ECSi210ST-580 - Water heater DIMPLEX - Free user manual and instructions

USER MANUAL ECSi210ST-580 DIMPLEX

Solar Direct, Solar Indirect and Solar Heat Pump Cylinders

Up to 300L

Six black cylindrical industrial heat exchangers with coiled and insulated internal structures, shown from different angles (no text or symbols visible)

EC-Eau Cylinder Range

Installation and User Instructions

Important - This manual must be left with the user after Installation!

benchmark COLLECTIVE MARK THE MARK OF QUALITY FOR THE INSTALLATION, COMMISSIONING AND SERVICING OF DOMESTIC HEATING AND HOT WATER SYSTEMS

hot water association CHARTER MEMBER

Dimplex is a licensed member of the Benchmark Scheme which aims to improve the standards of installation and commissioning of domestic heating and h water systems in the UK and to encourage regular servicing to optimise safety, efficiency and performance.

Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that customers are provided with the correct equipment for their needs, that it is installed, commissioned and serviced in accordance with the manufacturer's instructions by competent persons and that it meets the requirements of the appropriate Building Regulations. The Benchmark Checklist can be used to demonstrate compliance with Building Regulations and should be provided to the customer for future reference.

Installers are required to carry out installation, commissioning and servicing work in accordance with the Benchmark Code of Practice which is available from the Heating and Hot Water Industry Council who manage and promote the Scheme. Visit www.centralheating.co.uk for more information.

The HWA Charter requires that all members adhere to the following:

• supply fit for purpose products clearly and honestly described
- supply products that meet, or exceed appropriate standards and building and water regulations
• provide pre and post sales technical support
• provide clear and concise warranty details to customers

For further information on the HWA Charter Membership, please refer to tl HWA website www.hotwater.org.uk'

0 Overall View

Reference	Description
01	Cold Water Inlet
02	Hot Water Outlet
03	T & P Valve
04	Bottom Immersion
05	Top Immersion
06	Solar Flow
07	Solar Return
08	Bottom Thermostat
09	Technical Data Label

Flow Return m Thermostat tical Data Label 02 03 05 09 06 04 07 01 08

Figure 1: Overall view of Solar Direct Cylinder Installation process

Reference	Description
01	Cold Water Inlet
02	Hot Water Outlet
03	T & P Valve
04	Bottom Immersion
05	Solar Flow
06	Solar Return
07	Indirect Flow
08	Indirect Return
09	Bottom Thermostat
10	Top Thermostat
11	Technical Data Label

Return Thermostat Thermostat Data Label 02 03 07 04 08 10 05 11 06 01 09

Figure 2: Overall view of Solar Indirect Cylinder Installation process

Reference	Description
01	Cold Water Inlet
02	Hot Water Outlet
03	T & P Valve
04	Bottom Immersion
05	Solar Flow
06	Solar Return
07	Heat Pump Flow
08	Heat Pump Return
09	Bottom Thermostat
10	Top Thermostat
11	Secondary Return
12	Technical Data Label

Technical diagram of a vertical cylindrical tank with numbered components and piping connections, likely for industrial or hydraulic systems.

Figure 3: Overall view of Solar Heat Pump Cylinder Installation process

1 Contents

0 OVERALL VIEW 3
1 CONTENTS....6
2 INTRODUCTION....11
3 SCOPE OF DELIVERY 12
4 PRE-INSTALLATION ADVICE 15

4.1 RISK ASSESSMENT 15
4.2 SITING CONSIDERATIONS....15
4.3 COLD WATER SUPPLY 16
4.4 BUILDING REGULATION G3 DISCHARGE REQUIREMENTS....17

4.4.1 Discharge pipe D2 18
4.4.2 Worked example 19
4.4.3 Termination of discharge pipe 20

4.5 LIMITATIONS....21

5 INSTALLATION....21

5.1 COLD WATER INLET WITH INLET CONTROL GROUP 21

5.1.1 Correctly site the cylinder....21
5.1.2 Install the inlet group....21
5.1.3 Expansion vessel 21
5.1.4 Balanced cold water supply 22
5.1.5 Drain valve 22

5.2 HOT WATER OUTLET 22

5.2.1 Thermostatic mixing valve 22
5.2.2 Pipe insulation....22

5.3 DISCHARGE PIPES FROM SAFETY DEVICES 22

5.3.1 Discharge pipe D1 22
5.3.2 Discharge pipe D2 23
5.3.3 Tundish....23

5.4 IMMERSION HEATER....24
5.5 SOLAR COIL CONNECTIONS 25
5.6 AUXILIARY COIL CONNECTIONS 25
5.7 THERMOSTAT CONNECTION 26

5.7.1 Auxiliary loop wiring schematic (indirect cylinder only)....27
5.7.2 Solar loop wiring schematic (direct and indirect cylinders) .....28
5.7.3 Solar sensor connection....29

5.8 CONNECTION OF SECONDARY RETURN....34

6 COMMISSIONING....35
7 MAINTENANCE....36
8 SPARE PARTS 38
9 TECHNICAL DATA AND PRODUCT FICHE 39

9.1 CYLINDER HEAT EXCHANGER PRESSURE DROP 48

10 USER INSTRUCTIONS 50

10.1 GENERAL 50

10.2 OPERATION 51

10.2.1 Water temperature direct electric heating ....51

10.2.2 Water temperature auxiliary heating 52

10.3 MAINTENANCE....52

10.4 TROUBLESHOOTING....53

Precaution: "This appliance can be used by children aged from 8 years and above and persons with reduced physical sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understanding the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision."

Note: Between the inlet group and the cold water inlet on the cylinder NO isolating device may be fitted, as by doing so important safety devices could be isolated!

It is important to check the pre-charge pressure of the expansion vessel membrane before filling the cylinder. This has been factory set to 3 bar. The pre-charge should be greater than or equal to 3 bar.

It is important that the tundish is positioned away from any electrical components.

Note: Means for electrical disconnection must be incorporated in the fixed wiring in accordance with the wiring rules.

Before removing the cover from the immersion heater isolate appliance using isolating switch! Danger of electrical shock! Only use suitable electrically insulated equipment

when working inside immersion housing.

Note: The cylinder must be filled with water before switching on the immersion heater. Failure to do so will damage the element and void any guarantee on the product.

Full tank

No water X

Never operate cylinder without water or element can burn out

The maintenance of this appliance must be carried out by a suitably qualified person only. It is recommended to maintain the unit on an annual basis. Isolate all electrical supplies from the unit before commencing work. Danger of electrical shock!

CLEANING INSTRUCTIONS:

Clean outer cladding of cylinder with a soft cloth dampened with warm water only. Do not use abrasive or aggressive cleaning materials, such as alcohol or petroleum based solvents, as this may damage the surface of the product.

Temperature setting: A high level cutout is fitted to the product for each heat source. This should never activate under normal operation. The maximum possible cylinder temperature attainable by the heat pump is 65°C as set on the User Interface. The back-up immersion heater can produce up to 72°C at its maximum setting, i.e. 5. For

convenience the immersion heater is preset to produce 60°C.

If an electronic copy of this manual should be required, please contact the manufacturer at the address at the back of this manual.

Note: This appliance is intended to be permanently connected to the water mains and not connected by a hose-set.

Dimplex cannot take responsibility for ensuring safe operation of the appliance outside of the scope of intended use.

2 Introduction

Thank you for choosing a Dimplex product. The EC-Eau solar cylinders are specified with large, high surface area heat exchangers, specifically sized to match the requirements of Dimplex solar systems. They boast 60mm of low GWP insulation foam, together with 100% recyclable stainless steel inner components and a sleek black, hard wearing outer shell manufactured from completely recycled materials. For more detailed information on product features, please see the Technical Data section in this manual.

