Instructions for installation and use
Akva Lux II VXe
© Danfoss | Produced by Danfoss Redan A/S | 2021.02 | 11
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7. FILLING THE SYSTEM WITH WATER
Test and connections
Before filling the system with water, retighten all the pipe connec-
tions because vibrations and shocks during transport and handling
may have caused leaks. Once the system has been filled with wa-
ter, tighten all the pipe connections once more before performing
pressure test for leaks. After heating of the system, check all the
connections and retighten if necessary.
Please note that the connections feature EPDM rubber gaskets!
Therefore, it is important that you DO NOT OVERTIGHTEN the union
nuts. Over-tightening may result in leaks. Leaks caused by over-
tightening or failure to retighten connections are not covered by
the warranty.
Filling, start-up
Before filling the system with water, retighten all the pipe connec-
tions. Once the system has been filled with water, tighten all the
pipe connections once more before performing pressure test for
leaks. Before filling the system with water and starting-up, check if:
- pipes are connected according to the circuit diagram,
- expansion vessel is connected,
- heat meter is mounted,
- shut-off valves are closed,
- threaded and flanged connections are tightened,
- recirculation, if any, has been established.
Filling the heat exchanger / the system with water:
• The pump must be switched off when filling the system with
water.
•
Open the ball valves for the HE supply and return flow and
fill the system with water and at the same time venting the
system.
•
Fill the heat exchanger / the system with water until the ma-
nometer shows a working pressure, which corresponds to the
system approx. 5 m (approx. 1.2 - 1.5 bar).
•
Finally open the remaining ball valves and heat up the sy-
stem.
•
After filling and heat-up of the system it should be vented by
means of the air vents on the substation, if any and on the
radiators.
•
Then switch on the pump.
* Note
: There is no filling valve inside the station. For refilling use
a refill hose, customary for heating systems.
Filling of water to
the heating system must be done outside the substation,
typically by connection to a cold water supply in the house-
hold installation.
