5. Installation Instructions
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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
Approx. 1.6
Approx. 1.1
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Operation flow
1. Calculate the refrigerant additional charging
amount, and charge a suitable amount.
1. Air purging by refrigerant is prohibited seriously
2. Use a special vacuum pump with reverse check
mechanism
1. Charge the nitrogen to the set pressure
2. 24 hours later,check if the pressure in the pipe
has reduced
1. Do not connect the power supply
1. Use piping material of the specified thickness
2. Do not use dirty pipe
3. Always flow nitrogen during welding work
hand over
trial running and adjustment
maintenance panel installation
gas leakage check
additional refrigerant charging
evacuation and drying
leakage test
refrigerant piping connection
outdoor unit installation
outdoor unit foundation work
electric wiring work
remote controller installation
insulation work
duct work
drain piping work
refrigerant piping work
indoor unit installation
operation chart preparation
1. Always inspect the used refrigerant
2. Always use the specified refrigerant
refrigerant inspection
prepare work schedule
-13-
Commercial Air Conditioner
Model: AU18
/22
2XFERA
AS072/092/122XVERA