-
20
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'11 • KX-T-166
②
Flowchart of the confirmation of reusability of existing pipes
Judge if existing pipes are reusable or not according to the following flowchart.
Start
Are outdoor units and indoor units con
-
nected to existing pipes for reuse?
Are olds units MHI products?
Yes
No
Is any of followings used for the refrig
-
erating machine oil on old unit?
Suniso, MS, Barrel Freeze, HAB
Freol, ether oil, ester oil
Co
nsu
lt u
s to
co
nfi
rm
if th
ey c
an b
e u
sed
or
not.
Usable
Not
usable
Does gas leak from existing pipes for
reuse? (Check if refrigerant was re
-
charged frequently.)
Is there any corrosion, damage or dent
on existing pipes for reuse?
Are branch pipes and header on the existing
pipeline for reuse supplied from Mitsubishi?
*Any special parts like a branch pipe with
orifice, or other, cannot be used, even if they
are supplied from MHI.
Are the length, diameter and wall
thickness of existing pipes for reuse
and difference of elevation between
units within the ranges of our specifica
-
tion?
Check pipe support hardware for loose
-
ness.
Is there any branch pipe which is not
connected to indoor unit?
Check the insulator on existing pipes to
be reused for peeling or deterioration.
(Both gas and liquid pipes need insula
-
tion.)
Consult us to confirm if they can be
used or not.
Remove the branch pipe.
Repair defective sections.
Repair defective sections.
Not usable Unable
to replace
Usable – Replace with MHI products.
Unable to repair
Repair
Test existing pipes for air tightness
at site.
Poor air tightness
Good air
tightness
Unable to remove
Remove
Loosened
Tightened
firmly
Repair defective sections.
When existing unit is:
・
Operable →
Pipe washing method by cooling operation of
existing unit.
・
Not operable →
Pipe washing method by re-fresh kit Existing
pipes can be reused by the above methods.
Existing pipes cannot be reused.
Use new pipes.
Select the standard specification
for indoor units.
Repair
No
No
Yes
Yes
No
Yes
Yes
No
Yes
No
No
No
No
Yes
Yes
Yes
Unable to repair
Repair
