Warranty
Please check the following before commencing start-up of the unit, as these are important conditions of the
Grant Warranty.
•A suitable filter arrangement has been installed. Grant recommends the use of their Mag
one filter which also incorporates a 1200-micron filter.
•The system should be flushed, this is especially important if the system is an old gas or oil
system. Flushing should be completed in accordance to BS7593.
•Grant recommends a suitable heat transfer is used to give a minimum frost protection of -9.
In order to stop bacterial growth, it is also recommended to use a suitable Biocide if not
included in the heat transfer solution.
•A 30lt volumiser or buffer is required for Grant Aerona 3 R32 heat pumps.
•The pipe work diameter should be no smaller than 28mm copper. If plastic pipe is used this
should be bigger.
•The external mono bloc should be installed on a base suitable for withstanding the weight
of the unit and should be level.
•There shall be a proper means of disposal of the condensate, this should be via a drain or
soak away.
•The external mono bloc should be positioned so that there is good air flow around the unit.
The minimum clearances are 100mm to the left, 600mm to the right, 300mm behind the
unit and 600mm in front. We would recommend 2m in front.
•Antifreeze should be used in the system to give frost protection to minus 9 degrees and if it
does not contain biocide, biocide should be added to protect against bacterial growth.
As part of the commissioning process, it is important that the correct flow rates are achieved for the output of
the unit. Failure to do so, will result in poor performance and protentional faults. The flow rates required are
specified below.