NOTE: This product has been designed specifically for the purpose of delivering heated, domestic and sanitary hot water as part of a pressurised water heating system. The package is provided with fittings that comply with Section G3 of Building Regulations.

WARNING: Dimplex cannot take responsibility for ensuring safe operation of the appliance outside of the scope of intended use.

3 Scope of delivery

Please ensure you check the scope of delivery below before signing any delivery documentation. Claims for missing or damaged parts after signing for the delivery will not be accepted

Scope of delivery
Cylinder volume		175l	210l	250l	300l
Cylinder with 3kW immersion *		2	2	2	2
T+P valve *		1/2", 7bar/90°C		1/2", 7bar/90°C
Inlet control group consisting of:-		√		√
- in line strainer
- 3 bar PRV
- 6 bar ERV
- non-return valve
- balanced cold water supply port
- 22mm connection for expansion vessel
Expansion vessel with fixing kit and connection hose		18 l		24 l
Tundish		15mm/22mm		15mm/22mm
Installation & User Instructions x 1		√		√
Terms and conditions x 1		√		√

Table 1: Scope of Delivery for Solar Direct Cylinders
* These items are supplied factory fitted

Scope of delivery
Cylinder volume		175l	210l	250l	300l
Cylinder with 3kW immersion *		1	1	1	1
T+P valve *		1/2", 7bar/90°C		1/2", 7bar/90°C
Inlet control group consisting of:-		√		√
- in line strainer
- 3 bar PRV
- 6 bar ERV
- non-return valve
- balanced cold water supply port
- connection for expansion vessel
22mm motorised two port valve		√		√
Expansion vessel with fixing kit and connection hose		18 l		24 l
Tundish		15mm/22mm		15mm/22mm
Installation & User Instructions x 1	[SDZK]	√		√
Terms and conditions x 1		√		√

Table 2: Scope of Delivery for Solar Indirect Cylinders
* These items are supplied factory fitted

Scope of delivery
Cylinder volume		300l
Cylinder with 3kW immersion *		1
T+P valve *		1/2", 7bar/90°C
Inlet control group consisting of:-		√
- in line strainer
- 3 bar PRV
- 6 bar ERV
- non-return valve
- balanced cold water supply port
- connection for expansion vessel
28mm motorised two port valve **		√
Expansion vessel with fixing kit and connection hose		24 l
Tundish		15mm/22mm
Installation & User Instructions x 1		√
Terms and conditions x 1		√

Table 3: Scope of Delivery for Solar Heat Pump Cylinder

* These items are supplied factory fitted

** Only part of the scope of delivery when not supplied as a Dimplex Heat Pump package

4 Pre-Installation Advice

Please read the following section carefully before commencing installation. If in any doubt, please call the appropriate help desk.

Disregarding the instructions given in this manual in its entirety and any relevant regulations, standards and codes of practice will void the guarantee of this product.

Handling – depending on the size of the unit and access to its installation location, consideration must be given to the handling of the unit. Please note that handling, installation and use of this product is subject to the Health and Safety at Work Act.

If the unit is not installed immediately, it should remain in its protective packaging with all pipe protectors/end caps applied to prevent damage and dirt deposit inside the cylinder and the coils.

Pipe work – the pipe runs should be executed as short as possible, unused pipe work should be removed and all remaining pipe work should be lagged in accordance with regulatory requirements to prevent heat loss and the formation of condensation.

Taps and fittings – all taps and fittings incorporated in the unvented system should have a rated operating pressure of 0.6 MPa (6 bar) or above.

4.1 Risk assessment

The compilation of a risk assessment is strongly recommended before installing the product. The following areas require particular consideration in addition to the information required by the Health and Safety at Work Act. - scalding: where appropriate or required by law a thermostatic mixing valve is to be fitted to the hot water outlet of the cylinder (see also water borne organisms).

- explosion: the unit is fully equipped with all relevant safety equipment to comply with current regulations. The correct design and function has been verified by independent third party testing. The correct application thereof is the responsibility of the competent installer.

- water borne organisms (i.e. Legionella): if applicable a risk assessment should be carried out following the recommendations outlined in the Approved Code of Practice L8.

- the user preference must be considered when commissioning the system, in particular when adjusting the solar and auxiliary system temperature and timer settings.

4.2 Siting considerations

When choosing a suitable location for the cylinder the following aspects should be considered:

• structural integrity
• access for installation, operation, maintenance and replacement
• routing of discharge pipe work
• access to water mains supply, hot and cold water distribution pipe work
• access to suitable electricity supply
• location in relation to remaining system components such as auxiliary and solar heating system

- frost protection

The solar cylinder range is designed to be floor standing, vertically mounted, indoors and in a frost free environment. The cylinder may be located on any flat and level surface, provided it is sufficiently robust to support the weight of the cylinder when full of water (please see technical data) and suitably accessible for replacement/maintenance without specialist tools or lifting equipment as this will void the warranty conditions.

The position and orientation of the cylinder should be such that easy access is provided for servicing the controls. A minimum distance of 400mm in front of the immersion is recommended, to allow the replacement of the immersion heater should the need arise. When installing the cylinder all labels should be clearly visible and ensure that no pipework hinders any work to be carried out on the various cylinder components.

Particular care must be taken when placing the cylinder in a garage or outbuilding. All exposed pipe work must be correctly insulated to avoid frost damage.

CLEANING INSTRUCTIONS: Clean outer cladding of cylinder with a soft cloth dampened with warm water only. Do not use abrasive or aggressive cleaning materials, such as alcohol or petroleum based solvents, as this may damage the surface of the product.

4.3 Cold water supply

For satisfactory and safe performance of the unvented cylinder the water supply must meet the following criteria:

Minimum dynamic pressure	150 kPa(1.5 bar)
Maximum inlet supply pressure	1200 kPa(12 bar)
Minimum flow rate	15 l/min
Max. chlorine content	250mg/L
Max. water hardness	200mg/L

The following instructions have to be followed when installing the cold water mains supply to the cylinder:

• The cold water supply to the cylinder must come directly from the cold water mains after the mains stop valve to the property.
• The cold water inlet pipe work should have at least an inside diameter of 19mm and should meet the requirements of the water regulations for the supply of wholesome water.

Dimplex recommend an annual maintenance inspection is carried out on the domestic hot water cylinder. In hard water areas this should include inspection of the heat exchanger and immersion heater, [above 120ppm or 120mg/l]. A local water treatment company should be able to offer free water quality testing. The heating elements may require periodic de-scaling. The installer should do this as part of a maintenance agreement.

If required, precautions can be taken to minimise effects of water hardness, i.e. installation of water conditioner or water softener. These devices should be installed in hard water areas where high water storage temperatures are required, i.e. greater than 60°C storage temperatures, particularly when water hardness exceeds 200ppm. Should the water cylinder require de-scaling, this must be performed by a qualified technician.

4.4 Building regulation G3 Discharge requirements

As part of the requirements of Building Regulation G3 any discharge from an unvented system should be conveyed to where it is visible, but will not cause danger to persons in or about the building. The tundish and the discharge pipes should be fitted in accordance with the requirements of Building Regulation approved document G3, (England and Wales), Part P of Northern Ireland and Standard 4.9 of Scotland.

4.4.1 Discharge pipe D2

The discharge pipe (D2) from the Tundish should:

- "have a vertical section of pipe at least 300mm long below the tundish before any elbows or bends in the pipework and be installed with a continuous fall of at least 1 in 200 thereafter."

The discharge pipe (D2) should be made of:

- "metal; or other material that has been demonstrated to be capable of safely withstanding temperatures of the water discharged and is clearly and permanently marked to identify the product and performance standard"

Dimplex strongly recommends the use of metal pipework only and Dimplex does not take responsibility for any damage caused from discharges.

