Installation and Use

GB
50 /
VACUUM PUMP
SERVICE CONNECTION
GAS VALVE
SERVICE
CONNECTION
LIQUID
VALVE
COCK
PROTECTION
CAP
2.9 Creating a vacuum and checking the seal
ATTENTION:
- The operations detailed below should be carried out after the power sup-
ply to the air conditioning unit has been switched off .
- Use tools specifi c to R32 (pressure unit, charging pipe, vacuum pump). Us-
ing the same vacuum pump for various diff erent types of refrigerant could
damage the pump or the unit.
- Do not release refrigerant into the atmosphere. In the event of a refrigerant
leak, ventilate as much as possible.
- After having connected the pipes, check the joints for refrigerant leaks.
- Always protect the connection cables and pipes to prevent their being
damaged, as they could cause gas leaks when damaged (personal injury
from cold burns).
- In order to charge R32 into the system, the refrigerant must be in liquid
form.
A vacuum pump suitable for use with R32 must be used to bleed the circuit.
Make sure the vacuum pump is fi lled with oil to the level indicated by the oil
indicator light, and that the two cocks on the external unit are shut off :
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 external unit
three-way valve;
3. Fully open the low pressure valve, keeping the high pressure valve shut.
4. Create the vacuum for approximately 20/25 minutes;
5. Make sure the pressure gauge reads -0.101 MPa (-760 mmHg);
6. Close the low pressure valve and switch off the pump. Check that the nee-
dle on the pressure gauge does not move for approximately 5 minutes. If
the needle moves, this means that air is seeping into the system, and you
must check all connections are tight enough and that the piping connec-
tions were all performed correctly. Then repeat the procedure from step 3.
7. Disconnect the vacuum pump;
8. Open the cocks on the two-way and three-way valves fully;
9. Screw the plug tightly to the service outlet ensuring that it is well sealed,
10. After having tightened all the plugs, check that there are no gas leaks
around their circumference
ATTENTION:
Always protect the connection cables and pipes to prevent their being
damaged, as they could cause gas leaks when damaged (personal in-
jury from cold burns).