Cambridge Engineering ITH Series User manual

ITH-SERIES
GAS-FIRED
INFRARED TUBE HEATERS
TECHNICAL MANUAL
ITH-TM-0412
mWARNING:
Improper installation, adjustment, alteration, service or maintenance can cause property dam-
age, injury or death. Read the installation, operating, and maintenance instructions thoroughly
before installing or servicing this equipment.
FOR YOUR SAFETY
The use and storage of gasoline or other flammable vapors and liquids in open containers in
the vicinity of this appliance is hazardous.
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. Don’t touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
®
INSTALLER
Read and thoroughly understand these instructions
before attempting any installation.
OWNER
Retain this manual for reference.

CAUTION: FIRE OR EXPLOSION HAZARD
Maintain clearance to combustible constructions as further specified in this manual. Failure
to do so could result in a serious fire hazard. Heaters should not be located in hazardous
atmospheres containing flammable vapors or combustible dusts. Signs should be provided in
storage areas specifying maximum safe stacking height.
CAUTION: MECHANICAL HAZARD
This equipment expands and contracts with each operating cycle. The gas connection,
suspension hardware and the installation itself must safely allow this movement. Failure to
do so could result in serious fire or explosion hazard.
CAUTION: FIRE OR EXPLOSION HAZARD
This heater is equipped with an automatic ignition device. Do not attempt to light the burner
by hand. Failure to comply could result in a serious fire and personal injury hazard.
CAUTION: MECHANICAL HAZARD
Do not use high pressure (above 14.0” W.C.) to test the gas supply system with the burner
connected. Failure to do so could result in damage to the burner and its control components,
requiring replacement.
CAUTION: SERVICE LIFE RISK
Do not install equipment in atmospheres containing halogenated hydrocarbons or other
corrosive chemicals. Failure to do so may lead to premature equipment failure and
invalidation of the warranty. Additionally, it is recommended that the equipment be installed
with a slope downward and away from the burner of ¼" in 10' to allow start-up condensate
drainage.

ITH-Series Technical Manual Page 3 Cambridge Engineering Inc.
Table of Contents
INTRODUCTION..................................................................................................................................................................4
INSTALLATIONCODES......................................................................................................................................................................4
GeneralInstallationandGasCodes......................................................................................................................................4
AircraftHangarInstallation..................................................................................................................................................4
PublicGarageInstallation.....................................................................................................................................................4
ParkingStructures.................................................................................................................................................................4
GasSupplyLines...................................................................................................................................................................5
Electrical...............................................................................................................................................................................5
Venting.................................................................................................................................................................................5
GENERALSPECIFICATIONS..................................................................................................................................................6
GASSUPPLY..................................................................................................................................................................................6
InletPressure........................................................................................................................................................................6
ManifoldPressure.................................................................................................................................................................6
InletConnection....................................................................................................................................................................6
ELECTRICSUPPLY............................................................................................................................................................................6
FLUEANDOUTSIDEAIRCONNECTION................................................................................................................................................6
DIMENSIONALCHARTS.......................................................................................................................................................7
CONFIGURATIONS..............................................................................................................................................................8
CLEARANCETOCOMBUSTIBLES..........................................................................................................................................9
INSTALLATION..................................................................................................................................................................11
INSTALLATIONSEQUENCE...............................................................................................................................................................11
VENTING/COMBUSTIONAIRDUCTING.............................................................................................................................25
GENERALREQUIREMENTS..............................................................................................................................................................25
UNVENTEDOPERATION.................................................................................................................................................................25
VENTEDOPERATION.....................................................................................................................................................................26
HorizontalVenting..............................................................................................................................................................26
VerticalVenting..................................................................................................................................................................26
CommonVerticalVenting...................................................................................................................................................26
CommonHorizontalVenting...............................................................................................................................................27
COMBUSTIONAIRSUPPLY(OPTIONAL).............................................................................................................................................28
GASPIPING.......................................................................................................................................................................29
GENERALREQUIREMENTS..............................................................................................................................................................29
ELECTRICALWIRING..........................................................................................................................................................30
GENERALREQUIREMENTS..............................................................................................................................................................30
BURNEROPERATION.........................................................................................................................................................31
STARTINGSEQUENCEOFOPERATION...............................................................................................................................................31
MAINTENANCE............................................................................................................................................................................31
TROUBLESHOOTING..........................................................................................................................................................32
BLOWERMOTORFAILSTORUN......................................................................................................................................................32
NOGASSUPPLY...........................................................................................................................................................................32
BURNERDOESNOTLIGHT..............................................................................................................................................................32
BURNERDOESNOTSTAYLIT..........................................................................................................................................................32
TROUBLESHOOTINGCHART............................................................................................................................................................33
REPLACEMENTPARTS.......................................................................................................................................................34
WARRANTY.......................................................................................................................................................................35

