CLIVET WSAN-YMi 21, Manual For Installation, Use And Maintenance, Page: 45 / 156

45
Example
Check the water circuit
The units are equipped with a water inlet and outlet for connection to a water circuit.
The units should only be connected to closed water circuits.
Connection to an open water circuit would lead to excessive corrosion of the water piping.
Only materials complying with all applicable legislation should be used.
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 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.
Water volume and expansion vessel pre-pressure checks
The units are equipped with an expansion vessel (5/7/9kW models:2L; 12/14/16kW models:5L) 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 25L (for 5/7/9 kW
unit, the minimum volume is 15L) .
Refer to 14 General technical data to find the total internal water volume of the unit.