Detroit Radiant Products DX2 Series User manual

For Your Safety
If you smell gas:
• Do not try to light any appliance. • Immediately call your gas supplier from a neighbor’s phone.
• Do not touch any electrical switch. • Follow the gas supplier’s instructions.
• Do not use any phone in your building. • If you cannot reach your gas supplier, call the fire department.
DX2 Series
Insert Manual
For complete installation instructions, reference the Tube Heater General Manual that
accompanies this insert manual.
WARNING
!
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, injury or death. Read the installation, operation and maintenance
instructions thoroughly before installing or servicing this equipment.
This heater must be installed and serviced by trained gas installation and service
personnel only. Failure to comply could result in personal injury, asphyxiation, death,
fire or property damage.
In locations used for the storage of combustible materials, signs must be posted to
specify the maximum permissible stacking height to maintain the required clearances
from the heater to the combustibles. Signs must either be posted adjacent to the
heater thermostats or in the absence of such thermostats, in a conspicuous location.
Not for residential use! Do not use this heater in the home, sleeping quarters,
attached garages, etc. Installation of a commercial tube heater system in residential
indoor spaces may result in property damage, serious injury, asphyxiation or death.
The DX2 Series Infrared Tube Heater is a positive pressure, single-stage radiant heater system. This
insert manual is a supplement to the Tube Heater General Manual and provides specific information
related to the DX2 Series model. All persons involved with the installation, operation and maintenance of
the heater system must read and understand the information in this insert manual and the accompanying
Tube Heater General Manual.
INSTALLER: Present this manual to the end user.
Keep these instructions in a clean and dry place for future reference.
Model#: ___________________ Serial #: _________________________
LIODX2a- Rev. 18111
Print: 1M -08/16_r2-01/17 (CDS)
Replaces: LIODX2a-5c-07/15 (CDS)
(located on rating label)

2
DX2 Series
Contents
1.0 Safety ..................................................................3
Safety Labels and Locations ............................................3
Clearance to Combustibles .............................................4
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Gas Requirements ...................................................6
Electrical Requirements................................................6
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Specifications ......................................................10
Tube Installation Sequence ............................................11
3.0 Operation ..............................................................12
Sequence of Operation ...............................................12
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operational Indicator Lights............................................13
4.0 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.0 Parts ..................................................................18
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Parts List ..........................................................18
Kit Contents Check List ...............................................20
Approvals..........................................................20
Limited Warranty ....................................................20
NOTE: See page 10 for a list of available models and specifications.

DX2-40-125N
Data on this label is for the model shown on this label. If your heater has been converted,
this information is not accurate. Please contact the factory for assistance.
BURNER COMPONENTS:
For parts replacement information, contact factory at 586-756-0950 or visit www.drp-co.com/parts.
Serial No.: 0914XXXXXXXXXX 0001
Gas Valve:
Circuit Board:
Wire Harness:
N.O. Switch:
N.O. VL Orifice:
N.C. Switch:
N.C. VL Orifice:
Diff Switch:
Diff VL Orifice:
Igniter:
Burner:
16” Tube:
Ind. Lights:
Diag. Light:
Term. Block:
Transformer:
Fan:
Alt. Fan:
Alt. Fan Usage:
Relay:
Filter:
24 Volt In:
120 Volt In:
Gas In:
Extra VL Orifice:
Production Code:
Version:
Stock:
Add-On:
Internal Use Only:
HEATER
TYPE: Electric:
Tag:
Special 1:
Special 2:
Gas:
Air:
C1
C1 C2 C3
None
N/A
DX2-125
9.14
VR4205-1324
MARK10DX-117
3 PCS Harness
None
None
None
None
IS22010051F5166
Grey (+ / -)
Norton
Low-Mid
4” Gen.
Yellow - 120V
(Specify TP-#’s)
240
351A
352A
N/A
N/A
264E
50
3072
380
328
On Circuit Board
None
40 VA
Fasco Lg.
50Hz - 120V
When Specified
None
None
3 T-plug
2 x 4 Box
7/8” FC Flare
None
N/A
N/A
55A
55B
N/A
N/A
832
66
83
19
1 5/16”
TP-204#
TP-44#
19
1 7/16”
LLWT038
None
19
1 5/16”
17
1 7/16”
Orifice Type:
1.0 Safety
Manifold Pressure
Max. Inlet Pressure
Min. Inlet Pressure for
Purpose of Input Adjustment
Min. Mounting Angle
Max. Mounting Angle
Combustion Chamber
W.C.P.
W.C.P.
W.C.P.5.0in.
14.0in.
3.5in.
0 DEGREES
45 DEGREES
4” BC Aluminized
120V
4.8
1.1
C1
VOLTS AC 60Hz
AMPS - Starting
AMPS - Running
Heater Type:
DESIGN COMPLIES WITH:
ANS Z83.20b-2003-GAS FIRED LOW INTENSITY INFRA-RED HTR.
For Stainless Steel Upgrades the Combustion Table is upgraded to 409 Stainless Steel
Serial No. 0603DETR12345 0001
DETROIT RADIANT PRODUCTS CO.
21400 HOOVER ROAD - WARREN, MI 48089
[phone] www.reverberray.com
HL2 - 40 - 125N
MODEL NO.
125,000 / 95,000
INPUT BTU/H
NAT GAS
FOR USE WITH
RE-VERBER-RAY INFRA-RED RADIANT TUBE HEATER
FOR INDOOR INSTALLATION ONLY
DX 125,000
SAMPLE
SAMPLE
3
DX2 Series
Air Metering Orifice
DO NOT REMOVE
TP-114
TP-3014 3”
Safety Labels and Their Locations
1.0 Safety • Safety Labels and Locations
Read and understand all safety information and warnings in this insert manual and the
Tube Heater General Manual before installation, operation and maintenance of the
radiant tube heater system.
Back Panel
Top Panel
Bottom Panel
Rating
Plate
F/N: LLTB018 (Natural Gas)
F/N: LLTB019 (Propane Gas)
F/N: LLTCL001 Clearance to
Combustibles Label.
F/N: LLLOGO1
Burner Control Box
Component Label
(located under the top
panel)
Product safety signs or labels should be replaced by the product user when they no longer are legible.
Contact either your local distributor or the product manufacturer for obtaining replacement signs or labels.
F/N: LLAC
Air Metering Orifice
SAMPLE