ITH-Series Technical Manual Page 4 Cambridge Engineering Inc.
Important
These instructions, the layout drawing, local codes and ordinances, and applicable standards such as
apply to gas piping and electrical wiring comprise the basic information needed to complete the
installation, and must be thoroughly understood along with general building codes before proceeding.
Only personnel who have been trained and understand all applicable codes should undertake the
installation.
Introduction
Established in 1963, Cambridge Engineering, Inc. is a manufacturing company with strong R&D,
engineering and customer oriented problem solving capabilities.
High quality, energy efficient Genuine Cambridge heaters reduce operating costs and are engineered to
provide trouble-free service for years to come. Cambridge heaters are supported by factory-trained
sales/service representatives.
Cambridge ITH-Series, Infrared Tube Heaters are low intensity, high performance gas-fired radiant
heaters. This field assembled unitary space heater design includes a premium, high efficiency reflector
for additional energy savings in a wide variety of commercial and industrial applications.
Installation Codes
Installations must comply with local building codes, or in their absence, the latest edition of the national
regulations and procedures as listed below.
General Installation and Gas Codes
Heaters must be installed only for use with the type of gas appearing on the rating plate, and the
installation must conform to the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
This heater is approved for indoor installation. Not for use in residential dwellings, refer to Rating plate.
Aircraft Hangar Installation
Installation in aircraft hangars must conform to the Standard for Aircraft Hangars, ANSI/NFPA 409.
Public Garage Installation
Installation in public garages must conform to the Standard for Parking Structures, NFPA-88A or
Standard for Repair Garages, NFPA 88B.
Parking Structures
Technical requirements are outlined in ANSI/NFPA 88B.

ITH-Series Technical Manual Page 5 Cambridge Engineering Inc.
Introduction
Gas Supply Lines
Gas supply pipe sizing must be in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
A 1/8" NPT plugged tap must be installed in the gas line connection immediately upstream of the burner
farthest from the gas supply meter to allow checking of system gas pressure.
Electrical
All heaters must be electrically grounded in accordance with the National Electric Code, ANSI/NFPA 70,
and must comply with all local requirements.
Venting
Refer to the National Fuel Gas Code, ANSI Z223.1/NFPA 54 for proper location, sizing and installation
of vents as well as information on clearance requirements when penetrating combustible walls for venting
purposes.

ITH-Series Technical Manual Page 6 Cambridge Engineering Inc.
General Specifications
General Specifications
Gas Supply
Inlet Pressure
Natural Gas: Minimum
Maximum
5.0" W.C.
14.0" W.C. Propane Gas: Minimum Maximum
11.5" W.C.
14.0" W.C.
Manifold Pressure
Natural Gas: 3.5" W.C. Propane Gas: 10.5" W.C.
Inlet Connection
Natural Gas or Propane: 1/2" female NPT
Electric Supply
120 VAC, 60 HZ, 1 Amp: 36" cord with grounded 3 prong plug
Flue and Outside Air Connection
4" O.D. male connection for flue adapter and outside air (optional) provided at the heater

ITH-Series Technical Manual Page 7 Cambridge Engineering Inc.
Dimensional Charts
Figure 1: Overall Dimensional Information
Figure 2: Component Dimensional Information
16"
TUBE
4', 6' OR 8'
REFLECTOR
BAFFLE SECTION
U-BEND
24"
18"
ELBOW
WHEN INSTALLING, ORIENT
BAND CLAMP LOCK BOLTS
TO TOP, AT 10 O'CLOCK
OR 2 O'CLOCK POSITION
COUPLING
12"
10' - 4"
10'
36"
12"
12"
16"
6"
10' - 4"
10'
24"
18"
7.5"
9.0"
14.0"
14"

