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2.7 Checking Cooling Conditions

2.7 Checking Cooling Conditions
This section describes the cooling conditions for the SPARC M12-2. Note the following conditions when installing the system:
  1. The air conditioning facilities for the room are sufficient to meet the cooling conditions of the entire system
  2. The air conditioning facilities have control functions for preventing excessive temperature changes
Table 2-7 lists the cooling conditions for the SPARC M12-2 and PCI expansion unit.
Table 2-7  Cooling Conditions
Configuration Input Voltage Maximum Heat Dissipation Maximum Exhaust Airflow
200 to 240 VAC
10,460 kJ/hr
(9,920 BTU/hr)
15.9 m3/min
PCI expansion unit
100 to 120 VAC
1,005 kJ/hr (953 BTU/hr) 4.5 m3/min
200 to 240 VAC
972 kJ/hr (921 BTU/hr)
The SPARC M12-2 is designed to function in an environment with natural convection airflow.

The following requirements must be followed to meet the environmental specifications.
  1. Ensure sufficient airflow for the entire system.
    The SPARC M12-2 and the PCI expansion unit are equipped with a cooling function for front-to-rear cooling. Each chassis has air vents on the front. Exhaust is expelled from the rear of each chassis. The SPARC M12-2 uses internal fans whose airflow reaches the maximum exhaust airflow shown in Table 2-7 under normal operating conditions.
    Example: 15.9 m3 (561.5 ft3) per minute for each SPARC M12-2 unit
  2. Ensure that the temperature at the intake parts of the SPARC M12-2 and PCI expansion unit does not exceed the limit value.
    Other devices mounted in the rack must not cause the temperature at the intake part of any chassis to exceed the limit value. This limit value in environmental conditions assumes that the SPARC M12-2 and the PCI expansion unit operate with the rack door closed.