Haier 1U25S2SQ1FA [25/54] Installation procedure

Haier 1U25S2SQ1FA [25/54] Installation procedure
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Installation Procedure Air Tightness Test After finishing connection of refrigerant pipe it shall perform air tightness test English The air tightness test adopts nitrogen tank to give pressure according to the pipe connection mode as the following figure shown The gas and liquid valve are all in close state In order to prevent the nitrogen entering the circulation system of outdoor unit tighten the valve rod before giving pressure both gas and liquid valve rods Low pressure piezometer stop valve totally closed Liquid side 1 Pressurize for over 3 minutes at 0 3MPa 3 0 kg cm2g 2 Pressurize for over 3 minutes at 1 5MPa 15 kg cm2g A large leakage will be found 3 Pressurize for about 24 hours at 3 0MPa 30 kg cm2g A small leakage will be found Check if the pressure drops If the pressure does not drop then pass If the pressure drops then please check the leaking point When pressurizing for 24 hours a variation of 1 C in the ambient temperature will cause a variation of 0 01 MPa 0 1 kg cm2g in pressure It shall be corrected during test Checking the leaking point In 1 to 3 steps if the pressure drops check the leakage in each joint by listening touching and using soap water etc to identify the leaking point After confirming the leaking point welding it again or tighten the nut tightly again 22

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