Tightening Connection - Toshiba RAV-SM2242DT-E Installation Manual

Concealed Duct High Static Pressure

Tightening connection

Do not apply excessive torque. Otherwise, the nut
may crack depending on the conditions.
Outer dia. of copper pipe
12.7 mm (dia.)
M Tightening torque of flare pipe connections
Pressure of R410A is higher than that of R22.
(Approx. 1.6 times) Therefore, using a torque wrench, tighten
the flare pipe connecting sections which connect the indoor
and outdoor units of the specified tightening torque.
Incorrect connections may cause not only a gas leak, but also
a trouble of the refrigeration cycle.
Align the centres 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.
Half union
Externally
threaded side
Use a wrench to secure.
REQUIREMENT
Tightening with an excessive torque may crack the nut
depending on installation conditions.
Tighten the nut within the specified tightening torque.
„ Gas side refrigerant pipe
connection
• Turn up the pipe heat insulator to the unit side.
• Wrap the pipe with wet cloth.
Wet cloth
23-EN
CAUTION
(Unit: N•m)
Tightening torque
50 to 62 (5.0 to 6.2 kgf•m)
Flare nut
Internally
threaded side
Use a torque wrench to tighten.
Turn up pipe heat
insulator
Remove the all
brazed part.
• Remove the cup on the gas side piping by using a brazing
machine.
Do not burn the pipe heat insulator.
• Braze the attached joint part to the gas side piping and
braze the connection piping to the joint part.
Braze all around
• Turn back the pipe heat insulator and tie up with a banding
band.
Tie up with a banding
band.
Piping with outdoor unit
• For details of installation, refer to the Installation Manual of
the outdoor unit.
„ Evacuation
Using a vacuum pump, perform vacuuming from the charge
port of valve of the outdoor unit.
For details, follow to the Installation Manual attached to the
outdoor unit.
• Never use the refrigerant sealed in the outdoor unit for
evacuation.
REQUIREMENT
For the tools such as charge hose, etc., use those
manufactured exclusively for R410A.
– 23 –
Installation Manual
CAUTION
Remove the cap.
Attached joint part
Connection pipe
Locally procured
Ø28.6 mm
brazing
brazing