Roberts Gorden DF Manual

WARNING
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. DO NOT try to light any appliance.
3. DO NOT use electrical switches.
4. DO NOT use any telephone in
your building.
5. Extinguish any open flame.
6. Leave the building.
7. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
8. If you cannot reach your gas
supplier, call the Fire Department.
Fire Hazard
Keep all flammable objects, liquids and
vapors the minimum required clear-
ances to combustibles away from
heater.
Some objects will catch fire or explode
when placed close to heater.
Failure to follow these instructions can
result in death, injury or property
damage.
WARNING
Installation must be done by a contractor qualified
in the installation and service of gas-fired heating
equipment or your gas supplier.
Improper installation, adjustment, alteration, service
or maintenance can result in death, injury or
property damage. Read the Installation, Operation
and Service Manual thoroughly before installing or
servicing this equipment.
Installer
Please take the time to read and understand
these instructions prior to any installation.
Installer must give a copy of this manual to the owner.
Owner
Keep this manual in a safe place in order to provide
your service technician with necessary information.
Roberts-Gordon LLC
1250 William Street
Buffalo, New York 14240-0044
www.robertsgordon.com
© 2022 Roberts-Gordon LLC P/N 173101NA Rev. P 10/22
Model DF
Gas-Fired, Low Intensity
Two Stage Unitary Heater
Installation, Operation &
Service Manual
DF-80
DF-100
DF-125
DF-150
DF-175
DF-200

© 2022
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 the
written permission of Roberts-Gordon LLC.
TABLE OF CONTENTS
SECTION 1: Heater Safety...................................................... 1
1.1 Manpower Requirements .............................................1
1.2 Safety Labels and Their Placement..............................1
1.3 California Proposition 65 ..............................................1
SECTION 2: Installer Responsibility......................................4
2.1 Wall Tag .......................................................................4
2.2 Corrosive Chemicals.................................................... 4
2.3 National Standards and Applicable Codes...................4
SECTION 3: Clearances to Combustibles............................. 5
3.1 Required Clearances to Combustibles......................... 5
SECTION 4: National Standards and Applicable Codes.... 10
4.1 Gas Codes................................................................. 10
4.2 Aircraft Hangars ......................................................... 10
4.3 Public Garages .......................................................... 10
4.4 Electrical .................................................................... 10
4.5 Venting ....................................................................... 10
4.6 High Altitude .............................................................. 10
SECTION 5: Major Components .......................................... 11
5.1 Standard Parts List .................................................... 13
SECTION 6: Heater Installation............................................ 15
SECTION 7: Optional Heater Accessories .......................... 30
7.1 U-Tube Configuration..................................................30
7.2 Elbow Package Configuration.....................................33
7.3 Reflector Side Extension ............................................36
7.4 Lower Clearance Shield Installation ........................... 37
7.5 Two-Foot Decorative Grille Installation ....................... 37
7.6 Protective Grille Installation ........................................ 39
SECTION 8: Venting .............................................................. 40
8.1 Venting ....................................................................... 40
8.2 Unvented Operation................................................... 41
8.3 Horizontal Venting (Category III)................................ 41
8.4 Vertical Venting (Category III) .................................... 41
8.5 Unvented Operation Tube Termination.......................42
8.6 Length Requirements ................................................ 42
8.7 Vent Material Recommendations ............................... 42
8.8 Horizontal Venting (Category III) 4" (10 cm) Pipe ...... 43
8.9 Vertical Venting (Category III) 4'' (10 cm) Pipe........... 43
8.10 Common Side Wall Horizontal Venting (Category III)44
8.11 Common Vertical Venting (Category III) ................... 45
8.12 Outside Combustion Air Supply ............................... 46
SECTION 9: Gas Piping ........................................................ 49
SECTION 10: Wiring .............................................................. 51
10.1 Dual Stage Low Voltage Thermostat Wiring.............51
10.2 Multiple Burners For Connection To One Thermostat52
10.3 Internal Wiring..........................................................53
10.4 Ladder Diagram....................................................... 54
10.5 Electrical Connection to the Burner ......................... 54
SECTION 11: Operation and Maintenance.......................... 55
11.1 Sequence of Operation ............................................ 55
11.2 High/Low Firing Operation........................................ 55
11.3 Sequence of Operation ............................................ 55
11.4 To Shut Off Heater .................................................... 56
11.5 To Start Heater ......................................................... 56
11.6 Pre-Season Maintenance and Annual Inspection..... 56
11.7 Maintenance Checklist ............................................. 56
SECTION 12: Troubleshooting ............................................. 58
12.1 Troubleshooting Flow Chart ..................................... 59
12.2 Manifold Gas Pressure Setting ................................ 61
SECTION 13: Replacement Parts ........................................ 62
SECTION 14: General Specifications .................................. 65
14.1 Material Specifications............................................. 65
14.2 Heater Specifications............................................... 65
14.3 Suspension Specifications....................................... 65
14.4 Controls Specifications ............................................ 65
SECTION 15: The ROBERTS GORDON® GORDONRAY® DF
Warranty ................................................................................ 68
Printed in U.S.A.