WARNING
!
Placement of explosive objects, flammable objects, liquids and vapors close to
the heater may result in explosion, fire, property damage, serious injury or
death. Do not store or use explosive objects, liquids or vapor in the vicinity of
the heater.
F/ N : L LV3 EP 6
SERVICE ACCESS PA NEL
IGNITER & FLAME SENSE COMPARTMENT
1. Turn off gas & electricity.
2. Remove cover by lifting top
cover upward and outward.
CAUTION: HOT SURFACE.
KEEP COVER IN PLACE. REMOVE FOR SERVICE ONLY.
4
DX2 Series
1.0 Safety • Safety Labels and Locations • Clearance to Combustibles
Clearance to combustibles is defined as the minimum distance that must exist between the tube surface,
or reflector, and any combustible items (see Figure 1.1). It also pertains to the distance that must be
maintained from moving objects around the tube heater.
When installing the tube heater system, clearances to combustibles for your series tube heater and
configuration must be maintained. Refer to Chart 1.1 on the following page to determine the required
distances for your model.
The stated clearance to combustibles represents a surface temperature of 90ºF (32ºC) above room
temperature. Building materials with a 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.
Clearance to Combustibles
Right Panel
(Valve Compartment)
Radiant
Tube (s)
Primary Combustion
Chamber
16” Burner Tube
Left Panel
(Fan Compartment)
F/N: LLTB026
AVOID EQUIPMENT FAILURE
THIS 10 FT. TUBE IS THE
COMBUSTION CHAMBER.
THIS TUBE MUST BE THE FIRST TUBE
FOLLOWING THE BURNER CONTROL BOX.
!
INSTALLER
The combustion chamber utilizes either 409
stainless, titanium alloy or aluminized steel -
depending on the model number of your heater.
Rotate the tube’s welded seam to bottom.
Consult the manual(s) for further details.
F/N: LLTB004 (orange)
F/N: LL01 - Clearance Safety Tag
(Affix adjacent to heater’s thermostat)
SERVICE ACCESS PANEL
IGNITER & FLAME SENSE COMPARTMENT
1. Turn off gas & electricity.
2. Remove cover by lifting top
cover upward and outward.
CAUTION: HOT SURFACE.
KEEP COVER IN PLACE. REMOVE FOR SERVICE ONLY.

