Page 3 - Safety Precautions
3 CAUTION WARNING WARNING 1. Safety Precautions Read the following “SAFETY PRECAUTIONS” carefully before perform any servicing. Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the power plug and main circuit for the model installed. ...
Page 6 - Multi split combination possibility:
6 Item Unit OUTDOOR UNIT Air Volume High m 3 /min (ft 3 /min) 37.2 (1313) Refrigerant Control Device Expansion Valve Refrigerant Oil FV50S Refrigerant (R410A) g (oz) 1.92k (67.8) Dry Bulb Wet Bulb Maximum °C (°F) 32 (89.6) 23 (73.4) Cooling Minimum °C (°F) 16 (60.8) 11 (51.8) Maximum °C (°F) 30 (86....
Page 9 - Refrigeration Cycle Diagram
Page 11 - Wiring Connection Diagram
Page 12 - Electronic Circuit Diagram
Page 13 - Printed Circuit Board; Main Printed Circuit Board
13 8. Printed Circuit Board 8.1 Main Printed Circuit Board
Page 15 - Installation Information; Points; QUICK GUIDE PIPING AND ELECTRICAL SPECIFICATION
15 9. Installation Information 9.1 Check Points QUICK GUIDE PIPING AND ELECTRICAL SPECIFICATION Piping size Indoor (ID) & Outdoor (OD) units: Possible Combination Patterns Capacity (Btu/h) Refrige- rant Gas Liquid Standard pipe length Max. Eleva- tion Min. pipe length for each ID unit Max. from ...
Page 16 - Instruction; Select The Best Location; Unit
16 10. Installation Instruction 10.1 Select The Best Location 10.1.1 Outdoor Unit If an awning is built over the unit to prevent direct sunlight or rain, be careful that heat radiation from the condenser is not obstructed. There should not be any animal or plant which could be affected by hot ai...
Page 17 - Outdoor Unit Installation Guidelines; Install The Outdoor Unit; Connect the Piping; Connecting The Piping To Outdoor Unit; Gas Leak Checking
17 Outdoor Unit Installation Guidelines Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow, follow the installation guidelines below. For any of the below installation patterns, the wall height on the exhaust side should be 47-1/4" or less. 10.2 Install...
Page 18 - CUTTING AND FLARING THE PIPING; Evacuation of the Equipment
18 CUTTING AND FLARING THE PIPING 1 Please cut using pipe cutter and then remove the burrs. 2 Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. Turn the piping end down to avoid the metal powder entering the pipe. 3 Please make flare after inserting the flare nut ...
Page 20 - Control; Cooling Operation
20 11. Operation Control 11.1 Cooling Operation 11.1.1 Outdoor fan control When cooling operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below: 11.1.2 Annual Cooling control This control is to enable cooling operation when outdoor...
Page 21 - Heating Operation
21 11.2 Heating Operation 11.2.1 Outdoor fan control When heating operation is enabled, based on outdoor ambient temperature, fan motor control will be adjusted according to figure below: To improve the judgment accuracy, indoor room temperature sampling starts when any indoor unit has stopped c...
Page 22 - Simultaneous Operation Control; Types of operations modes which can be; Types of operation modes which cannot be
22 12. Simultaneous Operation Control 1 Operation modes which can be selected using the remote control unit: Automatic, Cooling, Soft Dry, Heating, e-ion operation mode. 2 Types of operations modes which can be performed simultaneously o Cooling operation and cooling, Soft Dry or e-ion operation o H...
Page 25 - Total Current Control
25 13.8 Deice Control When outdoor pipe temperature and outdoor air temperature is low, deice operation starts where indoor fan motor and outdoor fan motor stop, indoor unit horizontal vane close and operation LED blink with compressor ON. 13.9 Time Delay Safety Control (Restart Control) The com...
Page 27 - Mode
27 14. Servicing Mode 14.1 CU-2E18NBU 14.1.1 Pump 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....
Page 29 - Guide; Self Diagnosis Function
29 15. Troubleshooting Guide 15.1 Self Diagnosis Function The display screen of wireless remote control unit and the self-diagnosis LEDs (green) on the outdoor printed circuit board in the outdoor unit can be used to identify the location of the problem. Refer to the table below to identify and so...
Page 32 - Disassembly and Assembly Instructions; Outdoor Unit Removal Procedure; Removing the Cabinet Top Plate and Cabinet Front Plate; Remove the Control Board Cover and Particular Plates
32 WARNING 16. Disassembly and Assembly Instructions High Voltage are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with repair work. Failure to heed this caution may result in electric shocks. 16.1 Outdoor Unit Remov...
Page 33 - Removing the Propeller Fan and Fan Motor
33 16.1.3 Removing the Control P.C. Board 6 Remove the drip proof cover. 7 Disconnect the connectors (lead wires of the compressor, sensor, and others). 8 Remove the screw at the right side of the control box, and pull out the entire control box. 9 Release the control P.C. Board tab to remove the co...
Page 35 - Data; Operation Characteristics; Cooling Characteristic
35 17. Technical Data 17.1 Operation Characteristics 17.1.1 One Indoor Unit Operation Cooling Characteristic [Condition] Room temperature: 81°F (DBT), 66°F (WBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fc A) Indoor unit capacity: Cooling (2.8: CS-E9NKUAW), servic...
Page 37 - Piping Length Characteristic Cooling
37 Piping Length Characteristic Cooling [Condition] Room temperature: 81°F (DBT), 66°F (WBT) Operation condition: High fan speed Outdoor temperature: 95°F (DBT) Compressor Freq: Fc A) Indoor unit capacity: Cooling (2.8: CS-E9NKUAW), service mode frequency = 28Hz 2.500 2.600 2.700 2.800 2.900 3.000...
Page 39 - Heating Characteristic
39 Heating Characteristic [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Piping Length: 24.6ft Compressor Freq: Fh Heating overload protection: 38Hz (Outside air 75.2°F) A) Indoor unit capacity: Heating (2.8: CS-E9NKUAW), service mode frequency = 52Hz 88.200 93.200 98...
Page 41 - Piping Length Characteristic Heating
41 Piping Length Characteristic Heating [Condition] Room temperature: 68°F (DBT) Operation condition: High fan speed Outdoor temperature: 47°F (DBT), 43°F (WBT) Compressor Freq: Fh A) Indoor unit capacity: Heating (2.8: CS-E9NKUAW), service mode frequency = 52Hz 3.600 3.700 3.800 3.900 4.000 4.100...
Page 55 - Exploded View and Replacement Parts List
55 18. Exploded View and Replacement Parts List Note The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.