The discharge pipe D2 should be at least one pipe size larger than the nominal outlet size of the safety device unless its total equivalent hydraulic resistance exceeds that of a straight pipe 9m long, i.e. for discharge pipes between 9m and 18m the equivalent resistance length should be at least two sizes larger than the nominal outlet size of the safety device; between 18 and 27m at least 3 sizes larger, and so on; bends must be taken into account in calculating the flow resistance. See Figure 4, Table 4 and the worked example.

Note: An alternative approach for sizing discharge pipes would be to follow Annex D, section D.2 of BS 6700:2006 + A1:2009).

Safety device (e.g. temperature relief valve) Metal discharge pipe (D1) from temperature relief valve to tundish 600mm maximum Tundish 300mm minimum Discharge pipe (D2) from tundish, with continuous fail. See Table and worked example Discharge below fixed grating Fixed grating Trapped guiley

Figure 4: Typical discharge pipe arrangement

Valve outlet size[-]	Minimum size of discharge pipe before tundish[mm]	Minimum size of discharge pipe after tundish[mm]	Maximum allowed length of pipe after tundish[m]	Length to be subtracted for each elbow or bend[m]
G1/2	15	22	9	0.8
		28	18	1.0
		35	27	1.4
G3/4	22	28	9	1.0
		35	18	1.4
		42	27	1.7
G1	28	35	9	1.4
		42	18	1.7
		54	27	2.3

Table 4: Sizing of copper discharge pipe "D2" for common temperature relief valve outlet sizes

4.4.2 Worked example

This example is for a G½ temperature relief valve with a discharge pipe (D2) (as fitted on 125 to 300L cylinders) having 4 No. 22mm elbows and length of 7m from the tundish to the point of discharge.

From Table 4, the maximum resistance allowed for a straight length of 22mm copper discharge pipe

(D2) from a G½ temperature relief valve is 9.0m. Subtract the resistance for 4 No. 22mm elbows at 0.8m each = 3.2m.

Therefore the maximum permitted length

equates to 5.8m, which is less than the actual length of 7m, therefore calculate the next largest size.

Maximum resistance allowed for a straight length of 28mm copper discharge pipe (D2) from a G½ temperature relief valve is: 18m

Subtract the resistance for 4 No. 28mm elbows at 1.0m each = 4m

Therefore the maximum permitted length equates to 14m.

As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.

- Where a single common discharge pipe serves more than one system, it should be at least one pipe size larger than the largest individual discharge pipe (D2) to be connected.

- The discharge pipe should not be connected to a soil discharge stack unless the soil discharge stack is capable of safely withstanding temperatures of the water discharged, in which case, it should:

- contain a mechanical seal, which allows water into the branch pipe without allowing foul air from the drain to be ventilated through the tundish.

- there should be a separate branch pipe with no sanitary appliances connected to it.

- if plastic pipes are used as branch pipes carrying discharge from a safety device, they should be either polybutalene (PB) or cross-linked polyethylene (PE-X) complying with national standards.

- be continuously marked with a warning that no sanitary appliances should be connected to the pipe.

4.4.3 Termination of discharge pipe

- "The discharge pipe (D2) from the tundish should terminate in a safe place where there is no risk to persons in the vicinity of the discharge."

- Examples of acceptable discharge arrangements are:

- "to a trapped gully with the end of the pipe below a fixed grating and above the water seal;

- downward discharges at low level; i.e. up to 100mm above external surfaces such as car parks, hard standings, grassed areas etc. are acceptable providing that a wire cage or similar guard is positioned to prevent contact, whilst maintaining visibility; and,

- discharges at high level: e.g. into a metal hopper and metal downpipe with the end of the discharge pipe clearly visible or onto a roof capable of withstanding high temperature discharges of water and 3m from any plastic guttering system that would collect such discharges."

Note: As the discharge would consist of high temperature water and steam, asphalt, roofing felt and non-metallic rainwater goods may be damaged by such discharges.

4.5 Limitations

- The solar collector array must be specified correctly, to ensure it is compatible with the model of cylinder installed. This is to prevent the cylinder overheating or the solar array to be exposed to prolonged stagnation periods.

- The heat exchangers in this range of cylinders have been specifically designed for solar applications. Great care must be taken if using these cylinders with other heat sources, due to the heat exchange capacity of the product.

- Solar cylinders must be installed with a solar hydraulic pump station, which incorporates non-return valves.

- When the cylinder is installed with a low cost pump station which incorporates only one non-return valve, then an additional non-return valve is to be installed within the closed loop to prevent gravity circulation.

5 Installation

5.1 Cold Water Inlet with Inlet Control Group

5.1.1 Correctly cylinder site the

Install the cylinder in an appropriate location, ensuring all of the recommendations have been considered (see chapter 4.2).

5.1.2 Install the inlet group

The inlet group regulates the pressure of the incoming mains water supply to the cylinder and removes any debris that might be water borne.

Note: Between the inlet group and the cold water inlet on the cylinder NO isolating device may be fitted, as by doing so important safety devices could be isolated!

5.1.3 Expansion vessel

The expansion vessel is mandatory on all EC-Eau cylinders and can be connected directly to the cold water inlet group, utilising the flexible hose supplied with the vessel. The expansion vessel should always be fitted in accordance with the manufacturer's instructions. No isolating device should be fitted between the water cylinder and the cold water inlet group.

Furthermore, it is recommended to mount the vessel higher than the cylinder to avoid having to drain the cylinder when maintaining and replacing the expansion vessel.

3D rendering of a weather control device with a cylindrical top and vertical pipe (no text or symbols visible)

Figure 5: Connection of the expansion vessel to the inlet group

It is important to check the pre-charge pressure of the expansion vessel membrane before filling the cylinder. The pre-charge should be greater than or equal to 3bar.

Note: The expansion vessel must be installed to the side of the expansion relief valve on the inlet group. To do this the blanking plug must be removed and the expansion vessel connected, as shown in Figure 6.

Cold Water from Mains Balanced Cold Water Supply 3 bar Expansion Vessel Connection Expansion Relief Valve Cold Water to Cylinder

Figure 6: Detail showing the connection of the expansion vessel to the inlet group

5.1.4 Balanced cold water supply

If balanced cold water supply is required a connection can be taken from the bottom of the inlet group.

5.1.5 Drain valve

It is also recommended to install a drain valve (not supplied) in the lowest point of the cold water feed to the cylinder. This allows the cylinder to be drained in a controlled manner should this become necessary.

5.2 Hot Water Outlet

The hot water pipe work is to be directly connected to the hot water outlet connection on the cylinder, see Figure 1.

5.2.1 Thermostatic mixing valve

A thermostatic mixing valve may be required to limit the outlet temperature. In this case, the valve should be installed following the manufacturer's instructions, ensuring none of the safety equipment has been isolated, (i.e. make sure the connection to the thermostatic mixing valve is taken after the safety equipment of the inlet group).

5.2.2 Pipe insulation

It is recommended to insulate the hot water pipe work from the cylinder to the outlets, to reduce the energy requirements for providing hot water. It is also recommended to insulate all other exposed pipework, such as the T&P to the tundish, the coil flow and return and the cold water inlet pipes.

5.3 Discharge pipes from safety devices

5.3.1 Discharge pipe D1

- The temperature and pressure relief valve must be discharged directly or by way of a manifold via a short length of metal pipe (D1) into a tundish; and the discharge pipe must be installed in a continuously downward direction and in a frost free environment. Water may drip

from the discharge pipe of the pressure relief device and this pipe must be left open to the atmosphere.

• The diameter of discharge pipe (D1) should not be less than the nominal outlet size of the safety device, e.g. temperature relief valve.
• Where a manifold is used it should be sized to accept and discharge the total discharge from all the D1 discharge pipes connected to it.
• The discharge pipe work from the expansion relief valve must be installed constantly falling to an open point of discharge. It is recommended to combine it with the discharge of the temperature and pressure relief valve.