SECTION 1: HEATER SAFETY
1
SECTION 1: HEATER SAFETY
Your Safety is Important to Us!
This symbol is used throughout
the manual to notify you of
possible fire, electrical or burn
hazards. Please pay special
attention when reading and
following the warnings in these
sections.
Installation, service and annual inspection of heater
must be done by a contractor qualified in the
installation and service of gas-fired heating
equipment.
Read this manual carefully before installation,
operation or service of this equipment.
This heater is designed for heating nonresidential
indoor spaces. Do not install in residential spaces.
This heater is not certified to meet the requirements
of NFPA30A-2012 Section 7.6.6. (maximum tube
temperature of 750 °F (399 °C)). Do not install this
heater in facilities where compressed natural gas
(CNG) or liquid natural gas (LNG) are present. These
instructions, the layout drawing, local codes and
ordinances, and applicable standards that apply to
gas piping, electrical wiring, venting, etc. must be
thoroughly understood before proceeding with the
installation.
Protective gear is to be worn during installation,
operation and service in accordance to the
Occupational Safety and Hazard Administration
(OSHA). Gear must be in accordance to NFPA 70E,
latest revision when working with electrical
components. Thin sheet metal parts have sharp
edges. To prevent injury, the use of work gloves is
recommended. The use of gloves will also prevent
the transfer of body oils from the hands to the surface
of the reflector.
Before installation, check that local distribution
conditions, nature of gas and pressure, and
adjustment of the appliance are compatible.
This heater must be applied and operated under the
general concepts of reasonable use and installed
using best building practices.
This appliance is not intended for use by persons
(including children) with reduced physical, sensory or
mental capabilities, or lack of experience and
knowledge, unless they have been given supervision
or instruction concerning use of the appliance by a
person responsible for their safety. Children should
be supervised to ensure that they do no play with the
appliance.
For additional copies of the Installation, Operation
and Service Manual, please contact Roberts-Gordon
LLC.
1.1 Manpower Requirements
To prevent personal injury and damage to the heater,
two persons will be required for installation.
1.2 Safety Labels and Their Placement
Product safety signs or labels should be replaced by
the product user when they are no longer legible.
Please contact Roberts-Gordon LLC or your
ROBERTS GORDON® independent distributor to
obtain replacement signs or labels. See Page 2,
Figure 1 through Page 3, Figure 2.
1.3 California Proposition 65
In accordance with California Proposition 65
requirements, a warning label must be placed in a
highly visible location on the outside of the
equipment (i.e., near equipment’s serial plate). See
label placement drawing on Page 3, Figure 2 for label
location. Avoid placing label on areas with extreme
heat, cold, corrosive chemicals or other elements. To
order additional labels, please contact Roberts-
Gordon LLC or your ROBERTS GORDON®
independent distributor.

