Refrigerant Piping - Toshiba RAS-4M27U2AVG-E Installation Manual

Outdoor Unit
6

Refrigerant piping

CAUTION
Install in rooms that are 13 m
a leak of refrigerant gas occurs inside the
room, an oxygen defi ciency may occur.
7 Detaching the Front Panel
Remove the 5 screws.
• Pull out the front panel according to the direction of the arrows on the
illustration below.
7 Refrigerant Piping Connection
Flaring
1. Cut the pipe with a pipe cutter.
90°
2. Remove the burr inside of the pipe.
When removing the burr, be careful so that chips do not fall into the pipe.
3. Remove the fl are nuts attached to the outdoor/indoor unit, then insert them
into each of the pipes.
4. Flare the pipes.
See the following table for the projection margin (A) and fl aring size (B).
A
Pipe
Die
Pipe A
Rigid
(clutch
Outside
diameter Thickness type)
R32
tool
mm mm mm
6.35 0.8 0 to 0.5
9.52 0.8 0 to 0.5
12.7 0.8 0 to 0.5
CAUTION
• Do not scratch the inner surface of the
flared part when removing burrs.
• Flare processing under the condition of
scratches on the inner surface of flare
processing part will cause refrigerant gas
leak.
Pipe connection
1. Make wire and pipe connections for each indoor unit separately.
2. Align the centres of the connecting pipes and tighten the fl are nut as much
as possible with your fi ngers, then tighten the nut using a torque wrench. Be
sure to tighten the nut at the specifi ed torque value.
• If you use one outdoor unit for several indoor units of a different class,
connect the largest one fi rst A, then connect the rest in the order B to E.
• Do not remove the fl are nuts for any ports you are not going to use for
connection.
• Do not leave the fl are nut unattached for a long period of time.
• Use a different-diameter joint if the diameters of the connection port and
connection piping are different.
• Mount the different-diameter joint on the connection port of the outdoor unit.
or larger. If
3
Roughness
Obliquity Warp
B
B Flare Nut
Imperial
(wing Width
Tighten
nut type) across
torque
R32 fl at
tool
mm mm mm N•m
1.5 to 14 to
9.1 17
2.0 18
1.5 to 33 to
13.2 22
2.0 42
2.0 to 50 to
16.6 26
2.5 62
CAUTION
• KEEP IMPORTANT 6 POINTS FOR
PIPING WORK.
(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.
(6) Reusable mechanical connectors
and flared joints are not allowed
indoors. When mechanical connectors
are reused indoors, sealing parts
shall be renewed. When flared joints
are reused indoors, the flare part
shall be refabricated.
7 Air Purge
From the sake of environmental protection, use a vacuum pump to extract
the air during installation.
* Prepare a 4 mm hexagon wrench.
1. Connect a charge hose.
• Make sure that the Handle Hi of the gauge manifold valve is closed fully.
• Connect the port of the gauge manifold valve and the service port (Valve
core (Setting Pin)) using the charge hose.
NOTE
If a control valve or charge valve is attached to the charge hose, leak
of R32 refrigerant can be avoided.
2. Open the Handle Low of the gauge manifold valve fully, then operate the
vacuum pump.
• Loosen the fl are nut of the at the gas end a little to make sure that air is
taken in, then tighten the nut.
• If you fi nd air is not taken in, make sure that the charge hose is
connected to the port(s) securely.
• Perform extraction for about 40 minutes and make sure that the
compound pressure gauge reading is –101 kPa (–76 cmHg).
• If the compound pressure gauge reading is not –101 kPa (–76 cmHg),
there is a possibility air is being taken in from the port(s).
kgf•m
• Make sure that the charge hose is connected to the port(s) securely.
1.4 to
3. Close the Handle Low of the gauge manifold valve fully, then stop
1.8
operating the vacuum pump.
3.3 to
• Leave the gauge and pump as they are for 1 or 2 minutes, then make
4.2
sure that the compound pressure gauge reading stays at –101 kPa
5.0 to
(–76 cmHg).
6.2
• You need not add refrigerant if the piping length is 40 m or less.
If the length exceeds 41 m, add 20 g of refrigerant per 1meter over.
4. Disconnect the charge hose from the service port, then open the valve
stem fully using a 4 mm hexagon wrench.
Hexagon wrench is
required.
5. Tighten the service valve stem cap and service port cap securely.
CAUTION
Use a torque wrench and tighten the nut at
the specifi ed torque value.
10
Installation Manual
Service port cap
Valve stem cap