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IMPORTANT INFORMATION
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there is no risk to people or property.
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Table 1
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.
6 720 802 172 (2012/06)
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
THE BENCHMARK SCHEME
3
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