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Indirect-Fired Indoor, Separated Combustion Make-Up Air (DBSDCS) 1000x1000 (1)
Indirect-Fired Indoor, Separated Combustion Make-Up Air (DBSDCS) 1000x1000 (1) thumbnail

DBS/DCS Series

Indoor Separated Combustion Indirect-Fired Make-Up Air System

Modine’s DBS/DCS Make-Up Air Systems provide reliable, high-efficiency heating for commercial and industrial settings. Designed for challenging environments, these Separated Combustion systems draw 100% fresh outside air and feature fully gasketed doors to protect internal components and reduce off-cycle heat loss.

With 80% thermal efficiency and model sizes ranging from 100 MBH to 400 MBH, these customizable systems are built to meet a variety of heating and make-up air needs while ensuring the durability and quality expected from Modine.

Models

  • System Unit with Furnace & Blower (DBS)
  • System Unit with Furnace, Blower, & Cooling Cabinet (DCS)
Where To Buy

Highlighted Features

Superior Air Quality

These systems draw 100% of combustion air from outdoors, keeping contaminants, dust, and chemicals away from the burner—perfect for manufacturing spaces, auto shops, and industrial environments with airborne particulates.

Safe, Indirect-Fired Performance

By fully separating the combustion process, the system ensures no combustion byproducts ever mix with the supply air—maintaining exceptional ventilation quality and ensuring code compliance in sensitive facilities.

Reliable Installation & Serviceability

Indoor installation shields the system from environmental wear, while the separated combustion design enhances reliability in harsh indoor air conditions. Accessible components simplify routine service and operation.

Product Details & Specifications

Key Features
  • Model Configurations: System Unit with Furnace & Blower (DBS) or System Unit with Furnace, Blower, & Cooling Cabinet (DCS)
  • Wide Capacity Range: Available in 10 model sizes from 100 MBH to 400 MBH, ensuring efficient heating for a wide range of applications.
  • Enhanced Blower Performance: Five blower sizes and various drive and motor combinations provide robust performance from 750 to 14,500 CFM, achieving total static pressure of up to 3.0″ W.C.
  • Optimized Combustion: Combustion air is sourced entirely from outside, ensuring a consistent supply of fresh, clean air while minimizing off-cycle vent losses for improved building efficiency.
  • Variable Frequency Drives: Ideal for multi-speed or variable air volume applications, enhancing operational flexibility.
  • Advanced Control Options: Equipped with two-position, modulating, or 0-10 Vdc signal-controlled damper actuators for precise airflow management.
  • Modine Controls System: Features a Carel microprocessor controller suitable for complex HVAC/R applications.
  • Energy Efficiency: Achieves 80% thermal efficiency, promoting fuel savings and sustainability.
  • Fuel Options: Compatible with natural or propane gas, with field convertibility from natural to propane.
  • Customizable Configuration: Specify right or left-hand control access when ordering, and choose between a factory-installed DX cooling coil or options provided by others.
  • Extensive Customization: Wide range of controls, options, and accessories to meet demanding specifications.
  • Environmental Protection: Features separate electrical, venting, and gas control access with fully gasketed doors, keeping components sealed from the environment.
  • Flexible Venting Options: Choose from horizontal or vertical two-pipe or concentric venting systems to fit various installation needs.
  • Proudly Designed, Engineered, and Assembled in the USA: Commitment to quality and craftsmanship in every unit.
Options

Factory-Configured Options

  • Model Configurations:
    • System Unit with Furnace & Blower (DBS)
    • System Unit with Furnace, Blower, & Cooling Cabinet (DCS)
  • Input Capacities: 100, 125, 150, 175, 200, 225, 250, 300, 350, or 400 MBH
  • Heat Exchanger, Burner, & Drip Pan Material: All 409 Stainless Steel (Standard)
  • Development Sequence: Single Stage or Modulating
  • Access Side: Left-Hand or Right-Hand
  • Air Temperature Rise (ATR): High (60°–100°F) or Low (20°–60°F)
  • Gas Type: Natural Gas or Propane Gas with IPI (Intermittent Pilot Ignition) Control
  • Gas Control Valves:
    • Single Stage
    • Two Stage
    • Electronic Modulation
    • Primary/Secondary Modulation
    • Modulation with 0-10 VDC control signals
  • Safety Switches: Standard Control Box (no gas pressure switches or high/low gas pressure switch options)
  • Supply Voltage & Control Transformer: Voltages from 115V to 575V (1ph or 3ph) paired with 75VA, 150VA, or 250VA control transformers
  • Blower size & Bearings: Spider bearing or pillow block bearing configurations
  • Motor Horsepower & Type: 1/3 HP to 20 HP (ODP or TE motors; standard or high efficiency; with or without motor starters)
  • Sheave Arrangement: V-Belt adjustable speed sheaves
  • Air Control Options: Openings, dampers, and modulating motors for Return Air (RA) and Fresh Air (FA)
  • Cooling Section Coils (DCS Only): Factory-installed DX Cooling Coils (Single or Dual Circuit; R32 or R454B) or Chilled Water Coils
  • Air Filtration: 2″ Permanent, 2″ MERV 8, or 2″ MERV 13 Filters
  • Cabinet Insulation: Double Wall Construction with 1″ Insulation in blower, cooling, and/or downturn sections
  • Factory Control Safety Devices:
    • Airflow Proving Switch
    • Timed Freeze Protection
    • Fire Stats
    • Control Relays
    • Blower Door Safety Switch
    • GFCI Outlet
    • Dirty Filter Pressure Switch

See catalog 5-173 GAS-FIRED INDOOR AND OUTDOOR MAKE-UP AIR SYSTEMS & DUCT FURNACES for complete details.

Accessories

Field-Installed Accessories

  • Separated-Combustion Vent Termination Kits (Required):
    • Separate Vent Caps (Two-pipe venting)
    • Concentric Vent Kit (Horizontal or Vertical Vent Terminals)
  • Thermostats, Sensors, & Adjusters:
    • Single/Two-Stage room stats
    • Duct Stats
    • Maxitrol Modulating Sensors
    • Setpoint Adjusters
    • Room Overrides
  • Variable Speed Controls: Variable Frequency Drives (VFDs) and UL Type 1 kits
  • System Accessories:
    • 7-Day Programmable Timeclock
    • Mild Temp Stat
    • Duct Smoke Detectors
    • Natural Gas Pressure Regulator
    • Summer/Winter Switch
    • Drain Connector Kit
    • Pipe Hanger Kit
  • Remote Panels: Standard and Custom Remote Monitoring Panels
Warranty
Applications

The DBS/DCS Series is specifically designed for buildings with hostile environments, such as dusty, dirty, or humid applications. Common applications include:

  • Metal fabrication facilities
  • Paint, coating, or chemical processing facilities
  • Agricultural processing facilities
  • High-dust industrial zones
  • Industrial production plants
  • Commercial warehouses

Tech Documents

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