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4.1.6 Alarm Settings
If glycol is present in the water circuits, factory defaults values for the Alarm Limits listed below must be adjusted:
Parameter
Description
Low Press Hold
Set the minimum refrigerant pressure of the unit. It is generally recommended to set to a value
whose saturated temperature is 8 to 10 °C below the minimum active setpoint. This will allow a
safe operation and a proper control of compressor suction superheat.
Low Press
Unload
Set lower than the hold threshold enough to allow a suction pressure recovery from fast
transients without unloading the compressor. A 20 kPa differential is generally appropriate for
most applications.
Evap Water Frz
Stops the unit in case the leaving temperature falls below a given threshold. To allow a safe
operation of the chiller, this setting must be adequate to the minimum temperature allowed by
the mixture water/glycol present in the evaporator water circuit.
Cond Water Frz
Stops the unit in case the leaving temperature falls below a given threshold. To allow a safe
operation of the chiller, this setting must be adequate to the minimum temperature allowed by
the mixture water/glycol present in the condenser water circuit.
When glycol is used in the plant, always disconnect antifreeze electric heater.
4.1.7 Power Conservation
4.1.7.1 Demand Limit
Demand limit function allows the unit to be limited to a specified maximum load. Capacity limit level is defined with an
external 4-20 mA signal and linear relationship. 4 mA indicate maximum capacity available whereas 20 mA indicates
minimum capacity available.
With demand limit function is not possible shutdown the unit but only unload it until minimum admissible capacity. Demand
limit related setpoints available through this menu are listed in the table below.
Parameter
Description
Unit Capacity
Displays current unit
capacity
Demand Limit
En
Enables demand limit
Demand Limit
Displays active demand
limit
4.1.7.2 Current Limit (Optional)
Current limit function allows to control unit power consumption taking current drawn below a specific limit. Starting from
the Current Limit Setpoint defined through the HMI or BAS communication, user can decrease the real limit using an
external 4-20mA signal as indicate in the graph below. With 20 mA real current limit is set to Current Limit Setpoint, whereas
with 4 mA signal the unit is unloaded until minimum capacity.
Capacity Limit
[%]
Minimum
Capacity
Maximum
Capacity
20
4
Demand Limit
[mA]
Current
Limit [A]
Flexible
Current Limit
[mA]
4
20
Current Limit
Setpoint
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Productinformatie
| Merk | Daikin |
| Model | EWYS5004Z |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 7564 MB |
