Re-Verber-Ray DET3 Series User manual

DET3 Series
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.
For complete installation instructions, see the Tube Heater General Manual
that accompanies this Series Insert Manual.
The DET3 Series Infrared Tube Heater is a positive pressure, two-stage radiant heater system. This insert
manual is a supplement to the Tube Heater General Manual and provides specific information related to
the DET3 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.
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.
Keep these instructions for future reference.
LIODET3-Rev. 27512
Pr in t : R ev. 21511_ 2 M - 8 /11- r4 _11 /13 ( C DS )
Replaces: LIODET3-2M-7/09(CDS)

2
DET3 Series
Contents
1.0 Safety...................................................................3
Safety Labels and Locations ............................................3
Clearances 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.0 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.0 Parts ..................................................................18
Burner Assembly Components .........................................18
Tube and Reflector Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Kit Contents Check List ...............................................20
Approvals..........................................................20
Limited Warranty ....................................................20
NOTE: See page 10 for a list of available models and specifications.

SERVICE ACCESS PANEL
CONTROLS & GAS VALVE COMPARTMENT
1. Disconnect gas & electricity.
2. Remove four (4) thumbscrews.
3. Remove top cover.
4. Swing hinged panel downward.
KEEPCOVER IN PLACE. REMOVE FOR SERVICE ONLY.
SERVICE ACCESS PANEL
FAN COMPARTMENT
1. Disconnect gas & electricity.
2. Remove top cover (2 thumbscrews).
3. Remove tsix (6) 1/4” screws.
4. Lift and remove panel.
KEEPCOVER IN PLACE. REMOVE FOR SERV ICEONLY.
Top Panel
Bottom Panel
NEUTRAL
EARTH
HOT
- 120V HEATERINPUT -
120V
HIGH
FIRE
H
LOW
NEUTRAL
HIGH
24V
- 24V HEATER INPUT -
Air Metering Orifice
DO NOT REMOVE
TP-114
TP-3014 3”
F/N: LLAC
Air Metering Orifice
SAMPLE
3
DET3 Series
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.
Rear Panel
F/N: LLTB018 (Natural Gas)
F/N: LLTB019 (LP Gas)
F/N: LLTCL001L, C, R
Clearance to Combustibles Labels
F/N: LLLOGO4
Logo Label
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 : LLV3EP1
120V Input
F/ N : LLV3EP 2
24V Input
F/ N : LLV3EP 7
High Fire Light
NEUTRAL
EARTH
HOT
- 120V HEATER INPUT -
120V
1.0 Safety

