14. Servicing Mode
14.1 CU-2E18NBU
14.1.1Pump down operation (SW1)
Operate the pump down process according to the following procedure o Confirm the valve on the liquid side and gas side are open.
o Press PUMP DOWN button (SW1) on the Service PCB inside the outdoor unit for more than 5 seconds. Pump down (cooling) operation is performed for 15 minutes.
o Set the liquid side 3 way valve to close position and wait until the pressure gauge indicates 1.45PSI (0.1kg/cm2G).
o Immediate set the gas side valve to close position and then press the PUMP DOWN button (SW1) to stop the pump down operation.
NOTE: Pump down operation will stop automatically after 15 minutes if PUMP DOWN switch (SW1) is not pressed again. Pump down operation is not started within 3 minutes after compressor is stopped.
LED | 2 | 3 | 4 | 5 | Message |
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| Pump down operation in progress |
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Status |
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| 3 minutes before operation end |
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| 2 minutes before operation end | |
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| 1 minute before operation end | |
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| Pump down operation end |
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: Flashing
14.1.2Test Run operation
Test operation can be carried out using TEST OPERATION button (SW2) on the Service PCB inside the outdoor unit.
For Cooling test, press the TEST OPERATION button (SW2) for 5 seconds or more but less than 10 seconds, LED1 and LED 2 will illuminate when shift into cooling test operation.
For Heating test, press the TEST OPERATION button (SW2) for more than 10 seconds, LED 1 and LED 3 will illuminate when shift into heating test operation.
Press the TEST OPERATION button (SW2) again to cancel test operation.
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