Installation and Use

2.11 Charging the refrigerant gas

Before proceeding with the refrigerant charging operations, check that all the valves and cocks are shut.

N.B.: during initial installation, perform the procedure described in paragraph 2.9 “Creating a vacuum and checking

the seal”.

1. Connect the low pressure connection of the pressure gauge to the service valve, and connect the refrigerant tank

to the central inlet of the pressure gauge. Open the refrigerant tank and then open the cap on the central valve and

work the pin valve until you hear the refrigerant exiting, then release the pin and screw the cap back on;

2. Open the three-way valve and the two-way valve;

3. Turn on the air conditioning unit in cooling mode. Leave it running for a few minutes;

4. Place the refrigerant canister on the electronic scales and record its weight;

5. Check the pressure shown on the pressure gauge;

6. Open the “LOW” knob and allow the refrigerant to ﬂ ow gradually;

7. When the refrigerant charge in the circuit reaches the speciﬁ ed value (calculated by means of the difference in

weight of the canister), shut off the "LOW" knob;

8. When charging is complete, test operation by measuring the temperature of the gas pipe with the special ther-

mometer: the temperature should be 5 to 8°C over the temperature read on the evaporation temperature section

of the pressure gauge. Now check the stability of the pressure, by connecting the pressure gauge assembly to the

three-way service valve. Open the two-way and three-way valves fully, turn on the air conditioning unit and check

for refrigerant leaks using the leak detector (if there are any leaks, carry out the procedure described in paragraph

2.10 “Recovering the refrigerant”);

8. Disconnect the pressure gauge from the valve and turn the air conditioning unit off;

9. Disconnect the tank from the pressure gauge and close all caps.

WARNING:

Do not release R410A into the atmosphere.

R410A is a ﬂ uorinated greenhouse gas, covered by the Kyoto Protocol, with a GWP* = 1975.

(*) GWP is an acronym of "Global Warming Potential", referring to the greenhouse effect.