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• Screw completely using a fork wrench to keep the threaded part of the coupling stationary.
On the nut, use a torque wrench calibrated with the following values based on the dimensions of the
pipes to avoid deformations:
• Diameter 3/8'' 34 N.m < tightening torque < 42 N.m
• Diameter 5/8'' 68 N.m < tightening torque < 82 N.m
3.1.1 - Tests and checks
Once the connections are complete, check for perfect sealing of the refrigerant system.
To carry out the operations described below it is necessary to use a manometer unit specific for R32
and a vacuum pump with minimum flow rate of 40 l/min:
a.
Unscrew the caps of the service valves stems, both of the gas and of the liquid (fig. 13).
b. Connect the vacuum pump and manometer unit by means of the flexible pipes with 5/16" coupling
to the service connection of the gas line (fig.14).
c.
Switch on the pump and open the taps of the manometer unit.
d. Lower pressure up to -101kPa (-755mmHg, -1bar).
e.
Maintain underpressure for at least 1 hour.
f.
Close the taps of the manometer unit and switch off the pump.
g. After 5 minutes, only if pressure remained at -101kPa (-755mmHg, -1bar), pass to the operation at
step "h".
If pressure inside the circuit raised to a value higher than -101kPa (-755mmHg, - 1bar), it is neces-
sary to proceed with the search for the leak (by means of soap solution with refrigerant circuit under
nitrogen pressure ~ 30 bar).
Once the leak has been detected and repaired, it is necessary to restart from step "c".
h. Use a 4 mm hexagonal wrench to completely open the stem of the liquid valve.
i.
Use a 5 mm hexagonal wrench to completely open the stem of the gas valve.
l.
Remove the load flexible pipe connected to the service connection of the gas pipe.
m. Reposition the cap of the service connection of the gas pipe and fix it with a fork or normal wrench.
n. Reposition the caps of the service valves stems, both of the gas and liquid, then secure them.
Figure 13:
26. Valve stem
27. Valve stem cover
28. Loading hole
29. Main valve
3.1.2 - Loading of additional refrigerant
•
If the length of the pipes is higher than 15 m, top up the refrigerant as indicated in the table in paragraph
"REFRIGERANT CONNECTIONS".
•
Indicate the data of the external unit load (1), of the additional refrigerant quantity (2) and the total load
of the system (1+2) on the supplied label (fig.15).
Figure 16:
R1. Manometer unit
R2. Possible vacuum gauge
R3. Tap of the tank liquid
R4. Gas tank R32
3.2 - HYDRAULIC CONNECTIONS
• The choice and installation of the components is delegated, due to competence, to the
installer which will have to work according to good practice regulations and the Law in
force.
Figure 14:
30. Manometer unit
31. Possible vacuum
gauge
32. Vacuum pump
33. Tap of the flexible pipe
(open)
34. Service connection
(closed)
35. Gas pipe
36. Liquid pipe
37. External unit
R5. Service connection (closed)
R6. Gas pipe
R7. Liquid pipe
R8. External unit
SHERPA AQUADUE TOWER
EN - 17
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