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Integrating the HPE Adaptive Rack Cooling System and IT
Rack
The HPE Adaptive Rack Cooling System is designed to supply the IT equipment with the proper amount
of cooling airflow. The HPE Adaptive Rack Cooling System fan speeds are controlled to build a slightly
positive differential pressure between the front of the IT racks and rear of the HPE Adaptive Rack Cooling
System. The IT fans increase or decrease speed as the IT load requires. The HPE Adaptive Rack
Cooling System control system senses increased or decreased pressure differences and adjusts fans
accordingly to maintain the pressure differential set point. These actions result in a neutral environment
for the IT racks, and the HPE Adaptive Rack Cooling System fans do not push more air than required
across the system. For proper operation, the HPE Adaptive Rack Cooling System measures the pressure
difference between the front of the IT rack and the rear of the HPE Adaptive Rack Cooling System.
HPE Adaptive Rack Cooling System pressure tube connections
During deployment, after the IT racks and the HPE Adaptive Rack Cooling System have been bayed
together, connect the pressure reference pickups in the IT racks to the measurement ports on the front of
the HPE Adaptive Rack Cooling System control cabinet. Then connect the pressure reference pickup in
the rear of the HPE Adaptive Rack Cooling System to the measurement ports on the rear of the HPE
Adaptive Rack Cooling System. There are two ports in the front and two ports in the rear of the HPE
Adaptive Rack Cooling System control box.
To dampen local pressure variations and give accurate ambient pressure readings, the pressure sampling
tubes consist of multiple small holes perforating a metal tube. Each tube is 18 inches long. One end is
sealed and the other end has a hose barb.
Installing the pressure sampling tubes
The parts used to perform this procedure are located in the HPE ARCS Accessory Kit and the HPE ARCS
Rack Chunk Installation Kit.
To install the pressure sampling tubes:
1. To identify the IT racks cooled by each individual HPE Adaptive Rack Cooling System, looking to the
left and right of the HPE Adaptive Rack Cooling System, examine at the final HPE Adaptive Rack
Cooling System and rack layout drawing. The farthest IT racks could be any of the following
configurations:
•
The two IT racks on either side of the HPE Adaptive Rack Cooling System
•
One rack farther away from the HPE Adaptive Rack Cooling System on either side (four IT racks
total)
•
A combination of both of the preceding configurations, with two IT racks on one side and a single IT
rack on the other side.
To ensure smooth control, when multiple HPE Adaptive Rack Cooling Systems are located in a row of
IT equipment, do not overlap the pressure measurement zones. Connect only one set of pressure
Installation
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