Roberts Gorden NDUSTRIA NHE Series Manual

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.
NDUSTRIA
100 Seven Mile Rd NW
Comstock Park, MI 49321
Telephone: [phone]
www.ndustria.com
© 2021 Ndustria
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.
Model NHE
Gas-Fired, Low Intensity
Unitary Heater for Harsh
Environments
Installation, Operation &
Service Manual
NHE-40
NHE-60
NHE-80
NHE-100
NHE-125
NHE-150
NHE-175
P/N N138100NA Rev A 8/21

© 2021 Ndustria
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 Ndustria.
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......................................3
2.1 Wall Tag .......................................................................3
2.2 Corrosive Chemicals.................................................... 3
2.3 National Standards and Applicable Codes...................3
SECTION 3: Clearances to Combustibles.............................4
3.1 Required Clearances to Combustibles......................... 4
SECTION 4: National Standards and Applicable Codes...... 8
4.1 Gas Codes................................................................... 8
4.2 Aircraft Hangars ........................................................... 8
4.3 Public Garages ............................................................8
4.4 Electrical ......................................................................8
4.5 Venting.........................................................................8
4.6 High Altitude ................................................................ 8
SECTION 5: Major Components ............................................9
5.1 Standard Parts List .................................................... 11
SECTION 6: Heater Installation............................................ 14
6.1 Outdoor Mounting...................................................... 16
SECTION 7: Optional Heater Accessories .......................... 26
7.1 U-Tube Configuration.................................................. 26
7.2 Elbow Package Configuration..................................... 30
7.3 Reflector Side Extension (Not for outdoor use
or areas exposed to wind)........................................... 32
7.4 Lower Clearance Shield Installation ...........................33
7.5 Two-Foot Decorative Grille Installation ....................... 33
7.6 Protective Grille Installation ........................................ 35
SECTION 8: Venting .............................................................. 44
8.1 General Venting Requirements ..................................44
8.2 Unvented Operation...................................................47
8.3 Horizontal Venting......................................................47
8.4 Vertical Venting .......................................................... 47
8.5 Unvented Operation Tube Termination....................... 47
8.6 Length Requirements ................................................ 47
8.7 Venting Options..........................................................49
8.8 Horizontal Ventilation 4" (10 cm) Pipe........................50
8.9 Vertical Ventilation 4" (10 cm) Pipe ............................ 50
8.11 Common Vertical Venting ........................................ 53
8.12 Outside Combustion Air Supply ...............................54
SECTION 9: Gas Piping ........................................................57
SECTION 10: Wiring .............................................................. 59
10.1 Line Voltage Thermostat Wiring ...............................60
10.2 Low Voltage Thermostat with One Burner ............... 60
10.3 Low Voltage Thermostat Wiring with
Multiple Burners ...................................................... 61
10.4 Internal Wiring.......................................................... 61
10.5 Ladder Diagram....................................................... 61
10.6 Electrical Connection to the Burner Box using Line
Voltage Thermostat on Control ........................................ 62
10.7 Electrical Connection to Burner Box using
Low Voltage Thermostat on Control......................... 62
SECTION 11: Operation and Maintenance.......................... 63
11.1 Sequence of Operation ............................................ 63
11.2 To Shut Off Heater .................................................... 63
11.3 To Start Heater ......................................................... 63
11.4 Pre-Season Maintenance and Annual Inspection..... 63
11.5 Maintenance Checklist ............................................. 63
SECTION 12: Troubleshooting ............................................. 66
12.1 Troubleshooting Flow Chart ..................................... 66
12.2 Manifold Gas Pressure Setting ................................ 69
SECTION 13: Replacement Parts ........................................ 70
SECTION 14: General Specifications .................................. 72
14.1 Material Specifications............................................. 72
14.2 Heater Specifications............................................... 72
14.3 Suspension Specifications....................................... 72
14.4 Controls Specifications ............................................ 72
SECTION 15: The NDUSTRIA™ NHE
Warranty.......................................................... 73
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 possi-
ble 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 installa-
tion and service of gas-fired heating equipment.
Read this manual carefully before installation, opera-
tion 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 the local distribution
conditions, nature of gas and pressure, and adjust-
ment 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 NDUSTRIA.
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 NDUSTRIA or your NDUSTRIA™
independent distributor to obtain
replacement signs or labels.
1.3 California Proposition 65
In accordance with California Proposition 65 require-
ments, a warning label must be placed in a highly
visible location on the outside of the equipment (i.e.,
near equipment’s serial plate). Avoid placing label on
areas with extreme heat, cold, corrosive chemicals or
other elements. To order additional labels, please
contact NDUSTRIA or your NDUSTRIA™ indepen-
dent distributor.

