68
Installation
The discharge pipe should always be open to the atmosphere, free
of frost and in continuous slope to the down side in case that water
leakage exists.
In case of a recirculation circuit for the DHW circuit, the following
elements are required:
Nature No. Part name
Piping
connections
1 Supplementary water inlet of DHW tank
2 DHW tank outlet
Field supplied
3 Water check valve
4 Water pump
5
A Recirculation water pump (eld supplied):
This
water pump (3) will help to correctly recirculate the hot
water to the DHW inlet.
A Water check valve (eld supplied):
This accessory (3) is connected after the recirculation
water pump (4) in order to ensure the nonreturn of
water.
Two Shut-o valves (eld supplied) (5):
One before the recirculation water pump (4) and other
after the water check valve accessory (3).
correct direction. Otherwise, serious damages may occur in
the DHW tank.
8.1.8.2.2 MINIMUM REQUIRED WATER VOLUME
The following part shows the minimum water volume in the
system for product protection (anti-hunting) and temperature
drop at defrosting.
Minimum required water volume in each single water circuit of
DHW / SWP for product protection (anti-hunting).
Water volume in each single water circuit of DHW / SWP need
Minimum required water volume in single water circuit of space
cooling for product protection (anti-hunting).
The following table shows the minimum water volume needed
in single water circuit of space cooling.
Model 044/060(2.0HP/2.5HP) 080(3.0HP)
Minimum required
water volume
30L 45L
8.1.8.2
Requirements and Recommendations for
Hydraulic Circuit
8.1.8.2.1 REQUIREMENTS FOR ANTI-FREEZING
and the ambient temperature is very low, the water
inside the pipes and the circulating pump may freeze,
thus damaging the pipes and the water pump. In
these cases, the installer shall ensure that the water
temperature inside the pipes does not fall below the
freezing point. In order to prevent this, the unit has a
self-protection mechanism which should be activated
(refer to “8.1.9.5 DIP Switch Setting of PCB1”).
Even if the unit is stopped, the water pump may run
under some circumstances, i.e, when the anti-freezing
function is triggered.
Keep the unit power on and water system unblocked to
prevent water freezing, otherwise an alarm may occur.
will occur to stop the whole system.
If machine is stopped for a long period of time in winter,
drain out water in circuit and water pipes to prevent
freezing.
Auxiliary electric heater connected. It is advisable to
install the Auxiliary electric heater for those models in
which these are not supplied but optional.
However, in case of a power failure or unit failure, these
functions cannot guarantee protection.
Minimum required water volume during defrosting.
The following table shows the minimum water volume
needed in single water circuit of space heating in case of safe
defrosting.
Lowest possible operation
water temperature in
single water circuit of
space heating
044/060
(2.0/2.5HP)
080(3.0HP)
61 L 61 L
20-25°C 99 L 99 L
15-20°C 158 L 158 L
10-15°C 198 L 198 L
The values shown on the table are based on theoretical
To calculate minimum water volume the internal water volume
Consult with local technical engineer under the special
occasions where operation water temperature in single water
circuit of space heating is lower than 20°C.
8.1.8.2.3 MINIMUM REQUIRED WATER FLOW
Check that the water pump of the water circuit works within
unit minimum value.
Model
044(2.0HP) 8.3
060(2.5HP)/080(3.0HP) 10.0
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