1
3
. Installation
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
AM036CNBDCH
AM048CNBDCH
AM048CNBFCB
AM072CNBFCB
AM096CNBDCH
AM144CNBDCH
Refrigerant
side
Liquid side
3/8” (ø9 .52)
3/8” (ø9 .52)
1/2” (ø12 .7)
Gas side
5/8” (ø15 .88)
7/8” (ø22 .23)
1-1/8” (ø28 .58)
Tools used for refrigerant pipe installation
Product using R-410A/R-134a refrigerant requires exclusive tools . Check the conventional tools for compatibility before
installation .
Tool
Work
Compatibility with conventional tool
Pipe cutter
Refrigerant
pipe work
Pipe cutting
Compatible
Flaring tool
Pipe flaring
Refrigerating machine
oil
Apply refrigerant oil
on flared part
Use exclusive ether oil, ester oil, alkali benzene oil
or mixture of these oils
Torque wrench
Connect flare nut with pipe
Compatible
Pipe bender
Pipe bending
Nitrogen gas
Air tightness test
Inhibition of oxidation
Welder
Pipe welding
Manifold gauge
Air tightness
test ~ additional
refrigerant
charging
Vacuuming, charging and
checking operation
Need exclusive one to prevent mixture of R-22
refrigerant oil use and also the measurement is
not available due to the high pressure .
Refrigerant charging
hose
Need exclusive one due to the refrigerant leakage
or inflow of impurities .
Vacuum pump
Vacuum drying
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 kPa (14 .6 psi, 5 Torr) .
Scale for refrigerant
charging
Compatible
Gas leak detector
Gas leak test
Need exclusive one
(Ones used for R-134a is compatible)
Flare nut
Must use the flare nut equipped with the product .
Refrigerant leakage may occur when the conventional flare nut for R-22 is used .
