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2.10 Refrigerant recovery
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. close the two-way valve
5. when the pressure gauge reads “0”, close the three-way valve and turn the air
conditioning off immediately.
6. shut the caps on the valves
MODEL
2,5 kW 3,5 kW 5 kW 7 kW
Liquid pipe diameter
1/4" 1/4" 1/4" 3/8"
Gas pipe diameter
3/8" 3/8" 1/2" 5/8"
Maximum length of pipe with standard charge
5 m 5 m 5 m 5 m
Maximum distance between internal and external unit*
20 m 20 m 25 m 25 m
Standard charge
0,73 kg 0,8 kg 1,25 kg 2,25 kg
Extra gas recharge
20 g/m 20 g/m 20 g/m 40 g/m
Maximum difference in height between internal and external unit**
8 m 8 m 10 m 10 m
Type of refrigerant
R410A R410A R410A R410A
(*) at the maximum distance, the effi ciency is approximately 90%.
(**) with a difference in height of more than 3 m, we recommend you include a trap as illustrated in the
gure.
2.11 Charging the refrigerant gas
Before proceeding with the refrigerant charging operations, check that all the valves
and cocks are shut.
N.B.: the fi rst time you install the appliance, perform the procedure described in
paragraph 2.9 “Making a vacuum and checking the tightness”.
1. Connect the service valve to the low pressure connection of the pressure gauge,
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 act on 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 on cooling mode. Leave it on for a few minutes;
4. Place the refrigerant cylinder above the electronic scale and record the weight;
5. Control the pressure shown on the pressure gauge;
6. Open the “LOW” knob and allow the refrigerant to fl ow gradually;
7. When the refrigerant recharge introduced into the circuit reaches the set value
(provided by the difference in weight of the cylinder), close the “LOW” knob;
8. When the charging is complete, test the operation, measuring the temperature of
the gas pipe with the special thermometer: the temperature should be between
5°C and 8°C more than the temperature read on the evaporation temperature
section of the pressure gauge. Now check the stability of the pressure, 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 there are
no refrigerant leaks using the leak detector. (If there are any leaks, carry out the
procedure described in paragraph 2.10 “refrigerant recovery”);
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 disperse R410A in
the atmosphere: R410A
is a greenhouse fl uori-
nated gas, covered by the
Kyoto Protocol, with a
GWP(*)=1975.
(*) GWP,
stands for «Global Warming Po-
tential».
WARNING:
Recharge any refrigerant gas in accordance with the instructions provided on the product used, wearing protective
clothing, avoiding violent outlets of gas from the tank or from the system’s connections.
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