Roberts Gorden CTH2-80 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 serviceman with necessary information.
®
Vantage
II
Gas-Fired, Low Intensity
Unitary Heater
Installation, Operation &
Service Manual
CTH2-40
CTH2-60
CTH2-80
CTH2-100
CTH2-125
Quality in Any Language™
© 2008 Roberts-Gordon LLC
Roberts-Gordon LLC
1250 William Street
P.O . B o x 44
Buffalo, New York 14240-0044
Telephone: 716.852.4400
Fax: 716.852.0854
Toll Free: 800.828.7450
www.rg-inc.com
www.radiantheaters.com
CTH2-150
CTH2-175
P/N 130100NA Rev. K 11/08
© 2008
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
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 .................................................... 10
SECTION 6: Heater Installation............................................12
6.1 Burner Tube Installation ............................................ 17
6.2 Tube Clamp Package Installation..............................17
6.3 Coupling and Tube Assembly....................................18
6.4 Turbulator Installation ................................................ 19
6.5 Reflector Installation .................................................. 20
6.6 Burner Installation......................................................22
SECTION 7: Optional Heater Accessories..........................23
7.1 U-Tube Configuration..................................................23
7.2 Elbow Package Configuration.....................................26
7.3 Reflector Side Extension ............................................ 28
7.4 Lower Clearance Shield Installation ...........................29
7.5 Two-Foot Decorative Grille Installation ....................... 29
7.6 Protective Grille Installation ........................................ 31
SECTION 8: Venting..............................................................32
8.1 General Venting Requirements..................................32
8.2 Unvented Operation................................................... 32
8.3 Horizontal Venting......................................................32
8.4 Vertical Venting.......................................................... 32
8.5 Unvented Operation Tube Termination ...................... 33
8.6 Length Requirements ................................................33
8.7 Horizontal Ventilation 4" (10 cm) Pipe........................33
8.8 Vertical Ventilation 4" (10 cm) Pipe............................33
8.9 Common Sidewall Venting.........................................34
8.10 Common Vertical Venting ........................................35
8.11 Outside Combustion Air Supply ............................... 36
SECTION 9: Gas Piping........................................................38
SECTION 10: Wiring.............................................................. 40
10.1 Line Voltage Thermostat Wiring............................... 40
10.2 Low Voltage Thermostat with One Burner ............... 40
10.3 Low Voltage Thermostat Wiring with Multiple
Burners.................................................................... 41
10.4 Internal Wiring ......................................................... 41
10.5 Ladder Diagram....................................................... 42
10.6 Electrical Connection to the Burner ......................... 42
SECTION 11: Operation and Maintenance.......................... 43
11.1 Sequence of Operation ............................................ 43
11.2 To Shut Off Heater.................................................... 43
11.3 To Start Heater ......................................................... 43
11.4 Pre-Season Maintenance and Annual Inspection..... 43
11.5 Maintenance Checklist ............................................. 44
SECTION 12: Troubleshooting............................................. 46
12.1 Honeywell SmartValve
12.2 Troubleshooting Flow Chart ..................................... 47
12.3 Manifold Gas Pressure Setting ................................ 49
SECTION 13: Replacement Parts ........................................ 50
SECTION 14: General Specifications.................................. 52
14.1 Material Specifications............................................. 52
14.2 Heater Specifications............................................... 52
14.3 Suspension Specifications....................................... 52
14.4 Controls Specifications ............................................ 52
SECTION 15: The ROBERTS GORDON
Warranty......................................................... 53
®
II Troubleshooting .............. 46
®
VANTAGE® II
Printed in U.S.A.
