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Refrigerant piping work
3.3 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 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).
When installing pipe through the wall, secure
a cap at the end of the pipe.
Correct
Attach a cap or vinyl tape
3.4 PIPING CONNECTION
1 Flaring dimension is as shown in the table. Check that there
are no scratches, adhered grinding swarf, deformation or sur-
face 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
18
Do not place the pipe directly on the
ground.
Incorrect
Correct
Unit: mm (in.)
Diameter (Ød)
A
(1/4)
6.35
9.1
(3/8)
9.52
13.2
•
Two spanner work
PMML0268A rev.1 - 09/2015 - P5416576
Incorrect
Attach a cap or vinyl tape
•
Insulation on pipes
Main
body
Insulation
(accessory)
+0
-0.4
4 If ambient temperature and humidity inside the false ceiling
exceed 27
thickness) on the insulation at piping connection because
dew condensation water may occur on the surface of the in-
sulation.
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.
Correct
Rain water can enter
Attach a cap or vinyl bag
with rubber band
Apply Refrigerant Oil.
Apply refrigerant oil
Do not apply the
refrigerant oil to
the outside of the
flaring part
Extension cable for expansion valve kit
*) Do not run this cable through the inside of the
insulation material. Otherwise, the gap may form
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)
C/RH80%, attach the insulation (approx. 5 to 10m
o
Incorrect
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