Airedale OnRak 3kW 35kW - Manual (Page 48)

LogiCool
™ OnRak
Active Cabinet Exhaust
IT Cooling
48
IT Cooling
Technical, Installation and Maintenance Manual :6912497 V1.5.0 02_2013
Modes of Operation
Temperature Neutral Mode
When operating in temperature neutral mode, the unit ensures the “Air Off” temperature is matched to the
valve temperature setpoint irrespective of the surrounding room temperature. This mode of temperature
control only considers the individual server unit load and not the impact of other equipment in the room on
the surrounding environment.
Air Off Temp.
Sensor No. 1
Air Off Temp.
Sensor No. 2
Air Off Temp.
Sensor No. 3
Air Off Temp.
Sensor No. 4
Heat lost to air
AIR OFF
20˚C
AIR IN
20˚C
Air In Sensor
Server Air Off Temperature
Sensors regulate the fan speed
to maintain a constant cabinet
temperature of 40°C
Server
Air Off
Sensor
No. 1
Server
Air Off
Sensor
No. 2
Server
Air Off
Sensor
No. 3
Server
Air Off
Sensor
No. 4
Air Off temperature is
matched to the valve
temperature setpoint
(air on) by modulating
the 3-way valve to
adjust the flow of
water through the coil