Maintenance; Routine Maintenance For R1234 - Daikin EWWD120J-SS Manuel D'installation, D'entretien Et D'utilisation

•
A remote switching (emergency type) for stopping
the refrigerating system shall be provided outside
the room (near the door). A similar acting switch
shall be located at a suitable location inside the
room.
•
All piping and ducting passing throught floors, ceiling
and walls of machinery room shall be sealed.
•
Hot surfaces shall not exceed a temperature of 80 %
of the auto-ignition temperature (in °C) or 100 K less
than the auto-ignition temperature of the refrigerant,
whichever is higher.
Refrigerant Auto ignition
temperature
R1234ze 368 °C
•
Machinery rooms shall have doors opening outward
and sufficient in number to ensure freedom for
persons to escape in an emergency; the doors shall
be tight fitting, self-closing and so designed that they
can be opened from inside (antipanic system).
•
Special machinery rooms where the refrigerant
charge is above the practical limit for the volume of
the room shall have a door that either opens directly
to the outside air or through a dedicated vestibule
equipped with self-closing, tight-fitting doors.
•
The ventilation of machinery rooms shall be
sufficient both for normal operating conditions and
emergencies.
•
Ventilation for normal operating conditions shall be in
accordance with national regulations.
•
The emergency mechanical ventilation system shall
be activated by a detector(s), located in the
machinery room.
o
This ventilation system shall be:
▪
independent of any other
ventilation system on the site.
▪
provided with two independent
emergency controls one located
outside the machinery room,
and the other inside.
o
The emergency exhaust ventilation fan
shall:
▪
Be either in the air flow with the
motor outside the airflow, or
rated for hazardous areas
(according to the assessment).
▪
Be located to avoid
pressurization of the exhaust
ductwork in the machinery
room.
▪
not cause sparks to occur if it
contacts the duct material.
o
Airflow of the emergency mechanical
ventilation shall be at least
where
V is the air flow rate in m3/s;
m is the mass of refrigerant charge, in
kg, in the refrigerating system with
the largest charge, any part of which
is located in the machinery room;
0,014 is a conversion factor.
o
Mechanical ventilation shall be operated
continuously or shall be switched on by
the detector.
•
Detector shall automatically activate an alarm, start
mechanical ventilation and stop the system when it
triggers.
•
The location of detectors shall be chosen in relation
to the refrigerant and they shall be located where the
refrigerant from the leak will concentrate.
•
The positioning of the detector shall be done with
due consideration of local airflow patterns,
accounting for location sources of ventilation and
Maximum surface
temperature
294 °C
louvers. Consideration shall also be given to the
possibility of mechanical damage or contamination.
•
At least one detector shall be installed in each
machinery room or the occupied space being
considered and/or at the lowest underground room
for refrigerants heavier than air and at the highest
point for refrigerants lighter than air.
•
Detectors shall be continuously monitored for
functioning. In the case of a detector failure, the
emergency sequence should be activated as if
refrigerant had been detected.
•
The pre-set value for the refrigerant detector at 30
°C or 0 °C, whichever is more critical, shall be set to
25 % of the LFL. The detector shall continue to
activate at higher concentrations.
Refrigerant LFL
3
R1234ze 0,303 kg/m
•
All electrical equipment (not only the refrigerating
system) shall be selected to be suitable for use in
the zones identified in the risk assessment. Electrical
equipment shall be deemed to comply with the
requirements if the electrical supply is isolated when
the refrigerant concentration reaches 25 % of the
lower flammable limit or less.
•
Machinery rooms or special machinery rooms shall
be clearly marked as such on the entrances to the
room, together with warning notices indicating that
unauthorized persons shall not enter and that
smoking, naked light or flames are prohibited. The
notices shall also state that, in the event of an
emergency, only authorized persons conversant with
emergency procedures shall decide whether to enter
the machinery room. Additionally, warning notices
shall be displayed prohibiting unauthorized operation
of the system
•
The owner / operator shall keep an updated logbook
of the refrigerating system.
The optional leak detector supplied by DAE with
the chiller should be used exclusively to check
refrigerant leakage from the chiller itself

9. Maintenance

Routine maintenance for R1234ze
9.1.
Personel working on the electrical or the refrigeration
components must be authorized, trained and fully qualified.
Maintenance and repair requiring the assistance of other
skilled personnel should be carried out under the supervision
of the person competent in the use of flammable refrigerants.
Any person conducting servicing or maintenance on a system
or associated parts of the equipment should be competent
according to EN 13313.
Persons working on refrigerating systems with flammable
refrigerants should have competence in safety aspects of
flammable refrigerant handling supported by evidence of
appropriate training.
electrical Never work on any electrical components, until the
components general supply to the unit has been cut using the
disconnect switch(es) in the control box. The
frequency variators used
capacitor batteries with a discharge time of 20
minutes; after disconnecting power wait 20 minutes
before opening the control box.
D-EIMWC01008-16_01EU - 10/171
Pre-set alarm
3
0,07575 kg/m 16500 ppm
are equipped with