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.
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 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.
®
Vantage
II
Gas-Fired, Low Intensity
Unitary Heater
Installation, Operation &
Service Manual
CTH2-40
CTH2-60
CTH2-80
CTH2-100
CTH2-125
CTH2-150
CTH2-175
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.
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.
Yo ur 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, includ-
ing the aluminum reflector portion of the heater and
the various venting components, ha
ve sharp edges.
To p r e vent 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.
SECTION 1: HEATER S AFETY
1.1 Manpower Requirements
To p r e
vent 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, corrosive chemicals or other elements. To order additional
labels, please contact Roberts-Gordon LLC or your
®
ROBERTS GORDON
independent distributor.
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
CTH2-SERIES INSTALLATION, OPERATIONAND SERVICE MANUAL
Logo Label
Rating Plate Label
Bottom
Panel
Top Panel
Gas Connection Label
Proposition 65 Label
DescriptionPart Number
Logo Label91013200
Rating Plate Label91010401
Gas Connection Label91018122
Proposition 65 Label91070015
FIGURE 1: Top and Bottom Panel Label Placement
2
FIGURE 2: Side and Back Panel Label Placement
DescriptionPart Number
Clearances to Combustibles Label91013415
Wiring Label91013300
Low Voltage Connection Label91039700
Vent Length Label91039500
Lighting Instruction Plate Label91029602
Lighting Instruction Plate Label
Thermostat
Connection
Label
Vent Length Label
Back Panel
Control Side Panel
SECTION 1: HEATER S AFETY
Clearances to Combustibles Label
Control Side Panel (Inside)Wiring Label
3
CTH2-SERIES INSTALLATION, OPERATIONAND SERVICE MANUAL
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 sus-
pend anything from heater.
•To ensure there is adequate air circulation around
the heater and to supply air for combu
stion, 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.
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 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
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.
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.
4
SECTION 3: CLEARANCES TO COMBUSTIBLES
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.
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 5, Figure 3 through Page 8, Figure 12 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 (50°C) above room
temperature. Building materials with a low heat tol-
erance (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
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.
SECTION 3: CLEARANCESTO COMBUSTIBLES
• 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 sus-
pension requirements
• 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.
on Page 14, Figure 14
.
FIGURE 3: STANDARD REFLECTOR
Model ABCDABCD
CTH2-406275327166913569
CTH2-606356335168916189
CTH2-806386638169716897
CTH2-100640714016102181102
CTH2-125646774616117196117
CTH2-150650805016127204127
CTH2-175852825221133209133
(inches)(centimeters)
5
CTH2-SERIES INSTALLATION, OPERATIONAND SERVICE MANUAL
A
C
D
B
A
C
D
B
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 4: ONE SIDE REFLECTOR
Model ABCDABCD
CTH2-406953441623135112
CTH2-606963471623161120
CTH2-806970541623178138
CTH2-1006977591623196150
CTH2-1256983651623211166
CTH2-1506986691623219176
CTH2-1758988732123224186
FIGURE 5: TWO SIDE REFLECTORS
Model ABCDABCD
CTH2-406155315163913539
CTH2-606236623165916859
CTH2-806257225166418364
CTH2-1006277827166919969
CTH2-1256328432168221482
CTH2-1506358835168922489
CTH2-175840914021102232102
(inches)(centimeters)
(inches)(centimeters)
FIGURE 6: 45° TILT REFLECTOR
(inches)(centimeters)
Model ABCDABCD
CTH2-408851462121130117
CTH2-608860542121153138
CTH2-808866602121168153
CTH2-10010874642621188163
CTH2-12510878692621199176
CTH2-15012884743121214188
CTH2-17512885793121216201
6
NOTE: 1. All dimensions are from the surfaces of all tubes, couplings and elbows.
A
C
D
B
B
C
D
A
A
C
D
B
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 7: U-TUBE, STANDARD REFLECTOR
Model ABCDABCD
CTH2-40
CTH2-606356330168916177
CTH2-806386937169717694
CTH2-100640763916102194100
CTH2-125646794316117201110
CTH2-150650844716127214120
CTH2-175854875121138221130
FIGURE 8: U-TUBE, 45°
Model ABCDABCD
SECTION 3: CLEARANCESTO COMBUSTIBLES
(inches)(centimeters)
- UNAPPROVED -
- UNAPPROVED -
(inches)(centimeters)
CTH2-40
- UNAPPROVED -- UNAPPROVED -
CTH2-608860422121153107
CTH2-808866462121168117
CTH2-1008874522121188133
CTH2-1258878612121199155
CTH2-1508884662121214168
CTH2-1758885702121216178
FIGURE 9: U-TUBE, OPPOSITE 45° REFLECTOR
(inches)(centimeters)
Model ABCDABCD
CTH2-40
CTH2-6085460222113815356
CTH2-8086066222115316856
CTH2-100106474222616318856
CTH2-125107078222617819956
CTH2-150127484223118821456
CTH2-175127685223119421656
- UNAPPROVED -- UNAPPROVED -
7
CTH2-SERIES INSTALLATION, OPERATIONAND SERVICE MANUAL
A
C
D
B
A
C
D
B
Radiant Tubes
Vent
Pipes
Unvented
Vented
A
E
F
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 10: 2-FOOT DECO GRILLE AND PROTECTIVE GRILLE
(inches)(centimeters)
Model ABCDABCD
CTH2-406275327166913569
CTH2-606356335168916189
CTH2-806386638169716897
CTH2-100640714016102181102
CTH2-125646774616117196117
CTH2-150650805016127204127
CTH2-175852825221133209133
FIGURE 11: LOWER CLEARANCE SHIELD*
(inches)(centimeters)
Model ABCDABCD
CTH2-40634273416876987
CTH2-6063933391610084100
CTH2-8064038401610297102
CTH2-100650445016127112127
CTH2-125654485416138122138
CTH2-150655505516140127140
*When installed in the first 10' (3 m).
