Nibe VVM 300 User Manual

8 NIBE VVM 300
User guide
LEK
+
2
0
-2
A
B
A
B
A
B
I
I
I
III
I
I
I
I
I
I
V
V
M
3
00
LEK
+
2
0
-2
A
B
A B
A
B
I
I
I
I
I
I
I
II
I
II
V
V
M
300
2
1
bar
3
04
Maintenance routines
Maintenance routines
The working range of the heating system is normally 0.5 –
1.5 bar when the system is closed. Check this on the pres-
sure gauge (42).
Checking the safety valves
52
47
VVM 300 has two safety valves, one for the heating sys-
tem and one for the hot water heater.
The heating system’s safety valve (52) must be completely
tight, but the heater’s safety valve (47) may occasionally
release some water after hot water has been used. This is
because the cold water, which enters the heater to replace
the hot water, expands when heated causing the pressure
to rise and the safety valve to open.
The safety valves must be checked regularly. Check one
valve at a time as follows:
Q Open the valve.
Q Check that water flows through the valve.
Q Close the valve again.
Q The heating system may need to be refilled af-
ter checking the safety valve (52), see the section
“Commissioning and adjustment” – “Filling the heat-
ing system”.
Pressure gauge

Nibe VVM 300 Specifications

General

Brand	Nibe
Model	VVM 300
Category	Boiler
Language	English