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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.
1
Supplementary water inlet of DHW tank
Piping
connections
2
DHW tank outlet
3
Water check valve
Field supplied
4
Water pump
5
Shut-off valve
● A DHW pump (field supplied): This water pump (3) will
help to correctly recirculate the hot water to the DHW
inlet.
● A Water check valve (field supplied):
This accessory (3) is connected after the recirculation
water pump (4) in order to ensure the nonreturn of
water.
● Two Shut-off valves (field supplied) (5):
One before the recirculation water pump (4) and other
after the water check valve accessory (3).
The water check valve shall be confirmed installed in the
correct direction. Otherwise, serious damages may occur in
the DHW tank.
Part name
SPACE HEATING AND DHW
8.2 REQUIREMENTS AND RECOMMEN-
DATIONS FOR HYDRAULIC CIRCUIT
8.2.1 Requirements for anti-freezing
● When the unit is stopped during shut-off periods
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 "9.6 SETTING OF DIP SWITCHES ON 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.
● If the water system is blocked, an alarm of water flow
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.
● The anti-freezing protection is effective better with
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.
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
be greater than 40L.
●
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
Minimum required
water volume
●
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
≥25°C
20-25°C
15-20°C
10-15°C
15
100/120
140/160
(3.5HP/4.0HP)
(5.0HP/6.0HP)
60L
90L
100/120
140/160
(3.5HP/4.0HP)
(5.0HP/6.0HP)
71 L
88 L
115 L
143 L
183 L
229 L
229 L
286 L
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