Roberts Gorden Caribe CGTH-30 User 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.
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 safe
distances 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.
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
© 2017 Roberts-Gordon LLC
CGTH-30
CGTH-40
CGTH-50
P/N 180101NA Rev. D 04/17
Gas-Fired, Low-Intensity
Infrared Heaters for Light
Industrial/Commercial
Applications
Use and
Care Manual

© 2017
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: Before You Begin ............................................... 1
1.1 Heater Safety ............................................................... 1
1. 2 Q uestions, Comments or Suggestions......................... 2
SECTION 2: Introduction........................................................ 3
2.1 About Roberts-Gordon LLC ......................................... 3
2.2 About the Heater..........................................................3
2.3 Unpacking the Heater ..................................................3
2.4 Safety Labels and Their Placement............................. 3
2.5 California Proposition 65..............................................3
SECTION 3: Components Identification ............................... 6
SECTION 4: Installation Considerations............................... 7
4.1 Where Can the Heater Be Installed? ........................... 7
4.2 Where Can't the Heater Be Installed?..........................7
4.3 Installer's Responsibility ..............................................7
4.4 Thermostat Tag............................................................ 7
SECTION 5: Heater Installation Requirements..................... 8
5.1 National Standards and Applicable Codes .................. 8
5.2 Gas Service Requirements.......................................... 8
5.3 Electrical Service Requirements.................................. 8
5.4 Venting Requirements.................................................. 9
5.5 Non-Residential Installations ....................................... 9
SECTION 6: Required Safe Distances From
Combustibles................................................... 11
SECTION 7: Installation........................................................ 14
7.1 Choose Location for Heater........................................ 14
7.2 General Venting Guidelines........................................ 14
7.3 Venting ....................................................................... 17
7.4 Typical Installation ...................................................... 19
7.5 Heater Orientation ...................................................... 19
7.6 Protective Grille .......................................................... 21
SECTION 8: Operation.......................................................... 22
8.1 Operating Instructions ............................................... 22
8.2 To Turn Off Gas To Heater ......................................... 22
8.3 Sequence of Operation.............................................. 22
SECTION 9: Troubleshooting............................................... 24
9.1 General ...................................................................... 25
9.2 Basic Heater Care......................................................26
9.3 Replacement Parts .................................................... 27
SECTION 10: The ROBERTS GORDON®CARIBE®
Warranty.......................................................... 29
Printed in the U.S.A.

TABLE OF FIGURES
Figure 1: Bottom and Side Panel Label Placement................... 4
Figure 2: Control Side and Back Panel Label Placement ......... 5
Figure 3: Assembly Overview................................................... 6
Figure 4: Balanced Flue............................................................ 9
Figure 5: Thermostat Tag........................................................ 12
Figure 6: Horizontal Installations............................................. 13
Figure 7: 45° Tilted Installations.............................................. 13
Figure 8: Vent Terminal Locations........................................... 15
Figure 9: Horizontal Venting Through The Wall....................... 17
Figure 10: Horizontal Venting With An Elbow......................... 18
Figure 11: Roof Venting.......................................................... 18
Figure 12: Typical Installation.................................................. 19
Figure 13: Horizontal Installation............................................. 20
Figure 14: 45° Tilted Installation.............................................. 20
Figure 15: Reflector and Grille ................................................ 21

