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®
Combat
IDF-Series
Equipment Speci cations
1.800.828.7450
Quality in Any Language
™
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INDIRECT-FIRED AIR HANDLER GUIDE SPECIFICATION
PART 1 GENERAL [Gas][Oil][Gas/Oil Combo]-Fired
Provide units with heating and ventilating sections, designed
and manufactured for indoor or outdoor installation. Units
shall be packaged air handlers which include casing, [nonmodulating][modulating] burner, primary and secondary heat
exchangers, and non-overloading fan.
1.1 SECTION INCLUDES
A. Indirect- red air handler
B. Controls
1.2 REFERENCES
A. American Society for Testing Materials (ASTM):
1. Standard A653/653M; Standard Speci cation for Steel
Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated
(Galvannealed) by the Hot Dip Process
B. ETL Testing Laboratories, Inc. (ETL):
(Nationally recognized testing laboratory certi es code
conformance.)
1. Requirements applicable to product labeling and listing in the
Directory of ETL Listed Products.
C. Factory Mutual Insurance (FM):
(Certi es gas manifold to owner's insurance carrier.)
D. Industrial Risk Insurance (IRI):
(Certi es gas manifold to owner's insurance carrier.)
E. National Electrical Manufacturers Association (NEMA):
1. Standard 250; Enclosures for Electrical Equipment
(1000 V Maximum)
F. National Fire Protection Association (NFPA):
(Establishes re prevention standards.)
1. Article 54; National Fuel Gas Code
2. Article 70; National Electric Code
3. Article 31; Standard for Installation of Oil-Burning
Equipment
4. Article 33; Standard for Spray Application Using Flammable
or Combustible Materials
5. Article 86; Standard for Ovens and Furnaces
G. National Roo ng Contractors Association (NRCA):
1. e NRCA Roo ng and Waterproo ng Manual, Second
Edition
H. Occupational Safety and Health Administration (OSHA):
(Enforces air quality standards and safety in the workplace.)
I. Underwriters Laboratories, Inc. (UL):
Nationally recognized testing laboratory
(
conformance, product labeling and listing.)
1. Standard UL727 Standard for Oil-Fired Central Furnaces
2. Standard UL731 Standard for Oil-Fired Unit Heaters
3. Standard UL795 Standard for Commercial-Industrial Gas
Heating Equipment
certi es code
1.3 SUBMITTALS FOR REVIEW
A. Product Data: Provide data with dimensions, duct and service
connections, accessories, controls, electrical nameplate data and
wiring diagrams.
B. Submittal Drawings: Indicate dimensions, duct and service
connections, accessories, controls, electrical nameplate data and
wiring diagrams.
1.4 SUBMITTALS FOR INFORMATION
A. Manufacturer’s Instructions: Indicate rigging, assembly and
installation instructions.
1.5 SUBMITTALS AT PROJECT CLOSEOUT
A. Project Record Documents: Record actual locations of remote
sensors, control panels and other components.
B. Operation and Maintenance Data: Include manufacturer’s
Installation, Operation and Service Manual.
C. Warranty: Submit manufacturer’s warranty and ensure forms
have been lled out in owner’s name and registered with the
manufacturer.
1.6 QUALITY ASSURANCE
A. Manufacturer Quali cations: Company specializing
in manufacturing the products speci ed in this section
(proportional, building pressure controlling, modulating
indirect- red air handler) with a minimum of ten years
documented experience. Equipment shall be the standard
product of the manufacturer and shall have complete cataloged
data.
B. Installer Quali cations: All installation and service of indirect-
red air handlers must be performed by a contractor quali ed
in the installation and service of said products with proof of a
minimum of three years documented experience.
C. Factory Testing: Each air handler shall be factory-tested.
Testing shall consist of checking all circuits for continuity,
operability of all valves, control motors, fan speed, linkages,
switches and burner. Each air handler shall be test- red for
minimum and high re conditions. See "Fan and Motor" for
additional fan testing requirements.
1.7 REGULATORY REQUIREMENTS
A. Conform to the National Fuel Gas Code (NFPA 54/ANSI
Z223.1).
B. Conform to required or speci ed insurance speci cations (FM,
IRI, etc.) for the gas manifold construction.
1.8 WARRANTY
A. e product shall have a manufacturer's limited warranty of at
least 24 months, subject to the manufacturer's standard warranty
limitations.