FIGURE 12: VENTING
CTH2-175
- UNAPPROVED -- UNAPPROVED -
(inches)(centimeters)
ModelAEFAEF
CTH2-40141818364646
CTH2-60141818364646
CTH2-80202418516146
CTH2-100202418516146
CTH2-125202418516146
CTH2-150203018517746
CTH2-175203018517746
8
SECTION 4: NATIONAL STANDARDS AND
APPLICABLE CODES
SECTION 4: NATIONAL STANDARDSAND APPLICABLE C ODES
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 (whichever is
higher from the floor) to the bottom of the heater.
• In shops, offices and other sections of aircraft
hangars communicating with aircraft storage or
servicing areas, heaters shall be installed not
less than 8' (2.4 m) above the floor.
• Suspended or elevated heaters shall be so
located in all spaces of aircraft hangars that they
shall not be subject to injury by aircraft, cranes,
movable scaffolding or other objects. Provisions
shall be made to assure accessibility to
suspended heaters for recurrent maintenance
purposes.
4.3 Public Garages
Installation in garages must be in accordance
with the following codes:
United States: Refer to Standard for Parking
Structures NFPA 88A - latest revision or the
Code for Motor Fuel Dispensing Facilities and
Repair Garages, NFPA 30A - latest revision.
Canada: Refer to Natural Gas and Propane
Installation Code CSA B149.1 - latest revision.
• Heaters must not be installed less than 8'
(2.4 m) above the floor. Minimum clearances to
combustibles must be maintained from vehicles
parked below the heater.
• When installed over hoists, minimum
clearances to combustibles must be maintained
from the upper most point of objects on the hoist.
4.4 Electrical
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).
9
CTH2-SERIES INSTALLATION, OPERATIONAND SERVICE MANUAL
Burner with Tube Gasket
Must be installed with the
flame observation window facing down.
Reflector
(Aluminum or
Stainless
Steel)
Alternate overlap as
shown on overview and on Page 16, 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.
Burner Tube
Supplied in 10
'
(3 m) lengths. Burner
tube is always the first tube
after the burner.
Reflector Support Strap &
Wire Form
Turbulator
Turbulator must
be installed in the last
standard section of tube.
Turbulator is not required on the
CTH2-125/150/175. For
installation see Page 20, Section 6.4.
Vent Adapter
SECTION 5: MAJOR COMPONENTS
FIGURE 13: Major Component Descriptions
10
SECTION 5: MAJOR COMPONENTS
5.1 Standard Parts List
Table 1: Contents of the Burner Carton
Part No.DescriptionCTH2-40 CTH2-60 CTH2-80 CTH2-100 CTH2-125 CTH2-150 CTH2-175
030XXXXX Burner Assembly (Rate and Fuel Varies)1111111
02568200 Gasket (Burner to Burner Tube)1111111
130100NA Installation, Operation and Service Manual1111111
Additional tubing length may be added to heater. Tubing must be heat-treated, aluminized or porcelain
coated. Any additional tubing lengths are considered as vent length for length determination. Maximum venting length for minimum heater length is 45' (13.7 m) total.
12
SECTION 6: HEATER I NSTALLATION
WARNING
Severe Injury Hazard
Secure burner to burner tube with bolts 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.
SECTION 6: HEATER INSTALLATION
Typical installation configurations are shown in
Figure 14.
Expansion and contraction of the tube dictates that
the minimum suspension lengths in the table on Page 14, Figure 14 be maintained.
To ensure your safety, and comply with the terms of
the warranty, all units must be installed in accordance with these instructions.
The gas or the electrical supply lines must not be
used to support the heater.
Do not locate the gas or electric supply lines directly
over the path of the flue products from the heater.
The heater must be installed in a location that 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.
13
CTH2-SERIES INSTALLATION, OPERATIONAND SERVICE MANUAL