ITH-Series Technical Manual Page 8 Cambridge Engineering Inc.
Configurations
Table 1: Configuration Information
Note:
-Baffles are always placed in the last section of radiant tube.
-Baffles are either aluminized or stainless steel sections 4', 6' or 8' long.
-When only 6' is required an aluminized steel baffle is installed, except on the ITH-40 where a
special 6' stainless steel baffle with a red identification tab must be installed.
-When 12' is required the aluminized steel baffle is lengthened forward (toward the burner) with a
6' stainless steel section.
Part numbers for reference are:
-CMCT016 Baffle for ITH-40 only, 6' long, stainless steel with red identification tab.
-CMCT007 Baffle 6' long, aluminized steel
-CMCT006 Baffle extension, 6' long stainless steel.
The following special configurations are also approved:
80,000 BTU/Hr 40' heat exchanger with NO baffle or 6' aluminized baffle.
100,000 BTU/Hr 40' or 50' heat exchanger with NO baffle or 6' aluminized baffle
125,000 BTU/Hr 40' or 50' heat exchanger with 6' aluminized baffle
150,000 BTU/Hr 60' heat exchanger with NO baffle
205,000 BTU/Hr 50' heat exchanger with a 4' baffle at 40', and a 8' baffle at 50' (See Figure 3)
Figure 3: Baffle Location ITH-205 Models
Model Rate
(BTU/Hr)
Heat Exchanger Length
(ft.) Baffle
Length (ft.) Baffle Kit P/N
Minimum Maximum
ITH-40 40,000 10 20 6 CMCT045
ITH-60 60,000 20 30 6 CMCT046
ITH-80 80,000 20 30 12 CMCT047
ITH-100 100,000 20 30 12 CMCT047
ITH-125 125,000 30 50 12 CMCT047
ITH-150 150,000 40 60 6 CMCT046
ITH-175 175,000 50 60
ITH-205 205,000 60 70
ITH-220 220,000 60 70
50'
Fold
Over
40'
3'-6"
PN CMCT026
7'-6"
PN CMCT027
Fold
Over
BAFFLE LOCATION FOR ALL 205,000 BTU/Hr, 50 ft. UNITS ONLY
(P/N CMCT095 Baffle Kit)

ITH-Series Technical Manual Page 9 Cambridge Engineering Inc.
Clearance To Combustibles
A general clearance of 18” in every direction is recommended for servicing only around each Burner
and End Vent Cap air supply (at the far end of each Radiant Branch) also to ensure adequate air flow in
and around the Heating System.
In addition to this it is very important to observe the minimum clearance to combustibles at all
times to avoid any possibility of property damage or personal injury.
WARNING
Clearances as marked on the heater body must be maintained from vehicles parked beneath. Signs
should be posted identifying any possible violation of the clearance distances from the heater in all
vehicle areas.
Maximum allowable stacking height in storage areas should be identified with signs or appropriate
markings adjacent to the thermostat or in a conspicuous location.
Table 2 lists the minimum clearance to combustible materials for various installation configurations. Note
that standard clearances also apply to installation above T-bar ceilings and above decorative grills.
Additional clearance may be required for glass, painted surfaces and other materials which may be
damaged by radiant or convective heat.
Combustible materials are considered to be wood, compressed paper, plant fibers, plastics, Plexiglas or
other materials capable of being ignited and burned. Such materials shall be considered combustible
even though flame-proofed, fire-retardant treated or plastered.
Elbows and U-bends are un-heat treated aluminized material and are typically installed without reflectors.
Reflector miter kits are available for U-bends and elbows.
Adequate clearance to sprinkler heads must be maintained.
The stated clearance to combustibles represents a surface temperature of 90°F above room temperature.
Building materials with low heat tolerance (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.
Note 1:
Bottom Shields are approved for all burner sizes. The “below” clearance (dimension C in Table 2)
may be reduced by 25% when an approved Bottom Shield is used.
Note 2:
Reduced clearances downstream from the burner are approved for all configurations. Dimensions “B”,
“C”, and “D” in Table 2 can be reduced for locations 25’ or more downstream from a burner. Before
the next burner, maximum reduction is 50%.

