Toshiba RAS-16TAVG-EE, Installation Manual

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APPENDIX
W
ork instructions
The existing R22 and R410A
piping can be reused for
inverter R32 product installations.
W
ARNING
Confirming the existence of scratches or dents on the existing pipes and confirming the reliability of the pipe strength are conventionally referred to the local site. If the specified conditions can be cleared, it is possible to update existing R22 and R410A
pipes
to those for R32 models.
Basic conditions needed to reuse existing pipes Check and observe the presence of three conditions in the refrigerant piping works. 1.
Dry
(There is no moisture inside of the pipes.)
2.
Clean
(There is no dust inside of the pipes.)
3.
Tight
(There are no refrigerant leaks.)
Restrictions for use of existing pipes
In the following cases, the existing pipes should not be reused as they are. Clean the existing pipes or exchange them with new pipes.
1. When a scratch or dent is heavy
, be sure to use
new pipes for the refrigerant piping works.
2. When the existing pipe thickness is thinner than
the specified “Pipe diameter and thickness,” be sure to use new pipes for the refrigerant piping works. •
The operating pressure of R32 is high (1.6 times that of R22). If there is a scratch or dent on the pipe or a thinner pipe is used, the pressure strength may be inadequate, which may cause the pipe to break in the worst case.
* Pipe diameter and thickness (mm)
Pipe outer diameter
Ø6.4
Ø9.5
Ø12.7
Thickness
R32, R410A
0.8
0.8
0.8
R22
3. When the outdoor unit was left with the pipes
disconnected, or
the
gas leaked from
the
pipes and
the pipes were not repaired and refilled. •
There is the possibility of rain water or air
,
including moisture, entering the pipe.
4. When refrigerant cannot be recovered using a
refrigerant recovery unit. •
There is the possibility that a large quantity of dirty oil or moisture remains inside the pipes.
5. When a commercially available dryer is attached to
the existing pipes. •
There is the possibility that copper green rust has been generated.
6. When the existing air conditioner is removed after
refrigerant has been recovered. Check if the oil is judged to be clearly different from normal oil. •
The refrigerator oil is copper rust green in color: There is the possibility that moisture has mixed with the oil and rust has been generated inside the pipe.
•
There is discolored oil, a large quantity of resi
-
due, or a bad smell.
•
A large quantity of shiny metal dust or other wear residue can be seen in the refrigerant oil.
7. When the air conditioner has a history of the com
-
pressor failing and being replaced. • When discolored oil, a large quantity of residue,
shiny metal dust, or other wear residue or mixture of foreign matter is observed, trouble will occur
.
8. When temporary installation and removal of the air
conditioner are repeated such as when leased etc.
9. If the type of refrigerator oil of the existing air
conditioner is other than the following oil (Mineral oil), Suniso, Freol-S, MS (Synthetic oil), alkyl benzene (HAB, Barrel-freeze), ester series, PVE only of ether series. •
The winding-insulation of the compressor may deteriorate.
NOTE
The above descriptions are results have been confirmed by our company and represent our views on our air conditioners, but do not guarantee the use of the existing pipes of air conditioners that have adopted R32 in other companies.
Curing of pipes
When removing and opening the indoor or outdoor unit for a long time, cure the pipes as follows: • Otherwise rust may be generated when moisture or
foreign
matter due to condensation
enters the pipes.
•
The rust cannot be removed by cleaning, and new pipes are necessary
.
Placement location
Term
Curing manner
Outdoors
1 month or more
Pinching
Less than 1 month
Pinching or taping
Indoors
Every time
Are there scratches or dents on the existing pipes?
Is it possible to operate the existing air conditioner?
W
as largely discolored oil or a large quantity
of remains discharged? (When the oil deteriorates,
the color of the oil changes to a muddy
or black color
.)
•
After the existing air conditioner is operated in cooling mode for approx. 30 minutes or longer
,* recover the
refrigerant.
• For cleaning the pipes and recovering oil
• Refrigerant recovery: Pump down method
• Remove the existing air conditioner from the piping and
carry out flushing (nitrogen pressure 0.5 MPa) to remove any remains inside of the pipe.
Note:
In case of twin pipes, also be sure to flush the
branching pipe.
Connect the indoor / outdoor units to the existing pipe. • Use a flare nut attached to the main unit for the indoor
/ outdoor units. (Do not use the flare nut of the existing pipe.)
• Re-machine the flare machining size to size for R32. • (Airtight test), V
acuum dry
, Refrigerant charge, Gas leak
check
Existing pipes: Cannot be used. • Use new pipes.
Clean the pipes or use new pipes.
(If there is discharge of remains, it is judged that a large quantity of remains are present.)
Test run
YES YES
YES
NO
NO NO
Nitrogen gas pressure 0.5 MPa
Piping necessary to change the flare nut / machining
size due to pipe compression
1) Flare nut width: H
H
(mm)
Copper pipe outer diameter
Ø6.4
Ø9.5
Ø12.7
For R32, R410A
17
22
26
For R22
Same as above
24
2) Flare machining size:
A
A
(mm)
Copper pipe outer diameter
Ø6.4
Ø9.5
Ø12.7
For R32, R410A
9.1
13.2
16.6
For R22
9.0
13.0
16.2
Becomes a little larger for R32
Do not apply refrigerator oil to the
flare surface.
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