User manual TOSHIBA RAS-M18SAH-E SERVICE MANUAL

[. . . ] A00-9805 SUPPLEMENT SERVICE MANUAL AIR-CONDITIONER MULTI SPLIT WALL TYPE RAS-10SKH-E-1 x 2 / RAS-M18SAH-E RAS-10SKH-E-1 x 2, RAS-13SKH-E / RAS-3M31SAH-E-1 RAS-10SKH-E-1 x 4 / RAS-4M36SAH-E x2 x3 x4 PRINTED IN JAPAN, Apr. , 1998 ToMo CONTENTS 1. DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONSTRUCTION VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] the indoor heat exchanger temperature is low when the heating operation is started. At this time, the indoor fan is stopped to prevent cold air from drifting into the room. The outdoor fan stops once in the while · When the indoor heat exchanger temperature is high, the during the heating operation. outdoor fan may be stopped by the high-temperature limit control operation. · When the compressor current is large, the outdoor fan may be stopped by the current limit control operation. Compressor does not work though room Compressor does not work while the compressor restart delay temperature is in the range of turning the (3-min. ) timer is active. During automatic operation, the operation After selection of the cooling and heating operation, the operation mode changes. mode is selected again when the compressor off mode continues for 15 min. During automatic operation mode, the When the room temperature is within setting temperature ± 1°C fan only operation continues. the fan only mode is selected. 3 4 5 6 7 8 9 10 When the power is tur ned on, the When the auto restart controlling is selected, the operation is operation starts automatically. performed automatically in the previous operation mode after the power supply has been turned on. ­ 35 ­ 9-2. Role of Indoor Unit Controller The indoor unit controller receives the operation commands from the remote control and assumes the following functions. · Measurement of the draft air temperature of the indoor heat exchanger by using the thermo. · Measurement of the indoor heat exchanger temperature by using the thermo. · Louver motor control · Control of the indoor fan motor operation · Control of the LED display · Control of the outdoor unit compressor, 4-way valve and the outdoor fan motor. 9-2-2. Role of Outdoor Unit Controller RAS-M18SAH-E, RAS-3M31SAH-E-1 (Lower Unit) RAS-4M36SAH-E · Measurement of the outdoor heat exchanger temperature by using the thermo. · Control of the outdoor unit compressor, 4-way valve and the outdoor fan motor. 9-2-3. Display of Abnormalities and Judgement of the Abnormal Spots The indoor unit of this machine observes the operation condition of the air conditioner and displays the contents of the self-diagnosis as block displays on the display panel of the indoor unit. Table 9-2-1 Block display A B C D E F H OPERATION display blinking (1 Hz) OPERATION display blinking (5 Hz) OPERATION display blinking (5 Hz) OPERATION display blinking (5 Hz) OPERATION display blinking (5 Hz) OPERATION and TIMER display blinking (5 Hz) OPERATION, TIMER and PRE-DEF. display blinking (5 Hz) Block display Power failure (when power is ON) Thermo. sensor (TA) short/break Heat exchanger sensor (TC) short/break Indoor fan lock, abnormality of indoor fan Indoor P board failure . C. Wrong wiring of connecting cable Heat exchanger sensor (TE) short/ break Compressor trouble (1) Judgement from defective operation or abnormal operation Table 9-2-2 Symptom No reaction on remote control operation Check Turn off the power once, turn it on again and try to operate the remote control again. Primary judgement The indoor part (including the remote control) is defective. [. . . ] (6 screws) Remarks , -1 Back cabinet × 6 Screws , -2 P. C. board assembly. , -3 Capacitor for compressor 1) Remove the capacitor band. (Each 1 screw) 2) Disconnect the lead wire from the capacitor terminal. , -4 Capacitor for fan 1) Remove the electrical parts cover. (2 screws) 3) Disconnect the lead wire from the capacitor terminal. Connector P. C. board support , -5 Transformer for outdoor unit 1) Remove the electrical parts cover. [. . . ]