Epsilon Echos +
8
Unit shutdown due to temperatures lower than the
functioning limit
This accessory is available for the /HP and LE/HP units. It stops
the compressors of the unit when this is in heat pump mode
and the external air temperature falls below a minimum set
temperature: the controller stops the compressors before the
unit triggers the low pressure alarm, avoiding the need to ma-
nually restart the machine.
This accessory is particularly useful when the heat pump is in-
stalled in an area where the external air temperature is almost
bound to fall below the minimum temperature threshold (in
accordance with the set-point).
When the external air temperature returns above the set tem-
perature threshold, the unit restarts automatically without the
need for any manual intervention.
For units with integrated pump, the latter is kept running to
prevent the formation of ice and to ensure correct operation of
the temperature probes and anti-freeze safety devices.
The shutdown temperature has to be configured in relation
to the set-point temperature and the operating restrictions of
the machine.
This accessory must be used in conjunction with the “Com-
pensation of the set-point depending on the external air tem-
perature” accessory.
If not specified otherwise in the order, the default settings of
the unit are:
• Summer set-point at 12°C for the return temperature with
negative summer compensation
• Winter set-point set at 40°C for the return temperature
• Shutdown of the unit when the external air temperature
• Falls below -20°C
It is possible to configure a shutdown temperature other than
the default one providing it is compatible with the unit’s ope-
rating restrictions.
Maximum and minimum voltage relay
This device monitors the supply voltage of the unit to ensure
it remains within a permissible range. When the voltage goes
outside the range, the device stops the unit to avoid damage
to the electric motors.
The device also monitors phase sequence.
Single voltage-free operating contacts
The terminal block in the control box is fitted with voltage-
free contacts that receive the signal indicating the compressor
works.
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