5
DX2 Series
Model Number
Mounting
Angle*
Side
Top BelowFront Behind
DX2 (20, 30, 40) - 50, 60 [N, P] 0° 99647
45° 39 810 47
with 1 side shield 0° 29 8 6 47
with 2 side shields 0° 99647
20 ft. from burner 0° 77630
DX2 (20, 30, 40) - 75 [N, P] 0° 99660
45° 39 810 60
with 1 side shield 0° 29 8 6 60
with 2 side shields 0° 99660
20 ft. from burner 0° 77630
DX2 (20, 30, 40, 50) - (80, 100) [N, P] 0° 14 14 666
45° 39 810 66
with 1 side shield 0° 29 8 6 66
with 2 side shields 0° 16 16 666
20 ft. from burner 0° 77630
DX2 (30, 40, 50, 60) - 125 [N, P] 0° 20 20 676
45° 58 810 76
with 1 side shield 0° 42 8 6 76
with 2 side shields 0° 20 20 676
20 ft. from burner 0° 77630
DX2 (40, 50, 60) - 150 [N, P] 0° 24 24 681
45° 58 810 81
with 1 side shield 0° 42 8 6 81
with 2 side shields 0° 23 23 681
20 ft. from burner 0° 11 11 644
DX2 (40, 50, 60, 70) - 175 [N, P] 0° 34 34 692
45° 63 8 10 92
with 1 side shield 0° 50 8 6 92
with 2 side shields 0° 30 30 692
20 ft. from burner 0° 11 11 644
DX2 (50, 60, 70, 80) - 200 [N, P] 0° 41 41 694
45° 63 8 10 94
with 1 side shield 0° 54 8 6 94
with 2 side shields 0° 30 30 694
20 ft. from burner 0° 11 11 644
1.0 Safety • Clearance to Combustibles
Chart 1.1 • Clearance to Combustibles in Inches (see Figure 1.1 for Mounting Angles)
Figure 1.1 •Mounting Angles
0° Mounting Angle 45° Mounting Angle
0° Mounting Angle
with 1 Side Shield
(P/N: SSE)
0° Mounting Angle
with 2 Side Shields
(P/N: SSE)
Side Side
Below
Top
Front Behind
Below
Top
Front Behind
Below
Top
Side Side
Below
Top
Heaters mounted on an angle between 0° to 45° must maintain clearances posted for 0° or 45°; whichever is greater.
*

NOTICE
6
DX2 Series
2.0 Installation
2.0 Installation • Gas Requirements • Electrical Requirements
Electrical Requirements
• 120VAC - 60 Hz GRD, 3-wire.
• 120VAC thermostat connection.
• Starting current 4.8 amps
• Running current 1.1 amps
The DX2 Series comes standard requiring a 120VAC connection to the thermostat. An optional 24VAC
internal relay (24VAO) may be factory installed if the heater is to be controlled via a 24VAC thermostat.
A 40VA transformer is necessary when using the 24VAO option.
NOTE: A relay transformer may be used in lieu of the factory installed 24VAO option.
Instructions for the following are detailed in the Tube Heater General Manual:
• Design considerations
• Hanger suspension and placement
• Tube layout and assembly
• Burner control box suspension
• Reflectors (and accessories)
• Venting and combustion air intake
• Gas requirements
• Baffle assembly
Note: Electronic versions of all manuals are available at www.detroitradiant.com
WARNING
!
Improper installation, adjustment, alteration, service or maintenance can cause property
damage, serious injury or death. Read and understand, the installation, operating and
maintenance instructions thoroughly before installing or servicing this equipment. Only
trained, qualified gas installation and service personnel may install or service this
equipment.
Not for residential use! Do not use this heater in the home, sleeping quarters, attached garages,
etc. Installation of a commercial tube heater system in residential indoor spaces may result in property
damage, serious injury or death.
Gas Requirements
Type of Gas Required Manifold
Pressure
Minimum Inlet
Pressure
Maximum Inlet
Pressure
Natural 3.5 Inches W.C. 5.0 Inches W.C. 14.0 Inches W.C.
Liquefied Petroleum 10.0 Inches W.C. 11.0 Inches W.C. 14.0 Inches W.C.
IMPORTANT: Consult the Tube Heater General Manual for gas connection requirements.

7
DX2 Series
120VAC-60 Hz.
Supply
NOTE: Up to 4 line voltage tube heaters can
be wired to most thermostats.
L1
Neutral
Ground
Heaters on the same vent must
share the same thermostat.
Additional heaters
Burner BoxBurner Box
2.0 Installation • Wiring
WARNING
!
Electric Shock
Field wiring to the tube heater must be connected and grounded in accordance with national,
state, provincial, local codes and to the guidelines in the Tube Heater General Manual and
Series Insert Manual. In the United States refer to the most current revisions to the ANSI/
NFPA 70 Standard and in Canada refer to the most current revisions to the CSA C22.1 Part I
Standard.
Wiring
Figure 2.1 •Field Wiring Diagrams
A. 120VAC Single/Multiple Line Voltage Heater(s)
B. 24VAO (Internal Relay Option)
COM 24V
Burner Control
Box w/ 24VAO
L1
N
120 Volt Power (Observe polarity)
24VAC Digital
Thermostat
120 VAC
24VAC
Common
W
R
COM 24V
COM 24V
Burner Control
Box w/ 24VAO
Burner Control
Box w/ 24VAO
Common required
for thermostats
that require
constant power.
Common required
for thermostats
that require
constant power.
1/4” spade terminals
required (as supplied)
External
Transformer
(field suppied)

