Installation manual

Pumped Refrigerant System Operation and Maintenance18
Start the RDU
Path: Main > Operate > Operate
To start the RDU, Select On. The pumps will start when the pump starting conditions are met. There
must be a refrigerant reserve of at least 20% in the receiver. The Subcooler Outlet Temperature must be
less than or equal to 55°F and the Subcooler Outlet Temperature must be at least 0.3°F cooler than the
Condensing Temperature.
The RDU will run according to the configured settings.
Note: Operate only affects the local RDU. You must set the Operate option for each RDU in
the group.
Stop the RDU
Path: Main > Operate > Operate
Select Standby. The RDU will enter the standby mode and the CMs associated with the RDU will shut
down. This is not an alarm condition.
Start a CM Remotely
Path: Main > Cooling Modules > Select CM > Operate
To start the CM, select On.
Note: The CMs Local On/Off setting must be set to On for the CM to operate. Additionally,
the CM will not operate until the RDU has started the pump.
Stop a CM Remotely
Path: Main > Cooling Modules > Select CM > Operate
To stop the CM, select Standby.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
The Standby option does not remove power from the RDU. You must
disconnect power at the mains to remove power from the RDU.
Failure to follow these instructions can result in death or serious injury.