17
SPACE HEATING/COOLING AND DHW
9.2 REQUIREMENTS AND RECOMMENDATIONS
for HYDRAULIC CIRCUIT
9.2.1 Requirements for anti-freezing
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 “10.5 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.
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
9.2.2 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
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
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.
9.2.3 Minimum required water ow
9.2.4 Additional Information about hydraulic
circuit
in order to remove possible particles remaining from
Put insulation on the pipes in order to avoid heat losses.
Whenever possible, sluice valves should be installed for
Ensure that the installation complies with applicable
legislation in terms of piping connection and materials,
hygienic measures, testing and the possible required
mixing valves.
The maximum water pressure is 3 bar (nominal opening
pressure of the safety valve). Provide adequate
reduction pressure device in the water circuit to ensure
that the maximum pressure is NOT exceeded.
The water pressure can be read on master controller,
detected by the water pressure sensor located at inlet of
plate heat exchanger. If water pressure exceeded 3 bar,
the water pressure displayed on master controller would
Ensure that the drain pipes connected to the safety
valve and to the air purge valve are properly driven to
avoid water being in contact with unit components.
in the piping circuit can withstand the water pressure
and the water temperature range in which the unit can
operate. The units are conceived for exclusive use in a
closed water circulation.
The internal air pressure of the expansion vessel will
(factory supplied with 1 bar of internal air pressure).
Drain taps must be provided at all low points of the
installation to permit complete drainage of the circuit
during servicing.
The maximum piping length depends on the maximum
pressure availability in the water outlet pipe. Please
check the pump curves.
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