManufacturer’s WarrantyIf your Grant Cylinder should fail duringthe first two years, you must contactGrant Engineering (UK) Limited, who willarrange for the repair under the termsof their Warranty, providing that thesystem has been correctly installed andcommissioned, serviced (if older thantwelve months) and the fault is not dueto misuse, or the failure of any externalcomponents not supplied by Grant UK(e.g. pipework, etc.). This extended twoyear warranty only applies if the cylinderis registered with Grant UK within thirtydays of installation.

In the first Instance:Contact your installer or commissioningengineer to ensure that the fault doesnot lie with the system or any othercomponents, or any incorrect setting ofthe system controls.

If a Fault is Found:Ask your installer to contact GrantEngineering (UK) Limited, ServiceDepartment on 01380 736920 who willarrange for a qualified service engineerto attend to the fault.

Free of Charge Repairs:During the first two years no charge forparts or labour will be made providingthat the Cylinder has been installed andcommissioned correctly in accordancewith the manufacturer’s instructions,servised at twelve month intervals andthe cylinder was registered with GrantUK within thirty days of installation.Proof of ‘purchase’ date must beprovided upon request.

Chargeable Repairs:A charge will be made if the cause ofthe breakdown is due to any of thefollowing:

• Faults caused by the plumbing orheating system, external electricsand external components.

• The Grant Cylinder has not beencommissioned, or serviced inaccordance with the installationand servicing manual.

• The system has been installed forover two years.

Remember before you contactGrant:Please register your Grant cylinderwithin thirty days of the installation.

Terms of Manufacturer’s Guarantee1. The Grant Cylinder guarantee starts

from the date of purchase.

2. All electrical and mechanicalcomponents supplied with theGrant Cylinder are guaranteed for aperiod of two years. The stainlesssteel used in the manufacture of thecylinder is guaranteed for a periodof twenty five years with themanufacturing process of thecylinder guaranteed for two years.

3. The cylinder is registered within 30days of installation. Failure to do sodoes not affect your statutoryrights.

4. The Grant Cylinder must be installedby a competent/licensed installerand in accordance with the Codes ofPractice and Regulations in force atthe time of the installation.

5. The Grant Cylinder and itscomponents must not have beenmodified or tampered with.

6. The installation must be servicedevery twelve months as per theinstallation instructions. (Receiptsshould be kept as proof).

7. The Grant Cylinder must beconnected to a mains water supply(installations utilising a private watersupply are not covered by thisguarantee).

8. Breakdown/failure due to lime-scalewill not be covered by thisguarantee.

9. The Grant Cylinder must not besited in a location where it may besubjected to frost.

10. All claims under this guaranteemust be made to Grant Engineering(UK) Ltd prior to any work beingundertaken. Proof of purchase anddate of installation must beprovided on request. Invoices forcall out/repair work by any thirdparty will not be accepted unlesspreviously authorised by GrantEngineering (UK) Ltd.

11. This guarantee is transferableproviding the installation is servicedprior to the dwelling’s new ownerstaking up residence. GrantEngineering (UK) Ltd must beinformed of the new owner’s details.

12. Grant Engineering (UK) Ltd willendeavour to provide prompt servicein the unlikely event of a problemoccurring, but cannot be heldresponsible for any consequence ofdelay however caused.

13. This guarantee applies to GrantCylinders installed on the UKmainland, Isle of Man and ChannelIslands only. Provision of in-warrantycover elsewhere in the UK issubject to agreement with GrantEngineering (UK) Ltd.

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11.2 Extended WarrantyFor further peace of mind GrantEngineering (UK) Ltd offer the option toinsure all the components of your GrantCylinder for a further three years,following on from the two year productwarranty period. For a single premiumpayment (inclusive of InsurancePremium tax) you get five years ofprotection against breakdown costs. Atthe end of this period you will have theopportunity to continue this cover on anannual basis.

To access full details and an applicationform for this extended cover, first visitwww.grantuk.com.

Follow the links to the ‘HouseholderZone’, register your Cylinder for afurther one year product warranty(giving two years from the date ofpurchase), and then download theextended warranty details andapplication form.

Please note that this special offer is onlyavailable if the application form issubmitted to Bluefin Insurance ServicesLtd. within three month of theinstallation date.

11 Warranty

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Notes

GRANT ENGINEERING (UK) LTDHopton House, Hopton Industrial Estate, Devizes, Wiltshire. SN10 2EU

Telephone: 01380 736920 Fax: 01380 736991Email: [email protected] Website: www.grantuk.com

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