8
DX2 Series
2.0 Installation • Wiring
Before field wiring this appliance - Check existing wiring; replace if necessary.
Note: If any of the original wire supplied with the appliance must be replaced, it must be replaced with
wiring material having a temperature rating of at least 105° C.
Figure 2.2 • Internal Wiring Diagrams
A. Ladder Diagram - TP-351A
B. Block Diagram - TP-351A
W
R
BK
BK
BK
Ground
Neutral
Valve
Neutral
TH
Line1
SIC1
Probe
W
BK
BK BK
BK
BK
BR
W
G
120VA
C
N
L1
O
BK
W
BK
Terminal Block
Pressure Switch
Indicator Lights
Blower
Burner
Igniter
Flame
Rod
Ignition Module
Gas Valve
SIC1
LINE1
NEUT
GND
NEUT
TH
PROBE
VALVE
BK
BK
BK
BK
G
BR
W
BK
BK
W
W
N
R
BK
O
BK
BK
120VACL1
Blower
Indicator Lights
Pressure Switch
Igniter
Ignition Module
Gas Valve
Flame Rod
BK

W
BK
LINE1
IGNITION MODULE
BR
SIC1
PROBE
BK
NEUT
NEUT
VALVE
TH
GND
R
O
W
BK
120VACL1
BK
BK
G
W
N
BK
BK
BK
24VAC
Blower
Indicator Lights
Gas Valve
Pressure Switch
Igniter
Thermostat
Te rminal
NO NC
COM
Relay
BK
BK
W
BK W
R
Ground
Neutral
Valve
Neutral
TH
Line1
SIC1
Probe
G
BK
24VAC
BK
BK
BR
BK
BK
W
L1
120VAC
N
BK O
BK W
BK
Ignition Module
Pressure Switch
Indicator Lights
Blower
Burner
Igniter Flame
Rod
Te rminal Block
Thermostat
Te rminal
NO NC
COM
Relay
Gas Valve
9
DX2 Series 2.0 Installation • Wiring
Figure 2.3 •Alternative Wiring Diagrams
A. TP-351A Ladder Diagram - Internal Relay Option (24VAO)
B. TP-351A Block Diagram - Internal Relay Option (24VAO)

