Pipe Installation; Pipe Connection - Rheem ROMH36AFXZJ Manual De Instalación

4. PIPE INSTALLATION - 1

4. 1. Pipe connection

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.
4. 1. 1. Flaring
• Use special pipe cutter and fl are 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 fl are nut (always use the fl are nut attached to the indoor and outdoor
units respectively) onto the pipe and perform the fl are processing with a fl are tool.
Leakage of refrigerant may result if other fl are 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 fl ared uniformly
and is not cracked or scratched.
L
Dimension A [in. (mm)]
Pipe outside
Flare tool for R410A,
diameter [in. (mm)]
clutch type
1/4 (6.35)
3/8 (9.52)
1/2 (12.70) 0 to 0.020 (0 to 0.5)
5/8 (15.88)
3/4 (19.05)
• When using conventional fl are tools to fl are R410A pipes, the dimension A should
be approximately 0.020 in. (0.5 mm) more than indicated in the table (for fl aring
with R410A fl are tools) to achieve the specifi ed fl aring. Use a thickness gauge to
measure the dimension A.
Width across fl ats
Pipe outside
diameter
[in. (mm)]
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8( 15.88)
3/4 (19.05)
4. 1. 2. Bending pipes
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
diffi cult to bend or stretch them any more.
• Do not bend or stretch the pipes more than 3 times.
4. 1. 3. Pipe connection
Be sure to install the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the flare 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 outdoor unit pipe until immediately before con-
necting the connection pipe.
After installing the piping, make sure that the connection pipes do not touch the com-
pressor or outer panel. If the pipes touch the compressor or outer panel, they will
vibrate and produce noise.
CAUTION
B
Die
A
Pipe
0
Dimension B
- 0.4
[in. (mm)]
3/8 (9.1)
1/2 (13.2)
5/8 (16.6)
3/4 (19.7)
15/16 (24.0)
Width across fl ats
of Flare nut
[in. (mm)]
11/16 (17)
7/8 (22)
1 (26)
1-1/8 (29)
1-7/16 (36)
CAUTION
CAUTION
(1) Detach the caps and plugs from the pipes.
(2) Center the pipe against the port on the outdoor unit, and then turn the fl are nut
by hand.
To prevent gas leakage, coat the fl are
surface with alkylbenzene oil (HAB).
Do not use mineral oil.
(3) Attach the connection pipe.
2-way valve
(Liquid)
3-way valve (Gas)
(4) When the fl are nut is tightened properly by your hand, use a torque wrench to
fi nally tighten it.
With this model, the Holding wrench
can only be inserted horizontally.
Body side Flare nut
Holding
wrench
Torque wrench
Hold the torque wrench at its grip, keeping it in a 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 fi x the
elementary part with a holding wrench and fasten with a torque wrench (refer to below
diagram). Do not apply force to the blank cap of the valve or hang a wrench, etc., on the
cap. If blank cap is broken, it may cause leakage of 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.
Flare nut
Connection pipe
(Liquid)
Flare nut
Connection pipe
(Gas)
To prevent condensation
from dropping, insulate the
gap between the fl are nut
and the insulation of the
connection pipe.
Insulation of the
connection pipe
CAUTION
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)
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