Rheem RIWH18AVFJ Design & Technical Manual
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Rheem RIWH18AVFJ Design & Technical Manual

Wall mounted type
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AIR CONDITIONER
Wall mounted type
DESIGN & TECHNICAL MANUAL
INDOOR
OUTDOOR
RIWH18AVFJ
RIWH24AVFJ
ROSH18AXFWJ
ROSH24AXFWJ
R410A
REFRIGERANT
INVERTER
DR_AS043EM_01
2017.01.27

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Do you have a question about the RIWH18AVFJ and is the answer not in the manual?

Questions and answers

JAMES MILLER
April 14, 2025

Unit does not start, new batteries in remote. Will only start manually holding unit button 10 seconds

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1 comments:
Mr. Anderson
April 15, 2025

The Rheem RIWH18AVFJ unit may not start with the remote after replacing the batteries because, if memory backup is not enabled (SW6 set to OFF), all settings stored in memory are deleted during a power failure or battery replacement. You need to reconfigure the settings or enable memory backup by setting SW6 to ON using the wired remote controller.

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Summary of Contents for Rheem RIWH18AVFJ

  • Page 1 R410A REFRIGERANT INVERTER AIR CONDITIONER Wall mounted type DESIGN & TECHNICAL MANUAL INDOOR RIWH18AVFJ RIWH24AVFJ OUTDOOR ROSH18AXFWJ ROSH24AXFWJ DR_AS043EM_01 2017.01.27...
  • Page 2 Notices: • Product specifications and design are subject to change without notice for future improvement. • For further details, please check with our authorized dealer.

  • Page 3: Table Of Contents

    CONTENTS Part 1. INDOOR UNIT............... 1 1. Specifications.................... 2 2. Dimensions....................3 2-1. Models:RIWH18AVFJ and RIWH24AVFJ..............3 3. Wiring diagrams ..................5 3-1. Models:RIWH18AVFJ and RIWH24AVFJ..............5 4. Capacity table.................... 6 4-1. Cooling capacity......................6 4-2. Heating capacity ......................8 5.
  • Page 4 CONTENTS (continued) Part 2. OUTDOOR UNIT..............31 1. Specifications..................32 2. Dimensions....................33 2-1. Models:ROSH18AXFWJ and ROSH24AXFWJ ............33 3. Installation space ..................34 3-1. Models:ROSH18AXFWJ and ROSH24AXFWJ ............34 4. Refrigerant circuit ................... 37 4-1. Models:ROSH18AXFWJ and ROSH24AXFWJ ............37 5.

  • Page 5: Part 1. Indoor Unit

    Part 1. INDOOR UNIT WALL MOUNTED TYPE: RIWH18AVFJ RIWH24AVFJ...

  • Page 6: Specifications

    1. Specifications Wall mounted Type Inverter heat pump Model name RIWH18AVFJ RIWH24AVFJ Power supply 208/230 V ~ 60 Hz Available voltage range 187—253 V 5.28 6.44 Rated Btu/h 18,000 22,000 Cooling 2.05—6.74 2.90—8.00 Min.—Max. Btu/h 7,000—23,000 9,900—27,300 Capacity 6.30 7.38...

  • Page 7: Dimensions

    2. Dimensions 2-1. Models:RIWH18AVFJ and RIWH24AVFJ Unit: in (mm) 39-5/16 (998) 9 (238) 39-5/16 (998) 18-9/16 (471) 17 (432) 2-5/8 (67) 1-1/8 (28) Outline of unit 2-3/8 (61) 17-1/4 (438) 15-5/8 (397) 4 (102) Ø 3-1/8 (80) hole Ø 3-1/8 (80) hole...
  • Page 8 ¢ Installation space requirement Provide sufficient installation space for product safety. Unit: in (mm) Outline of unit 3 (52) or more 3 (53) or more 4 (80) or more 5 (120) or more 60 (1,500) or more - 4 -...

