Specific R290 Gas Warnings; Indications For Vacuum And Charge With R290 Gas; R290 Gas Disposal; Safety Rules For R290 Units Transport And Storage - MAXA i-290 0106 Installer Manual

4.6 SPECIFIC R290 GAS WARNINGS
The R290 refrigerant gas:
• is odourless;
• is highly flammable (Class A3refrigerant), only if a inignition is present;
• it may cause an explosion, but only if a given concentration in air is reached.
It is good practice to follow these guidelines:
• do not smoke near the unit;
• affix a no smoking sign near the unit;
• do not inhale the gas;
• install the unit in outdoor area respecting the required technical spaces and danger zones indicated in this manual;
• do not drill or burn the unit;
• do not place the unit near sources of ignition, such as open flames, electric heaters, switches for lights, sockets, lamps or other permanent
ignition sources;
• any extraordinary maintenance or repair on the unit must be performed by technicians or qualified personnel, properly trained with specific
skills in handling flammable refrigerant gases, comply with local laws;
• after installation of the machine and before carrying out any maintenance work, ensure, by means of a leak detection test, that no concen-
tration of R290 gas can be measured in the danger zone.
4.7 INDICATIONS FOR VACUUM AND CHARGE WITH R290 GAS
Vacuum, charging and refrigerant gas recovery procedures may only be carried out by technicians or qualified personnel, who are adequately
trained in the handling of flammable gases and comply with local laws. Follow the requirements below:
• Ensure that other types of refrigerant do not contaminate the R290 (the minimum purity of the refrigerant gas used for charging operations
must be at least 99,5%);
• For refrigerant gas recovery, use cylinders with a left-hand connection and appropriate pitch. The maximum filling capacity must be 0,42
kg/L;
• Before charging the refrigerant gas, carry out three flushing cycles with pressurised nitrogen followed by a proper vacuum procedure;
• Keep the gas cylinder in a vertical position when filling;
• Apply the label on the appliance after loading;
• Wear work equipment suitable for operate with flammable gas (see Chapter 5.9 for more information). Always keep the work area well
ventilated and equip yourself with detection devices for R290;
• Do not charge more refrigerant gas than necessary. It should be noted that the performance of i-290 units is very sensitive to the amount of
gas loaded, so a charging error can lead to mulfunctions or even machine stoppages. It is recommended to charge the unit using calibrated
scales with a reading sensitivity of at least a tenth of a gram;
• Once loading is complete, perform leak detection operations prior to function test;
• Perform a second leak check, once all the previous operations have been completed.
ATTENTION: Each unit is equipped with two charging connections (high-pressure side and low-pressure side) to ensure
charging and discharging of the refrigerant circuit. The maximum tightening torque of the charging connections is 0.5 Nm.
ATTENTION: The unit is already charged with the regrigerant gas necessary for its correct operation. If it is necessary to
recharge it, after a maintenance operation or after a leak, follow the procedures described in Chapter 5.9.
ATTENTION: During the charging and recovery procedure of the unit, beware of possible refrigerant gas leaks that could start
a fire. Always carry out a risk assessment and apply the necessary preventive actions.
4.8 R290 GAS DISPOSAL
The procedures described below may only be performed by skilled technicians or qualified personnel, adequately trained and with specific skills
that comply with local laws:
• Do not discharge the gas in area where there is a risk of explosive mixtures forming with air. The gas should be disposed of in a suitable
torch with a flashback arrestor. Follow current regulations regarding the disposal of refrigerant gases. Contact the supplier if operating
instructions are considered necessary;
• Only use equipment approved for use with R290 refrigerant;
• When removing and disposing of the refrigerant, ensure that no air enters where the refrigerant is present (refrigerant circuit, cylinders or
other containers for transporting the refrigerant).
ATTENTION: During the refrigerant disposal procedure, beware of possible gas leaks that could start a fire.
4.9 SAFETY RULES FOR R290 UNITS TRANSPORT AND STORAGE
Before opening the unit's packaging, ensure there are no gas leaks in the environment with an appropriate gas detector. Check that there are
no ignition sources near the unit.
12
i-290
Inverter air/water heat pumps with axial fans