Grant DuoWave Plus SystemTriple Coil Solar Cylinder Range

Installation & User Instructions

Part No. IRL 21. Rev 00. June 2011

Storage Cylinder

Do not fit on a well or borehole supply

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Contents1 Introduction &

General Requirements 31.1 Installation Requirements 3

1.2 Location 3

1.3 Storage and Handling 3

1.4 About Your New Cylinder 3

1.5 Open Vented Hot Water Systems 3

1.6 Pipework Connections 3

1.7 Scaling 3

1.8 Insulation 3

1.9 Health and Safety 3

2 Technical Specifications 42.1 Technical data 4

2.2 Dimensions 5

2.3 Connections and Controls 6

3 Primary Circuit Installation 73.1 Grant DuoWave Plus Cylinders 7

3.2 Boiler Primary Connections 7

3.3 Auxiliary Primary Connections 7

3.4 Hard Water Areas 7

4 Secondary Circuit Installation 84.1 Discharge Pipe Arrangement 8

4.2 Discharge Pipe Sizing 8

4.3 Worked Example 8

4.4 DuoWave Plus 300 9

4.5 Cold Water Storage Cistern (CWSC) 9

4.6 Cold Feed Pipe 9

4.7 Open Vent Pipe 9

4.8 Primary Connections 9

5 Electrical Installation 105.1 Immersion Heater 10

5.2 Immersion Heater Wiring Instructions 10

5.3 Y-plan System 11

5.4 S-plan System 12

5.5 Solar Thermal System 13

6 Commissioning, Draining Down & Safety 146.1 Filling the Cylinder 14

6.2 Draining Down 14

6.3 Safety Cut-Out 14

6.4 Hot Water Discharge from Tundish 14

6.5 Customer Handover 14

7 Maintenance 157.1 Servicing & Maintenance 15

8 Fault Finding 168.1 Intermittent Water Discharge 16

8.2 Constant Water Discharge 17

8.3 No Flow from Hot water Taps 18

8.4 Cold Water Flow from Hot Water Taps 19

8.5 Excessive Hot Water from Taps 20

9 User Instructions 219.1 User Instructions 21

10 Warranty 2210.1 The Grant Cylinder Warranty 22

Notes 23

1 Introduction & General Requirements1.1 Installation RequirementsThank you for purchasing a Grantvented hot water storage cylinder fromour stainless steel cylinder range. Thisinstallation manual must be readcarefully before you begin installing thecylinder.

It is vitally important that you havethe correct cylinder to suit yourapplication and fully read andunderstand the instructionsapplicable to that type of installation.If you are in any doubt, stop andcontact the Grant Technical helplinefor assistance.

This cylinder must be installed by acompetent person in compliance withall current legislation, codes of practiceand local by-laws covering theinstallation of an open vented hot watercylinder, as applicable. Please alsomake sure that any installation complieswith the instructions contained in thisinstallation instruction manual.

1.2 LocationThe unit is designed to be floorstanding, vertically mounted, indoors, in a 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.

The cylinder may stand on any flat andlevel surface without any specialfoundation preparations, provided that it is 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.

1.3 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.

1.4 About Your New Cylinder The DuoWave Plus cylinder has threecoils for connection to Primary heatsources and is available as an OpenVented hot water system applicationonly.

This versions is supplied fitted with asingle 3kW electric immersion heater.

Refer to page 10 for further details onimmersion heaters.

The central heating primary from a‘conventional’ boiler should beconnected to the top 22mm coil, viathe compression connections provided.The bottom coil should be used for theSolar Thermal. A Solid Fuel applianceshould be connected to the middle coil,via the 28mm compression connectionsprovided. Please refer to the appliancemanufacturers installation instructionsfor more information.

1.5 Open Vented Hot WaterSystemsThe cylinder is used as part of an OpenVented hot water system, i.e. fed from acold water storage cistern and fittedwith an open vent pipe. The maximumhead must not exceed 30m.

