Viessmann AWO-M-AC 101.A06, Assembly And Servicing Instructions

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Check that the electrical connections have been made according to standards in force, including
earthing.

Voltage must match that on the unit’s rating plate.
 Make sure that the electric voltage is within the tolerance limits (±5%).

Check that the electric heaters of the compressors are properly powered.
 Check that there are no gas leaks.

Before switching the unit on, check that all panels are positioned correctly and well-fixed with screws.
CAUTION: The unit must be connected to the electric mains and placed in STANDBY (powered on)
by closing the master switch at least 12 hours before start-up. This will allow the heaters to
adequately warm up the compressor crankcase (the heaters are powered automatically when
the switch is closed). The heaters are working properly if after a few minutes the temperature of
the compressor crankcase is 10-15°C higher than ambient temperature.
CAUTION: check that the weight of the pipes does not bear upon the machine structure.
CAUTION: Never use the master switch to stop the unit temporarily. This must only be done to
disconnect the unit from the power supply for long downtimes (e.g. seasonal stops etc.).
Furthermore power is missing, the crankcase heaters will not be powered with the risk of
breaking the compressors when the unit is switched on.
CAUTION: Do not modify the electrical connections of the unit so as not to immediately terminate
the warranty.
CAUTION: Summer/winter operation must be selected at the start of the relative season.
Frequent and sudden changes of this operation must be avoided so as not to damage the
compressors.
CAUTION: Upon initial installation and start-up, make sure that the machine works properly both
in heating and cooling mode.
6.1 SWITCHING ON THE UNIT
To supply power to the machine, turn the external handle of the disconnector to ON (“I”).
The unit display only switches on if the phase sequence is correct (inspection to be made when
commissioning the unit).
Wait at least 1 minute between switching the unit off and back on again.
7 INSTRUCTIONS FOR THE USER
Write down the unit’s identification data to be able to give it to the assistance centre when requesting an
intervention.
The identification plate applied on the machine has all of the technical and performance data of
the appliance.
In case of tampering, removal or deterioration, ask the Technical Assistance Service for a copy.
Tampering, removal and deterioration of the identification plate complicates installation,
maintenance and request for spare parts.