SECTION 1: BEFORE YOU BEGIN
1 of 29
SECTION 1: BEFORE YOU BEGIN
Thank youfor purchasing a ROBERTS GORDON®
heating product. We are pleased youhave chosen
the CGTH-Series overhead tube heater. In addition
to the quality youreceive from our company, youalso
receive years of infrared heating experience.
For years of trouble-free operation from your heater,
carefully read this Use & Care Manual. This Manual
contains valuable information to help youuse the
heater safely and properly.
To obtain warranty service, please complete and mail
the Owner Warranty Registration Card found on the
last page of this manual. In addition to activating your
warranty, registering your heater enables us to con-
tact youwith safety and product updates.
Keep this manual in a safe place in case youhave
any questions or require service in the future. Also,
since proof of purchase is required to obtain warranty
coverage, keep the original sales receipt in a safe
place. Remember to record the model and serial
numbers of your heater below. Model and serial num-
bers are found on the rating tag affixed to the heater.
See Page 3, Section 2 for rating tag location.
1.1 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
installation and service of gas-fired heating
equipment.
Read this manual carefully before installation, opera-
tion or service of this equipment. Improper installa-
tion, service or maintenance can result in death,
injury or property damage.
Check the minimum required safe distances from
combustibles given on the outside of each burner to
make sure that the product is suitable for your appli-
cation. The minimum required safe distances from
combustibles are also found on page 11, section 6 of
this manual. After the installation is complete, check
product operation as provided in these instructions.
This heater must be applied and operated under the
general concepts of reasonable use and installed
using best business practices.
This appliance is not intended for use by persons
(including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowl-
edge, unless they have been given supervision or
instruction concerning use of the appliance by a per-
son responsible for their safety.
Children should be supervised to ensure that they do
not play with the appliance.
For additional copies of the Installation, Operation
and Service Manual, please contact Roberts-Gordon
LLC.
Model Number: Serial Number: Fuel: Installation Date:
Installed By:
Company
Purchased From (if different from installer):
Company
Name Name
Address Address
Phine Phone
Fax Fax
E-mail E-mail

CGTH USE AND CARE MANUAL
2 of 29
1.2 Questions, Comments or Suggestions
Please direct any questions, comments or sugges-
tions to:
Roberts-Gordon LLC
1250 William Street
P. O . B o x 4 4
Buffalo, NewYork 14240-0044
Telephone: [phone]
Fax: [phone]
Toll Free: 800.828.7450
www.robertsgordon.com
www.rg-inc.com
www.radiantheaters.com

SECTION 2: INTRODUCTION
3 of 29
SECTION 2: INTRODUCTION
2.1 About Roberts-Gordon LLC
Roberts-Gordon LLC pioneered low-intensity infrared
heating systems with the introduction of its revolu-
tionary, custom-engineered CORAYVAC®system.
With years of infrared expertise in commercial and
industrial applications, Roberts-Gordon LLC offers
the CGTH-Series heater for use in light industrial/
commercial applications.
2.2 About the Heater
The CGTH-Series is a factory-assembled, gas-fired,
low-intensity heating system that incorporates a bal-
anced flue. The system has been designed for easy
installation and can provide years of economical
operation and trouble-free service. Not only is infra-
red heat efficient, it also provides the most comfort-
able conditions in open areas, such as garages.
Gas-Fired means it uses clean-burning natural or LP
gas.
Low-Intensity means that the radiant surface of the
tube does not glowred. Instead, it operates at a
lower temperature, less than 1000° F (538° C) and
radiates energy at a lower intensity per square foot of
radiating surface. The lower temperature and inten-
sity levels are within a range that is effective in estab-
lishing and maintaining personal comfort levels. An
aluminum reflector directs the radiant energy down-
ward to the occupied area.
Balanced Flue means that the burner draws com-
bustion air from outdoors and exhausts the products
of combustion, also to the outdoors, through a shared
opening. This is accomplished through two concen-
tric tubes.
Radiant refers to the energy radiated by the CGTH-
Series heater. Because the energy is in the form of
infrared rays, it does not directly heat the air. Instead,
the rays heat objects such as the floor, cars, machines
and people. The warm objects, in turn, heat the air.
These combined features are key to the comfort and
fuel efficiency provided by the CGTH-Series heater.
2.3 Unpackingthe Heater
2.3.1 Manpower Requirements
To p r event personal injury and damage to the heater,
two persons will be required to remove the heater
from the carton. Both ends of the heater should be
lifted from the carton at the same time. The burner
should be lifted by gripping the bottom. The reflector
of the heater should be lifted using the hanger.
2.3.2 Safety
Protective gear is to be worn during installation, oper-
ation and service. Thin sheet metal parts, such as
the aluminum reflector portion of the heater and the
various venting components, have sharp edges. To
prevent injury, the use of work gloves is recom-
mended. The use of gloves will also prevent the
transfer of body oils from the hands to the surface of
the reflector.
For additional copies of the Installation, Operation
and Service Manual, please contact Roberts-Gordon
LLC.
2.4 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 ROB-
ERTS GORDON®independent distributor to obtain
replacement signs or labels. See Page 4, Figure 1
through Page 5, Figure 2.
2.5 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 5, Figure 2 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.
WARNING
Cut/Pinch Hazard
Wear protective gear during installation,
operation and service.
Edges are sharp.
Failure to follow these instructions can result
in injury.

