Daikin EWAT290B-SRA1 [46/62] Water quality
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Daikin EWAT290B-SRA1 [46/62] Water quality

Daikin EWAT260B-SRB2 [46/62] Water quality
OPTIONS (TECHNICAL DATA)
46/62
Available fan static pressure correction factors
EXTERNAL STATIC PRESSURE [Pa]
0
10
20
30
COOLING CAPACITY CORRECTION FACTOR
1
0.998
0.995
0.990
COMPRESSOR POWER INPUTCORRECTION FACTOR
1
1.006
1.010
1.020
REDUCTION OF MAX OPERATING AMBIENT TEMPERATURE [°C]
1
-0.3
-0.5
-1
The above table is valid for SILVER and GOLD series with standard and VFD driven fans. Application with more
than 30 Pa of external static pressure are not recommended. In case where external static pressure over 30
Pa is required special high ESP fans are required.
Maximum cable dimension
Model
EWAT085B-XS(L)(R)A1
EWAT115B-XS(L)(R)A1
EWAT145B-XS(L)(R)A1
EWAT180B-XS(L)(R)A2
EWAT185B-XS(L)(R)A1
EWAT200B-XS(L)(R)A2
EWAT220B-XS(L)(R)A2
EWAT230B-XS(L)(R)A1
EWAT250B-XS(L)(R)A2
EWAT280B-XS(L)(R)A2
EWAT300B-XS(L)(R)A1
EWAT310B-XS(L)(R)A2
EWAT320B-XS(L)(R)A2
EWAT360B-XS(L)(R)A1
EWAT370B-XS(L)(R)A2
EWAT430B-XS(L)(R)A2
EWAT470B-XS(L)(R)A2
EWAT540B-XS(L)(R)A2
EWAT600B-XS(L)(R)A2
EWAT660B-XS(L)(R)A2
EWAT700B-XS(L)(R)A2
Heat recovery Units may be optionally equipped with heat recovery system. This system is made by a water
-cooled heat exchanger located on the compressors discharge pipe and a dedicated management of condensing
pressure.
To guarantee compressor operation within its envelope, units with heat recovery cannot operate with water
temperature of the heat recovery water lower than 25°C.
It is a responsibility of plant designer and chiller installer to guarantee the respect of this value (e.g. using
recirculating bypass valve).
Plant water content The cooled water distribution circuits should have minimum water content to avoid
excessive compressors start and stop. In fact, each time the compressor starts up, an excessive quantity of oil
goes from the compressor sump and simultaneously there is a rise in the temperature of the compressor motor’s
stator due to the inrush current during the start - up. To prevent damage to the compressors, have been
envisaged the application of a device to limit frequent stops and restarts.
During the span of one hour there will be no more than 10 starts of the compressor. The plant side should
therefore ensure that the overall water content allows a more constant functioning of the unit and consequently
greater environmental comfort.
The calculation of the water content should also consider the plant’s design parameters.
As a general indication the water content should not be less than 5 lt/kW on single circuit units and 2,5l/kW on
the twin circuit units.
Note: The indication is intended as a general guideline and not intended to substitute the evaluation made by
qualified technical personnel or by HVAC engineers. For more detailed analysis is better to consider the use of
other more detailed approach.
Water quality Before putting the unit into operation, clean the water circuit. Dirt, scales, corrosion debrits
and other material can accumulate inside the heat exchanger and reduce its heat exchanging capacity. Pressure
drop can increase as well, thus reducing water flow. Proper water treatment therefore reduces the risk of
corrosion, erosion, scaling, etc. The most appropriate water treatment must be determined locally, according to
the type of system and water characteristics. The manufacturer is not responsible for damage to or
malfunctioning of equipment caused by failure to treat water or by improperly treated water.

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