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Cooling performance parameter settings 44
Cooling performance parameter settings
In this section
Cooling performance parameter settings overview ..................................................................................... 44
Cooling performance parameter settings overview
The MCS unit has several cooling performance parameter settings. These settings control the fan speed
and water flow to meet the rack-mounted component's cooling needs.
The temperature of the server intake air is constantly controlled by the opening and closing of the solenoid
actuated water valve inside the MCS unit. When the server intake air temperature goes above the Server
Intake Temperature Set Point the water valve opens. When the server intake air temperature falls below
the Server Intake Temperature Set Point minus the Hysteresis Value, the water valve closes.
The speed of the fan units is constantly controlled through the control system using the server intake and
server exhaust temperatures.
Parameter Function
Server Intake
Temperature Set
Point
Used to control the desired air temperature going into
the front of the servers
Hysteresis Value Used to control the server intake temperature range and
optimize the water valve cycle frequency
High Temperature
Threshold
Used to issue a Critical alarm if the high temperature
threshold temperature is exceeded
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