Grant Aerona 3 HPID10R32, Instructions Manual, Page: 15 / 100

Section 3: Installation Information Page 15
To determine the temperature difference between flow and return,
check the flow and return temperatures using the ‘Monitor Display
Function’ on either the remote controller or Terminal PCB. Refer
to Section 10.7 for guidance on how to check the flow and return
water temperatures.
3.10 HYDRAULIC DIAGRAMS
Hydraulic diagrams are available in Figure 4-1 and Appendices A, B
and C at the back of these installation instructions.
8. After system assembly flush and clean the whole system,
paying particular attention to the state of the filter.
9. A new installation must be thoroughly flushed and cleaned
before filling and adding anti-freeze/biocide/inhibitor.
3.7.5 REMOTE CONTROLLER
For details on how to install the remote controller, refer to Section 7.
For setting, refer to Section 9.
! WARNING !
Do not use the heat pump to treat industrial process water,
swimming pool water or domestic drinking water. Install an
intermediate heat exchanger for all of the above cases.
3.8 METERING REQUIREMENTS
The MCS Heat Pump Standard (Installation) MIS3005-I requires
that:
1. A means of recording and displaying the total electricity
consumption of the system shall be installed.
2. The heat pump(s) should be installed so that heat metering
could be added at a future date with minimum cost or
disruption.
A means of making the addition of heat metering possible with
minimum disruption would be to include straight and surface
mounted flow and return pipes near the heat pump and each
incorporate two full bore isolation valves.
Those isolation valves on the flow pipe should be separated by no
less than 175mm.
On the return pipe, those valves should be separated by no less
than 20x the pipe diameter.
For example, the distance between the valves should be 560mm or
more of straight pipe when pipe diameter of 28mm is used.
3.9 VOLUMISER TANKS
A ‘Volumiser’ tank is simply a vessel used to increase the volume
of the system, to meet the system requirements as given below.
It will have only two connections, one inlet and one outlet,
and it must be fitted in the flow from the heat pump if the
volumiser contains an immersion element that is to be used as a
supplementary heater.
A weatherproof, insulated 30 litre ‘Volumiser’ tank designed for
external installation and suitable for this purpose, is available from
Grant UK (product code: HPIDVOL30EXT). For further information,
please contact Grant UK on +44 (0)1380 736920.
Refer to Figure 4-1 and Table 4-1.
System Conditions
A ‘Volumiser’ tank is required for all Grant Aerona³ R32 heat pump
installations, except when the heat pump is connected to a Grant
combined volumiser/low loss header, buffer or thermal store.
For further information on the Grant combined volumiser/low loss
header, please refer to Grant UK DOC 0184 (supplied with the
volumiser/low loss header).
The water pump, fitted in the heat pump, is supplied factory set at
Level 3 (maximum output). It is unlikely that this level of output will
be required, so it is recommended that the pump output is reduced
to either Level 2 (medium output) or Level 1 (minimum output) as
required. This will usually be indicated by achieving a temperature
difference between the heat pump flow and return of approximately
8°C when the heating system is operating and up to temperature.
Refer to Section 8.3.6 for guidance on how to change the pump
output level.