14. Servicing Mode

14.1 CU-2E18NBU

14.1.1Pump down operation (SW1)

šOperate 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

 

 

 

 

 

 

 

 

 

 

 

Pump down operation in progress

 

 

 

 

 

 

Status

 

 

 

 

3 minutes before operation end

 

 

 

 

 

 

 

 

 

2 minutes before operation end

 

 

 

 

 

 

 

 

 

1 minute before operation end

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pump down operation end

 

 

 

 

 

 

: Flashing

14.1.2Test Run operation

šTest operation can be carried out using TEST OPERATION button (SW2) on the Service PCB inside the outdoor unit.

šFor 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.

šFor 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.

šPress the TEST OPERATION button (SW2) again to cancel test operation.

27

Page 27
Image 27
Panasonic service manual Servicing Mode, 14.1 CU-2E18NBU, Pump down operation SW1, Test Run operation

CU-2E18NBU specifications

The Panasonic CU-2E18NBU is a highly efficient outdoor unit designed for residential and commercial applications, providing reliable heating and cooling year-round. This unit is part of Panasonic's extensive range of HVAC solutions, known for their innovation and energy efficiency.

One of the standout features of the CU-2E18NBU is its advanced inverter technology. This technology allows the system to adjust the compressor speed based on the temperature demand, resulting in reduced energy consumption and enhanced comfort. By continuously varying the output, the inverter system maintains a consistent indoor climate without the frequent on/off cycles typical of conventional systems. This not only saves energy but also extends the lifespan of the unit.

The CU-2E18NBU is designed to operate efficiently in a wide range of conditions, showcasing excellent performance in harsh climates. With a capacity of 18,000 BTU, it can efficiently cool or heat spaces effectively, making it suitable for medium-sized rooms or multiple areas when paired with compatible indoor units.

Another significant characteristic of this Panasonic model is its environmentally friendly refrigerant, R32. This refrigerant has a lower impact on global warming and ozone depletion compared to older options, making the CU-2E18NBU a smart choice for eco-conscious consumers. R32 also enhances the system's efficiency, further contributing to lower energy costs.

The unit features a robust construction, allowing it to withstand outdoor conditions while promoting durability. Its compact design allows for flexible installation options, making it easier to fit in various environments without compromising aesthetic appeal.

Moreover, the CU-2E18NBU incorporates advanced air filtration and purification technologies, improving indoor air quality. The filters are designed to capture dust, allergens, and other particulates, ensuring cleaner, healthier air.

In summary, the Panasonic CU-2E18NBU stands out for its efficient inverter technology, environmentally friendly refrigerant, and compact, durable design. With its ability to provide consistent temperature control and improve indoor air quality, this unit is a reliable solution for anyone looking to enhance their heating and cooling systems.