Model Number Gas Type (Select One) BTU/h Straight Length (Dim A) U-Tube Length (Dim. B) Weight (lbs.) Stainless Steel Weight (lbs.) Recommend Mounting Height Combustion Chamber (Black Coated) Radiant Emitter Tube(s) (Black Coated) Radiant Surface Area (sq. ft.) 36” Baffle Sections
DX2-20-50 N or P 50,000 21’-8” 13’-0” 120 N/A 9’ to 15’ Alum Alum 20.2 5
DX2-20-60 N or P 60,000 21’-8” 13’-0” 120 N/A 10’ to 15’ Alum Alum 20.2 5
DX2-20-75 N or P 75,000 21’-8” 13’-0” 120 145 11’ to 18’ Alum Alum 20.2 5
DX2-20-80 N or P 80,000 21’-8” 13’-0” 120 145 11’ to 18’ Alum Alum 20.2 5
DX2-30-50 N or P 50,000 31’-4” **17’-8” 160 N/A 10’ to 15’ Alum Alum 30.4 4
DX2-30-60 N or P 65,000 31’-4” **17’-8” 160 N/A 11’ to 18’ Alum Alum 30.4 4
DX2-30-75 N or P 75,000 31’-4” **17’-8” 160 195 12’ to 20’ Alum Alum 30.4 4
DX2-30-80 N or P 80,000 31’-4” **17’-8” 160 195 12’ to 20’ Alum Alum 30.4 5
DX2-30-100 N or P 100,000 31’-4” **17’-8” 160 195 13’ to 23’ Alum Alum 30.4 5
DX2-30-125 N or P 125,000 31’-4” **17’-8” 160 195 14’ to 25’ Alum Alum 30.4 5
DX2-40-50 N or P 50,000 41’-0” 22’-8” 190 N/A 11’ to 18’ Alum Alum 40.5 2
DX2-40-60 N or P 60,000 41’- 0” 22’-8” 190 N/A 11’ to 18’ Alum Alum 40.5 2
DX2-40-75 N or P 75,000 41’-0” 22’-8” 190 235 12’ to 20’ Alum Alum 40.5 2
DX2-40-80 N or P 80,000 41’-0” 22’-8” 190 235 12’ to 20’ Alum Alum 40.5 5
DX2-40-100 N or P 100,000 41’-0” 22’-8” 190 235 13’ to 23’ Alum Alum 40.5 4
DX2-40-125 N or P 125,000 41’-0” 22’-8” 190 235 14’ to 25’ Alum Alum 40.5 4
DX2-40-150 N or P 150,000 41’-0” 22’-8” 190 235 15’ to 27’ Titan Alum 40.5 4
DX2-40 -175 N or P *175,000 41’-0” 22’-8” 190 N/A 16’ to 30’ Titan Alum 40.5 4
DX2-50-100 N or P 100,000 50’-8” **27’-4” 235 290 15’ to 27’ Alum Alum 50.6 2
DX2-50-125 N or P 125,000 50’-8” **27’-4” 235 290 15’ to 27’ Alum Alum 50.6 4
DX2-50-150 N or P 150,000 50’-8” **27’-4” 235 290 16’ to 30’ Titan Alum 50.6 4
DX2-50-175 N or P *175,000 50’-8” **27’-4” 235 N/A 17’ to 35’ Titan Alum 50.6 2
DX2-50-200 N or P *200,000 50’-8” **27’-4” 235 N/A 18’ to 40’ Titan Alum 50.6 2
DX2-60-125 N or P 125,000 60’-4” 32’-4” 265 330 16’ to 30’ Alum Alum 60.7 2
DX2-60-150 N or P 150,000 60’-4” 32’-4” 265 330 17’ to 35’ Titan Alum 60.7 2
DX2-60-175 N or P *175,000 60’-4” 32’-4” 265 N/A 17’ to 35’ Titan Alum 60.7 2
DX2-60-200 N or P *200,000 60’-4” 32’-4” 265 N/A 18’ to 40’ Titan Alum 60.7 2
DX2-70-175 N or P *175,000 70’-0” **37’-2” 300 N/A 19’ to 42’ Titan Alum 70.9 2
DX2-70-200 N or P *200,000 70’-0” **37’-2” 300 N/A 19’ to 42’ Titan Alum 70.9 2
DX2-80-200 N or P *200,000 79’-8” 42’-0” 330 N/A 20’ to 45’ Titan Alum 81.0
2
10
DX2 Series
2.0 Installation • Product Specifications
Chart 2.1 • Specifications
* Model requires stainless steel tube clamp (P/N: TP-220) to be located at the seam between the primary
combustion chamber and the secondary combustion tube downstream of the burner control box.
** Model requires 5EA-SUB accessory package when installing in a U-shaped configuration (P/N: TF1B).
Titan = Coated titanium treated steel.
Alum = Coated aluminized treated steel.
Specifications

Tube Installation Sequence
20 Foot
50 Foot
60 Foot
70 Foot
30 Foot
40 Foot
Stainless Steel Clamp on 175 - 200 MBH models (P/N: TP-220).
Figure 2.4 •Tube Installation Sequence
Stainless Steel Clamp on 175 MBH models (P/N: TP-220).
Stainless Steel Clamp Location (P/N: TP-220).
Important! The combustion chamber & radiant tube sections must be installed in the following order.
80 Foot
Stainless Steel Clamp on 175 - 200 MBH models (P/N: TP-220).
Stainless Steel Clamp Location (P/N: TP-220).
Key
Burner Control Box with
16” Burner Tube
Black Coated Combustion
Chamber Tube*
Black Coated Aluminized Combustion
Chamber/Radiant Emitter Tube
Standard Tube Clamp
Stainless Steel Tube
Clamp (P/N: TP-220)
175-200 MBH models only - Located
between 1st and 2nd 10 ft. tube sections.
*Aluminized steel (50,000 to 125,000 BTU/h models), Titanium stabilized aluminized steel (150,000 to 200,000
models). NOTE: Refer to the Tube Heater General Manual, Chart 3.6 (page 23) for secured reflector joints.
Baffle Location
11
DX2 Series 2.0 Installation •Tube Sequence •Heater Length

