Handleiding
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If the power failure is more than 180 seconds, the unit will start based on the setting of the Stop-to-Start cycle timer
(minimum setting of 3 minutes) and load per standard unit without Rapid Restart.
When Rapid Restart is active, the unit will restart within 30 seconds of power restoration. The time to restore full load is
less than 3 minutes.
4.16 FreeCooling Hydronic (Cooling Only)
Freecooling is started when the outside air temperature is lower than the entering water temperature by a predetermined
freecooling delta T. Full freecooling will only be possible below a design temperature however logic will try to get the most
out of the air temperature to optimize the overall performance of the chiller.
When freecooling is started, the freecooling valve is opened to let water pass through the freecooling coils and get cooled
before entering the evaporator heat exchanger and go to the plant as leaving water temperature. Fans are started and
then controlled to maintain the leaving water temperature to the active setpoint.
If the outside air temperature is not low enough to permit full freecooling and satisfy the plant load, the unit may start the
mixed mode. In fact, if, with the fan at full speed, the leaving water temperature does not reach the active setpoint and
remains above the Stage Up Temperature with a low slope, after a predetermined time a circuit can be started in
mechanical mode. In this case, the fan speed will be adapted to control the minimum pressure ratio needed to guarantee
the correct lubrication of compressors.
Parameter
Range
Description
Input
Disable
The Option is not enabled with all the inputs necessary
Enable
The Option is correctly enabled
Remote Input
Disable
The Remote Input is not enabled with all the inputs necessary
Enable
The Remote Input is correctly enabled
State
Off
Unit’s State in Off
Free
Cooling
Unit State in Free Cooling mode, both Circuits run in Freecooling
Mixed
Unit State in Mixed mode, one Circuit run in Freecooling and the second run in
Mechanical mode
Mechanical
Unit State in Mechanical mode, both Circuits run in Mechanical
FC Max Oat
10-30 °C
Maximum value for air temperature to enable the freecooling. Above this value the
freecooling mode cannot be used.
FC Delta T
0-10 °C
Difference between entering water temperature and air temperature to enable the
freecooling operations.
FC Min Pr
1.4-3
To adjust minimum pressure ratio for fans control.
FC Max Pr
1.4-3
To adjust maximum pressure ratio for fans control.
FC Min VFD Sp
5-50 %
To adjust minimum fan speed in freecooling mode.
FC Max VFD Sp
70-100 %
To adjust maximum fan speed in freecooling mode.
In order to enable the Freecooling functionality, the customer must set to Enable the “Input” parameter in the Freecooling
page.
In case unit control source is "Network", to enable freecooling funcitonalities following conditions must be true:
1) Enable the “Input” parameter in the Freecooling page.
2) Enable BMS register: Freecooling - Enable Setpoint
4.16.1 Glycol Free Freecoling
The Glycol Free option in Freecoling condition is characterized with the presence of an intermediate water/water heat
exchanger connected to a water loop with glycol. The main water loop will be glycol free to simplify the waste water
Bekijk gratis de handleiding van Daikin EWAH990TZXRB2, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Daikin |
| Model | EWAH990TZXRB2 |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 11657 MB |
