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Fujitsu ASUH18LMAS Design & Technical Manual
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Fujitsu ASUH18LMAS Design & Technical Manual

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AIR CONDITIONER
Wall mounted type
DESIGN & TECHNICAL MANUAL
INDOOR
OUTDOOR
ASUH18LMAS
AOUH18LMAS1
AOUH24LMAS1
ASUH24LMAS
DR_AS143EF_01
2021.11.01

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Summary of Contents for Fujitsu ASUH18LMAS

  • Page 1 AIR CONDITIONER Wall mounted type DESIGN & TECHNICAL MANUAL INDOOR ASUH18LMAS ASUH24LMAS OUTDOOR AOUH18LMAS1 AOUH24LMAS1 DR_AS143EF_01 2021.11.01...
  • Page 2 • Product specifications and design are subject to change without notice for future improvement. • For further details, please check with our authorized dealer. Trademarks ™ FGLair is trademark of Fujitsu General Limited in the United States, other countries or both. ™ Google Play is trademark of Google Inc. ®...

  • Page 3: Table Of Contents

    1. Specifications....................2 2. Dimensions....................4 2-1. Model: ASUH18LMAS ....................4 2-2. Model: ASUH24LMAS .....................6 3. Wiring diagrams ....................8 3-1. Models: ASUH18LMAS and ASUH24LMAS ..............8 4. Capacity table....................9 4-1. Cooling capacity.......................9 4-2. Heating capacity ......................11 5. Fan performance ..................12 5-1. Air velocity distributions....................12 5-2.
  • Page 4 CONTENTS (continued) Part 2. OUTDOOR UNIT..............67 1. Specifications....................68 2. Dimensions....................69 2-1. Models: AOUH18LMAS1 and AOUH24LMAS1 .............69 3. Installation space ..................70 3-1. Models: AOUH18LMAS1 and AOUH24LMAS1 .............70 4. Refrigerant circuit ..................74 4-1. Models: AOUH18LMAS1 and AOUH24LMAS1 .............74 5. Wiring diagrams ..................75 5-1.

  • Page 5: Part 1. Indoor Unit

    Part 1. INDOOR UNIT WALL MOUNTED TYPE: ASUH18LMAS ASUH24LMAS...

  • Page 6: Specifications

    1. Specifications Wall mounted Type Inverter heat pump Model name ASUH18LMAS ASUH24LMAS Power supply 208/230 V ~ 60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V 5.28 6.45 Rated Btu/h 18,000 22,000 Cooling 2.05—5.86 2.67—8.00 Min.—Max. Btu/h 7,000—20,000...
  • Page 7 Wall mounted Type Inverter heat pump Model name ASUH18LMAS ASUH24LMAS NOTES: • Specifications are based on the following conditions: – Cooling: Indoor temperature of 80°FDB (26.67°CDB) /67°FWB (19.44°CWB), and outdoor temperature of 95°FDB (35°CDB) / 75°FWB (23.9°CWB). – Heating: Indoor temperature of 70°FDB (21.11°CDB) /59°FWB (15.56°CWB), and outdoor temperature of 47°FDB (8.33°CDB) /43°FWB (6.11°CWB).

  • Page 8: Dimensions

    2. Dimensions 2-1. Model: ASUH18LMAS Unit: in (mm) 38-9/16 (980) 9-7/16 (240) 16-7/16 (417) 19 (482) 20-1/16 (510) 3-1/16 16-1/4 (413) 15-3/4 (400) 3-9/16 (77) (90) Outline of indoor unit for pipe inlet for pipe inlet Ø3-1/8 (80) Ø3-1/8 (80)
  • Page 9 Unit: in (mm) 2 (40) or more Wall hook bracket 3 (70) or more 5 (117) or more Outline of the indoor unit 7 (160) or more 60 (1,500) or more - 5 - 2-1. Model: ASUH18LMAS 2. Dimensions...