ITH-Series Technical Manual Page 10 Cambridge Engineering Inc.
Clearance to Combustibles
Table 2: Minimum Clearance to Combustibles
Model No.: ITH
Reflector Configurations Dim 40 60 80 100 125 150 175 205 220
Horizontal
A
CDB
A
B
C
D
2"
18"
45"
18"
2"
25"
58"
25"
2"
26"
62"
26"
2"
30"
67"
30"
4"
33"
71"
33"
4"
36"
74"
36"
6"
40"
78"
40"
6"
44"
80"
44"
6"
46"
83"
46"
45° Reflector Tilt
D
A
B
C
A
B
C
D
4"
4"
40"
38"
4"
4"
50"
46"
4"
4"
58"
50"
4"
4"
67"
58"
6"
4"
70"
63"
6"
4"
71"
64"
8"
4"
74"
67"
8"
4"
78"
72"
8"
4"
81"
77"
One Side Extension
D
A
C
B
A
B
C
D
2"
4"
50"
35"
2"
4"
58"
38"
2"
4"
63"
42"
2"
4"
73"
45"
4"
4"
76"
50"
4"
4"
78"
52"
6"
6"
80"
54"
6"
6"
84"
56"
6"
6"
84"
58"
Two Side Extension
D
A
BC
A
B
C
D
2"
9"
50"
9"
2"
16"
58"
16"
2"
18"
64"
18"
4"
18"
71"
18"
4"
22"
78"
22"
4"
24"
80"
25"
6"
26"
82"
26"
6"
29"
86"
29"
6"
31"
88"
31"
U-Tube, Horizontal
D
A
B
C
A
B
C
D
-
-
-
-
2"
25"
59"
22"
2"
28"
62"
26"
2"
30"
71"
30"
4"
34"
74"
33"
4"
37"
76"
36"
6"
40"
78"
40"
6"
45"
82"
44"
6"
46"
88"
46"
U-Tube, Opposite 45°
D
A
B
C
A
B
C
D
-
-
-
-
4"
46"
51"
16"
4"
50"
54"
18"
4"
54"
64"
18"
4"
63"
69"
22"
4"
64"
71"
24"
8"
67"
74"
26"
10"
72"
78"
29"
10"
74"
81"
32"
Unvented Above
End 12" 26" 12" 26" 18" 26" 18" 26" 18" 26" 18" 32" 18" 32" 18" 32" 18" 32"
Vented End 18" 18" 18" 18" 18" 18" 18" 18" 18"

ITH-Series Technical Manual Page 11 Cambridge Engineering Inc.
Installation
Installation Sequence
Generally, there is no unique sequence for installation of the burner or heat exchanger. A review of the
job site will usually indicate a logical installation order. However, time and expense can be saved if
installation is begun at the most critical dimension, watching for interference from overhead doors,
cranes, auto lifts, etc. Figure 4 provides a general overview of the components utilized in the installation,
as well as their general relationship.
Figure 4: General Overview of Installation
A general ordered sequence for installation is provided below for reference.
HANGERS INSTALLATION
Suspension mechanism must allow for lateral tubing expansion. A minimum 12" length welded
link chain with a working load limit of at least 200 lbs. is recommended. (Figure 5). Close all
open ended S hooks and turnbuckles to avoid unhooking chain with inadvertent contact.
Locate hanging chain at predetermined suspension points in the structure. It is required that the
first 2 hangers be about 8' to 9' apart. Thereafter, 10' apart on average is acceptable for the
remainder of the heat exchanger. At no time should hangers be more than 12' apart, (Figure 6).
Install Baffle As
Required In Last
Section Of Tube
Reflector Support
Gasket
Burner
Assembly
Combustion
Tube
Fasten Endcap
with Screws
Tight
Screws
Loose
Screws
Tight
Screws
Loose
Screws
Reflector Overlap
Approx. 6"
Reflector Overlap
Approx. 8"
Tube
Coupling
Tube & Reflector
Hangers
Vent
Adapter
Reflector
End Cap
Bend Tab Over
End Of Tube
Heat
Exchanger
Tube
2"-8"
Blower shown
with optional
Air Inlet Collar Kit
Install
"J" Bolt at
First Hanger
Tube
Flange

