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9.30 CONFIGURATION OF THE FAN SPEED IN FREE COOLING
This window is used to configure the inverter fan signals during the free cooling
operation:
Fans
Freecooling
Delta T:
Max V Freecooilng:
Delta T: value generated at the maximum fan speed at a design external air tem-
perature;
Max volts Freecooling: maximum fan voltage during the free cooling operation.
Used in silenced units to reduce noise;
WARNING: this mask is available on free cooling units.
9.31 FREE COOLING CONFIGURATION (YIELD CONTROL)
This window allows to set the parameters related to the free cooling yield control
management;this check constantly verifies that the free cooling coil generates a
delta T;
Used as a safety check on the operation of the 3-way valve. The control is active only
with ventilation at maximum air flow:
Installer
Freecooling
Control of gain
Delta T:
Time:
Delta T: delta T generated at the maximum fan speed;
Control time: yield control bypass time given by the input in free cooling;
WARNING: this mask is available on free cooling units.
9.32 MANAGEMENT OF THE VALVES ON THE NYB/NRV UNIT
Installer
NYB/NRV StandBy
Valves closed:
Enables the boiler as replacement: this parameter indicates whether or not to close
the valves for the passage of water in the evaporator when the units are in stand-by:
— NO: the water will pass in the evaporator when the machine is in stand-by;
— YES: the water will not pass in the evaporator when the machine is in stand-by;
9.33 VPF MANAGEMENT (GENERAL PARAMETERS)
This window is used to set the general parameters for the VPF (Variable Primary
Flow):
Variable primary ow
Enable:
15.0°C
Di erential pressure.
Setpoint:
10.0V
Di .:
Integral:
Enable: this value indicates whether to activate or deactivate this mode; the pos-
sible states are:
— No: VPF management disabled;
— Yes: VPF management enabled;
Setpoint: indicates the pressure value that the regulation tries to maintain at the
ends of the evaporator, by opening and closing the bypass valve;
Diff.: differential used when regulating the bypass valve;
Integral: integral time used when regulating the bypass valve;
9.34 VPF MANAGEMENT (BYPASS 1 PARAMETERS)
This window is used to set the bypass parameters for the VPF (Variable Primary
Flow):
Variable primary ow
Bypass min:
Bypass max:
Transd. 4mA:
1.5°C
Transd. 20mA:
180s
Bypass min: this value indicates the minimum Volts corresponding to the mini-
mum water bypass. All the water passes through the system;
Bypass max: this value indicates the maximum Volts corresponding to the maxi-
mum water bypass. All the water recirculates through the bypass;
Transd. 4mA: this value indicates the mbar at 4mA read by the differential trans-
ducer;
Transd. 20mA: this value indicates the mbar at 20mA read by the differential trans-
ducer;
No
NO
150mbar
100mbar
180s
4.0V
8.0V
0mbar
1000mbar
27
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