APC ACRA100 Installation Manual download pdf (Page 32)

Pumped Refrigerant System Operation and Maintenance24

Control the Environment

The primary function of the Pumped Refrigerant System is to capture the heat generated by IT

equipment and neutralize it before it mixes with the room air.

Controls in the RDU monitor room conditions to ensure the leaving refrigerant temperature to the CMs is

always above the room dew point.

In a HACS or RACS environment, the CMs neutralize the heat accumulated in the common hot aisle and

expel it into the surrounding environmental space at the desired temperature.

Path: Main > Groups > Select Group > Setpoints

A setpoint is the target value that a cooling group tries to maintain. The default setpoints are appropriate

for most cooling applications.

The setpoints for each mode must be within the following ranges:

Cool Stpt. 22.2°C (66 - 90°F) This setting is only available in InRow mode.

Supply Stpt. 17.8–29.4°C (64.0–84.9°F)

Note: The Supply Stpt setting is defined by APC authorized personnel only when the group is

commissioned.

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

Fan Speed. When the CM is programmed for HACS or RACS mode and Air Flow is set to Auto, the

Air Flow property specifies the desired temperature difference (dT) across the IT equipment.

When the CM is programmed for InRow, HACS or RACS with Air Flow set to Manual, select the Fan

Speed from the following options.

• 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)

The Fan Speed setting is ignored when the CM is set to the InRow mode and Air Flow is set to Auto.

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APC ACRA100 Installation Manual Page 32