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Extension piping and installation parts are field supply.
Perform the work only after carefully reading the
appropriate instructions.
Install the unit where the refrigerant piping is shortest,
the difference between the indoor unit and outdoor unit
is smallest.
As pipes purchased in the market may contain
dust, below them off with dry inlet gas.
Take care not to allow dust and water content to enter
the piping during pipe processing or installing.
Minimize the number of bends, and make the bending
radius as long as possible.
Always observe the restriction(allowable length, height
difference, pipe diameter) on the refrigerant piping.
For soldering & brazing, use high-quality materials.
Never purge air with a refrigerant. Always use a vacuum pump for purging.
Provide proper insulation to the piping . Insufficient insulation cause poor cooling/heating
performance or condensation drip, leading to unexpected trouble.
Do not insulate gas or low pressure pipe and liquid or high pressure pipe together.
For the connection of the refrigerant piping, leave the valve of the outdoor unit fully closed
(as set before shipment), and no operate it until the connection between the indoor/outdoor
units and refrigerant piping, refrigerant leak test and evacuation work have been completed.
The maximum permissible values are shown below.
Remove the cover (grommet) attached sheet metal at exit of heat exchanger pipe of indoor
unit before connecting the local piping.
(This cover is protect the pipe from sheet metal edge at unit transportation.)
Please insulate liquid pipe & gas pipe (two places for each) with an insulated pipe of the
attachment after connecting piping.
Finishing tape
Gas pipe
Insulating material
Liquid pipe
Good example
Electric wire
Electric wire
Finishing tape
Gas pipe
Insulating material
Liquid pipe
Bad example
Refrigerant piping
4.
Dimension A (m)
Dimension B (m)
Number of bends
Total piping length (m)
Piping
Liquid pipe (mm)
size
Gas pipe (mm)
PEH-5
12.7
PE(H)-7 PE(H)-8 PE(H)-10
20
30
15
50
15.88
50
19.05
20
30
15
50
25.4
15.88
20
30
15
25.4
50
20
30
15
PE(H)-15
50
20
30
15
2×25.4
2×15.88
PE(H)-20
50
20
30
15
2×28.6
15.88
28.6
2×15.88
A
B
When the outdoor unit is lower
When the outdoor unit is higher
C
C