NHE-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
2
FIGURE 1: Serial Number Identification Chart
2103-038-150-0456
Manufactured
Year
Manufactured
Month
Numerical
Model Number
Burner Maximum
Firing Rate (MBH)
Numerical sequence
of units manufactured for
the month of the given product
Serial numbers are located on both the burner shipping carton and the data plate. Each burner will have a unique 14-digit serial
number used for identification purposes to allow the lookup of various items such as manufacture test records, replacement part
identification, and manufactured date.

SECTION 2: INSTALLER RESPONSIBILITY
3
SECTION 2: INSTALLER RESPONSIBILITY
The installer is responsible for the following:
• To install the heater, as well as the gas and electri-
cal supplies, in accordance with applicable specifi-
cations and codes. NDUSTRIA 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 to burners for servicing on all
sides for burner removal.
• To provide the owner with a copy of this installa-
tion, operation and service manual.
• To never use heater as support for a ladder or
other access equipment and never hang or sus-
pend anything from heater.
• To ensure there is adequate air circulation around
the heater and to supply air for combustion, venti-
lation 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 a 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 com-
bustibles. Please contact NDUSTRIA or your NDU-
STRIA™ 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
NDUSTRIA™ 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. See Page 4, Figure 2 through Page
7, 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
NDUSTRIA 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 com-
pounds 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 compo-
nents 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.

NHE-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
4
SECTION 3: CLEARANCES TO COMBUSTIBLES
3.1 Required Clearances to Combustibles
Clearances are the required distances that combusti-
ble 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 clear-
ances to combustibles at all times for safety.
Clearances for all heater models are located on the
burner of the heater and on Page 4, Figure 2 through
Page 7, Figure 11 in this manual. Check the clear-
ances 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 appli-
ance.
• The stated clearances to combustibles represents
a surface temperature of 90° F (32°C) above room
temperature. Building materials with a low heat tol-
erance (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 com-
bustibles. 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 instal-
lation when there is a possibility of exposure to
combustible airborne materials or vapors.
• Hang heater in accordance to the minimum sus-
pension requirements on Page 14, Figure 13.
• 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.
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.
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.
FIGURE 2: LEVEL REFLECTOR
(inches) (centimeters)
Model ABCDABCD
NHE-40 6 27 53 27 16 69 135 69
NHE-60 6 35 63 35 16 89 161 89
NHE-80 6 38 66 38 16 97 168 97
NHE-100 6 40 71 40 16 102 181 102
NHE-125 6 46 77 46 16 117 196 117
NHE-150 6 50 80 50 16 127 204 127
NHE-175 8 52 82 52 21 133 209 133