  • Page 10: Model: Asuh24Lmas

    2-2. Model: ASUH24LMAS Unit: in (mm) 45-1/4 (1,150) 13-6/16 (340) 19 (483) 11 (280) 21-7/16 (544) 22-1/16 (560) 45-1/4 (1,150) 20-1/2 (520) 20-1/2 (520) 13/16 (20) 3-9/16 (90) Outline of unit 2-1/2 (64) 10/16 (16) 13-6/16 (340) 1-15/16 (50) 1-15/16 (50) 4-1/4 7/16 (11) 2-6/16 (61)
  • Page 11 ¢ Installation space requirement Provide sufficient installation space for product safety. CAUTION Do not place any other electrical products or household belongings under the product. Conden- sation dripping from the product might get them wet, and may cause damage or malfunction to the property.

  • Page 12: Wiring Diagrams

    3. Wiring diagrams 3-1. Models: ASUH18LMAS and ASUH24LMAS - 8 - 3-1. Models: ASUH18LMAS and ASUH24LMAS 3. Wiring diagrams...

  • Page 13: Capacity Table

    Airflow Rate (AFR): For cooling capacity: Total Capacity (TC), Sensible Heat Capacity (SHC), and Input Power (IP) For heating capacity: Total Capacity (TC) and Input Power (IP) 4-1. Cooling capacity ¢ Model: ASUH18LMAS Indoor temperature °FDB °FWB °FDB...
  • Page 14 ¢ Model: ASUH24LMAS Indoor temperature °FDB °FWB °FDB kBtu kBtu kBtu kBtu kBtu kBtu 19.67 10.96 0.94 21.52 12.00 0.95 23.58 13.15 0.97 24.31 13.55 0.98 25.91 14.44 0.99 27.62 15.39 1.00 17.85 10.16 1.25 19.54 11.12 1.26 21.41 12.18 1.29 22.07 12.56...

  • Page 15: Heating Capacity

    4-2. Heating capacity NOTE: Values mentioned in the table are calculated based on the maximum capacity. ¢ Model: ASUH18LMAS Indoor temperature °FDB °FDB °FWB kBtu kBtu kBtu kBtu kBtu 22.79 3.02 22.20 3.08 21.60 3.15 21.00 3.21 20.41 3.27 24.47 2.96...

  • Page 16: Fan Performance

    5. Fan performance 5-1. Air velocity distributions ¢ Model: ASUH18LMAS Fan speed Operation mode Measuring conditions HIGH (ft) Unit: ft/s (m/s) Top view 7 (2.0) 3 (1.0) 2 (0.5) Vertical airflow direction louver: Up Horizontal airflow direction louver: Center (ft)
  • Page 17 ¢ Model: ASUH24LMAS Fan speed Operation mode Measuring conditions HIGH Unit: m/s Top view Vertical airflow direction louver: Up Horizontal airflow direction louver: Center Unit: m/s Top view Vertical airflow direction louver: Up Horizontal airflow direction louver: Left & Right Unit: m/s Side view Vertical airflow direction louver: Up...

  • Page 18: Airflow

    5-2. Airflow ¢ Model: ASUH18LMAS  Cooling Fan speed Airflow HIGH QUIET  Heating Fan speed Airflow 1,000 HIGH QUIET - 14 - 5-2. Airflow 5. Fan performance...
  • Page 19 ¢ Model: ASUH24LMAS  Cooling Fan speed Airflow 1,100 HIGH QUIET  Heating Fan speed Airflow 1,240 HIGH QUIET - 15 - 5-2. Airflow 5. Fan performance...

  • Page 20: Operation Noise (Sound Pressure)

    6. Operation noise (sound pressure) 6-1. Noise level curve ¢ Model: ASUH18LMAS  Cooling  Heating NC-65 NC-65 NC-60 NC-60 NC-55 NC-55 HIGH HIGH NC-50 NC-50 NC-45 NC-45 NC-40 NC-40 NC-35 NC-35 NC-30 NC-30 NC-25 NC-25 QUIET NC-20 QUIET NC-20...

  • Page 21: Sound Level Check Point

    6-2. Sound level check point Microphone Microphone 40 in (1 m) NOTE: Detailed shape of the actual indoor unit might be slightly different from the one illustrated above. - 17 - 6-2. Sound level check point 6. Operation noise (sound pressure)

  • Page 22: Safety Devices

    7. Safety devices Model Type of Protection form protection ASUH18LMAS ASUH24LMAS Circuit Current fuse (PCB*) 250 V, 3.15 A protection 257±18°F (125±10°C) Activate Fan motor stop Fan motor Thermal protection protection 212±18°F (100±10°C) Reset Fan motor restart *PCB: Printed Circuit Board - 18 - 7.

