Refrigerant Pipe Installation - Samsung DVM S VRF Technical Data Book

10. Installation

Refrigerant pipe installation

Refrigerant pipe work
f The length of refrigerant pipe should be as short as possible and the height difference between an indoor and
outdoor unit should be minimized.
f Piping work must be done within allowable piping length, height difference, and the allowable length after
branching.
f The pressure of the R-410A is high. Use only certified refrigerant pipe and follow the installation method.
f After installing the pipes, calculate the total length of the pipe to check if additional refrigerant is needed. When
you need to charge the additional refrigerant, make sure to use R-410A refrigerant.
f Use clean refrigerant pipe and there shouldn't be any harmful ion, oxide, dust, iron content or moisture inside
pipe.
f Use tools and accessories that fit on R-410A only.
Tool
Pipe cutter
Flaring tool
Refrigerant
machine oil
Torque wrench
Pipe bender
Nitrogen gas
Air tightness test
Welder
Manifold gage
tional refrigerant
Refrigerant
charging hose
Vacuum pump
Scale for refrig-
erant charging
Gas leak detec-
tor
Flare nut
140
Installation process/purpose
Pipe cutting
Pipe flaring
Apply refrigerant
Refrigerant pipe
oil on flared part
installation
Connect flare nut
with pipe
Pipe bending
Prevent oxida-
tion within the
Pipe welding
Air tightness Vacuuming,
test ~ addi- charging refrig-
erant and check-
charging ing operation
Pipe drying
Refrigerant charging
Gas leak test
Must use the flare nut equipped with the product. Refrigerant leakage may occur when the conven-
Exclusive ether oil, ester oil, alkali benzene oil or synthetic oil
pipe
Need exclusive one to prevent mixture of R-22 refrigerant oil
use and also the measurement is not available due to high
Need exclusive one since there is risk of refrigerant leakage or
Compatible (Use products which contain the check valve to
prevent the oil from flowing backward into the outdoor unit.)
Use the one that can be vacuumed up to -100.7kpa(5Torr).
tional flare nut for R-22 is used.
Compatibility with conventional tool
Compatible
Compatible
pressure
inflow of impurities
Compatible
Need exclusive one
(Ones used for R-134a is compatible)