Vacuum Pumping; Use Of Vacuum Pump; Packed Valve Handling Precautions; A5 Mm Hexagon Wrench Is Required - Toshiba RAS-10YKH-E Service Manual

8-5-3. 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
Manifold for R22
Port 7/16 UNF
size 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.
Manifold for R410A
1/2 UNF
20 threads per inch
– 38 –
Pressure gage
Low pressure side handle
Charge hose (A)
Outdoor unit
Indoor unit
Gas
(Ø9,52)
A
C
D
B
Liquid
(Ø6,35)
Fig. 8-5-5
CAUTION
• KEEP IMPORTANT 4 POINTS FOR
INSTALLATION (PIPING WORK)
(1) Take away dust and moisture (Inside of the
connecting pipes.)
(2) Tight connection (between pipes and unit)
(3) Evacuate the air in the connecting pipes using
VACUUM PUMP .
(4) Check gas leak (connected points)
<Packed Valve Handling Precautions>
• Open the valve stem all the way out; so not try
to open it beyond the stopper.
• Securely tighten the valve stem cap with the
wrench or like.
• Valve stem cap tightening torque is as follows;
Gas pipes side (Ø12,7) : 49 ~ 62 N•m (5,0 ~ 6,2 kgf•m)
Gas pipes side (Ø9,52) : 30 ~ 42 N•m (3,0 ~ 4,2 kgf•m)
Liquid pipe side (Ø6,35) : 16 ~ 18 N•m (1,6 ~ 1,8 kgf•m)
Service port cap : 9 ~ 10 N•m (0,9 ~ 1,0 kgf•m)
<A5 mm hexagon wrench is required.>
Flare nut
Valve body
Stopper
Service port
Valve stem
Service port cap
Note : Service port at Gas pipes valve only.
Fig. 8-5-6
Manifold valve
High pressure
side handle
Lo Hi
Charge
hose (B)
Service port
VP
Packed
valve
Wrench
Valve stem cap