22
INStALLAtION
—
fix the leak
—
recreate the pneumatic vacuum
9
Take the necessary safety precautions for the system refri-
gerant.
9
It is forbidden to carry out welding operations with refrige-
rant inside the cooling circuit. If necessary, the refrigerant
must be recovered and the circuit must be cleaned with ni-
trogen without oxygen.
0
It is forbidden to use detergents containing chlorine becau-
se it could react with the refrigerant and corrode the copper
pipes.
If the pressure has not risen again:
—
remove the tube of the pressure gauge unit from the servi-
ce connection on the 3-way shut-off valve
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
1
2
3
4
5
A
B
—
fully open the unit shut-off valves
—
refit the valve covering plug
9
Carefully check for absence of leakages from the closing
point of the plug.
9
Do not force beyond the stop point to prevent damaging the
shaft and causing leakage as a consequence.
9
Once the check has been completed, remove any residues of
the water-soap solution.
9
Do not use the same vacuum pump with different refrige-
rants.
9
The vacuum pump requires regular maintenance and the
oil’s clarity must also be checked.
9
After having created the vacuum and established the electric
connections, proceed with the additional refrigerant charge
(see chapter "Additional refrigerant charge"
p. 27).
