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13. Installation
Tools used for refrigerant pipe installation
Product using R-410A/R-134a refrigerant requires exclusive tools . Check the c onventional tools for compatibility before
installation .
Tool
Pipe cutter
Flaring tool
Refrigerating machine
Refrigerant
oil
pipe work
Torque wrench
Pipe bender
Nitrogen gas
Air tightness test
Welder
Air tightness
Manifold gauge
test ~ additional
refrigerant
Refrigerant charging
charging
hose
Vacuum pump
Vacuum drying
Scale for refrigerant
charging
Gas leak detector
Must use the flare nut equipped with the product .
Flare nut
Refrigerant leakage may occur when the conventional flare nut for R-22 is used .
Selecting refrigerant pipe
•
Install the refrigerant pipe according to main pipe size for each capacities of DVM Hydro unit / Hydro unit HT .
Model name of DVM Hydro unit
Liquid side
Refrigerant
side
Gas side
Work
Pipe cutting
Pipe flaring
Apply refrigerant oil
on flared part
Connect flare nut with pipe
Pipe bending
Inhibition of oxidation
Pipe welding
Vacuuming, charging and
checking operation
Compatible (Use products which contains the check valve to prevent the oil
from flowing backward into the outdoor unit .)
Use the one that can be vacuumed up to 100 .7 kP a (14 .6 psi, 5 Torr) .
Compatible
Gas leak test
AM036CNBDCH
AM048CNBDCH
AM048CNBFCB
AM072CNBFCB
3/8" (ø9 .52)
5/8" (ø15 .88)
Compatibility with conventional tool
Compatible
Use exclusive ether oil, ester oil, alkali benzene oil
or mixture of these oils
Compatible
Need exclusive one to prevent mixture of R-22
refrigerant oil use and also the measurement is
not available due to the high pressure .
Need exclusive one due to the refrigerant leakage
or inflow of impurities .
Need exclusive one
(Ones used for R-134a is compatible)
AM096CNBDCH
3/8" (ø9 .52)
7/8" (ø22 .23)
AM144CNBDCH
1/2" (ø12 .7)
1-1/8" (ø28 .58)
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