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Dated 17/09/19 V1.2
ESP-HC-DHW 11DC
ESP-HC-DHW 17DC
reason, they are not included as part of the optional ASHP or buffer fittings pack. Expansion
vessels can, however, be provided by ESP as an additional optional extra.
If, as advised, you are using a buffer tank in the system, you will need to fit a suitably sized water
pump on the water distribution side of the system. This water pump will need to be wired to
receive an appropriate signal from the heating system. Because the pump must be sized
according to the requirements of the distribution system, this item is not provided by ESP as part
of any installation pack but can be provided as an optional extra. There is a water pump within
the Solis unit to provide circulation from the ASHP to the buffer tank or Low Loss Header. This is
controlled directly from the ASHP (even in standby mode) and is one of the reasons that the
ASHP should have power to it at all times.
28mm copper pipe must be used between the ASHP and the buffer tank or Low Loss Header.
The system must be sized so that the total water volume in the heat pump pipe system and buffer
tank must be at least 10 litres per KW of output. It is highly recommended that a suitably sized
buffer tank be installed between the unit and the heating distribution system. Please consult
your installer or ESP when considering this system design point – the right sized buffer tank can
make a significant difference to the economy, life span and efficiency of the unit and the heating
effectiveness.
The final connection to the heat pump flow and return must be made with suitable flexible pipes
to prevent vibration in to the system pipework. Please ensure that two wrenches are employed
to take up the torque created in tightening the fittings to avoid damage to both the fittings and
the heat pump. The flexi pipes are each attached to the ASHP via a 90° female/female fitting so
that the flexi pipes are angled downwards.
These flexible hoses are available from ESP as part of an optional ASHP Installation Pack or
individually
.
The pipe work of the whole system must be flushed and pressure tested before the heat pump is
connected, to ensure that any contaminants are removed and to avoid damage to the ASHP.
Shut-off valves and drain valves must be fitted so that unit can be emptied in the event of
prolonged power failures.
