Manuale Installatore - Elco Ecoflam

TIGHTENING TORQUE FOR THE FLANGE CONNECTIONS
Pipe Tightening torque Corresponding effort
[Kg / cm]
(using a 20 cm spanner)
6,35 mm ( 1 / 4” ) 140-180 wrist force
9,52 mm ( 3 / 8” ) 330-420 arm force
12,70 mm ( 1 / 2” ) 500-620 arm force
15.88 mm ( 5 / 8” ) 630-770 arm force
TIGHTENING TORQUE FOR PROTECTION CAPS
Tightening torque (Kg / cm)
Service connection 70 - 90
Protection caps 250 - 300
Length of the piping
The maximum length of the connection piping is 10 m . When the piping is
longer than 5 m, pay attention to the quantity of refrigerant that should be
added per metre.
Should the external unit have to be installed higher up than the internal unit
with a difference in height of more than 3 m, then traps should be fitted on the
return piping so that the oil trickling down the pipe walls deposits in the trap
until the latter is full. The oil plug that forms will be shot upwards by the gas.
2.9 Making a vacuum and checking the tightness
The air must be expelled from the circuit using a vacuum pump, pump transition
fitting and pressure gauge assembly which are suitable for R410A.
Ensure that the vacuum pump is filled with oil to the level indicated by the oil
gauge.
Link the vacuum pump to the service connection, after ensuring that both
cocks on the external unit are shut.
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 three-way valve
of the external unit and to the vacuum pump transition fitting,
3. once you have opened the corresponding valves on the pump, start the latter
and leave it to operate, Make a vacuum for approximately 20/25 minutes,
4. check that the needle on the left-hand pressure gauge has moved towards
-76 cm Hg (vacuum of 4 mm Hg or less),
5. shut the cocks on the pump and turn it off. Check that the needle 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
that all connections are tight enough and that the pipe connections were all
made correctly; then repeat the procedure from step 3,
6. disconnect the vacuum pump,
7. open the cocks on the two-way and three-way valves fully,
8. screw the plug tightly to the service outlet ensuring that it is well sealed,
9. after having tightened all the plugs, check that there are no gas leaks
around their circumference.
WARNING
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)
vacuum
pump
cock
8 m max
service connection
internal unit
gas valve
protection
caps
service
connection
liquid valve
cock
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