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| Unit operation | Explanation | |
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COOL | The ON/OFF operation | The operation lamp illuminates. | The outdoor unit does not operate for 3 minutes | |||
| button on the remote | The indoor fan operates at the set fan speed. | even after the breaker is turned ON. | |||
| controller is pressed. | The outdoor unit stops. |
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| The outdoor unit starts. | The frequency is increased at the rate of 0.5 | ||
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| Hz every 1 seconds. | |
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| (Compressor and the outdoor fan start.) |
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| When the frequency reaches Hz, | This is in order to stabilize the return of oil to the | ||
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| frequency increases are stopped for a period | compressor. | ||
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| of seconds. (Refer to Table 2.) |
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| The frequency then increases. | If the indoor and outdoor temperatures are high, | ||
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| the current peak | |
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| any increases in frequency. | |
| The room temperature | The indoor temperature and the desired | Operating frequency is stabilized in order to | |||
| has reached the | temperature are approximately equal. | maintain a comfortable environment. | |||
| desired temperature. |
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| The thermostat turns |
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| The outdoor unit stops. (It does not stop if the | ||
| OFF. |
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| thermostart for another indoor unit is ON.) | ||
| The thermostat turns | After the thermostat turns ON again, the | After 3 minutes, the outdoor unit begins operating | |||
| ON again. | outdoor unit will not operate for 3 minutes, | automatically. | |||
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| even if the room temperature increases | During these 3 minutes, a pressure balance is | ||
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| above the desired temperature. | achieved, allowing the compressor to start | ||
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| more easily. | |
| Freeze prevention | When the temperature of the indoor heat | In order to protect against freezing, the | |||
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| exchanger drops to approximately 2 °C | compressor stops temporarily, until the | ||
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| or below, the compressor turns OFF, the | temperature of the indoor heat exchanger has | ||
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| outdoor fan turns OFF, and the indoor fan | risen. | ||
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| continues operating with no changes. |
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| Approximately 3 minutes later, if the |
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| temperature of the indoor heat exchanger |
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| is adove 8 °C, the system returns to its |
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| original conditions. |
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| Stop | All indicator lamps turn OFF. The indoor and |
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| outdoor units stop. |
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| Operation is restarted | Starts operating in the same operating mode | Within 4 hours after operation was stopped, it is | |||
| within 4 hours (only when | (COOL) and with the same temperature | assumed that there has been no significant | |||
| AUTO mode is selected | settings as before operation was stopped. | change in the indoor and outdoor temperatures, | |||
| with the remote |
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| and the previous conditions (COOL) are stored. | ||
| controller). |
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| Operation starts after 4 | New operating mode is determined based on |
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| hours or more have | the temperature conditions at the time the |
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| passed. | ON/OFF operation button is pressed. |
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| Frequency control |
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| (Hz) |
| (senconds) |
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| Outdoor air temperature is below 0 °C. | Outdoor air temperature is 0 °C or higher. |
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| (25) Hz |
| (120) seconds | (60) seconds |
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| (35) Hz |
| (60) seconds | (30) seconds |
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| (45) Hz |
| (60) seconds | (30) seconds |
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| (55) Hz |
| (180) seconds | (90) seconds |
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Table 2
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