WARNING
!
12
DX2 Series
3.0 DX2 Series Operation • Sequence of Operation • Thermostat • Diagnostics
3.0 Operation
Note: Reference the Tube Heater General Manual for installation requirements.
Sequence of Operation
Starting Circuit: Upon a call for heat, the fan is energized. Once operational static pressure is achieved,
the differential switch will close initiating the ignition sequence. After a 5-second delay, the Glo-bar™
is energized for 45 seconds and the control allows the gas valve to open.
The trial for ignition is 8 seconds. If flame sense is not established within 8.5 seconds, the heater will
attempt two (2) additional ignition sequences before proceeding to soft lockout. Soft lockout
automatically retries after one (1) hour or the control can be reset by briefly interrupting the power
source.
Running Circuit: After ignition, the flame rod monitors burner flame. If sense of flame is lost, the control
immediately acts to reignite the gas-air mixture (identical to the starting sequence). If flame sense is
not established within 8.5 seconds, the heater will attempt two (2) additional ignition sequences
before proceeding to soft lockout. The control can be reset by briefly interrupting the power source.
Thermostat
NOTE: Different thermostats operate according to their particular features. Refer to thermostat
specifications for details.
The DX2 Series comes standard requiring a 120VAC connection to the thermostat. An optional 24VAC
internal relay (24VAO) may be factory installed if the heater is to be controlled via a 24VAC thermostat.
A 40VA transformer is necessary when using the 24VAO option (Figure 2.1B).
NOTE: A relay transformer may be used in lieu of the factory installed 24VAO option.
This heater must be installed and serviced by trained gas installation and service
personnel only.
Do not bypass any safety features or the heater’s built in safety mechanisms will be
compromised.

13
DX2 Series
VALV E
PS
PRESSURE
SWITCH
V
3.0 Operation • Diagnostics
Figure 3.1 • Operational Indicator Lights
Light 1
Indicates Valve
Opens
Light 2
Indicates Pressure
Switch Closes
Operational Indicator Lights
Operational Indicator Lights
The externally located operational indicator lights are provided to assist in troubleshooting of the heater.
Refer to the following pages for additional troubleshooting.

Is the blower
obstructed?
Replace circuit board.
14
DX2 Series
Does the igniter warm
up and glow red?
Is the igniter
physically
damaged?
Check voltage at igniter during
ignition sequence (usually 30-
45 seconds after power to the
heater). Is it 120V?
Is the inlet or the outlet of
the unit obstructed (i.e.,
ice, birds nest, dirt, etc.)?
4.0 Troubleshooting Guide
4.0 Troubleshooting Guide
Turn up thermostat
Does the fan
blower turn on?
Is the power at the
heater 120V?
Find the source of the electrical
problem between panel and heater.
No
Yes
Remove obstruction
and lubricate fan.
No
Yes
Does the switch
light energize?
Yes
Is the light burnt out?
If so, replace.
No No
Yes
Remove obstruction.
No
No No
No
Yes
Yes
Replace igniter.
Does valve light
energize?
Yes
Does the burner
ignite at all?
No
The circuit board and/or wiring
harness may be faulty and
needs to be replaced.
No
Yes
Replace faulty light.
Does valve open?
Yes
Confirm that gas pressure
is within minimum and
maximum inputs as
indicated on the burner
rating plate. Are they ok?
Correct problem.
No
Replace gas valve.
Yes
Yes
Continued on page 16.
No
No
Yes

NOTICE
Bypassing any switch is intended for testing purposes only. Do not leave switch bypassed
during normal operation or the heater’s built-in safety mechanisms will be compromised.
Is 120V coming
to the fan?
Check for loose wiring
or resistance in hose
connection to pressure
switch. Are they ok?
The heater is equipped with a safety pressure
switch. This differential switch, located in
the valve compartment, is a normally open
pressure switch. Temporarily place jumpers
across the terminals of the switch (Be sure to
reinstall the burner control box cover).
Does the light energize?
15
DX2 Series 4.0 Troubleshooting Guide
Key
Start
Question
Process
Question
Corrective
Action
Yes
No
The fan is faulty
and must be
replaced.
Correct
wiring.
Repair.
No
Yes
Yes
Replace faulty light.
No
Replace the differential switch after verifying the following:
• Baffle(s) is/are in the radiant tube(s) farthest from the burner.
• The heater, fan blower, squirrel cage, intake and exhaust are free from
dirt and obstructions.
• The 4” air intake pipe does not exceed 20 feet and/or 2 elbows.
• There is not a negative pressure experienced at the area of air intake
(i.e., attic space, high winds, very tight building).
If any of the above are occurring, please address the problem.
Is resistance through
the igniter 50-400 Ω ?
Replace
igniter.
No
Consult
factory.
Yes

