Toyotomi KURO Mini Service Manual page 18

6.2 Overload (window type, TTW, PTAC, portable type and recreational vehicle AC)
Main check points ：
(1) compressor (2) refrigerant (3) air inlet/outlet, heat exchanger and internal system is dirty and blocked
(4) fan (5) operation environment
Operation
environment is
Is the heat exchanger
too dirty, or does it block the
air inlet/outlet?
The rotate speed
of fan is abnormal, rotate speed is
too low or the fan is not
functioning
Compressor
operation is abnormal, strange
noise or leakage occurs. Temperature
of outer casing is
Is the internal system
blocked (dirt blockage, ice blockage,
oil blockage, the 4-way valve is not
completely opened)?
Is the temperature
sensor of outer tube on the main
board normal?
Replace with a new controller with the same model
Start
bad
N
N
N
N
N
N
too high
N
N
N
Y
End
The air conditioner should
operate under low ambient
Y
temperature and humidity
Eliminate malfunction?
Clean the heat exchanger
Y
and remove the plugs
Eliminate malfunction?
Check the fan, re-install
the fan to make it operate
Y
normally;
Eliminate malfunction?
Check if there are any shelters near the condenser, if yes,
take them away; check the component with abnormal sound,
replace the faulted component; if the refrigerant is leaking,
Y
find out the leakage point and supplement the welding process
or replace the broken component, conduct vacuuming and
perfusion
If the capillary keeps defrosting, replace the capillary
component, conduct vacuuming and perfusion; if the 4-way
Y valve conducting heating with heat pump has no reversing,
then replace the solenoid valve or 4-way valve
N
Replace the temperature sensor
N
N
Eliminate malfunction?
Eliminate malfunction?
Eliminate malfunction?
Y
Y
Y
Y
Y
Y