Outline Of Control System - Toshiba HFC R407C Service Manual

Super multi split type system

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Service manual (177 pages)

Table Of Contents

Table of Contents

The refrigerant and electrical systems of the Super Multi air conditioner are controlled by the Multi

Controller and the outdoor unit microprocessors.

All RAV heat pump, R-407C, 4/5 series indoor units are compatible with the Super Multi system, i.e. 1~5 HP .

For system operation, initially the microprocessor in each indoor unit calculates the difference between the

current room temperature (TA) and the requested temperature which has been set on the remote

controller. A demand signal is determined and transmitted to the Multi Controller microprocessor in the

form of operation commands (i.e. ON/OFF, cooling or heating operation mode, operation demand frequency).

The Multi Controller microprocessor receives operation commands from all indoor units connected,

calculates the accumulative operation command and transmits this information to the outdoor unit interface

microprocessor.

The interface microprocessor calculates the capacity required for heating or cooling and determines the

operation mode of the outdoor unit and the actual frequency of the compressor.

Control system diagram

Indoor unit 1-A

Fan

Temp. sensor (TA)

Drain pump

Indoor unit microprocessor

Remote controller

1 - B

1 - C

1 - D

2 - A

2 - B

2 - C

2 - D

Introduction