Hisense AVWT-76FKFSHA Technical Handbook page 541

○ : Interchangeable current R22
X : Prohibited
Interchangeability
with
Measuring Instrument
and Tool
R407C
Pipe Cutter
Chamfering
Reamer
Flaring Tool
Allowance
Adjustment
Gauge
Pipe Bender
Refrige-
Expanding
rant
Tool
Pipe
Torque
Wrench
Brazing Tool
Nitrogen Gas
Lubrication Oil
(for Flare
Surface)
Refrigerant
Cylinder
Vacuum Pump
Adapter for
Vacuum
Interchangeability
PumpReverse
with R410A
flow prevention
Refrige-
rant
Control Valve
Charge
Charging
Vacuum
Hose
Drying
Charging
Cylinder
Weight Scale
Refrigerant
Gas Leakage
Interchangeability
Detector
with R410A
Interchangeable with R407C
R22
R410A
○
○
R410A requires high pressure resistance piping and
*
○ ○■
larger flaring process. In case of material 1/2H, flaring is
not applicable. (The flaring tools for R410A are
■ applicable to R407C)
In case of material 1/2H, bending is not applicable. Use elbow
*
○ ○
for bend and braze.
In case of material 1/2H, expanding of tube is not applicable.
*
○ ○
Use socket for connecting tube.
For Φ12.7, Φ15.88 of R410A, spanner size is up 2mm
■
*
○
○
For Φ6.35, Φ9.53, Φ19.05, spanner size is the same.
*
Perform brazing work（adjustable flame, heating
*
○ ○
method, feeding filler) properly
Strict Control against Contamination (Purge nitrogen during
*
brazing.)
○ ○
Use a synthetic oil which is equivalent to the oil used in the
*
refrigeration cycle.
●
■
Synthetic oil absorbs moisture quickly.
*
Check the cylinder for the corresponding refrigerant.
*
★ It is a must to charge liquid zeotropic refrigerant.
●
■
○ ○
★The current ones are applicable. However, it is required to
※■
●
mount a vacuum pump adapter which can prevent from reverse
flow when a vacuum pump stops.
● ■ The higher pressure compared with R22 accounts for
*
non-interchangeability. Connection diameter is different:
R410A: UNFl/2, R407C: UNF7/16
★Do not use old ones to the different refrigerant. If used, mineral
● ■
oil will flow into the cycle and cause sludges, resulting in
clogging or compressor failure.
Use the weight scale
*
×
○ ○
The current gas leakage detector (R22) is not applicable due
● ※■
*
to different detecting method.
■: only for Refrigerant R410A (No Interchangeability with R22)
● : only for Refrigerant R407C (No Interchangeability with R22)
Reason of Non-Interchangeability
and Attention (★: Strictly Required)
——
——
534
Use
Cutting Pipe
Removing Burrs
Flaring for Tubes
Dimensional Control for Ex-
truded Portion of Tube after
Flaring
Bending
Expanding Tubes
Connection of Flare Nut
Brazing for Tubes
Prevention from Oxidation
during Brazing Air-tight test
Applying Oil to the Flared
Surface
Refrigerant Charging
Vacuum Pumping
Vacuum Pumping, Vacuum
Holding, Refrigerant Charg-
ing and Check of Pressures
Refrigerant Charging
Measuring Instrument for
Refrigerant Charging Gas
Leakage Check