Hitachi Set Free mini-HNRQ1 Series Installation & Maintenance Manual page 9

■
:
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
Lubricating
Oil (For Flare
Surface)
Refrigerant
Cylinder
Vacuum Pump
Adapter for
Vacuum Pump
(Check Valve)
Manifold Valve
Vacuum
Drying
Refrigerant
Charging Hose
Charge
Charging
Cylinder
Weight Scale
Refrigerant
Gas Leakage
Detector
※Interchangeability with R407C.
●
★
Interchangeability
with R22 Reason of Non-Interchangeability and Attention
(○: Strictly Required)
R410A R407C
■ ■
*The flaring tools for R107C 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 the
●
■
same.
*For 6.35mm D., 9.52mm 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
types of refrigerant oil. (If used, 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)
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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