Code no.
907.40.62
Dated 10/2015
- 30 -
4.4
Electrical connections
4.4.1
General description
Only authorised, specialist personnel is permitted to open electrical housings and work on
the electrical system after de-energising the equipment. When creating connections, make
sure the terminal assignments and polarity are correct. Protect the control unit and electrical
components against excess voltage.
Danger!
Risk of fatal electric shock as a result of incorrect electrical connections.
Electrical connections must exclusively be created by electricians
approved by energy suppliers and as per the locally applicable
regulations.
Disconnect the supply voltage prior to any work.
4.4.2
Control unit connections
The fresh water station control unit is pre-wired.
Only the power supply needs to be connected.
Where applicable, connect circulation (pump and temperature sensor).
Refer to the separate control unit operating manual for more detailed information.
5
S t a r t - u p
Complete installation of all hydraulic and electrical components is a precondition for
commissioning.
5.1
Leak testing and filling the system
Check all system components, including all pre-fabricated elements and stations, to ensure
they are leak-tight; seal any detected leaks accordingly. When doing this adapt the test
pressure and test duration to match the respective piping system and the respective
operating pressure.
5.1.1
Drinking water side
Fill the drinking water side with clean drinking water as per DIN 1988 only; bleed the air from
the system by gradually increasing the pressure. Open all taps and fully bleed the drinking
water side.
Note:
Cavitation may develop as a result of excessive flow speeds; this
may damage the flow sensor.
5.1.2
Heating side
Only fill the heating system, including the primary side of the fresh water system, with filtered,
possibly treated water as per VDI 2035; bleed the system completely.
Summary of Contents for FRIWA 50
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