18
ENGLISH
- Ensure that the branch pipes are attached vertically.
Vertical Distribution
The others
Leak test
Leak test should be made by pressurizing nitrogen gas to 3.8
MPa(38.7kgf/cm
2
). If the pressure does not drop for 24 hours, the sys-
tem 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 pressure gas 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
Indoor unit
Nitrogen gas
cylinder
Slave 1 outdoor unit Master outdoor unit
Liquide pipe
Gas pipe
Liquide pipe
Gas pipe
Liquid side
Gas side
Close
Close
Close
Close
When inserting nitrogen
gas of high pressure, it
must be used with reg-
ulator.
This function is used for creating vacuum in the system after compres-
sor replacement, ODU parts replacement or IDU addition/replacement.
Vacuum mode setting method
SW01C (Ɨ: Confirm /
Automatic Addressing)
SW02C (ȭ: backward)
SW04C (X : cancel)
DIP-SW01
7-Segment
SW01D (reset)
SW03C (ȯ: forward)
Vacuum mode off method
CAUTION
ODU operation stops during vacuum mode. Compressor can't
operate.
Master unit PCB DIP switch on : No.5
Select the mode using ‘▶’, ‘◀’ Button :
“SVC” Push the ‘●’ button
Select the Function using ‘▶’, ‘◀’ Button :
“Se3” Push the ‘●’ button
Start the vacuum mode : “VACC”
ODU Valve open
ODU EEV open
IDU EEV open
HR unit valve open, SC EEV open
Dip switch off and push the reset button on Master unit PCB
!
Vacuum Mode
Slave
Master
Slave
Master
1st
1st
1st
Main pipe
Distribution
2nd
2nd
3rd
3rd
Main pipe
Distribution
Slave
Master
1st
3rd
3rd main pipe distribution
2nd
Horizontal Distribution
Distribution Method
1,MFL67221438,영영 2018. 10. 4. 영영 11:29 Page 18
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