Danfoss VX Solo HWS Instructions For Installation And Use Manual page 12

Instructions for installation and use
Filling, start-up
Prior to the VX Solo HWS installation all its pipes and connections
should be cleaned and rinsed. After that the dirt strainers should
be cleaned.
Due to vibrations during transport all connections must be checked
and tightened before filling and start-up.
Before starting-up, check if:
- pipes are connected according to the circuit diagram,
- expansion vessel is connected,
- heat meter is mounted,
- shut-off valves (to be ordered separately) are closed,
- threaded and flanged connections are tightened.
The pump must be switched off when filling the system with water.
• Open the ball valves for the HE supply and return flow as well
as the ball valve for DCW (ball valves to be ordered separately).
• Carefully open the fill valve and fill the system with water and
at the same time vent the system.
• Fill the heat exchanger / the system with water* until the ma-
nometer shows a working pressure, which corresponds to the
system height + approx. 5 m (approx. 1.2 - 1.5 bar).
• Close the fill valve.
• Finally open the remaining ball valves (to be ordered separate-
ly) and heat up the system.
• Remove the red split on the position indicator of the zone
valve.
• 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 ra-
Manometer and filling
If the pressure drops below 1 bar, water must be added to the system.
The operating pressure should never exceed 1.5 bar.
(The safety valve opens at 2,5 bar)
If system pressure drops dramatically within a short time, heating
system should be examined for leakage, - this includes checking
the factory set pressure of the expansion vessel.
12 DKDHR
VX Solo HWS substations
VI.HE.M1.02
Fill valve
Danfoss District Energy