DF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
2
FIGURE 1: Top and Bottom Panel Label Placement
Description Part Number
Logo Label 91032500
Vent Length Label 91039500
Gas Connection Label 91018123
Burner Status Light Label 91032900

SECTION 1: HEATER SAFETY
3
FIGURE 2: Side and Back Panel Label Placement
96244
1231 10 26 85 216 79201
1846 102259
102259
102259
Level
droit
Level
droit
E
Description Part Number
Rating Plate Label 91010401
Lighting Instruction Plate Label 91029602
Wiring Label 91032801
Clearances to Combustibles Label 91010461
Proposition 65 Label 91070016
Thermostat Connection Label 91033000

DF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
4
SECTION 2: INSTALLER RESPONSIBILITY
The installer is responsible for the following:
• To install the heater, as well as the gas and
electrical supplies, in accordance with applicable
specifications and codes. Roberts-Gordon LLC
recommends the installer contact a local Building
Inspector or Fire Marshal for guidance.
• To use the information given in a layout drawing
and in the manual together with the cited codes
and regulations to perform the installation.
• To install the heater in accordance with the
clearances to combustibles.
• To furnish all needed materials not furnished as
standard equipment.
• To plan location of supports.
• To provide access on all sides for burner servicing
and removal.
• To provide the owner with a copy of this
Installation, Operation and Service Manual.
• To never use heater as a support for a ladder or
other access equipment and never hang or
suspend anything from heater.
• To ensure there is adequate air circulation around
the heater and to supply air for combustion,
ventilation and distribution in accordance with
local codes.
• To safely and adequately install heater using
materials with a minimal working load of 75 lbs
(33 kg).
• To ensure the heater is placed in an approved
application.
2.1 Wall Tag
A laminated wall tag is available for the heater as
a permanent reminder of the safety instructions and
the importance of the required clearances to
combustibles. Please contact Roberts-Gordon LLC
or your ROBERTS GORDON® independent
distributor to obtain the wall tag. Affix the tag by
peeling off the backing of the adhesive strips on the
rear surface and position the tag on a wall near the
heater (e.g. thermostat or ROBERTS GORDON®
Controller).
A copy of the wall tag (P/N 91037912) is illustrated on
the back cover. For an immediate solution, you may
affix this copy on the wall near the heater.
Know your model number and installed configuration.
Model number and installed configuration are found on
the burner and in the Installation, Operation and
Service Manual. and Page 6, Figure 3 through Page
8, Figure 11. Write the proper clearance dimensions in
permanent ink according to your model number and
configuration in the open spaces on the tag.
2.2 Corrosive Chemicals
Roberts-Gordon LLC cannot be responsible for
ensuring that all appropriate safety measures are
undertaken prior to installation; this is entirely the
responsibility of the installer. It is essential that the
contractor, the sub-contractor, or the owner identifies
the presence of combustible materials, corrosive
chemicals or halogenated hydrocarbons* anywhere
in the premises.
* Halogenated Hydrocarbons are a family of
chemical compounds characterized by the
presence of halogen elements (fluorine, chlorine,
bromine, etc.). These compounds are frequently
used in refrigerants, cleaning agents, solvents, etc.
If these compounds enter the air supply of the
burner, the life span of the heater components will
be greatly reduced. An outside air supply must be
provided to the burners whenever the presence of
these compounds is suspected. Warranty will be
invalid if the heater is exposed to halogenated
hydrocarbons.
2.3 National Standards and Applicable Codes
All appliances must be installed in accordance with
the latest revision of the applicable standards and
national codes. This refers also to the electric, gas
and venting installation. Note: Additional standards
for installations in public garages, aircraft hangars,
etc. may be applicable.
CAUTION
Product Damage Hazard
Do not use heater in area containing
corrosive chemicals.
Refer to appropriate Material Safety Data
Sheets (MSDS).
Failure to follow these instructions can result
in product damage.

