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3. Special Controls
In addition to ordinary heating and cooling operation, this system also includes the following 4 types of special
controls for control of the system as a whole:
3-1. 4-way valve switching control
3-2. Reverse cycle start control
3-3. Inter systems refrigerant oil recovery control
3-4. Reverse cycle defrost control
3-1. 4-way Valve Switching Control
4-way valve switching control is performed under the following conditions:
•
The indoor unit operating mode has been switched (Cooling mode / Heating mode).
•
The power is turned ON and the microcomputer has been initialized.
•
Reverse cycle start control has ended.
This control is performed in order to ensure reliable switching of the 4-way valve. It also performs control to com-
pensate for tubing heat radiation loss when heating starts after the outdoor unit was stopped for a long time, and
control for oil recovery.
(1)
Control when the outdoor unit heat exchanger is functioning as a condenser (indoor unit mode = Cooling)
Control time
Outdoor units
Electronic
control valve
Indoor
units
Fan
*
When the above operation is finished, normal operation starts at the horsepower determined by the indoor
units where thermostats are ON.
(2)
Control when outdoor unit heat exchanger is functioning as an evaporator (indoor unit mode = Heating)
Control time
Outdoor units
Electronic
control valve
Indoor
units
Fan
*
When the above operation is finished, normal operation starts at the horsepower determined by the indoor
units where thermostats are ON.
1 minute
Operates at a compressor frequency of 44 Hz.
All indoor units operate at a fixed pulse according to the indoor
unit capacity.
The fan operates at the set fan speed, is stopped, or operates at
"L" fan speed, according to the operation mode of the indoor unit.
Min. 1 minute to Max. 5 minutes
(until Tc
95°F)
Operates at a compressor frequency of 44 Hz.
All indoor units operate at 480 pulses.
The fan stops.
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Mini ECO-i SYSTEM
Control Functions
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