Hitachi RAS-3.0HNSKQ Original Instruction page 14

■: Interchangeability is available with current R22
▼: Prohibited
Measuring Instrument and Tool
Pipe Cutter,
Chamfering
Reamer
Flaring Tool
Extrusion
Adjustment Gauge
Pipe Bender
Refrigerant
Expanding Tool
Pipe
Torque Wrench
Brazing Tool
Nitrogen Gas
Lubrication Oil (for
Flare Surface)
Refrigerant
Cylinder
Vacuum Pump
Adapter for
Vacuum Pump
(Check Valve)
Vacuum
Drying
Manifold Valve
l
Refrigerant
Charge
Charging Hose
Charging Cylinder
Weight Scale
Refrigerant Gas
Leakage Detector
※: Interchangeability with R407C.
Interchangeability
Reason of Non-Interchangeability and Attention
with R22
R410A R407C
■ ■
* The flaring tools for R407C are applicable to R22.
■
■
* If using flaring tube, make dimension of tube
larger for R410A.
-
●
* In case of hard temper pipe, flaring is not
available.
* In case of hard temper pipe, bending is not
available.
■ ■
Use elbow for bend and braze.
* In case of hard temper pipe, expanding of tube is
■ ■
not available. Use socket for connecting tube.
* For 12.7mm D., 15.88mm D., wrench size is up
● ■
2mm.
* For 6.35mm D., 9.53mm D., 19.05mm D., wrench
■ ■
size is the same.
■ ■
* Perform correct brazing work.
* Strict control against pollution (Blow nitrogen
■ ■
during brazing.)
Use a synthetic oil which is equivalent to the oil
used in the refrigeration cycle.
● ★
Synthetic oil absorbs moisture quickly.
* Check refrigerant cylinder color.
● ★ ○ Liquid refrigerant charging is required regarding
zeotropic refrigerant.
■ ■
○ It is required to mount a vacuum pump adapter
(check valve) to prevent oil of the vacuum pump
※●
★
from being pulled when the vacuum pump stops.
○ Use manifold and charging hoses designed for
each refrigerant as design pressure is different. Do
● ★
not share manifold and charging hoses with other
refrigerant type to prevent mixing of different type of
refrigerant oil. (If use, it may cause cycle choking or
compressor failure.)
● ★
Standard of Connection Diameter; R410A: UNF1/2,
R407C: UNF7/16.
* Use the weight scale.
▼ ▼
■ ■
* Use a detector designed for each refrigerant as
※● ★
detecting method is different.
●: Only for Refrigerant R410A (No Interchangeability with R22)
★: Only for Refrigerant R407C (No Interchangeability with R22)
(○: Strictly Required)
-
-
5
Use
Cutting Pipe
Removing Burrs
Flaring for Tubes
Dimensional Control
for Extruded Portion of
Tube after Flaring
Bending
Expanding Tubes
Connection of Flare Nut
Brazing for Tubes
Prevention from Oxidation
during Brazing
Applying Oil to the Flared
Surface
Refrigerant Charging
Vacuum Pumping
Vacuum Pumping,
Vacuum Holding,
Refrigerant Charging and
Check of Pressures
-
Measuring Instrument for
Refrigerant Charging
Gas Leakage Check