Tesla TT34EXC1-1232IA - Инструкция по эксплуатации - Страница 61

61

ENG

16.   

Information on servicing

: 

1.  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 minimized. For repair to the refrigerating system, the following precautions shall be 
complied with prior to conducting work on the system. 
2. Work procedure  
Work shall be undertaken under a controlled procedure so as to minimize the risk of a flammable gas or 
vapour being present while the work is being performed. 
3. 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. 
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 flammable atmospheres. Ensure that the leak detection equipment being 
used is suitable for use with flammable refrigerants, i.e. non-sparking, adequately sealed or intrinsically safe 
5. Presence of fire extinguisher 
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire 
extinguishing equipment shall be available to hand. Have a dry powder or CO2 fire extinguisher adjacent to 
the charging area. 
6. No ignition sources 
No person carrying out work in relation to a refrigeration 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. “No Smoking” signs shall be displayed. 
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 preferably expel it externally into the 
atmosphere. 
8. 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. 
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, 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 there no live electrical components and wiring are exposed while charging, recovering or purging the 
system; 
-That there is continuity of earth bonding.

17.   

Repairs to sealed components

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