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* HIGH SPEED OPERATION
WHEN THE WATER TEMP. REACHES APPROX. 90°C (194°F) OR MORE (A/C WATER TEMP. SW IS OFF) OR THE REFRIGERANT
PRESSURE REACHES 15.5 KG/CM
2
(220 PSI, 1520 KPS) OR MORE (A/C HIGH PRESSURE SW IS OFF), CURRENT TO THE RADIATOR
FAN RELAY NO. 1 AND CONDENSER FAN RELAY NO. 2 IS CUT OFF AND THAT TO THE MOTOR IS SUPPLIED IN PARALLEL, CAUSING
THE MOTOR TO ROTATE AT HIGH SPEED.
5. AIR CONDITIONER OPERATION
WHEN THE BLOWER SW IS SET TO ON, CURRENT FROM THE 30A HEATER CB FLOWS THROUGH TERMINAL I14 (PUSH SWITCH
TYPE), 5 (LEVER SWITCH TYPE) OF THE A/C SW, TERMINAL 1 OF THE A/C DUAL PRESSURE SW → TERMINAL 2 → TERMINAL 2 OF
THE A/C AMPLIFIER, TERMINAL 1 OF THE MAGNET CLUTCH RELAY VIA THE A/C FUSE. THE ENGINE SPEED SIGNAL FROM IGNITER,
THE EVAPORATOR TEMP. SIGNAL FROM THE A/C THERMISTOR, AND THE LOCK SIGNAL FROM THE A/C COMPRESSOR ARE ALL
SUPPLIED TO THE A/C AMPLIFIER. WHEN THE A/C SW IS TURNED ON, THE A/C SW ON SIGNAL IS SENT TO THE A/C AMPLIFIER,
ACTIVATING IT AND TURNING ON THE MAGNET CLUTCH RELAY, SO THAT CURRENT FLOWS FROM TERMINAL 1 OF THE RELAY →
TERMINAL 2 → MAGNET CLUTCH, CAUSING THE COMPRESSOR TO OPERATE, THEN THE MAGNET CLUTCH ACTIVATING THE
COMPRESSOR. AT THE SAME TIME, THE CURRENT APPLIED TO THE A/C IDLE–UP VSV FLOWS THROUGH TERMINAL 5 OF THE
AMPLIFIER, ACTIVATING THE COMPRESSOR. AT THE SAME TIME, THE CURRENT APPLIED TO THE A/C IDLE–UP VSV FLOWS
THROUGH TERMINAL 5 OF THE AMPLIFIER, ACTIVATING THE VSV TO PREVENT ENGINE SPEED DROP IN A/C OPERATION. THE A/C
OPERATION IS SHUT OFF WHEN A SIGNAL INDICATING LOW EVAPORATOR TEMP., GREAT DIFFERENCE BETWEEN THE ENGINE AND
COMPRESSOR SPEEDS, HIGH WATER TEMP. SIGNAL, OR ABNORMALLY HIGH OR LOW REFRIGERANT PRESSURE, IS SUPPLIED
WHILE THE ENGINE HIGH SPEED SIGNAL EXISTS. WHEN ONE OF THESE SIGNALS IS RECEIVED, THE AMPLIFIER SHUTS OFF THE
A/C OPERATION.
WHEN THE VEHICLE SPEED IS 25 KM/H (16 MPH) OR LESS AND THE THROTTLE OPENING ANGLE IS APPROX. 80% OR MORE,
OPERATION OF THE A/C ACCELERATION CUT AMPLIFIER STOPS A/C OPERATION FOR APPROX. 3 SECONDS.
WHEN THE DIFFERENCE BETWEEN THE ENGINE AND COMPRESSOR SPEED IS EXCESSIVE, THE AMPLIFIER TURNS ON THE A/C
SW INDICATOR LIGHT TO INDICATE A FAULT.