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18
ENGLISH
Indoor unit
Slave 2 outside unit Slave 1 outside unit Master outside unit
Liquid side
Gas side
Liquide pipe
Gas pipe
Liquide pipe
Gas pipe
Liquide pipe
Gas pipe
Close
Close
Close
Close
Close
Close
Nitrogen gas
cylinder
Scale
Use a graviometer. (One that can measure
down to 0.1kg(0.22lbs)). If you are unable
to prepare such a high-precision
gravimeter you may use a charge cylinder.
Vacuum pump
Indoor unit
Slave 2 outside unit Slave 1 outside unit Master outside unit
Liquid side
Gas side
Close
Liquide pipe
Gas pipe
Liquide pipe
Gas pipe
Liquide pipe
Gas pipe
Close
Close
Close
Close
Close
WARNING
Use a vacuum pump or Inert(nitrogen) gas when doing leakage test
or air purge. Do not compress air or Oxygen and do not use Flamma-
ble gases. Otherwise, it may cause fire or explosion.
- There is the risk of death, injury, fire or explosion.
!
[Unit:mm(inch)]
Leak test
Leak test should be made by pressurizing nitrogen gas to 3.8
MPa(551.1psi). If the pressure does not drop for 24 hours, the system
passes the test. If the pressure drops, check where the nitrogen leaks.
For the test method, refer to the following figure. (Make a test with
the service valves closed. Be also sure to pressurize liquid pipe, gas
pipe and high/low pressure common pipe)
The test result can be judged good if the pressure has not be reduced
after leaving for about one day after completion of nitrogen gas pres-
surization.
Leak Test and Vacuum drying
Header
Models Gas pipe Liquid pipe
4 branch
ARBL054
360(14-5/32)
120(4-23/32)
ID15.88(5/8)
ID12.7(1/2)
ID12.7(1/2)
ID15.88(5/8)
ID15.88(5/8)
ID19.05(3/4)
150
(5-29/32)
ID15.88(5/8)
ID12.7(1/2)
120
(4-23/32)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
120(4-23/32)
360(14-5/32)
ID9.52(3/8)
ID9.52(3/8)
ID6.35(1/4)
ID6.35(1/4)
ID9.52(3/8)
ID12.7(1/2)
150
(5-29/32)
ID15.88(5/8)
ID12.7(1/2)
120
(4-23/32)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
7 branch
ARBL057
540(21-1/4)
150
(5-29/32)
ID15.88(5/8)
ID12.7(1/2)
120
(4-23/32)
120(4-23/32)
ID15.88(5/8)
ID12.7(1/2)
ID15.88(5/8)
ID12.7(1/2)
ID15.88(5/8)
ID19.05(3/4)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
540(21-1/4)
150
(5-29/32)
ID15.88(5/8)
ID12.7(1/2)
120
(4-23/32)
120(4-23/32)
ID6.35(1/4)
ID9.52(3/8)
ID9.52(3/8)
ID12.7(1/2)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
4 branch
ARBL104
150
(5-29/32)
400(15-23/32)
160(6-5/16)
ID15.88(5/8)ID15.88(5/8)
ID12.7(1/2)ID12.7(1/2)
ID15.88(5/8)
ID12.7(1/2)
ID19.05(3/4)
ID15.88(5/8)
ID22.2(7/8)
ID28.58(1-1/8)
ID25.4(1)
120
(4-23/32)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
ID15.88(5/8)
ID12.7(1/2)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
150
(5-29/32)
120(4-23/32)
120
(4-23/32)
360(14-5/32)
ID9.52(3/8)
ID9.52(3/8)
ID6.35(1/4)
ID6.35(1/4)
ID9.52(3/8)
ID12.7(1/2)
7 branch
ARBL107
ID15.88(5/8)
ID12.7(1/2)
120
(4-23/32)
160(6-5/16)
580(22-27/32)
ID19.05(3/4)
ID15.88(5/8)
ID15.88(5/8)ID15.88(5/8)
ID12.7(1/2)ID12.7(1/2)
ID15.88(5/8)
ID12.7(1/2)
ID22.2(7/8)
ID28.58(1-1/8)
ID25.4(1)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
150
(5-29/32)
ID15.88(5/8)
ID12.7(1/2)
120
(4-23/32)
ID15.88(5/8)
ID12.7(1/2)
700(27-9/16)
120(4-23/32)
ID6.35(1/4)
ID9.52(3/8)
ID9.52(3/8)ID9.52(3/8)
ID6.35(1/4)ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
150
(5-29/32)
10 branch
ARBL1010
ID15.88(5/8)
