Evacuating - Toshiba RAS-10 Installation Manual

vac atin
After the piping has been connected to the indoor unit, you can perform the
air purge together at once.
AI PU
Evacuate the air in the connecting pipes and in the indoor unit using a
vacuum pump. Do not use the refrigerant in the outdoor unit. For details,
see the manual of the vacuum pump.
Usin a vac m m
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 conditioner
when the pump stops.
(If oil inside of the vacuum pump enters the air conditioner, which use R32,
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. Perform evacuating for
about 15 minutes if the piping length is 20 meters. (15 minutes for 20 meters)
(assuming a pump capacity of 27 liters per minute) Then confi 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.
Compound pressure gauge
–101 kPa
(–76 cmHg)
Handle Lo
Charge hose
Connecting pipe
Packed valve at gas side
Service port (Valve core (Setting pin))
Packed valve at liquid side
CAU I N
•
P I P AN P IN F
(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.
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
Vacuum pump adapter for
counter-fl ow prevention
Vacuum
pump
PIPIN .
7
Pac ed valve handlin
• Open the valve stem all the way out, but do not try to open it beyond the
stopper.
Pi e si e o Pac ed alve
12.70 mm and smallers
15.88 mm
• Securely tighten the valve cap with torque in the following table:
Ca Ca i e
H17 - H19
Valve Rod Cap
H22 - H30
H14
Service Port Cap
H17
Hexagon wrench
is required.
Service Port Cap
Valve Rod Cap
reca tions
i e o e a on rench
A = 4 mm
A = 5 mm
EN
or e
14~18 N·m
(1.4 to 1.8 kgf·m)
33~42 N·m
(3.3 to 4.2 kgf·m)
8~12 N·m
(0.8 to 1.2 kgf·m)
14~18 N·m
(1.4 to 1.8 kgf·m)
A
H