Note: The T&P valve is pre-sealed and if moved the seal will be broken, should this occur, it will need to be resealed with an appropriate sealant (Dimplex part number R00836-1).

5.3.2 Discharge pipe D2

For a detailed description of the discharge pipework D2 see chapter 4.4.1.

5.3.3 Tundish

• The tundish should be vertical, located in the same space as the unvented hot water storage system and be fitted as close as possible to, and lower than, the safety device, with no more than 600mm of pipe between the valve outlet and the tundish (see Figure 4).
• Discharge should be visible at the tundish, where discharges may not be apparent, e.g. in dwellings occupied by people with impaired vision or mobility, consideration should be given to the installation of a suitable safety device to warn when discharge takes place, e.g. electronically operated.

Note: To comply with the Water Supply (Water Fittings) Regulations, the tundish should incorporate a suitable air gap.

It is important that the tundish is positioned away from any electrical components.

E 3 2 Safety 4 1 5 N L Earth (green/yellow) Neutral (blue) Live (brown) Immersion Heater

Figure 7: Wiring diagram for Immersion Heater

5.4 Immersion heater

The immersion heater has to be connected in accordance with IEE Wiring Regulations and the installer carrying out the work has to be suitably qualified. It must be connected through a double pole isolating switch or suitable controller which must have a contact separation of at least 3mm in all poles. The wiring diagram can be seen in Figure 7. For further details please see instructions provided with the immersion heater.

The immersion heater incorporates an independent non-self resetting over temperature cut-out. Should the over temperature cut-out operate, the reset pin will be pushed upwards, and become level or slightly proud of the cover at the position marked "Safety". Use a suitable sized implement to reset the pin by pushing it hard into its original position.

Note: Should it be necessary to remove the thermostat from the immersion element, ensure that the contacts are re-fitted correctly into the positions on the element. Failure to do so carries the risk of overheating the contacts and thus damaging the appliance.

A torque of 40 Nm is recommended when tightening up the immersion after it has been removed and refitted. The immersion heater thermostat must not be opened under any circumstances.

Note: The cylinder must be filled with water before switching on the immersion heater. Failure to do so will damage the element and void any guarantee on the product.

5.5 Solar coil connections

If the flow connection is the highest point in the solar loop and if the system was not commissioned using a flush and fill pump, an adequate device for de-aeration must be installed.

For ease of maintenance it is recommended to install a drain valve at the return connection of the solar coil. Compression fittings should be used to complete this part of the installation.

Note: If the cylinder is located higher than the solar collector array, a two port valve has to be installed and wired accordingly.

5.6 Auxiliary coil connections

If the flow connection is the highest point in the auxiliary heating loop an adequate device for de-aeration must be installed.

For ease of maintenance it is recommended to install a drain valve at the return connection of the auxiliary heating coil, if this is the lowest point in the auxiliary heating loop.

It is recommended that the fittings used to connect to the cylinder are suitable for stainless steel, the flow and return should use 28mm compression fittings. Not all push fit fittings can be used – please check with your supplier. When using compression fittings, ensure that the connection is not over-tightened.

5.7 Thermostat connection

The solar circulation pump and the auxiliary heating system can be wired to the cylinder in various ways as described by the chosen supplier.

To conform to building regulations, it is imperative that any heat generator connected to the cylinder is installed through the correct twin thermostat, which is factory fitted to the cylinder.

The two port valve supplied with the solar indirect cylinder is to be installed by default into the auxiliary heating loop. If the cylinder is located higher than the solar collector array, a two port valve has to be installed in the solar loop and wired accordingly.

graph TD
    A["From control unit"] --> B["T"]
    C["To solar pump/ two port valve"] --> D["T"]
    E["Earth"] --> F["T"]
    G["1"] --> H["High temp cut out stat"]
    I["2"] --> J["Temp control stat"]
    K["1"] --> J
    L["2"] --> J
    M["3"] --> N["T4"]
    O["Ground"] --> P["Ground"]

NOTE: T1 and T2 must be connected. T3 can replace T2 only when a normally open configuration is required.

Figure 8: Thermostat Wiring Schematic

5.7.1 Auxiliary loop wiring schematic (indirect cylinder only)

graph TD
    A["Main supply 236V/5Hz"] --> B["Main supply"]
    B --> C["Main supply"]
    C --> D["Main supply"]
    D --> E["Main supply"]
    E --> F["Main supply"]
    F --> G["Main supply"]
    G --> H["Main supply"]
    H --> I["Main supply"]
    I --> J["Main supply"]
    J --> K["Main supply"]
    K --> L["Main supply"]
    L --> M["Main supply"]
    M --> N["Main supply"]
    N --> O["Main supply"]
    O --> P["Main supply"]
    P --> Q["Main supply"]
    Q --> R["Main supply"]
    R --> S["Main supply"]
    S --> T["Main supply"]
    T --> U["Main supply"]
    U --> V["Main supply"]
    V --> W["Main supply"]
    W --> X["Main supply"]
    X --> Y["Main supply"]
    Y --> Z["Main supply"]
    Z --> AA["Main supply"]
    AA --> AB["Main supply"]
    AB --> AC["Main supply"]
    AC --> AD["Main supply"]
    AD --> AE["Main supply"]
    AE --> AF["Main supply"]
    AF --> AG["Main supply"]
    AG --> AH["Main supply"]
    AH --> AI["Main supply"]
    AI --> AJ["Main supply"]
    AJ --> AK["Main supply"]
    AK --> AL["Main supply"]
    AL --> AM["Main supply"]
    AM --> AN["Main supply"]
    AN --> AO["Main supply"]
    AO --> AP["Main supply"]
    AP --> AQ["Main supply"]
    AQ --> AR["Main supply"]
    AR --> AS["Main supply"]
    AS --> AT["Main supply"]
    AT --> AU["Main supply"]
    AU --> AV["Main supply"]
    AV --> AW["Main supply"]
    AW --> AX["Main supply"]
    AX --> AY["Main supply"]
    AY --> AZ["Main supply"]
    AZ --> BA["Main supply"]
    BA --> BB["Main supply"]
    BB --> BC["Main supply"]
    BC --> BD["Main supply"]
    BD --> BE["Main supply"]
    BE --> BF["Main supply"]
    BF --> BG["Main supply"]
    BG --> BH["Main supply"]
    BH --> BI["Main supply"]
    BI --> BJ["Main supply"]
    BJ --> BK["Main supply"]
    BK --> BL["Main supply"]
    BL --> BM["Main supply"]
    BM --> BN["Main supply"]
    BN --> BO["Main supply"]
    BO --> BP["Main supply"]
    BP --> BQ["Main supply"]
    BQ --> BR["Main supply"]
    BR --> BS["Main supply"]
    BS --> BT["Main supply"]
    BT --> BU["Main supply"]
    BU --> BV["Main supply"]
    BV --> BW["Main supply"]
    BW --> BX["Main supply"]
    BX --> BY["Main supply"]
    BY --> BZ["Main supply"]
    BZ --> CA["Main supply"]
    CA --> CB["Main supply"]
    CB --> CC["Main supply"]
    CC --> CD["Main supply"]
    CD --> CE["Main supply"]
    CE --> CF["Main supply"]
    CF --> CG["Main supply"]
    CG --> CH["Main supply"]
    CH --> CI["Main supply"]
    CI --> CJ["Main supply"]
    CJ --> CK["Main supply"]
    CK --> CL["Main supply"]
    CL --> CM["Main supply"]
    CM --> CN["Main supply"]
    CN --> CO["Main supply"]
    CO --> CP["Main supply"]
    CP --> CQ["Main supply"]
    CQ --> CR["Main supply"]
    CR --> CS["Main supply"]
    CS --> CT["Main supply"]
    CT --> CU["Main supply"]
    CU --> CV["Main supply"]