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PART 2: PRODUCTS
2.1 MANUFACTURERS
A. COMBAT® IDF-Series which can incorporate one of the
following air control schemes:
• 100% outdoor air (MUA Style)
• Manual modulation of 0% - 100% outdoor air (FR Style)
• Automatic modulation of 0% - 100% outdoor air (AM Style)
2.2 MANUFACTURED UNITS
A. Unit: Constant volume [outdoor] [indoor] indirect- red air
handler.
2.3 FABRICATION
A. Casing and Components: Units to have a welded steel frame.
e casing shall be constructed of a minimum of 16 gauge, cold
rolled steel and the panels shall be fabricated into self-framing,
standing seam type construction. e panels shall [form a selfframing casing] [be properly supported with welded structural
angle, channel and tubular steel framework]. e exterior
roof panels shall be a minimum of 16 gauge, cold rolled steel.
e top wearing surface of the oor of each section shall be a
minimum of 16 gauge, cold-rolled steel. e cabinetry of the
heat exchanger section shall have internal heat shields to protect
the exterior unit skin and allow air to travel between the exterior
and the shield.
B. Fan Support: Fan housing(s) shall be welded to the casing and
reinforced with structural angle or tubing to reduce vibration
and sound.
C. Access Doors: Doors in the unit housing shall be provided
to permit ready access to all internal components. e access
doors shall be of 16 gauge cold rolled steel. e doors shall be
designed to swing out with a hinge. e door shall be framed by
the wall panels of the unit casing.
D. Outdoor Installation (Optional): A service vestibule shall
encase the unit control panel, power burner and gas train. All
joints and seams are to be caulked and weather proofed. All
access doors to be fully gasketed. Roof panels shall be pitched
(optional on IDF-35 through IDF-125; standard on IDF-150
through IDF-450).
E. Li ing Points: e li ing channels/tubes shall be provided on
the base on the corners of each section of the air unit.
F. Finish: White air dry enamel is standard nish.
G. Observation Port: A permanent observation port shall be
provided in the burner to allow observation of both the pilot
and main ame.
2.4 POWER BURNER AND GAS TRAIN ([Gas][Oil[Gas/Oil
Combination])
A. Burner: Furnish and install one [on/o gas burner] [high/
low/o gas burner] [3:1 turndown gas burner] [8:1 turndown
gas burner] [10:1 turndown gas burner] [on/o oil burner]
[high/low/o oil burner] [fully-modulating oil burner] [on/o
combination burner] [high/low/o combination burner] [fullymodulating combination burner]. e burner shall incorporate
a stainless steel ame retention type combustion head.
Combustion head shall be symmetrically round with internal
gas pilot. Primary-secondary air control shall be a design
function of the combustion head.
B. Burner Assembly/Gas Train: e gas train piping shall include
a 1/4" NPT pressure tapping with 1/4" pipe plug upstream
and downstream of valve and regulator in the gas train, one
manually operated ball valve upstream of all valves, one main
gas pressure regulator with vent, one safety shuto valve which
shall be proven closed during pre-ignition by proof of valve
closure interlock switch on valve on FM gas trains over 5 million
Btu/h input, primary and secondary automatic gas safety shuto
valves to operate simultaneously, manually operated gas valve
which shall be located downstream of both automatic gas valves
to permit leakage testing of the valves and [a normally open,
fully ported, electrically operated valve shall be provided in a
vent line connected between the two safety shut o valves.] e
vent pipe shall be run outside to atmosphere. Electronic safety
combustion controls shall be supplied complete with ultraviolet ame scanner to monitor the pilot and main ame. A
programming relay shall be furnished. It shall be so utilized as to
provide intermittent type gas electric ignition and pre-ignition
purge timer.
C. Pilot: Automatic electronic ignition system.
D. Damper (Optional): Motorized with end switch to prove
position before burner operation.
2.5 INDIRECT-FIRED HEAT EXCHANGER
A. Heat Exchanger: Heat exchanger drum and front header is to
be made entirely from 409 stainless steel. e secondary heat
exchange surfaces shall be made from [carbon steel] [stainless
steel]. Heat exchanger is to incorporate primary surface drum
and secondary surface tubes in a [three][four] pass design.
Ba es are to be utilized to assure proper air distribution on the
heat exchanger at low air volumes. e primary surface is to be
no less than 16 gauge, the secondary tubes are to be no greater
than 3" in diameter and no less than .055" wall thickness. e
front and rear headers, as well as the intermediate headers are
to be a minimum of 16 gauge. e front and rear collector
boxes shall be a minimum of 8" deep. e front and rear
collector boxes shall overhang the drum and include an integral
directional ba e to direct air to cover the entire box as well as
the box to tube joint.
