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Leak test at 550PSI per the manual?
Hopefully I will finish the remaining lineset piping/connects this weekend on my new LG 36K BTU minisplit.
Picked up the rental nitrogen tank last night, so it's on to 24 hour pressure testing...
The LG manual states "test at 551.1PSI with nitrogen"... but then "do not exceed 551.1PSI as it may damage the system".
Seems like a really tight margin for error on a regulator... hit 551 but don't don't exceed 551.
Do you pros run the 24hr test at 550PSI or is it generally done at a lower pressure?
.....FROM THE LG INSTALL MANUAL....
1. The liquid and gas piping in each refrigerant system should be pressurized with nitrogen gas in accordance with the steps listed below.
Step 1: Pressurize to 43.5 psi for three (3) minutes or more. (Will identify if major leaks are present in the system.)
Step 2: Pressurize to 217.6 psi for three (3) minutes or more. (Will identify if major leaks are present in the system.)
Step 3: Pressurize to 551.1 psi for approximate twenty-four (24) hours. (Will identify if minor leaks are present in the system.)
Pressurizing the system to 551.1 psi does not guarantee the identification of minor leaks if the pressure is maintained for only a short time. It is recommended that the system remain pressurized for at least 24 hours.
Piping system should not be pressured to more than 551.1 psi. Pressures greater than 551.1 psi may damage the piping system and cause unit malfunction.