Roberts Gorden COMPLETE HED 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.
Roberts-Gordon LLC
1250 William Street
P. O . B o x 4 4
Buffalo, New York 14240-0044
Telephone: [phone]
Fax: [phone]
Toll Free: 800.828.7450
www.robertsgordon.com
© 2018 Roberts-Gordon LLC
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 HED
Gas-Fired, Low Intensity
Unitary Heater
For Harsh Environments
Installation, Operation &
Service Manual
HED-40
HED-60
HED-80
HED-100
HED-125
HED-150
HED-175
P/N 037100NA RevA 6/18

© 2018
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 ..... 9
4.1 Gas Codes...................................................................9
4.2 Aircraft Hangars ........................................................... 9
4.3 Public Garages ............................................................ 9
4.4 Electrical ...................................................................... 9
4.5 Venting......................................................................... 9
4.6 High Altitude ................................................................ 9
SECTION 5: Major Components .......................................... 10
5.1 Standard Parts List .................................................... 12
SECTION 6: Heater Installation............................................ 15
6.1 Outdoor Mounting...................................................... 17
SECTION 7: Optional Heater Accessories.......................... 27
7. 1 U - Tube Configuration.................................................. 27
7.2 ElbowPackage Configuration..................................... 31
7.3 Reflector Side Extension ............................................ 33
7. 4 L o wer Clearance Shield Installation ...........................34
7. 5 Two-Foot Decorative Grille Installation .......................34
7.6 Protective Grille Installation ........................................ 36
SECTION 8: Venting.............................................................. 37
8.1 General Venting Requirements.................................. 37
8.2 Unvented Operation................................................... 37
8.3 Horizontal Venting...................................................... 38
8.4 Vertical Venting .......................................................... 38
8.5 Unvented Operation Tube Termination ...................... 38
8.6 Length Requirements ................................................ 38
8.7 Horizontal Ventilation 4" (10 cm) Pipe........................ 40
8.8 Vertical Ventilation 4" (10 cm) Pipe............................ 41
8.10 Common Vertical Venting ........................................ 42
8.11 Outside Combustion Air Supply ............................... 43
SECTION 9: Gas Piping........................................................ 45
SECTION 10: Wiring.............................................................. 47
10.1 Line Voltage Thermostat Wiring............................... 47
10.2 LowVoltage Thermostat with One Burner ............... 47
10.3 LowVoltage Thermostat Wiring with Multiple
Burners .................................................................... 48
10.4 Electrical Connection to the Burner Box Using Line
Voltage Thermostat on Control ................................ 49
10.5 For External Thermostat Connection....................... 49
10.6 Electrical Connection to Burner Box with Optional
External LowVoltage Thermostat.................................... 49
10.7 Internal Wiring.......................................................... 50
10.8 Ladder Diagram....................................................... 50
SECTION 11: Operation and Maintenance.......................... 51
11. 1 S e q uence of Operation ............................................ 51
11.2 To Shut Off Heater.................................................... 51
11.3 To Start Heater ......................................................... 51
11.4 Pre-Season Maintenance and Annual Inspection..... 51
11.5 Maintenance Checklist ............................................. 52
SECTION 12: Troubleshooting............................................. 54
12.1 Troubleshooting FlowChart..................................... 55
12.2 Manifold Gas Pressure Setting ................................ 57
SECTION 13: Replacement Parts ........................................ 58
SECTION 14: General Specifications.................................. 60
14.1 Material Specifications............................................. 60
14.2 Heater Specifications............................................... 60
14.3 Suspension Specifications....................................... 60
14.4 Controls Specifications ............................................ 60
SECTION 15: The ROBERTS GORDON®COMPLETE™
HED Warranty ................................................ 61
Printed in U.S.A.

TABLE OF FIGURES
Figure 1: Top and Bottom Panel Label Placement .................... 2
Figure 2: Side and Back Panel Label Placement......................3
Figure 13: Major Component Descriptions - Standard
Reflector ................................................................ 10
Figure 14: Major Component Descriptions - High Efficiency
Reflector................................................................. 11
Figure 15: Critical Hanger Placement ..................................... 16
Figure 16: Critical Hanger Placement (Outdoor Installation)... 17
Figure 17: Linear Heater Assembly Overview........................ 18
Figure 18: Linear Heater Layout Overview.............................. 19
Figure 19: Linear Heater Layout Overview(Continued) .......... 20
Figure 20: U-Tube Heater Assembly Overview...................... 28
Figure 21: U-Tube Heater Layout Overview............................ 29
Figure 22: U-Tube Heater Layout Overview(Continued) ........ 30
Figure 23: Reflector Joint Detail .............................................. 32
Figure 24: Tube Termination ................................................... 38
Figure 25: Combustion Air Weather Vent (P/N 03700009) ..... 39
Figure 26: Venting Options...................................................... 40
Figure 27: Gas Connection with Flexible Gas Hose ............... 46
Figure 28: Burner Exploded View........................................... 59

SECTION 1: HEATER S AFETY
1
SECTION 1: HEATER SAFETY
Yo ur Safety is Important to Us!
This symbol is used throughout
the manual to notify youof 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 Roberts-Gordon
LLC.
1.1 Manpower Requirements
To p r event 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 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 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). See label placement
drawing on Page 2, Figure 1 for label location. Avoid
placing label on areas with extreme heat, cold, corro-
sive chemicals or other elements. To order additional
labels, please contact Roberts-Gordon LLC or your
ROBERTS GORDON®independent distributor.

HED-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
2
FIGURE 1: Top and Bottom Panel Label Placement
Description Part Number
Logo Label 91013200
Rating Plate Label 91013220
Gas Connection Label 91018122
Vent Length Label 91039500

SECTION 1: HEATER S AFETY
3
FIGURE 2: Side and Back Panel Label Placement
Description Part Number
Rating Plate Label 91010401
Lighting Instruction Plate Label 91029602
Wiring Label 91030308
Clearances to Combustibles Label 91013432
Proposition 65 Label 91070016

HED-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 electri-
cal supplies, in accordance with applicable specifi-
cations and codes. Roberts-Gordon 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.
•Toensure 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 Roberts-Gordon 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, youmay
affix this copy on the wall near the heater.
Knowyour 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 5, Figure 3 through Page
8, Figure 12. 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 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.