Figure 9: Wiring schematic auxiliary loop

5.7.2 Solar loop wiring schematic (direct and indirect cylinders)

graph TD
    A["Valve 1"] --> B["Pump"]
    B --> C{Control Unit}
    C --> D["Valve 2"]
    D --> E["Control Unit"]
    E --> F["Valve 3"]
    F --> G["Control Unit"]
    G --> H["Valve 4"]
    H --> I["Control Unit"]
    I --> J["Valve 5"]
    J --> K["Control Unit"]
    K --> L["Valve 6"]
    L --> M["Control Unit"]
    M --> N["Valve 7"]
    N --> O["Control Unit"]
    O --> P["Valve 8"]
    P --> Q["Control Unit"]
    Q --> R["Valve 9"]
    R --> S["Control Unit"]
    S --> T["Valve 10"]
    T --> U["Control Unit"]
    U --> V["Valve 11"]
    V --> W["Control Unit"]
    W --> X["Valve 12"]
    X --> Y["Control Unit"]
    Y --> Z["Valve 13"]
    Z --> AA["Control Unit"]
    AA --> AB["Valve 14"]
    AB --> AC["Control Unit"]
    AC --> AD["Valve 15"]
    AD --> AE["Control Unit"]
    AE --> AF["Valve 16"]
    AF --> AG["Control Unit"]
    AG --> AH["Valve 17"]
    AH --> AI["Control Unit"]
    AI --> AJ["Valve 18"]
    AJ --> AK["Control Unit"]
    AK --> AL["Valve 19"]
    AL --> AM["Control Unit"]
    AM --> AN["Valve 20"]

Solar controller loop wiring details Mains supply 230V/50Hz Solar controller + - G - 02 L - 01 H - 02 E - 01 H - 02 3-wen 01 linear/female 02 2-wa 03 02 06 08 09 011 11 033 12 0 13 02 2 Solar Twin Thermostat Solar pump Control Unit 4 way junction box Solar pump Twin cylinder thermostat L N

Figure 10: Wiring schematic solar loop

5.7.3 Solar sensor connection

5.7.3.1 Solar Sensor Connection Thermostat Housing (direct x 1, indirect x 2)

C B A

Step 1: Access the sensor mounting plate. To do this remove the Dual Cut Out cover plate (A) by removing the fixing screw and insulation foam (B) to access the sensor mounting plate (C). Remove the M5 fixing screws in the four corners of the plate.

Interior view of a mechanical or electronic device with labeled component D, showing internal components and mounting holes (no readable text or symbols)

Interior view of a device showing internal components including a labeled component 'E' (no text or symbols beyond the label)

Step 2: Orientate the sensor mounting plate to allow access to the phials (four clips in the centre of the sensor mounting plate). Be careful not to kink the capillaries that connect the thermostat bulbs. The sensor mounting plate will have two vacant slots for additional sensors (D). Slide the solar sensor into place as shown (E).

Interior view of an electronic device showing internal components and a labeled component 'F' (no text or symbols beyond label)

Step 3: Move the sensor mounting plate back into its fixing position. Be careful not to kink the capillaries that connect the thermostat bulbs. Fit the four M5 fixing screws into the cylinder bracket (F). Tighten the screws until the thermostat bulbs and heat pump sensor are held firmly against the wall of the inner cylinder.

Note: there should be no movement in the phials that are used to hold the bulbs and sensor. Care should be taken not to overtighten the screws.

Interior view of a device casing with internal components and a dial indicator (no text or symbols visible)

Step 4: Replace the insulating foam over the sensor mounting plate.

Simple grayscale icon of a refrigerator with a handle and circular button (no text or symbols)

Step 5: Refit the Dual Cut Out cover plate. Enter the fixing tab into the slot provided at the base of the enclosure and fit the fixing screw.

5.7.3.2 Solar Sensor Connection Boost Immersion (direct x 1, indirect N/A)

C B A

Step 1: Access the sensor mounting plate. To do this remove the immersion cover plate (A) by removing the fixing screw and insulation foam (B) to access the sensor mounting plate (C). Remove the M5 fixing screws.

Mechanical assembly diagram showing a bracket and internal components (no text or symbols)

Step 2: The sensor mounting plate will have a vacant slot for the solar probe. Slide the solar probe into place as shown (D).

Close-up of a mechanical component with a central circular housing and mounting holes (no visible text or symbols)

Top-down view of a mechanical component with mounting holes and central hub (no visible text or symbols)

Top-down view of a mechanical component with mounting holes and central circular feature (no text or symbols)

Step 3: Return the sensor mounting plate to its fixture position.

Technical diagram of a mechanical component with labeled part 'F' and mounting holes (no readable text or symbols)

Top-down view of a mechanical component with a central circular feature and labeled point G (no text or symbols beyond the label)

H

Step 4: Fit the M5 fixing screws into the cylinder bracket (F).

Note: Care must be taken to place the probe on the stainless steel of the inner vessel. There should be no movement in the phial (clip in the centre of the sensor mounting plate) that is used to hold the probe.

Replace the insulation foam over the sensor mounting plate (G) and refit the immersion cover plate (H).

5.8 Connection of Secondary Return

For cylinders that do not have a dedicated secondary return connection, it is possible to install a secondary return by connecting a swept - T to the cold water inlet of the cylinder (see Figure 11).

The secondary return pipe should incorporate a check valve and a WRAS approved circulation pump; timer and thermostat to be provided separately. Where secondary return circuits are used, then an additional expansion vessel may be required.

The secondary return loop must avoid:

• stagnant water in long pipe runs
• long waiting times at draw off point for hot water
• undue water wastage

To minimise the energy consumption of the secondary return circuit and to ensure reliable operation it is important to consider:

• the control of the circulation pump to be time and temperature controlled
• the secondary return circuit pipe work to be insulated
• the secondary return pump to be of suitable material and specification

HW Outlet To Taps From Taps Swept-T

Figure 11: Secondary return loop

6 Commissioning

At the time of commissioning, complete all relevant sections of the Benchmark Checklist located on the inside back pages of this document.

The following commissioning procedures only detail the required steps to be taken for the potable water loop:

1) Before making any mains connections to the inlet control group, flush the mains pipework out to ensure all debris has been removed so as not to damage the strainer within the combination valve.
2) Make final mains connection on combination valve and check all connections and joints to ensure they have been tightened and secured correctly.
3) Before turning on the mains supply to the cylinder a hot water tap should be opened, preferably on the same floor or the floor below where the cylinder is located.
4) Check the pre-charge in the expansion vessel and ensure it is at least 3 bar. Note actual pressure on label on expansion vessel.
5) Turn on the supply to the cylinder and fill until water runs from the open hot water tap. Continue to flush the system until all debris has been removed.

6) Close the hot water tap.
7) Check all joints for leaks, even those not having been altered especially when replacing a vented cylinder.
8) Open temperature and pressure relief valve to ensure proper discharge and check after closing that valve is not dripping.
9) Open pressure relief valve to ensure proper discharge and check after closing that valve is not dripping.
10) Check all shower outlets, toilet cisterns and other draw off points for leaks or dripping (especially when replacing a vented unit). Open all water outlets to purge air from pipe work and ensure proper operation.
11) Adjust timer programmer and cylinder thermostat settings in accordance with client requirements.
12) Instruct user in the operation of the unit and hand over this manual advising the owner of annual service requirements.
13) Complete the technical data label on the cylinder with legible and permanent writing.

7 Maintenance

After servicing, complete the relevant Service Record section of the Benchmark Checklist located on the inside back pages of this document. To meet with warranty requirements the cylinder must be serviced annually.

The maintenance of this appliance must be carried out by a suitably qualified person only. It is recommended to maintain the unit on an annual basis. Isolate all electrical supplies from the unit before commencing work. Danger of electrical shock!

1) Draw some water from cold water tap and retain in container.

2) Isolate cold water mains supply from cylinder.