16
DX2 Series
Does the
burner ignite?
4.0 Troubleshooting Guide
After igniter is
warmed up, does
gas valve open?
Test for 120V at valve opening period (usually 30 to 45 seconds
after power to heater). Is there 120V to valve for 8 seconds?
Replace circuit board and/or wiring harness.
Does the burner
stay on?
Is the gas supply
to the heater in
the ON position?
Check to make sure gas pressure is within
minimum and maximum inputs, as indicated on
burner rating plate. Is gas pressure OK?
Does the burner stay on
for approx. 8 seconds
and then shut off?
Does the burner come
on and turn off
immediately (1 or 2
seconds)?
Check to make sure gas pressure
is within minimum and maximum
inputs, as indicated on the burner
rating plate. Is gas pressure OK?
Pressure
switch may
be faulty or
there is a
restriction in
the exhaust.
Does the heater
stay ON until a call
for heat ends?
Troubleshooting ends
The heater can shut down due to:
• Improper grounding.
• High winds.
• Taking combustion air from the attic.
• Dirty environment.
• Improperly positioned baffles.
• Fluctuating gas pressure.
No
Yes
No
No Yes
Yes
No
Correct problem.
Yes
Yes
Yes
No
Yes
No
Yes
No
Yes
No
Turn on.
Continued from page 14
Yes
Correct problem.
No

17
DX2 Series
Check to make sure gas pressure is within minimum and
maximum inputs, as indicated on burner rating plate.
Is gas pressure OK?
Were the gas lines purged of air?
Is the heater properly
grounded? Is the heater’s
polarity correct?
With micrometer, check
amperage at flame rod. Is it
greater than .7 microamps?
Check to make sure flame
sensor wire is OK. If so,
then replace circuit board.
Sensing rod is faulty or flame
is weak. Check to make sure
heater is operating at proper
gas pressure as indicated on
burner rating plate and then, if
needed, replace sensing rod.
Replace gas valve.
Yes
Correct problem.
Correct problem.
No
No
Yes Yes
No
Purge gas line.
No
4.0 Troubleshooting Guide
Yes
Confirm manifold pressure is
correct and/or gas orifice is not
plugged and is the correct size.

18
DX2 Series
5.0 Parts • Heater Components and Parts List
*Stainless steel upgrades available. ** 6 feet total required to cover outer edges of the burner control box.
Figure 5.1 •Burner Assembly
Components
5.0 Parts
Part No. Description Part No. Description
TP-1 Control Box Cover TP-31B Control Box Mounting Bracket
TP-5 Flange Gasket TP-33B 1/2” Shut-Off Ball Valve / Inlet Tap
TP-9 Conduit Coupling TP-50 Glo-Bar™ Igniter
TP-10 Conduit 4” x 1/2” TP-55A Fan Blower
TP-11 Glo-Bar™ Igniter Box TP-65I 36” Interlocking Turbulator Baffle
TP-12 Glo-Bar™ Igniter Box Cover TP-66 2” x 4” Outlet Box
TP-13 8 x 1/2” Self-Drilling Screw TP-67 2” x 4” Outlet Box Cover
TP-14 Sight Glass Gasket TP-70 Control Box Cover Gasket (per foot**)
TP-15 Sight Glass TP-76 Rubber Grommet
TP-16 Sight Glass Washer TP-82 Reflector Center Support (RCS)
TP-17 Sight Glass Kit TP-83 24” Stainless Steel Flexible Gas Connector
TP-19B 4” Wire Hanger with Tension Spring TP-84 1/2” Female / Male Flare Fitting
TP-20C 120” Aluminum Reflector TP-97 1/4” x 1/4” Brass Int./Ext. Atmos. Barb Fitting
TP-20D 120” Stainless Steel Reflector* TP-105 Aluminum Reflector End Cap
TP-21B 4” Standard Tube Clamp TP-106 Reflector End Cap Clips (8 pcs.)
TP-26A 10 ft. Coated-ALUM Combustion/Radiant Tube TP-113 Reflector Tension Spring
TP-26B 10 ft. Coated-AL-TI Combustion Tube TP-114 Plastic Air Orifice with Screen (consult factory)
TP-26D 10 ft. 304 Stainless Steel Radiant Tube* TP-200A Burner (Blue) - consult factory
TP-26E 10 ft. 409 Stainless Steel Combustion Tube* TP-201B Burner (Tan) - consult factory
Chart 5.1 • Parts List
205
383A 221
222
11
50
321
1
NOPS
207
97
218
219
55A
302, 302A
351A 352A
70
328
114
31B
33B
83
212
208B
TP-240, 241
223
204
200A or 201B
303
12
9
10
217
5380, 202
15
14
16
21B
222A
214
304, 804
76
31B
13
13
17
301
67
331
84
66
329 206

