Sanyo CMH3172 Service Manual - Page 44
f fluctuation fan
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(1/f fluctuation fan) Control/conditions SENSOR The ON/OFF operation DRY button on the remote controller is pressed. Unit operation Explanation The operation lamp illuminates. The indoor fan operates at the set fan speed. The outdoor unit stops. The outdoor unit does not operate for 3 minutes even after the breaker is turned ON. The outdoor unit starts. (Compressor and the outdoor fan start.) When the frequency reaches Hz, frequency increases are stopped for a period of seconds. (Refer to Table 1.) The frequency then increases. The room temperature reaches the desired temperature, and there is no need for further cooling. DRY operation starts DRY A operation The indoor fan changes between "Low" and "LL" (very low) over a 6-minute cycle. This is 1/f fluctuation fan operation. (Refer to Fig. 1.) The room temperature is 59 °F or higher, and is slightly too cold. DRY B operation (1) The indoor fan changes between "Low" and "LL" (very low) over a 6-minute cycle. This is 1/f fluctuation fan operation. The frequency is increased at the rate of 0.5 Hz every 1 seconds. This is in order to stabilize the return of oil to the compressor. If the indoor and outdoor temperatures are high, the current peak cut-off activates, stopping any increases in frequency. Operating frequency is stabilized in order to maintain a comfortable environment. Operates to effectively dehumidify the air while not excessively reducing the indoor temperature. The indoor unit operates at 1/f fluctuation fan operation, at a fan speed that does not cause a chilly feeling. The compressor operates on a 3-minutes ON, 6-minutes OFF cycle, to prevent the room temperature from dropping too much. (2) After appoximately 3 minutes, the compressor turns OFF, the outdoor fan turns OFF, and the indoor fan turns OFF. The room temperature is below 59 °F. (3) After approximately 6 minutes, the conditions return to (1). Monitoring operation begins. 1/f fluctuation fan 250 When monitoring operation begins, the compressor stops, and the indoor fan operates at "LL" (very low) speed. 200 150 (Step) 100 50 0 6-minute cycle Fig. 1 44