2 | INSTALLATION
18
1
2-way shut-off valve
2
On-off valve cover plug
3
Hex wrench
A
Opening by 1/4 of a turn
- open the 2-way shut-off valve by a quarter of a turn
- close it after 6 seconds so as to allow a small quantity of
refrigerant into the circuit
- detect the leak using a solution of water and soap
- fix the leak
- recreate the pneumatic vacuum
Take the necessary safety precautions for the system refrigerant.
It is forbidden to carry out welding operations with refrigerant inside
the cooling circuit. If necessary, the refrigerant must be recovered
and the circuit must be cleaned with nitrogen without oxygen.
It is forbidden to use detergents containing chlorine because it could
react with the refrigerant and corrode the copper pipes.
If the pressure has not risen again:
A
Opening
B
Closing
1
Service connection blanking plug
2
On-off valve shaft
3
Refrigerating pipe attachment
4
On-off valve cover plug
5
Hex wrench
- remove the tube of the pressure gauge unit from the service
connection on the 3-way shut-off valve
- fully open the unit shut-off valves
- refit the valve covering plug
Carefully check for absence of leakages from the closing point of the
plug.
Do not force beyond the stop point to prevent damaging the shaft
and causing leakage as a consequence.
Once the check has been completed, remove any residues of the
water-soap solution.
Do not use the same vacuum pump with different refrigerants.
The vacuum pump requires regular maintenance and the oil’s clarity
must also be checked.
After having created the vacuum and established the electric
connections, proceed with the additional refrigerant charge (see
chapter "Additional refrigerant charge" p. 23
