Daikin EWAP460MBYN [244/452] Free cooling on ambient temperature

Daikin EWLD480MBYNN [244/452] Free cooling on ambient temperature
Functional Control for a Standalone Unit ESIE05-07
2–48 Part 2 – Functional Description
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2.13 Free Cooling on Ambient Temperature
Introduction When ambient temperature is low, cool water can be made easily by direct heat exchange with
ambient air. Free cooling can work on ambient or difference between inlet water temperature and
ambient temperature.
When free cooling is activated a 3 way valve will be closed.
Free cooling can only be used if the changeable digital output "free cooling" is selected in the service
menu.
Free cooling function is only active if unit is on.
It is possible to work with indirect or direct free cooling on ambient temperature.
With indirect free cooling the water of the load circulates through a separate heat exchanger instead
of through the chiller. A second water circuit circulates through the other side of that heat exchanger.
In direct free cooling it is the water from the load that is directly cooled by the ambient air.
Applicable units Only applicable on units with an ambient sensor.
Function
description
Depending on the settings and according to the function below free cooling is requested or not.
Mode: Free cooling on ambient:
P When free cooling is active, turn off compressor.
P When deactivating free cooling, there is a leadtimer to startup the compressors.
P When freecooling is active, it is possible to select whether the pump contact must be closed or
opened.
(The setpoint and the difference can be set in the user settings menu)
1. Air-cooled 2. Evaporater-
less unit
3. Water-cooled
unit
4. Condenser-
less units
EWTP EWAP/EWAD ERAP EWWD EWLD
HR CO CA HP RC
Floating
setpoint
O O -- -- O
T ambient Free cooling setpoint
Free cooling requested
T ambient
Free cooling setpoint + free cooling
difference
free cooling is reset
FCSetAmb
FCDiffAmb
Reset free cooling
Request free cooling
T ambient
ESIE05-07.book Page 48 Wednesday, October 11, 2006 10:42 AM

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