APC ACRA100 Installation Manual download pdf (Page 28)

Pumped Refrigerant System Operation and Maintenance20

Power Source. The RDU has two AC inputs. One input is redundant. When Dual Feed is selected, an

alarm will initiate if either of the AC inputs fails. If only one feed is used, select Single Feed.

Fluid Temp High Thres. Fluid Temperature High Threshold: configure the entering fluid temperature

high threshold. An alarm will initiate when the inlet water temperature exceeds the threshold.

Bypass Mode. Enable/Disable. Select Enable to operate the Bypass Valve.

Reset Options. Run Hours: resets the run hours for the two pumps or the two DC power supplies.

Pump Fault: clears a pump fault. Pump Fault must be selected to remove a Pump Fault Alarm.

Unassign RDU. Removes the RDU from the group. Any CMs associated to the unassigned RDU will

also become unassigned.

RefrigLeak Enable. Enable or disable refrigerant leak detection. When enabled, a Critical alarm will

alert you if a loss is detected. A Warning alarm will alert you if leak detection is suspended. Leak

monitoring will continue as long as the RDU is ON, the configuration of the system has not changed, and

the total system load exceeds 3 kW.

Refrigerant Cal. Calibrates the refrigerant leak detector. The refrigerant leak detector must be

calibrated before use. Additionally, the refrigerant leak detector function must be Enabled before it can

be calibrated. See “RefLeak” on page 1 for information on Calibration Status settings. The RDU and

CMs must be ON with a minimum system load of 5kW. When calibration is complete the leak detector

will automatically start leak monitoring.

Calibrate:

• following the addition or removal of CMs.

• anytime refrigerant is added to the system.

Lead Pump. Assigns the lead pump of the two refrigerant pumps in the RDU. When the pump rotation

time is reached, the RDU will change the assignment of Lead Pump to the lag pump. See “Pump

Changeover” on page 1 to set up pump rotation time.

View and edit the state of input and output contacts:

Input Normal State. Set the normal state of the contact (open or closed). The RDU changes its

operating mode to Standby when the actual state differs from the normal state.

Output Source. Define the type of output source (alarm), either Any Alarm or Critical, that causes the

output to change from its normal state.

Output Normal State. Set the normal state of the contact (open or closed). If the state of an alarm or

event mapped to this contact changes from the normal state, the contact also changes state.

Reboot the Network Management Card.

Path: Main > RDU > Configuration > ResetOptions

Reset NMC.

The NMC is rebooted. This is done without interrupting the operation of the pumped

refrigerant system. You will be prompted for a confirmation (Yes/No).

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APC ACRA100 Installation Manual Page 28