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General Information
Warning:
No ignition sources: No person carrying out work in relation to a REFRIGERATING SYSTEM which involves exposing any pipe work shall
use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, including
cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during which
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.
Ventilated Area: Ensure that the area is in the open or that it is adequately ventilated before accessing the refrigerant in 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.
During Repairs To Sealed Components: All power must be removed from the equipment being worked on prior to any removal of sealed
covers, etc. If it is absolutely necessary to have an electrical supply to equipment during servicing, then a permanently operating form
of leak detection shall be located at the most critical point to warn of a potentially hazardous situation.
Checks And Repairs 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, then 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 possibility of sparking;
•That no live electrical components and wiring are exposed while charging, recovering or purging the system;
•That there is continuity of earth bonding.
•
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 affected. This shall include damage to cables, excessive number of connections, terminals
not made to original specification, damage to seals, incorrect fitting of glands, etc.
•
Ensure that the apparatus is mounted securely.
•
Ensure that seals or sealing materials have not degraded to the point that they no longer serve the purpose of preventing the
ingress of flammable atmospheres. Replacement parts shall be in accordance with the manufacturer's specifications.
•
The following is a list of important considerations when working with R-32 equipment:
•
R-32 pressure is approximately 60% higher than R-22 pressure.
•
R-32 cylinders must not be allowed to exceed 125 F, they may leak or rupture.
•
R-32 must never be pressurized with a mixture of compressed air, it may become MORE flammable.
•
Servicing equipment and components must be specifically designed for use with R-32 and dedicated to prevent contamination.
•
Manifold sets must be equipped with gauges capable of reading 750 psig (high side) and 200 psig (low side), with a 500-psig low-
side retard.
•
Gauge hoses must have a minimum 750-psig service pressure rating.
•
Recovery cylinders must have a minimum service pressure rating of 400 psig, (DOT 4BA400 and DOT BW400 approved cylinders).
•
POE (Polyol-Ester) lubricants must be used with R-32 equipment.
•
To prevent moisture absorption and lubricant contamination, do not leave the refrigeration system open to the atmosphere for
extended periods of time.
•
If the system is void of refrigerant, weigh-in the refrigerant charge into the high side of the system.
•
If there is any amount of refrigerant in the system charge from the low side.
•
For low side pressure charging of R-32, use a charging adaptor.
NOTE: Sealed system repairs require the installation of a liquid line drier.
62
R-32 SEALED SYSTEM REPAIR
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