  • Page 23: External Input And Output

    8. External input and output External input and output PCB Indoor unit PCB CN47 (Ext. out) CN65 (Ext. in/out PCB) CN46 (Ext. in) SW301 SW302 Rotary switch CN314 CN313 CN312 CN311 CN310 CN308 Input External input External output Connector Input select signal Operation/Stop —...

  • Page 24: External Input

    8-1. External input With using external input function, some functions on this product can be controlled from an external device. • “Operation/Stop” mode or "Forced stop" mode can be selected with function setting of indoor unit. • A twisted pair cable (22AWG) should be used. Maximum length of cable is 492 ft (150 m). •...
  • Page 25 ¢ External input and output PCB The indoor unit Operation/Stop can be set by using the input connector on the PCB. • Input select: Use either one of these types of connectors according to the application. (Both types of connec- tors cannot be used simultaneously.) –...

  • Page 26: External Output

    8-2. External output Use an external output cable with appropriate external dimension, depending on the number of ca- bles to be installed. ¢ Indoor unit • A twisted pair cable (22AWG) should be used. Maximum length of cable is 82 ft (25 m). •...
  • Page 27 ¢ External input and output PCB • A twisted pair cable (22AWG) should be used. Maximum length of cable is 82 ft (25 m). • Output voltage: High DC 12 V±2 V, Low 0 V. • Permissible current: 50 mA •...

  • Page 28: Combination Of External Input And Output

    8-3. Combination of external input and output By combining the function setting of the indoor unit and rotary switch setting of the External input and output PCB, you can select various combinations of functions. Combination examples of external input and output are as follows: External input Indoor unit External input and output PCB...
  • Page 29 External output Indoor unit External input and output PCB Function Rotary Mode setting CN47 CN310 CN311 CN312 Indoor unit fan 60-00 Operation/Stop Operation/Stop Error status operation status Indoor unit fan External heater 60-00 Operation/Stop Error status operation status output Cooling Indoor unit fan External heater 60-01...

