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Air cooled inverter water chiller
OPERATION
MANUAL
Operation Manual
56
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
The controller integrates a PID algorithm which manages the dynamic response of the valve in
order to keep a satisfactory quick and stable response to system parameter variations. PID
parameters are embedded into the controller and cannot be changed. The EXV has the following
operating modes:
Pre-open
Pressure
Superheat
When the circuit is required to start, the EXV will go into the Pre-open. After that, the EXV can
change to Pressure Control. The compressor will start synchronously with this transition.
In Pressure control, the EXV is positioned to control the evaporator pressure. The pressure target
varies based on evaporator LWT and discharge superheat values.
When the EXV transitions to the Superheat control, the target is gradually changed until reaching
the normal calculated target. The superheat target varies to avoid that liquid refrigerant droplets
could reach the compressor. This target is constantly updated, and averaged over a 10 second
period.
The transition from Pressure Control to Superheat Control requires all of the following:
Evap LWT <= 15.5°C,
Refrigerant circuit stabilized.
The transition from Superheat Control to Pressure Control may happen only if the water
temperature increases again for any reason above the Maximum Operating Pressure (MOP) limit.
This will occur if the following condition exists:
Evap Press > 370kPa (MOP)
Whenever the circuit is running, the EXV position is limited between 5% or 100% position.
Any time the circuit is in the Off or starts the shutdown procedure, the EXV shall be in the closed
position. In this case additional closing steps are commanded to guarantee a proper recovery of
the zero position.
Expansion valve driver is equipped with UPS module to safely close the expansion valve in case of
power failure.
5.6 Economizer Control
The circuit economizer will be activated if all the following conditions apply:
Circuit in Run state
Compressor speed > Econ En Spd
Circuit Pressure Ratio > Econ Act PR
Discharge Superheat > 22°C (This condition is ignored with the EWAD TZ B)
Percent RLA < 95%
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Productinformatie
| Merk | Daikin |
| Model | EWAD620TZPLB |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 11976 MB |