On no account should any type of valvebe fitted where it would shut off theboiler from any means of expansion forthe system.

Note: The Temperature and Pressurerelief (T&P) valve should be leftconnected to the cylinder (as supplied).As it may still operate due totemperature it should be connected inthe correct manner – refer to guidancegiven in Section 4 of these Instructions.

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1.6 Pipework ConnectionsAll Pipework connections to the cylindermust be made in accordance withFigure 2-2.

1.7 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.

1.8 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.

1.9 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.

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2.1 Technical Data

DuoWave Plus

Model Number 300

Storage capacity (litres) 300

Overall diameter (mm) 580

Overall height (mm) 1745

Weight empty (kg) 57

Weight when full (kg) 357

Secondary return connection (mm) 22

Cold feed/hot draw-off connections (mm) 22

Top/bottom coil connections (mm) 22

Top/bottom coil pipe diameter (mm) 22

Middle coil connections (mm) 28

Middle coil pipe diameter (mm) 28

Top coil length (m) 5.84

Top coil surface area (m²) 0.52

Middle coil length (m) 5.70

Middle coil surface area (m²) 0.52

Bottom (solar) coil length (m) 8.01

Bottom (solar) coil surface area (m²) 1.14

Dedicated solar volume Vs (litres) 150

Maximum water supply pressure (bar) 3

Temp & pressure relief valve lift pressure (bar) 7

Temp & pressure relief valve lift temperature (°C) 90

Maximum primary circuit working pressure (bar) 3

Performance:

Top coil rating (kW) 11.6

Top coil recovery rate (mins)* 26

Middle coil rating (kW) 8.5

Bottom coil rating (kW) 16.0

Standing heat loss (kW)** 2.71

Check list:

Cylinder assembly 300 litre 1

Temp & pressure relief valve (7 bar 90ºC) factory-fitted 1

Tundish 15/22mm 1Drain cock (1/2" end feed) 1

Dual thermostat (Control 25-65ºC High limit 90ºC) 2

Immersion heater 3 kW (13/4" boss) factory-fitted 1

* Recovery rate is based on 82°C flow @0.2 l/s over a 50˚C temperature rise for 75% of contents.

** Test carried out at 60˚C.

2 Technical Specifications

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Dims Model(mm) 300

A 210

B 260

C 325

D 390

E 470

F 970

G 1110

Dims Model(mm) 300

H 1160

I 1210

J 1225

K 1470

L 1695

M 1745

Dia 580

DuoWave Plus Indirect Cylinder Dimensions

2.2 Dimensions

Figure 2-1: DuoWave Plus indirect solar cylinder dimensions Dia

ABCDEFGKL HIJ

40˚ 30˚ 22mm Hot waterdraw off

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

22mm Secondaryreturn

22mm Boilerreturn

13/4" Immersion heater(factory fitted)

Boiler stat pocket

22mm Cold waterinlet

22mm Boiler flow

22mm Solar return

22mm Solar flow

Solar stat pocket

28mm Gravity flow

28mm Gravity return

0˚30˚

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2 Technical Specifications

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DuoWave Plus Open Vented Cylinder Details

1

17

18

19

2

3

4

56

13

7

8

9

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1211

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 Solar heat source return tapping 22mm compression

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

9 Cold water inlet 22mm compression

10 Solar heat source flow tapping 22mm compression

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

12 Solid fuel (uncontrolled) flow tapping 28mm compression

13 Solid fuel (uncontrolled) return tapping 28mm compression

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

18 Tundish 15/22mm compression

19 Discharge pipe (not supplied with cylinder) -

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

21 Drain cock (supplied with cylinder) -

Note:Pipework between items 17 and 18 not supplied with cylinder.

Figure 2-2: Cylinder connections and controls

2.3 Connections and Controls

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3 Primary Circuit Installation3.3 Auxiliary PrimaryConnectionsSolar Heating

The Solar flow and return connectionsshould be made to the bottom 22mmcoil connections. Refer to Figure 5-8.

