Bedienungsanleitung Ariston EVOS 35 MC4 (Seite 24 von 88) (Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch)

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VACUUM PUMP

SERVICE CONNECTION

GAS VALVE

SERVICE

CONNEC-

TION

LIQUID

VALVE

COCK

PROTECTION

CAPS

3 m

TIGHTENING TORQUE FOR THE FLANGE CONNECTIONS

Pipe Tightening torque

[kgf x cm]

Corresponding effort

(using a 20 cm spanner)

6.35 mm (1/4”) 160 - 200 wrist force

9.52 mm (3/8”) 300 - 350 arm force

12.70 mm (1/2”) 500 - 550 arm force

15.88 mm (5/8”) 630 - 770 arm force

TIGHTENING TORQUE FOR PROTECTION CAPS

Tightening torque [kgf x cm]

Service connection 70-90

Protection caps 250-300

IMPORTANT CHECK FOR ANY REFRIGERANT LEAKS

Once you have made the connections, open the cocks so that the gas ﬁ lls

the piping and always check all piping against leaks using a leak detector

(risk of personal injury from cold burns).

LENGTH OF THE PIPING

The maximum length of the connection piping varies according to the mod-

el. When the piping is longer than 5 m, pay attention to the quantity of re-

frigerant that should be added for each metre. Should the external unit

have to be installed higher up than the internal unit with a difference in

height of more than 3 m, then traps should be ﬁ tted on the return piping so

that the oil trickling down the pipe walls deposits in the trap until the latter

is full. The oil plug that forms will be shot upwards by the gas.

2.9 Making a vacuum and checking the tightness

The air must be expelled from the circuit using a vacuum pump, pump tran-

sition ﬁ tting and pressure gauge assembly which are suitable for R410A.

Ensure that the vacuum pump is ﬁ lled with oil to the level indicated by the

oil gauge and that both cocks on the external unit are shut:

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

on the service valve;

2. connect the vacuum pump to the small service valve in the three-way

valve of the external unit;

3. once you have opened the corresponding valves on the pump, start the

latter and leave it to operate. Make a vacuum for approximately 20/25

minutes;

4. make sure the pressure gauge shows -0.101 MPa (-760 mmHg);

5. shut the cocks on the pump and turn it off. Check that the needle on the

pressure gauge does not move for approximately 5 minutes. If the nee-

dle moves, this means that air is seeping into the system, and you must

check all connections are tight enough and that the piping connections

were all made correctly; then repeat the procedure from step 3;

6. disconnect the vacuum pump;

7. open the cocks on the two-way and three-way valves fully;

8. screw the plug tightly to the service outlet ensuring that it is well sealed;

9. after having tightened all the plugs, check that there are no gas leaks

around their circumference.

WARNING:

Always protect the connection cables and pipes to prevent damage to

them, as they could cause gas leaks when damaged (personal injury

from cold burns).

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