Riello 20191845, Руководство пользователя

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104
ENGLISH
Before continuing installation of the unit, check the following:
The maximum water pressure ≤ 3 bar.
The maximum water temperature ≤ 70°C according to safety device setting.
Always use materials that are compatible with the water used in the system and with the materials used in the unit.
Ensure that components installed in the field piping can withstand the water pressure and temperature.
Drain taps must be provided at all low points of the system to permit complete drainage of the circuit during maintenance.
Air vents must be provided at all high points of the system. The vents should be located at points that are easily accessible for service.
An automatic air purge valve is provided inside the unit. Check that this air purge valve is not tightened so that automatic release of
air in the water circuit is possible.
9.4.2 Water volume and sizing expansion vessels
The units are equipped with an expansion vessel of 8l that has a default pre-pressure of 1.5 bar. To assure proper operation of the unit, the
pre-pressure of the expansion vessel might need to be adjusted.
1) Check that the total water volume in the installation, excluding the internal water volume of the unit, is at least 40l . See 14 "Technical
specifications" to find the total internal water volume of the unit (in case of cascade units, refer to the table in paragraph 8.4).
NOTE
In most applications this minimum water volume will be satisfactory.
In critical processes or in rooms with a high heat load though, extra water might be required.
When circulation in each space heating loop is controlled by remotely controlled valves, it is important that this minimum water volume
is kept even if all the valves are closed.
2) Expansion vessel volume must fit the total wate r system volume.
3) To size the expansion for the heating and cooling circuit.
The expansion vessel volume can follow the figure below:
9.4.3
0
5
10
15
20
25
0 50 100 150 200 250 300 350 400
Ex
pa
ns
io
n
ve
ss
el
(l)
System water volume (l)
Water circuit connection
Water connections must be made correctly in accordance with labels on the outdoor unit, with respect to the water inlet and water outlet.
b
CAUTION
Be careful not to deform the unit’s piping by using excessive force when connecting the piping. Deforming the piping can cause the unit to mal-
function
b
WARNING
It is mandatory to install a Y inlet water filter.
If air, moisture or dust gets in the water circuit, problems may occur. Therefore, always take into account the following when connecting the water
circuit:
Use clean pipes only.
Hold the pipe end downwards when removing burrs.
Cover the pipe end when inserting it through a wall to prevent dust and dirt entering.
Use a good thread sealant for sealing the connections. The sealing must be able to withstand the pressures and temperatures of the
system.