Other Heat Sources

A third primary heat source should beconnected to the middle coil using the28mm compression connections.Please refer to the installation manualfor that appliance.

IMPORTANT. This diagram is shownas an Illustration of this type ofsystem only. Reference must bemade to the appliancemanufacturers own instructions fordetailed guidance on the installationof any uncontrolled appliance.

3.4 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 themigration of suspended solids in thewater and help prevent the build up oflime scale.

3.1 Grant DuoWave Plus SolarCylindersGrant DuoWave Plus Solar cylinders aresuitable for connecting 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 of90˚ C. If you are in any doubtconcerning the suitability of the boiler,consult the boiler manufacturer.

3.2 Boiler Primary ConnectionsCentral Heating

1. The boiler primary flow and returnconnections should be made to thetop coil connections. The primaryflow and return fittings are 22mmcompression. The valve has 22mmcompression connections.

2. Locate the dual thermostat in thestainless steel pocket (refer toFigure 2-2 for location) and secureusing the retaining screws on thethermostat housing.

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

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4 Secondary Circuit Installation4.1 Discharge Pipe Arrangement

Figure 4-1: 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

4.3 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.

4.2 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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Cold water storage cisternVent pipe

Insulating jacket

Overflowwarning pipe

If feeding a shower cold feedto cylinder should always beabove cold water down servicepipe to prevent scolding

450mm minimum offset

Boilerprimary

Solid fuelprimary

Solarthermal

Breather with filter

Purpose madefully fitted lid

Mains watersupply pipe

with isolatingstop valve

Ball valve withbacking plate

Isolating gate valvesclose to cistern

Cold water down service pipe

Cold water feed to cylinder

Further isolating gate valves canbe fitted at a more convenientlocation if required

To cold water outlet points

To hot wateroutlet points

(Diagram of principals only)

Drain cock

4.4 DuoWave Plus 300 The Grant DuoWave Plus 300 OpenVented Indirect Solar cylinder isdesigned to be used as part of a staticOpen Vented hot water system. Itshould be installed in accordance withBS6700:2006, The Building RegulationsPart L and also the relevant WaterRegulations – i.e. the Water Supply(Water Fittings) Regulations 1999 or theWater Byelaws 2000, Scotland.

Important: This open vented versionof the DuoWave Plus MUST be used ifan ‘uncontrolled’ heat source such asa solid fuel or wood burning applianceis to be connected to the cylinder,along with a ‘conventional’ boiler andSolar Thermal.

The maximum working head for theGrant DuoWave Plus Solar cylinder is30m. Ensure that this is suitable foryour installation before proceeding. Ifyou are in doubt about the suitability ofthe cylinder for the system andappliances concerned then pleasecontact the Grant Technical Helpline forassistance.

Figure 4-1 shows the installation of theDuoWave Plus 300 Indirect Solarcylinder installed as part of an openvented hot water system.

4.5 Cold Water StorageCistern (CWSC)Cisterns should be installed inaccordance with BS6700:2006 and alsothe relevant Water Regulations – i.e. theWater Supply (Water Fittings) Regulations1999 or the Water Byelaws 2000,Scotland.

If the cistern is used to provide coldwater to the hot water supply only, itshould have a capacity at least equal tothe hot water cylinder it is supplying.

4.6 Cold Feed Pipe The cold water feed pipe from theCWSC to the cylinder should be sizedin accordance with BS6700:2006. Thisfeed pipe should not supply water toany other fitting.

Connect the cold feed pipe to the coldinlet connection of the cylinder. Refer toFigure 2-3.

A service valve (quarter turn leveroperated full-bore valve) should be fittedin the feed pipe in a convenient andaccessible position, e.g. adjacent to thecylinder. If required a second service

and cold feed pipe should not beconnected together.

