Products Air Handlers CAUA


CAUA interior
CAUA with mixing box and coil cabinet ACUC


Reznor's CAUA gas-fired, upflow, blower-type, power-vented, separated combustion heaters are available in six sizes ranging from 150,000 to 400,000 BTUH gas input for use with either natural or propane gas.  The model CAUA line of heaters is design-certified by the Canadian Standards Association (CSA) for installation in the U.S. and Canada.


  • Perfect for tight mechanical rooms
  • Replace the practice of "Twinning" two residential furnaces with a single Supply for gas, electric power, supply & return duct plenums and venting
  • Provides more capacity for heat and can introduce outside air for makeup air to the space.



Heating Range ( MBH )

Cooling Range ( MBH )

Airflow Range ( CFM )

Heating Efficiency ( Gross )

Standard Features:

  • Orifices for natural gas
  • Centrifugal blower
  • Burner rack with in shot burners
  • Direct ignition with 100% lockout
  • Single-stage combination gas valve
  • 230/1/60 supply voltage
  • 230 volt, open/dripproof, direct-drive blower motor with internal overload protection
  • Tubular aluminized steel heat exchanger
  • High temperature limit control
  • Pressure switch to verify vent flow
  • Integrated circuit board with LED diagnostic indicator light
  • 24-volt control voltage transformer
  • Insulated indoor cabinet with return airflow from bottom to top
  • Vertical discharge outlet with duct flange
  • Corner indicators to allow the installer to customize location of the return air opening (either rear, right side, leftside, or bottom)
  • Front service access
  • Choice of power-vented, separated-combustion or power vented only installation

Options /Accessories - Factory Installed:

  • Discharge plenum
  • Orifices for propane gas
  • Orifices for high altitude (2001-9000 ft)
  • Tubular stainless steel heat exchanger
  • Two-stage combination gas valve
  • Adjustable belt drives for up to 2.0" ESP with open dripproof, totally enclosed, or premium efficiency motor
  • 208 single phase supply voltage
  • 208/230/460/575 three phase supply voltage

Options /Accessories - Field Installed:

  • Model ACU cased cooling coil
  • Horizontal or vertical concentric adapter combustion air/vent kit
  • Inlet air base
  • Filter cabinet with 2" filters (assembly required)
  • Mixing box with damper(s) with selection of actuators and controls with or without filters (factory assembled)
  • Thermostat
  • Thermostat guard
  • Vibration isolation (Rubber in shear)
  • Vent cap
  • Manual gas valve
  • Gas conversion kits

5 Files


Split System Marketing Catalog
Split Systems Marketing Catalog
Download File
824.4 kB
Comp Edge: The advantages of Model CAUA over twinned residential units for light commercial applications
Competitive Edge: The advantages of Model CAUA over twinned residential units for light commercial applications
Download File
311.0 kB
Cooling & Ventilation Product Line
Cooling & Ventilation Product Line Card
Download File
462.8 kB
VRF Product Line
VRF Product Line Card
Download File
489.1 kB
Heating & Ventilation Product Line
Heating & Ventilation Product Line Card
Download File
736.3 kB

Technical Data
1 File

Technical Data

Catalog - Vertical Split System
Vertical split system catalog for Model CAUA
Download File
1.2 MB

20 Files


Unit Installation Manual - CAUA
Installation manual for Model CAUA
Download File
2.1 MB
Parts Manuals - CAUA - Parts Manual
Parts manual for Models CAUA, ACUA, ACUB, & ACUC
Download File
1.5 MB
Option - Installation - ACU - Cased Cooling Coil Installations
Installation instructions for optional cased cooling coils for Model CAUA - Model ACUA, ACUB, ACUC
Download File
418.8 kB
Option - Installation - Filter Cabinet Instructions - Model CAUA
Installation instructions for optional filter cabinet for Model CAUA
Download File
1,011.6 kB
Option - Installation - Mixing Box Installation - Model CAUA
Instruction manual for installing optional outside air mixing box for Model CAUA
Download File
240.0 kB
Option - Installation - Discharge Plenum Installation - Model CAUA
Installation instructions for optional discharge air plenum for Model CAUA.
Download File
371.1 kB
Option - Installation - Inlet Air Base Installation Manual - Model CAUA
Installation manual for installing optional inlet air mounting base for Model CAUA
Download File
145.3 kB
Option - Installation - Vent/Combustion Air Kits Installation
Instructions for installing vertical or horizontal vent/combustion air kits for separated combustion
Download File
304.5 kB
Parts Manuals - Functional Replacement Fan/Blower Controls and Limit Controls
 Parts manual for functional replacement fan/blower controls and limit controls
Download File
322.8 kB
Option - Installation - Burner Condensate Drain Kit - CAUA
Instructions for installing burner condensate drain for Model CAUA
Download File
250.4 kB
Conversion Info - Gas Conversion Kit - Model CAUA
Convert Model CAUA from natural gas to propane or from propane to natural gas
Download File
241.0 kB
Parts Manuals - Replacement Ignition System and Gas Valves
Replacement ignition system and gas valves by serial number code and Maxitrol system components by serial number suffix
Download File
1.3 MB
Option - Installation - Valve Kit - M8, U8, U9
Replacement kit for propane valve with serial number code M8, U8, or U9
Download File
127.1 kB
Field Service - Damper Motor Replacement Kit
Replacement kit for discontinued damper motors
Download File
440.0 kB
Option - Installation - Valve Kit - M6
Replacement kit for natural gas valve with code M6
Download File
120.5 kB
Operation - Model CAUA
Operation, maintenance and service manual for Model CAUA
Download File
748.8 kB
Field Service - Direct Spark Ignition Controller Replacement Kit
Instructions for DSI controller replacement kit for Model CAUA
Download File
497.9 kB
Field Service - Replacement of Discontinued Relays
Installation for kits designed to replace relays no longer available from suppliers. Applies to all Reznor units using obsolete relays.
Download File
340.4 kB
Unité manuel d'installation - CAUA
Installation: Générateurs d’air chaud intérieurs à gaz ventilé mécaniquement, vertical (flux montant), modèle CAUA
Download File
2.8 MB
Opération - Modèle CAUA
Opération, entretien et réparation - modèle CAUA Générateurs d’air chaud intérieurs à gaz ventilé mécaniquement, vertical (flux montant)
Download File
788.6 kB

Other Files
1 File

Other Files

Warranty Statement
Reznor equipment limited warranty statement
Download File
183.4 kB