Products Condensers MASA


MASA Installation
MASA Preeva Installation


Reznor's MASA is a condensing unit for outdoor installations, often combined with the PreevA air handling unit. Reznor M series utilizes non-ozone depleting R-410A refrigerant. The system is designed to achieve three stages of cooling. The cooling capacities range from 5 to 20 tons at full load. To further enhance performance and corrosion resistance the M series uses the latest aluminum micro-channel heat transfer technology. This rugged and proven technology is used in automotive AC condensing coils and provides superior performance with lower weight.


Connect To Any:

  • PREEVA:  The combination creates an optimum climatization system capable of cooling large spaces
    • Three-stage (1/2, 2/3, 3/3) design makes the M Series/PreevA combination very effficent in overal seasonal energy use because applications are generally sized to design conditions, a major portion of the total operation time is at conditions less than design. In addition, other advantages include smoother load responses, fewer on/off cycles (compared to conventional single or two stage systems), resulting in reduced cycling and improved reliability.

Exterior Details:

  • Pre-coat off-white gloss finish exterior
  • Cabinet constructed of G-90, intersior surfaces primed
  •  Complete access to all electric and compressor parts to enhance installation and service ease

Cooling Range ( MBH )

Cooling Efficiency ( EER )


  •  Non-ozone depleting, R-410A refrigerant
  •  Normal operating range 55° to 115°F ambient
  •  Dual compressor system to provide 3 stage capacity control - 1/3, 2/3 or full
  •  Pre-coat off-white gloss cabinet finish, G-90 coated material on exterior surface and primer on interior surface,
  • 60 gloss, meets ASTM B117 specification for salt spray to 1,000 hours
  •  Service access door
  •  Corrosion resistant, easily cleanable, aluminum micro-channel condenser coil
  •  Liquid line filter driers - shipped loose with unit for field installation
  •  Refrigerant receiver for each circuit
  •  Fork lift openings built into the heavy gauge base
  •  208-230/3/60 unit supply voltage (20 ton unit available in 460/3/60 only)
  •  24 Volt Controls
  •  75VA transformer with manual reset circuit breaker
  •  Isolation relay on control circuit
  •  High and low pressure switches
  •  Service valves on liquid and suction lines
  •  Angled condenser coil to prevent damage
  •  UL Listed for use in U.S. and Canada (UL 1995 Heating and Cooling Equipment)
  • CE Approved to ENV 327 and EuroVent 7.1 and 8.1y 


Optional Features- Factory Installed

  • 5 minute anti-short cycle timer
  • Optional five (5) year limited warranty on compressors available
  • ElectroFin™ condenser coil corrosion protection coating
  • Condenser coil guard
  • 460/3/60, 575/3/60, 220/3/50, 400/3/50 unit supply voltage
  • Internal capacity control for circuit A only or circuits A and B
  • Interfaces for 3 stages of cooling to modulating signal from room thermostat (Option CL36)

Optional Features- Field Installed 

  • Fusible and non-fusible disconnect switches


3 Files


Split System Marketing Catalog
Split Systems Marketing Catalog
Download File
886.0 kB
Comp Edge: The wide range of options and features of PreevA and the M-Series Condensing unit
Competitive Edge: The wide range of options and features of PreevA and the M-Series Condensing unit
Download File
599.9 kB
Heating, Cooling, Ventilation & VRF Product Line
Heating, Cooling, Ventilation & VRF Product Line Sheet
Download File
630.7 kB

Technical Data
1 File

Technical Data

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

2 Files


Parts Manuals - MASA - Parts
Parts manual for Model MASA
Download File
4.5 MB
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.
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340.4 kB

Other Files
1 File

Other Files

Warranty Statement
Reznor equipment limited warranty statement
Download File
183.4 kB