MLCAC-UTSM-2011-02
Vacuum Dry and Leakage Checking
Installation
51
2. Vacuum Dry and Leakage Checking
1) Vacuum Dry: use vacuum pump to change the moisture (liquid) into steam (gas) in the pipe and discharge it out of the pipe to make the
pipe dry. Under one atmospheric pressure, the boiling point of water(steam temperature) is 100
. Use vacuum pump to make the
℃
pressure in the pipe near vacuum state, the boiling point of water falls relatively. When it falls under outdoor temperature, the moisture in
the pipe will be vaporized.
N ec es sa ry
v ac uum
de gree
2) Vacuum dry procedure
There are two methods of vacuum dry due to different construction environment: common vacuum dry, special vacuum dry.
①
. Common vacuum dry procedure
Vacuum dry (for the first time)---connect the all-purpose detector to the inlet of liquid pipe and gas pipe, and run the vacuum pump more
than two hours (the vacuum pump should be below -755mmHg)
If the pump can’t achieve below -755mmHg after pumping 2 hours, moisture or leakage point will still exist in the pipe. At this time, it
should be pumped 1 hour more.
If the pump can’t achieve -755mmHg after pumping 3 hours, please check if there are some leakage points.
Vacuum placement test: place 1 hour when it achieves -755mmHg, pass if the vacuum watch shows no rising. If it rises, it shows there’s
moisture or leakage point.
Vacuuming from liquid pipe and gas pipe at the same time.
Sketch map of common vacuum dry procedure.
Summary of Contents for PAC247C-I
Page 5: ......
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Page 15: ...MLCAC UTSM 2011 02 Wiring Diagrams Four way Cassette 13 4 Wiring Diagrams PAC247C I PAC367C I ...
Page 16: ...Wiring Diagrams MLCAC UTSM 2011 02 14 Four way Cassette PAC487C I ...
Page 25: ...MLCAC UTSM 2011 02 Service Space Ceiling Floor Type 23 3 Service Space ...
Page 26: ...Wiring Diagrams MLCAC UTSM 2011 02 24 Ceiling Floor Type 4 Wiring Diagrams PAC366FC I ...
Page 27: ...MLCAC UTSM 2011 02 Wiring Diagrams Ceiling Floor Type 25 PAC486FC I PAC606FC I ...
Page 35: ...MLCAC UTSM 2011 02 Features Outdoor Units 33 2 Service Space ...
Page 37: ...MLCAC UTSM 2011 02 Features Outdoor Units 35 4 Wiring Diagrams PAC247C O ...
Page 38: ...Features MLCAC UTSM 2011 02 36 Outdoor Units PAC367C O PAC366FC O ...
Page 39: ...MLCAC UTSM 2011 02 Features Outdoor Units 37 PAC487C O PAC486FC O ...
Page 40: ...Features MLCAC UTSM 2011 02 38 Outdoor Units PAC606FC O ...
