8-3. Checking the Outdoor System
8-3-1. Checking the outdoor unit
No. | Work procedure | Check items (unit operation) |
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1 | • Apply 220 V AC between terminals L and N on the | • The LED (red) on the control board must illuminate. |
| outdoor unit terminal plate. |
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2 | • | • The compressor, fan motor, |
| of | valve (for the hot gas bypass) must turn ON. |
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NOTE If the above check items are okay, but the outdoor unit does not operate, there may be a faulty connection between the indoor unit and the outdoor unit.
8-3-2. Checking the defrost operation
Using forced defrost operation to check this function.
No. | Work procedure |
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1 | • Connect a dummy resistor of 39 k ohm to the outdoor |
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| coil temperature sensor connector. |
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| Indoor fan |
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| 30 sec. |
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| Setting | LL Stop |
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| Setting | |||||||||
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| CM |
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| (80 Hz) |
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| ON |
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| Solenoid valve |
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| 5 sec. |
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| 10 sec. | |||
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| bypass) OFF |
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| ON |
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| OFF | ||||||
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| Outdoor fan |
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| ON |
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| OFF |
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| Defrost start | Release |
• The maximum length of defrost operation is 12 minutes.
Defrost can also be released based on the below conditions for the outdoor heat exchanger sensor.
Less than 2 minutes | Not released |
2 minutes or more | 14 °C or higher (*1) |
*1 However, the condition is (20 °C) or higher when the outdoor air temperature is below 0 °C.
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