4
DET3 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.
Clearance to Combustibles
®
DETROIT RADIANT PRODUCTS COMPANY
21400 HOOVER ROAD - WARREN, MI
RE-VERBER-RAY INFRA-RED RADIANT TUBE HEATER
FOR OUTDOOR USE AND INDOOR (Non-Residential) INSTALLATION ONLY.
Class IIIA Permanent Label
[phone] - www.drp-co.com
Volts AC:
AMPS - Starting:
AMPS - Running:
Combustion Chamber:
120V - 60Hz
1.7
1.1
4” Black Coated Aluminized
DESIGN COMPLIES WITH:
ANSI Z83.20b-2004-GAS FIRED LOW INTENSITY INFRA-RED HTR.
Manifold Pressure:
Maximum Inlet Pressure:
Minimum Inlet Pressure:
3.5 in.
14 in.
5.0 in.
W.C.P.
W.C.P.
W.C.P.
Serial No.: 0807XXXXXXXXXX 0001
MODEL NO.
DET-40-125N(-3)
Heater Type
Minimum Mounting Angle:
Maximum Mounting Angle:
C1
0
45
DEGREES
DEGREES
INPUT BTU/H
125,000 / 95,000
FOR USE WITH
Natural Gas
®
DETROIT RADIANT PRODUCTS COMPANY
21400 HOOVER ROAD - WARREN, MI
RE-VERBER-RAY INFRA-RED RADIANTTUBE HEATER
FOR INDOOR (Non-Residential) INSTALLATION ONLY.
Class IIIA Permanent Label
[phone] - www.drp-co.com
Volts AC:
AMPS - Starting:
AMPS - Running:
Combustion Chamber:
120VAC - 60Hz
1.7
1.1
4” Black Coated Aluminized
DESIGN COMPLIES WITH:
ANSI Z83.20b-2004-GAS FIRED LOW INTENSITY INFRA-RED HTR.
Manifold Pressure:
Maximum Inlet Pressure:
Minimum Inlet Pressure:
3.5 in.
14 in.
5.0 in.
Inches W.C.P.
Inches W.C.P.
Inches W.C.P.
Serial No.: 1208XXXXXXXXXX 0001
MODEL NO.
DET-40-125N(-3)
Heater Type
Minimum Mounting Angle:
Maximum Mounting Angle:
C1
0
45
DEGREES
DEGREES
INPUT BTU/H
125,000 / 95,000
FOR USE WITH
Natural Gas
SERVICE ACCESS PANEL
IGNITER & FLAME SENSE COMPARTMENT
1. Disconnect gas & electricity.
2. Remove cover by lifting top
coverupward and outward.
CAUTION: HOT SURFACE.
KEEPCOVER IN PLACE. REMOVE FOR SERVICE ONLY.
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)
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 and vapor in the vicinity the heater.
Burner Control Box Component Label
(affixed to center valve compartment lid)
Rating
Plate
Fan
Compartment
16” Burner
Tube
Primary Combustion
Chamber
Secondary Combustion
Chamber (if applicable)
ALUMINIZED TUBE
(This is the Second Chamber)
This tube is constructed of aluminized coated steel and must be
placed directly after the titanium coated “Combustion Chamber”
(orange labeled tube).
150,000-200,000 Btu/h
models only
F/N: LL01 - Clearance Safety Tag
(Affix adjacent to heater’s thermostat)
Controls
Compartment
F/N: LLTB026 F/N: LLTB024R
F/N: LLTB025L
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.
SERVICE ACCESS PANEL
SERVICE ACCESS PANEL
DET-40-125N(-3)
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.: 0804XXXXXXXXXX 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
DET3-125
7.08
36G54-224-N
MARK10DX-117
3 PCS Harness
None
None
None
None
IS22010051F5166
Grey (+ / -)
Norton
Mid
4” Gen.
Yellow - 24V
(Specify TP-#’s)
840
851
852
N/A
N/A
264E
50
201B
380
828
On Circuit Board
None
40 VA
Fasco Lg.
50Hz - 120V
When Specified
None
None
3 T-plug
6’ Blk. Cord
7/8” FC
None
N/A
826
55A
55B
N/A
N/A
832
333
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:
SAMPLE
SAMPLE

5
DET3 Series 1.0 Safety • Clearance to Combustibles
Chart 1.1 • Clearance to Combustibles in Inches (see Figure 1.1 for Mounting Angles)
When installing the tube heater system, clearances to combustibles for the model tube heater and
configuration must be maintained. Refer to Chart 1.1 below to determine the required distances for your model.
Model Number
Mounting
Angle*
Side
Top BelowFront Behind
DET (20, 30, 40) - (65, 75) [N, P] (-3) 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
DET (30, 40) - 100 [N, P] (-3) 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
DET (40, 50) - 125 [N, P] (-3) 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
DET (40, 50, 60) - 150 [N, P] (-3) 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
DET (50, 60) - 175 [N, P] (-3) 0° 34 34 692
45° 63 810 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
DET (50, 60) - 200 [N, P] (-3) 0° 41 41 694
45° 63 810 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
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.
Figure 1.1 •Mounting Angles
*
Heaters mounted on an angle between 0° to 45° must maintain clearances posted for 0° or 45°; whichever is greater.
45° Mounting Angle
0° Mounting Angle
with 1 Side Shield
(P/N: SSE)
0° Mounting Angle
with 2 Side Shields
(P/N: SSE)
Front Behind
Below
Top
Front Behind
Below
Top
Side Side
Below
Top
0° Mounting Angle
Side Side
Below
Top

