Haier AB122ACERA Service Manual - Page 5

Commercial Air Conditioner Model: AU122AEERA AB122ACERA AC122ACERA AD122ALERA 1.5 New friendly refrigerant R410A introduction: ■R410A The working pressure of R410A is approximately 1.6 times higher than R22. Because the oil in the refrigerant is different, please do not mix them. Refrigerant R22 (single) R410A (mixed) R407C (mixed) Oil Mineral oil (SONTEX 200LT) Synthetic oil (POE oil) Synthetic oil (POE oil) Pressure ratio 1 ■Operation flow Approx. 1.6 Approx. 1.1 prepare work schedule refrigerant inspection operation chart preparation 1. Always inspect the used refrigerant 2. Always use the specified refrigerant indoor unit installation refrigerant piping work drain piping work 1. Use piping material of the specified thickness 2. Do not use dirty pipe 3. Always flow nitrogen during welding work duct work insulation work remote controller installation electric wiring work outdoor unit foundation work 1. Do not connect the power supply outdoor unit installation refrigerant piping connection leakage test evacuation and drying additional refrigerant charging gas leakage check 1. Charge the nitrogen to the set pressure 2. 24 hours later,check if the pressure in the pipe has reduced 1. Air purging by refrigerant is prohibited seriously 2. Use a special vacuum pump with reverse check mechanism 1. Calculate the refrigerant additional charging amount, and charge a suitable amount. maintenance panel installation trial running and adjustment hand over 5