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4-10 Gas tightness test
1) When the indoor tube is connected, the high pressure tube can be
welded to the surface joint, as shown in the figure below.
2) Weld the low pressure tube to the surface joint, as shown is the figure
below.
3) Firstly, exhaust the system air from the valve core of the liquid-side
shut-off valve and the gas-side shut-off valve by a vacuum pump until the
gauge pressure showing -1kg / cm2.
4) Then shut down the vacuum pump, and charge 40kgf / cm2 nitrogen
from the valve core of the shut-off valve on both the gas and liquid sides,
and maintain the pressure for 24 hours.
High pressure tube joint
Indoor unit
Fig.4.4 Gas tightness test
!
NOTICE
1. Gas tightness test is performed by pressurized nitrogen gas (4.0MPa,
i.e. 40kgf/cm ).
2
2. Gas tightness test cannot be performed by oxygen gas, inflammable
gas or toxic gas.
3. Gas tightness test must be performed by injecting the high pressure
nitrogen gas from the high pressure side and low pressure side at the
same time, or the indoor electronic expansion valve core may be
damaged by the excessively high pressure at one side.
4. The low pressure valve must be protected by piece of wet cloth during
welding.
4-11 Vacuumizing by a vacuum pump
1) The vacuum degree of the vacuum pump is -0.1MPa below and the
air flow rate is 40L/min above.
2) Vacuumization for the outdoor unit is unnecessary, and it is forbidden
to open the check valves at the gas side and liquid side of the outdoor
unit.
3) Make sure the vacuum pump can reach -0.1MPa below within 2
hours, and if it fails to reach -0.1MPa below after 3 hours, it means some
water or air has mixed inside, and the pump and pipeline system must be
inspected.
Connect the vacuum pump
Run the vacuum pump (>2h)
Keep running the vacuum pump
for 20~60min after the full vacuum
degree has reached -0.1MPa
Stop the vacuum pump
Keep vacuum (>1h)
!
NOTICE
1. Tools and measuring apparatus for different refrigerants or directly
contacting the refrigerant cannot be mixed for using.
2. Refrigerant gas cannot be used for air impelling.
3. If the vacuum degree cannot reach -0.1MPa, please check if there is
some leakage, and if not, please make the vacuum further run for 1~2h.
4-12 Refrigerant refilling volume
The volume of refrigerant to be refilled (R410A) is calculated as per the
diameter and length of tube at the liquid side of the outdoor and indoor
units.
Outdoor unit
Nitrogen inlet
Nitrogen inlet
Low pressure tube joint
Low presser gas tube
High pressure liquid tube
1. Close the pressure gauge valve.
2. Disconnect the pressure gauge
from the vacuum pump.
3. Shut down the vacuum pump
Fig.4-5 Vacuumizing
Refrigerant refilling volume
Tab.4.9
Diameter of tube at
the liquid side(mm)
Ф6.35
Ф9.5
Ф12.7
Ф15.9
Ф19.1
Ф22.2
Ф25.4
Ф28.6
!
NOTICE
1.Refrigerant R410A must be weighed for refilling by an electronic
weigher in the liquid mode.
4-13 Key points for the installation of outdoor tubes
1) Tubes for outdoor units must be horizontally arranged (Fig.4.6 and
Fig.4.7), and no sagging is permitted in the middle section, as shown in
Fig.4.8.
2) Tubes for outdoor units cannot be higher than the tube interface of
each unit, as shown in Fig.4.9.
3) The manifold shall be installed as horizontally as possible, and the
angle error shall be controlled within 10 , as any fault may happen if it is
not correctly installed, as shown in Fig.4.10.
11
Refrigerant to be refilled for
every 1m of tube length(kg)
0.022
0.057
0.110
0.160
0.210
0.360
0.520
0.680
°
Correct mode
Fig.4.6 Mode 1
Correct mode
Fig.4.7 Mode 2
Incorrect mode
Fig.4.8 Mode 3
Incorrect mode
Fig.4.9 Mode 4
V.2
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