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.
Limiting valve settings.
5.
System pressure.
6.
Flow and return temperature. The difference must
be 5 - 10 °C
Correct any fault before continuing.
VENTILATION SYSTEM
Check the following:
1.
The air filter. Clean or replace if necessary.
2.
Any dirt on the fan. Clean if necessary.
3.
Ensure that the ventilation openings are not blocked.
4.
The airflow. Adjust if necessary.
5.
Ensure that the damper motor is not blocked.
Correct any fault before continuing.
SAFETY VALVES
F730 has three safety valves, two for the water heater
and one for the climate system.
The function of the safety valves must be checked reg-
ularly. The valves are accessed via the service hatch.
Perform checks as follows:
1.
Open the valve by turning the knob anti-clockwise
carefully.
2.
Check that water flows through the valve.
3.
Close the valve by releasing it. If it does not close
automatically when released, turn it anti-clockwise
slightly.
4.
The climate system may need to be refilled after
checking the safety valve, see the section “Filling
the climate system”.
Service actions
EMERGENCY MODE
Emergency mode is used in event of operational inter-
ference and in conjunction with service.
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 at the immersion heater is controlled
by the thermostat (FQ10-BT30). It can be set either
to 35 or 45 °C.
• The compressor is off and only the fan, heating medi-
um pump and the electric additional heat are active.
The additional heat power in emergency mode is set
in the immersion heater card (AA1). See page 31 for
instructions.
DRAINING THE WATER HEATER
The water heater can be drained via the safety valve
(FL1) or via the overflow cup (WM1).
1.
Disconnect the overflow pipe from the safety valve
(FL1) and connect a hose to a draining pump instead.
If a draining pump is not available, the water can be
released into the overflow cup (WM1).
2.
Open the safety valve (FL1).
3.
Open a hot water tap to let air into the system. If
this is not sufficient, detach the pipe connection
(XL4) on the hot water side and ensure that air is
entering.
CLEANING THE WATER HEATER
To clean the water heater, remove the upper panel and
the insulation. Then open the flange for easy access.
DRAINING THE CLIMATE SYSTEM
In order to carry out service on the climate system, it
may be easier to drain the system first.
NOTE
There may be some hot water when draining
the heating medium side/climate system. There
is a risk of scalding.
The hot water can be drained through the safety valve
(FL2) via the overflow cup (WM1) or through a hose that
is connected to the safety valve’s (FL2) or the drain
valve’s (XL10) outlet.
1.
Open the safety valve (FL2) or the drain valve (XL10).
2.
Set the vent valves for the climate system (QM20),
(QM22), (QM24), (QM26) in the open position for
air supply.
NOTE
The heat pump should not, after draining, be
exposed to risk of freezing because a certain
of water remains in the coil.
NIBE F730Chapter 9 | Service54
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