Section 3: Installation Information Page 9
3.2.1 System Design Criteria
A typical condensing oil or gas fired boiler operates with a flow of 70°C and
a return of 50°C, i.e. with a DT of 20°C. A heat pump operates with a flow of
between 30°C and 55°C with a DT of 8°C.
The design of any system in Ireland and the UK is typically based on the
following parameters:
1. That the outside design air temperature can fall to -3°C or lower
2. The internal design temperature can be between 18-22°C depending
on the room concerned.
3. The heat pump operates at lower water temperatures than an oil or gas
fired appliance.
Designing a new system for use with a heat pump is straight forward,
assuming the insulation properties of the dwelling meets or exceeds
current Building Regulations and the lower flow/return temperatures
are taken into account in the selection of the type and size of the heat
emitters used.
While underfloor heating is the preferred heat emitter, a combination of
underfloor heating and radiators, or radiators only, works just as efficiently. It
is necessary, however, to calculate the size of radiator required accurately – if
this is not done, the house will fail to reach the target temperature and will be
costly to rectify after the installation is complete.
When tested to BS EN 14511, the heat output for an heat pump is declared at
the test conditions of 7°C outside air temperature and 35°C or 55°C water
flow temperature.
At all other values of outside air temperature and water flow temperature the
actual heat pump output will vary, e.g. the heat output will:
• decrease with lower outside air temperatures and increase with higher
outside air temperatures at any given water flow temperature, and
• decrease with higher water flow temperatures and increase with lower
water flow temperatures at any given outside air temperature
A back-up boiler can be added to the rated output of the heat pump.
Provided that the heat pump is sized correctly for the system, this back-up
heater will only compensate for any short fall in meeting the heat load for the
property below the minimum design air temperatures.
3.2.2 Heat Emitter Sizing
For guidance on sizing heat emitters, e.g. radiators and/or underfloor
heating, refer to SR50: 2010 code of practice for building services part 1
domestic plumbing and heating.
3.1 Introduction
For the heat pump to operate satisfactorily, install it as outlined in this
installation manual.
• The Grant Aerona³ heat pump should only be installed by a competent
person.
• Before installing the heat pump, please read the following installation
information carefully and install the heat pump as instructed.
• Be sure to follow the safety notices given.
• After completing the installation, check the product operates correctly.
Then, explain to the user about the operation and maintenance
requirements as shown in this manual.
• Be sure to install the heat pump in a suitable location that can support
the heat pump when filled. Installation in an unsuitable location may
cause injury to persons and damage to the heat pump.
• Do not install in a position where there is any possibility of flammable
gas leakage such as from LPG cylinder around the heat pump. Leaked
flammable gas around the heat pump may cause a fire.
• If the leaked refrigerant is exposed to fire, poisonous gas may be
produced.
• Connect the heat pump with the flexible hoses and valves supplied, as
described in this installation manual.
• Do not use an extension cable.
• Do not turn on the power until all installation work is complete.
• Only use correct Grant IRL parts and accessories to avoid accidents
such as electric shock, fire and leakage of water.
• Never touch electrical components immediately after the power supply
has been turned off as electrical shock may occur. After turning off the
power, always wait five or more minutes before touching electrical
components.
• Be sure to connect the power supply cable correctly to the terminal block
as overheating can cause a fire.
• Ensure the wiring lid is fitted following installation to avoid electric shock
at the terminal block.
• Always connect the earth wire to the heat pump.
• Install a correctly rated circuit breaker.
• After installation, the heat pump and heating system must be
commissioned. Hand over all documentation to the end-user and
explain the operating functions and maintenance according to these
instructions.
3.2 Heating System Design Criteria
Before continuing with the installation of the Aerona³ heat pump, please
spend a few minutes confirming the suitability of the heat pump to your system.
Failure to do so may result in poor performance and wasted time:
• Has a room-by-room heat loss calculation been carried out?
• Is this system designed for mono or bivalent?
• If monovalent, total heating capacity?
• If bivalent, what is the load capacity of the heat pump?
• If bivalent, what is/are additional heat source(s)?
• Type of system design? - S-plan, S-plan plus
• Will a buffer be used?
• If yes, what is the capacity of the buffer?
• Has cavity wall insulation been installed?
• Has loft insulation of 300mm been installed?
• Have all system pipes been lagged correctly?
• Are the existing controls being upgraded?
3 INSTALLATION INFORMATION
Grant Aerona³ heat pumps should be stored
and transported in an upright position. If not,
then the heat pump MUST be positioned in an
upright position for at least four hours before
being operated.
NOTE
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