Refrigerant Piping - Toshiba RAV-GE1301BP Series Installation Manual

7

Refrigerant piping

CAUTION
When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 m to 3 m to clamp the
refrigerant pipe. Otherwise, abnormal sound may be
generated.
Permissible piping length and
height difference
They vary depending on the outdoor unit. For details,
refer to the Installation Manual attached to the outdoor
unit.
CAUTION CAUTION
IMPORTANT 4 POINTS FOR PIPING WORK
1. 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.
2. Tight connection (between pipes and unit)
3. Evacuate the air in the connecting pipes by using
VACUUM PUMP.
4. Check the gas leakage. (Connected points)
Pipe size
Pipe size (mm)
Model
Gas side Liquid side
GE130, GE180 Ø12.7 Ø6.4
GE240, GE300, GE360,
Ø15.9 Ø9.5
GE400, GE420, GE480
Ø19.1 Ø9.5
GE600
27-EN
1116950140_01_EN.indd 14 1116950140_01_EN.indd 14
Connecting refrigerant piping
Flaring
Cut the pipe with a pipe cutter.
Remove burrs completely.
Remaining burrs may cause gas leakage.
Insert a flare nut into the pipe, and flare the pipe.
As the flaring sizes of R32 differ from those of
refrigerant R22, the flare tools newly manufactured
for R32 are recommended.
However, the conventional tools can be used by
adjusting projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
Outer dia. of Conventional
Tool used
copper pipe tool used
6.4, 9.5
0 to 0.5 1.0 to 1.5
12.7, 15.9, 19.1
Flaring diameter size: A (Unit: mm)
+0
Outer dia. of copper pipe A
–0.4
6.4 9.1
9.5 13.2
12.7 16.6
15.9 19.7
19.1 24.0
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.
Check that the flared part is not scratched, deformed,
stepped, or flattened, and that there are no chips
adhered or other problems, after flare processing.
Do not apply refrigerating machine oil to the flare
surface.
* In case of flaring with the conventional flare tool,
pull it out approx. 0.5 mm more than that for R22 to
adjust to the specified flare size. The copper pipe
gauge is useful for adjusting projection margin size.
The sealed gas was sealed at the atmospheric
pressure so when the flare nut is removed, there will
no "whooshing" sound: This is normal and is not
indicative of trouble.
Use two wrenches to connect the indoor unit pipe.
Work using double spanner
Use the tightening torque levels as listed in the
following table.
Outer dia. of connecting
Tightening torque (N m)
pipe (mm)
6.4 14 to 18 (1.4 to 1.8 kgf m)
9.5 34 to 42 (3.4 to 4.2 kgf m)
12.7 49 to 61 (4.9 to 6.1 kgf m)
15.9 63 to 77 (6.3 to 7.7 kgf m)
19.1 95 to 115 (9.5 to 11.5 kgf m)
Tightening torque of flare pipe connections
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.
CAUTION
Tightening with an excessive torque may crack the nut
depending on installation conditions.
– 14 –
Evacuation
Perform vacuuming from the charge port of valve of the
outdoor unit by using a vacuum pump.
For details, follow to the Installation Manual attached to
the outdoor unit.
Do not use the refrigerant sealed in the outdoor unit
for evacuation.
REQUIREMENT
For the tools such as charge hose, use those
manufactured exclusively for R32.
Refrigerant amount to be added
For addition of the refrigerant, add refrigerant "R32"
referring to the attached Installation Manual of
outdoor unit.
Use a scale to charge the refrigerant of specified
amount.
REQUIREMENT
Charging an excessive or too little amount of
refrigerant causes a trouble of the compressor.
Charge the refrigerant of specified amount.
A personnel who charged the refrigerant should write
down the pipe length and the added refrigerant
amount in the F-GAS label of the outdoor unit. It is
necessary to fix the compressor and refrigeration
cycle malfunction.
Open the valve fully
Open the valve of the outdoor unit fully. A 4 mm-
hexagonal wrench is required for opening the valve.
For details, refer to the Installation Manual attached to
the outdoor unit.
Gas leak check
Check with a leak detector or soap water whether gas
leaks or not, from the pipe connecting section or cap of
the valve.
REQUIREMENT
Use a leak detector manufactured exclusively for HFC
refrigerant (R32, R134a, R410A, etc.).
11/13/18 2:18 PM 11/13/18 2:18 PM
EN
ID
TH
28-EN