MTA HAST 080 N - 6.7.2 0 Speci al Fu Ncti Ons

MAINTENANCE AND OPERATING MANUAL
Electronic controller
HAS T 070÷140
77
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.
The following diagram describes:
• Line A: High pressure unloading with stop due to setpoint-differential
• Line B: High pressure unloading with stop due to time
NOTE
If the unloading condition is no longer true, when the compressor restarts the compressors minimum time intervals are
observed.
6.7.20 Special functions
The unit's special functions can be defined in the menu.
NOTE
The menu is accessible only with special functions enabled.
The special functions are described below.
6.7.20.1Airbatic
The Airbatic function can be enabled at the time of unit configuration and only in air-water units.
The function controls a solenoid valve, which is activated if:
1. All the circuits on the unit have reached 100% of their cooling capacity
2. At least one of the condensing pressure values of the circuits in the unit has reached a programmed setpoint value
3. The average temperature of the room probes has reached a programmed setpoint value
4. The average temperature of the thermoregulation probe has reached a programmed setpoint value.
The solenoid valve is managed with minimum activation and deactivation times.
6.7.20.5Boiler
The Boiler function is enabled from the display of chiller + heat pump units, and it consists in the facility, during operation in
heat pump mode, to switch on one or more remote heaters or a water boiler to integrate/replace the unit. The two operating
modes configurable from the display are described below.
• Integrated control:
The Boiler function is activated when the average temperature of the room probes is below a programmed
setpoint and if the temperature of the thermoregulation probe is below another programmed setpoint. In this
case, the heaters or boiler are switched on and they remain on until room temperature increases to above the
setpoint plus a differential value. During activation of the function the unit continues to perform its normal
thermoregulation functions.
• Separate control:
The Boiler function is activated when the average temperature of the room probes is below a programmed
setpoint and if the temperature of the thermoregulation probe is below another programmed setpoint. In this
case, the heaters or boiler are switched on and they remain on until room temperature increases to above the
setpoint plus a differential. During activation of the function the unit suspends its normal thermoregulation
functions.
B
A
A
B
Unloading time
Unloading time
Pressure
Set
Diff