CGTH USE AND CARE MANUAL
4 of 29
FIGURE 1: Bottom and Side Panel Label Placement
Side Panel Operating Instruction Label
Logo Label
Bottom Panel
Clearances to
Combustibles Label
Description Part Number
Logo Label 91037702
Operating Instruction Label 91037100
Clearances to Combustibles Label 91037800

SECTION 2: INTRODUCTION
5 of 29
FIGURE 2: Control Side and Back Panel Label Placement
Description Part Number
Shock Hazard Label 91037901
Wiring Diagram Label 91037600
Fire Hazard Label 91037900
Cord Shock Hazard Label 91037500
Thermostat Connection Label 91037902
Carbon Monoxide Hazard label 91037300
Rating Plate Label 91010401
Proposition 64 Warning Label 91070016

CGTH USE AND CARE MANUAL
6 of 29
SECTION 3: COMPONENTS IDENTIFICATION
FIGURE 3: Assembly Overview
Burner - Contains the electrical components (i.e.
blower motor, power transformer, etc.) and gas distri-
bution components (i.e. gas valve, etc.) that make
the heater work. There are no owner serviceable
items contained in this box.
Front Fixed Hanger - Provides rigid support and
mounting surface for the reflector. Holes are provided
in the upper corners of the bulkhead to accommo-
date suspension hardware required for installation of
the heater.
Reflector - The reflector is made from formed alumi-
num and reflects the radiant energy downward, bath-
ing people and objects below.
Heat Exchanger - A U-shaped tube through which
the heated products of combustion pass.
Rear Movable Hanger - Provides support for the tube
and reflector at the end that is furthest from the burner.
The support may be moved (within limits) to accom-
modate hanging of the unit.
Service Door - To be removed only by a contractor
qualified in the installation and service of gas-fired
heating equipment or your gas supplier. Removal of
this service door provides access to the electrical
and gas distribution components.
Gas Line - Must only be installed and serviced by a
licensed contractor or gas fitter.
Wall Termination Plate - Placed on the outside wall
over the venting.
Venting- Installer must properly exhaust the heater
outside. The 5” outer duct carries fresh air to the
burner. The 3” inner duct carries the products of com-
bustion to the outside.
Thermostat - 24 Volt Thermostat mounted with
Thermostat Tag.
Protective Grille - Included with select models. See
Page 21, Section 7.6 for details.
Vent Collar - Accommodates a 5" (125 mm) diame-
ter combustion air inlet duct that delivers fresh air to
the burner. The fresh air enters the burner through
the twelve equally spaced holes shown above. The
3" (80 mm) diameter hole in the center of the flue col-
lar accommodates the venting duct that carries the
products of combustion to be vented outdoors.
Nipple-3/8" (10 mm) NPT - Point at which the gas
supply is connected to the heater.
Thermostat Connection - Two terminals to which
the thermostat wires will be connected.
Power Cord - Includes a three-prong plug that must
be connected to a dedicated and properly grounded
three-prong ceiling outlet.

