AOU18RLXFZH 1.5 Ton Fujitsu Outdoor Unit/Heat Pump 21.5 SEER


Brand: Fujitsu

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Product Details

AOU18RLXFZH Outdoor Heat Pump 1.5 Ton 22,000 BTU 


AOU18RLXFZH Function 

The Fujitsu AOU18RLXFZH outdoor heat pump for a ductless mini split system is a quiet and slim outdoor heat pump that fits perfectly out of the way and is small enough to cause no intrusion. The Aesthetic, minimalist design delivers powerful cooling abilities while at the same time blending in to any outdoor environment. 

AOU18RLXFZH High Performance Low-Ambient Heating 

Thanks to the larger heat exchanger and high capacity compressor, the RLS3 ductless mini split models offer improved low temperature heating capacities. The RLS3 ductless mini split models can operate down to -5F.  The RLXFZH models offer even greater improvement and can heat down to -15F. 

AOU18RLXFZH World Class Performance 

Since ductless mini splits have little to no ducting, they forego those energy losses typically associated central forced-air systems. Duct losses can easily account for more than 30% of energy consumption, especially if the ducts are not sealed tight or in an unconditioned space such as an attic or crawlspace. 

AOU18RLXFZH Inverter Technology 

Through  advanced technology, Inverter air conditioners are more economical to operate and quieter to run than conventional units. They can handle greater extremes in temperature, are smoother and more stable in operation, and reach the desired temperature more quickly than conventional air conditioners.

The Inverter component allows the outdoor unit to vary its speed and output to match the required capacity of the indoor unit. Thus, the Inverter model can achieve 30% more operating efficiency than conventional models and therefore, is much less expensive to run.     



The Extra Low Temperature Heating ductless mini split series features outdoor condensing units engineered to operate down to -15F, lower than any other mini-split available today. 


AOU18RLXFZH Specifications 

  • Outdoor Unit Model: AOU18RLXFZH
  • Indoor *1:(ASU) / (ARU) / (AGU) / (AUU) 7,9,12RLF(1)
  • Connectable indoor units:2
  • SEER Wall Mouted: 21.5
  • SEER Ducted: 19
  • SEER Mix: 20.3
  • EER Wall Mounted: 13.5
  • EER Ducted: 12.4
  • EER Mix: 13
  • HSPF Wall Mounted: 10.3
  • HSPF Ducted: 9
  • HSPF Mix: 9.7 
  • Total capacity range:14,000 – 21,000 Btu/h
  • Electrical: 208/230V AC 1ph-60Hz
  • Available Voltage Range: 208/230 +/- 10%
  • Minimum Circuit Ampacity: 19.7 A
  • Max Fuse Size: 20 A
  • Max Starting Current: 7.9 A

Input Power

  • Cooling: (non-duct) 1.33 kW / (ducted) 1.45 kW / (mix) 1.39 kW
  • Heating: (non-duct) 1.70 kW / (ducted) 1.79 kW / (mix) 1.74 kW


  • Cooling: (non-duct) 5.8 A / (ducted) 6.4 A / (mix) 6.1 A
  • Heating: (non-duct) 7.5 A / (ducted) 7.9 A / (mix) 7.7 A


  • Nominal Cooling: 18,000 Btu/h
  • Min-Max Cooling: 6,100 – 21,000 Btu/h
  • Nominal Heating: 22,000 Btu/h
  • Min-Max Heating: 6,800 – 24,400 Btu/h
  • Compressor: Rotary (inv x1)
  • Motor Output: 1,100 W
  • Refrigerant: R410a
  • Charge: 4 lbs. 3 oz
  • Oil: RB68
  • Fan Motor
  • (Condenser) Type: DC: Propeller x1
  • (Condenser) Motor Output: 100 W
  • (Evaporator) Type: DC: (wall-mount) Cross flow
  • (Evaporator) Motor Output: (wall) 30W-42W (compact cassette) 54W (ducted) 80-81W
  • Heat Exchanger (floor) 16W


(H x W x D) in. (mm): 31-7/16 x35-7/16 x 1-7/16 (798x900x36.38)

  • Fin Pitch: 20 FPI
  • Rows x Stages: 2 x 38
  • Pipe Type (Material): Copper
  • Fin Type (Material): Aluminum
  • Operation Temperature Range Cooling: 14°F (-10°C) - 115°F (-46°C)
  • Heating: -15°F (-15°C) - 75°F (-24°C)
  • Material: Painted galvanized steel
  • Color: Beige (10 YR 7.5/1.0 NN)
  •  Sound Pressure Level Outdoor: 48 dB(A)
  • Dimensions H x W x D Condenser Net in. (mm):  32-11/16 x 35-7/16 x 13
  • Connection Pipe
  • Liquid:1/4” x2
  • Gas: 3/8” x2
  • Method (Liquid/Gas): Brazing
  • Max Length (Pre-charge):  164ft. (50m) / (98 ft. {30m})
  • Max Height Difference: 49 ft. (15m)
  • Weight Outdoor: 134 lbs. (61 kg)


Fujitsu AOU18RLXFZH Ductless Mini Split Residential Applications 


  • Sun rooms
  • Wine cellars
  • Guest quarters
  • Garage workshops
  • Homes without duct work
  • Bedrooms and family rooms
  • Room additions and renovations


Fujitsu AOU18RLXFZH Ductless Mini Split Commercial Applications 


  • Storage facilities
  • Hotels and other lodging
  • Computer rooms/server rooms
  • Offices in warehouse spaces
  • Restaurant kitchen and prep areas
  • Buildings where security concerns prevent the use of window units
  • Internal areas without exterior wall access applications
  • Commercial add on jobs where the existing air conditioning system cannot be stretched.
  • Historical renovations or any application where preserving the look of the original structure is crucial.