6
DET3 Series
2.0 Installation
2.0 Installation • Gas and Electrical Requirements
• 120VAC-60 Hz., single-phase, 3-wire.
• 24VAC thermostat connection.
• Starting current 1.7 amps
• Running current 1.1 amps
NOTICE
Connecting the thermostat with a voltage other than 24VAC may damage the heater. The DET3 Series
requires a 24VAC connection to the thermostat. The DET3 Series is equipped with an internal relay
board. A field supplied external transformer must be installed, see wiring diagram (Figures 2.1A-B).
NOTE: A yellow control wire replaces the external terminal plug on stainless steel models or models with
water resistant upgrades.
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
Electrical Requirements
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
DET3 Series 2.0 Installation • Wiring
Wiring
Figure 2.1 •Field Wiring Diagrams
A. Single Heater, Single Thermostat.
B. Multiple Heaters, Single Thermostat.
120VAC
24VAC
120VAC Power
(observe polarity)
NOTE: If optional yellow control cord
is installed then the following wire
colors apply:
Neutral = green
Low = white
High = black
Three 1/4 in.
spade terminals
as supplied
DET3 BURNER BOX
Additional wire needed
for thermostats that
require constant power.
THERMOSTAT
24VAC
N
Low High
EXTERNAL TRANSFORMER
(field supplied)
To 120VAC grounded outlet.
N
120VAC Power (observe polarity)
NO
TE: If optional yellow control cord is
installed then the
following wire colors apply:
Neutral = gree
n
Lo
w = white
High =
black
DET3 BURNER BOX
Additional wire needed for thermostats
that require constant power.
24VAC
N
Low High
EXTERNAL TRANSFORMER
(field supplied)
THERMOSTAT
To 120VAC grounded outlet.
To 120VAC grounded outlet.
To 120VAC grounded outlet.
N
DET3 BURNER BOX
DET3 BURNER BOX
Three 1/4 in.
spade terminals
as supplied
120VAC
24VAC
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.

8
DET3 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. DET3 Ladder Diagram
B. DET3 Block Diagram
HI M
CC
HI M
CC
NEUTRAL THERMOSTAT NEUTRAL VALV E GROUND
HIGH VOLTAGE
COM
NO NC
+
120V-24V TRANSFORMER
GAS VALVE
N.O. PRESSURE
SWITCH
120VAC
BURNER
Y
O
R
LIGHT
N
BK
BL
Y
W
W
R
BK
BK
BL
RO
G
Y
BK
BK
BK
W
BK
BK
ELECTRODE
Y
LOW
RELAY
HIGH
RELAY
COM
NO NC
NEUTRAL THERMOSTAT NEUTRAL VALV E GROUND
HIGH VOLTAGE
BLOWER
MOTOR
L1 120VAC N
LIGHT
T- STAT TERMINAL
GAS VALVE
PRESSURE
SWITCH
P
M
H
ELECTRODE
ASSEMBLY
24V
120V
BKBK
RBK BK
BL
BK BK
R
W
BL
O
R
W
G
Y
BL
BK
W
Y
R
HIGH
RELAY
LOW
RELAY

9
DET3 Series 2.0 Installation
This page intentionally left blank.
There are no alternative wiring diagrams for the DET3 Series

