Ambient Temperature; Ambient Relative Humidity - Fujitsu M10 Installation Manual

Table 2-5 Environmental conditions (continued)
Item
Temperature
conditions
*1 No condensation is assumed regardless of temperature and humidity conditions.
*2 Only the SPARC M10-1 and the PCI expansion unit can be installed in an office. Install the SPARC M10-4/M10-
4S in a dedicated room such as a server room.
*3 All the altitudes indicate heights above sea level.
2.5.1

Ambient temperature

To maintain system reliability and operator comfort, the optimal ambient temperature
is 21°C or higher but less than 23°C (70°F or higher but less than 74°F). This
temperature range makes it easy to maintain the relative humidity. While the system
is operating within this range, even a failure of the air conditioning facilities does not
cause it to suddenly stop.
2.5.2

Ambient relative humidity

To process data safely, the optimal ambient relative humidity is 45% or higher but
less than 50%. The reasons for this are as follows:
A humidity in the optimum range can protect the system from corrosion issues
■
caused by high humidity
A humidity in the optimum range means that even a failure of the air conditioning
■
facilities does not cause the system to suddenly stop
A humidity in the optimum range can prevent failures and malfunctions caused
■
by electrostatic discharge
A relative humidity that is too low is conducive to generating a static electricity
discharge. The resulting intermittent interference may cause a failure or temporary
malfunction.
Electrostatic discharge is more likely to occur and harder to eliminate at locations
with a relative humidity below 35%. Electrostatic discharge becomes a critical issue
In operation
- When installed at 0 m to 500 m (0 ft.
to 1,640 ft.)
5˚C to 35˚C (41˚F to 95˚F)
- When installed at 500 m to 1,000 m
(1,644 ft. to 3,281 ft.)
5˚C to 33˚C (41˚F to 91.4˚F)
- When installed at 1,000 m to 1,500 m
(3,284 ft. to 4,921 ft.)
5˚C to 31˚C (41˚F to 87.8˚F)
- When installed at 1,500 m to 3,000 m
(4,925 ft. to 9,843 ft.)
5˚C to 29˚C (41˚F to 84.2˚F)
Chapter 2 Planning and Preparing for System Installation
Not in operation Optimal
condition
39