7
3
.
Pr
eparation
of Refrigerant Piping
(1)
Pipe Cutting
Cut the copper pipe
properly
using pipe cutter.
(2)
Burr Removal
Completely remove all burrs from the cut cross section of the pipe. P
oint
the end
of
the copper pipe downward to prevent burrs from dropping into the pipe.
危
险
！
C A U T I O N
When installing piping through
the wall, secure a cap at the
end of the pipe
.
Correct
Correct
Incorrect
Incorrect
Correct
Incorrect
Hole
Hole
Attach
a
cap
or
vinyl
tape
.
Attach a cap
or vinyl tape
.
Attach a cap
or vinyl bag with
rubber band
.
Do not place the pipe
directly on the ground
.
Rain
water
can
enter
.
4. Piping Connection
(1) Confirm that the valves are closed
.
(2) Connect the indoor unit and the outdoor unit with field
-
supplied
refrigerant pipes
.
The refrigerant piping should be brazed with a
phosphorous-copper alloy material such as Silfos-5 or equivalent.
Precautions and steps during brazing service valve include:
a. Remove the caps from both the liquid and gas service valve
service ports at the outdoor unit
.
b. Braze the liquid piping and gas piping to
valves at the outdoor
unit.
Precautions should be taken to prevent heat damage to service
valve by wrapping a wet cloth around it
.
Also, a baffle can be set to protect all painted surfaces and
insulation during brazing.
c. After brazing, cool joint using the wet rag
.
Installation
I
nstructions
Welding Torch
Baffle
Wet Cloth
Piping Insulation Procedure
Insulation
(
)
field-supplied
(3) After finishing connection of the refrigerant pipes, keep it warm using
the insulation material as depicted in the figure on the right.
·
For the outdoor unit side, insulate every piping end, including valves.
·
Cover piping joints with pipe
-
shielding material.
·
Using piping tape, apply tape starting from entry points of outdoor unit.
-
Fix the end of piping tape with adhesive tape.
-
When piping has to be arranged through above ceiling, closet or area
where temperature and humidity are high, wind additional commercially
sold insulation, for prevention of condensation.
5. Airtight Test
Clamp(field-supplied) Insulation (field-supplied)
Refrigerant Pipe
(field-supplied)
Air
-
tight
P
rocedure
Completion
of
Ref
.
Piping
Repairing
of
Leakage
Part
Check
for
Pressure
Decrease
Applying
Nitrogen
Gas
Pass
Procedure
·
Use Nitrogen.
Connect the gauge manifold using charging hoses with a
nitrogen cylinder to the check joints of the liquid line and the gas
line stop valves
.
·
Perform the air
-
tight test
.
Don
'
t
open
the gas line stop valves
.
Apply nitrogen gas pressure of 550 PSIG (3.8 MPa
).
Check
for
any
gas
leakage
at
the
flare
nut connections
,
or brazed
parts by using a gas leak detector or foaming agent
.
·
If gas pressure doesn’t decrease and all checks have passed:
After
the
air
tight
test
,
release
nitrogen gas.
