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1. Special Functions
a. Defrosting Control
• Conditions for defrosting
• After the time for defrosting is judged to be satisfied, if the temperature for defrosting is satisfied after detections
for continuous 3 minutes, the defrosting operation will start.
• Conditions of finishing defrosting
• The defrosting operation can exit when any of the conditions below is satisfied.
• T outdoor temperature ≥ (T outdoor ambient temperature – [T temperature 1 of finishing defrosting]).
• The continuous running time of defrosting reaches [maximum defrosting time].
b. Control Logic
• Compressor Control
• Start the compressor after starting cooling, heating dehumidifying, operations and the outer fans start for
5 seconds. When the machine is shutdown, in safety stops and when switching to air-supplying mode, the
compressor will stop immediately. In all modes: once the compressor starts up, it will not be allowed to stop until
having run the [T minute compressor running time]. (Note: including cases of shutdown when the temperature
point is reached; except the cases requiring stopping the compressor such as fault protection, remote shutdown,
mode switching, etc.). In all modes: once the compressor stops, it will be allowed be restart after 3 minute
delay. (Note: The indoor units have a function of power memory, the machine can be restarted after the remote
shutdown and powering up again without delay).
c. Cooling Mode.
• Start the machine to enter cooling operation for cooling, the compressor is switched on.
d. Dehumidifying Mode
• Same as cooling mode.
e. Air Supplying Mode
• The compressor is switched off.
f. Heating Mode
• Start the machine to enter into heating operation for heating, the compressor is switched on.
• Defrosting starts: the compressor is shut down and restarts it after 55-second delay.
• Defrosting ends: the compressor stops, then starts after 55-second delay.
2. Outer Fans Control
a. Only the outer fans run for at least 80 seconds in each air flow speed can the air flow be switched.
b After the outer fans run compulsively in high speed for 80 seconds when the machine starts up, control the air flow
according to the logic.
c. After remote shutdown, safety stops, and when the machine stops after reaching the temperature point, as well as
after the compressor stops, extend 1 minute, the outer fans will stop (During the period in the 1 minute, the air flow of
outer fans can be changed according to the outdoor ambient temperature changes). When running with force, the
outdoor fans shall run in the highest air flow.
3. 4-Way Valve Control
a. The 4-way valve control under the modes of cooling, dehumidifying and supplying air, closing.
b. The status of 4-way valve control under the heating mode: getting power.
c. When the 4-way valve is under power, the machine will start in heating mode, the 4-way valve will get power
immediately.
d. 4-way valve power turn off control under heating mode.
e. When you should turn off the power or switch to other heating mode, the power of 4-way valve will be cut after 2
minutes of the compressor stopped.
f. When all kinds of protection stops, the power of 4-way valve will be cut after delaying 4 minutes.
g. Defrosting under heating mode begins when the power of 4-way valve will be cut after 50 seconds of entering into
the defrosting compressor.
h. Defrosting stops when the 4-way valve will get power after 50 seconds of exiting the defrosting compressor.
4. Evaporator Frozen Preventing Protection Function
a. At the mode of cooling, dehumidifying: Evaporator frozen prevention protection function is allowed to begin after 6
minutes of starting the compressor.
