APC ACRD200 Installation Manual download pdf (Page 21)

13InRow RD Fluid Cooled Operation and Maintenance

Cooling Group Configuration

Use the cooling group configuration settings to add cooling units to the group and to define group

operation. The system automatically assigns the state of Backup to units in the group. A unit whose Role

Override setting is set to ON will automatically be set as a Primary cooling unit. A unit in the Standby

or Failed state is not considered a potential backup unit. The system periodically reviews the state of the

units to maintain the proper number of ON and Backup units. If no units are available to assign to the

Backup role, then the No Backup Units Available alarm is initiated.

Caution: This procedure is to be performed by APC authorized personnel only. The settings

in the Configure Group menu are defined by APC authorized personnel when the cooling

group is commissioned.

Configure the cooling group

Path: Main > Configure Group

The Configure Group menu contains settings that identify the number of cooling units installed in this

cooling group and the physical arrangement of those cooling units.

Num Units. Enter the number of cooling units in this cooling group. Up to 12 cooling units can be

joined together to work as a single cooling group.

Type. Set the rack deployment strategy for the cooling units of this cooling group

• Spot: The cooling unit is used as a stand-alone unit.

• In-Row: Air flow is not ducted. Hot-aisle air is cooled and the cooled-air supply is shared by all

loads in the row.

• RACS (Rack Air Containment System): Air flow in the enclosure is controlled by a ducting

system fitted to the enclosure.

• HACS (Hot Aisle Containment System): Air flow in the room is controlled by enclosing the hot

air aisle. The loads share an enclosed common hot aisle.

Capacity Ctrl. Set the capacity control of the cooling unit:

• Disc (Discrete): The cooling unit operates as a room air conditioner. The evaporator fan speed will

remain constant at the user setting and the compressor will cycle on and off to maintain the cool

setpoint.

Note: The Disc mode is only available in a Spot cooling configuration.

• Prop (Proportional): The cooling unit matches the cooling output to the load demand. This is

accomplished using hot gas adjustment and fan speed control. Load demand is determined by the

cool setpoint and the temperature sensor at the rear of the cooling unit (in Spot configurations) or

the temperature sensor at the front of the load rack (in In-Row and RACS configurations).

Fan Cntrl. This selection allows air flow to be controlled automatically by the cooling unit or manually

by user-selected fan speed preference. This property only applies to Spot (Proportional), InRow, RACS

and HACS deployments.

• Auto: Air flow is automatically controlled by the unit.

• Manual: the air flow is fixed to the value of the Fan Speed Preference property. See page 15 for

more information.

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APC ACRD200 Installation Manual Page 21