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Order No: PHAAM1111120A1
Outdoor Unit
CU-2E18NBU
Please file and use this manual together with the service manual for Model No. CS-E9NKUAW CS-E12NKUAW, Order No.
PHAAM1111087C1.
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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13.4 Electronic Parts Temperature Rise Protection 2 (Cool)......................................23 13.5 Cooling overload control (Cool)..................24 13.6 Heating overload control (Heat) .................24 13.7 Extreme Low Temperature Compressor low pressure protection control (Heat)..............24 13.8 Deice Control..............................................25 13.9 Time Delay Safety Control (Restart Control).........................................25 13.10 30 seconds Force O
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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 instruction
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18. For R410A models, when connecting the piping, do not use any existing (R22) pipes and flare nuts. Using such same may cause abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. Use only R410A materials. Thickness of copper pipes used with R410A must be more than 1/32". Never use copper pipes thinner than 1/32". It is desirable that the amount of residual oil is less than 0.0014 oz/32.8ft. 19. During installati
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2. Specifications 2.1 CU-2E18NBU Item Unit OUTDOOR UNIT Indoor Unit Combination 3.2kW + 3.2kW 1 Phase, 208 – 230V, 60Hz (Power supply from Power Source 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 kW 5.94 (2.11 ~ 7.20) Capacity BTU/h
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Item Unit OUTDOOR UNIT 3 3 Air Volume High m /min (ft/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) Indoor Operation Range Maximum °C (°F) 30 (86.0) — Heating Minimum °C (°F) 16 (60.8) — Maximum °C (°F) 43 (109.4) 26 (78.8) Cooling Minimum °C (°F) 16 (60.8) 11 (51.8) Outdoor Operation Range Maximum °C
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Moisture Indoor unit combination Cooling Capacity (kW) Input Power (W) Operation Current (A) Current (A) Removal Outdoor Unit Mode 208V 230V Volume Operation Class (kW) Rating Min ~ Max Rating Min ~ Max (L/h) 2.8 2.82 1.81 ~ 3.27 850 390 ~ 1020 4.5 4.1 0.5 One-room Cooling Operation 3.2 3.21 1.85 ~ 3.75 1000 390 ~ 1230 5.2 4.7 0.6 CU-2E18NBU 2.8 + 2.8 4.89 2.09 ~ 5.86 1450 390 ~ 1920 7.6 6.9 0.5 + 0.5 Two-room Cooling 2.8 + 3.2 4.89 2.10 ~ 5.86 1450 390 ~ 1870 7.6 6.9 0.5 + 0.6
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3. Dimensions 8
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4. Refrigeration Cycle Diagram 9
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5. Block Diagram 10
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6. Wiring Connection Diagram 11
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7. Electronic Circuit Diagram 12
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8. Printed Circuit Board 8.1 Main Printed Circuit Board 13
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8.2 Noise Filter Printed Circuit Board 8.3 Display Printed Circuit Board 14
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9. Installation Information 9.1 Check Points QUICK GUIDE PIPING AND ELECTRICAL SPECIFICATION Min. Min. total Piping size Indoor (ID) & Max. Addi- Power pipe pipe Outdoor (OD) Standard Max. from Max. tional OD-ID Capacity Refrige- length length Power supply units: Possible pipe Eleva- OD to total refri- connection (Btu/h) rant for for supply wire Gas Liquid Combination length tion each length ge- wire size size each ID additional Patterns ID unit rant unit gas Outdoor (OD): C
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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 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. Recom
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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. 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 by bolt n
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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 onto the copper pipes. 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 Connec
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10.5 Connect The Cable To The Outdoor Unit 1 Remove Control Board Cover (Metal) by loosening 2 screws. 2 Remove Valve Cover (Metal) by loosening 2 screws. 3 Remove Plugs. 4 Fix the conduit connectors to the knock out holes with lock-nuts, then secure them. 5 Connecting wire between indoor unit and outdoor unit should be UL listed or CSA approved 4 conductor wires minimum AWG16 in accordance with local electric codes. 6 Wire Connection to the power supply (208/230V 60Hz) through circ
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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 Annual Cooling control This control is to enable cooling operation when outdoor ambient temperature is low. Control start conditions: o Cooling operation is activated with compressor ON. o Outdoor ambient temperature is less than 59°F Control contents: o When the a
