Setting Up The Primary Circuit - Danfoss VACON NX Commissioning And Maintenance Manual

2 4 VACON
is decreasing, look for the leak by soaking the pipe connections with soap-liquid. When the leak is
located tighten the connection and redo the pressure test.
If the pressure test is done with water the leaks can be located visually, therefore no soap-water is
necessary.
5.1.6 Setting up the pr imar y cir cuit
Before filling the system with liquid, check that all pipes and hoses are
connected. The maintenance valves V160...V162 are plugged so that no
accidents can occur during operation. During maintenance these plugs must
be replaced with hose nipples or similar parts so that a hose can be connected
to the valve.
The valve handle positions before pre-filling the system are as following:
•
Valves V161...V162
•
Valve V160
•
Valve V140
•
Valves V301...V302
•
Valves V310...31x
A hose must be connected to the manual de-airing valve, V162 that is positioned on top of the HX11
plate heat exchanger. The other end of this hose should be pointed into a drain or into a tank
depending on which system is used for the filling procedure. The system used for filling should be
able to produce at least 2 bar and delivery at least 15 l/min.
There are many ways of adding water to a piping system like the
primary circuit. The two most common ways of filling are presented
next. Which of these are used depend on if the site has a fresh water
system or if the water has to be filled from a tank.
Figure 5.1-11 shows how to connect the hoses to the HX-unit if there
is no pressurized fresh-water system at hand.
•
Connect a suction pump outlet to the filling valve V161.
Secure the connections with a hose clamp.
•
Connect the drain hose to the manual de-airing valve V162
and put the other end of the hose in the barrel. Secure the
connection with a hose clamp.
•
during the filling and de-airing.
•
If corrosion inhibitors are used they can be mixed, in the right
amount, with the water in the barrel.
•
Depending on the system size there has to be 20-200 litres of
liquid in the barrel.
5
open (violet colour in Figure 5.1-10)
lever down (brown colour in Figure 5.1-10)
closed (yellow colour in Figure 5.1-10)
closed (see P&ID, Figure 4.2-2)
open (see P&ID, Figure 4.2-2)
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COMMI SSI ONI NG
Figure 5.1-10
Figure 5.1-11