Site Preparation Guide - HP Integrity rx1620

System Specifications
Environmental Specifications
Chapter 2
16
Environmental Temperature Sensor
To ensure that the system is operating within the published limits, the ambient operation temperature is
measured using a sensor placed on the system board. Data from the sensor is used to control fan speed and
also to initiate system overtemp shutdown.
Nonoperating Environment
The system is designed to withstand ambient temperatures between -40° C to 70° C under nonoperating
conditions.
Cooling
CPU/Memory Cooling
The chassis incorporates front to back airflow across the processors and memory and through the HDD
backplane. Four fans, mounted vertically in the center of the chassis, pull air through the processor and
memory sections, and push air through the PCI section.
Each fan is controlled by smart fan control circuitry embedded in the system board. The smart fan control
circuitry receives fan control input from the system fan controller in the system board, and returns fan status
information to the system fan controller. The smart fan circuitry controls the power and the
pulse-width-modulated control signal to the fan and monitors the speed indicator back from each of the fans.
The fan status LED is driven by the smart fan circuitry. The location of the fan status LED is on the control
panel of the system.
Bulk Power Supply Cooling
Cooling for the power supply is provided by two externally mounted fans. Air is pushed through the power
supply by the fans and exhausted out the rear of the chassis.
Air is ducted out of the rear of the chassis with minimal leakage into the cell airflow plenum.
PCI/Mass Storage Section Cooling
Four fans located in the center of the chassis provide airflow for all of the PCI slots. The fans are controlled
by the system temperature and run at the speed necessary to maintain proper internal temperature
throughout the chassis.
The air is pulled through openings in the front of the chassis and the mass storage devices, and pushed
through the PCI card cage.
Perforation is provided between and above the PCI card cage to allow proper exhaust ventilation to maintain
the required temperature rating of the PCI cards.