SECTION 3: CLEARANCES TO COMBUSTIBLES
5
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 SIDE REFLECTOR
(inches) (centimeters)
Model ABCDABCD
NHE-40 6 9 53 44 16 23 135 112
NHE-60 6 9 63 47 16 23 161 120
NHE-80 6 9 70 54 16 23 178 138
NHE-100 6 9 77 59 16 23 196 150
NHE-125 6 9 83 65 16 23 211 166
NHE-150 6 9 86 69 16 23 219 176
NHE-175 8 9 88 73 21 23 224 186
A
C
D
B
FIGURE 4: TWO SIDE REFLECTORS
(inches) (centimeters)
Model ABCDABCD
NHE-40 6 15 53 15 16 39 135 39
NHE-60 6 23 66 23 16 59 168 59
NHE-80 6 25 72 25 16 64 183 64
NHE-100 6 27 78 27 16 69 199 69
NHE-125 6 32 84 32 16 82 214 82
NHE-150 6 35 88 35 16 89 224 89
NHE-175 8 40 91 40 21 102 232 102
A
C
D
B
FIGURE 5: 45° TILT REFLECTOR
(inches) (centimeters)
Model ABCDABCD
NHE-40 8 8 51 46 21 21 130 117
NHE-60 8 8 60 54 21 21 153 138
NHE-80 8 8 66 60 21 21 168 153
NHE-100 10 8 74 64 26 21 188 163
NHE-125 10 8 78 69 26 21 199 176
NHE-150 12 8 84 74 31 21 214 188
NHE-175 12 8 85 79 31 21 216 201

NHE-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 6: U-TUBE, LEVEL REFLECTOR
(inches) (centimeters)
Model ABCDABCD
NHE-40 - UNAPPROVED - - UNAPPROVED -
NHE-60 6 35 63 30 16 89 161 77
NHE-80 6 38 69 37 16 97 176 94
NHE-100 6 40 76 39 16 102 194 100
NHE-125 6 46 79 43 16 117 201 110
NHE-150 6 50 84 47 16 127 214 120
NHE-175 8 54 87 51 21 138 221 130
A
CD
B
FIGURE 7: U-TUBE, 45°
(inches) (centimeters)
Model ABCDABCD
NHE-40 - UNAPPROVED - - UNAPPROVED -
NHE-60 8 8 60 42 21 21 153 107
NHE-80 8 8 66 46 21 21 168 117
NHE-100 8 8 74 52 21 21 188 133
NHE-125 8 8 78 61 21 21 199 155
NHE-150 8 8 84 66 21 21 214 168
NHE-175 8 8 85 70 21 21 216 178
B
C
D
A
FIGURE 8: U-TUBE, OPPOSITE 45° REFLECTOR
(inches) (centimeters)
Model ABCDABCD
NHE-40 - UNAPPROVED - - UNAPPROVED -
NHE-60 8 54 60 22 21 138 153 56
NHE-80 8 60 66 22 21 153 168 56
NHE-100 10 64 74 22 26 163 188 56
NHE-125 10 70 78 22 26 178 199 56
NHE-150 12 74 84 22 31 188 214 56
NHE-175 12 76 85 22 31 194 216 56
A
C
D
B

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.
*When installed in the first 10' (3 m).
FIGURE 9: 2-FOOT DECO GRILLE AND PROTECTIVE GRILLE
(inches) (centimeters)
Model ABCDABCD
NHE-40 6 27 53 27 16 69 135 69
NHE-60 6 35 63 35 16 89 161 89
NHE-80 6 38 66 38 16 97 168 97
NHE-100 6 40 71 40 16 102 181 102
NHE-125 6 46 77 46 16 117 196 117
NHE-150 6 50 80 50 16 127 204 127
NHE-175 8 52 82 52 21 133 209 133
A
C
D
B
FIGURE 10: LOWER CLEARANCE SHIELD*
(inches) (centimeters)
Model ABCDABCD
NHE-40 6 34 27 34 16 87 69 87
NHE-60 6 39 33 39 16 100 84 100
NHE-80 6 40 38 40 16 102 97 102
NHE-100 6 50 44 50 16 127 112 127
NHE-125 6 54 48 54 16 138 122 138
NHE-150 6 55 50 55 16 140 127 140
NHE-175 - UNAPPROVED - - UNAPPROVED -
A
C
D
B
FIGURE 11: VENTING
(inches) (centimeters)
Model A E F A E F
NHE-40 14 18 18 36 46 46
NHE-60 14 18 18 36 46 46
NHE-80 20 24 18 51 61 46
NHE-100 20 24 18 51 61 46
NHE-125 20 24 18 51 61 46
NHE-150 20 30 18 51 77 46
NHE-175 20 30 18 51 77 46
Radiant Tubes
Vent
Pipes
Unvented
Vented
AE
F

