Toshiba RAV-SP1104AT8-E1 Service Manual page 88

5
REFRIGERANT PIPING
Knockout of Pipe Cover
Knockout procedure
Rear direction
Pipe cover
Side direction
Front direction
Down direction
• The indoor/outdoor connecting pipes can be
connected in 4 directions.
Take off the knockout part of the pipe cover through
which pipes or wires will pass through the base plate.
• Detach the pipe cover and tap on the knockout section
a few times with the shank of a screwdriver. A
knockout hole can easily be punched.
• After punching out the knockout hole, remove burrs
from the hole and then install the supplied protective
bush and guard material around the passage hole to
protect wires and pipes.
Be sure to attach the pipe covers after pipes have
been connected. Cut the slits under the pipe covers to
facilitate the installation.
After connecting the pipes, be sure to mount the pipe
cover. The pipe cover is easily mounted by cutting off
the slit at the lower part of the pipe cover.
* Be sure to wear heavy work gloves while working.
EN-127
Optional Installation Parts
(Locally procured)
Parts name Q'ty
Refrigerant piping
A Liquid side: Ø9.5 mm One each
Gas side: Ø15.9 mm
Pipe insulating material
B 1
(polyethylene foam, 10 mm thick)
C Putty, PVC tape One each
Refrigerant Piping Connection
CAUTION
TAKE NOTE OF THESE 4 IMPORTANT POINTS
BELOW FOR PIPING WORK
1. Keep dust and moisture away from inside the
connecting pipes.
2. Tightly connect the connection between pipes and
the unit.
3. Evacuate the air in the connecting pipes using a
VACUUM PUMP.
4. Check for gas leaks at connection points.
Piping connection
Liquid side
Outer diameter Thickness
Ø9.5 mm 0.8 mm
Gas side
Outer diameter Thickness
Ø15.9 mm 1.0 mm
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert a flare nut into the pipe, and then flare the
pipe.
Use the flare nuts supplied with the air conditioner
or those for R410A.
Insert a flare nut into the pipe, and flare the pipe.
As the flaring sizes of R410A differ from those of
refrigerant R22, the flare tools newly manufactured
for R410A are recommended.
However, the conventional tools can be used by
adjusting the projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
B
Rigid (Clutch type)
R410A tool
Outer diam. of
used
copper pipe
R410A
9.5
0 to 0.5
15.9
Flaring diameter size: A (Unit: mm)
A
Outer diam. of copper
pipe
9.5
15.9
* In case of flaring for R410A with the conventional flare
tool, pull the tool out approx. 0.5 mm more than that
for R22 to adjust it to the specified flare size.
The copper pipe gauge is useful for adjusting the
projection margin size.
- 64 -
Tightening of Connecting Part
1. Align the centers of the connecting pipes and fully
tighten the flare nut with your fingers. Then fix the
nut with a wrench as shown in the figure and tighten
it with a torque wrench.
Half union or packed valve
Externally
threaded side
Fix with wrench. Tighten with torque wrench.
2. As shown in the figure, be sure to use two wrenches
to loosen or tighten the flare nut of the valve on the
gas side. If you use a single crescent, the flare nut
cannot be tightened to the required tightening torque.
On the other hand, use a single crescent to loosen
or tighten the flare nut of the valve on the liquid side.
Conventional
tool used
Outer dia.
1.0 to 1.5
Ø9.5
Ø15.9
Cap
Loosened
+0
A
–0.4
13.2
19.7
Valve at gas side
Flare nut
Internally
threaded side
(Unit: N•m)
Tightening torque
33 to 42
33 to 42
Cover
Piping valve
Tightened
Flare nut
EN-128