Riello 20153499, Installation And Technical Service Instructions

Page: 26 / 44

26
INStAllAtION
Having verified the absence of leakages:
— create a pneumatic vacuum inside the circuit
—
Pneumatic vacuum
to create vacuum in the circuit:
— keep the outdoor unit shut-off valves closed
A High pressure
B Low pressure
1 Pressure gauge unit
2 Vacuum pump
3 3-way valve service connection
A B
1
2
3
— connect the vacuum pump to the pressure gauge unit
— connect the pressure gauge unit to the service connection
on the 3-way shut-off valve
— completely close the pressure reducing valve of the pres-
sure gauge
—
fully open the low pressure valve of the pressure gauge unit
— let the vacuum pump work for at least 15 minutes
— reach a pressure that is close to -0.1 Mpa
— close the low pressure valve of the pressure gauge unit
— switch off the vacuum pump
— wait 5 minutes
— check that the pressure has not risen again
If the pressure has risen again:
1 2-way shut-off valve
2 On-off valve cover plug
3 Hex wrench
A Opening by 1/4 of a turn
A
3
1
2
— 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
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