Hitachi RAS-8.0HNBRMQ1 - Page 10

3
INSTALLATION
■: 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 aring tools for R407C are applicable to R22.
*
If using aring tube, make dimension of tube larger
for R410A.
*
In case of hard temper pipe, aring 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 the oil
used in the refrigeration cycle.
*
Synthetic oil absorbs moisture quickly.
Applying Oil to the
Flared Surface
Vacuum
Drying
;
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 pessure is different.Do
not share manifold and charging hoses with other
refrigerant type to prevent mixing of different types
of refrigerant oil. (If use, it may cause cycle choking
or compressor failure.)
Standard of Connection Screw: 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 ■ ■ ─
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.