APC IN ROW RD ACRD101 User's Guide download pdf (Page 23)

16InRow RD 100-Series and InRow RD 200-Series User’s Guide

• Fan Speed Preference — The preferred fan speed for normal operation of the cooling unit.

Selecting the RACS or HACS mode sets the desired temperature difference between the rack inlet

air temperature and the rack outlet air temperature.

• Fan Speed Control (Spot Proportional, In-Row, RACS or HACS cooling modes)—The method

the units will use to control fan speed, Automatic or Manual.

– Automatic—The unit controls the evaporator fan speed based on cooling demand.

– Manual—The evaporator fan speed is fixed at a constant speed. Use the Fan Speed

Preference setting to define the default speed.

Configuration page

Use the settings on the Configuration page to define how the units will divide the cooling load:

• Number of Units in Group—Specify the number of units in the group. Valid values are 1–12.

Note: If you only have one air conditioner, select 1 from the Number of Units in

Group drop-down list and define the group settings.

• Number of Backup Units—Specify the number of backup units in the group. Valid values

are 0–11.

• Run-Time Balancing Enable—Enable this option (the default setting) to balance the unit run

time across the units in the group and to ensure that all units have consistent operating time.

Disable this option if the unit is using the Spot Cooling mode.

• Load Assist Enable—Define whether the backup units will assist the primary units when the

cooling demand exceeds the cooling output capacity of the primary units.

• Configuration Type—The air flow control strategy the Group uses. You can change this setting

only when all of the units in the group are in Standby mode.

– Spot—The unit regulates the Return Air Temperature. The Rack Inlet Air Temperature sensor

is ignored for control purposes. Use this option for standalone units only.

– Rack Air Containment System (RACS)—Air flow in the enclosure is controlled by a

ducting system fitted to the enclosure.

– Hot Aisle Containment System (HACS)—Air flow in the room is controlled by enclosing

the hot air aisle.

– In-Row—Air flow is horizontal to allow in-row operation of cooling solutions. (Backup and

Load Assist functions are disabled in InRow mode.)

Only an APC Field Service Engineer may change these values:

• Cool Gain “P”—Set the proportional multiplier to correct for differences between the selected

control sensor's actual temperature and the setpoint.

• Cool Reset Rate “I”—Set the integral multiplier to correct for the proportional offset.

• Cool Derivative “D”—Set the derivative multiplier to counteract overshoot and droop during

changes in the room load.

Units page

View a list of units in the group. For each unit, view its location, unit-type, application firmware version,

and IP address.

To ensure optimal group performance, confirm that the units use the same application firmware version.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 75 76

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APC IN ROW RD ACRD101 User's Guide Page 23