Pioneer YH024GHFI18RT2 Installation Manual page 10

Installation Instructions
When installing piping through
the wall, secure a cap at the
end of the pipe.
Incorrect
Correct
Hole Hole
Attach a cap
or vinyl tape.
3.Preparation 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. Point the end
of the copper pipe downward to prevent burrs from dropping into the pipe.
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.
(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
· 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
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
C A U T I O N
！
危 险
Do not place the pipe
directly on the ground.
Correct Incorrect
Attach a cap
or vinyl tape.
.
.
.
.
release nitrogen gas.
,
Correct Incorrect
Rain water can
enter.
Attach a cap
or vinyl bag with
rubber band.
).
or brazed
,
.
7
Baffle
Clamp(field-supplied) Insulation (field-supplied)
Piping Insulation Procedure
Procedure
Completion Applying
of Ref. Nitrogen
Piping Gas
Repairing
of Leakage
Part
Air-tight Procedure
Welding Torch
Wet Cloth
Refrigerant Pipe
(field-supplied)
Insulation
( field-supplied )
Check for
Pressure Pass
Decrease