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.
12.12 Valve close detection control......................23 12.13 Compressor discharge high pressure protection control ........................................23 13. Servicing Mode .................................................24 13.1 13.2 13.3 13.4 13.5 Pump Down Operation ...............................24 Test Operation............................................24 Wiring Error Check .....................................24 Power Save Mode ......................................
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.
WARNING 20. 21. During pump down operation, stop the compressor before remove the refrigeration piping. (Removal of refrigeration piping while 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 contacts with fire. 22.
2. Specification Model Outdoor Unit CU-2S18NBU-1 Indoor Unit Combination 3.2kW + 3.2kW Power Source 1 Phase, 208-230V, 60Hz (Power supply from outdoor unit) Capacity kW 4.89 (2.10 ~ 5.86) BTU/h 16700 (7200 ~ 20000) Running Current A 7.6 - 6.9 Power Input kW 1.45 (0.39 ~ 1.84) EER W/W 3.37 (5.38 ~ 3.18) BTU/hW 11.50 (18.45 ~ 10.85) Sound Pressure Level dB-A 48 Sound Power Level dB 62 Maximum Current A 13.6 Starting Current A 7.
• Multi split combination possibility: o A single outdoor unit enables air conditioning of up to two separate rooms for CU-2S18NBU-1. Outdoor Unit Wall CU-2S18NBU-1 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)) Piping Length A 25 (82.0) Allowable elevation (m (ft)) 15 (49.2) Total allowable pipe length (m (ft)) 50 (164.
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8. Printed Circuit Board 8.
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9. Installation Information 9.1 Check Points QUICK GUIDE PIPING & ELECTRICAL SPECIFICATION Indoor(ID) & Outdoor(OD) units: Possible Combination Patterns Capacity Refrigerant (Btu/h) Piping size Gas Liquid ø3/8" (ø9.52mm) ø1/4" (ø6.35mm) Min. pipe Max. Standard Max. length for from pipe Elevation each ID OD to length unit each ID Max. total length Min.
10. Installation Instruction 10.1 SELECT THE BEST LOCATION 10.1.1 • • • • • OUTDOOR UNIT 10.1.2 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 air discharged. Keep the spaces indicated by arrows from wall, ceiling, fence or other obstacles. Do not place any obstacles which may cause a short circuit of the discharged air.
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 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.
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 value of 500 microns. 4.
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 CAUTION Use a material with good heat-resistant properties as the heat insulation for the pipes. Be sure to insulate both the gas-side and liquid-side pipes.
11. Operation Control 11.1 Cooling Operation 11.1.1 • 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 operation ON for targeted indoor unit.
12. Protection Control 12.1 • • When received freeze prevention signal from indoor unit, the compressor frequency changes according to indoor heat exchanger temperature. When indoor unit request capability OFF due to freeze condition , immediately the capability supply to targeted indoor unit stops. 12.
12.5 Cooling overload control (Cool) • This control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling operation. 12.6 Time Delay Safety Control (Restart Control) • • The compressor will not restart within three minutes after compressor is stopped. This control is not applicable if the power supply reset. 12.
12.10 Compressor Protection Control (Gas leak detection control 1) • • Control start conditions o For 5 minutes, the compressor continuously operates and total current is low. o During Cooling or Soft Dry operation: Indoor intake temperature — indoor piping temperature is below 39.2°F. Control content o Compressor stops (and restart after 3 minutes) o If the conditions above happen 4 times within 60 minutes, the unit will stop operation (“F91” is indicated). 12.
13. Servicing Mode 13.1 Pump Down Operation Operate the pump down according to the following procedures. 1 Confirm the valve on the liquid side and gas side is open. 2 Press PUMP DOWN switch (SW1) on the display printed circuit board for more than 5 seconds. Pump down (cooling) operation is performed for 15 minutes. 3 Set the liquid side 3 way valve to close position and wait until the pressure gauge indicates 1.45 PSI.
NOTE 1. 2. 3. 4. 5. For two rooms, LED 4 and 5 are not illuminated after wiring operation complete. If the outdoor air temperature is less than 41°F or unit has abnormality, wiring operation will not start. After wiring check operation is complete, LED indication will illuminated until normal operation starts. Follow the product diagnosis procedure. (Check the diagnostic label at the control board cover.) When LED 1 only illuminate, indicates that outdoor unit is operating normally. 13.
