Daikin RXYQ10PY1 [277/487] Air tight test and vacuum drying method

Daikin RXYQ22PY1 [277/487] Air tight test and vacuum drying method
ED34-645B Air Tight Test and Vacuum Drying
Installation of Outdoor Units 669
15
8.2 Air Tight Test and Vacuum Drying Method
After finished piping work, carry out air tight test and vacuum drying.
<Air tight test>
Pressurize the liquid and gas pipes to 4.0MPa (40bar) (do not pressurize more than 4.0MPa (40bar)). If the
pressure does not drop within 24 hours, the system passes the test.
If there is a pressure drop, check for leaks, make repairs, and perform the airtight test again.
<Vacuum drying>
Evacuate the system from the liquid and gas pipes by using a vacuum pump for more than 2 hours and bring the
system to –100.7kPa or less. After keeping the system under that condition for more than 1 hour, check if the
vacuum gauge rises or not. If it rises, the system may either contain moisture inside or have leaks.
If moisture might enter the piping, follow below.
(I.e., if doing work during the rainy season, if the actual work takes long enough that condensation may form
on the inside of the pipes, if rain might enter the pipes during work, etc.)
1. After performing the vacuum drying for two hours, pressurize to 0.05 MPa (i.e., vacuum breakdown) with nitrogen
gas, then depressurize down to –100.7 kPa for an hour using the vacuum pump (vacuum drying).
2. If the pressure does not reach –100.7 kPa even after depressurizing for at least two hours, repeat the vacuum
breakdown - vacuum drying process.
After vacuum drying, maintain the vacuum for an hour and make sure the pressure does not rise by monitoring with a
vacuum gauge.
Note

Содержание

Скачать