Pressure Test - Danfoss VACON NX Commissioning And Maintenance Manual

COMMISSIONING
5.1.5 Pr essur e test
A pressure test has already been per formed on the HX-unit before delivery but because some of the
connections are made on site, additional pressure testing is required. The pressure test per formed
on site should be done according to EU-directives or national regulations, whichever has priority on
site.
The safety valve V120 (marked orange in Figure 4.2-3) in the primary circuit is
set to 6 bar and has to be removed during the pressure test. The V120 valve
connection must be plugged during this pressure test.
!
During the pressure test the de-airing valve AD11 (Figure 5.1-9) has to be
closed. The threaded top plug must be replaced with tight plug or add an extra
NOTE
seal under the top plug. After the test change back the originally plug, tighten to
end and then open 360 degrees.
To ensure that every site connection is sufficiently tightened, it is recommended that a
pressure test be performed for the primary circuit using pressurized air. The
pressurized air can be added through the liquid filling point of the unit, e.g. at valve
V161 in the primary circuit.
When performing a pressure test on the HX-unit, generally acknowledged safety
standards, EU directives and national regulations must also be followed. Use
safety goggl es.
Unless national regulations say otherwise the pressure during the pressure test should be 1.5 times
the maximum work pressure.
The maximum pressures are as follows:
Primary circuit AISI 304 piping = 6 bar, therefore the test pressure is 9 bar
Secondary circuit AISI 304 piping = 10 bar, therefore the maximum test pressure is 15 bar
Option: Secondary circuit AISI 304 piping = 16 bar, therefore the maximum test pressure is 24 bar
Primary circuit PVC-C piping = 6 bar, therefore the test pressure is 9 bar
Secondary circuit PVC-C piping = 10 bar, therefore the maximum test pressure is 15 bar
If the customer only uses a PN6 piping system on the secondary circuit, the pressure test can be
done with pressurized air to 9 bar.
If the secondary circuit is pressure tested higher than 10 bar the test must be
done with water. Compressed air should not be used at pressures over 10 bar
due to the risk of high-speed debris at a compressed pipe failure.
The pressures mentioned here are only valid for the HX-unit. The customer
and/or end-user are responsible for all other piping made to either the primary
or secondary circuit. If the customer and/or end-user make any changes to the
WARNING
piping on the HX-unit they are responsible for them.
The pressure in the primary circuit can be monitored from the pressure indicator PI11 during the
pressure test. If the pressure remains constant for 15 minutes, the system is airtight. If the pressure
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VACON
Figure 5.1-9
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