SECTION 3: CLEARANCES TO COMBUSTIBLES
5
SECTION 3: CLEARANCES TO COMBUSTIBLES
3.1 Required Clearances to Combustibles
Clearances are the required distances that
combustible objects must be away from the heater to
prevent serious fire hazards. Combustibles are
materials that may catch on fire and include common
items such as wood, paper, rubber, fabric, etc.
Maintain clearances to combustibles at all times
for safety.
Clearances for all heater models are located on the
burner of the heater and on Page 6, Figure 3 through
Page 8, Figure 11 in this manual. Check the
clearances on each burner for the model heater
being installed to make sure the product is suitable
for your application and the clearances are
maintained. Read and follow the safety guidelines
below:
• Keep gasoline or other combustible materials
including flammable objects, liquids, dust or
vapors away from this heater or any other
appliance.
• The stated clearances to combustibles represents
a surface temperature of 90 °F (32 °C) above
room temperature. Building materials with a low
heat tolerance (such as plastics, vinyl siding,
canvas, tri-ply, etc) may be subject to degradation
at lower temperatures. It is the installer’s
responsibility to assure that adjacent materials
are protected from degradation.
• Maintain clearances from heat sensitive
equipment and workstations.
• Maintain clearances from vehicles parked below
the heater.
• Maintain clearances from swinging and overhead
doors, overhead cranes, vehicle lifts, partitions,
storage racks, hoists, building construction, etc.
• In locations used for the storage of combustible
materials, signs must be posted to specify the
maximum permissible stacking height to maintain
required clearances from the heater to the
combustibles. Signs must be posted adjacent to
the heater thermostat. In the absence of a
thermostat, signs must be posted in a
conspicuous location.
• Consult local Fire Marshal, Fire Insurance Carrier
or other authorities for approval of proposed
installation when there is a possibility of exposure
to combustible airborne materials or vapors.
• Hang heater in accordance to the minimum
suspension requirements on Page 16, Figure 15.
• If the radiant tubes must pass through the building
structure, be sure that adequate sleeving and fire
stop is installed to prevent scorching and/or fire
hazard.
WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapors the minimum required clearances to
combustibles away from heater.
Some objects will catch fire or explode when
placed close to heater.
Failure to follow these instructions can result
in death, injury or property damage.

DF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
6
NOTE: 1. All dimensions are from the surfaces of all tubes, couplings and elbows.
2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream
from where the burner and burner tube connect.
FIGURE 3: Level Reflector
Model (inches) (centimeters)
ABCDABCD
DF-80 6 38 65 38 16 97 166 97
DF-100 6 40 70 40 16 102 178 102
DF-125 6 46 76 46 16 117 194 117
DF-150 6 50 79 50 16 127 201 127
DF-175 8 52 82 52 21 133 209 133
DF-200 8 52 96 52 21 133 244 133
FIGURE 4: One Side Reflector
(inches) (centimeters)
Model A B C D A B C D
DF-80 6 9 69 54 16 23 176 138
DF-100 6 9 76 59 16 23 194 150
DF-125 6 9 82 65 16 23 209 166
DF-150 6 9 85 69 16 23 216 176
DF-175 8 9 88 73 21 23 224 186
DF-200 8 18 102 73 21 46 260 186
C
BD
A
FIGURE 5: Two Side Reflectors
(inches) (centimeters)
Model A B C D A B C D
DF-80 6 25 71 25 16 64 181 64
DF-100 6 27 77 27 16 69 196 69
DF-125 6 32 83 32 16 82 211 82
DF-150 6 35 87 35 16 89 221 89
DF-175 8 40 91 40 21 102 232 102
DF-200 8 40 102 40 21 102 260 102
C
BD
A

