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The System is controlled by the step regulator (Thermoregulator). When the unit is running the electronic temperature control displays the actual water temperature, which is measured at the fresh water return from fan coils. The temperature control has 2 set points (ST): ST1 1 (COOL) for summer cooling at +12° C
ST 2 (HEAT) for winter heating.(only for units with heat option) at +40°C. The control box is equipped with:
• "Control" switch (0-1) is the main switch for the units with cool mode only.
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• "Mode" change over switch (COOL-OFF-HEAT) in case the system is equipped with "heat" function. This switch selects the running mode for summer or winter operation and in the meantime starts the unit.
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• "FLOW" light (red) which lits when the fresh water flow is not enough and the safety flow switch has cut the system out. In the same time the step regulator displays a value of -6° C (Cool mode) or +60° C (Heat mode). The system will come back automatically as the fresh water flow returns to the correct value (see also 5.3)
• "POWER" light (green) which indicates that the box is connected to mains supply.
• "RESET" yellow push button used to reset the compressors safeties. The compressors will restant automatically within 6 minutes after the reset.
• "LP", "RUN" and "HP" lights for boats for each compressor, indicating respectively an alarm for low pressure, the run situation and the high pressure alarm on each individual compressor.
• Compressor 1-2..."On-Off" switch to be used to cut out all or individual compressors for pump test, for limiting the system capacity.
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