SECTION 4: INSTALLATION CONSIDERATIONS
7 of 29
SECTION 4: INSTALLATION CONSIDERATIONS
4.1 Where Can the Heater Be Installed?
The CGTH-Series heater is intended for installation
in the following areas:
• Residential applications, such as:
- garages
- hobby greenhouses
- workshops
• Light industrial/commercial applications, such
as:
- entranceways
- lobby areas
- lunch rooms
- aircraft hangars
(See Page 9, Section 5.5.1 for restrictions)
- public garages
(See Page 10, Section 5.5.2 for restrictions)
4.2 Where Can't the Heater Be Installed?
The CGTH-Series heater is not intended for instal-
lation in the following areas:
• Residential living or sleeping areas
• Basements
Due to high temperatures, ensure that the heater
area is kept clear of furniture, draperies, clothing
or other combustible materials. Children and
adults should be alerted to the hazard of high
surface temperatures and should stay away to
avoid burns and clothingignition. Youngchildren
should be carefully supervised when they are in
the same room as the heater.
4.3 Installer's Responsibility
The CGTH-Series heater, the gas and electrical sup-
plies, as well as the venting, must be installed in
accordance with applicable specifications and codes.
In the absence of local codes, the installation must
comply with the National Fuel Gas Code ANSI
7223.1/NFPA-54, Natural Gas and Propane Installa-
tion Code, CSA B149.1. Only firms (or individuals)
well qualified in this type of work should install the
system. Consult local Building Inspectors, Fire Mar-
shals or your local ROBERTS GORDON®indepen-
dent distributor for guidance.
Use the information given in this manual together
with the cited codes and regulations to perform the
installation. The heater must be installed in accor-
dance with the minimum required safe distances
from combustibles and must be vented outside. If any
aspects of the installation are unclear, consult your
ROBERTS GORDON®independent distributor for
clarification. The installer must furnish all needed
materials that are not furnished as standard equip-
ment. It is also the installer's responsibility to see that
the materials and installation methods used result in
a job that is workmanlike in appearance and is in
compliance with the requirements of the Installation,
Operation and Service Manual. The installer must
give this manual and the Installation, Operation and
Service Manual (P/N 180100NA) to the owner.
4.4 Thermostat Tag
A laminated thermostat tag is available for the heater
as a permanent reminder of the safety instructions
and the importance of the minimum required safe
distances from combustibles. Please contact Rob-
erts-Gordon LLC or your ROBERTS GORDON®inde-
pendent distributor to obtain the thermostat tag. Affix
the tag by peeling off the backing of the adhesive
strips on the rear surface and position the tag on a
wall behind the thermostat.
A copy of the thermostat tag (P/N 91037903) is illus-
trated on Page 12, Figure 5.
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 13, Figure 6 through
Page 13, Figure 7.
WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapors the minimum required safe distances
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.

