Daikin EWWS490VZXSA1 handleiding
Handleiding
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1.5.7 Evaporator Three Way Valve (Optional)
Evaporator Three Way valve is offered as an option but it is not mandatory to connect to the analog output terminals. This
output control can be enabled if a three way valve is connected to the evaporator. This option can be enabled in commission
unit menu.
1.5.8 Double setpoint
This contact can be used to switch between two different LWT setpoints and, depending on the application, between
different modes of operation.
Ice operation must be selected in case of ice storage application. In this case the UC will run the chiller in on/off mode,
switching all the chiller off as soon as the setpoint is reached. In this case the unit will run to full capacity and then will
switch off applying an ice delay different chiller starts.
1.5.9 Current limit (optional)
This optional feature enables a capacity control of the unit in order to limit the input current. The current limit feature is
included in the Energy Meter option. The limiting signal will be compared with a limiting value set on the HMI. By default
the current limit setpoint is selected through the HMI; an external 4-20 mA signal can be enabled to allow a remotely
changeable setpoint.
1.5.10 External Fault
This contact is available to report to the UC a fault or a warning from an external device. It could be an alarm coming from
an external pump to inform the UC of the fault. This input can be configured as a fault (unit stop) or a warning (displayed
on the HMI without any action on the chiller).
1.5.11 Rapid Restart (optional)
Purpose of the rapid restart feature is to let the unit restart in the shortest possible time after a power failure, and then
recover in the shortest possible time (maintaining the reliability level of the normal operations) the capacity it had before
the power failure. The rapid restart is enabled by the enable switch.
1.5.12 Remote On-Off
This unit can be started through a remote enable contact. The Q0 switch must be selected to “Remote”.
1.5.13 General Alarm
In case of a unit alarm, this output is closed thus indicating a fault condition to an externally connected BMS.
1.5.14 Compressor Status
The digital output is closed when the related circuit is in run state.
1.5.15 Circuit Alarm (optional)
This option is included with the “Rapid Restart” option. The related digital contact is closed in case of alarm on a circuit.
1.5.16 Evaporator Pump Start
A 24 Vdc digital output (with internal supply) is enabled when a pump (#1 or #2) is required to start. The output can be
used to start an external pump (either at fixed or variable speed). The output requires an external input or relay with less
than 20 mA excitation current.
1.5.17 Condenser Pump Start (W/C units only)
A digital output is enabled when a pump (#1 or #2) is required to start. A pump will be required to start when a compressor
will be called to start.
1.5.18 Demand limit
This optional function can be used to limit the unit capacity percentage to a changeable limit value. This limitation cannot
be directly linked to a corresponding limitation of the unit current (50% demand limit can differ from 50% of the unit FLA).
The demand limit signal can be changed continuously between 4 and 20 mA. The MicroTech™ will convert this signal into
a unit capacity limitation changing between minimum capacity and full capacity with a linear relationship. A signal between
0 and 4mA will correspond to a full unit capacity, in this way if nothing is connected to this input no limitation will be applied.
The maximum limitation will never force a unit shutdown.
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Productinformatie
| Merk | Daikin |
| Model | EWWS490VZXSA1 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 9055 MB |
