73
Structure
○: Interchangeable with current R22 :■ Only for Refrigerant R410A (not interchangeable with R22)
× : Prohibited ●: Only for Refrigerant R407C (not interchangeable with R22)
Measuring Instrument and
Tool
Interchangeability
with R22
Reason of Non-Interchangeability and Attention
(
★
: Strictly Required)
Application
R407C R410A
Refrige-
rant Pipe
Pipe Cutter
Chamfering
Reamer
○ ○ —— Cutting Pipe Removing Burrs
Flaring Tool ○ ○■ * R410A requires high pressure resistance piping and
larger aring. In case of material 1/2H, aring is not
available.(The aring tools for R410A are applicable to
R407C)
Flaring for Tubes
Extrusion
－
Adjustment Gauge
- ■
Dimensional Control of Tube
after Flaring
Pipe Bender ○ ○
* In case of material 1/2H, bending is not available.
Use elbow for bend and braze.
Bending
Expanding Tool ○ ○
* In case of material 1/2H, expanding of tube is not
available. Use joint for connecting tube.
Expanding Tubes
Torque Wrench ○
■
* For Φ1/2in., Φ5/8in. of R410A, spanner size is up to
5/64in.
Connection of Flare Nut
○
* For Φ1/4in.
，
Φ3/8.
,
Φ3/4in., spanner size is the
same.
Brazing Tool ○ ○ * Perform brazing work properly Brazing for Tubes
Nitrogen Gas ○ ○
* Strict control against contamination (Blow nitrogen
during brazing.)
Prevention from Oxidation
during Brazing Air-tight test
Lubrication Oil (for
Flare Surface)
● ■
* Use a synthetic oil which is equivalent to the oil used
in the refrigerant cycle.
* Synthetic oil absorbs moisture quickly.
Applying Oil to the Flared
Surface
Refrige-
rant
Charge
Vacuum
Drying
Refrigerant
Cylinder
● ■
* Check the cylinder for the corresponding refrigerant.
★
Liquid refrigerant charging is required regarding
zeotropic refrigerant.
Refrigerant Charging
Vacuum Pump ○ ○
★
The current pumps are applicable. However, it is
required to mount a vacuum pump adapter which can
prevent reverse ow when a vacuum pump stops,
resulting in no reverse oil ow.
Vacuum Pumping
Adapter for
Vacuum
Pump Reverse
Flow prevention
●
※
■
Interchangeable
with R410A
Control Valve ● ■ * No interchangeability is available due to higher
pressures when compared with R22. Connection
diameter is dierent: R410A: UNFl/2, R407C: UNF7/16
★
Do not use old ones to the dierent refrigerant.
Otherwise,
mineral oil will ow into the cycle and cause sludges,
resulting in clogging or compressor failure.
Vacuum Pumping, Vacuum
Holding, Refrigerant Charg-
ing and Check of Pressures
Charging Hose ● ■
Charging Cylinder × × * Use the weight scale when charging Refrigerant Charging
Weight Scale ○ ○ —— Measure refrigerant quantity
Refrigerant Gas
Leakage Detector
●
※
■
* The current gas leakage detector (R22) is not
applicable due to dierent detecting method.
Refrigerant Charging Gas
Leakage Check
Interchangeable
with R410A
※
Interchangeable with R407C
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