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System Filling/Cleansing
Check and adjust as necessary the hot water system expansion vessel(s) air pressure
to 1.5 bar.
Check that any drain valves are closed then open the incoming stop valve and fill the
domestic mains cold and hot water systems in the normal way ensuring there is no
air trapped in the system.
Check and adjust as necessary the primary heating system expansion vessel to the
figure specified (normally 1.0 bar).
Note: The expansion vessel pressures should be checked before the systems are
filled.
Fill the primary heating system with potable water through the filling loop provided
to the pressure required (normally 1.0 bar).
During filling vent air as necessary from the high points of the system including
the manual air vents provided on the appliance and on the feed to the expansion
vessel.
Check the whole of the primary heating and domestic hot and cold distribution
systems for leaks.
It is essential that all systems functions properly for optimum performance.
To achieve this, the primary system should be commissioned in accordance with good practice
and generally in accordance with the requirements of BS 6798, BS 5449 and BS 7593.
When using either cleansing or corrosion inhibitor chemical, the manufacturers
instructions must be followed.
Cleansing the Primary System
It is very important to ensure that the Primary system is cleaned using a suitable
cleansing agent such as Fernox F3 to ensure that any flux residues/installation
debris are removed.
The cleaning should be carried out fully in accordance with the manufacturers
instructions. To allow thorough flushing, full bore drain valves should be provided.
Primary Water System Treatment
Although the BoilerMate A-Class HP-DEM has no special water treatment requirements,
the radiators and other parts of the circuit will require the application of a scale and
corrosion inhibitor. The heat pump and external connecting pipework will also require
protection against freezing. For this reason a combined anti freeze and inhibitor
product such as Fernox Alphi 11 must be used.
The volumes/concentration should be calculated in accordance with the manufacturers
instructions allowing 10 litres for the volume for the primary pipework/coil in the
BoilerMate A-Class HP appliance.
We consider that in typical radiator systems, the total water volume will not exceed
80 litres. On this basis, 20 litres of Alphi-11 will provide at least the 25% concentration
recommended by the manufacturer as the minimum. However, because of the volumes
experienced in underfloor system, the system volume for these types of systems will
need to be calculated.
The Fernox Boiler Buddy supplied separately with the appliance package should be
installed internally on the heat pump return as near as practical to the heat pump
- see page 48 for further details.
INSTALLATION
Powerflushing/Cleaning Of The Heating
System
If it is proposed to 'powerflush' the heating
system always check and comply fully with
the manufacturers instructions for the
powerflushing equipment being used.
It is recommended that the heat pump and the
BoilerMate A-Class HP appliance is bypassed
during powerflushing of the primary/heating
system.
If in any doubt please consult our Technical
Helpline.
Cleansing the Hot/Cold Water System
Fully flush and, when necessary, chlorinate the
hot and cold water system in accordance with
the recommendations in the Model Water
Byelaws and BS 6700.
Remove and clean the strainer element in the
combination inlet valve, then replace it and re-
fill the systems.
Once the systems have been refilled manually
open the relief valves one by one and check
that water is discharged and runs freely through
the tundish and out at the discharge point. The
pipework should accept full bore discharge
without overflowing at the tundish, and the
valve should seat satisfactorily.
On completion, check the pressure in the
primary system is correct and disconnect the
manual filling loop.
Page 31
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