MAINTENANCE AND OPERATING MANUAL
Electronic controller
HAS T 070÷140
67
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
6.7.6 Anti-freeze
In the menu you can set the parameters for operation of the anti-freeze heater and the pump in anti-freeze mode.
The menu is accessible by means of the service level password and with the anti-freeze heater or anti-freeze pump enabled.
The masks of the anti-freeze menu offer the facility to:
• set the reference probe, the setpoint and the differential for activation of the anti-freeze heater
• set the reference probe, the setpoint and the differential for activation of the anti-freeze pump
6.7.6.1Anti-freeze heater
Activation of the anti-freeze heater prevents the formation of ice in the evaporator. If the selected reference temperature is
lower than the programmed setpoint, the heater is activated. The heater is switched off if the temperature becomes higher
than setpoint + differential, in accordance with the following diagram:
The reference probe can be selected from among the following:
•BEWIT
•BEWOT
•BTWOT
•BAT1
•BAT2
• average among BATs
• lower among BATs
•BEWOT1
•BEWOT2
• lower among BEWOTs
A probe can be selected only if it is effectively present in the unit.
The anti-freeze heater is enabled from the display, by accessing the CONFIGURATION menu with the manufacturer level
password. Enabling can be one of three alternative types:
• always
• only with compressors stopped (both for thermoregulation and for unit power-off)
• only with unit running (both with compressors running or stopped due to thermoregulation).
The icon in the main mask indicates that the anti-freeze heater is enabled in the unit. The icon changes to if the
heater is on.
6.7.6.2Anti-freeze pumps
The pumps in the unit can be started in anti-freeze mode to prevent the formation of ice in the unit's hydraulic circuit. If the
unit is stopped and the selected reference temperature is lower than the programmed setpoint, one of the pumps is started.
The pump is switched off if the temperature becomes higher than setpoint + differential, in accordance with the following
diagram:
To Next Page
Loading...