3) Briefly open temperature and pressure relief valve, assure safe discharge and check that valve is not dripping when closed.

4) Briefly open expansion relief valve, assure safe discharge and check that valve is not dripping when closed. The expansion relief valve should be operated regularly to remove lime deposits and to verify that it is not blocked.

5) Open hot water tap and release remaining pressure from unit.

6) If the system is drained completely for an internal inspection, ensure the hot water tap remains open, connect a hose to the drain valve and ensure a safe discharge.

7) Note the set pressure of the pressure reducing valve. Remove cartridge and clean strainer in water provided in container. Re-assemble pressure reducing valve ensuring the correct pressure is set.

8) Periodically the immersion heaters should be removed cleaned and the unit flushed out. Check the O-ring seal for damage and replace if necessary. A torque of 40 Nm is recommended when tightening up the immersion after it has been removed and refitted.

9) Check electrical wiring connections and the condition of the cable of the immersion heater and the thermostat.

10) The immersion heater boss can also be used for access to view the internal components of the cylinder.

11) Re-commission unit (see chapter 6).

If the cylinder is not in use for excess of 1 month, it must be drained down by a competent person and recommissioned before use. Note: The immersion must be switched off at the mains before draining the cylinder.

If replacement parts are required, please see Figure 12 for part descriptions and part numbers.

CLEANING INSTRUCTIONS:

Clean outer cladding of cylinder with a soft cloth dampened with warm water only. Do not use abrasive or aggressive cleaning materials, such as alcohol or petroleum based solvents, as this may damage the surface of the product.

8 Spare Parts

Description		Part No	Solar Direct	Solar Indirect	Solar Heat Pump
22mm x 3bar Inlet control group		R00041-1	√	√	√
Inlet control group PRV cartridge		R00009-1	√	√	√
Inlet control group CRV		R01447-1	√	√	√
18 litre expansion vessel		R00045-2	√	√	x
24 litre expansion vessel		R00046-2	√	√	√
Expansion vessel fixing kit		R00094-1	√	√	√
DN16 3/4" BSP x 1000 flex pipe		R00095-1	√	√	√
1/2" BSP T&P valve		R00020-1	√	√	√
15 x 22 straight PE tundish		R00047-1	√	√	√
1 3/4" M BSP 3kW 1mm CW Stat		R03232-1	√	√	√
3/4" BSP 3kW x 14" Incoloy Immersion Heater		R01958-1	√	√	√
Snql Pole Rodstat CW Manual Reset		R01959-1	√	√	√
3kW Titanium Imm htr CW rodstat		R01204-2	√	√	√
22mm/18l d/dST/HP CYL Safety Kit*		R00832-1	√	x	x
22mm/24l d/dST/HP CYL Safety Kit**		R00829-1	√	x	√
22mm/19l vIST CYL Safety Kit***		R01178-1	x	√	x
22mm/24l vIST CYL Safety Kit****		R01179-1	x	√	x
Renewable Integrated Dual Cut Out Enclosure		R01941-1	√	√	√
Renewable Dual Cut Out Cover Plate Complete with Label		R01944-1	√	√	√
Renewable immersion enclosure		R01951-1	√	√	√
Renewable Immersion Cover Plate Complete with Label		R01948-1	√	√	√
22mm motorised two port valve		R00048-1	x	√	x
Solar Direct, Indirect and Heat Pump Cylinders Installation & User Instructions manual		R01128-8	√	√	√
Terms and conditions		R01020-3	√	√	√

Figure 12: Replacement part numbers for Solar range of cylinders

9 Technical data and Product Fiche

Ø580 598 80°

Figure 13: Solar Direct Cylinder and Cross-section (for reference only)

Solar Direct Cylinder Range- Product Dimensions
Reference	175	210	250	300
Weight [kg]	34	38	44	50
Reheat time# [mins]*	101	128	166	208
Average draw off temperature [°C]	61	60	61	61
Hot water draw off capacity# (I)* / Draw off flow rate (l/s)	100	115	151	195
	0.25	0.25	0.25	0.50
HX performance [kW]*	24	22	22	21
Heat Loss [kWh]*	1.12	1.41	1.51	1.96
Dedicated solar volume (I)*	75	95	100	105
Height [mm]	1265	1490	1765	2065
Outer Diameter [mm]	580	580	580	580
HW Outlet [mm]	1040	1265	1540	1840
T&P valve [mm]	1040	1265	1540	1840
CW Inlet [mm]	180	180	180	180
Bottom Immersion [mm]	620	715	780	870
Top Immersion [mm]	885	1110	1340	1610
Solar Return [mm]	180	180	180	180
Solar Flow [mm]	515	515	515	515
Bottom Thermostat [mm]	320	320	320	320

Table 5: Solar Direct Cylinder Dimensions

Note: All measurements are taken from the base of the cylinder to the mid-point on the item.

* Determined in accordance with EN12897.

# Auxiliary values

GDC Group Ltd	Heat Pump Cylinder Range – Product Fiche
Reference	Energy Rating	Standing Loss [W]	Storage Volume [L]
ECSd175ST-580	B	56	175
ECSd210ST-580	B	59	210
ECSd250ST-580	B	66	250
ECSd300ST-580	B	82	300

Table 6: Solar Direct Cylinder Product Fiche

Solar Direct Cylinder Range
Reference	175	210	250	300
Actual capacity [L]	175	210	250	300
Materials- inner cylinder- outer cylinder- inlet/outlet- coils- insulation	Duplex stainless steel LDX2101HIPSStainless steelStainless steel twin coil60mm PU foam (GWP=1, ODP=0)
Maximum operating conditions- potable water temperature- heating water temperature- operating pressure	70°C95°C3 bar
Cold water supply- minimum dynamic pressure- maximum pressure- minimum flow rate	1.5 bar12 bar15 l/min
Connections- cold water inlet- hot water outlet- coil flow and return	22mm stainless steel22mm stainless steel22mm stainless steel
Coil specification- surface area [m2]- rating [kW]*
	1.1
	24	22	22	21
Immersion heater	1 3/4 F BSP 3kW
Thermostatic control- direct input- indirect input	integral immersion heater thermostat and cut outintegral twin thermostat (10 to 70°C) and cut out (~85°C)
Safety components- pressure reducing valve and strainer- expansion relief valve- temperature and pressure relief valve- factory pressure test	3 bar6 bar7 bar/90°C12 bar
Other features	Over 60% in volume from recycled materials#Surface mounted sensor devices for compatibility and ease of maintenance
Approvals	KIWA approval number:- 1112702
Guarantee- inner cylinder- immersion heaters- other components	25 yrs2 yrs - excluding the effects of lime scale2 yrs - excluding expansion vessel membrane pressure

Table 7: Solar Direct Product features
* Determined in accordance with EN12897.

Not including insulation

Ø580 598 80°

Figure 14: Solar Indirect Cylinder and Cross-Section (for reference only)
Installation and User Instructions R01128-8 09/15 Page 42

Technical Data

Solar Indirect Cylinder Range
Reference	175	210	250	300
Weight [kg]	37	40	47	52
Reheat time# [mins]*	12	15	24	31
Average draw off temperature [°C]	62	60	60	61
Hot water draw off capacity# (I)* / Draw off flow rate (l/s)	800.25	1000.25	1400.25	1750.50
Heat Loss [kWh]*	1.12	1.41	1.51	1.96
Dedicated solar volume (l)*	95	110	110	125
Height [mm]	1265	1490	1765	2065
Outer Diameter [mm]	580	580	580	580
HW Outlet [mm]	1040	1265	1540	1840
T&P valve [mm]	1040	1265	1540	1840
CW Inlet [mm]	180	180	180	180
Bottom Immersion [mm]	570	1145	1345	1645
Solar Return [mm]	180	180	180	180
Solar Flow [mm]	515	515	515	515
Indirect Return [mm]	730	827	895	982
Indirect Flow [mm]	945	1042	1110	1197
Bottom Thermostat [mm]	320	320	320	320
Top Thermostat [mm]	840	930	1000	1085

Table 8: Solar Indirect Cylinder Dimensions

Note: All measurements are taken from the base of the cylinder to the mid-point on the item.

