Bedienungsanleitung Worcester Greenstore Ground Source (Seite 3 von 28) (Englisch)

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THE BENCHMARK SCHEME

6 720 802 172 (2012/06) 3

IMPORTANT INFORMATION

ADDITIONAL SYMBOLS

1.2 SAFETY INSTRUCTIONS

GENERAL

▶ Read the guide carefully and keep it to hand for future use.

INSTALLATION AND COMMISSIONING

▶ The heat pump may be installed and put into operation only by a

competent person.

RISK OF DAMAGE DUE TO OPERATOR ERROR

Operator errors can result in injury and damage to property.

▶ Ensure that children never operate this appliance unsupervised or

play with it.

▶ Ensure that only personnel who can operate this appliance correctly

have access to it.

SERVICE AND MAINTENANCE

▶ Only competent persons may carry out repairs. Incorrect repairs can

lead to serious risks to the user, and a reduction in savings.

▶ Only use original spare parts.

▶ Service and maintenance must be carried out annually by a competent

person.

2 THE BENCHMARK SCHEME

Worcester, Bosch Group is a licensed member of the Benchmark

Scheme which aims to improve the standards of installation and

commissioning of domestic heating and hot water systems in the UK and

to encourage regular servicing to optimise safety, efficiency,

performance and to comply with the F gas regulations.

Please ensure that the installer has fully completed the Benchmark

Checklist on the inside back pages of the installation instructions

supplied with the product 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 (England and

Wales).

All installations should be made in accordance with MCS/MIS 3005.

This product should be serviced regularly 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 may be required in the event of any warranty

work and as supporting documentation relating to home improvements

in the optional documents section of the Home Information Pack.

3 GROUND SOURCE HEAT PUMP OPERATION

As the outside temperature gets colder, the heat demand of a house

increases and the output of a ground source heat pump will decrease.

Eventually it becomes so cold outside that the output of the heat pump

alone is not able to heat the building effectively. The Greestore range of

ground source heat pumps therefore allows for monoenergetic and

bivalent operation.

Monoenergetic means that in the event of very low external

temperatures a 3-stage electrical booster heater in the indoor unit will

automatically be activated to provide additional heat if required and

keep the building warm.

In bivalent operation a second heating appliance (e.g. gas or oil boiler) is

used to supplement the heat load.

3.1 SELECTION AND SIZING OF A HEAT PUMP

It is essential that heat pump systems are designed to operate efficiently

in order to meet the building heating needs and the expectations of the

customer. In order to achieve this, the following design activities must

be completed prior to installation:-

• Pre-design assessment - Determine the suitability of a heat pump

system for the building based on the customer requirements,

expectations and building type.

• Detailed design - Complete building heat loss calculations and

domestic hot water usage assessment.

• Specification - Select a suitable heat pump and system components

based on the detailed design. Calculate and communicate the

predicted energy use and running costs of the system to the

customer.

A suitable design methodology for the above is detailed in MIS3005, the

Microgeneration Certification Scheme (MCS) heat pump installer

standard. Worcester, Bosch Group recommended that this standard is

followed for heat pump systems. The standard covers the design,

installation and commissioning requirements to ensure that 100% of the

building heat loss can be met efficiently by the heat pump system. A heat

pump system must be designed to this standard to be eligible for

government financial incentives e.g Renewable Heat Incentive (RHI).

The Worcester Bosch Group design team offer a heat pump sizing

service which is MCS compliant. To request this service, download and

submit the form using the guidance notes from our website address:

www.worcester-bosch.co.uk/hp

4 HEAT EMITTERS

Worcester, Bosch Group heat pumps are fitted with weather

compensation controls as standard. However, for a heat pump to

perform to its highest energy efficiency, the central heating emitter

circuit should be designed so that the flow temperature is as low as

possible.

As a guide, the system should be designed using the following maximum

flow temperatures;

• Underfloor heating: 35-40 °C

• Radiators: 45-50 °C

If underfloor heating has been installed, it is important to remember that

the underfloor system designer should have been informed that the heat

source will be from an air source heat pump. It is also important to

remember that radiators should have been correctly sized to work

effectively with lower flow temperatures.

A tool to aid installers and end users to understand the relevance of

building heat loss and heat emitter selection on heat pump performance,

has been created by the joint trade associations. The 'Heat Emitter

Guide' can be downloaded from the following website:

www.microgenerationcertification.org

This symbol indicates important information where

there is no risk to people or property.

Symbol Explanation

▶ Step in an action sequence

 Cross-reference to another part of the document

• List entry

– List entry (second level)

Table 1

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