10
DET3 Series
2.0 Installation • Product Specifications
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’ configuration (P/N: TF1B).
^ Factory recommended mounting heights are listed as a guideline.
IMPORTANT: Reference box label to determine the quantity of required baffle sections for each model heater.
HRT = Uncoated hot-rolled steel.
Alum= Black coated aluminized treated steel.
Titan = Black coated titanium stabilized aluminized steel.
Model Number Gas Type (Select One) BTU/h (High Fire) BTU/h (Low Fire) Straight Length U-Tube Length Weight (lbs.) Recommended Mounting Heights^ Combustion Chamber(s) (Black Coated) Radiant Emitter Tube(s) (Uncoated) Radiant Surface Area (sq. ft.) 36” Baffle Quantity
DET3-20-65 N or LP 65,000 50,000 21’-9” 13’-1” 120 9’ to 14’ Alum HRT 20.2 5
DET3-20-75 N or LP 75,000 50,000 21’-9” 13’-1” 120 10’ to 15’ Alum HRT 20.2 5
DET3-30-65 N or LP 65,000 50,000 31’-5” **17’-9” 160 10’ to 15’ Alum HRT 30.4 4
DET3-30-75 N or LP 75,000 50,000 31’-5” **17’-9” 160 11’ to 18’ Alum HRT 30.4 5
DET3-30-100 N or LP 100,000 65,000 31’-5” **17’-9” 160 12’ to 20’ Alum HRT 30.4 5
DET3-40-65 N or LP 65,000 50,000 41’-1” 22’-9” 190 11’ to 18’ Alum HRT 40.5 3
DET3-40-75 N or LP 75,000 50,000 41’-1” 22’-9” 190 11’ to 18’ Alum HRT 40.5 4
DET3-40-100 N or LP 100,000 65,000 41’-1” 22’-9” 190 12’ to 20’ Alum HRT 40.5 4
DET3-40-125 N or LP 125,000 82,000 41’-1” 22’-9” 190 13’ to 23’ Alum HRT 40.5 5
DET3-40-150 N or LP 150,000 100,000 41’-1” 22’-9” 190 14’ to 25’ Titan/Alum HRT 40.5 5
DET3-50-125 N or LP 125,000 82,000 50’-9” **27’-5” 235 15’ to 27’ Alum HRT 50.6 3
DET3-50-150 N or LP 150,000 100,000 50’-9” **27’-5” 235 15’ to 27’ Titan/Alum HRT 50.6 3
DET3-50-175 N or LP *175,000 125,000 50’-9” **27’-5” 235 16’ to 30’ Titan/Alum HRT 50.6 3
DET3-50-200 N or LP *200,000 145,000 50’-9” **27’-5” 235 17’ to 35’ Titan/Alum HRT 50.6 2
DET3-60-150 N or LP 150,000 100,000 60’-5” 32’-5” 265 16’ to 30’ Titan/Alum HRT 60.7 2
DET3-60-175 N or LP *175,000 125,000 60’-5” 32’-5” 265 16’ to 30’ Titan/Alum HRT 60.7 2
DET3-60-200 N or LP *200,000 145,000 60’-5” 32’-5” 265 17’ to 35’ Titan/Alum HRT 60.7 2

11
DET3 Series 2.0 Installation •Tube Sequence •Heater Length
Key
20 Foot
50 Foot
60 Foot
30 Foot
40 Foot
Figure 2.4 •Tube Installation Sequence
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.
NOTE: Refer to the Tube Heater General Manual, Chart 3.6 (page 23) for secured reflector joints.
Important! The combustion chamber(s) & radiant tube section(s) must be installed in the following order.
Baffle Location
Burner Control Box with
16” Burner Tube
Primary Combustion
Chamber Tube
Secondary Aluminized Steel
Combustion Chamber
(150-200 MBH models only)
Hot-rolled Steel Radiant
Emitter Tube
Stainless steel clamp location on 175-200 MBH models (P/N: TP-220).
Aluminized steel secondary combustion chamber location on 150-200 MBH models.
Stainless steel clamp location on 175 - 200 MBH models (P/N: TP-220).
Aluminized steel secondary combustion chamber location on 150-200 MBH models.
Aluminized steel secondary combustion chamber location on 150-200 MBH models.

