Service actions
NOTE
Servicing should only be carried out by persons
with the necessary expertise.
When replacing components on VVM 320 only
replacement parts from NIBE may be used.
NOTE
If an electrical connection has been disconnec-
ted and is connected, ground must be checked
using a suitable multimeter.
NOTE
An immersion heater without a temperature
limiter is not allowed to be installed.
NOTE
After servicing, complete the relevant Service
Interval Record section of the Benchmark
Checklist located at the back of this document.
Completion of the Service Interval Record is a
condition of warranty. For full terms and condi-
tions of warranty, please see our website
www.nibe.co.uk.
MAINTENANCE
General inspection
Check the following:
1.
Condition of casing.
2.
Electrical connections.
3.
Pipe connections.
4.
Alarm log.
Correct any fault before continuing.
Water heater
Check the following:
1.
Hot water start and stop temperature.
2.
Pressure controlled bypass valve.
3.
T&P valve.
4.
Overflow pipe.
5.
Pressure expansion vessel.
Correct any fault before continuing.
Climate system
Check the following:
1.
Climate system start and stop temperature.
2.
Heating curve settings.
3.
Function of the room sensor (if installed).
4.
System pressure.
5.
Flow and return temperature. The difference must
be 5 - 10 캜.
Correct any fault before continuing.
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 32 for instructions.
DRAINING THE HOT WATER HEATER
The siphon principle is used to empty the hot water
heater. This can be done either via the drain valve on
the incoming cold water pipe or by inserting a hose into
the cold water connection.
63Chapter 9 | ServiceNIBE VVM 320
9 Service
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