SECTION 3: CLEARANCES TO COMBUSTIBLES
7
NOTE: 1. All dimensions are from the surfaces of all tubes, couplings and elbows.
2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream
from where the burner and burner tube connect.
FIGURE 6: 45° Tilt Reflector
(inches) (centimeters)
Model A B C D A B C D
DF-80 8 8 65 60 21 21 166 153
DF-100 10 8 73 64 26 21 186 163
DF-125 10 8 77 69 26 21 196 176
DF-150 12 8 83 74 31 21 211 188
DF-175 12 8 85 79 31 21 216 201
DF-200 12 10 85 79 31 26 216 201
FIGURE 7: U-Tube, Standard Reflector
(inches) (centimeters)
Model A B C D A B C D
DF-80 6 38 68 37 16 97 173 94
DF-100 6 40 75 39 16 102 191 100
DF-125 6 46 78 43 16 117 199 110
DF-150 6 50 83 47 16 127 211 120
DF-175 8 54 87 51 21 138 221 130
DF-200 8 54 102 51 21 138 260 130
BD
C
A
FIGURE 8: U-Tube, 45°
(inches) (centimeters)
Model A B C D A B C D
DF-80 8 8 65 46 21 21 166 117
DF-100 8 8 73 52 21 21 186 133
DF-125 8 8 77 61 21 21 196 155
DF-150 8 8 83 66 21 21 211 168
DF-175 8 8 85 70 21 21 216 178
DF-200 8 8 85 70 21 21 216 178
C
D
B
A

DF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
8
NOTE: 1. All dimensions are from the surfaces of all tubes, couplings and elbows.
2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream
from where the burner and burner tube connect.
*When installed in the first 10' (3 m).
FIGURE 9: U-Tube, Opposite 45° Reflector
(inches) (centimeters)
Model A B C D A B C D
DF-80 8 60 65 22 21 153 166 56
DF-100 10 64 73 22 26 163 186 56
DF-115/125 10 70 77 22 26 178 196 56
DF-140/150 12 74 83 22 31 188 211 56
DF-175 12 76 85 22 31 194 216 56
DF-200 12 76 85 22 31 194 216 56
B
A
CD
FIGURE 10: 2-Foot Deco Grille and Protective Grille
(inches) (centimeters)
Model A B C D A B C D
DF-80 6 38 65 38 16 97 166 97
DF-100 6 40 70 40 16 102 178 102
DF-125 6 46 76 46 16 117 194 117
DF-150 6 50 79 50 16 127 201 127
DF-175 8 52 82 52 21 133 209 133
DF-200 8 52 96 52 21 133 244 133
C
BD
A
FIGURE 11: Lower Clearance Shield*
(inches) (centimeters)
Model A B C D A B C D
DF-80 6 40 38 40 16 102 97 102
DF-100 6 50 44 50 16 127 112 127
DF-125 6 54 48 54 16 138 122 138
DF-150 6 55 50 55 16 140 127 140
DF-175 - UNAPPROVED - - UNAPPROVED -
DF-200 - UNAPPROVED - - UNAPPROVED -
C
BD
A

SECTION 3: CLEARANCES TO COMBUSTIBLES
9
NOTE: 1. All dimensions are from the surfaces of all tubes, couplings and elbows.
2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream
from where the burner and burner tube connect.
FIGURE 12: Venting
(inches) (centimeters)
Model A E F A E F
DF-80 20 24 18 51 61 46
DF-100 20 24 18 51 61 46
DF-125 20 24 18 51 61 46
DF-150 20 30 18 51 77 46
DF-175/200 20 30 18 51 77 46
Radiant Tubes
Vent
Pipes
Unvented
Vented
AE
F

