RSTN
RST
N
Outdoor Unit
Power Supply Cable
building
Terminal
block
change
Occurrence of strange noise from
compressor
No variation of pressure gages.
Troubles and Solutions
Troubles
Solutions
Outdoor unit circuit
Change the R,S wires to the terminal
block.
➲
➲
➲
If the main cable for power supply is connected incorrect or wrong, it shall cause strange noise from
the compressor and cooling operation does not work.
Evaluation of the performance
Operate unit for 15~20 minutes, then check the
system refrigerant charge:
1. Measure the pressure of the gas side
service valve.
2. Measure the temperature of the intake and
discharge of air.
3. Ensure the difference between the intake
temperature and the discharge is more than
8°C
4. For reference, the gas side pressure of
optimum condition is as below.(Cooling)
:
If the actual pressure are higher than
shown, the system is most likely over-
charged, and charge should be removed.
If the actual pressure are lower than
shown, the system is most likely
undercharged, and charge should be
added.
The air conditioner is now ready for use.
Test Running
1. Check that all tubing and wiring have been properly connected.
2. Check that the gas and liquid side service valves are fully open.
R22 35° C (95° F) 4~5 kg/cm
2
G (56.8 ~ 71.0 P.S.I.G.)
R410A 35° C (95° F) 8.5~9.5 kg/cm
2
G (120 ~ 135 P.S.I.G.)
Outside ambient
TEMP.
Refrigerant
The pressure of the gas side
service valve.
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