Ewld J, Ewlh And Ewls Versions; Precautions When Handling Piping; Leak Test And Vacuum Drying; Charging The Unit - Daikin EWWD120J-SS Installations- Betriebs Und Wartungshandbuch

If compressors or compressor oils are to be
removed, it should be ensured that it has been
evacuated to an acceptable level to ensure that
there is no flammable refrigerant remaining within
the lubricant.
Only refrigerant recovery equipment designed
for use with flammable refrigerants should be
employed.
If the national rules or regulations permit the
refrigerant to be drained, this should be done
safely, using a hose, for example, through which
the refrigerant is discharged into the outside
atmosphere in a safe area. It should be ensured
that an inflammable explosive refrigerant
concentration cannot occur in the vicinity of an
ignition source or penetrate into a building under
any circumstance.
In the case of refrigerating systems with an
indirect system, the heat-transfer fluid should be
checked for the possible presence of refrigerant.
After any repair work, the safety devices, for
example refrigerant detectors and mechanical
ventilation systems, should be checked and the
results recorded.
It should be ensured that any missing or illegible
label on components of the refrigerant circuit is
replaced.
Sources of ignition should not be used when
searching for a refrigerant leak.
This chiller, whether with R134a, R513A or R1234ze,
must be maintained by qualified technicians. Before
beginning any work on the system, personnel shall
assure that all security precautions have been taken.
Always protect the operating personnel with personal
protective equipment appropriate for the tasks to be
performed. Common individual devices are: Helmet,
goggles, gloves, caps, safety shoes. Additional
individual and group protective equipment should be
adopted after an adequate analysis of the specific
risks in the area of relevance, according to the
activities to be performed.

10. EWLD J, EWLH AND EWLS VERSIONS

CONNECTING THE REFRIGERANT CIRCUIT
This product is factory charged with N
The units are equipped with a refrigerant inlet (discharge side)
and a refrigerant outlet (liquid side) for the connection to a
remote condenser. This circuit must be provided by a licensed
technician and must comply with all relevant European and
national regulations.

10.1. Precautions when handling piping

If air or dirt gets in the water circuit, problems may occur.
Therefore, always take into account the following when
connecting the water circuit:
1. Use clean pipes only.
2. Hold the pipe end downwards when removing
burrs.
3. Cover the pipe end when inserting it through a wall
so that no dust and dirt enter.
The discharge and liquid line must be welded directly to the
remote condenser piping. For use of the correct pipe diameter
see table of Technical specifications.
Make sure the pipes are filled with N
order to protect the pipes against soot.
There should be no blockage (stop valve, solenoid valve)
between the remote condenser and the provided liquid
injection of the compressor.

10.2. Leak test and vacuum drying

The units were checked for leaks by the manufacturer.
After connection of the piping, a leak test must be performed
and the air in the refrigerant piping must be evacuated to a
value of 4 mbars absolute by means of a vacuum pump.
Do not purge the air with refrigerants. Use a vacuum
pump to vacuum the installation.

10.3. Charging the unit

1. Perform an integral pre-start inspection like explained in
"BEFORE STARTING".
Carefully perform all required procedures like explained in
chapters from which is referred to in chapter "BEFORE
STARTING", but do not start the unit.
It is also necessary to read the operation manual delivered with
the unit. This will contribute to understand the operation of the
unit and its electronic controller.
Pre-charge of refrigerant without operation of the unit
Use the 1/4" SAE Flare stop valve on the filter drier to
2.
pre-charge the unit with the complete calculated pre-
charge.
Do not operate the compressor for pre-charging, this
to avoid compressor damage!
After completion of procedure step 2, perform an "initial
3.
start" test:
3.1. Start the compressor and wait for the compressor to
go through the star/delta.
Carefully check during start-up:
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during welding in
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