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2.6 FANS AND MOTORS
A. Fan: e fan(s) shall consist of centrifugal, [forward curved]
[backward inclined or air foil] double-width, double-inlet
(DWDI) blower wheels and scrolls. e blower assembly
shall be dynamically balanced. Blower sha s shall be of
tubular design. e sha s shall not pass through their rst
critical speed when the unit comes up to the rated RPM.
Sha shall be coated with a rust inhibitor.
B. Drive: All V-belt drives shall be standard capacity, with
reinforced rubber belts. Drives are mounted outside the
airstream. e sheaves shall be of a cast iron type. Standard
drive sheaves are [adjustable with a plus or minus 7%
adjustability on 10HP motors and smaller] [ xed pitch type
on 15HP motors and larger]. e service factor used for Vbelt drives shall be not less than 1.25. An adjustable motor
base shall provide variation in center distance and shall be
readily adjustable by means of screw adjustments. A locking
nut, or similar device, shall be provided to secure the base in
proper position.
C. Fan Bearings: Blower wheels shall be supported by
[two][three] [four] outboard bearings which shall be of a
self-aligning, ball bearing type and shall have an ABMA L10
rated life of 100,000 hours.
D. Motor: Motor shall be [ODP], [TEFC], [explosion proof],
[high e ciency], 1800 RPM, [1 Ø][3 Ø], 60 Hz, wired for
the selected voltage. Motor horsepower shall be as indicated
on the schedule. All 3 Ø motors shall be controlled and
protected by an automatic starter with thermal overload
protection. Starter shall be interlocked to prevent burner
operation when overload relays are tripped. Motors are
mounted outside the airstream.
2.7 CONTROL SYSTEM
A. Factory Testing: e o /low- re/high- re operation of
the burner shall be controlled by means of a temperature
control.
B. Control Enclosure: A factory pre-wired control cabinet
shall be supplied with the burner. Cabinet is mounted on or
near burner. Cabinet to house the ame safeguard control,
programming purge timer, burner motor starter, fuses,
control switches and relays. e unit shall be provided with
an integral weatherproof control panel with 115 volt control
transformer, fuses, terminal strip, and motor starter with
overload protection. Fan/blower motor(s) will be wired to
the motor starter(s).
C. Disconnect Switch (Optional): A unit disconnect switch
shall be provided [on the exterior of the unit for single point
wiring connection][loose].
D. Flame Relay: A manual restart of the burner shall be
necessary in the event of shutdown due to ame failure.
2. Low Gas Pressure: e low gas pressure switch shall
turn the burner o when the gas pressure is below its
setpoint. e minimum gas pressure shall be set at 7"
w.c..
3. High Temperature Limit Switch: A manual reset high
temperature switch shall turn the burner o when air
is discharged above its setpoint. e high temperature
limit switch shall be factory set at 200° F.
F. Electronic Controls System:
1. Temperature Controller: Provide with either discharge
temperature or room temperature controller.
2. Remote Control Panel (One for Each Unit): Mount
unit operating switch and Remote Panel lights, as
follows:
• Including Summer/O /Winter switch, Blower on/o
light, Burner on/o light, ame failure light
(standard) and room temperature thermostat
(optional).
• Night setback with Occupied/Unoccupied switch,
seven-day mechanical timeclock or seven-day
electronic timeclock (optional).
• Unit mounted on/o toggle switch (optional).
• Clogged Filter light (optional).
• Burner alarm horn (optional).
• Burner on/o outdoor air thermostat (optional).
• Fan on/o low-limit control with bypass timer
(optional).
2.8 AIR HANDLER OPTIONS AVAILABLE
(Select Applicable Options)
A. Roof Curb: [Burner/blower sections only] [full perimeter]
roof curb available in height of [16"] [24"]. Curbs shall be
manufactured of minimum 14 gauge galvanized steel with
all the hardware for bolt-together assembly. Curb is to be a
minimum of 16" high.
B. Inlet Hood: Hood shall be manufactured of a minimum of
16 gauge steel. A galvanized birdscreen is to be supplied.
Air velocities at wind resistant angled intake are not to
exceed velocities which would approach water carry-over.
C. Insulation: (Optional): Insulation shall be 1", 1.5 lb. per sq.
. rigid, rot-proof, non-combustible glass ber insulation.