ITH-Series Technical Manual Page 12 Cambridge Engineering Inc.
Installation
Figure 5: Suspension Mechanism
Install the tube and reflector support hanger on the chain with “S-hooks” (Figure 5 & Figure 6).
Figure 6: Hanging Points
Place the first (flanged, aluminized) tube in the first two hangers (Figure 7). Be sure the flange is
toward the intended burner location. The other end of the tube should have the first coupling
already loosely fitted.
Concrete Beam
Turnbuckle
Beam Clamp
24"
Min.
3/8"
Threaded
Rod
I-Beam
I-Beam
12"
Min.
Anchor
"S" Hook
Note:
Close all "S" Hooks,
Turnbuckles, "J" Bolts. 12"
Min.
Truss
Eye Bolt
8' to 9'
10'
10'
Burner
Side
"First Hanger"
Venting
Side
"Last Hanger"
Close all open ended
"S" hooks and
turnbuckles

ITH-Series Technical Manual Page 13 Cambridge Engineering Inc.
Installation
TUBE INSTALLATION
Always use all the hangers supplied. As a rule the combustion tube (first tube) utilizes 2 hangers
and thereafter 1 hanger per 10' section. It is required that the first hanging point be 2"to 8"
from the burner mounting flange, and tube weld seam must face down, refer to Figure 7 for
more details.
Figure 7: Installation of First section of Flanged Tube
For all remaining tubes, fit the end of the tube with a coupling (Figure 8), (the coupling should be
loose).
Figure 8: Installation of Heat Exchanger Tube and Coupling
Tube
Coupling
(loosely fitted)
Heat
Exchanger
Tube
10'
Tube Weld
Seam Facing
Down
8' - 9'
Tube & Reflector
Hangers
Combustion
Tube
Coupling Should Be
Loosely Fitted
Locate Tube and
Reflector Hangers
every 10' thereafter.
10'
Tube
Flange
2"-8"
10'
Install "J" Bolt
at first hanger
Tube Weld
Seam Facing
Down

ITH-Series Technical Manual Page 14 Cambridge Engineering Inc.
Installation
Tighten the cradle loops of the first hanger with the “J-Bolt” found in the burner box, to snugly
hold the combustion tube from rotating (Figure 9).
Note: For all coupling joints, ensure that the tube joint is in the center of the coupling
length, and that the overlap joint of the coupling is above the centerline of the tube. Also
ensure that the weld seam on ALL tubes is facing down.
Note: In order to obtain smoothly sealed coupling liners, tighten each of the coupling
bands progressively and alternately. Tightening one band completely before the other may
result in an undesirable wrinkle in the liner (Figure 9). Be sure not to over torque the
coupling. (Torque coupling to 15-25 ft-lbs).
Figure 9: “J” Bolt and Coupling Installations
Continue placing tubes, couplings and reflectors to complete the heater assembly. Ensure heat
exchanger sections line up straight. Couplings should be tightened as heat exchanger is placed,
since it is more difficult to do so once the reflector is in position.
Installation of Reflector Hangers
and "J" Bolt
Place Tube in the
Reflector Hanger
as shown.
Reflector Hanger
Install "J" Bolt at the
First Hanger Only.
When Installing, Orient
Band Clamp Lock Bolts
to Top, at 10 o'clock
Or 2 o'clock Position to
Avoid Contact with the
Reflector.
Tube weld
seam
Tube
weld
seam
Installation of Tube Coupling
Torque to 15-25 ft.-lbs

ITH-Series Technical Manual Page 15 Cambridge Engineering Inc.
Installation
HEATER AND BAFFLE INSTALLATION
Locate the burner gasket provided, bolt the burner in place on the tube flange with provided
hardware. Burner must never be installed in a tilted position. The sense electrode of the burner
cup should be in the 12 o’clock position (Figure 10).
Figure 10: Burner Gasket Installation
If required for your heater model (refer to Table 1), install the baffle at the end of the heat
exchanger. The small tab on the baffle is folded over the end of the tube and clamped in place by
the vent connector and vent system, (Figure 11).
Note: Baffles are always placed at the end of the last heat exchanger tube length, with the
exception of the special configuration ITH-205 with a 50′tube length, (Figure 3) for more
details.
Note: Baffles are either one or two sections (each section is 6' in length). Multiple sections are
simply clipped together. Where stainless and aluminized sections are supplied, always
place the stainless steel section closest to the burner. The easiest installation method is to
pull the baffle through the tube using a long wire.
Figure 11: Baffle Installation
Note:
Burner MUST NEVER
be tilted sideways.
Burner
Assembly
Gasket
Tube
Flange
Blower shown
with optional
Air Inlet Collar Kit
Bend Tab
over End
of Tube
at 6 O'clock
position
Vent
Adapter Install Baffle
as required in
last section
of tube