ID12.7(1/2)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
120
(4-23/32)
160(6-5/16)
760(29-28/32)
ID19.05(3/4)
ID15.88(5/8)
ID22.2(7/8)
ID28.58(1-1/8)
ID25.4(1)
150
(5-29/32)
ID15.88(5/8)
ID12.7(1/2)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
120
(4-23/32)
160(6-5/16)
760(29-28/32)
ID19.05(3/4)
ID15.88(5/8)
ID22.2(7/8)
ID28.58(1-1/8)
ID25.4(1)
150
(5-29/32)
10 branch
ARBL2010
ID15.88(5/8)
ID12.7(1/2)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
120
(4-23/32)
182(7-5/32)
775(30-17/32)
ID19.05(3/4)
ID15.88(5/8)
ID15.88(5/8)
ID12.7(1/2)
ID28.58(1-1/8)
ID31.8(1-1/4)
ID34.9(1-3/8)
150
(5-29/32)
ID15.88(5/8)
ID12.7(1/2)
120
(4-23/32)
ID15.88(5/8)
ID12.7(1/2)
ID9.52(3/8)
ID6.35(1/4)
107(4-7/32)
60*9=540(21-1/2)
700(27-9/16)
ID6.35(1/4)
ID9.52(3/8)
ID19.05(3/4)
ID15.88(5/8)
ID9.52(3/8)
ID6.35(1/4)
ID9.52(3/8)
ID6.35(1/4)
150
(5-29/32)
WARNING
Use a vacuum pump or Inert(nitrogen) gas when doing leakage
test or air purge. Do not compress air or Oxygen and do not use
Flammable gases. Otherwise, it may cause fire or explosion.
- There is the risk of death, injury, fire or explosion.
!
NOTE
!
If the ambient temperature differs between the time when pressure is applied
and when the pressure drop is checked, apply the following correction factor
There is a pressure change of approximately 0.01Mpa(1.5psi) for each 33.8°F
of temperature difference.
Correction= (Temp. at the time of pressurization – Temp. at the time of check)
X 0.1
For example: Temperature at the time of pressurization
3.8MPa(551psi) is 80.6°F
24 hour later: 3.73MPa(541psi), 68°F
In this case the pressure drop of 0.07MPa(10psi) is
because of temperature drop
And hence there is no leakage in pipe occurred.
CAUTION
To prevent the nitrogen from entering the refrigeration system in
the liquid state, the top of the cylinder must be at higher position
than the bottom when you pressurize the system.
Usually the cylinder is used in a vertical standing position.
!
Vacuum
Vacuum drying should be made from the service port provided on the outdoor
unit’s service valve to the vacuum pump commonly used for liquid pipe, gas pipe
and high/low pressure common pipe. (Make Vacuum from liquid pipe, gas pipe and
high/low pressure common pipe with the service valve closed.)
* Never perform air purging using refrigerant.
• Vacuum drying: Use a vacuum pump that can evacuate to -100.7kPa (-
14.6psi, 5 Torr, -755mmHg).
- Evacuate the system from the liquid and gas pipes with a vacuum pump
for over 2 hrs and bring the system to -100.7kPa(-14.6psi). After maintain-
ing system under that condition for over 1 hr, confirm the vacuum gauge
rises. The system may contain moisture or leak.
- Following should be executed if there is a possibility of moisture remain-
ing inside the pipe.
(Rainwater may enter the pipe during work in the rainy season or over a
long period of time)
After evacuating the system for 2 hrs, give pressure to the system to
0.05MPa(7.3psi) (vacuum break) with nitrogen gas and then evacuate it
again with the vacuum pump for 1hr to -100.7kPa(-14.6psi)(vacuum dry-
ing). If the system cannot be evacuated to -100.7kPa(-14.6psi) within 2
hrs, repeat the steps of vacuum break and its drying. Finally, check if the
vacuum gauge does not rise or not, after maintaining the system in vac-
uum for 1 hr.
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