Pipe Installation - Rheem RHMV4821SNACJA Manual De Instalación

Fig. A
Service
panel
Fig. B
Slit
Slit
Front connection Lateral connection

3.8. Pipe installation

• Do not use mineral oil on a fl ared part. Prevent mineral oil from getting into the
system as this would reduce the lifetime of the units.
• While welding the pipes, be sure to blow dry nitrogen gas through them.
• The maximum lengths of this product are shown in the table. If the units are further
apart than this, correct operation cannot be guaranteed.
■ Flaring
Use special pipe cutter and flare tool exclusive for R410A.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that the cuttings will not enter the pipe and remove any
burrs.
(3) Insert the flare nut (always use the flare nut attached to the indoor and outdoor units
respectively) onto the pipe and perform the flare processing with a flare tool. Leakage
of refrigerant may result if other flare nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Check if [L] is flared uniformly
and is not cracked or scratched.
L
Dimension A [in (mm)]
Pipe outside diameter
Flare tool for R410A,
[in (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
When using conventional (R22) flare tools to flare R410A pipes, the dimension A should
be approximately 0.020 in (0.5 mm) more than indicated in the table (for flaring with
R410A flare tools) to achieve the specified flaring. Use a thickness gauge to measure the
dimension A. It is recommended that a R410A flaring tool is used.
Pipe outside diameter
Width across
[in (mm)]
flats
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
9374995677-02_IM.indb 7 9374995677-02_IM.indb 7
Fig. C
Bottom
connection
Bottom connection Rear connection
CAUTION
B
Die
A
Pipe
0 (0)
Dimension B
-0.015 (-0.4)
[in (mm)]
clutch type
3/8 (9.1)
1/2 (13.2)
0 to 0.020
5/8 (16.6)
(0 to 0.5)
3/4 (19.7)
15/16 (24.0)
Width across flats of Flare nut
[in (mm)]
11/16 (17)
7/8 (22)
1 (26)
1-1/8 (29)
1-7/16 (36)
■ Bending pipes
CAUTION
• To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 4 in (100 mm) or more.
• If the pipe is bent repeatedly at the same place, it will break.
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes at an angle of more than 90°.
• When pipes are repeatedly bent or stretched, the material will harden, making it difficult
to bend or stretch them anymore.
• Do not bend or stretch the pipes more than 3 times.
■ Flare connection
CAUTION
• Be sure to apply the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the fl are nut cannot be tightened smoothly. If
the fl are nut is forced to turn, the threads will be damaged.
• Do not remove the fl are nut from the indoor unit pipe until immediately before
connecting the connection pipe.
• After installing the piping, make sure that the connection pipes do not touch the
compressor or outer panel. If the pipes touch the compressor or outer panel, they
will vibrate and produce noise.
(1) Detach the caps and plugs from the
pipes.
(2) Center the pipe against the port on
the outdoor unit, and then turn the
flare nut by hand.
(3) Tighten the flare nut of the connec-
tion pipe at the outdoor unit valve
connector.
(4) After tightening the flare nut by hand,
use a torque wrench to fully tighten it.
CAUTION
Hold the torque wrench at its grip, keeping it in the right angle with the pipe, in order to
tighten the fl are nut correctly.
Outer panel may be distorted if
fastened only with a wrench. Be
sure to fix the elementary part with a
holding wrench (spanner) and fasten
with a torque wrench (refer to the
right diagram). Do not apply force to
the blank cap of the valve or hang a
wrench, etc., on the cap. If blank cap
Holding
is broken, it may cause leakage of
wrench
refrigerant.
Flare nut [in (mm)]
1/4 (6.35) dia.
3/8 (9.52) dia.
1/2 (12.70) dia.
5/8 (15.88) dia.
3/4 (19.05) dia.
■ Handling precautions for the valves
• Mounted part of Blank cap is sealed for protection.
• Fasten blank cap tightly after opening valves.
Operating the valves
• Use a hexagon wrench (size 4 mm).
Opening:
(1) Insert the hexagon wrench into the
valve shaft, and turn it counterclock-
wise.
(2) Stop turning when the valve shaft can
no longer be turned. (Open position)
Closing:
(1) Insert the hexagon wrench into the
valve shaft, and turn it clockwise.
(2) Stop turning when the valve shaft can
no longer be turned. (Closed position)
3-way valve (Liquid)
3-way
valve (Gas)
Flare nut Flare nut
Connection
Connection
pipe (Gas)
pipe (Liquid)
Blank cap
Flare nut
Torque wrench
90°
Torque
wrench
Tightening torque [lbf·ft. (N·m)]
11.8 to 13.3 (16 to 18)
23.6 to 31.0 (32 to 42)
36.1 to 45.0 (49 to 61)
46.5 to 55.3 (63 to 75)
66.4 to 81.1 (90 to 110)
Opening
direction
Opening
Hexagon wrench
direction
Seal
(blank cap
installation
portion)
Liquid
Gas pipe
pipe
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