Chariot Carriers Merci Installation Manual download pdf (Page 41)

– 40 –

80-EN79-EN

Appendix

Work instructions

The existing R22 and R407C piping can be reused for

our digital inverter R410A product installations.

WARNING

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 R407C pipes

to those for R410A 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 R410A is high (1.6

times that of R22 and R407C). 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)

 In case the pipe diameter is Ø12.7 mm or less and

the thickness is less than 0.7 mm, be sure to use

new pipes for the refrigerant piping works.

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 residue,

or a bad smell.

 A large quantity of shiny metal dust or other wear

residue can be se

en in the refrigerant oil.

7. When the air conditioner has a history of the

compressor 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 compres

sor 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 R410A 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.

Pipe outer diameter Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0

Thickness

R410A

0.8 0.8 0.8 1.0 1.0

R22

(R407C)

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?

Piping necessary to change the flare nut / machining

size due to pipe compression

1) Flare nut width: H

2) Flare machining size: A

Do not apply refrigerator oil to the flare surface.

(mm)

Copper

pipe outer

diameter

Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0

For

R410A

17 22 26 29 36

For R22

Same as

above

24 27

Same

above

(mm)

Copper

pipe outer

diameter

Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0

For

R410A

9.1 13.2 16.6 19.7 24.0

For R22 9.0 13.0 16.2 19.4 23.3

Becomes a little larger for R410A

YES

Is it possible to operate the existing air conditioner?

 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.

Was 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.)

Nitrogen gas pressure 0.5 MPa

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.)

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

R410A.

In case that a gas pipe Ø19 mm or bigger is used for

the outdoor unit of SM80 (3 HP): (Our R410A model 3

to 6 HP gas pipe size is Ø15.9 mm)

See page 14 “Existing piping”.

 (Airtight test), Vacuum dry, Refrigerant charge, Gas

leak check

Test run

1115150101_EN.indd 401115150101_EN.indd 40 8/24/13 9:40 AM8/24/13 9:40 AM

1 2 ... 36 37 38 39 40 41 42 43 44

Comments to this Manuals

No comments

Chariot Carriers Merci Installation Manual Page 41

Comments to this Manuals

Related products and manuals for Baby carriers Chariot Carriers Merci