78
Checking the appliance for unusual noises, e.g. oper-
ating noise of fan, compressor and pumps. Venting
again if required.
Checking the system function
■
Check the function of all system components, e.g.
circulation pumps, 3-way diverter valves.
■
Scan temperatures at the heat pump control unit.
■
Possibly check heat meter readings.
4-way diverter valve in the outdoor unit
■
The 4-way diverter valve is at zero volt in heating
mode.
■
In cooling mode, the 4-way diverter valve is live. The
heat pump is operated in reverse (refrigerant circuit
reversal).
Resetting the high limit safety cut-out
A
Fig. 61
A
High limit safety cut-out reset button
!
Please note
If the heat pump is exposed to temperatures
below
–
15 °C, e.g. during storage or transport,
the high limit safety cut-out of the instantaneous
heating water heater may respond. In this case,
the instantaneous heating water heater will not
heat up.
Heat up the high limit safety cut-out to above
20 °C. Press the reset button of the high limit
safety cut-out.
Note
The high limit safety cut-out can only be reset if the
temperature at the sensor is below 85
–
8
°C.
Instructing the system user
The system installer should hand the operating instruc-
tions to the system user and instruct the user in oper-
ating the system. This also includes all components
added as accessories, such as remote controls.
Equipment and functions of the heating system must
be entered in the form in the appendix to the operating
instructions.
The system installer should also provide information
on the required maintenance.
Commissioning, inspection, maintenance
Checking the heat pump for noise
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