Airedale OnRak 3kW 35kW - Manual (Page 46)

LogiCool
™ OnRak
Active Cabinet Exhaust
IT Cooling
46
IT Cooling
Technical, Installation and Maintenance Manual :6912497 V1.5.0 02_2013
Dew Point Control
The pCO controller within the OnRak unit can calculate the dew point within a room by monitoring the temperature and
humidity of that room and then performing a calculation to provide a dew point value. The pCO controller uses a signal
received from the temperature/humidity sensor which is wired into the controller.
The calculated value of dew point is then used to ensure that the supply water temperature to the OnRak is never less
than two degrees below the dew point.
This ensures that no condensate or moisture build up can occur from the supply water being below the room’s dew point.
To view the dew point information simply scroll down from the main page until the following screen is displayed:
Modulated Cooling
The OnRak can modulate its cooling performance to suit the heat being produced by the servers within the cabinet. It
does this by modulating both the fan speed and the three way modulating valve to maintain the appropriate level of
cooling.
The fans are designed to control the server discharge temperature to a user defined set point, defaulted to 40°C, whilst
the three-way modulating valve is designed to match the air temperature off the fans with the air on temperature if the
unit is configured to be temperature neutral, or to maintain the room temperature if the unit is configured to work as load
neutral.