DF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
10
SECTION 4: NATIONAL STANDARDS AND
APPLICABLE CODES
4.1 Gas Codes
Type of gas appearing on the nameplate must be
the type of gas used. Installation must comply
with national and local codes and requirements
of the local gas company.
United States: Refer to National Fuel Gas Code
NFPA 54/ANSI Z223.1 - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code CSA B149.1 - latest revision.
4.2 Aircraft Hangars
Installation in aircraft hangars must be in
accordance with the following codes:
United States: Refer to Standard for Aircraft
Hangars, NFPA 409 - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code CSA B149.1 - latest revision.
In aircraft storage and servicing areas, heaters
shall be installed at least 10' (3 m) above the
upper surface of wings or of engine enclosures
of the highest aircraft which may be housed in
the hangar. The measurement shall be made
from the wing or engine enclosure (whichever is
higher from the floor) to the bottom of the heater.
• In shops, offices and other sections of aircraft
hangars communicating with aircraft storage or
servicing areas, heaters shall be installed not
less than 8' (2.4 m) above the floor.
• Suspended or elevated heaters shall be so
located in all spaces of aircraft hangars that they
shall not be subject to injury by aircraft, cranes,
movable scaffolding or other objects. Provisions
shall be made to assure accessibility to
suspended heaters for recurrent maintenance
purposes.
4.3 Public Garages
Installation in garages must be in accordance
with the following codes:
United States: Refer to Standard for Parking
Structures NFPA 88A - latest revision or the
Code for Motor Fuel Dispensing Facilities and
Repair Garages, NFPA 30A - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code CSA B149.1 - latest revision.
• Heaters must not be installed less than 8'
(2.4 m) above the floor. Minimum clearances to
combustibles must be maintained from vehicles
parked below the heater.
• When installed over hoists, minimum
clearances to combustibles must be maintained
from the upper most point of objects on the hoist.
4.4 Electrical
Heater must be electrically grounded in
accordance with the following codes:
United States: Refer to National Electrical Code®,
NFPA 70 - latest revision. Wiring must conform to
the most current National Electrical Code®, local
ordinances and any special diagrams furnished.
Canada: Refer to Canadian Electrical Code,
CSA C22.1 Part 1 - latest revision.
4.5 Venting
Venting must be installed in accordance with the
requirements within this manual and the
following codes:
United States: Refer to National Fuel Gas Code
NFPA 54/ANSI Z223.1 - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code CSA B149.1 - latest revision.
4.6 High Altitude
These heaters are approved for installations up
to 2000' (610 m) (US), 4500' (1370 m) (Canada)
without modification. Consult factory if US
installation is above 2000' (610 m) or Canadian
installation is above 4500' (1370 m).

SECTION 5: MAJOR COMPONENTS
11
SECTION 5: MAJOR COMPONENTS
FIGURE 13: Major Component Descriptions - Standard Reflector
Burner with Tube Gasket
Must be installed with the
flame observation window
facing down.
Standard Reflector
(Aluminum or Stainless Steel)
Alternate overlap as shown on overview
and on Page 18, Figure 17. Minimum
overlap is 6'' (16 cm).
Tube and Reflector Hanger
with Clamp Package
Position this hanger no more
than 4” (10 cm) away from the
burner.
Coupling Assembly with Lock
Reflector End Cap
Punch out center section to
accommodate tube.
Tube and Reflector Hanger
Suspend system from these
hangers.
Flex Gas Line with
Shut Off Cock
Tube
Hot rolled or heat treated
aluminized tube supplied in
10' (3 m) lengths.
Burner Tube
Supplied in 10' (3 m) lengths.
Burner tube is always the first
tube after the burner.
Reflector Support Strap &
Wire Form Turbulator/Swirler
Install turbulator/swirler as
specified in the "Turbulator and
Swirler Installation" charts. See
Pages 23 and 24.
Vent Adapter

DF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
12
FIGURE 14: Major Component Descriptions - High Efficiency Reflector
Burner with Tube Gasket
Must be installed with the
flame observation window
facing down.
High Efficiency Reflector
(Aluminum only)
Alternate overlap as shown on
overview and on Page 18, Figure 17.
Minimum overlap is 6'' (16 cm).
Tube and Reflector Hanger
with Clamp Package-EF
Position this hanger no more
than 4” (10 cm) away from the
burner.
Coupling Assembly with Lock
Reflector End Cap-EF
Punch out center section to
accommodate tube.
Tube and Reflector Hanger-EF
Suspend system from these
hangers.
Flex Gas Line with
Shut Off Cock
Tube
Hot rolled or heat treated
aluminized tube supplied in
10' (3 m) lengths.
Burner Tube
Supplied in 10' (3 m) lengths.
Burner tube is always the first
tube after the burner.
Reflector Support Strap &
Wire Form-EF Turbulator/Swirler
Install turbulator/swirler as
specified in the "Turbulator and
Swirler Installation" charts. See
Pages 23 and 24.
Vent Adapter

