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Refrigerant piping work
3.2 piping materialS
1 Prepare locally-supplied refrigerant pipes.
2 Select clean copper pipes. Make sure there is no dust and
moisture inside of the pipes. Blow the inside of the pipes with
nitrogen or dry air, to remove any dust or foreign materials
before connecting pipes. Do not use any tools such as a saw
or a grinder, which produce a lot of swarf.
3 The refrigerant oil for the refrigerant R410A is susceptible
to moisture, an oxide film and oil and fat. Take special care
When installing pipe through the wall, secure
a cap at the end of the pipe.
Correct
Attach a cap or vinyl tape
3.3 piping connection
1 Flaring dimension is as shown in the table. Check that there
are no scratches, adhered grinding swarf, deformation or
surface unevenness at the flaring part.
2 Use the flare nut (Accessory) in conformity to JIS B8607.
3 Before tightening the flare nut, apply the refrigerant oil
(field-supplied) in thin layer over the flaring part. (Do not
apply the oil on other portions.) Tighten the flare nut for the
liquid pipe to the specified torque with two spanners. Then,
tighten the flare nut for the gas pipe in the same way. After
the tightening work has been completed, check that no
refrigerant leakage occurs.
?
n o t e
Refrigerant oil is field-supplied. [Ethereal Oil FVC68D (Idemitsu Kousan
Co. Ltd.)]
•
Flaring dimension
+ 2
90
o
o
φA
0.4 ~ 0.8R
φd
•
Required torque
pipe size
tightening torque
Ø6.35 (1/4'')
14-18 N.m
Ø9.52 (3/8'')
34-42 N.m
9
PMML0268A rev.4 - 02/2020 - P5416576
Do not place the pipe directly on the
Incorrect
Correct
Attach a cap or vinyl tape
Unit: mm (in.)
+0
diameter (Ød)
a
-0.4
(1/4)
6.35
9.1
(3/8)
9.52
13.2
•
Two spanner work
during the installation so that moisture, contaminations or old
refrigerant oil will not enter the refrigerant cycle. Otherwise,
impurities may adhere to the expansion valve and it may
prevent the proper operation.
4 Use a pipe cutter for cutting the refrigerant piping. Before
connecting the piping, blow the dust inside the pipe off with
air blow or nitrogen blow. (Do not use such tools as a saw or
a grinder, which can produce much chips or swarfs).
Correct
ground.
Incorrect
Attach a cap or vinyl bag with rubber band
Apply Refrigerant Oil.
Apply refrigerant oil
•
Insulation on pipes
Extension cable for expansion valve kit
*) Do not run this cable through the inside of the
insulation material. Otherwise, the gap may form
Main
body
Insulation
(accessory)
4 If ambient temperature and humidity inside the false ceiling
exceed 27oC/RH80%, attach the insulation (approx. 5 to 10m
thickness) on the insulation at piping connection because dew
condensation water may occur on the surface of the insulation.
5 The pipes should be protected in order to avoid damage
from external force such as an earthquake.
6 Support the pipes with clearance towards the axis to avoid
thermal stress.
7 Ceiling material should be strong enough. Abnormal noise
may be heard due to piping vibration.
8 Prevent the piping from touching weak portions such as wall,
ceiling, etc. If not, vibration of the pipe may cause abnormal
noise.
Incorrect
Rain water can enter
Do not apply the
refrigerant oil to
the outside of the
flaring part
and it may cause condensation.
Refrigerant piping
(field-supplied)
Insulation (for piping)
(field-supplied)
Insulation (for piping)
(accessory)
Insulation must be secured with cord clamps
(3 Portions) (Accessory)
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