Refrigerant - Arneg Mini Booster Guía De Instalación Y Manejo

Mini Booster
CO
English
- Risk: Personal injuries and damage to the components of the refrigeration unit
- Action: Placing objects near the condenser fans with the risk of obstructing the air flow
- Risk: Increased condensing pressure beyond the maximum limits, with the intervention of the pressure
switch and consequent blocking of the refrigeration unit
- Action: Cleaning the condenser exchange surface while the machine is running
- Risk: Electrocution, burns, injuries
- Action: Maintenance interventions without wearing the appropriate PPE (shoes, gloves, etc.)
- Risk: Fractures, burns, abrasions, injuries, etc.
THE SAFETY VALVES ARE ON THE LIQUID RECEIVER (DUAL VALVE) ON THE NT DISCHARGE LINE AND ON THE
INTAKE LINES (LT AND NT).
THE NT COMPRESSOR INTAKE FEATURES A LOW PRESSURE SAFETY PRESSURE SWITCH, WHILE THE
DISCHARGE OF EACH LT AND NT COMPRESSOR FEATURES A HIGH PRESSURE SAFETY PRESSURE SWITCH:

DO NOT OPERATE IF THIS PRESSURE SWITCH IS NOT ADEQUATELY CONNECTED TO THE ELECTRICAL
CIRCUIT;

IF THE PRESSURE INCREASE IS DUE TO EXTERNAL FACTORS, CHECK THE EFFICACY OF THE SAFETY
PROTECTIONS.
N.B. All these operations must only be performed by specialist technical personnel.

9. Refrigerant

CO refrigeration units use R744 refrigerant (CO
2
See the Technical Data Manual for information on the amount of refrigerant contained in your refrigeration unit.
To determine the amount of CO
the condensing units must be added. It is advisable to display the data relating to the type and amount of CO
refrigeration unit outside the machine room to facilitate emergency interventions (see Safety Device paragraph).
N.B. Refer to the safety rules indicated in this Manual and to the technical data sheets of the refrigerant.
Some characteristics of CO
Chemical properties of CO

Colourless and odourless gas;

Inflammable;

Stable compound;

It can react vigorously with certain substances (e.g. ammonia)

Soluble in water, carbonic acid form which is corrosive towards some types of steel and other non-ferrous materials.
Physical properties:

At atmospheric conditions, carbon dioxide is gaseous and has a density that is 1.5 times greater than that of air
(present in the lower areas of the premises)

Critical point: 31 °C - 73.75 bar

Triple point: -56.58 °C - 5.18 bar
concentration
CO
2
vol % ppm v/v
0.028 280
0.0295 295
0.0368 368
1.5 15000
3.0 30000
3.0 – 5.0
from 30000 to 50000
8.0 – 10.0
from 80000 to 100000
If adequate ventilation is not guaranteed, as with other refrigerants, use suitable alarm detectors to be placed at floor level in
limited volumes affected by the refrigeration system. Periodically check the sensors, if installed, as indicated by the
manufacturer.
20
Transcritical Rack
2
) with a 99.9% purity.
2
contained in the system, the amounts relating to the distribution network to the users and to
2
are indicated below. For further information see the safety data sheet attached to the manual.
2
:
2
atmospheric concentration in the XIX century
atmospheric concentration in the early XX century
atmospheric concentration in the year 2000
value detectable by the most sensitive alarm detectors
average value detected by alarm sensors
possible headaches, difficulty in breathing, nausea in exposed subjects
cramps, loss of consciousness, respiratory blockage and possibly even
death
contained in the
2
Note
05060197 00 09/2020