ITH-Series Technical Manual Page 16 Cambridge Engineering Inc.
Installation
A general overall view of the tubes and reflector hangers are shown in Figure 12 below
Figure 12: Overall view of Tubes and Reflector Hangers
Tube & Reflector
Hangers
Install Baffle
as required in
last section
of tube
Heat
Exchanger
Tube
Tube
Coupling
Vent
Adapter
Bend Tab
over End
of Tube
Install "J" Bolt
at first hanger
Tube
Flange
Gasket
2"
to
8"
Combustion
Tube
Burner
Assembly
Tube
Coupling
10' Flanged
Tube
8' - 9'
Locate Tube and
Reflector Hangers
every 10' thereafter.
*Note: (30' system shown
here, the same principle
should be followed for 40', 50'
systems or more)
Refer to Installation Sequence
for more details.
10'
10'
Blower shown
with Optional
Air Inlet Collar Kit

ITH-Series Technical Manual Page 17 Cambridge Engineering Inc.
Installation
REFLECTOR INSTALLATION
Slide a reflector section into place within the support hanger. (Figure 13).
Figure 13: Reflector Installation
Install reflector support brackets, one at each reflector overlap position, and one in the middle of
each 10' reflector length. Figure 14 shows the installation of the reflector support bracket.
Figure 14: Reflector Support Bracket Installation
Slide Reflector through
the Hanger and Reflector
Support as shown.
1. Place Reflector Bracket
underneath the tube.
2. Hook the Spring Clip with
the Reflector Bracket and rotate
over the tube.
3. Push down the Spring Clip
and slide underneath the
Reflector Bracket. Reflector Bracket
Spring Clip
Reflector Bracket
Tube

ITH-Series Technical Manual Page 18 Cambridge Engineering Inc.
Installation
Note: Reflectors should overlap adjacent reflectors 4" to 6". Be sure not to tile reflector sections;
that is, reflector sections must be either above both adjacent reflector sections, or below both
adjacent reflector sections. (Figure 15).
Figure 15: Reflector Overlap Illustration
Reflector
Support
Loose
Screws
Tight
Screws
Loose
Screws Tight
Screws
Reflector Overlap
Approx. 6"
Fasten Endcap
with Screws

ITH-Series Technical Manual Page 19 Cambridge Engineering Inc.
Installation
Secure every second reflector overlap together with a minimum of 2 - #8 x 3/8" long screws (not
supplied), and secure reflector to the reflector bracket at this point by tightening down #8 x 1¼"
screws supplied with reflector brackets (Figure 16). The remaining reflector overlap joints and
reflector brackets are left loose to accommodate system movement.
Figure 16: Reflector Supports Installation and Reflector Overlap
Install End Cap as shown in Figure 4 and Figure 17.
Figure 17: Reflector End Cap Installation
Insert End Cap into Reflector
and Secure it with #8 x 3/8" Screws
Secure every SECOND reflector
overlap with a minimum of 2
#8 x 3/8" long screws
on each side
Secure reflector to reflector
bracket by tightening
#8 x 1 1/4" long screws every
other overlap on each side.

ITH-Series Technical Manual Page 20 Cambridge Engineering Inc.
Installation
ELBOW AND “U-TUBE”INSTALLATION
If required by the heater layout, install 90° elbows or U-tube where indicated. Refer to Figure 18
for details.
Note: Elbows or U-tubes are typically installed without reflectors. To reduce the above
clearance to combustibles distance use mitered reflectors (Figure 19) and refer to
Clearance to Combustibles information.
Figure 18: 90° Elbow and U-Tube Assembly Detail
Elbows or U Tubes must be located not less than 10' from the burner in ITH-100 and smaller
models, not less than 15' from the burner in ITH-125 to ITH-150, and not less than 20' from the
burner in ITH-175 and larger models.
Endcap
Elbow Detail
Couplings
Hanger
Location
U-Tube Detail
Couplings
Endcap Endcap
Hanger
Location
Endcap
Hanger
Location