Sanyo CLM2472 Service Manual - Page 46

COOL Control/conditions The ON/OFF operation 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 has reached the desired temperature. The thermostat turns OFF. The thermostat turns ON again. The indoor temperature and the desired temperature are approximately equal. After the thermostat turns ON again, the outdoor unit will not operate for 3 minutes, even if the room temperature increases above the desired temperature. Freeze prevention When the temperature of the indoor heat exchanger drops to approximately 35.6 °F or below, the compressor turns OFF, the outdoor fan turns OFF, and the indoor fan continues operating with no changes. Stop Approximately 3 minutes later, if the temperature of the indoor heat exchanger is adove 46.4 °F, the system returns to its original conditions. All indicator lamps turn OFF. The indoor and outdoor units stop. Operation is restarted within 4 hours (only when AUTO mode is selected with the remote controller). Starts operating in the same operating mode (COOL) and with the same temperature settings as before operation was stopped. Operation starts after 4 hours or more have passed. New operating mode is determined based on the temperature conditions at the time the ON/OFF operation button is pressed. 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. The outdoor unit stops. (It does not stop if the thermostart for another indoor unit is ON.) After 3 minutes, the outdoor unit begins operating automatically. During these 3 minutes, a pressure balance is achieved, allowing the compressor to start more easily. In order to protect against freezing, the compressor stops temporarily, until the temperature of the indoor heat exchanger has risen. Within 4 hours after operation was stopped, it is assumed that there has been no significant change in the indoor and outdoor temperatures, and the previous conditions (COOL) are stored. Frequency control (Hz) (25) Hz (35) Hz (45) Hz (55) Hz (senconds) Outdoor air temperature is below 32 °F. Outdoor air temperature is 32 °F or higher. (120) seconds (60) seconds (60) seconds (30) seconds (60) seconds (30) seconds (180) seconds (90) seconds Table 1 46