GB
11
SUMMARY TABLE OF ALARMS
(*) The refrigeration circuit alarm is activated if the temperature difference between the water inlet and outlet (after a few minutes
of compressor operation) is insufficient (refrigerant charge, three-phase compressor turning "backwards", inversion valve
blocked…).
5.8 - SPECIAL OPERATING FEATURES
• Reduction of water volume:
- the controller uses a self-adapting algorithm that analyses the compressor's operating time and can indicate deviations
of the current set point (and the corresponding hysteresis) in case of too short operating times (in order to extend the
operating times),
- for special applications, in which case the dimensioning of the unit and the circuit are carefully designed, this function
can be deactivated. To do this, set the parameter C08 to 0 in the "CP" section of the parameterization menu.
• Defrosting (in heating mode only):
- if the temperature detected by probe SD3 drops below the frosting temperature (dependent of the outside temperature),
a time counter is activated. This counter records the operating time in icing conditions. This status is indicated by the
flashing frosting indicator lamp (7),
- after an accumulated operating time of 30 minutes, a defrosting operation is launched (inversion of the refrigerating cycle
and shut-down of the fan) until the temperature detected by probe SD3 rises above the end of frosting temperature
threshold. The defrosting phase is indicated by the (steady) illumination of indicator lamp (7).
Note:
The ventilation can restart after defrosting is completed to prevent excessive pressure build-up.
For special climatic conditions, the factory-set time counter value of 30 minutes can be adjusted. To do this, modify
parameter d03 in the defrosting section "dFr".
• Condensation pressure control
:
- the ECH controller is equipped with a variable voltage regulator for the
fan's power supply,
- based on temperature information (captured by probe SD3 placed on
the condenser), the controller varies the supply voltage of the electric
fan according to the diagram opposite,
- this system is active in cooling mode.
• Circulating pump control
:
- the pump is actuated when the unit operating or in stand-by mode,
- the pump is stopped when the unit is completely OFF. The shut-down
of the pump is delayed 1 minute after the compressor stops. An anti-
freeze device forces pump operation if the outside temperature (probe SD4) drops below 0°C,
- an "anti-sticking" device forces pump operation (if stopped) for 3 seconds every 24 hours.
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