  • Page 30: Details Of Function

    8-4. Details of function ¢ Control input function • When function setting is “Operation/Stop” mode 1 – In the case of “Edge” input: Function Rotary SW on External External input Input signal Command setting input and output PCB Off → On Operation External input and 46-00...
  • Page 31 • When function setting is “Forced stop” mode – In the case of “Edge” input: Function Rotary SW on External External input Input signal Command setting input and output PCB Off → On Forced stop External input and 46-02 CN313 output PCB On →...
  • Page 32 • When function setting is “Operation/Stop” mode 2 – In the case of “Edge” input: Function Rotary SW on External External input Input signal Command setting input and output PCB Off → On Operation External input and 46-03 CN313 Stop (R.C. output PCB On →...
  • Page 33 • Forced thermostat off function Rotary SW on Input Function setting / External input External input Command signal and output PCB 60-00 / 2 Thermostat Off → On 60-09 / B External input and 60-10 / C CN313 output PCB Normal 60-11 / D On →...
  • Page 34 • Error status Rotary SW on Output Function setting / External input External output Command signal and output PCB Off → On Error 60-09 / B Output of indoor unit CN47 On → Off Normal Off → On Error 60-00 / 2 CN310 On →...
  • Page 35 • External heater output Rotary SW on Output Function setting / External input External output Command signal and output PCB Off → On Heater on 60-11 / D Output of indoor unit CN47 On → Off Heater off 60-00 / 2 Off →...
  • Page 36 ¢ External heater output Function setting Indoor unit Wired R. C. Control Primary heater Auxiliary heater Control switching external heaters Sensor activation* No. 61 Auxiliary heater Heat pump 61-00 — External device* control 1 Auxiliary heater Heat pump External device 61-01 —...
  • Page 37 • Inappropriate designing and installation of external heater may cause a fire by emitted heat from the external heater. • Fujitsu General Ltd. is not responsible for inappropriate designing or installation of external heating device.  Auxiliary heater control 1...
  • Page 38  Heat pump prohibition control Perform heating by external heater only. Indoor unit is continuous thermostat off. Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. •...
  • Page 39  Auxiliary heater control by outdoor temperature 1 This control selects heat pump or external heater according to the outdoor temperature. When out- door temperature is high, the heating is performed by using heat pump only. Operation Condition Heater on Heater is on as shown in following diagram of heating temperature.
  • Page 40 • Operation status 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Heat pump Heat pump Combination zone prohibition only zone Outdoor temperature zone * zone Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 41  Auxiliary heater control by outdoor temperature 2 This control selects heat pump or external heater according to the outdoor temperature. Even when outdoor temperature is high, the heating is performed by using both of heat pump and external heater. Operation Condition Heater on...
  • Page 42 • Operation status 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Heat pump Combination zone Outdoor temperature zone * prohibition zone Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 43  Auxiliary heater control by outdoor temperature 3 This control selects heat pump or external heater according to the outdoor temperature. Even when outdoor temperature is high, the heating is performed by using both of heat pump and external heater. Operation Condition Heater on...
  • Page 44 • Operation status Heat pump only zone 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Combination zone Outdoor temperature zone * Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 45  Auxiliary heat pump control • External heater output Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. • Other than heating mode Heater off •...
  • Page 46  Auxiliary heat pump control by outdoor temperature 1 • External heater output Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. •...
  • Page 47 • Operation status 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Heat pump Combination zone Outdoor temperature zone * prohibition zone Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 48  Auxiliary heat pump control by outdoor temperature 2 • External heater output Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. •...
  • Page 49 • Operation status Heat pump prohibition zone 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Combination zone Outdoor temperature zone * Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 50  Auxiliary heat pump control by outdoor temperature 3 • External heater output Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. •...
  • Page 51 • Operation status Heat pump prohibition zone 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Combination zone Outdoor temperature zone * Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 52 ¢ Heating thermostat on for humidifier Indoor unit Function External output setting Situation Mode Rotary SW Heating Indoor unit fan Heating thermostat on operation thermostat on no. 60 status 60-05 CN47 Example of 60-06 CN312 individual Not used 60-07 CN311 connection 60-08 CN310...

  • Page 53: Group Connection

    9. Group connection NOTE: Group control cannot be used together with Wireless LAN adapter. Installation procedure for group control system: A number of indoor units can be operated at the same time using a single remote controller. NOTE: When different type of indoor units (such as wall-mounted type and cassette type, cassette type and duct type, or other combinations) are connected using group control system, some functions may no longer be available.

  • Page 54: Remote Controller

    10. Remote controller 10-1. Wireless remote controller ¢ Overview Signal transmitter MODE button FAN button MIN. HEAT button SWING button ECONOMY button TEMP. button SET button POWERFUL button Start/Stop button TIMER SETTING button SELECT button RESET button SLEEP button TEST RUN button CANCEL button CLOCK ADJUST button NOTE: Functions may differ by type of the indoor unit.
  • Page 55 ¢ Specifications  Controller Unit: in (mm) Top view 11/16 2-3/8 (17) (61) Front view Side view Size (H × W × D) in (mm) 8-1/16 × 2-3/8 × 11/16 (205 × 61 × 17) Weight oz (g) 4.4 (124) (without batteries) ...

