RT-SVX096A-EN
41
Important Service Precautions
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical
hazards, MUST follow precautions in this manual and
on the tags, stickers, and labels, as well as the
following instructions: Unless specified otherwise,
disconnect all electrical power including remote
disconnect and discharge all energy storing devices
such as capacitors before servicing. Follow proper
lockout/tagout procedures to ensure the power can
not be inadvertently energized. When necessary to
work with live electrical components, have a qualified
licensed electrician or other individual who has been
trained in handling live electrical components perform
these tasks.
While changing electrical components, they must fit
according to their purpose and to the correct specification.
Refer to manufacturer’s maintenance and service
guidelines or consult the manufacturer’s technical
department for assistance.
The following checks must be applied during installations
using flammable refrigerants:
• The actual refrigerant charge is in accordance with the
room size within which the refrigerant containing parts
are installed.
• The ventilation machinery and outlets are operating
adequately and are not obstructed.
• If an indirect refrigerating circuit is being used, the
secondary circuit must be checked for the presence of
refrigerant.
• Equipment marking must remain visible and legible.
Illegible markings and signs must be corrected.
Refrigerating pipe or components are installed in a way that
they are not exposed to any substances which may
corrode refrigerant containing components, unless the
components are constructed of materials that are
inherently resistant to corrosion or are suitably protected
against corrosion.
Repair and maintenance of electrical components must
include initial safety checks and component inspection
procedures. If there is a fault causing issue, do not connect
any electrical supply to the circuit until the fault is corrected.
If the fault cannot be corrected immediately but it is
necessary to continue operation, an adequate temporary
solution must be used. This must be reported to the
equipment owner so that all parties are advised.
Following initial safety checks must be included:
• Capacitors must be discharged in a safe manner to
avoid the possibility of sparking.
• No live electrical components and wiring must be
exposed while charging, recovering, or purging the
system.
• There must be continuity of earthing.
Sealed electrical components and Intrinsically safe
components must be replaced.
Cabling must not subject to wear, corrosion, excessive
pressure, vibration, sharp edges, continual vibration from
sources such as compressors or fans, or any other adverse
environmental effects.
Potential sources of ignition (A halide torch or any other
detector using a naked flame) must not be used while
detecting/searching refrigerant leaks.
Electronic leak detectors may be used to detect refrigerant
leaks but, in the case of flammable refrigerants, the
sensitivity may not be adequate, or may need re-
calibration. (Detection equipment must be calibrated in a
refrigerant-free area.) Verify that the detector is not a
potential source of ignition and is suitable for the refrigerant
used. Leak detection equipment must be set at a
percentage of the LFL of the refrigerant and calibrated for
the refrigerant employed, and the appropriate percentage
of gas (25% maximum) must be confirmed.
If a leak is suspected, all naked flames must be removed/
extinguished. If a refrigerant leak which requires brazing is
found, all the refrigerant must be recovered from the
system, or isolated(by means of shut off valves) in a part of
the system remote from the leak.
Leak detection fluids can be used with most refrigerants but
avoid using detergents containing chlorine as the chlorine
may react with the refrigerant and corrode the copper pipe-
work. Examples of leak detection fluids are bubble method
and fluorescent method agents.
When breaking into the refrigerant circuit to make repairs—
or for any other purpose—use conventional procedures.
For flammable refrigerants follow best practices. Adhere to
the following steps:
1. Remove refrigerant safely following local and national
regulations.
2. Evacuate.
3. Purge the circuit with inert gas.
4. Evacuate.
5. Continuously flush or purge with inert gas when using
flame to open circuit.
6. Open the circuit.
Recover the refrigerant charge into the correct recovery
cylinders if venting is not allowed by local and national
codes. For appliances containing flammable refrigerants,
purge the system with oxygen-free nitrogen to render the
appliance safe for flammable refrigerants. If needed, repeat
the process several times.
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