12
DET3 Series
NOTE: Reference Tube Heater General Manual for installation requirements.
Sequence of Operation
Two voltages (120VAC supply and 24VAC control) must be supplied to the DET3 Series burner control box
for proper operation.
Starting Circuit: Upon a call for heat, the low fire relay is energized by 24VAC from the thermostat. The
relay is closed sending 120VAC to the blower beginning the sequence of operation.
Air pressure generated by the blower causes the normally open pressure switch to close, sending
power to the ignition module. After a seven-second pre-purge, the spark electrode, transformer and
gas valve are simultaneously energized. The trial for ignition is 15 seconds.
Single Stage Running Circuit: After ignition, the electrode monitors burner flame. If sense of flame is
lost, the control immediately disrupts power to the gas valve and then re-cycle the unit (identical to
the starting sequence). If flame sense is not established within 15 seconds, the heater will attempt
two (2) additional ignition sequences before proceeding to lockout mode. The control can be reset
by briefly interrupting the power source.
Two Stage Running Circuit: High fire operation is actuated by the thermostat sending a 24VAC signal to
the high fire relay. The energized coil of the relay is closed, allowing 24VAC to continue onto the
high fire of the gas valve.
NEUTRAL
EARTH
HOT
- 120V HEATER INPUT -
120V
HIGH
FIRE
H
LOW
NEUTRAL
HIGH
24V
- 24V HEATER INPUT -
3.0 Operation • Sequence of Operation • Operational Indicator Light
3.0 Operation
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.
Figure 3.1 • Operational Indicator Light
Light 1
Indicates High
Fire Mode
WARNING
!

13
DET3 Series
Thermostat
NOTE: Different thermostats operate according to their particular features. Refer to thermostat
specifications for details.
DET3 Series heaters require a 24VAC, two stage thermostat to operate. The burner control box is
equipped with a round terminal strip that accepts three (3) 1/4 in. female spade terminals. Do not supply
120VAC to the 24VAC connection.
Example: Desired room temperature is 65° F. The preset differential of the thermostat is 1° F.
The preset differential for High fire mode is 3° F.
When the temperature drops below the Low Fire preset differential of the thermostat (63° F), Low Fire will
activate. If the temperature continues to drop below the preset differential for High Fire, High Fire will
activate bringing the temperature back up to the Low Fire preset quickly.
3.0 Operation • Thermostat

14
DET3 Series
Is the valve switch in
the ON position?
Check that gas pressure is within
minumum and maximum inputs
as indicated on the heater’s rating
plate. Is gas pressure ok?
Does the fan
blower turn on?
4.0 Troubleshooting Guide
4.0 Troubleshooting Guide
Is the blower
obstructed?
Turn up thermostat.
Is the power at the
heater 120VAC?
No
Remove obstruction
and lubricate blower.
Does the igniter
spark?
Is the igniter
physically
damaged?
No
Yes
Replace igniter.
Yes
No
Find the source of the
electrical problem.
Check the gap on the
igniter. Is the gap between
3/16 in. and 1/4 in.?
No
Adjust gap.
Yes
No
Yes
No
During the ignition
trial, does the gas
valve open?
Yes
Test for 24VAC at the gas
valve during valve opening
(typically 10 seconds after
power to the heater). Is
there 24VAC to the valve?
No
Yes
Is 120VAC being sent
to the transformer?
No
Does the burner light?
Yes
Correct problem.
Replace
gas valve.
Yes
No
Yes
Continued on page 16.
Yes
No
Switch to the ON
position.
Yes
The circuit board and/
or wiring harness
could be faulty. These
should be replaced.
No
No
Yes
Replace 24VAC
transformer.

15
DET3 Series 4.0 Troubleshooting Guide
Correct wiring or
replace relay.
The blower is faulty
and must be replaced.
Is there 120VAC coming to the
fan from the low fire relay?
Yes
Is the inlet or outlet of
the unit obstructed? i.e.
ice, birds nest, dirt, etc.
Check for loose wiring
or restrictions in hose
connections to the pressure
switch. Are they ok?
Remove obstruction
No
Yes
No
Repair wiring or hose
connections.
No
The heater is equipped with a safety differential
pressure switch. The switch is a normally
open switch and is located in the air chamber.
Temporarilly place a jumper across the terminal of
the switch. Does the igniter spark?
Yes
Replace the pressure switch after verifying the
following:
• Baffle(s) is in the tube farthest from the burner.
• Heater, blower, squirrel cage, intake and
exhaust are clean and free from dirt and
obstructions.
• The 4 in. dia. air intake pipe does not exceed
20 ft. and/or two elbows.
• There is not a negative pressure experienced
at the area of air intake (i.e. attic space, high
winds, very tight buildings, etc.)
If any of the above were occurring, please
address the problem.
Yes
While the switch is
temporarily bypassed,
check for 120VAC from
the switch to the circuit
board. Does 120VAC
enter the circuit board?
No
Replace circuit board.
Faulty wiring.
Repair or
replace wiring.
Yes
No
Key
Start
Question
Process
Question
Corrective
Action
*
*
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.