* Determined in accordance with EN12897.

# Auxiliary values

GDC Group Ltd	Heat Pump Cylinder Range – Product Fiche
Reference	Energy Rating	Standing Loss [W]	Storage Volume [L]
ECSi175ST-580	B	56	175
ECSi210ST-580	B	59	210
ECSi250ST-580	B	66	250
ECSi300ST-580	B	82	300

Table 9: Solar Indirect Cylinder Product Fiche

Solar Indirect Cylinder Range
Reference / Capacity	175	210	250	300
Materials
- inner cylinder	Duplex stainless steel LDX2101
- outer cylinder	HIPS
- inlet/outlet	Stainless steel
- coils	Stainless steel twin coil
- insulation	60mm PU foam (GWP=1, ODP=0)
Maximum operating conditions
- potable water temperature	70°C
- heating water temperature	95°C
- operating pressure	3 bar
Cold water supply
- minimum dynamic pressure	1.5 bar
- maximum pressure	12 bar
- minimum flow rate	15 l/min
Connections
- cold water inlet	22mm stainless steel
- hot water outlet	22mm stainless steel
- coil flow and return	22mm stainless steel
Coil specification
- indirect coil surface area [m2]	0.8
- solar coil surface area [m2]	1.1
- HX performance indirect coil [kW]*	20	20	17	18
- HX performance solar coil [kW]*	23	22	19	20
- max. working pres. (Solar / Aux.) [Bar]	6 / 3
Immersion heater	1 3/4 F BSP 3kW
Thermostatic control
- direct input	integral immersion heater thermostat and cut out
- indirect input	integral twin thermostat (10 to 70°C) and cut out (~85°C)
Safety components
- pressure reducing valve and strainer	3 bar
- expansion relief valve	6 bar
- temperature and pressure relief valve	7 bar/90°C
- factory pressure test	12 bar
Other features	Over 60% in volume from recycled materials#Surface mounted sensor devices for compatibility and ease of maintenance
Approvals	KIWA approval number:- 1112703
Guarantee
- inner cylinder	25 yrs
- immersion heaters	2 yrs - excluding the effects of lime scale
- other components	2 yrs - excluding expansion vessel membrane pressure

Table 10: Solar Indirect Product Features
* Determined in accordance with EN12897 at 80°C flow temperature and 0.25l/s flow rate.

Not including insulation

Ø580 598 80°

Figure 15: Solar Heat Pump Cylinder and Cross-Section (for reference only)
Installation and User Instructions R01128-8 09/15 Page 45

Technical Data

Solar Heat Pump Cylinder Range
Reference	300
Weight [kg]	58
Reheat time# [mins]*	10
Average draw off temperature [°C]	61
Hot water draw off capacity# (l)* / Draw off flow rate (l/s)	1460.50
HX performance [kW]*	19
Heat Loss [kWh]*	1.96
Dedicated solar volume (l)*	141
Height [mm]	2065
Outer Diameter [mm]	580
HW Outlet [mm]	1840
T&P valve [mm]	1840
Secondary Return [mm]	1245
CW Inlet [mm]	180
Bottom Immersion [mm]	970
Solar Return [mm]	180
Solar Flow [mm]	515
Heat Pump Return [mm]	965
Heat Pump Flow [mm]	1620
Bottom Thermostat [mm]	240
Top Thermostat [mm]	1415

Table 11: Solar Heat Pump Cylinder Dimensions

Note: All measurements are taken from the base of the cylinder to the mid-point on the item.

* Determined in accordance with EN12897.

# Auxiliary values

GDC Group Ltd	Heat Pump Cylinder Range – Product Fiche
Reference	Energy Rating	Standing Loss [W]	Storage Volume [L]
ECS300HPST-580	B	82	287

Table 12: Solar Heat Pump Cylinder Product Fiche

Solar Heat Pump Cylinder Range
Reference	300
Actual capacity [L]	300
Materials
- inner cylinder	Duplex stainless steel LDX2101
- outer cylinder	HIPS
- inlet/outlet	Stainless steel
- coils	Stainless steel twin coil
- insulation	60mm PU foam (GWP=1, ODP=0)
Maximum operating conditions
- potable water temperature	70°C
- heating water temperature	95°C
- operating pressure	3 bar
Cold water supply
- minimum dynamic pressure	1.5 bar
- maximum pressure	12 bar
- minimum flow rate	15 l/min
Connections
- cold water inlet	22mm stainless steel
- hot water outlet	22mm stainless steel
- solar coil flow and return	22mm stainless steel
- heat pump coil flow and return	28mm stainless steel
Coil specification
- heat pump coil surface area [m2]	2.8
- solar coil surface area [m2]	1.1
- heat pump coil rating [kW]*	49
- solar coil rating [kW]*	19
Immersion heater	1 3⁄4 F BSP 3kW
Thermostatic control
- direct input	integral immersion heater thermostat and cut out
- indirect input	integral twin thermostat (10 to 70°C) and cut out (~85°C)
Safety components
- pressure reducing valve and strainer	3 bar
- expansion relief valve	6 bar
- temperature and pressure relief valve	7 bar/90°C
- factory pressure test	12 bar
Other features	Over 60% in volume from recycled materials#
	Surface mounted sensor devices for compatibility and ease of maintenance
Approvals	KIWA approval number:- 1112704
Guarantee
- inner cylinder	25 yrs
- immersion heaters	2 yrs - excluding the effects of lime scale
- other components	2 yrs - excluding expansion vessel membrane pressure

Table 13: Solar Heat Pump Product Features
* Determined in accordance with EN12897.

Not including insulation

9.1 Cylinder heat exchanger pressure drop

Figure 16: Heat exchanger pressure drop for 0.8m^2 and 1.1m^2 coils

Figure 17: Heat exchanger pressure drop for a 2.8m^2 coil

10 User Instructions

10.1 General

"This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning the use of the appliance by person responsible for their safety." "Children should be supervised to ensure they do not play with this appliance."

Please read the following statements carefully as it affects your warranty:

Please ensure that the installer has fully completed the Benchmark Checklist on the inside back pages of this document and that you have signed it to say that you have received a full and clear explanation of its operation. The installer is legally required to complete a commissioning checklist as a means of complying with the appropriate Building Regulations Part G3 (England and Wales), Part P of Northern Ireland and Section 6 of Scotland.

All installations must be notified to Local Area Building Control either directly or through a Competent Persons Scheme. A Building Regulations Compliance Certificate will then be issued to the customer who should, on receipt, write the Notification Number on the Benchmark Checklist.

This product should be serviced annually to optimise its safety, efficiency and performance. The service engineer should complete the relevant Service Record on the Benchmark Checklist after each service.

The Benchmark Checklist will be required in the event of any warranty work.

10.2 Operation

Once the system has been fully commissioned, no user intervention should be required to fully enjoy the comfort and benefits of the unvented hot water cylinder.

The hot water temperature can be set to various requirements. For operation with a solar system it is recommended to set the auxiliary hot water temperature to between 45°C and 55°C (this is between 2 and 3 on the dial, please refer to Figure 19 for approximate settings). Higher temperatures can cause tripping of the high limit thermostat, introduce more heat loss from the unit and increase the risk of scalding significantly.

The solar thermostat should be set to the highest temperature possible to maximise solar gains. However, safety (scalding) and limescale build up have to be considered.

When turning on a hot tap for the first time after a heat up period there might be a short surge of water. This is normal in unvented systems and does not constitute a fault. Sometimes the water may appear milky – this is due to very fine air bubbles in the water which will clear quickly.