SECTION 5: MAJOR COMPONENTS
13
5.1 Standard Parts List
*Canadian models: Rubber (Type 1) Gas Hoses available as an accessory. See Page 50.
Table 1: Contents of DF-Series Burner Carton
Part No. Description DF-80 DF-100 DF-125 DF-150 DF-175 DF-200
073XXXXX Burner (Rate and Fuel Varies) 1 1 1 1 1 1
90709700 Blower Assembly with Cord 1 1 1 1 1 1
02568200 Gasket (Burner to Burner Tube) 1 1 1 1 1 1
90709801 Gasket (Blower to Burner) 1 1 1 1 1 1
173101NA Installation, Operation and Service Manual 1 1 1 1 1 1
91201708 Pipe Nipple (Black) 1/2" NPT x 4" 1 1 1 1 1 1
94273914 Hex Head Bolts 5/16" - 18 Rolok 4 4 4 4 4 4
96411600 Split Lock Washer 4 4 4 4 4 4
*91412200 Flexible Stainless Steel Gas Hose, 1/2" NPT (US Models Only) 1 1 1 - - -
91412203 Flexible Stainless Steel Gas Hose, 3/4" NPT (US Models Only) - - - 1 1 1
91907302 S-Hooks 2 2 2 2 2 2
91911704 Outside Air Collar 1 1 1 1 1 1
94118106 #8 x 3/8 Hex Washer Head (for Outside Air Collar) 3 3 3 3 3 3
92311800 Keps Nut 4 4 4 4 4 4
03051501 Turbulator Adapter 1 1 1 1 - -
03051502 Turbulator 2.5' (76 cm), Aluminized Steel 4 2 3 2 - -
**03051509K Swirler Package - 10' (3 m) (Contains Qty 2 - 62" Swirlers) - - - - - 1
**03051510K Swirler Package - 15' (4.5 m) (Contains Qty 3 - 62" Swirlers) - - - - 1 -
Table 2: Contents of Standard Core and Extension Packages
Core Packages Extension Packages
Aluminized Aluminized
Part No. Description 10
'
(3m)
20 '
(6m)
30 '
(9m)
40 '
(12m)
10 '
(3m)
20 '
(6m)
30 '
(9m)
40 '
(12m)
91409408 Tube, HT Aluminized, 10
' (3 m) -1231234
03051101 Burner Tube, ALUMI-THERM
®
Steel, 10 ' (3 m) - - 1 1 - - - -
03051601 Burner Tube, HT ALUMI-THERM
®
Steel, 10 ' (3 m) 1 1 - - - - - -
01312700 Coupling Assembly - 1 2 3 1 2 3 4
02750303 Standard Reflector, 8
' (3.5 m) 23462346
02750800 End Cap 2 2 2 2 - - - -
03090100 Tube and Reflector Hanger 2 3 4 5 1 2 3 4
91907302 S-Hook 2 3 4 5 1 2 3 4
03050010 Reflector Support Package (Strap, Wire Form, Screws) 1 2 3 5 2 3 4 6
91107720 U-Clip Package 1 1 1 1 1 1 1 1
90502701 Vent Adapter 1 1 1 1 - - - -
01318901 Tube Clamp Package 1 1 1 1 - - - -
Part Number
CP10ALUM CP20ALUM CP30ALUM CP40ALUM
EXP10ALUM
EXP20ALUM
EXP30ALUM
EXP40ALUM

