MAINTENANCE AND OPERATING MANUAL
Electronic controller
HAS T 070÷140
70
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.
6.7.7.3Unloading and recovery
If, during recovery, the condensing pressure in the circuit reaches the unloading threshold, recovery is deactivated and the
circuit is set to unloading mode. Recovery can restart after the pressure has fallen to below a programmed reactivation after
unloading value.
The icon in the main menu indicates the presence of the heat recovery function on the unit. During heat recovery, the
icon becomes key .
6.7.8 Regulation
The parameters for control of the unit's temperature regulation operation can be set up in the menu.
The masks of the regulation menu offer the facility to:
• define the setpoint type and the reference probe for regulation
• define the reference probe for regulation in heat pump mode
• define the regulation type as neutral zone or PID, and the regulation band for operation in chiller and
heat pump mode
• define parameters KI, KD, Wind-up and sampling time for PID regulation
• define the compressors start time lags in and outside the neutral zone and the time lag between
compressor stops outside the neutral zone
6.7.8.1Setpoint types
You can set one of the following setpoint types on the display:
•Fixed
• Double
• Compensated
• By time band
• Adjustable
FIXED SETPOINT
• A fixed setpoint value can be defined for operation in chiller mode and for operation in heat pump mode.
DOUBLE SETPOINT
• You can define two different setpoint values on the display and switch between them by means of a digital
input.
• For operation in heat pump mode you can set a further two different setpoint values and switch between them
with the same digital input as that of chiller mode.
COMPENSATED SETPOINT
• The setpoint is variable and it is calculated in accordance with a reference room temperature in accordance
with the following diagram:
The reference setpoint is the chiller or heat pump fixed setpoint depending on the unit's operating mode.
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