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EN
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9
Evacuating
After the piping has been connected to the hydro unit, you can perform the
air purge together at once.
AIR PURGE
Evacuate the air in the connecting pipes and in the hydro unit using a
vacuum pump. Do not use the refrigerant in the outdoor unit. For details,
see the manual of the vacuum pump.
Be sure to use a vacuum pump with counter-
fl
ow prevention function so that
inside oil of the pump does not
fl
ow backward into pipes of the air to water
heat pump when the pump stops.
(If oil inside of the vacuum pump enters the air to water heat pump, which
use R410A, refrigeration cycle trouble may result.)
1. Connect the charge hose from the manifold valve to the service port of
the packed valve at gas side.
2. Connect the charge hose to the port of the vacuum pump.
3. Open fully the low pressure side handle of the gauge manifold valve.
4. Operate the vacuum pump to start evacuating. Then con
fi
rm that the
compound pressure gauge reading is –101 kPa (–76 cmHg).
5. Close the low pressure side valve handle of the gauge manifold valve.
6. Open fully the valve stem of the packed valves (both gas and liquid
sides).
7. Remove the charging hose from the service port.
8. Securely tighten the caps on the packed valves.
Using a vacuum pump
Packed valve at liquid side
Service port (Valve core (Setting pin))
Packed valve at gas side
Vacuum
pump
Vacuum pump adapter for
counter-
fl
ow prevention
(For R410A only)
Charge hose
(For R410A only)
Handle Hi
(Keep full closed)
Manifold valve
Pressure gauge
Compound pressure gauge
Handle Lo
Charge hose
(For R410A only)
Connecting pipe
–101 kPa
(–76 cmHg)
CAUTION
•
KEEP IMPORTANT 5 POINTS FOR PIPING WORK.
(1) Take away dust and moisture (inside of the connecting pipes).
(2) Tighten the connections (between pipes and unit).
(3) Evacuate the air in the connecting pipes using a VACUUM PUMP.
(4) Check gas leak (connected points).
(5) Be sure to fully open the packed valves before operation.
Packed valve handling precautions
• Open the valve stem all the way out, but do not try to open it beyond the
stopper.
• Securely tighten the valve cap with torque in the following table.
Pipe size of Packed Valve
Size of Hexagon wrench
12.70 mm and smallers
A = 4 mm
Cap
Cap Size (H)
Torque
Valve Rod Cap
H17 - H19
14~18 N·m
(1.4 to 1.8 kgf·m)
H22 - H30
33~42 N·m
(3.3 to 4.2 kgf·m)
Service Port Cap
H17
14~18 N·m
(1.4 to 1.8 kgf·m)
A
H
Hexagon wrench
is required.
Service Port Cap
Valve Rod Cap
01_1120551201-1 EN.indd 9
01_1120551201-1 EN.indd 9
5/18/2560 BE 3:12 PM
5/18/2560 BE 3:12 PM