Under no circumstances should thevent pipe from an open vented hotwater cylinder terminate over anycombined feed and expansion cistern(F&EC) connected to a primary circuit orany cistern used for the storage anddistribution of wholesome water.

An OSV pipe should be insulated toprotect it from freezing.

4.8 Primary ConnectionsThe ‘uncontrolled’ heat source shouldbe connected to the middle coil via thetwo 28mm compression connections.

The Solar Thermal primary should beconnected to the bottom coil via thetwo 22mm compression connections,with the Boiler primary connected tothe top coil 22mm compressionconnections.

All primary pipework should beinsulated between boiler and cylinder.

valve can be fitted in the cold water feedpipe located adjacent to the CWSC.

A Drain Cock (DC) must be fitted at thelowest point of this supply pipeadjacent to the cylinder to enabledraining of the pipe and cylinder.

4.7 Open Vent PipeThe cylinder must be installed with anOpen Safety vent (OSV) pipe. This mustbe connected to the hot water outlet onthe top of the cylinder and risecontinuously to terminate over theCWSC. Refer to Figure 4-2.

There should be an ‘offset’ of at least450mm in the OSV pipe to reduce thetendency for thermal circulation andloss of heat from the vent pipe. Refer toFigure 4-1.

The OSV pipe must be of an adequatediameter, the minimum pipe size being22mm.

Important: The OSV pipe MUST bepermanently open with NO obstructions(e.g. no valves fitted). The OSV pipe

H

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Figure4-2: Open vented cylinder

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5 Electrical Installation

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”,or “Y” plan type systems, whichincorporate a programmable time clock,etc.

5.1 Immersion Heater All cylinders are supplied fitted with oneimmersion heater.

The 3kW 230V 50Hz-immersion heatershould be wired in accordance with theinstructions 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.

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.

5.2 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 cylinder. 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.

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5.3 ‘Y’ Plan System Schematic and Wiring Diagram

Figure 5-2: ‘Y’ Plan system schematic

Figure 5-3: ‘Y’ Plan wiring layout

Boiler

Radiator

Pump

Grant DuoWave PlusIndirect water cylinder

3 port mid-position valve (not supplied)

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

Notes:1. Orange and grey wiresnot required electricallyisolate

2. *2 port valve notrequired with open ventedcylinder

High limit Con trol

Cylinder DualThermostat (Top Coil)

Junction box

Time controllerBoiler

Pump

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5 Electrical Installation

Figure 5-5: ‘S’ Plan wiring layout

5.4 ‘S’ Plan System Schematic and Wiring Diagram

Figure 5-4: ‘S’ Plan system schematic

Boiler

Radiator

Pump

Not supplied

Grant DuoWave PlusIndirect water cylinder

2 port diverter valve (not supplied)

Cylinder DualThermostat (Top Coil)

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 Control

Junction box

Time controller Boi

ler

Pump

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5.5 Solar Thermal Schematic and Wiring Diagram

Figure 5-6: Solar thermal schematic

Figure 5-7: Solar thermal system typical hydraulic wiring layout

ElectricalJunction Box

(notsupplied)

Grant GSD1Controller

Twin-coilCylinder

SolarCollector

PumpStation

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 (17) - Figure 2-2, to ensure free water flowthrough discharge pipe. (Turn knobto left).

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

Turn off the cold water supply valve(stop cock). Open hot water taps. Opendrain (21) - Figure 2-2. The unit willdrain.

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 Hot Water Discharge fromTundishThere are three 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.

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.

6.5 Customer Handover1. Explain the operation of the system

to the User, referring to Section 10of these instructions.

2. In particular, make the User awareof what to do if water is seen toflow from either the T&P Valve.Refer User to the Information givenin Section 10.

7 Maintenance

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7.1 Servicing and Maintenance1. Servicing and maintenance must

only be carried out by a competenthot water installer, or by GrantEngineering (IRL) Ltd authorisedpersonnel.

