Installation and Use

2.10 Recovering the refrigerant

Procedure for returning all the refrigerant to the external unit:

1. unscrew the caps from the cocks on the two-way and three-way valves.

2. set the appliance to cooling mode (check whether the compressor works) and leave the appliance on for a few

minutes.

3. connect the pressure gauge.

4. shut oﬀ the two-way valve.

5. when the pressure gauge reads “0”, shut oﬀ the three-way valve and turn the air conditioning unit oﬀ immediately.

6. shut the caps on the valves.

WARNING:

Recharge refrigerant gas as necessary in accordance with the instructions provided for the product used, wearing

protective clothing, avoiding sharp bursts of gas from the tank or from the system connections.

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 diﬀ erence 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* = 2088.

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

Note

PENTA 121 XC8B-O

MASTER LIQUID VALVE

1/4” - 3/8”

MASTER GAS VALVE

1/4” - 1/2”