25-75 kW
User's and Installation Guide
25
The basic environmental requirements for operation of the UPS system are:
• Ambient Temperature Range: from +5 to +40 °C
• Recommended Operating Range: from +20 to +25 °C
• Maximum Relative Humidity: 95 %, noncondensing
It is required to arrange ventilation of the UPS room. Sufficient amount of air cooling is needed to keep the
maximum room temperature rise at desired level:
• Temperature rise of max. +5 °C requires the airflow of 600 m³ per 1 kW of losses
• Temperature rise of max. +10 °C requires the airflow of 300 m³ per 1 kW of losses
An ambient temperature from +20 to +25 °C is recommended to achieve a long life of the UPS and batteries.
The cooling air entering the UPS must not 40 °C. Avoid high ambient temperature, moisture, and
humidity.
The UPS ventilation requirements are shown in the following table:
Table 3-4: Air conditioning or Ventilation Requirements During Full Load Operation
Rating
Heat Rejection (kW)
Heat Rejection (BTU/h x 1000)
25 kW
1.2
4.1
50 kW
2.4
8.2
75 kW
3.6
12.3
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