Slide Out Fan
Fresh Air Hood

Model YDMA makeup air unit provides superior control of high volumes of outside air in a package DX system design. The model’s feature set allows it to properly condition 100% outside air. The unit’s blower system incorporates a superior energy efficient blower design with variable speed control to balance and control the airflow as needed. The DX system maximizes efficiency with the use of modulating digital scroll technology, ECM condenser fans and optimized coil designs. The DX system exceeds ASHRAE standard 90.1 requirements. Model YDMA can utilizes the Tcore3 condensing heat technology. Tcore3 condensing gas heating system maintains greater than 90% efficiency throughout the modulated control range. The system features state of the art stand alone control system that further maximizes energy use.

Heating Range ( MBH )

Cooling Range ( MBH )

Airflow Range ( CFM )

Heating Efficiency ( Gross )

Supply & Exhaust Fan

  • 650 – 7,000 SCFM Direct drive backward incline plenum fan
  • High external static pressure capability
  • Easy CFM verification for all fans Factory installed ABB variable frequency drive
    • Duct static pressure control
    • Summer/winter constant volume
    • External 0-10V signal
    • Automatic low and high speed control

Mechanical Cooling

  • R410A refrigerant (environmentally friendly)
  • High efficiency digital scroll technology 10-100% capacity control
  • Fully interlaced coils
  • Compressor anti-cycle programming
  • Mechanical gauge connections High & low pressure switches
  • Crankcase heaters
  • Anti-rust, dual sloped condensate drain pan
  • Froststat, all circuits

Gas Heating

  • Natural gas or propane furnace
  • Patented Tcore3 combustion control (patent #8,113,269)
  • High capacity heat for colder climates
  • 92% or 80% thermal efficiency 2-4 stage control
  • 5:1 or 10:1 gas modulation
  • 409 stainless steel heat exchanger
  • Failure/alarm diagnostics

Electric Heat

  • High capacity heat for colder climates
  • 3-4 stage control
  • Failure/alarm diagnostics


  • Double wall foam panel construction – R12
  • Hinged access doors with slam latches
  • G90 galvanized steel substrate, 60 gloss finish
  • Convenient single door access panel for all controls, heating, and cooling section
  • 4 point bottom lifting
  • 4” pleated MERV 8 filters
  • Vertical discharge, roof or pad mounting
  • Full perimeter curbs


  • Single point power connections
  • Isolated high voltage compartment
  • ABB patented high voltage management system
  • DDC unit controller output LED status
  • Unit mounted display
  • Unit alarm logging and retrieval
  • Unit sensor and command values trending for retrieval
  • Easy unit functional test mode

8 Files


Patented Hot Gas Reheat Circuit – R7DA, YDMA & YDHA Models
Patented Hot Gas Reheat Circuit – R7DA, YDMA & YDHA Models
Download File
455.9 kB
YDMA Marketing Catalog
Model YDMA Marketing Catalog
Download File
752.2 kB
Comp Edge: P125 Rooftop Unit
The "Reznor Edge" or advantages in using one of the packaged HVAC units in the Platform 125 series. Each offers different benefits to meet a wide variety of application needs.
Download File
584.2 kB
Comp Edge: Superior Dehumidification with ReHeat Pump™
Advantages of using a ReHeat Pump vs. a hot gas reheat (HGRH) system
Download File
404.7 kB
Comp Edge: Model YDMA
Features, benefits and advantages of using Model YDMA for makeup air and ventilation applications
Download File
406.5 kB
Comp Edge: P125 Series Built-to-Last Solid Construction
The P125 Series is design engineered for long-lasting operation.
Download File
245.1 kB
Energy Edge: Condensing Gas Heating (90%+ Efficient)
No matter what region you are in North America, Heating makes up the majority of the average building energy usage. By using Reznor condensing gas heating equipment (over 90% fuel efficient), you can make a big impact on the overall utility bills.
Download File
404.4 kB
Heating, Cooling, Ventilation & VRF Product Line
Heating, Cooling, Ventilation & VRF Product Line Sheet
Download File
630.7 kB

Technical Data
2 Files

Technical Data

Catalog - Rooftop Units
Rooftop unit catalog for Models YDHA & YDMA
Download File
3.8 MB
Sample Specs - YDMA
Sample specifications for Model YDMA (Word document)
Download File
51.3 kB

10 Files


Unit Installation Manual - YDHA, YDMA, & YDSA
Installation manual for Platform 125 Models YDHA, YDMA, and YDSA
Download File
8.0 MB
Operation Manual for YDMA, YDHA, YDSA
Operation, maintenance and service manual for Models YDMA, YDHA, & YDSA in Platform 125
Download File
5.2 MB
Parts Manual - Models YDHA, YDMA, & YDSA
Parts manual for P125 series - Models YDHA, YDMA, & YDSA
Download File
9.6 MB
Option - Installation - Weather Hood Assembly
Instructions for installing a weather hood for Models ADF, ADFH, RCB, RDB, RDCB, RDDB, RECB, REDB, RCC, RDC, RDCC, RDDC, RECC, REDC, RPB, RPBL, RBL, YDHA, YDMA, and YDSA
Download File
814.5 kB
Option - Installation - Roof Curbs Assembly
Instructions for installing roof curb for various models
Download File
1.6 MB
Option - Installation - Power Exhaust Kit - YDMA, YDHA
Power exhaust kit installation instructions for models YDMA and YDHA
Download File
442.4 kB
Controls - R7DA, YDHA, YDMA, and YDSA models
Controls manual for P125 (YDHA, YDMA, and YDSA) and R7DA models
Download File
1.1 MB
Option - Installation - High-Wind Kit
High-Wind Kit Installation Instructions for P125 series: Models YDHA, YDMA, and YDSA
Download File
2.5 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.
Download File
340.4 kB
Instructions D'Installation - Modèle YDHA, YDMA, et YDSA
Installation modèles YDHA, YDMA et YDSA
Download File
8.4 MB

Other Files
1 File

Other Files

Warranty Statement
Reznor equipment limited warranty statement
Download File
183.4 kB

Factory Bulletin : R20-108 : Strategic Importance of Dedicated Outdoor Air Systems (DOAS)

Strategic Importance of Dedicated Outdoor Air Systems (DOAS) in Controlling Disease Transmission.