Hisense Hi-Therma Serie Manual De Instalación Y Mantenimiento página 26

REFRIGERANT PIPING WORK
8.4 AIR-TIGHTNESS TEST
1 Connect the manifold gauge using charging hoses with
a nitrogen cylinder to the check joint of the gas stop valve.
Apply nitrogen gas pressure of 4.15MPa.
2 Check for any gas leakage at the flare nut connections,
or brazed parts by gas leak detector or foaming agent.
3 After the air-tightness test, release nitrogen gas.
Procedure
Completion Applying
of Ref. Nitrogen
Piping Gas
?
N O T E
•
Do not open the stop valves during the air-tightness test.
8.5 VACUUM PUMPING AND REFRIGERANT
CHARGE
1 Connect the manifold gauge using charging hoses with
a vacuum pump to the check joint of the gas stop valve.
2 Continue vacuum pumping work until the pressure reaches
-0.1MPa or lower for one to two hours.
Outdoor unit
Manifold
gauge
Charging hose
(for R32)
Vacuum
pump
3 After vacuum pumping work, stop the manifold gauge's
valve, stop the vacuum pump and leave it for one
hour. Check to ensure that the pressure in the manifold
gauge does not increase.
4 Fully open the gas stop valve and liquid stop valve.
5 Add refrigerant according to the piping diameter and
piping length in the field connecting.
Check of
Pressure Pass
Decrease
Repairing
of Leakage
Part
Indoor unit
Nitrogen cylinder
(for Nitrogen purging during
brazing and air-tightness test)
Refrigerant cylinder (R32)
Weighing scale
6 Check for any gas leakage by gas leak detector or
foaming agent. Use the foaming agent which does not
generate NH3 by chemical reaction.
NO T E
When the spindle cap for stop valve is removed, the gas
accumulated
If vacuum degree of -0.1MPa is not available, it may be
because
8.6 REFRIGERANT CHARGING QUANTITY
In case of the total piping length(L) is more than the charge-
less piping length, the additional refrigerant quantity should be
charged according to the table below:
Capacity
Factory Charge
Charge-less piping length(L 0 )
Additional charge for piping
length (L-L 0 )
Minimum piping length(L min )
Maximum piping length(L max )
Maximum total refrigerant
charge(*)
Maximum height difference between outdoor unit and
indoor unit
Outdoor unit is higher than
indoor unit
Indoor unit is higher than
outdoor unit
*
In case of total refrigerant amount ≥1.84 kg, there are an
additional minimum floor area requirements(more details in
the following section).
!
C A U T I O N
• When charging refrigerant, accurately measure refrigerant to be
charged.
• Overcharging or undercharging of refrigerant can cause compressor
trouble.
15
60 80
44
(2.0HP) (2.5HP) (3.0HP)
kg
1.23 1.26
m
15
15
g/m
30
20
5
m
m
40 45
kg
2.16
1.73
m 30
m
20