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ESIE05-07 Functional Control for a Standalone Unit
Part 2 – Functional Description 2–49
3
2
4
5
1
Remark: the lead timer and the choice for the status of the pump during free cooling can be set in the
user settings menu.
Mode: Inlet - Ambient
Free cooling on difference between inlet & ambient:
P Compressors are not turned off (no leadtimer).
P Pumpcontact always on.
Free cooling requested Free cooling reset
Indirect free cooling
P Compressor off
P Evaporator water pump on
P Digital output for 3way valve
closed
P Evaporator water pump on
P Digital output for 3way valve
opens and lead timer starts
P Compressor on when lead
timer is finished
Direct free cooling
P Compressor off
P Evaporator water pump off
P Digital output for 3way valve
closed
P Evaporator water pump on
P Digital output for 3way valve
opens and lead timer starts
P Compressor on when lead
timer is finished
Inlet evap - Ambient > FCSetInlAmb Free cooling requested
Inlet evap - Ambient < FCSetInlAmb -
FCDiffInlAmb
Free cooling is reset
InletEvap-ambientFCSetInlAmb
FCDiffInlAmb
Request free cooling
Reset free cooling
ESIE05-07.book Page 49 Wednesday, October 11, 2006 10:42 AM

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