NHE-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
8
SECTION 4: NATIONAL STANDARDS AND
APPLICABLE CODES
4.1 Gas Codes
The 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 (whicNHEer
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
The 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
The 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
9
SECTION 5: MAJOR COMPONENTS
FIGURE 12: Major Component Descriptions
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 17, Figure 16. 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.
Reflector Support Strap &
Wire Form
Vent Adapter
Burner Tube
Supplied in 10' (3 m) lengths.
Burner tube is always the first
tube after the burner.
Combustion Air
Weather Vent
Attach at flue end
and air inlet
where required.
Turbulator/Swirler
Install turbulator/Swirler as
specified in the "Turbulator/
Swirler Installation" chart. See
Page 21 and Page 22.

NHE-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
10
5.1 Standard Parts List
Table 1: Contents of the Burner Carton
*Canadian Models: Rubber (Type 1) Gas Hoses available as an accessory. See Page 54, Section 9.
**Contents located in box separate from burner
Part No. Description NHE-40 NHE-60 NHE-80 NHE-100 NHE-125 NHE-150 NHE-175
038XXXXX Burner Assembly (Rate and Fuel Varies) 1 1 1 1 1 1 1
02568200 Gasket (Burner to Burner Tube) 1 1 1 1 1 1 1
138100NA Installation, Operation and Service Manual 1 1 1 1 1 1 1
03700009 Combustion Air Weather Vent 1 1 1 1 1 1 1
94273914 Hex Head Bolts 5/16" - 18 Rolok 4 4 4 4 4 4 4
96411600 Split Lock washer 4 4 4 4 4 4 4
91221100 Pipe Nipple (Galvanized) 1/2” NPT x 4” 1 1 1 1 1 1 1
91309701 Grommet - Liquid Tight 1 1 1 1 1 1 1
*91412204 36" Vinyl Coated Flexible Stainless Steel Gas Hose - 3/4" NPT
(US Models Only)
1 1 1 1 1 1 1
03051501 Turbulator Adapter 1 1 1 1 - - -
03051502 Turbulator 2.5' (76 cm), Aluminized Steel 2 4 4 2 - - -
03051505 Turbulator 2.5' (76 cm), Stainless Steel 1 - - - - - -
**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
**03051511K Swirler Package - 20' (6 m) (Contains Qty 4 - 62" Swirlers) - - - - 1 - -

SECTION 5: MAJOR COMPONENTS
11
Table 2: Contents of Standard Core and Extension Packages
* Optional with the aluminized core package.
Core Packages Extension Packages
Aluminized with
Aluminum
Reflector
Aluminized with
Stainless Steel
Reflector
Aluminized with
Aluminum
Reflector
Aluminized with
Stainless Steel
Reflector
Part No. Description 10'
(3 m)
20'
(6 m)
30'
(9 m)
40'
(12 m)
10'
(3 m)
20'
(6 m)
30'
(9 m)
40'
(12 m)
10'
(3 m)
20'
(6 m)
30'
(9 m)
40'
(1 2m)
10'
(3 m)
20'
(6 m)
30'
(9 m)
40'
(12 m)
91409408 Tube, HT Aluminized, 10' (3 m) - 1 2 3 - 1 2 3 1 2 3 4 1 2 3 4
03051101 Burner Tube, ALUMI-THERM
®
Steel,
10' (3 m)
--11------------
03051102 Burner Tube, ALUMI-THERM
®
Steel,
10' (3 m)
------11--------
03051601 Burner Tube, HT ALUMI-THERM
®
Steel, 10' (3 m)
11--------------
03051602 Burner Tube, HT ALUMI-THERM
®
Steel - HE, 10' (3m)
----11----------
01312700 Coupling Assembly - 1 2 3 - 1 2 3 1 2 3 4 1 2 3 4
02750303 Standard Reflector, 8' (3.5 m) 2 3 4 6 - - - - 2 3 4 6 - - - -
027503SS* Stainless Steel Reflector, 8' (3.5 m) - - - - 2 3 4 6 - - - - 2 3 4 6
02750800 End Cap 2 2 2 2 - - - - - - - - - - - -
027508SH* Stainless Steel End Cap with Hole - - - - 2 2 2 2 - - - - - - - -
03090100 Tube and Reflector Hanger 2 3 4 5 2 3 4 5 1 2 3 4 1 2 3 4
91907302 S-Hook 2 3 4 5 2 3 4 5 1 2 3 4 1 2 3 4
03050010 Reflector Support Package
(Strap, Wire Form, Screws)
1235245723462346
91107720 U-Clip Package 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
90502701 Vent Adapter 1 1 1 1 1 1 1 1 - - - - - - - -
01318901 Tube Clamp Package 1 1 1 1 2 2 2 2 - - - - - - - -
Part Number
CP10ALUM CP20ALUM CP30ALUM CP40ALUM
CP10ALUMSS CP20ALUMSS
CP30ALUMSS CP40ALUMSS
EXP10ALUM
EXP2OALUM
EXP30ALUM
EXP40ALUM
EXP10ALUMSS EXP20ALUMSS EXP30ALUMSS EXP40ALUMSS

