Free Cooling Configuration (Yield Control); Glycol Water Management; Vpf Management (General Parameters); Vpf Management (Bypass 1 Parameters) - AERMEC PCO5 User Manual

8.31 FREE COOLING CONFIGURATION (YIELD CONTROL)

WARNING: this mask is available on free cooling units.
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:
Fans
Frecooling
Gain control.
Delta T:
Control time:
Delta T: delta T generated at the maximum fan speed;
Control time: yield control bypass time given by the input in free cooling;

8.32 GLYCOL WATER MANAGEMENT

This window is used to enable or disable the use of glycol water:
Installer
Glycol water
management.
Enable: YES
Freezing temperature of mixed
with antifreeze:
Enable: this value indicates if the unit uses glycol water; the possible states are:
— No: glycol water management is disabled;
— Yes: glycol water management is disabled;
Freezing temperature of mixed with antifreeze: With this parameter, the minimum
cold setpoint limit, the antifreeze alarm, the antifreeze resistance threshold and the
cold force off threshold are calculated.

8.33 VPF MANAGEMENT (GENERAL PARAMETERS)

This window is used to set the general parameters for the VPF (Variable Primary
Flow):
Variable primary ow
Enable: NO
Di erential pressure.
Setpoint:
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;
1.5°C
180s
0.0°C
150mbar
100mbar
180s
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;

8.34 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:
Transd. 20mA:
Bypass min: this value indicates the minimum Volts corresponding to the minimum
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;

8.35 VPF MANAGEMENT (BYPASS 2 PARAMETERS)

This window is used to set the bypass parameters for the VPF (Variable Primary
Flow):
Variable primary ow
Pressure:
Valve by-pass.
Proportional:
Integral:
Opening:
By-pass test:
Pressure: indicates the current value measured by the differential transducer;
Proportional: indicates the proportional component when calculating the bypass
opening;
Integral: indicates the integral component when calculating the bypass opening;
Opening: indicates the current valve opening command;
Test bypass: indicates the forced valve command to use as a test. set to deactivate
forcing;

8.36 UNIT INFORMATION EVD

This window shows the EVD Driver firmware version:
4.0V
8.0V
0mbar
1000mbar
647mbar
100.0%
0.0%
0.0V
0.0V
31