• 4-way valve control
• P.M.V. control
• Operation control of outdoor fan motor

9. OPERATION DESCRIPTION

9-1. Outline of Air Conditioner Control

This air conditioner is a capacity-variable type air conditioner, which uses DC motor for the indoor fan motor and the outdoor fan motor. And the capacity- proportional control compressor which can change the motor speed in the range from 9 to 120 rps is mounted. The DC motor drive circuit is mounted to the indoor unit. The compressor and the inverter to control fan motor are mounted to the outdoor unit. The entire air conditioner is mainly controlled by the indoor unit controller.

The indoor unit controller drives the indoor fan motor based upon command sent from the remote control- ler, and transfers the operation command to the outdoor unit controller.

The outdoor unit controller receives operation command from the indoor unit side, and controls the outdoor fan and the pulse motor valve. (P.M.V) Besides, detecting revolution position of the com- pressor motor, the outdoor unit controller controls speed of the compressor motor by controlling output voltage of the inverter and switching timing of the supply power (current transfer timing) so that motors drive according to the operation command.

And then, the outdoor unit controller transfers reversely the operating status information of the outdoor unit to control the indoor unit controller.

As the compressor adopts four-pole brushless DC motor, the frequency of the supply power from inverter to compressor is two-times cycles of the actual number of revolution.

(1)Role of indoor unit controller

The indoor unit controller judges the operation commands from the remote controller and assumes the following functions.

•Judgment of suction air temperature of the indoor heat exchanger by using the indoor temp. sensor. (TA sensor)

•Detection of inverter input current and current release operation

•Over-current detection and prevention operation to IGBT module (Compressor stop function)

•Compressor and outdoor fan stop function when serial signal is off (when the serial signal does not reach the board assembly of outdoor control by trouble of the signal system)

•Transferring of operation information (Serial signal) from outdoor unit controller to indoor unit controller

•Detection of outdoor temperature and opera- tion revolution control

•Defrost control in heating operation (Temp. measurement by outdoor heat exchanger and control for four-way valve and outdoor fan)

(3)Contents of operation command signal (Serial signal) from indoor unit controller to outdoor unit controller

The following three types of signals are sent from the indoor unit controller.

•Operation mode set on the remote control

•Compressor revolution command signal defined by indoor temperature and set temperature (Correction along with variation of room temperature and correction of indoor heat exchanger temperature are added.)

•Temperature of indoor heat exchanger

•For these signals ([Operation mode] and [Compressor revolution] indoor heat exchanger temperature), the outdoor unit controller monitors the input current to the inverter, and performs the followed operation within the range that current does not exceed the allow- able value.

(4)Contents of operation command signal (Serial signal) from outdoor unit controller to indoor unit controller

• Judgment of the indoor heat exchanger

The following signals are sent from the outdoor

temperature by using heat exchanger sensor

unit controller.

(TC sensor) (Prevent-freezing control, etc.)

• The current operation mode

• Louver motor control

• The current compressor revolution

• Indoor fan motor operation control

• Outdoor temperature

• LED (Light Emitting Diode) display control

• Existence of protective circuit operation

• Transferring of operation command signal

For transferring of these signals, the indoor

(Serial signal) to the outdoor unit

unit controller monitors the contents of signals,

• Reception of information of operation status

and judges existence of trouble occurrence.

(Serial signal including outside temp. data) to

Contents of judgment are described below.

the outdoor unit and judgment/display of error

• Whether distinction of the current operation

• Air purifier operation control

(2) Role of outdoor unit controller

status meets to the operation command signal

• Whether protective circuit operates

Receiving the operation command signal (Serial

When no signal is received from the outdoor

signal) from the indoor unit controller, the out-

door unit performs its role.

unit controller, it is assumed as a trouble.

• Compressor operation control Operations followed to judgment of serial signal from indoor side.

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Toshiba RAS-M14EAV-E, RAS-M13EKCVP-E, RAS-M18EACV-E, RAS-M14EACV-E, RAS-M16EKCVP-E Outline of Air Conditioner Control
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RAS-B10EKVP-E, RAS-M14EAV-E, RAS-B13EKVP-E, RAS-M18EAV-E, RAS-M10EKCVP-E specifications

Toshiba is renowned for producing high-quality air conditioning systems that blend performance with energy efficiency. Among its notable offerings are the RAS-M18EACV-E, RAS-M18EAV-E, RAS-B13EKVP-E, RAS-M16EKCVP-E, and RAS-M14EACV-E models. These units cater to various air conditioning needs, providing optimal comfort for residential and light commercial spaces.

The RAS-M18EACV-E and RAS-M18EAV-E models are designed with advanced Inverter technology, which ensures efficient operation by adjusting the compressor speed according to the cooling demand. This feature significantly reduces energy consumption, leading to lower electricity bills while maintaining a consistent indoor temperature. Both units come equipped with a high-capacity cooling system that can efficiently manage even the hottest summer days.

On the other hand, the RAS-B13EKVP-E offers a balance of performance and affordability. It features a compact design ideal for smaller rooms, making it a popular choice for residential applications. This model includes a user-friendly remote control system, allowing for easy temperature adjustments from anywhere in the room.

The RAS-M16EKCVP-E and RAS-M14EACV-E models showcase Toshiba’s commitment to durability and reliability. These units utilize high-quality components and advanced cooling technologies to ensure long-lasting performance. They also feature robust air filtration systems that purify the air, aiding in the reduction of allergens and dust particles, thus enhancing indoor air quality.

All of these models are equipped with a range of user-friendly features, including programmable timers, sleep modes, and adjustable airflow settings, giving users greater control over their indoor environment. Additionally, many of these units utilize eco-friendly refrigerants, aligning with global efforts to reduce environmental impact.

In summary, Toshiba’s RAS-M18EACV-E, RAS-M18EAV-E, RAS-B13EKVP-E, RAS-M16EKCVP-E, and RAS-M14EACV-E air conditioning systems offer a blend of innovative technologies, energy-efficient operation, and user-friendly features. Whether for residential cooling or light commercial use, these models stand out for their effectiveness and reliability, catering to varying demands while ensuring maximum comfort. Toshiba’s dedication to quality and sustainability is reflected in every model, making them a trustworthy choice for discerning consumers.
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