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•
Always use material that are compatible with the water used
in the system and with the materials used in the unit.
•
Make sure the hose is connected to the pressure relief valve
to avoid any water coming into contact with electrical parts.
•
Air vents must be provided at all high points of the system.
The vents should be located at points which are easily
accessible for servicing. An automatic air purge valve is
provided inside the heat pump. Check that the air purge
valve can operate.
•
Take care that the components installed in the pipework can
withstand the water pressure and temperature.
•
Always ensure that the materials used in the system are
compatible with the water being used and the materials used
in the unit.
! WARNING !
Never leave the unit unattended during installation or
servicing when the service panel is removed.
3.7.3
SLEEVING FOR PIPES AND CABLES
All pipes passing through external walls should be individually
sleeved, using either copper or plastic pipe for the sleeve.
The inside diameter of this sleeving should be large enough to
accommodate the insulation on heating system pipes, usually at
least 6mm larger than the outside diameter of the insulation.
It is important that the sleeve is correctly built into the wall
structure using a cement mortar or suitable filler.
The annular gap between the pipe/insulation and the sleeve
should be even all round with at least one end sealed with
a mastic sealant, to prevent the ingress of water or vermin
whilst allowing the pipe to move and maintain the fire-resistant
properties of the structure.
Whilst not essential, it is also recommended as good practise to
sleeve any cables passing through external walls, following the
basic requirements as given above. This will make it easier to
remove/replace any cables in future, should it be necessary.
! WARNING !
Be sure to use only specified accessories and parts for
installation works. Failure to use specified parts may result
in water leakage, electric shocks, fire, or the unit falling
from its mount.
3.7.4
SYSTEM CONNECTIONS
The system connections of the heat pump must be carried out
using the flexible hoses, valves and fittings supplied with the heat
pump controller kit.
The hydraulic circuit must be completed following the
recommendations below:
1.
It is important to install the isolation valves between the
heat pump and the building (supplied with the heat pump
controller kit).
2.
The system must have drain cocks at the lowest points.
3.
Air vents must be included at the highest points of the
system.
4.
A system pressure gauge must be installed upstream of the
heat pump.
5.
All pipework must be adequately insulated and supported.
6.
The presence of solid particles in the water can obstruct the
heat exchanger. Therefore, protect the heat exchanger using
a magnetic filter such as a Grant Mag-One Duo magnetic
filter.
7.
After system assembly flush and clean the whole system,
paying particular attention to the state of the filter.
8.
A new installation must be thoroughly flushed and cleaned
before filling and adding biocide/inhibitor.
Section 3: Installation Information
! WARNING !
Do not touch water pipes during and immediately after
operation as the pipes may be hot and could burn your
hands.
3.8
METERING REQUIREMENTS
Regulations came into force on the 22nd May 2018 which
require that all air source heat pump installation are metered for
performance to meet Ofgem requirements. This stipulates that
all ASHPs must be fitted with one (or more) electricity meters to
record and display the electricity used by:
•
The ASHP
•
Any supplementary heater for space heating controlled by
the same control system as the ASHP (for example, an
immersion heater in a buffer tank).
•
Any immersion heater used to heat domestic hot water
controlled by the same control system as the ASHP (for
example, using a Grant Automatic DHW boost kit).
It must be understood that this metering is only to record the
amount of electricity being used by the ASHP installation to allow
users to monitor the energy consumption and performance of their
system.
The electricity meter(s) used may be installed as either a separate
'stand-alone' meter for each device used (this may required up
to three meters being used on a single installation) or a single
'stand-alone' meter for all devices used. Where a single meter is
used for more than one device, a separate sub-consumer unit will
also be required to provide separate protection and isolation for
each device concerned.
The electricity meters used must be MID compliant and Class A or
better, remembering that classes B and C are better than A!.
3.9
SYSTEM VOLUME REQUIREMENTS
Grant Aerona 290 heat pumps requires a minimum heating
system volume of 5 litres per useful kW. Refer to table 3-12 below
Table 3-12: System volume requirements
Model
Output (kW)
HPR2904
HPR29065
HPR2909
HPR29012
HPR290155
This volume is to ensure the system always has sufficient
thermal capacity for the heat pump, allowing the heat output to
be dissipated during normal operation, and also to assist in the
defrost operation as and when that occurs.
This system volume can be achieved in one of several ways, as
follows, depending on the system design and type:
a.
Using an Open-loop (or partial open loop) system, where
the volume of the system pipework always open to the heat
pump will usually exceed the required minimum volume (as
given in Table 3-12).
It will be necessary to determine the actual system pipework
volume to confirm that this exceeds the required minimum
volume for the size of heat pump used.
b.
Using an S-plan system, or where other controls can isolate
sections of the system pipework, e.g. UFH actuators, and the
required minimum volume cannot be guaranteed at all times,
a volumiser tank will be needed to achieve the required
volume.
A 'Volumiser' tank is simply an insulated vessel used to increase
the volume of the system to meet minimum volume requirements.
It will generally only have two connections, one inlet and one
outlet.
Grant UK offer an insulated 50 litre Internal volumiser fitted with
a 3kW immersion heater to be installed on the return to the heat
pump. This is designed to provide both the necessary volume
and, when required, assistance for defrost functions in cold
ambient temperatures.
Minimum volume (L)
4.0
20
6.5
32.5
9.0
45
12.0
60
15.5
77.5
Page 23
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