CGTH USE AND CARE MANUAL
8 of 29
SECTION 5: HEATER INSTALLATION REQUIREMENTS
5.1 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.
This section provides the following information:
• Defines the gas, electric and venting requirements
for the CGTH-Series heater.
• Specifies the national standards and applicable
codes that apply to the gas, electric and venting
requirements.
• Specifies the national standards and applicable
codes that apply to non-residential installations.
5.2 Gas Service Requirements
5.2.1 Gas Type
The type of gas appearing on the nameplate must be
the type of gas used. Installation must comply with
local codes and recommendations 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 Installa-
tion Code CSA B149.1 - latest revision.
5.2.2 Gas Supply Lines
The size of the gas supply lines must comply with
local codes and recommendations 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 Installa-
tion Code CSA B149.1 - latest revision.
A 1/8" NPT plugged tap must be installed in the gas
line connection immediately upstream of the burner
that is farthest from the gas supply meter. The tap is
required for checking system gas pressure.
5.2.3 Meter and Service
Meter and service must be large enough to handle all
the heaters being installed plus any other connected
load. The gas line which feeds the system must be
large enough to supply the required gas with a maxi-
mum pressure drop of 1/2" wc. When gas piping is
not included in the layout drawing, the local gas sup-
plier will usually help in planning the gas piping.
5.3 Electrical Service Requirements
The CGTH-Series heater requires a grounded three-
prong electrical outlet to be installed within 18" of the
rear surface of the heater’s burner box. It is recom-
mended that the outlet for the heater be ceiling-
mounted and should be on a dedicated circuit. DO
NOT use an electrical extension cord to operate the
heater.
Heater Rating: 120 VAC, 60 hz, 1 Ø, 1 A
5.3.1 Grounding
The heater must be electrically grounded in accor-
dance with the following codes: United States: Refer
to National Electrical Code®, NFPA 70 - latest revi-
WARNING
Explosion Hazard
Tighten gas hose fittings to connect gas
supply according to Figure 36.
Leak test all components of gas piping
before operation.
Gas can leak if piping is not installed
properly.
Do not high pressure test gas piping with
heater connected.
Failure to follow these instructions can result
in death, injury or property damage.
DANGER
Electrical Shock Hazard
Plug heater into grounded three-prong ceiling
receptacle.
Do not cut or remove the grounding prong
from this plug.
Do not use with an extension cord.
Failure to follow these instructions can result
in death or electrical shock.

SECTION 5: HEATER INSTALLATION REQUIREMENTS
9 of 29
sion. 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.
5.3.2 Thermostat
It is important to note that the CGTH-Series heater is
controlled by a lowvoltage (24V AC) thermostat sup-
plied with the heater. The control transformer located
inside the burner supplies the necessary electrical
power to operate the thermostat. No other electrical
power to the thermostat is required.
5.4 VentingRequirements
The CGTH-Series heater must be installed with the
venting system supplied or with the optional venting
kit available from Roberts-Gordon LLC. DO NOT
connect this heater to a separate chimney and do not
common vent with any other fuel burning appliance.
The CGTH-Series heater employs a balanced flue/air
venting duct system and must conform to the follow-
ing length requirements:
Maximum Length: 10' (3 m)
Minimum Length: 2.5' (.7 m)
Maximum Elbows:Two with natural gas units,
one with propane gas units
5.4.1 VentingCodes
The location, size, installation and termination of
vents, as well as the required safe distances from
combustibles when penetrating combustible walls,
must comply with local codes and recommendations
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.
5.4.2 Balanced Flue Construction
The balanced flue consists of a 3" (8 m) diameter flue
which is concentrically positioned inside a 5" (13 cm)
diameter vent pipe (See Figure 4). The 5" (13 cm)
diameter vent supplies outside air for combustion
while the 3" (8 cm) diameter flue carries the products
of combustion from the heater.
The balanced flue is applicable for both horizontal
and vertical venting arrangements. Vertical venting
will require the optional roof venting kit available from
Roberts-Gordon LLC.
FIGURE 4: Balanced Flue
5.5 Non-Residential Installations
5.5.1 Aircraft Hangars
The CGTH-Series heater may be used in certain
areas of aircraft hangars. Installation in aircraft han-
gars 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 - lat-
est revision.
• Heaters in aircraft storage or service areas must
be installed a minimum of 10' (3 m) above the
WARNING
Carbon Monoxide Hazard
Heaters must be exhausted outside.
Use materials supplied.
This heater needs fresh air for safe operation
and must be installed so there are provisions
for adequate combustion and ventilation air.
Failure to follow these instructions can result
in death or injury.
WARNING
Cut/Pinch Hazard
Wear protective gear during installation,
operation and service.
Edges are sharp.
Failure to follow these instructions can result
in injury.
Exterior Wall
Outside Air
Outside Air
ExhaustExhaust

