Operating Stability And Minimum Water Content In The System; Table 2 - Evaporator - Fouling Factor; Table 3 - Air Heat Exchanger - Altitude Correction Factor; Table 4 - Minimum Percentage Of Glycol For The Low Air Ambient Temperature - Daikin EWAT_B Series Installation, Maintenance And Operation Manual

The charts shown above constitute a guideline on operating limits in the range.
Refer to the CSS selection software for the actual operating limits in the working conditions for each model.
Legend:
2
A = Fouling factor (m °C / kW)
B = Correction factor of the cooling capacity
C = Correction factor of the absorbed power
D = EER correction factor
Legend:
A = Altitude above sea level (m)
B = Barometric pressure (mbar)
C = Correction factor of the cooling capacity
D = Correction factor of the absorbed power
- The maximum operating altitude is 2000 m above sea level.
- Contact the factory if the unit is to be installed at altitudes between 1000 and 2000 m above sea level.

Table 4 - Minimum percentage of glycol for the low air ambient temperature

Legend:
AAT = Ambient air temperature (°C) (2)
A = Ethylene glycol (%) (1)
B = Propylene glycol (%) (1)
(1) Minimum percentage of glycol to prevent freezing of the water circuit at the indicated ambient air temperature
(2) Ambient air temperature that exceeds the operating limits of the unit.
Protection of the water circuit is necessary in the winter season, even with the unit not in operation.

Operating stability and minimum water content in the system

For the correct functioning of the machines it is important to guarantee a minimum water content inside the system, avoiding
an excessive number of compressor start-ups and stops. In fact, every time the compressor starts working, an excessive
amount of oil from the compressor enters the circulation in the refrigerant circuit and at the same time there is an increase
in the temperature of the compressor stator, generated by the inrush current of the starting. In order to avoid damage to
the compressors, the control system allows no more than 10 starts per hour. The plant where the unit is installed must
therefore ensure that the overall water content allows constant operation of the unit and consequently also greater
environmental comfort.
The minimum water content per unit can be calculated with a certain approximation using the following formula must be
calculated considering the following specifications:

Table 2 - Evaporator - Fouling factor

Table 3 - Air heat exchanger - Altitude correction factor

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