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C
Figure 3-4: Centre of gravity for 12 & 16 kW output
3.2
INTRODUCTION
For the heat pump to operate satisfactorily, install it as outlined in
this installation manual.
•
The Grant R290 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.
•
After completing the installation, check for refrigerant
leakage.
•
Never directly touch any leaking refrigerant as it could cause
severe frostbite.
•
Do not touch the refrigerant pipes during and immediately
after operation as the refrigerant pipes may be hot or cold,
depending on the condition of the refrigerant flowing through
the refrigerant piping, compressor and other refrigerant
cycle parts. Burns or frostbite are possible if you touch the
refrigerant pipes. To avoid injury, give the pipes time to return
to normal temperature or, if you must touch them, be sure to
wear protective gloves.
•
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 UK 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 all covers are fitted following installation to avoid the
risk of electric shock from electrical terminals or components.
•
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.
Page 16
3.2.1
HEATING SYSTEM DESIGN CRITERIA
Before continuing with the installation of the R290 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?
•
Has cavity wall insulation been installed?
•
Has loft insulation of 270mm been installed?
•
Is this system designed for mono or bivalent?
•
If monovalent, what is the total heating capacity?
•
If bivalent, what is the load capacity of the heat pump?
•
If bivalent, what additional heat sources are used?
•
Type of system design? Open Loop, S-plan, S-plan plus
•
Are the existing controls being upgraded?
•
Will a volumiser be used?
B
•
If yes, what is the capacity of the volumiser?
•
Have all system pipes been lagged correctly?
3.2.2
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. The Grant
Aerona 290 heat pump is designed to operate with a flow of
between 24°C and 55°C (in space heating mode) or 55°C (in
domestic hot water) with a DT of 5K.
The design of any system in the UK is typically based on the
following parameters:
1.
The outside design air temperature - This can fall to -3°C or
lower.
2.
The internal design air temperature - This can be between
18-22°C depending on the room concerned.
3.
The heat pump flow temperature - This 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 exceed 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 a heat pump is
declared at the test conditions of 7°C outside air temperature and
35°C or 55°C water flow temperature.
The nominal output for the Aerona 290 heat pump range is
based on -5°C outside air temperature and 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.
3.2.3
HEAT EMITTER SIZING
For guidance on sizing heat emitters, e.g. radiators and/or
underfloor heating, refer to the Domestic Heating Design Guide
and the Underfloor Heating Design Guide.
Section 3: Installation Information
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