Rivacold RC Serie Instructions D'assemblage page 57

A1 group refrigerants are generally heavier than air and therefore tend to settle in the lower part of the room. Close to the floor and
close to static air it is possible to have an increase in concentration that can give rise to the following dangers:
Irritation of the respiratory tract with 30,000-50,000 ppm (from 3 to 5 Vol-%).
Fainting with 70,000-100,000 ppm (from 7 to 10 Vol-%) due to lack of oxygen.
CO2 is an irritant gas and causes agitation, dizziness, vomiting and cramps; at high concentrations it causes symptoms like
choking and severe pulmonary oedema.
To avoid damage to health, property and the environment, one must strictly comply with the following:
No unauthorized person shall have access to the equipment.
Ensure proper ventilation of the working environment, to prevent inhalation of high concentrations of vapour: MAK value 5000
ml/m3 (ppm) as a mean value 8h; as maximum limit is allowed a concentration of 10000 ppm (momentary value) 4 times per
round, with minimum stop intervals of 60min.
Make sure that the carbon dioxide coolant leaked from the unit does not enter the building (personal injury); CO2 refrigerant
vapours or gas must not reach into adjacent areas, in the staircases, courtyards, corridors or drain systems and must be rerouted
without danger.
Monitor the concentration of CO2 refrigerant in the air, to make sure it remains within the threshold limit values. Proper
ventilation will ensure compliance with the threshold limit values.
In case of emergency with high concentrations of CO2 refrigerant, it is mandatory to wear a breathing apparatus independent
from the air within the room.
Avoid leakage of coolant or oil: regularly check the tightness of the unit,
In the event of leaks on the evaporator (leakage of CO2), to ensure maximum safety of use you must operate the emergency stop
and secure the endangeredequipment.
Damage to the environment: CO2 should not be released into the atmosphere: negative influences on the environment (CO2,
with a rate of 50%, is the most important greenhouse gas originating in human activity)
9.3.3 Behaviour in emergency situations related to refrigerant R744
9.3.3.1 Behaviour in an emergency situation
DANGER :
In the event of unexpected large coolant leaks, immediately leave the area of installation and activate the emergency stop switch
of the machinery, located in a hazard-free area:

visible coolant leak (liquid or vapour) from the heat exchanger or the tubes;

sudden large leak (release and evaporation of most of the coolant in a very short period of time, e.g. less than 5 min);

sudden irritation of the respiratory tract

activation of the alarm system for CO2 (concentration > 5000 ppm - MAK value):
All necessary special protective measures must be applied by properly trained staff with the required protective clothing:

Use breathing protection.
 For repair work in environments with high concentrations of CO2 wear a breathing apparatus independent from the air
within the room.

Ensure good ventilation of the installation area.

Safely remove the coolant vapours and fluid.
9.3.3.2 Personal Protection Devices Required
NOTE:
Below are the PPE required to safely perform operations on models for refrigerant R744
Below are graphic symbols used in this manual to indicate the need to wear certain PPE.
Use respiratory protection!
The respiratory protective equipment must be suitable for the fluid used. The respiratory protective equipment must consist of:
• at least two independent protective equipment (separate devices)
refrigerant R744 can cause serious damage to health and the environment
For a complete understanding of the conventions and definitions used in these instructions, please refer to
the instructions in Section 1.2 – Conventions and Definitions in Chapter 1 – General information.
RC-RCS Pag - 57 - REV 02 03/16
UK