Control the Environment, Setpoints, Supply Air

Control the Environment

The main function of the cooling unit is to remove waste heat and return treated air to the room at the required temperature. The control strategies employed by the cooling unit depend upon the deployment strategy of the cooling group.

In an In-rowenvironment, the cooling unit supplies constant-temperature supply air to the common cold aisle. The fan speed is modulated to ensure that the required volume of air reaches the IT equipment. The fan speed is determined by the difference between the cooling setpoint and the maximum rack air inlet temperature of the cooling group.

In a RACS environment, the front and rear of the IT equipment racks are fully enclosed. Waste heat is funneled directly to the return air of the cooling unit so the heat cannot escape into the room. Cool air is delivered directly from the cooling unit to the IT equipment racks.

In a Spot cooling environment, the cooling unit operates like traditional computer room air conditioning (CRAC) equipment, providing a constant return air temperature. In Disc (Discrete) mode, the fans operate at a user-selectable speed (Fan Control) and the compressor operates at maximum capacity. In Prop (Proportional) mode, the fans are modulated to maintain the required return air temperature and the compressor output is modulated to maintain the necessary supply air temperature.

Setpoints

Path: Main > Set Group Setpoint

A setpoint is the target value that a cooling group will maintain. The default setpoints are appropriate for most cooling applications.

Default setpoints:

•Cool: 22.2°C (72.0°F)

•Deadband: 1.0°C (1.8°F)

•Supply Air:

15.0°C (57 – 59.0°F) Spot (Proportional) only 17.8°C (64.0°F) RACS or In-Row

Note: The Supply Air setting is defined by APC authorized personnel only when the cooling group is commissioned.

Note: The Supply Air setpoint must never be set higher than the Cool setpoint.

•Fan Spd: When the unit is programmed for RACS mode, this property specifies the necessary temperature difference (DT) across the IT equipment. When the cooling unit is programmed for Spot (Proportional), In-Row, or RACS with the Fan Control property set to Manual, this property defines the fan speed. When the cooling unit is programmed for Spot (Discrete), the fan speeds are also selected from the following table but the Fan Control property is irrelevant.

–Low: 16.7°C (30°F) DT (60% of maximum fan speed)

–Med-Low:13.9°C (25°F) DT (70% of maximum fan speed)

–Med: 11.1°C (20°F) DT (80% of maximum fan speed)

–Med-High:6.3°C (15°F) DT (90% of maximum fan speed)

–High: 5.6°C (10°F) DT (100% of maximum fan speed)

InRow SC Operation

ACSC101, ACSC100 specifications

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