Introduction; General Description; Information On The Refrigerant Used - Daikin EWAT_B Series Installation, Maintenance And Operation Manual

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INTRODUCTION

This manual provides information on the standard functions and procedures of all units in the series and is an important
supporting document for qualified personnel, but can never replace it.
All units are delivered with wiring diagrams, certified drawings, nameplate; and DOC (Declaration Of Conformity);
these documents show all technical data for the unit you have bought. In case of any discrepancies between the contents
of the manual and the documentation provided with the unit, always rely on the unit because it is an integral part of this
manual.
Read this manual carefully before installing and starting up the unit.
Improper installation could result in electric shock, short-circuits, leaks, fire or other damage to the equipment or injure to
people.
The unit must be installed by professional operators / technicians in compliance with the laws in force in the country of
installation.
The start up of the unit must also be performed by authorized and trained personnel and all activities must be carried out
in compliance, in full compliance with local laws and regulations.
INSTALLATION AND START UP ARE ABOSOLUTELY FORBIDDEN IF ALL INSTRUCTIONS CONTAINED IN THIS
MANUAL ARE NOT CLEAR.
If you are unsure about assistance and for more information, contact an authorized representative of the manufacturer.

General description

The unit you bought is an "air cooled chiller", a machine aimed to cool water (or water-glycol mixture) within the limits
described in the following manual. The operation of the unit is based on compression, vapor condensation and subsequent
evaporation, according to the inverse Carnot cycle. The main components are:
- A scroll compressor to rise the refrigerant vapour pressure from evaporation pressure to condensation pressure;
- A condenser, where high pressure vapour condensate rejecting heat removed from the chilled water in the
atmosphere thanks to an air cooled heat exchanger;
- An expansion valve allowing to reduce the pressure of condensed liquid from condensation pressure to
evaporation pressure;
- An evaporator, where the low pressure liquid refrigerant evaporates to cool the water.
All units are fully assembled in the factory and tested before shipping. The EWAT_B range consists of models with a single
refrigerant circuit (from 76 to 350 kW) and models with a double refrigerant circuit (from 150 to 701 kW).
The machine uses R32 refrigerant fluid suitable for the entire field of application of the machine.
The controller is pre-wired, set up and tested at the factory. Only normal field connections such as piping, electrical
connections and pump interlocks are required, simplifying installation and increasing reliability. All safety and operation
control systems are installed at the factory in the control panel.
The instructions in this manual are applicable to all models in this series unless otherwise specified.

Information on the refrigerant used

This product contains R32 refrigerant that has a minimal environmental impact, thanks to its low value of Global Warming
Potential (GWP).
According to ISO 817, R32 refrigerant is classified as A2L, which is slightly flammable, since the flame propagation rate is
low, and non-toxic.
R32 refrigerant can burn slowly when all the following conditions are present:

The concentration is between the lower and upper flammability limit (LFL & UFL).

T Wind velocity<propagation of flame velocity

Energy of the ignition source>Minimum ignition energy
But pose no risk under the normal usage conditions for air-conditioning equipment and work environment.
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