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Order No: PHAAM1111121A1
Outdoor Unit
CU-2S18NBU-1
Please file and use this manual together with the service manual for Model No. CS-S9NKUW-1, CS-S12NKUW-1 Order No. PHAAM1111084C1
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
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12.12 Valve close detection control......................23 12.13 Compressor discharge high pressure protection control........................................23 13. Servicing Mode.................................................24 13.1 Pump Down Operation ...............................24 13.2 Test Operation............................................24 13.3 Wiring Error Check .....................................24 13.4 Power Save Mode ......................................25 13.5 Mode
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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. • The caution items stated here must be followed because these important contents are related to safety. The meaning of each indication used is as below. Incorrect installation or servicing due to ignoring of the instructi
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WARNING During pump down operation, stop the compressor before remove the refrigeration piping. (Removal of refrigeration piping while 20. compressor is operating and valves are opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.). After completion of installation or service, confirm there is no leakage of refrigerant gas. It may generate toxic gas when the refrigerant 21. contacts with fire. 22. Ventilate if the
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2. Specification Model Outdoor Unit CU-2S18NBU-1 Indoor Unit Combination 3.2kW + 3.2kW 1 Phase, 208-230V, 60Hz Power Source (Power supply from outdoor unit) kW 4.89 (2.10 ~ 5.86) Capacity BTU/h 16700 (7200 ~ 20000) Running Current A 7.6 - 6.9 Power Input kW 1.45 (0.39 ~ 1.84) Electrical Cooling Operation Data EER W/W 3.37 (5.38 ~ 3.18) BTU/hW 11.50 (18.45 ~ 10.85) Sound Pressure Level dB-A 48 Noise Sound Power Level dB 62 Maximum Current A 13.6 Starting Current A 7.8 Mi
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• Multi split combination possibility: o A single outdoor unit enables air conditioning of up to two separate rooms for CU-2S18NBU-1. Outdoor Unit CU-2S18NBU-1 A B 2.8 kW CS-S9NKUW-1 ● ● 3.2 kW CS-S12NKUW-1 ● ● Capacity range of connectable indoor units From 5.6 kW to 6.4 kW 1 room maximum pipe length (m (ft)) 25 (82.0) Allowable elevation (m (ft)) 15 (49.2) Total allowable pipe length (m (ft)) 50 (164.0) Total pipe length for maximum chargeless length (m (ft)) 20 (65.6) A
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3. Dimensions 7
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4. Refrigeration Cycle Diagram 8
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5. Block Diagram 9
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6. Wiring Connection Diagram 10
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7. Electronic Circuit Diagram 11
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8. Printed Circuit Board 8.1 Main Printed Circuit Board 12
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8.2 Noise Filter Printed Circuit Board 13
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9. Installation Information 9.1 Check Points QUICK GUIDE PIPING & ELECTRICAL SPECIFICATION Min. total Min. pipe Max. Piping size Standard Max. pipe Power OD-ID Indoor(ID) & Outdoor(OD) units: Capacity Max. length for from Additional Power Refrigerant pipe total length for supply connection Possible Combination Patterns (Btu/h) Elevation each ID OD to refrigerant supply length length additional wire size wire size unit each ID gas Gas Liquid Outdoor (OD): CU-2S18NBU-1 Indoor
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10. Installation Instruction 10.1 SELECT THE BEST LOCATION 10.1.1 OUTDOOR UNIT 10.1.2 Outdoor Unit Installation • If an awning is built over the unit to prevent direct Diagram 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 air discharged. • Keep the spaces indicated by arrows from wall, ceiling, fence or other obstacles. • Do not place any obstacles which may cause a sh
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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. 16
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10.2 INSTALL THE OUTDOOR UNIT • After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram. 1. Fix the unit on concrete or rigid frame firmly and horizontally with bolt nut (ø13/32"). 2. When installing on a roof, please consider strong winds and earthquakes. Please fasten the installation stand firmly with bolt or nails. Model A B C D CU-2S18*** 24-1/8" 5-5/32" 5/8" 14-3/16" 10.3 CONNECT THE PIPING • Remove the control board cover (resin)
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10.4 EVACUATION OF THE EQUIPMENT WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure. 1. Connect a charging hose with a push pin to the Low side of a charging set and the service port of the gas side 3-way valve. 2. Connect the micron gauge between vacuum pump and service port of outdoor units. 3. Turn on the power switch of the vacuum pump and make sure that connect digital micron gauge and to pull down to a va
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8. For wire stripping and connection requirement, refer to the diagram below. 9. Secure the power supply cord and connecting cables onto the control board with the holder. 10. Attach the control board cover (metal and resin) and valve cover back to the original position with screw. 10.6 HEAT INSULATION Use a material with good heat-resistant properties as the heat insulation for Liquid-side pipes Material shall the pipes. Be sure to insulate both the gas-side and liquid-side
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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 Powerful Operation 1 • During cooling operation, this control is to concentrate outdoor unit capability to the powerful operation enabled indoor unit by temporary stop the capability supply to low load demand indoor units. • Operation start condition: o Powerful operati
