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Product Introduction
Basic Functions - 18K & 24K 230 volt
Outdoor Unit
A. 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 = (Tindoor ambient
temperature -
Tcooling indoor ambient temperature compensation)
b. In heating mode, the indoor ambient temperature participating in computing control= (Tindoor ambient
temperature -
Theating indoor ambient temperature 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 main board 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 (Texhaust (after start-up for 10 minutes) - Texhaust
(before start-up)) < 35.6°F, the outdoor exhaust temperature thermo-bulb can be judged not to be connected into
place (judging once when the power is on the first time).
b. Comparative judgment of exhaust detection temperature and condenser detection temperature (Tpipe temperature=
Toutdoor pipe temperature in cooling mode, Tpipe temperature = Tindoor pipe temperature in heating mode): After
the compressor starts up and runs for 10 minutes, if the compressor frequency f ≥ 40Hz, and Tpipe temperature
≥(Te 37.4°F), the outdoor exhaust temperature thermo-bulb can be judged not to be connected into place
(judging once when power is on the first time).
B. Basic Functions
(1) Cooling Mode
1. Conditions and processes of cooling operation:
(1) If the compressor is shut down, and [Tsetup - (Tindoor ambient temperature - ≥ Tcooling indoor ambient
temperature compensation)]≤ 32.9 °F, start up the machine for cooling, the cooling operation will start;
(2) During operations of cooling, if 32°F ≤ [Tsetup - (Tindoor ambient temperature -
Tcooling indoor ambient
temperature compensation)] < 35.6 °F, the cooling operation will be still running;
(3) During operations of cooling, if 32°F≤ [Tsetup - (Tindoor ambient temperature -
Tcooling indoor ambient
temperature compensation)], the cooling operation will stop after reaching the temperature point.
2. Temperature setting range
(1) If Toutdoor ambient temperature ≥ [Tlow-temperature cooling temperature], the temperature can be set at:
60.8~86°F (Cooling at room temperature);
(2) If Toutdoor ambient temperature < [Tlow-temperature cooling temperature], the temperature can be set at:
77~86°F (Cooling at low temperature), that is, the minimum setting temperature for outer unit’s judgment is 77°F).
(2)Drying Mode
1. Conditions and processes of drying operations: Same as the cooling mode;
2. The temperature setting range is: 60.8-86°F;
(3) Air-supplying Mode
1. The compressor, outdoor fans and four-way valves are switched off;
2. The temperature setting range is: 60.8-86°F.
