3
2.2 The following is accessory parts of the outdoor unit. Please confirm it before installation.
Accessory
Q
’ty
Use Place
Use Method
Flange Combination
1
Use to connect gas
piping.
Please refer the piping work
on page 9.
Drain Connector
1
Base condensation
water exhaust.
Please refer the foundation
work on page 8.
Washer
1
Stop Gap Material
1
3. Before Installation
3.1 The R410A refrigerant pressure higher than R22 about 1.4 times, it is more susceptible to moisture, acid materials, oil
and other impurities influence. Because of the new refrigerant, refrigerant oil also will be changed. Therefore, when
installation, be careful not to water, impurities, the existing use of the refrigerant and refrigeration oil mixed in the cycle
system.
3.2 To avoid accidental mixing of different refrigerant or different refrigerant oil, the sizes of the charging connections have to
be changed. It necessary to prepare the following special R410A tools before performing the installation work.
The measuring machine or tool which will contact with the refrigerant, please use specially for the new
refrigerant.
Symbol Description
：
○
：
for new and old type refrigerant
■
：
only for R410A(not for R22)
●
：
only for R407C(not for R22)
※
：
for two type R410A and R407C.
Measuring Instrument and
Tool
Interchangeability
with R22
Reason of Non-Interchangeability and Attention
(only for new refrigerant)
(
◎
Strictly Required)
Use
R407C R410A
Refrigerant
Pipe
Pipe Cutter
○
○
Cutting Pipe
；
Removing Burrs
Flaring Tool
○
○■
‧
To ensure the high pressure of R410A, if using flaring
tube, make the dimension of tube larger for R410A. If
you continue to use existent products, shall be used with
the flaring tube adjustment gasket (1mm). Using the
1/2H pipe situation, can not be processed.
(R410A special flaring tool can be used directly in the
R407C)
Flaring for Tubes
Extrusion
Adjustment
Gauge
─
(
not use
)
■
Dimensional Control for
Extrusion Portion of Tube after
Flaring
Pipe Bender
○
○
‧
Using the 1/2H pipe situation, can not be processed.
Please use the elbow welding connection.
Bending
Expanding Tool
○
○
‧
Using the 1/2H pipe situation, can not be processed.
Please use the elbow welding connection.
Expanding Tubes
Torque Wrench
○
■
‧
R410A forΦ12.7
、
Φ15.88;spanner size is up 2mm;
existent products can not be used.
Connection of Flare Nut
○
‧
For Φ6.35
、
Φ9.53
、
Φ19.05; spanner size is the same.
Brazing Tool
○
○
‧
Perform correct brazing work.
Brazing for Tubes
Nitrogen Gas
○
○
‧
Strict control against contamination.
(Blow nitrogen during brazing)
Prevention from Oxidation
during Brazing
Lubrication
Oil(for Flare
Surface)
●
■
‧
Do not use R22 with mineral oil, and products must be
used the same synthetic oil.
‧
Synthetic oil absorbs moisture quickly, Therefore, to avoid
damp places.
Applying Oil to the Flared
Surface
Measuring Instrument and
Tool
Interchangeability
with R22
Reason of Non-Interchangeability and Attention
(only for new refrigerant)
(
◎
Strictly Required)
Use
R407C R410A
Vacuum
Drying
Refrigerant
Change
Refrigerant
Cylinder
●
(Brown)
■
(Pink)
‧
Check refrigerant cylinder color.
◎〈
Filled with the gas refrigerant is strictly prohibited
〉
Liquid refrigerant charging is required regarding
Non-azeotropic refrigerant.
Refrigerant Charging
Vacuum Pump
○
○
◎
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,
resulting in no reverse oil flow.
Vacuum Pumping
Adapter for
Vacuum Pump
(prevent from
reverse)
※●
■
The product of the design pressure is 4.15MpaG.