19
DX2 Series
Figure 5.2 •Tube & Reflector Components
19B
106
105
26A, 26B, 26E
21B, 220
20C, 20D
82
26A, 26D
65I
5.0 Parts • Heater Components and Parts List
113
Part No. Description Part No. Description
TP-202 16” Burner Tube with Flange (fittings included) TP-301 Center Divider Panel
TP-204 Gas Orifice (consult factory) TP-302 End Panel, Left
TP-205 Glo-Bar™ Holder TP-302A End Panel, Left with 24VAO Option.
TP-206 Glo-Bar™ Holder Spring Clip TP-303 End Panel, Right
TP-207 Pressure Switch Mounting Bracket TP-304 Burner Control Box Outer Shell w/ PC-36
TP-208B Gas Valve Mounting Bracket TP-321 Ignition Plate Gasket
TP-212 1/2” x 3” Pipe Nipple TP-328 120V Amber Operational Indicator Light
TP-214 Glo-Bar™ Wiring Harness TP-329 1/4” Neutral Terminal Block
TP-217 Pressure Switch Barb TP-331 Green Self Tap Ground Screw
TP-218 Differential Switch Vinyl Sensing Tube (exhaust) TP-351A Potted Circuit Board
TP-219 Differential Vinyl Sensing Tube (burner) TP-352A Circuit Board Wiring Harness for TP-351A
TP-220 Stainless Steel Tube Clamp (175 & 200 MBH)* TP-380 16” Burner Tube with Flange (no fittings)
TP-221 Glo-Bar™ Holder Gasket TP-383A Glo-Bar™ Igniter Plate
TP-222 Flame Rod TP-804 Burner Control Box Outer Shell
TP-222A Flame Rod Wire TP-NOPS Normally Open Pressure Switch; select below:
TP-223 Gas Manifold TP-264B Differential Pressure Switch, 65 to 100 MBH
TP-240 VR4205M-1324 Gas Valve Assembly - Nat. Gas TP-264E Differential Pressure Switch, 125 & 150 MBH
TP-241 VR4205M-1357 Gas Valve Assembly - Prop. Gas TP-264D Differential Pressure Switch, 175 MBH
TP-244 Plastic Gas Valve Vent TP-264F Differential Pressure Switch, 200 MBH

Part No. Description 20 Ft. 30 ft. 40 ft. 50 ft. 60 ft. 70 ft. 80 ft.
TP-19B 4” Hanger w/ Tension Spring 3456789
TP-21B 4” Tube Clamp 2 3 4* 5* 6* 7* 8*
TP-33B 1/2” Shut-Off Valve w/ Inlet Tap 1111111
TP-82 4” Reflector Center Support 2345678
TP-83 24” S.S. Flexible Gas Connector 1111111
TP-105 Reflector End Cap 2222222
TP-106 Reflector End Cap Clips 8888888
LIOGTa General Tube Heater Manual 1111111
LIODX2a DX2 Series Insert Manual 1111111
Additional kit contents as supplied when heater is configured with Add-On Options (if applicable)
TP-25 1/4” Female Spade Terminal (24VAO) 2222222
Filled By:
20
DX2 Series
Limited Warranty
• 1 year - Burner box components.
• 5 years - Combustion and radiant tubes.
• 10 years - Stainless steel burner.
• See page 36 of the General Tube Heater Manual
for terms and conditions.
DX2 Series
Insert Manual
Chart 5.2 • Kit Contents for DX2 Series - Reference the length column for your model.
TP-19B 4” Hanger with
Reflector Tension Spring
TP-105 Reflector End Cap
TP-21B 4” Tube Clamp
TP-106 Reflector
End Cap Clips
TP-33B 1/2” Shut-Off Valve
(Ball Valve & Inlet Tap)
TP-83 24” Stainless Steel
Flexible Gas Connector
Kit Contents Check List
DX2 Series Kit Contents
Tube Heater
General Manual and
DX2 Series Insert Manual
F/N: LIOGTa & LIODX2a
TP-82 4” Reflector
Center Support (RCS)
*NOTE: One 4” stainless steel tube clamp (P/N: TP-220) is provided for each 175,000 - 200,000 BTU model. Place
as shown on page 11.
5.0 Parts •Kit Contents Check List
Approvals
• CSA.
• Indoor approval.
• Outdoor approval with OD-Kit.
• Commercial approval.
Tube Heater
General Manual
© 2017 Detroit Radiant Products Co.
21400 Hoover Road • Warren, MI 48089
Phone: [phone] Fax: [phone]
www.detroitradiant.com • [e-mail]
Printed in U.S.A.