  • Page 56: Function Settings

    11. Function settings To adjust the functions of this product according to the installation environment, various types of function settings are available. NOTE: Incorrect settings can cause a product malfunction. 11-1. Function settings by using remote controller Some function settings can be changed on the remote controller. After confirming the setting proce- dure and the content of each function setting, select appropriate functions for your installation envi- ronment.
  • Page 57 NOTES: • The air conditioner custom code is set to prior to shipment. • If you do not know the air conditioner custom code setting, try each of the custom codes ( → → → ) until you find the code that operates the air conditioner. - 53 - 11-1.
  • Page 58 ¢ Contents of function setting Each function setting listed in this section is adjustable in accordance with the installation environ- ment. NOTE: Setting will not be changed if invalid numbers or setting values are selected.  Function setting list Function no. Functions Filter sign 30/31...
  • Page 59 2) Room temperature control for indoor unit sensor NOTE: Before performing this setting, refer to Function 95. Depending on the installed environment, correction of the room temperature sensor may be re- quired. Select the appropriate control setting according to the installed environment. The temperature of the room temperature sensor is corrected as follows: Corrected temp.
  • Page 60 3) Room temperature control for wired remote controller sensor NOTE: Before performing this setting, refer to Function 95. Depending on the installed environment, correction of the wire remote temperature sensor may be required. Select the appropriate control setting according to the installed environment. To change this setting, set Function 42 to “Both“...
  • Page 61 6) Remote controller custom code (Only for wireless remote controller) The indoor unit custom code can be changed. Select the appropriate custom code. Function number Setting value Setting description Factory setting ♦ 7) External input control "Operation/Stop" mode or "Forced stop" mode can be selected. Function number Setting value Setting description...
  • Page 62 10) Switching functions for external output terminal Functions of the external output terminal can be switched. For details, refer to “External input and output”. Function number Setting value Setting description Factory setting Operation status ♦ 01—04 Cooling thermostat On Heating operation Operation/Stop 07—08 Cooling thermostat On...
  • Page 63 13) Outdoor temperature zone boundary temperature A Setting required if changing of the outdoor temperature setting for heat pump prohibition zone is re- quired when auxiliary heater control by outdoor temperature 1 and 2 are performed on the indoor unit. For details, refer to “External heater output” in Chapter 8-4. "Details of function"...
  • Page 64 16) Heat pump backup setting Enables or disables the heat pump backup instruction from the outdoor unit. This function will be usable provided that the corresponding outdoor unit is connected. Function number Setting value Setting description Factory setting Disable ♦ Enable 17) Emergency heat for external output terminal Enables or disables emergency heat input.

  • Page 65: 11-2.Custom Code Setting For Wireless Remote Controller

    11-2. Custom code setting for wireless remote controller To interconnect the air conditioner and the wireless remote controller, assignment of the custom code for the wireless remote controller is required. NOTE: Air conditioner cannot receive a signal if the air conditioner has not been set for the custom code.

  • Page 66: 11-3.Switching The Temperature Unit Of Remote Controller

    11-3. Switching the temperature unit of remote controller Displayed temperature unit on the remote controller LCD can be switched between °F (Fahrenheit) and °C (Celsius). To change temperature unit, do as follows: Press the TEMP. (Up) button ( ) for at least 5 seconds to display the current temperature unit. (Factory setting: °F) Press the TEMP.

  • Page 67: Accessories

    12. Accessories 12-1. Model: ASUH18LMAS Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Tapping screw (large) Installation manual Tapping screw (small) Remote controller Battery Remote controller Filter holder holder Cloth tape Air cleaning filters Wall hook bracket - 63 - 12-1.

  • Page 68: 12-2.Model: Asuh24Lmas

    12-2. Model: ASUH24LMAS Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Drain hose insulation Installation manual Cloth tape Wall hook bracket Tapping screw (large) Remote controller Tapping screw (small) Battery Air cleaning filters Remote controller Filter holder holder - 64 - 12-2.

  • Page 69: Optional Parts

    13. Optional parts 13-1. Controllers Exterior Part name Model name Summary Easy finger touch operation with LCD panel. Backlit LCD enables easy operation in a dark room. Wire type: Non-polar 2-wire Optional communication kit is necessary for installation. NOTE: When this remote controller is connected, wireless remote controller cannot be Office...

  • Page 70: 13-2.Others

    FGL sales company. For connection between indoor unit Modbus UTY-VMSX with UART interface and a Modbus converter open network. This converter can control Fujitsu Thermostat UTY-TTRX General products using a third-party converter thermostat controller. This converter is required when...

  • Page 71: Part 2. Outdoor Unit

    Part 2. OUTDOOR UNIT SINGLE TYPE: AOUH18LMAS1 AOUH24LMAS1...

  • Page 72: Specifications

    1. Specifications Type Inverter heat pump Model name AOUH18LMAS1 AOUH24LMAS1 Power supply 208/230 V ~ 60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V Starting current Cooling 1,683 (2,860) 1,936 (3,290) Airflow rate CFM (m Heating 1,742 (2,960) 2,187 (3,715) Type ×...

