8
Trouble Possible Causes Suggested Remedies
5. E2 Code Water tank full when cooling. Take o the rubber stopper and empty the water.
INSTRUCTIONS FOR REPAIRING APPLIANCES CONTAINING R290
Note! These instructions are meant only for the authorized service technician when maintaining the appliance. Servicing shall only be
performed as recommended by the equipment manufacturer. Maintenance and repairs shall only be carried out by a person competent
in the use of ammable refrigerants. Contact an authorized service technician for the repair or maintenance of this unit.
1 GENERAL INSTRUCTIONS
1.1 Checks to the area
Prior to beginning work on systems containing ammable refrigerants, safety checks are necessary to ensure that the risk of ignition is mini-
mized. When repairing the refrigerating system, the following precautions shall be complied with prior to conducting work on the system.
1.2 Work procedure
Work shall be undertaken under a controlled procedure so as to minimize the risk of a ammable gas or vapor being present while the work is
being performed.
1.3 General work area
All maintenance sta and others working in the local area shall be instructed on the nature of the work being carried out. Work in conned spac-
es shall be avoided. The area around the workspace shall be sectioned o. Ensure that the conditions within the area have been made safe by
controlling the ammable material.
1.4 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
ammable atmospheres. Ensure that the leak detection equipment being used is suitable for use with ammable refrigerants, i.e., nonsparking,
adequately sealed or intrinsically safe.
1.5 Presence of re extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate re extinguishing equipment shall be
available on hand. Have a dry powder or CO2 re extinguisher adjacent to the charging area.
1.6 No ignition sources
No person carrying out work in relation to a refrigeration system involving exposing any pipe work that contains or has contained ammable re-
frigerant shall use any sources of ignition in such a manner that it may lead to the risk of re or explosion. All possible ignition sources, including
cigarette smoking, should be kept suciently far away from the site of installation, repairing, removing and disposal, during which ammable
refrigerant can possibly be released to the surrounding space. Prior to the work taking place, the area around the equipment is to be surveyed to
make sure that there are no ammable hazards or ignition risks.“No Smoking”signs shall be
displayed.
1.7 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 pref-
erably expel it externally into the atmosphere.
1.8 Checks to the refrigeration equipment
Where electrical components are being changed, they shall be t for the purpose and to the correct specication. 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 ammable refrigerants: the charge size is in accordance with the room size, within which the refrig-
erant containing parts are installed; the ventilation machinery and outlets are operating adequately and are not obstructed; if an indirect refrig-
erating 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; the refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any sub-
stance which may corrode refrigerant containing components, unless the components are constructed of materials which are inherently resist-
ant to being corroded or are suitably protected against being so corroded.
1.9 Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. If a fault exists that
could compromise safety, no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected
immediately but it is necessary to continue operation, an adequate temporary solution shall be used. This shall be reported to the owner of the
equipment so all parties are advised.
Initial safety checks shall include: that capacitors are discharged – this shall be done in a safe manner to avoid the possibility of sparking; that no
live electrical components or wiring are exposed while charging, recovering or purging the system; that there is continuity of earth bonding.
2 REPAIRS TO SEALED COMPONENTS
2.1 During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon prior to
any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply for equipment during servicing, then a per-
manently operating form of leak detection shall be located at the most critical point to warn of a potentially hazardous situation.
2.2 Particular attention shall be paid to the following to ensure that, by working on electrical
components, the casing is not altered in such a way that the level of protection is aected.
This shall include damage to cables, excessive number of connections, terminals not
made to original specication, damage to seals, incorrect tting of glands, etc. Ensure that the apparatus is mounted securely. Ensure that seals
or sealing materials have not degraded to such an extent that they no longer serve the purpose of preventing the ingress of ammable atmos-
pheres. Replacement parts shall be in accordance with the manufacturer’s specications.
NOTE The use of silicon sealant may inhibit the eectiveness of some types of leak detection
equipment. Intrinsically safe components do not have to be isolated prior to working on them.
3 REPAIRS TO INTRINSICALLY SAFE COMPONENTS
Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and
