Daikin EWWD VZ Series, Installation, Maintenance And Operating Manual

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Operation
Operator’s responsibilities
It is important that the operator becomes familiar with the equipment before operating the machine. In addition to
reading this manual, the operator should study the operation manual and the wiring diagram supplied with the
unit to understand commissioning, operation and the shutdown sequence as well as the shutdown mode and
safeties.
During initial machine start-up, the Daikin technician is available to answer any questions and instruct on proper
operating procedures.
The operator should keep an operating data log for each specific machine. Furthermore, an additional
maintenance log should be kept for periodic maintenance and service.
This Daikin unit represents a substantial investment and deserves the attention and care to keep this equipment
in good working order. If the operator observes abnormal or unusual operating conditions, calling Daikin
technical service is recommended.
In any case, it is essential to follow the instructions below during operation and maintenance:
- Do not allow unauthorized and/or unskilled personnel to access the unit.
- It is forbidden to access the electrical components without having opened the unit main switch and switched off
the power supply.
- It is forbidden to access the electrical components without using an insulating platform. Do not access electrical
components if water and/or moisture are present.
- Ensure that all operations on the refrigerant circuit and on components under pressure are exclusively carried
out by qualified personnel.
- Compressors must be replaced and lubricant oil filled by qualified personnel.
- Sharp edges can cause injuries. Avoid direct contact.
- Do not introduce solid objects into the water pipes while the unit is connected to the system.
- A mechanical filter must be fitted to the water pipe connected to the heat exchanger inlet.
- The unit is equipped with high-pressure safety pressure switches on each compressor, which stop it when
triggered when the pressure exceeds the set value. If triggered, reset the pressure switches by pressing the blue
button and then the alarm on the microprocessor.
- It is absolutely forbidden to remove any protection system covering moving parts.
In case of sudden stop of the unit, follow the instructions on the Control Panel Operating Manual which is part of
the on-board documentation delivered to the end user.
It is strongly recommended to perform installation and maintenance with other people.
In case of accidental injury or unease, it is necessary to:
- Keep calm.
- Press the alarm button if present in the installation site.
- Move the injured person to a warm place far from the unit and in place him or her in the recovery
position.
- Immediately contact any emergency personnel in the building or the call the Emergency Services.
- Wait until emergency personnel arrive and do not leave the injured person alone.
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Unit description
The machine is made up of a latest generation, high efficiency, new VVR series single screw compressor,
flooded shell and tube evaporator with the refrigerant outside the tubes and the water to be cooled flowing inside
the tube.
A shell and tube condenser where the refrigerant condenses outside the tubes while the cooling water flows
inside of the high-efficiency tubes.
The compressor is of the mono screw semi-hermetic type and utilizes the suction gas coming from the
evaporator to cool the motor and permit the optimum operations in all machine load conditions. The compressor,
controlled by inverters, changes its cooling load according to the rotational speed decided by the controller. In
this way the machine perfectly adapts to system operating conditions to maximize performance.
The oil injection lubrication system, in addition to allowing normal moving part lubrication, also seals the screw
ensuring gas compression, without the aid of an external oil pump.