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Service Manual
Outdoor Units
1. Input Parameter Compensation and Calibration
(1) Check the ambient temperature compensation function Indoor ambient temperature compensation function.
a. In cooling mode, the indoor ambient temperature participating in computing control = (T
)
compensation
b. In heating mode, the indoor ambient temperature participating in computing control= (T
)
compensation
(2) Check effective judgment controls of parameters
Effective judgment function of the outdoor exhaust temperature thermo-bulb When conditions a and b are satisfied, the outdoor exhaust
temperature thermo-bulb is judged not to be connected into place, the mainboard of outer units will display failure of the outdoor exhaust
temperature thermo-bulb (not connected into place), stop the machine for repairing, and resume the machine by remote controls of ON/
OFF.
a. Judgment of exhaust detection temperature change:
After the compressor starts up and runs for 10 minutes, if the compressor frequency f ≥ 40Hz, and the rising value Texhaust (T
- T
up for 10 minutes)
exhaust (before start-up)
once when the power is on the first time).
b. Comparative judgment of exhaust detection temperature and condenser detection temperature (T
, T
= T
mode
pipe temperature
indoor pipe temperature in heating mode
40Hz, and T
≥(T
pipe temperature
once when power is on the first time).
2. Basic Functions
(1) Cooling Mode
1. Conditions and processes of cooling operation:
(1) If the compressor is shut down, and [T
for cooling, the cooling operation will start;
(2) During operations of cooling, if 0ºC ≤ [T
will be still running;
(3) During operations of cooling, if 2ºC ≤ [T
stop after reaching the temperature point.
2. Temperature setting range
(1) If T
outdoor ambient temperature
(2) If T
outdoor ambient temperature
minimum setting temperature for outer units judgment is 25ºC .
(2) Dehumidifying Mode
1. Conditions and processes of dehumidifying operations: Same as the cooling mode;
2. The temperature setting range is: 16~30ºC ;
(3) Air-supplying Mode
1. The compressor, outdoor fans and four-way valves are switched off;
2. The temperature setting range is: 16~30ºC.
(4) Heating Mode
1. Conditions and processes of heating operations: (Tindoor ambient temperature is the actual detection temperature of indoor environment
thermo-bulb, Theating indoor ambient temperature compensation is the indoor ambient temperature compensation during heating
operations)
(1) If the compressor is shut down, and [(T
enter into heating operations for heating;
(2) During operations of heating, if 0ºC ≤ [(T
operation will be still running;
(3) During operations of heating, if 2ºC ≤ [(T
stop after reaching the temperature point.
2. The temperature setting range in this mode is: 16~30ºC .
Technical Information
) < 2ºC , the outdoor exhaust temperature thermo-bulb can be judged not to be connected into place (judging
): After the compressor starts up and runs for 10 minutes, if the compressor frequency f ≥
), the outdoor exhaust temperature thermobulb can be judged not to be connected into place (judging
exhaust+3
– (T
indoor ambient temperature
set up
– (T
indoor ambient temperature
set up
– (T
indoor ambient temperature
set up
≥ [T
low-temperature cooling temperature
< [T
low-temperature cooling temperature
indoor ambient temperature
indoor ambient temperature
indoor ambient temperature
– ⊿ T
cooling indoor ambient temperature compensation)
– ⊿ T
cooling indoor ambient temperature compensation)
– ⊿ T
cooling indoor ambient temperature compensation)
], the temperature can be set at: 16~30ºC (Cooling at room temperature);
], the temperature can be set at: 25~30ºC (Cooling at low temperature), that is, the
– ⊿ T
heating indoor ambient temperature compensation
– ⊿ T
heating indoor ambient temperature compensation
– ⊿ T
heating indoor ambient temperature compensation
– ⊿ T
indoor ambient temperature
cooling indoor ambient temperature
– ⊿ T
indoor ambient temperature
heating indoor ambient temperature
= T
pipe temperature
outdoor pipe temperature in cooling
] ≤ 0.5ºC, start up the machine
] < 2ºC, the cooling operation
], the cooling operation will
) –T
] ≤ 0.5ºC, start the machine to
set up
) –T
set up
) –T
], the heating operation will
set up
exhaust (after start-
] < 2ºC, the heating
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