Service actions
NOTE
Servicing should only be carried out by persons
with the necessary expertise.
When replacing components on VVM 500 only
replacement parts from NIBE may be used.
EMERGENCY MODE
Emergency mode is used in event of operational inter-
ference and in conjunction with service. Hot water capa-
city is reduced in this mode.
Emergency mode is activated by setting switch (SF1)
in mode " ". This means that:
• The status lamp illuminates yellow.
• The display is not lit and the control computer is not
connected.
• The temperature by the immersion heater is controlled
by the thermostat (FQ10-BT30). It can be set to 35 or
45 °C.
• Only the circulation pumps and electric additional heat
are active. The electrical additional heat power in
emergency mode is set in the immersion heater board
(AA1). See page 26 for instructions.
EMPTYING THE HOT WATER COIL
The hot water coil is most easily drained by detaching
the cold water pipe at the coils's entry to the reservoir.
DRAINING THE CLIMATE SYSTEM
In order to carry out service on the climate system, it
may be easier to drain the system first using drain valve
(QM1).
NOTE
There may be some hot water when draining
the heating medium side/climate system. There
is a risk of scalding.
TEMPERATURE SENSOR DATA
Voltage (VDC)Resistance
(kOhm)
Temperature (°C)
3.256351.0-40
3.240251.6-35
3.218182.5-30
3.189133.8-25
3.15099.22-20
3.10574.32-15
3.04756.20-10
2.97642.89-5
2.88933.020
2.78925.615
2.67320.0210
2.54115.7715
2.39912.5120
2.24510.0025
2.0838.04530
1.9166.51435
1.7525.30640
1.5874.34845
1.4263.58350
1.2782.96855
1.1362.46760
1.0072.06865
0.8911.73970
0.7851.46975
0.6911.24680
0.6071.06185
0.5330.90890
0.4690.77995
0.4140.672100
57Chapter 9 | ServiceNIBE VVM 500
9 Service
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