25
INStAllAtION
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
If required:
—
remove the valve covering plug
—
operate on the valve shaft with an hex wrench
—
open or close according to what is needed
—
immediately stop as soon as the valve shaft has reached
the stop point
—
use a torque wrench calibrated on the valve diameter
Pipe Ø
Hex
wrench
Valve
tightening
torque
Plug
tightening
torque
mm
inches
mm
Nm
Nm
6,35
1/4
5
6
25
9,52
3/8
5
6
25
12,70
1/2
5
8
30
15,88
5/8
5
10
35
9
Do not force beyond the stop point to prevent damaging the
shaft and causing leakage as a consequence.
At the end of the operations:
—
refit the valve covering plug
9
Carefully check for absence of leakages from the closing
point of the plug.
9
Circuit tightness check
The appliance is tested at the factory and the indoor refrigera-
ting circuit tightness does not usually need to be checked.
The refrigerating circuit built on site needs to be checked inste-
ad.
to check tightness:
—
keep the outdoor unit shut-off valves closed
A
High pressure
B
Low pressure
1
Pressure regulator
2
Nitrogen cylinder
3
Pressure gauge unit
4
3-way valve service connection
N2
A
B
1
2
3
4
1
3-way valve service connection
1
—
charge the circuit with nitrogen through the service con-
nection on the 3-way shut-off valve
0
Do not use oxygen or acetylene or other flammable or poi-
sonous gases in the refrigerating circuit, as they can cause
explosions.
—
reach a pressure equal to 0.3 Mpa
—
wait 3 minutes.
—
check that the pressure has not dropped
—
reach a pressure equal to 1.5 Mpa
—
wait 3 minutes.
—
check that the pressure has not dropped
—
reach a pressure equal to 3 Mpa
—
adjust the reached pressure and room temperature
—
leave the circuit pressurised for 1 day
—
check that the pressure has not dropped
9
If the temperature has changed with respect to the noted
value consider that the pressure varied by 0.01 Mpa for 1 °C.
9
If pressure has dropped, detect the leak, fix it and repeat
the test.
9
To detect the leak, use a solution of water and soap and
check all the joints and welds, if any.
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