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• Wash the air filter by submerging it carefully in warm
water with a neutral detergent, rinse them off and let them
dry completely in a shady place.
• Install the filter carefully after having them cleaned and
completely dry.
• Make sure the filter cover is locked in.
ANOMALIES AND REPAIR
• If any anomaly is detected, check the following table:
Anomalies
Cause
E1
The temperature or
humidity sensor is
abnormal
E3
The PCB and
display connecting
is abnormal
The appliance contains flammable
refrigerant.
INSTRUCTIONS FOR REPAIRING
APPLIANCES CONTAINING R290
GENERAL INSTRUCTIONS
CHECKS TO THE AREA
• Prior to beginning work on systems containing flammable
refrigerants, safety checks are necessary to ensure
that the risk of ignition is minimised. For repair to the
refrigerating system, the following precautions shall be
complied with prior to con-ducting work on the system.
WORK PROCEDURE
• Work shall be undertaken under a controlled procedure
so as to minimise the risk of a flammable gas or vapour
being present while the work is being performed.
GENERAL WORK AREA
• All maintenance staff and others working in the local area
shall be instructed on the nature of work being carried
out. Work in confined spaces shall be avoided. The area
around the workspace shall be sectioned off. Ensure that
the conditions within the area have been made safe by
control of flammable material.
CHECKING FOR PRESENCE OF REFRIGERANT
• The area shall be checked with an appropriate refrigerant
detector prior to and during work, to ensure the technician
is aware of potentially flammable atmospheres. Ensure
that the leak tection equipment being used is suitable
for use with flammable refrigerants, i.e. nonsparking,
adequately sealed or intrinsically safe.
PRESENCE OF FIRE EXTINGUISHER
• If any hot work is to be conducted on the refrigeration
equipment or any associated parts, propriate fire
extinguishing equipment shall be available to hand. Have
a dry powder or CO 2 fire extinguisher adjacent to the
charging area.
NO IGNITION SOURCES
Solution
• No person carrying out work in relation to a refrigeration
Check
system which involves exposing any pipe work that
temperature or
contains or has contained flammable refrigerant shall
humidity sensor.
use any sources of ignition in such a manner that it
Reconnect and
may lead to the risk of fire or explosion. All possible
replace the PCB
ignition sources, including igarette smoking, should be
or Display.
kept sufficiently far away from the site of installation,
repairing, removing and disposal, during which flammable
refrigerant can possibly be released to the surrounding
space. Prior to work taking place, the area around the
equipment is to be surveyed to make sure that there are
no flammable hazards or ignition risks. "No Smoking"
signs shall be displayed.
VENTILATED AREA
• Ensure that the area is in the open or that it is adequately
ventilated before breaking into the system or conducting
any hot work. A degree of ventilation shall continue during
the period that the work is carried out. The ventilation
should safely disperse any released refrigerant and
preferably expel it externally into the atmosphere.
CHECKS TO THE REFRIGERATION EQUIPMENT
• Where electrical components are being changed, they
shall be fit for the purpose and to the correct specification.
At all times the manufacturer's maintenance and service
guidelines shall be followed. If in doubt consult the
manufacturer's technical department for assistance.The
following checks shall be applied to installations using
flammable refrigerants: the charge size 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 shall be checked for the presence of refrigerant;
marking to the equipment continues to be visible and
legible. Markings and signs that are illegible shall be
corrected; refrigeration pipe or components are installed
in a position where they are unlikely to be exposed to
any substance which may corrode refrigerant containing
components, unless the components are constructed of
materials which are inherently resistant to being corroded
or are suitably protected against being so corroded.
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