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Toshiba RAS-07YA-ES RAS-10YK-ES Manual

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– 30 –
8-5-1. Refrigerant Piping Connection
<Flaring>
(1) Cut the pipe with a pipe cutter.
90˚
Obliquity
Roughness
Warp
Fig. 8-5-2
(2) Insert a flare nut into the pipe, and flare the pipe.
Outer
dia.
6,35mm
9,52mm
A (mm) R22/R410A
Imperial Rigid
1,0 ~ 1,5/ 0,5 ~ 1,0/
1,5 ~ 2,0 1,0 ~ 1,5
1,0 ~ 1,5/ 0,5 ~ 1,0/
1,5 ~ 2,0 1,0 ~ 1,5
Die Pipe
A
Fig. 8-5-3
Fig. 8-5-4
<Tightening connection>
Align the centers of the connecting pipes and tighten
the flare nut as far as possible with your fingers.
Then tighten the nut with a spanner and torque
wrench as shown in the figure.
CAUTION
• Do not apply excess torque. Otherwise, the
nut may crack depending on the installation
conditions.
Half union or packed valve
Flare nut
Externally
threaded
side
Internally
threaded
side
Use a wrench
to secure.
Use a torque wrench
to tighten.
8-5-2. Vacuum Pumping
INFORMATION
In order to prevent any other refrigerant from being
charged accidentally, each port of the manifold has
been changed in shape.
Differences in Port Size between
Conventional R22 and R410A
Outer dia.
6,35mm
9,52mm
Tightening touque
N•m (kgf•m)
16 ~ 18 (1,6 ~ 1,8)
30 ~ 42 (3,0 ~ 4,2)
Port
size
Manifold for R22 Manifold for R410A
7/16 UNF 1/2 UNF
20 threads per inch 20 threads per inch
AIR PURGE
Evacuate the air in the connecting pipes and in
the indoor unit using vacuum pump.
Do not use the refrigerant in the outdoor unit.
For details, see the manual of vacuum pump.
<Use of vacuum pump>
(1) Connect the charge hose (A) from the manifold
valve to the charge inlet of the gas side packed
valve.
(2) Connect the charge hose (B) to the port of
vacuum pump.
(3) Open fully the low pressure side handle of the
manifold valve.
(4) Operate the vacuum pump.
(5) Close the low pressure side handle of manifold
valve after vacuumizing and stop the vacuum
pump.
Continue vacuumizing more than 15 minutes and
check the pressure gage indicates –0,1MPa
(–76 cmHg).
(6) Open the stems of packed valves A and B all the
way.
(7) Securely tighten the stem cap to each of the
packed valve stems.
… 30 …


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