  • Page 73: Dimensions

    2. Dimensions 2-1. Models: AOUH18LMAS1 and AOUH24LMAS1 Unit: in (mm) 5-13/16 25-9/16 (650) 5-5/8 (147) (143) 3-way valve (Gas) 3-way valve (Liquid) 1-1/4 (48) Liquid Top view Detail A Detail B 12-5/8 (320) 37 (940) 1-9/16 (40) 9/16 (14) 2-Ф7/8 (22) Cable port 2-Ф7/8 (22) Cable port...

  • Page 74: Installation Space

    3. Installation space 3-1. Models: AOUH18LMAS1 and AOUH24LMAS1 ¢ Space requirement Provide sufficient installation space for product safety. CAUTION Keep the space shown in the installation examples. If the installation is not performed accordingly, it could cause a short circuit and result in a lack of operating performance.
  • Page 75 • When an obstruction in the upper space: Unit: in (mm) When there are obstacles at the rear When there are obstacles at the rear, sides, and and above. above. Max. 19 Max. 19 (500) (500) 40 (1,000) or more 40 (1,000) or more 20 (500)
  • Page 76  Multiple outdoor unit installation • Provide at least 250 mm of space between the outdoor units if multiple units are installed. • When routing the piping from the side of an outdoor unit, provide space for piping. • No more than 3 units must be installed side by side. When 4 units or more are arranged in a line, provide the space as shown in the following ex- ample “When an obstruction in the upper space:”.
  • Page 77  Outdoor unit installation in multi-row Unit: in (mm) Single parallel unit arrangement Multiple parallel unit arrangement 6 (150) or more 20 (500) or more 119 (3,000) or more 138 (3,500) or more 24 (600) or more 24 (600) or more 60 (1,500) or more 60 (1,500) or more 10 (250) or more...

  • Page 78: Refrigerant Circuit

    4. Refrigerant circuit 4-1. Models: AOUH18LMAS1 and AOUH24LMAS1 Heat exchanger 3-way 3-way (INDOOR) valve valve Pressure switch 4-way valve Strainer Expansion valve Strainer Heat exchanger (OUTDOOR) : Cooling : Heating : Thermistor (Compressor temperature) : Thermistor (Discharge temperature) : Thermistor (Heat Exchanger Med temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat Exchanger Out temperature) : Thermistor (Pipe temperature)

  • Page 79: Wiring Diagrams

    5. Wiring diagrams 5-1. Models: AOUH18LMAS1 and AOUH24LMAS1 - 75 - 5-1. Models: AOUH18LMAS1 and AOUH24LMAS1 5. Wiring diagrams...

  • Page 80: Capacity Compensation Rate For Pipe Length And Height Difference

    6. Capacity compensation rate for pipe length and height difference Height difference H Indoor unit is higher than outdoor unit Indoor unit is lower than outdoor unit Outdoor unit Indoor unit Outdoor unit Indoor unit Connection pipe Connection pipe 6-1. Models: AOUH18LMAS1 and AOUH24LMAS1 NOTE: Values mentioned in the table are calculated based on the maximum capacity.

  • Page 81: Additional Charge Calculation

    7. Additional charge calculation 7-1. Model: AOUH18LMAS1 Refrigerant type R410A lb oz 3 lb 15 oz Factory charge amount 1,800 ¢ Refrigerant charge 49 or less 165 (Max.) Total pipe length 15 or less 50 (Max.) 0.43 oz/ft (40 g/m) lb oz 7 oz 1 lb 5 oz...

  • Page 82: Airflow

    8. Airflow 8-1. Model: AOUH18LMAS1  Cooling Airflow 2,860 1,683  Heating Airflow 2,960 1,742 8-2. Model: AOUH24LMAS1  Cooling Airflow 3,290 1,936  Heating Airflow 3,715 1,032 2,187 - 78 - 8-1. Model: AOUH18LMAS1 8. Airflow...

  • Page 83: Operation Noise (Sound Pressure)

    9. Operation noise (sound pressure) 9-1. Noise level curve ¢ Model: AOUH18LMAS1  Cooling  Heating NC-65 NC-65 NC-60 NC-60 NC-55 NC-55 NC-50 NC-50 NC-45 NC-45 NC-40 NC-40 NC-35 NC-35 NC-30 NC-30 NC-25 NC-25 NC-20 NC-20 NC-15 NC-15 1,000 2,000 4,000 8,000 1,000...

