Metering For Domestic Rhi Installations; Volumiser Tanks - Grant Aerona3 Series Installation And Servicing Instructions

Do not use the heat pump to treat industrial
process water, swimming pool water or do-
mestic drinking water. Install an intermediate
heat exchanger for all of the above cases.
WARNING
3.6.4 Remote Controller
For details on how to install the remote controller, refer to Section 7.
For setting, refer to Section 9.

3.7 Metering for Domestic RHI Installations

The current OFGEM requirements for the metering of ASHP installations for
the domestic RHI involve both 'metering for payment' and 'metering for
performance'.
.

3.8 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 return to the heat pump. Refer to Figure 3-4.
A 'Volumiser' tank will be required for the Grant Aerona³ HPID13 & 17 (13 &
17kW) heat pump when:
• The overall system volume is less than 100litres
OR
•
If the part of the system connected to the heat pump is less than 30 litres
during the normal operation of the system
For example:
• When the heating zone valves(s) are closed leaving only the primary
circuit to a cylinder connected to the heat pump,
OR
•
When the hot water zone valve is closed leaving a heating zone (or
zones) connected to the heat pump
The 'Volumiser' tank must be large enough to ensure that the volume of that
part of the system will be at least 30 litres.
When operating at the factory default flow temperature of 55°C (parameter
4130) for domestic hot water production, a 'Volumiser' tank is NOT required
for the Grant Aerona³ HPID6R32 (6kW) or HPID10R32(10kW) heat pumps.
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 do change the pump output
level.
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.
A 'Volumiser' tank will only be required for the Grant Aerona³ HPID6R32
(6kW) and HPID10R32 (10kW) heat pumps when:
• The above mentioned system conditions exist AND the heat pump
is operating at a flow temperature of 60°C for domestic hot water
production.
A 30 litre 'Volumiser' tank, suitable for this purpose, is available from Grant
IRL (product code: HPIDVOL30IR). For further information, please contact
Grant IRL on +353 (0)57 91 20089
Page 12 Section 3: Installation Information