69
Installation
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.
The unit is equipped with an air purge valve (factory
supplied) at the highest location of the unit. If this
location is not the highest of the water installation, air
might be trapped inside the water pipes, which could
cause system malfunction. In that case additional air
ensure no air enters the water circuit.
mean of an external pump and an open circuit to avoid
air bags.
8.1.8.2.4 Additional Information about HYDRAULIC
CIRCUIT
8.1.8.3
WATER FILLING
(1)
the hydraulic circuit (see “8.1.8.1 Additional hydraulic
necessary elements).
(2) Make sure all the valves are open (water inlet/outlet
installation components).
(3) Ensure that the air purge valve of the unit is open when
installation (turn the screw cap of air purge valve twice
at least).
(4) Check that the drain pipes connected to the safety valve
(keep the outlet of drain pipes located in the drain pan)
are correctly connected to the general draining system.
The safety valve is later used as an air purging device
(5) Fill the water circuit with water until the pressure
displayed on the controller reaches 2.0 ± 0.2 bar. During
all the operation conditions, the normal pressure range
of water circuit is 1 ~ 2.5 bar.
to operate the safety valve manually so as to help with the air
purging procedure.
(6) Remove as much air from inside the water circuit as
possible through the air purge valve and other air vents
in the installation (fan coils, radiators...).
(7) There are two methods to start the air purge procedure:
a. Using the master controller to start air purge.
(Refer to the master controller manual)
b. Using DSW4-1 of the PCB1:
DSW4-1 ON: Start air purge
DSW4-1 OFF: Stop air purge
(8) If a little quantity of air is still remaining in the water
circuit, it will be removed by the automatic air purge
the air in the installation has been removed, a reduction
of water pressure in the circuit is very likely to occur.
pump until water pressure returns to approximate 2.0
bar.
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