  • Page 9: Wiring Diagrams

    3. Wiring diagrams 3-1. Models:RIWH18AVFJ and RIWH24AVFJ - 5 -...

  • Page 10: 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:RIWH18AVFJ Indoor temperature °FDB °FWB °FDB...
  • Page 11 ¢ Model:RIWH24AVFJ Indoor temperature °FDB °FWB °FDB kBtu kBtu kBtu kBtu kBtu kBtu 19.12 11.45 0.30 21.30 11.51 0.30 23.48 12.56 0.31 24.19 13.56 0.31 25.64 13.52 0.32 27.11 14.39 0.32 19.10 11.47 0.37 21.28 11.54 0.38 23.46 12.58 0.38 24.17 13.59 0.39...

  • Page 12: Heating Capacity

    4-2. Heating capacity ¢ Model:RIWH18AVFJ Indoor temperature °FDB °FDB °FWB kBtu kBtu kBtu kBtu kBtu 20.67 2.13 20.20 2.18 19.70 2.22 19.19 2.27 18.72 2.31 22.67 2.50 22.13 2.55 21.60 2.60 21.06 2.65 20.53 2.70 23.46 2.67 22.89 2.73 22.37 2.78...

  • Page 13: Fan Performance

    5. Fan performance 5-1. Air velocity distributions ¢ Model:RIWH18AVFJ Fan speed Operation mode Measuring conditions HIGH (ft) Unit: ft/s (m/s) Top view Vertical airflow direction louver: Up 7 (2) 3 (1) 2 (0.5) Horizontal airflow direction louver: Center (ft) (ft)
  • Page 14 (ft) Unit: ft/s (m/s) 7 (2) Side view 3 (1) Vertical airflow direction louver: Down 2 (0.5) Horizontal airflow direction louver: Center (ft) - 10 -...
  • Page 15 ¢ Model:RIWH24AVFJ Fan speed Operation mode Measuring conditions HIGH (ft) Unit: ft/s (m/s) Top view 7 (2) 3 (1) Vertical airflow direction louver: Up Horizontal airflow direction louver: Center 2 (0.5) (ft) (ft) Unit: ft/s (m/s) 3 (1) 2 (0.5) 7 (2) Top view Vertical airflow direction louver: Up...

  • Page 16: Airflow

    5-2. Airflow ¢ Model:RIWH18AVFJ  Cooling Fan speed Airflow HIGH QUIET  Heating Fan speed Airflow HIGH QUIET - 12 -...
  • Page 17 ¢ Model:RIWH24AVFJ  Cooling Fan speed Airflow 1,120 HIGH QUIET  Heating Fan speed Airflow 1,150 HIGH QUIET - 13 -...

  • Page 18: Operation Noise (Sound Pressure)

    6. Operation noise (sound pressure) 6-1. Noise level curve ¢ Model:RIWH18AVFJ  Cooling  Heating NC-65 NC-65 NC-60 NC-60 NC-55 NC-55 NC-50 NC-50 HIGH HIGH NC-45 NC-45 NC-40 NC-40 NC-35 NC-35 NC-30 NC-30 NC-25 NC-25 QUIET QUIET NC-20 NC-20 NC-15...

  • Page 19: Sound Level Check Point

    6-2. Sound level check point Microphone Microphone 3 ft 3 in (1 m) -3/8 NOTE: Detailed shape of the actual indoor unit might be slightly different from the one illustrated above. - 15 -...

  • Page 20: Safety Devices

    7. Safety devices Model Type of protection Protection form RIWH18AVFJ RIWH24AVFJ Circuit protection Current fuse (PCB*) 250 V, 3.15 A Terminal protection Current fuse 250 V, 3 A More than 185°F (85°C) Activate Fan motor speed down Thermistor protection Less than 185°F (85°C)

  • Page 21: External Input And Output

    8. 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 CN14 Control input — See external input/output settings for details. CN16 — Operation status output 8-1.
  • Page 22  Circuit diagram example • Contact capacity: DC 24 V or more, 10 mA or Indoor unit more. Connected unit control PCB • *: Make the distance from the PCB to the con- Connector Example: Switch nected unit within 33 ft (10 m). •...