CGTH USE AND CARE MANUAL
10 of 29
upper surface of wings or engine enclosures of
the highest aircraft which may be housed in the
hangar. (This should be measured from the bot-
tom of the heater to the top of the wing, or engine
enclosure, whichever is highest from the floor).
• In other sections of aircraft hangars, such as
shops or offices, heaters must be installed a mini-
mum of 8' (2.4 m) above the floor.
• Heaters installed in aircraft hangars shall be
located so as not to be subject to damage by air-
craft, cranes, movable scaffolding or other
objects.
• When installed over hoists, the required safe dis-
tances from combustibles must be maintained
from the uppermost point of the combustible
materials placed on the hoist.
5.5.2 Public Garages
The CGTH-Series heater may be used in public
garages. Installation in public garages must be in
accordance with the following codes: United States:
Refer to Standard for Parking Structures NFPA 88A - lat-
est revision or the Code for Motor Fuel Dispensing Facil-
ities and Repair Garages, NFPA 30A - latest revision.
Canada: Refer to Natural Gas and Propane Installation
Code CSA B149.1 - latest revision.
• Heaters must be installed a minimum of 8' (2.4 m)
above the floor. Required safe distances to com-
bustibles must be maintained from vehicles
parked belowthe heater.
• When installed over hoists, the required safe dis-
tances from combustibles must be maintained
from the uppermost point of the combustible
materials placed on the hoist.
5.5.3 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).
5.5.4 Hazardous Locations
Where there is the possibility of exposure to combus-
tible airborne material or vapor, consult the local fire
marshal, the fire insurance carrier or other authorities
for approval of the proposed installation.

SECTION 6: REQUIRED SAFE DISTANCES FROM COMBUSTIBLES
11 of 29
SECTION 6: REQUIRED SAFE DISTANCES FROM
COMBUSTIBLES
In all situations, the minimum required safe distances
from combustibles must be maintained. Combusti-
bles are materials which may catch fire and include
many common items such as wood, paper, rubber,
fabrics, etc. Combustible materials such as those
noted, and any other combustible materials, must not
be placed closer to any base or side of the CGTH-
Series heater than the distances noted in the dia-
grams on the following page. If youhave any ques-
tions about the required safe distances from
combustibles, or the associated diagrams, please
contact your installer, ROBERTS GORDON®inde-
pendent distributor, or Roberts-Gordon LLC at
+1.716.852.4400 or 1.800.828.7450, during normal
business hours which are Monday through Friday,
8:15 a.m. to 4:45 p.m., Eastern Time.
For owner safety, a thermostat tag is supplied with
the CGTH-Series as a permanent reminder of the
importance of maintaining the required safe dis-
tances from combustibles. Instructions for installing
the tag are located on Page 7, Section 4.4. Immedi-
ately contact your ROBERTS GORDON®indepen-
dent distributor or Roberts-Gordon LLC if the tag is
missing. See Page 15, Figure 8 for allowable vent
terminal locations.
It is important to keep the minimum required safe dis-
tances from combustibles at all times. Clearances
from vehicles parked beneath heaters must be main-
tained. The thermostat tag (included with the heater)
must be posted to identify any possible violation of
the minimum required safe distances from combusti-
bles from the heater in vehicle areas. Maximum
allowable stacking height in storage areas should be
identified with signs or appropriate markings. See
Page 13, Figure 6 and Figure 7 for the minimum
required safe distances from combustibles.
Due to high temperature, ensure that the heater
area is kept clear of furniture, draperies, clothing
or other combustible materials. Children and
adults should be alerted to the hazards of high
surface temperatures and should stay away to
avoid burns and clothingignition. Youngchildren
should be carefully supervised when they are in
the same room as the heater.
The warnings on this page appear on the heater and
are also on the thermostat tag to serve as a constant
reminder to maintain the required safe distances from
combustibles at all times. If youdo not have either the
label on your heater or the thermostat tag, immedi-
ately call your installer or Roberts-Gordon LLC for
replacement.
WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapors the minimum required safe distances
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
Burn Hazard
Keep all persons, especially children, away
from heater.
Do not touch any part of the heater.
Heater is very hot.
Failure to follow these instructions can result
in death, injury or property damage.