16
DET3 Series
Does the burner
stay on briefly and
then shut off?
4.0 Troubleshooting Guide
Continued from page 14.
Check the gap on the
igniter. Is the gap between
3/16 in. and 1/4 in. ?
Check that gas pressure is within minimum and maximum inputs as
indicated on the heater’s rating plate. Is gas pressure ok?
Yes
Check that gas supply pressure meets
minimum and maximum requirements.
The following can cause the heater to shut down:
• Improper grounding.
• High winds.
• Taking combustion air from the attic.
• Dirty environment.
• Baffle not located properly.
• Fluctuating gas pressure.
No
Adjust gap.
Does the burner
stay on?
No
Does the heater stay on
until the call for heat ends?
Yes
Yes
Troubleshooting ends.
Is the heater properly
grounded? Is the
polarity correct?
Yes
No
No
Yes
Yes
No
Correct problem.
No
Flame Current Check: Single Spark & Sense
To measure flame current, disconnect input voltage, then insert a 0-50 μA DC meter and capacitor in series with the
spark electrode as shown below. Reconnect input voltage and initiate call for heat. After sparking is complete and
flame is established, meter should read 1.0 μA or higher while flame is established. If meter reads below “0” on the
scale, meter leads are reversed. Disconnect power and reconnect meter lead for proper polarity.

17
DET3 Series
Check that gas pressure is within
minumum and maximum inputs
as indicated on the heater’s rating
plate. Is gas pressure ok?
No
Differential switch may be faulty or there
is a restriction in the exhaust or intake.
Correct problem.
Yes
Check the gap
on the igniter.
Is the gap between
1/8 in. and 3/16 in.? Adjust gap.
No
4.0 Troubleshooting Guide
If heater does not enter high fire mode, check the following:
Is there 24VAC across
the red wire on the
relay board and ground
on the circuit board?
Check for 24VAC across the
COM and HIGH on the 24VAC
terminal. Is there 24VAC?
No
Yes
Repair or replace faulty
wiring or thermostat
Replace
relay.
Replace
gas valve.
Yes
No
NOTE: To confirm the heater is not in high-fire mode, check the manifold pressure (3.5 inches W.C. natural gas or 10
inches W.C. propane gas). If the indicator light is not illuminated, it is faulty and should be replaced. If the manifold
pressure ranges from 2.3 to 2.8 inches W.C. natural gas (model dependent) and 6.0 to 7.5 inches W.C. propane gas
(model dependent), the heater is in low fire mode and the troubleshooting steps described below should be followed.
Were the gas lines
purged of air?
Yes
No
Purge gas lines.
Check for damaged
insulation or loose
terminals on the
high voltage spark wire.
Is it ok?
Is the differential
switch in the
closed position?
Differential switch may be
faulty or there is a restriction
in the exhaust or intake.
No
Yes Yes
Electrode sensing may be
faulty or flame signal may
be weak. Check that heater
is operating at proper gas
pressure as indicated on
the rating label. Clean or
replace electrode if needed.
Check the spark
electrode. Is the
ceramic cracked
or loose?
No
Yes
Replace electrode.
No
Replace.