TABLE OF FIGURES
Figure 1: Top and Bottom Panel Label Placement....................1
Figure 2: Side and Back Panel Label Placement......................2
Figure 3: Standard Reflector ..................................................... 4
Figure 4: One Side Reflector.....................................................5
Figure 5: Two Side Reflectors ...................................................5
Figure 6: 45° Tilt Reflector ........................................................ 5
Figure 7: U-Tube, Standard Reflector........................................6
Figure 8: U-Tube, 45°................................................................6
Figure 9: U-Tube, Opposite 45° Reflector .................................6
Figure 10: 2-Foot Deco Grille, 1-Foot Deco Grille and
Protective Grille........................................................ 7
Figure 11: Lower Clearance Shield...........................................7
Figure 12: Venting .....................................................................7
Figure 13: Major Component Descriptions................................ 9
Figure 14: Critical Hanger Placement..................................... 13
Figure 15: Linear Heater Assembly Overview ........................ 14
Figure 16: Linear Heater Layout Overview.............................. 15
Figure 17: Linear Heater Layout Overview (Continued).......... 16
Figure 18: U-Tube Heater Assembly Overview ...................... 23
Figure 19: U-Tube Heater Layout Overview ............................24
Figure 20: U-Tube Heater Layout Overview (Continued) ........25
Figure 21: Reflector Joint Detail ..............................................27
Figure 22: Tube Termination ...................................................33
Figure 23: Gas Connection with Flexible Gas Hose ............... 39
LIST OF TABLES
Table 1: Contents of the Burner Carton..................................10
Table 2: Contents of Core and Extension Packages.............. 10
Table 3: Component Package Guide......................................11
SECTION 1: HEATER S AFETY
Logo Label
Rating Plate Label
Bottom
Panel
Top Panel
Gas Connection Label
Description Part Number
Logo Label 91013200
Rating Plate Label 91010401
Gas Connection Label 91018122
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.
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. Thin sheet metal parts,
FIGURE 1: Top and Bottom Panel Label Placement
including the aluminum reflector portion of the heater
and the various venting components, 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 adjustment of the appliance are compatible.
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 are legible.
Please contact Roberts-Gordon or your ROBERTS
GORDON
®
independent distributor to obtain
replacement signs or labels. See Page 1, Figure 1
through Page 2, Figure 2.
1
CTH2-SERIES INSTALLATION, OPERAT ION AND SERVICE MANUAL
Clearances to Combustibles Label
Control Side Panel
Control Side Panel (Inside) Wiring Label
Description Part Number
Clearances to Combustibles Label 91013415
Wiring Label 91013300
Thermostat Connection Label 91037902
Vent Length Label 91039500
Lighting Instruction Plate Label 91029602
Lighting Instruction Plate Label
Thermostat
Connection
Label
Vent Length Label
Back Panel
FIGURE 2: Side and Back Panel Label Placement
2
SECTION 2: INSTALLER R ESPONSIBILITY
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 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 installation, operation and service manual.
• To never use heater as 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 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 combustibles. 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, you may
affix this copy on the wall near the heater.
on the burner and in the Installation, Operation and
Service Manual. See Page 4, Figure 3 through Page
7, 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
CAUTION:
Do not use heater in an area containing corrosive
chemicals. Avoid the use of corrosive chemicals to
ensure a longer life of the burner, tubing and other
parts.
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 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.
Know your model number and installed configuration.
Model number and installed configuration are found
3
CTH2-SERIES INSTALLATION, OPERAT ION AND SERVICE MANUAL
WARNING
Fire Hazard
Some objects can catch fire or explode
when placed close to heater.
Keep all flammable objects, liquids and
vapors the required clearances to
combustibles away from heater.
Failure to follow these instructions can
result in death, injury or property damage.
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 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 3 through
Page 7, Figure 12 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, triply, 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 material,
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.
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.
• 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 13, Figure 14
.
• 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.
FIGURE 3: STANDARD REFLECTOR
Model A B C D A B C D
CTH2-40 6 27 53 27 16 69 135 69
CTH2-60 6 35 63 35 16 89 161 89
4
CTH2-80 6 38 66 38 16 97 168 97
CTH2-100 6 40 71 40 16 102 181 102
CTH2-125 6 46 77 46 16 117 196 117
CTH2-150 6 50 80 50 16 127 204 127
CTH2-175 8 52 82 52 21 133 209 133
(inches) (centimeters)
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