CGTH USE AND CARE MANUAL
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FIGURE 5: Thermostat Tag

SECTION 6: REQUIRED SAFE DISTANCES FROM COMBUSTIBLES
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Yo ur heater may be installed in one of three ways: horizontal, 45° tilt left or 45° tilt right. Since the distances
for the tilt installation are the same, the chart only shows one (the 45° tilt left). To determine the minimum
required safe distances for your heater, youmust knowthe mounting type and model number of your heater.
FIGURE 6: Horizontal Installations
FIGURE 7: 45° Tilted Installations
*All dimensions are from the reflector.
NOTE: All dimensions indicate the minimum required safe distances from combustibles. Dimensions "C" and
"E" DO NOT indicate the required mounting height. The minimum mounting height is 7' (2.1 m), except for
aircraft hangars and public garages. See Page 9, Sections 5.5.1 and 5.5.2.
Flue clearances from combustibles are zero. It is not necessary to provide additional clearance on
penetrations through the wall or roof.
Knowyour model number. Model number is found on the rating plate label. See Page 5, Figure 2.
F
B
A
C
24" Min. (60 cm)
B
Rating Tag
AA
DD
EE
AA
FF
Approx. 45°
24" Min. (60 cm)
Required safe distances from combustibles*
Inches Metric (cm)
Model A B C D E F A B C D E F
CGTH-30 416 36 28 34 611 41 92 72 87 16
CGTH-40 4 18 48 30 34 6 11 46 122 77 87 16
CGTH-50 420 48 32 36 611 51 122 82 92 16

CGTH USE AND CARE MANUAL
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SECTION 7: INSTALLATION
7.1 Choose Location for Heater
When selecting a suitable mounting location for the
CGTH-Series heater it is important to consider the
following:
• The heater must meet the minimum mounting
height requirement of 7' (2.1 m) above the floor.
For aircraft hangars and public garages, the
heater must meet the minimum mounting height
requirement of 8' (2.4 m) above the floor.
• The proposed mounting location allows for the
minimum required safe distances from combusti-
bles such as vehicles, wood, gasoline and flam-
mable objects, liquids and vapors.
• The proposed location of the heater will not
restrict motion of passageway doors or windows.
• The proposed location will not interfere with oper-
ation of the overhead garage door or allowthe
door to enter the minimum required safe dis-
tances from combustibles.
• The proposed location will provide the best cover-
age of the total area to be heated.
• Consideration be given to the types of vehicles
that will be parked in the garage (cars, vans,
boats, RV's, etc.).
• The proposed location will allowfor the required
safe distances from combustibles with respect to
the vehicles parked in the garage.
• The proposed location will allowthe required utili-
ties (i.e.: gas and electric) and venting to be
installed (maximum vent length is 10' (3 m).
• Sufficient clearances will exist to allowfor easy
access to the service door.
• Overhead structural members (rafters, beams,
etc.) are accessible for attaching the heater.
• To ensure the heater is placed in a approved
application.
7.2 General VentingGuidelines
Regardless of the venting arrangement that will be
connected to the heater, the following general guide-
lines for venting must be followed:
1. See Page 15, Figure 8 for allowable vent
terminal locations.
WARNING
Fire Hazard
Keep all flammable objects, liquids and
vapors the minimum required safe distances
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
Burn Hazard
Keep all persons, especially children, away
from heater.
Do not touch any part of the heater.
Heater is very hot.
Failure to follow these instructions can result
in death, injury or property damage.
WARNING
Carbon Monoxide Hazard
Heaters must be exhausted outside.
Use materials supplied.
This heater needs fresh air for safe operation
and must be installed so there are provisions
for adequate combustion and ventilation air.
Failure to follow these instructions can result
in death or injury.