10.2.1 Water temperature direct electric heating

Before removing the cover from the immersion heater isolate appliance using isolating switch! Danger of electrical shock! Only use suitable electrically insulated equipment when working inside immersion housing.

The hot water temperature achieved by the direct electric heating element can be adjusted by removing the cover from the immersion heater and adjusting the dial up or down as indicated in Figure 18.

Dial to adjust water temperature

E 3 2 Safety 4 5 1 N L Earth (green/yellow) Neutral (blue) Live (brown)

Figure 18: Adjustment water temperature direct electric heating element

10.2.2 Water temperature auxiliary heating

The water temperature achieved by the auxiliary heating system depends on the setting of the thermostat on:

- the cylinder AND

- the auxiliary / solar heating source

The adjustment at the cylinder is carried out on the twin thermostat fitted to the cylinder as shown in Figure 19. In the event that the high temperature cut-out engages, it will be necessary to manually reset the thermostat. Use a suitable electrically insulated tool to push the manual reset button and inform the installer.

Manual re-set Dial to adjust water temperature Dial position Approx. temperature °C 1 40 2 48 3 56 4 64 5 72

Figure 19: Adjustment water temperature auxiliary source

10.3 Maintenance

The maintenance of this appliance must be carried out by a suitably qualified person only. It is recommended to maintain the unit on an annual basis. Isolate all electrical supplies from the unit before commencing work. Danger of electrical shock! See Section 7.

10.4 Troubleshooting

Fault	Cause	Solution
A No water from hot water taps	A.1 Stop valve closedA.2 Strainer blockedA.3 Pressure reducing valve fitted against flow	A.1 Open stop valveA.2 Turn water supply off, clean strainer and re-commissionA.3 Re-fit with arrow showing in direction of flow
B No hot water	B.1 Timer/Programmer not set correctlyB.2 Auxiliary heating malfunctionB.3 Direct heating malfunctionB.4 Auxiliary/direct heating high limit thermostat has trippedB.5 Solar malfunction	B.1 Set timer/programmer correctlyB.2 Consult auxiliary heating system instructionsB.3 Call for qualified person to check immersion heaterB.4 Reset limit thermostat(s) and inform installerB.5 Check solar loop function and settings on solar control unit
C Intermittent water discharge through tundish on warm-up	C.1 Expansion vessel lost charge	C.1 Check expansion vessel (see commissioning/maintenance), top up or replace
D Continuous discharge	D.1 Pressure reducing valve not workingD.2 Pressure relief or T&P valve not seating correctlyD.3 Malfunction of high limit thermostat or appliance	D.1 Check pressure after valve and replace if faultyD.2 Manually lift valve once or twice to clear debris, otherwise replaceD.3 Check function of thermostats and appliances
E Leakage from casing	E.1 Compression/threaded joints not formed correctly	E.1 Re-seal joints with care
F Hot water from cold tap	F.1 Hot pipe work being routed adjacent to cold pipe workF.2 Leaking seal in mixer tap	F.1 Insulate hot pipe work or re-routeF.2 Replace seals in mixer tap
G Metallic noise from system	G.1 Pipe work not sufficiently supported	G.1 Add extra pipe work fixings
H Humming noise from system during re-heat	H.1 Air in systemH.2 Flow rate well in excess of specification	H.1 Bleed system thoroughly and re-pressurizeH.2 Reduce pump speed

MAINS PRESSURE HOT WATER STORAGE SYSTEM COMMISSIONING CHECKLIST

This Commissioning Checklist is to be completed in full by the competent person who commissioned the storage system as a means of demonstrating compliance with the appropriate Building Regulations and then handed to the customer to keep for future reference.Failure to install and commission this equipment to the manufacturer's instructions may Invalidate the warranty but does not affect statutory rights.Customer Name Telephone NumberAddressCylinder Make and ModelCylinder Serial NumberCommissioned by (print name) Registered Operative ID NumberCompany Name Telephone NumberCompany Address Commissioning DateTo be completed by the customer on receipt of a Building Regulations Compliance Certificate*:Building Regulations Notification Number (if applicable)

ALL SYSTEMS PRIMARY SETTINGS (indirect heating only)
Is the primary circuit a sealed or open vented system?	Sealed □	Open □
What is the maximum primary flow temperature?		°C

ALL SYSTEMS

What is the incoming static cold water pressure at the inlet to the system?				bar
Has a strainer been cleaned of installation debris (if fitted)?	Yes		No
Is the Installation In a hard water area (above 200ppm)?	Yes		No
If yes, has a water scale reducer been fitted?	Yes		No
What type of scale reducer has been fitted?
What is the hot water thermostat set temperature?				°C
What is the maximum hot water flow rate at set thermostat temperature (measured at high flow outlet)?				l/min
Time and temperature controls have been fitted in compliance with Part L of the Building Regulations?			Yes
Type of control system (If applicable)	Y Plan		S Plan	Other
Is the cylinder solar (or other renewable) compatible?	Yes		No
What is the hot water temperature at the nearest outlet?				°C
All appropriate pipes have been insulated up to 1 metre or the point where they become concealed			Yes

UNVENTED SYSTEMS ONLY
Where is the pressure reducing valve situated (If fitted)?

What is the pressure reducing valve setting?			bar
Has a combined temperature and pressure relief valve and expansion valve been fitted and discharge tested?	Yes	No
The tundish and discharge pipework have been connected and terminated to Part G of the Building Regulations		Yes
Are all energy sources fitted with a cut out device?	Yes	No
Has the expansion vessel or internal air space been checked?	Yes	No

THERMAL STORES ONLY
What store temperature is achievable?
What is the maximum hot water temperature?

	°C
	°C

ALL INSTALLATIONS

The hot water system complies with the appropriate Building Regulations	Yes
The system has been installed and commissioned in accordance with the manufacturer's instructions	Yes
The system controls have been demonstrated to and understood by the customer	Yes
The manufacturer's literature, including Benchmark Checklist and Service Record, has been explained and left with the customer	Yes

Commissioning Engineer's Signature
Customer's Signature
(To confirm satisfactory demonstration and receipt of manufacturer's literature)

Commissioning Engineer's Signature

Customer's Signature(To confirm satisfactory demonstration and receipt of manufacturer's literature)

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©Heating and Hotwater Industry Council (HHIC)
*All installations in England and Wales must be notified to Local Authority Building Control (LABC) either directly or through a Competent Persons Scheme. A Building Regulations Compliance Certificate will then be issued to the customer.

SERVICE RECORD

It is recommended that your hot water system is serviced regularly and that the appropriate Service Record is completed.

Service Provider

Before completing the appropriate Service Record below, please ensure you have carried out the service as described in the manufacturer's instructions.

SERVICE 1 DateEngineer NameCompany NameTelephone NumberCommentsSignature	SERVICE 2 DateEngineer NameCompany NameTelephone NumberCommentsSignature
SERVICE 3 DateEngineer NameCompany NameTelephone NumberCommentsSignature	SERVICE 4 DateEngineer NameCompany NameTelephone NumberCommentsSignature

SERVICE 5 DateEngineer NameCompany NameTelephone NumberCommentsSignature	SERVICE 6 DateEngineer NameCompany NameTelephone NumberCommentsSignature
SERVICE 7 DateEngineer NameCompany NameTelephone NumberCommentsSignature	SERVICE 8 DateEngineer NameCompany NameTelephone NumberCommentsSignature
SERVICE 9 DateEngineer NameCompany NameTelephone NumberCommentsSignature	SERVICE 10 DateEngineer NameCompany NameTelephone NumberCommentsSignature

Dimplex a division of GDC Group Ltd

Millbrook House Grange Drive, Hedge End, Southampton SO30 2DF

Tel.: [phone]

e-mail: [e-mail]

www.dimplex.co.uk