  • Page 84: Sound Level Check Point

    9-2. Sound level check point Rear Microphone Microphone Airflow 40 in (1 m) Side view Rear view NOTE: Detailed shape of the actual outdoor unit might be slightly different from the one illustrated above. - 80 - 9-2. Sound level check point 9.

  • Page 85: Electrical Characteristics

    10. Electrical characteristics Model name AOUH18LMAS1 AOUH24LMAS1 Voltage 208/230 Power supply Frequency 17.1 19.6 MCA * Starting current MAX. CKT. BKR * Power cable Wiring spec. Size Connection Limited wiring cable * ft (m) 167 (51) length : Minimum Circuit Ampacity (Calculation based on UL60335-2-40) : Selected sample based on Japan Electrotechnical Standards and Codes Committee E0005.

  • Page 86: Safety Devices

    11. Safety devices Model Type of Protection form protection AOUH18LMAS1 AOUH24LMAS1 250 V, 20 A Circuit Current fuse (Main PCB) 250 V, 3.15 A protection 250 V, 10 A × 2 251.6 ±16.2°F (122 ±9°C) Activate Fan motor stop Fan motor Thermal protection +18.0 protection...

  • Page 87: External Input And Output

    12. External input and output With using external input and output functions, this product can be operated inter-connectedly with an external device. Connector Input Output Remarks P580 Low noise mode — PA580 Peak cut mode — See external input/output settings for details.
  • Page 88 ¢ Peak cut mode By performing following on-site work, operation that suppresses the current value can be enabled: The air conditioner is set to the “Peak cut mode” when closing the contact input of a commercial timer or on/off switch to a connector on the control PCB of the outdoor unit. •...

  • Page 89: 12-2.External Output

    12-2. External output With using external output function, some status signals are transmitted to the control PCB, and the related LED lamp indicates the status of this product. ¢ Error status output Signal on air conditioner error status is generated when a malfunction occurs. •...
  • Page 90 ¢ Compressor status output Signal on compressor operation status is generated when the compressor is running. • Circuit diagram example • Output voltage (Vcc): DC 12 V Outdoor unit 50 mA or less control PCB Connected unit (Locally purchased) • *: Make the distance from the Example: Connector Example: Fan...

  • Page 91: Function Settings

    13. Function settings Perform appropriate function setting locally according to the installation environment. NOTE: Incorrect settings can cause a product malfunction. CAUTION • Before setting up the switch buttons, discharge the static electricity from your body. • Never touch the terminals or the patterns on the parts that are mounted on the PCB. 13-1.
  • Page 92 ¢ Switch buttons and the functions LED lamps S134 S133 S132 S131 S130 Switch buttons LED lamp Function or operation method Lights on while power on. (1) POWER/MODE Green Local setting in outdoor unit or error code is displayed with blink. (2) ERROR Blinks during error operation.

  • Page 93: 13-2.Local Setting Procedure

    13-2. Local setting procedure NOTE: Before performing the function setting, be sure to stop the operation of the air conditioner. ¢ Low noise mode Press the MODE switch button (S134) for 3 seconds or more to switch to “Local setting mode”. After confirming the LED lamp of POWER/MODE blinks 9 times, press the ENTER switch but- ton (S132).
  • Page 94 ¢ Peak cut mode Press the MODE switch button (S134) for 3 seconds or more to switch to “Local setting mode”. After confirming the LED lamp of POWER/MODE blinks 9 times, press the ENTER switch but- ton (S132). PUMP POWER LOW NOISE PEAK CUT DOWN...

  • Page 95: Accessories

    14. Accessories 14-1. Models: AOUH18LMAS1 and AOUH24LMAS1 Part name Exterior Q’ty Part name Exterior Q’ty Installation manual Drain cap Drain pipe - 91 - 14-1. Models: AOUH18LMAS1 and AOUH24LMAS1 14. Accessories...

  • Page 96: Optional Parts

    15. Optional parts Exterior Part name Model name Summary Use to operate the external input and External UTY-XWZXZ3 output functions of outdoor unit. connect kit - 92 - 15. Optional parts...

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