In “cool” mode, considering that the chiller setpoint by default is set to 7°C, the parameter b15 must not have a value greater than or equal
to 6 to ensure that the new setpoint set from the 0-10V input can achieve values below the antifreeze activation threshold (4°C).
9.8 Hydraulic pump operation
The hydraulic pump can be set according to one of the three following types of operation:
• operation on call of the temperature controller (default)
• operation on call from the temperature controller with periodic activation
• continuous operation
The pump is switched off immediately if the flow switch alarm is activated in manual reset.
The pump instead is always on if the antifreeze heaters are operating or if the hydraulic pump in antifreeze mode operation is activated.
The operation in antifreeze mode is activated if the adjustment temperature drops below P04 °C (default 5°C), it is disabled if the adjustment
temperature rises above P04+P05 °C (Default value of P05=2.0°C).
The pump adjustment is proportional (see Point 9.8.4).
9.8.1 Operation on call from temperature controller (Default)
In this user mode (P03=1, default), the pump is activated upon request of the temperature controller; and after a time delay of 20 seconds
from the pump start up, also the compressor activates. In power off, instead, the pump is switched off with a delay time of 120 seconds from
the call with the temperature controller in off status (off status coinciding with the compressor power off).
With flow switch alarm active in automatic reset the pump is however turned on even if the compressor is off.
If the machine operation is enabled from the remote “on-off” digital input (see Point 9.10), the circulator is immediately activated for a time
of 2 minutes, regardless of the temperature control inside the unit (the activated water recirculation allows the correct activation of the
temperature control).
0 - 10 V Input [V]
New setpoint [°C]
Setpoint set
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