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 (IRL) Ltd. 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 Figure 2-2) and route it to aconvenient gully. Open the drain cockand all hot taps that are served by thecylinder. The cylinder may takeseveral minutes to empty 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.

! WARNING

6. 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.

7. 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.

8. Manually lift the expansion relief andtemperature, every 12 months(more frequently in hard waterareas) 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.

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

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8 Fault Finding Guide8.1 Intermittent Water Discharge

Intermittent Water Discharge from T & P Valve

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

Thermostat Failure

Immersion ThermostatFailure

Primary CylinderThermostat

Faulty T & P Valve

Repair or ReplaceImmersion Thermostat

Repair or ReplaceThermostat

Replace T & P Valve

Yes Yes Yes

No No

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8.2 Constant Water Discharge

Constant Water Discharge from T & P Valve

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

Faulty T & P Valve

Faulty PressureReducing Valve

Replace T & P Valve

Replace PressureReducing Valve

Yes Yes

Yes Yes

No No

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8 Fault Finding Guide8.3 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

Mains SupplyDisconnected?

Repair or ReplaceThermostat

No

YesYes

Yes

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?

Yes

No No

No

No

Yes Yes

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

Check and ReplaceCylinder Thermostat

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8.5 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

Fault. Contact Engineer

8 Fault Finding Guide

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9 User Instructions9.1 User Instructions1. Your Grant DuoWave Plus Solar

vented hot water cylinder has beendesigned to give many years oftrouble-free service and is madefrom hygienic high grade stainlesssteel. All models include a 3 kWelectric immersion heaters for timeswhen your central heating isswitched off, during the summer for instance.

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 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 theTemperature & Pressure Relief (T&PValve) valve on the cylinder seekexpert advice 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, 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 watercylinders.

! WARNING

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10 Warranty10.1 The Grant CylinderWarrantyDear CustomerYou are now the proud owner of aGrant Cylinder from Grant Engineering(IRL) Ltd, which has been designed togive you years of reliable, trouble freeoperation.

Grant Engineering (IRL) Ltd guaranteesall electrical and mechanicalcomponents supplied with the cylinderfor a period of one year 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 forone 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).

Breakdown during theManufacturer’s WarrantyIf your Grant Cylinder should fail duringthe first year, you must contact GrantEngineering (IRL) Ltd, who will arrangefor the repair under the terms of theirWarranty, providing that the system hasbeen correctly installed andcommissioned, and the fault is not dueto misuse, or the failure of any externalcomponents not supplied by Grant IRLLtd (e.g. pipework, etc.).

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 (IRL) Ltd, ServiceDepartment on 057 9120089 who willarrange for a qualified service engineerto attend to the fault.

Free of Charge Repairs:During the first year no charge for partsor labour will be made providing thatthe Cylinder has been installed andcommissioned correctly in accordancewith the manufacturer’s instructions andserviced at twelve month intervals.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 one year.

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 one year. The stainlesssteel used in the manufacture of thecylinder is guaranteed for a periodof twenty five years with themanufacturing process of thecylinder guaranteed for one year.

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 watersupply (installations utilising aprivate water supply are notcovered by this guarantee).

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(IRL) 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 (IRL) Ltd.

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

12. Grant Engineering (IRL) 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 in the Republic ofIreland and Northern Ireland.Provision of in-warranty coverelsewhere is subject to agreementwith Grant Engineering (IRL) Ltd.

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GRANT ENGINEERING (IRELAND) LTDCrinkle, Birr, Co. Offaly, Ireland

Tel: (057) 91 20089 Fax: (057) 91 21060 Email: info@grantengineering.ie www.grantengineering.ieThis manual is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearances are changed in the interests of continued product improvement.

All good sold are subject to our official Conditions of Sale, a copy of which may be obtained on application. © Grant Engineering (Ireland) Limited 2008. No part of this manual may be reproduced by any means without prior written consent.