Hitachi RAS-070HNBRMQ2, Руководство пользователя

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■
: Interchangeability is available with current R22
●
: Only for Refrigerant R410A (No Interchangeability with R22)
▼
: Prohibited
★
: Only for Refrigerant R407C (No Interchangeability with R22)
Measuring Instrument and Tool
Interchangeability
with R22
Reason of Non-Interchangeability and Attention
(
○
: Strictly Required)
Use
R410A R407C
Refrigerant
Pipe
Pipe Cutter,
Chamfering
Reamer
■ ■
-
Cutting Pipe
Removing Burrs
Flaring Tool ■
■
* 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.
Flaring for Tubes
Extrusion
Adjustment Gauge
●
-
Dimensional Control
for Extruded Portion of
Tube after Flaring
Pipe Bender ■ ■
* In case of hard temper pipe, bending is not
available.
Use elbow for bend and braze.
Bending
Expanding Tool
■ ■
* In case of hard temper pipe, expanding of tube is
not available. Use socket for connecting tube.
Expanding Tubes
Torque Wrench
● ■
* For 12.7mm D., 15.88mm D., wrench size is up
2mm.
Connection of Flare Nut
■ ■
* For 6.35mm D., 9.52mm D., 19.05mm D., wrench
size is the same.
Brazing Tool
■ ■ * Perform correct brazing work.
Brazing for Tubes
Nitrogen Gas
■ ■
* Strict control against pollution (Blow nitrogen
during brazing.)
Prevention from Oxidation
during Brazing
Lubrication Oil (for
Flare Surface)
● ★
Use a synthetic oil which is equivalent to the oil
used in the refrigeration cycle.
Synthetic oil absorbs moisture quickly.
Applying Oil to the Flared
Surface
Vacuum
Drying
l
Refrigerant
Charge
Refrigerant
Cylinder
● ★
* Check refrigerant cylinder color.
○
Liquid refrigerant charging is required regarding
zeotropic refrigerant.
Refrigerant Charging
Vacuum Pump ■ ■
○
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.
Vacuum Pumping
Adapter for
Vacuum Pump
(Check Valve)
※●
★
Manifold Valve
● ★
○
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.
Vacuum Pumping,
Vacuum Holding,
Refrigerant Charging and
Check of Pressures
Charging Hose ● ★
Charging Cylinder
▼ ▼
* Use the weight scale. -
Weight Scale
■ ■
-
Measuring Instrument for
Refrigerant Charging
Refrigerant Gas
Leakage Detector
※● ★
* Use a detector designed for each refrigerant as
detecting method is different.
Gas Leakage Check
※
: Interchangeability with R407C.
5