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8. PIPE INSTALLATION II
Fig. A Connection system
In case of connected 1
outdoor unit
Outdoor unit
Pressure gauge
Vacuum
pump
Scale
Pressure regulating valve
Nitrogen
Indoor
unit
Indoor
unit
In case of con-
nected many
outdoor units
Pressure regulating valve
Pressure gauge
Outdoor unit Outdoor unit
Nitrogen
Scale
Vacuum
pump
Indoor
unit
Indoor
unit
Fig. B Valve operation
3-way valve (liquid)
Charging cap
Valve
Cap
Close
Hexagon
wrench
Close
Open
Open
Spindle
Ball valve (gas)
Charging cap
Cap
Close
Usethecompressorfixtureremovedin
“3.6.Removingthecompressorfixture”
as a valve wrench.
Close
Close
Open
Open
Open
Spindle
Tightening torque
(Unit: N·m (kgf·cm)
Valve type Model Spindle Cap Charging cap
3-way valve
(liquid)
072/090/108/
126/144
10.0 ± 1.0
(100 ± 10)
30.0 ± 2.0
(300 ± 20)
10.0 to 16.0
(100 to 160)
162/180
12.0 ± 1.0
(120 ± 10)
32.5 ± 2.5
(325 ± 25)
Ball valve
(gas)
072/090/108/
126/144
1.47 or less
(15.0 or less)
22.5 ± 2.5
(225 ± 25)
16.0 ± 2.0
(160 ± 20)
162/180
8.1. Sealing test
CAUTION
Use only nitrogen gas.
Neveruserefrigerantgas,oxygen,inflammablegasorpoisonousgastopressurizethe
system.(Ifoxygenisused,thereisthedangerofanexplosion.)
Do not apply shock during sealing test.
It can rupture the pipes and cause serious injury.
Do not turn on the power unless all operations are complete.
Do not block the walls and the ceiling until the sealing test and the charging of the
refrigerant gas have been completed.
After connecting the pipes, perform a sealing test.
Recheck that the 3-way valve and ball valve are closed before performing a sealing test.
(Fig. B)
Pour nitrogen gas through both the liquid pipe and the gas pipe.
Pressurize nitrogen gas to 4.2 MPa to perform the sealing test.
Check all flare connection areas and brazed areas.
Then, check that the pressure has not decreased.
Compare the pressures after pressurizing and letting it stand for 24 hours, and check that
the pressure has not decreased.
* When the outdoor temperature changes 5 °C, the test pressure changes 0.05 MPa.
If the pressure has dropped, the pipe joints may be leaking.
If a leakage is found, immediately repair it and perform a sealing test again.
* Decrease the pressure of nitrogen gas before blazing
After completing the sealing test, release the nitrogen gas from both valves.
Release the nitrogen gas slowly.
8.2. Vacuum process
CAUTION
Do not turn on the power unless all operations are complete.
If the system is not evacuated sufficiently, its performance will drop.
Be sure to evacuate the refrigerant system using a vacuum pump.
The refrigerant pressure may sometimes not rise when a closed valve is opened after
the system is evacuated using a vacuum pump. This is caused by the closure of the
refrigerantsystemoftheoutdoorunitbytheelectronicexpansionvalve.Thiswillnot
affect the operation of the unit.
Use a clean gauge manifold and charging hose that were designed specifically for use
with R410A. Using the same vacuum equipment for different refrigerants may damage
the vacuum pump or the unit.
Do not purge the air with refrigerants, but use a vacuum pump to evacuate the system.
• If moisture might enter the piping, follow below. (i.e., if doing work during the rainy
season, if the actual work takes long enough that condensation may form on the
inside of the pipes, if rain might enter the pipes during work, etc.)
• After operating the vacuum pump for 2 hours, pressurize to 0.05 MPa (i.e., vacuum
breakdown) with nitrogen gas, then depressurize down to -100.7 kPa (-755 mmHg) for
an hour using the vacuum pump (vacuum process).
• If the pressure does not reach -100.7 kPa (-755 mmHg) even after depressurizing for
at least 2 hours, repeat the vacuum breakdown - vacuum process.
After vacuum process, maintain the vacuum for an hour and make sure the pressure
does not rise by monitoring with a vacuum gauge.
8.2.1 Evacuation procedure
(1) Remove the caps of the gas pipe and liquid pipe and check that the valves are
closed.
(2) Remove the charging cap.
(3) Connect a vacuum pump and a pressure gauge to a charging hose and connect it to
the charging port.
(4) Activate the vacuum pump and vacuum the indoor unit and connection piping until
the pressure gauge becomes -100.7kPa (-755mmHg).
Evacuate from both the gas pipe and the liquid pipe.
(5) Continue evacuating the system for 1 hour after the pressure gauge reads -100.7kPa
(-755mmHg).
(6) Remove the charging hose and reinstall the charging cap.
CAUTION
Do not turn on the power unless all operations are complete.
After evacuating the system, add refrigerant.
Do not charge the system with a refrigerant other than R410A.
Alwayskeeptothelimitonthetotalamountofrefrigerant.Exceedingthelimitonthe
total amount of refrigerant will lead to malfunction during charging of refrigerant.
Do not reuse recovered refrigerant.
Use an electronic scale to measure the charging amount of refrigerant.
Adding more refrigerant than the specified amount will cause a malfunction.
Charge refrigerant using the liquid pipe.
Adding refrigerant through the gas pipe will cause a malfunction.
Add refrigerant by charging the system with the refrigerant in the liquid state. If the re-
frigerant gas cylinder is equipped with a siphon, it is not necessary to place the cylinder
upright.
Check if the refrigerant gas cylinder has a siphon installed or not before filling. (There is
an indication “with siphon for filling liquid” on the cylinder.)
Filling method
for cylinder with
siphon
Liquid
Gas
R410A
Set the cylinder vertical and fill with
the liquid.
(Liquid can be filled without turning
bottom up with the siphon inside.)
Filling method for
other cylinders
Liquid
Gas
R410A
Turn bottom up and fill with liquid.
(Be careful to avoid turning over the
cylinder.)
BesuretousethespecialtoolsforR410Aforpressureresistanceandtoavoidmixing
of impure substances.
Iftheunitsarefurtherapartthanthemaximumpipelength,correctoperationcannotbe
guaranteed.
Make sure to back closing valve after refrigerant charging. Otherwise, the compressor
may fail.
Minimizerefrigerantreleasetotheair.ExcessivereleaseisprohibitedundertheFreon
Collection and Destruction Law.
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Productinformatie
| Merk | Fujitsu |
| Model | AJG072JATAH |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 5568 MB |