DF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
14
Table 3: Contents of High Efficiency Core and Extension Packages
Additional tubing length may be added to heater. Tubing must be heat-treated, aluminized or porcelain
coated. Any additional tubing lengths are considered as vent length for length determination. Maximum
venting length for minimum heater length is 45' (13.7 m) total.
Core Packages Extension Packages
Aluminized Aluminized
Part No. Description 10
'
(3m)
20 '
(6m)
30 '
(9m)
40 '
(12m)
10 '
(3m)
20 '
(6m)
30 '
(9m)
40 '
(12m)
91409408 Tube, HT Aluminized, 10
' (3 m) -1231234
03051101 Burner Tube, ALUMI-THERM
®
Steel, 10 ' (3 m) - - 1 1 - - - -
03051601 Burner Tube, HT ALUMI-THERM
®
Steel, 10 ' (3 m) 1 1 - - - - - -
01312700 Coupling Assembly - 1 2 3 1 2 3 4
02750313 High Efficiency Reflector, 8
' (3.5 m) 23462346
02750802 End Cap-EF 2 2 2 2 - - - -
03090102 Tube and Reflector Hanger-EF 2 3 4 5 1 2 3 4
91907302 S-Hook 2 3 4 5 1 2 3 4
03050012 Reflector Support Package-EF (Strap, Wire Form,
Screws)
12352346
91107720 U-Clip Package 1 1 1 1 1 1 1 1
90502701 Vent Adapter 1 1 1 1 - - - -
01318902 Tube Clamp Package-EF 1 1 1 1 - - - -
Part Number
CP10ALUMEF CP20ALUMEF CP30ALUMEF CP40ALUMEF
EXP10ALUMEF EXP20ALUMEF EXP30ALUMEF EXP40ALUMEF
Table 4: DF-Series Component Package Guide
Model Tubing Length Standard Reflector Core
Packages
High Efficiency Reflector
Core Packages
Minimum Aluminized Aluminized
DF-80 20' (6 m) CP20ALUM CP20ALUMEF
DF-100 30' (9 m) CP30ALUM CP30ALUMEF
DF-125 30' (9 m) CP30ALUM CP30ALUMEF
DF-150 40' (12 m) CP40ALUM CP40ALUMEF
DF-175 40' (12 m) CP40ALUM CP40ALUMEF
DF-200 50' (15 m) CP30ALUM + EXP20ALUM CP30ALUMEF + EXP20ALUMEF

SECTION 6: HEATER INSTALLATION
15
SECTION 6: HEATER INSTALLATION
To ensure your safety and comply with the terms of
the warranty, all units must be installed in
accordance with these instructions.
The gas or the electrical supply lines must not be
used to support the heater.
Do not locate the gas or electric supply lines directly
over the path of the flue products from the heater.
The heater must be installed in a location that it is
readily accessible for servicing.
The heaters must be installed in accordance with
clearances to combustibles as indicated on the rating
plate and in this instruction manual.
The minimum and maximum gas inlet pressures
must be maintained as indicated on the rating plate.
Typical installation configurations are shown on
Page 16, Figure 15.
Expansion and contraction of the tube dictates that
the minimum suspension lengths must be
maintained. See table on Page 16, Figure 15.
WARNING
Severe Injury Hazard
Secure burner to burner tube with nuts and
lockwashers.
Hang heater with materials with a minimum
working load of 75 lbs (33 kg).
Failure to follow these instructions can result
in death, injury or property damage.
WARNING
Cut/Pinch Hazard
Wear protective gear during installation,
operation and service.
Edges are sharp.
Failure to follow these instructions can result
in injury.

DF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
16
FIGURE 15: Critical Hanger Placement
NOTE: Suspension material provided by others.
Description Part Number
S-Hook 91907302
Tube/Reflector Hanger 0309010X
Run Length Typical Expansion Minimum “X” Length
10' (3 m) - 50' (15.2 m) ±1" (3 cm) 12" (30.5 cm)
51' (15.5 m) - 60' (18.3 m) ±2" (5 cm) 18" (45.7 cm)
61' (18.6 m) - 80' (24.4 m) ±3" (8 cm) 24" (61 cm)