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Reliable, Effi cient System Operation Provided by:
• Double-width, double-inlet, forward-curved Class I,
AMCA rated centrifugal fan.
• System that does not contaminate heated air with
combustion by-products.
• Operation of fan only in warm weather to enjoy free
ventilation cooling.
• Full-fl oating, stainless steel primary heat exchanger.
• Multiple blowers on tubular steel blower shafts (on
most models).
• Mounting and wiring of all necessary operating
starters, relays, switches, safety controls and fuses.
• Variable pitch drive pulley (up through 10 hp).
• ODP motors with adjustable motor mounts.
Long Lasting Construction Provided by:
• Rugged angle steel base frame on every unit section
to withstand the rigors of shipping and handling.
• Fabricated sheet panels that virtually eliminate
rattling or rumbling.
• Extra long life, self-aligning bearings sized for
industrial duty.
• White painted fi nish.
• Double-wall heat exchanger module.
Ease of Maintenance Provided by:
• Modular designed sections.
• Convenient access to heat exchangers and blower
module for fi eld service.
• Optional service platforms on upright units.
Combat
®
Evaporative Cooling
COMBAT® by Roberts-Gordon IDF-Series evaporative cooling system is an economical cooling solution. It requires no air-
cooled condenser, no chiller or cooling tower, no chilled water pumps or distribution piping/insulation, no major motor control
center or electrical gear. Operating costs are a fraction of similar-capacity mechanical refrigeration systems.
Evaporative cooling works when warm air passes over specially treated wetted media. The heat passes from the air to the
wetted media, causing the water to evaporate and inside air to cool.
Mechanical Cooling
For situations requiring temperature and humidity levels lower than the performance parameters available with outdoor air
alone or with evaporative cooling, COMBAT® by Roberts-Gordon IDF-Series off er a broad range of cooling options.
Cooling options can be added by simply installing coil sections equipped with the appropriate cooling coils and a condensing
unit or chiller. The versatility aff orded by the coil section enables you to utilize DX refrigerant, chilled water or other types of
cooling coils in your system.
Combat
®
by Roberts-Gordon IDF-Series Optional Cooling Packages
by Roberts-Gordon IDF-Series Features
Other IDF-Series Options:
• Natural gas, propane gas or oil burners available.
• Roof curbs and vertical stands simplify mounting.
• Fresh air hood with birdscreen helps protect against
water entrainment.
• V-bank fi lter section with disposable or cleanable
fi lters for longer equipment life of internal
components.
• Motorized two-position inlet or discharge damper
for exfi ltration control.
• Gas trains approved to FM, IRI, or other special code
requirements.
• Insulated and/or weatherized sections available for
outdoor units.
IDF-Series Controls' Options:
• Remote Station with room or discharge thermostat
for easy operation and remote temperature
adjustment.
• UL listed.
• Audible alarm for fl ame failure.
• Clogged fi lter indicator.
• Service Receptacle.
• Unit-mounted on/off toggle switch.
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