NHE-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
12
Table 3: Component Package Guide
Although not recommended, additional tube lengths may be added to the heater. Tubing must be aluminized
(heat-treated), or porcelain coated. Additional tube lengths beyond the specified minimum tubing length are
considered vent pipe for length determination. Maximum vent length allowed is 45' (13.7 m) total.
Model Tubing Length Standard Core Packages
Minimum Aluminized Stainless Steel
NHE-40 10’ (3m) CP10ALUM CP10ALUM
NHE-60 20’ (6m) CP20ALUM CP20ALUM
NHE-80 20’ (6m) CP20ALUM CP20ALUM
NHE-100 30’ (9m) CP30ALUM CP30ALUM
NHE-125 30’ (9m) CP30ALUM CP30ALUM
NHE-150 40’ (12m) CP40ALUM CP40ALUM
NHE-175 50’ (15m) CP30ALUM + EXP20ALUM CP30ALUM + EXP20ALUMSS

SECTION 6: HEATER INSTALLATION
13
SECTION 6: HEATER INSTALLATION
To ensure your safety, and comply with the terms of
the warranty, all units must be installed in accor-
dance 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 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 in
Figure 13.
Expansion and contraction of the tube dictates that
the minimum suspension lengths in the table on
Page 14, Figure 13 be maintained.
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.

NHE-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
14
FIGURE 13: Critical Hanger Placement
Description Part Number
S-Hook 91907302
Tube/Reflector Hanger 030901XX
Run Length Typical Expansion Minimum “X” Length
10' (3 m) - 50' (15 m) ±1" (3 cm) 12" (305 mm)
51' (15 m) - 60' (18 m) ±2" (5 cm) 18" (457 mm)
61' (18 m) - 70' (24 m) ±3" (8 cm) 24" (609 mm)

SECTION 6: HEATER INSTALLATION
15
6.1 Outdoor Mounting
The heater is meant for stationary mounting in all sit-
uations and should not be suspended from any struc-
ture which may become mobile or from any organic
structures such as trees. Clearances to combustibles
must be maintained in all cases; do not install heat-
ers in a location such as a parking area, where a
vehicle with a painted or non-metallic upper surface,
may be parked within the clearances to
combustibles. See Page 15, Figure 14.
The bottom of the combustion air inlet shall not be
less than 12" (30 cm) above a surface which could
support snow, ice, or debris.
FIGURE 14: Critical Hanger Placement (Outdoor Installation)
NOTE: High efficiency reflectors should NOT be used in applications exposed to wind.

NHE-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
16
FIGURE 15: Linear Heater Assembly Overview
Tube
Reflector
Reflector End Cap
Reflector Support
Burner
Coupling
U-Clips
Burner Tube
Tube and Reflector Hanger
Tube Clamp
Package
Vent Adapter
Turbulator
(with Select Models)