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Countermeasures when exceeding the limit concentration
a. Please install a mechanical ventilation device.
b. If it is impossible to change air frequently, please install
a leak detection alarm device connected with the
mechanical ventilation device.
4.3 Selecting and Preparing the
Refrigerant Piping
4.3.1 Refrigerant piping requirements
NOTE
The R410A refrigerant pipeline system must be
kept strictly clean, dry and sealed.
Cleaning and drying: prevent foreign objects
(including mineral oil or water) from mixing
into the system.
Seal: R410A does not contain fluorine, does
not destroy the ozone layer, and does not
deplete the ozone layer that protect the earth
from harmful ultraviolet radiation. But if it is
released, R410A can also cause a slight
greenhouse effect. Therefore, you must pay
special attention when you check the sealing
quality of the installation.
The piping and other pressure vessels must
comply with the applicable laws and suitable
for use with the refrigerant. Use only
phosphoric acid deoxidized seamless copper
for the refrigerant piping.
Foreign objects in the pipes (including lubricant used
during pipe bending) must be ≤ 30 mg/10m.
Calculate all piping lengths and distances.
Table 4.1 Pipe and Component Names
Name
Indoor unit main pipe
Indoor unit branch joint
Indoor unit auxiliary connection pipe
Main pipe
4.3.2 Allowable length and height
difference for refrigerant piping
Refer to the following table and figure (for
reference only) to determine the appropriate size.
The equivalent length of each elbow and
U-shape branch joint is 0.5m, the equivalent
length of each branch header is 1m.
As much as possible, install the indoor units
such that they are equidistant on both sides
of the U-shape branch joint.
When the outdoor unit is above the indoor
unit, and the level difference exceeds 20 m, it
is recommended that an oil return bend be
set up at every 10 m interval on the gas pipe
of the main piping. The recommended
specifications of the oil return bend are as
shown in figure 4.11.
The allowable length of the farthest indoor
unit to the first branch joint in the system
should be equal to or less than 40m unless
specified conditions are met, in which case
the permitted length is up to 90m. Please
refer to requirement 2.
Special-purpose
manufacturer for all branch joints should be
used. Failing to do so may lead to severe
system malfunction.
Designation
L2 to L10
A to J
a to n
L1
18
NOTE
branch
joints
from
Fig. 4.10
V.1
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