  • Page 23: External Output

    8-2. External output With using external output function, operating status of this product can be transmitted to the ex- ternal device, and also, this product can be inter-connected with the external device. ¢ Operation status output Air conditioner operation status signal can be output. ...

  • Page 24: Remote Controller

    9. Remote controller 9-1. Wireless remote controller ¢ Overview a FAN button Selects the fan speed (AUTO, HIGH, MED, LOW, and QUIET). b START/STOP button Starts and stops operation. c SET button (vertical) Adjusts the vertical airflow direction. d SET button (horizontal) Adjusts the horizontal airflow direction.
  • Page 25 ¢ Specifications  Controller Unit: in (mm) Top view 3/4 (19) 2-3/16 (56) Front view Side view Rear view Size (H × W × D) in (mm) 6-11/16 × 2-3/16 × 3/4 (170 × 56 × 19) Weight oz (g) 3 (85) (without batteries) NOTE: Actual number of buttons might be different from the figure above.

  • Page 26: Function Settings

    10. 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. 10-1. Function settings by using remote controller Some function settings can be changed on the remote controller. After confirming the setting pro- cedure and the content of each function setting, select appropriate functions for your installation environment.
  • Page 27 STEP 2: Selecting the function number and setting value 1. Press the SET TEMP. ( ) buttons to select the function Function number number. To switch between the left and right digits, press the MODE button. 2. Press the FAN button to proceed the setting value. To return the function number selection, press the FAN button again.
  • Page 28 ¢ 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 29 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 correction values show the difference from the Standard setting "00"...
  • Page 30 5) 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 ♦ 6) External input control "Operation/Stop" mode or "Forced stop" mode can be selected. Function number Setting value Setting description...
  • Page 31 8) 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 room temperature sensor may be re- quired. Select the appropriate control setting according to the installed environment. To change this setting, set Function 42 to "Both"...

  • Page 32: 10-2.Custom Code Setting For Wireless Remote Controller

    10-2. 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 custom code if the air conditioner has not been set for the custom code.

  • Page 33: Accessories

    11. Accessories Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Drain hose insulation Installation manual Cloth tape Tapping screw (large), Wall hook bracket M4 × 25 mm Tapping screw (small), Remote controller M3 × 12 mm Battery Air cleaning filter Remote controller Air cleaning filter frame holder...

  • Page 34: Optional Parts

    12. Optional parts 12-1. Controllers Exterior Part name Model name Summary Monitor Mo 10:00AM Large and full-dot liquid crystal Mode Set temp. Wired remote screen, wide and large keys easy to ° F Cool High RXRVNUM Icon check: Menu controller press, user-intuitive arrow key.

  • Page 35: Part 2. Outdoor Unit

    Part 2. OUTDOOR UNIT SINGLE TYPE: ROSH18AXFWJ ROSH24AXFWJ...

  • Page 36: Specifications

    1. Specifications Type Inverter heat pump Model name ROSH18AXFWJ ROSH24AXFWJ Power supply 208/230 V ~ 60 Hz Available voltage range 187—253 V Starting current 10.5 Cooling 1,489 (2,530) 2,001 (3,400) Airflow rate CFM (m Heating 1,489 (2,530) 2,119 (3,600) Type × Q'ty Propeller fan ×...

  • Page 37: Dimensions

    2. Dimensions 2-1. Models:ROSH18AXFWJ and ROSH24AXFWJ Unit: in (mm) Top view 1-1/4 3(77) 35-3/8 (900) 13 (330) (12) (31) 15-3/4 (400) Front view Side view 25-5/8 (650) Airflow 5-3/4 (147) 6-3/4 (170) Bottom view - 33 -...