14. Troubleshooting Guide 14.1 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 solve the cause of the problem, and then re-start the air conditioner system. If the problem is solved and operation returns to normal. LED 1 illuminates and others LED are off.
Diagnosis display Abnormality or Protection control H98 Indoor high pressure protection ○ ○ ○ H99 Indoor operating unit freeze protection ○ ○ ○ F11 4-way valve switching abnormality ○ ○ ○ F17 F90 F91 F93 F94 F95 F96 F97 Indoor standby units freezing abnormality Power factor correction (PFC) circuit protection Refrigeration cycle abnormality Compressor abnormal revolution Compressor discharge pressure overshoot protection Outdoor cooling high pressure protection Power transistor modu
15. Disassembly and Assembly Instructions WARNING High Voltages 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. 15.1 Outdoor Unit Removal Procedure Caution! When handling electronic controller, be careful of electrostatic discharge. 15.1.1 Removing the Cabinet Top Plate and Cabinet Front Plate 1.
15.1.3 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 control P.C. Board. 15.1.4 Removing the Propeller Fan and Fan Motor 1. Follow the steps in 15.1.1 for removing the cabinet top plate and cabinet front plate. 2.
3. Disconnect the fan motor connector from the control P.C. Board. 4. Loosen the 4 fan motor mounting screws then remove the fan motor.
16. Technical Data 16.1 Operation Characteristics 16.1.1 • CS-S9NKUW-1 CU-2S18NBU-1 Cooling Characteristic o Room temperature: o Operation condition: o Piping length: o Compressor Freq: 81°F (DBT), 66°F (WBT) High fan speed 24.
• Piping Length Characteristic o Room temperature: 81°F (DBT), 66°F (WBT) o Operation condition: High fan speed o Outdoor temperature: 95°F (DBT) o Compressor Freq: Fc 32
16.1.2 • CS-S9NKUW-1x2 CU-2S18NBU-1 Cooling Characteristic o Room temperature: o Operation condition: o Piping length: o Compressor Freq: 81°F (DBT), 66°F (WBT) High fan speed 24.
• Piping Length Characteristic o Room temperature: 81°F (DBT), 66°F (WBT) o Operation condition: High fan speed o Outdoor temperature: 95°F (DBT) o Compressor Freq: Fc 34
16.1.3 • CS-S12NKUW-1 CU-2S18NBU-1 Cooling Characteristic o Room temperature: o Operation condition: o Piping length: o Compressor Freq: 81°F (DBT), 66°F (WBT) High fan speed 24.
• Piping Length Characteristic o Room temperature: 81°F (DBT), 66°F (WBT) o Operation condition: High fan speed o Outdoor temperature: 95°F (DBT) o Compressor Freq: Fc 36
16.1.4 • CS-S12NKUW-1x2 CU-2S18NBU-1 Cooling Characteristic o Room temperature: o Operation condition: o Piping length: o Compressor Freq: 81°F (DBT), 66°F (WBT) High fan speed 24.
• Piping Length Characteristic o Room temperature: 81°F (DBT), 66°F (WBT) o Operation condition: High fan speed o Outdoor temperature: 95°F (DBT) o Compressor Freq: Fc 38
16.1.5 • CS-S12NKUW-1+CS-S9NKUW-1 CU-2S18NBU-1 Cooling Characteristic o Room temperature: o Operation condition: o Piping length: o Compressor Freq: 81°F (DBT), 66°F (WBT) High fan speed 24.
• Piping Length Characteristic o Room temperature: 81°F (DBT), 66°F (WBT) o Operation condition: High fan speed o Outdoor temperature: 95°F (DBT) o Compressor Freq: Fc 40
17. 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.
REF. NO. DESCRIPTION & NAME QTY.
REF. NO. DESCRIPTION & NAME QTY. CU-2S18NBU-1 69 SHOCK ABSORBER (LEFT) 1 CWG712880 70 C.C.CASE 1 CWG565609 76 TERMINAL COVER 1 CWH171035 77 NUT - TERMINAL COVER 2 CWH7080300J REMARK (Note) • All parts are supplied from PHAAM, Malaysia (Vendor Code: 00029488). • “O” marked parts are recommended to be kept in stock.
