Components Operation - Technibel iSeries Technical Data & Service Manual

7 Components operation

Compressor
The compressor runs if the following conditions are met:
At least 3 minutes have passed since the power supply was switched on
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At least 3 minutes have passed since the compressor was stopped
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At least 6 minutes have passed since the previous compressor start
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There is no active alarm on the outdoor and indoor units
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There is no active protection
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There is a thermal load demand in the room
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Compressor stops if:
At least 3 minutes have passed since compressor start
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There is no capacity demand
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or if:
At least 3 minutes have passed since compressor start
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Protection level is too high
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or if there is any alarm active.
Fan
The fan runs only when the compressor is running and starts right after the compressor.
The fan can also run without compressor in the following conditions:
Overheating on the outdoor heat exchanger (cooling or dry mode)
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Overheating on the power electronics
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Electronic Expansion Valve (EEV)
EEV is managed based on the system conditions to meet the maximum efficiency point of operation and
to guarantee a safe operation of the system.
Every time power supply is switched on, or once per day if compressor is not running, EEV runs a reset
cycle necessary to find the correct position of the valve. During this reset cycle, EEV is completely closed
and then reopened to a fixed value.
4-way valve
4-way valve is activated when:
System is in heating mode
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4-way valve is deactivated when:
System is in cooling, dry or fan only mode
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System is off
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Defrost is active
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