Mount insulation in roof, sides, oors, interior partitions
and all service doors of [burner/blower section only] [entire
unit]. Insulation shall be matte-faced when in single wall
application.
E. Safety Controls:
1. High Gas Pressure: e high gas pressure switch
shall turn the burner o when the gas pressure is above
its setpoint. e maximum gas pressure shall be set at
1" above the maximum gas pressure at high re.
D. Discharge Head: e manufacturer shall provide an
adjustable, double-de ection discharge head for units with a
horizontal discharge. Units with a bottom discharge shall be
provided with an adjustable, four-way plenum.
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INDIRECT-FIRED AIR HANDLER GUIDE SPECIFICATION
PART 3: EXECUTION
E. Filter Section: Standard lter section constructed shall be
V-bank style, with disposable or cleanable lters. Filter type
options include but are not limited to: permanent aluminum
mesh, berglass throw-away, pleated-panel polyester rated at
30% ltration e ciency or at-panel polyester rated at 30%
ltration e ciency.
F. Service Platform: Each air handler shall be furnished with a
minimum 48" deep service platform running the full width
of the air handler. e platform shall be constructed with a
minimum 1" thick grating, an OSHA-Approved hand rail
on three sides and steel safety chains on the remaining sides.
Ladder access to be provided by others.
G. Smoke Detector: A smoke detector shall be provided to shut
o air handler if smoke is detected.
H. Carbon Dioxide (CO
dioxide sensor shall be provided for initiating additional
outdoor ventilation.
I. Mixing Section (Optional): e mixing box shall be provided
with opposed-blade return air and fresh air dampers with
modulating actuator(s). e mixing box shall be capable of
0-100% fresh air to return air ratio. Standard damper control
shall be controlled by a potentiometer. A photohelic shall
be provided for automatic control of the dampers based on
building pressure (optional).
) Detector: A room-mounted carbon
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3.1 INSTALLATION
A. e unit shall be started per the instructions in the
Installation, Operation, and Service Manual by the installing
contractor. A factory provided eld start up form shall be
lled out by the contractor and mailed to the manufacturer.
e start-up shall include, but not be limited to:
• Veri cation of proper supply power and fuel.
• Veri cation that electrical terminals are secure.
• Proper air ow balance.
• Veri cation of combustion e ciency and proper burner
adjustments
• Testing of all safety and operating controls.
• Setting of [High and Low][Modulation] re.
B. One copy of the Installation, Operation, and Service Manual
shall be enclosed in the unit control panel. e manual
shall consist of recommended installation procedures
and guidelines, inspection, initial start-up, operating,
maintenance and troubleshooting sections.
3.2 SCHEDULES
A. See plans.
2.9 PERFORMANCE
A. See Schedule on plans.
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Thank You for Your Business!
Installation Code and Annual Inspections:
All installations and service of ROBERTS GORDON
service of equipment sold and supplied by Roberts-Gordon and conform to all requirements set forth in the ROBERTS GORDON
manuals and all applicable governmental authorities pertaining to the installation, service and operation of the equipment. To help
facilitate optimum performance and safety, Roberts-Gordon recommends that a qualifi ed contractor annually inspect your ROBERTS
GORDON
Further Information: Applications, engineering and detailed guidance on systems design, installation and equipment performance is
available through ROBERTS GORDON
Installation, Operation and Service Manual.
This product is not for residential use.
This document is intended to assist licensed professionals in the exercise of their professional judgement.
Roberts-Gordon, LLC
1250 William Street
P.O. Box 44
Bu alo, NY 14240-0044 USA
Telephone: 716.852.4400
Fax: 716.852.0854
Toll Free: 800.828.7450
®
equipment and perform service where necessary, using only replacement parts sold and supplied by Roberts-Gordon.
®
representatives. Please contact us for any further information you may require, including the
®
equipment must be performed by a contractor qualifi ed in the installation and
European O ce:
Roberts Gordon Europe Limited
Telephone: +44(0)121 506 7700
Fax: +44(0)121 506 7701
®
www.rg-inc.com
© 2007 Roberts-Gordon, LLC All rights reserved. No part of this work covered by the copyrights herein may be reproduced or copied in any form or
by any means – graphic, electronic, or mechanical, including photocopying, recording, taping, or information storage
and retrieval systems – without written permission of Roberts-Gordon, LLC.
Printed in U.S.A. CIDFESNA 2M 0807 Orig
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