  • Page 38: Installation Space

    3. Installation space 3-1. Models:ROSH18AXFWJ and ROSH24AXFWJ ¢ Space requirement Provide sufficient installation space for product safety.  Single outdoor unit installation • When the upper space is open: Unit: in (mm) When there are obstacles at the rear only. When there are obstacles at the rear and sides.
  • Page 39  Multiple outdoor unit installation • When the upper space is open: Unit: in (mm) When there are obstacles at the rear only. When there are obstacles at the front only. 60 (1,500) or more 10 (250) 12 (300) or more or more When there are obstacles at the front and rear.
  • Page 40  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 79 (2,000) or more 119 (3,000) or more 24 (600) or more 24 (600) or more 60 (1,500) or more 40 (1,000) or more 10 (250) or more...

  • Page 41: Refrigerant Circuit

    4. Refrigerant circuit 4-1. Models:ROSH18AXFWJ and ROSH24AXFWJ Heat exchanger 3-way valve 3-way valve (INDOOR) (large) (small) Muffler Pressure switch 4-way valve Strainer Expansion valve Strainer Heat exchanger (OUTDOOR) Cooling Heating - 37 -...

  • Page 42: Wiring Diagrams

    5. Wiring diagrams 5-1. Model:ROSH18AXFWJ - 38 -...

  • Page 43: Model:rosh24Axfwj

    5-2. Model:ROSH24AXFWJ - 39 -...

  • Page 44: 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:ROSH18AXFWJ and ROSH24AXFWJ NOTE: Values mentioned in the table are calculated based on the maximum capacity.

  • Page 45: Additional Charge Calculation

    7. Additional charge calculation 7-1. Models:ROSH18AXFWJ and ROSH24AXFWJ Refrigerant type R410A lb oz 4 lb 10.1 oz Refrigerant amount 2,100 ¢ Refrigerant charge 66 or less 164 (Max.) Total pipe length 0.43 oz/ft 20 or less 50 (Max.) 14.1 28.2 42.3 (40 g/m) Additional charge...

  • Page 46: Airflow

    8. Airflow 8-1. Model:ROSH18AXFWJ  Cooling 2,530 1,489  Heating 2,530 1,489 8-2. Model:ROSH24AXFWJ  Cooling 3,400 2,001  Heating 3,600 1,000 2,119 - 42 -...

  • Page 47: Operation Noise (Sound Pressure)

    9. Operation noise (sound pressure) 9-1. Noise level curve ¢ Model:ROSH18AXFWJ  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 2,000...

  • Page 48: Sound Level Check Point

    9-2. Sound level check point Rear Microphone Microphone Airflow 39-3/8 in (1 m) Side view Rear view NOTE: Detailed shape of the actual outdoor unit might be slightly different from the one illustrat- ed above. - 44 -...

  • Page 49: Electrical Characteristics

    10. Electrical characteristics Model name ROSH18AXFWJ ROSH24AXFWJ Voltage 208/230~ Power supply Frequency MCA *1 17.0 18.0 Starting current MAX. CKT. BKR *3 Power cable Wiring spec. Connection cable *4 Limited wiring length ft (m) 167 (51) *1: Minimum Circuit Ampacity (Calculation based on UL1995) *2: Selected sample based on Japan Electrotechnical Standards and Codes Committee E0005.

  • Page 50: Safety Devices

    11. Safety devices Model Type of Protection form protection ROSH18AXFWJ ROSH24AXFWJ Current fuse (Filter PCB) 250 V, 5 A × 2 Circuit protection Current fuse (Main PCB) 250 V, 3.15 A × 2 °F (150 °C) Activate Fan motor stop Fan motor Thermal protection protection...

  • Page 51: Accessories

    12. Accessories Part name Exterior Q’ty Part name Exterior Q’ty Adapter, 12.7 (1/2)→15.88 (5/8) Installation manual [mm (in)] (Only for 18 model) Adapter, 6.35 (1/4)→9.52 (3/8) Drain pipe [mm (in)] Drain cap - 47 -...

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