18
DET3 Series
5.0 Parts • Heater Components and Parts List
5.0 Parts
Chart 5.1 • Parts List
Figure 5.1 •Burner Assembly Components
21B
15
14
16
17
583
221
3055
3012
3011
204
3097A
3098
3008A
3002A
3099 76 212
3140, 3141
3072, 3071, 201B
3005A
5
1018
826
3001
3004
3014
55A 3003A
3051
1325
25
3052
550
828
68B
3010
219
83
3580
3033B
3096A
333
321
217
3093
70A
3060
245
3094
85
3094
84
31D
70
3044
331
832
264D/F,1264A
332
331
9
10A
Part # Description Part # Description
TP-5 Flange Gasket TP-76 Rubber Grommet
TP-9 Conduit Coupling TP-82 Reflector Center Support
TP-10A Conduit 4” x 3/4” TP-83 Stainless Steel Flexible Gas Connector
TP-14 Sight Glass Gasket TP-84 1/2 in. Female/Male Flare Fitting
TP-15 Sight Glass TP-85 1/2 in. Male / Male Flare Fitting
TP-16 Sight Glass Washer TP-105 Reflector End Cap
TP-17 Sight Glass Kit TP-106 Reflector End Cap Clips (8 pcs.)
TP-20C 10 ft. Aluminum Reflector TP-201B V.3 Mid Burner (Color Code - TAN)
TP-20D* 10 ft. Stainless Steel Reflector TP-204 Gas Orifice - Consult Factory
TP-21B 4 in. Tube Clamp TP-212 1/2” x 3” Pipe Nipple
TP-25 1/4 in. Female Spade Terminal (Qty. 3) TP-217 Brass Pressure Switch Barb Fitting
TP-26A 10 ft. Aluminized Combustion Tube TP-219 Differential Vinyl Sensing Tube
TP-26B 10 ft. Titanium Primary Combustion Tube TP-220 4 in. Dia. Stainless Steel Tube Clamp
TP-26C 10 ft. Uncoated Hot Rolled Radiant Tube TP-221 Spark Igniter Mounting Bracket Gasket
TP-31D Mounting Bracket (Qty. 2) TP-245 3/16” X 1/8” Plastic Gas Valve 90° Vent
TP-55A Fan Blower TP-264D Differential Pressure Switch, 60 to 75 MBH
TP-65I 36 in. Interlocking Turbulator Baffle Section TP-264F Differential Pressure Switch, 150 to 200 MBH
TP-68B Large Strain Relief Bushing TP-321 Ignition Plate Gasket
TP-70 1/2 in. Control Box Gasket (10.3 inches) TP-331 Green Self-Tap Ground Screw (Qty. 2)
TP-70A 1 in. Control Box Gasket (6 inches) TP-332 Divider Grommet
* Optional upgrade or add-on item.

19
DET3 Series
Figure 5.2 •Tube & Reflector Components
5.0 Parts • Heater Components and Parts List
106
26A/B
21B, 220
20C/D*
82
26A/C
65I
105
105
579
Part # Description Part # Description
TP-333 6 ft. Black 120VAC Power Cord TP-3033B DET3 Power Entry Plate
TP-550 Spark Transfer Wire - Orange TP-3044 Gas Manifold
TP-579 4 in. Wire Hanger TP-3051 35-72 DSI Circuit Board
TP-583 Spark Igniter Plate TP-3052 Wiring Harness
TP-826 40VA Transformer TP-3055 Spark Igniter Electrode
TP-828 Yellow 24VAC High Fire Indicator Light TP-3060 Pressure Switch Mounting Bracket
TP-832 Thermostat Terminal Strip TP-3071 High BTU Burner (Color Code - PURPLE)
TP-1018 APS 1/4 in. Silicone Sensing Tube TP-3072 Low BTU Burner (Color Code - GREEN)
TP-1264A Differential Pressure Switch, 100 to 125 MBH TP-3093 #8-32 Cage Nut (Qty. 4)
TP-1325 24VAC Switching Relay (Qty. 2) TP-3094 #8-32 x ½ in. Black Nylon Shoulder Screw (Qty. 4)
TP-3001 Divider Panel TP-3096A Valve Compartment Bottom Panel
TP-3002A Plastic Control Compartment End Panel TP-3097A Valve Compartment Top Panel
TP-3003A Plastic Fan Compartment End Panel TP-3098 Valve Compartment Side Panel
TP-3004 Main Control Box Panel TP-3099 Controls Mounting Panel
TP-3005A Plastic Valve Compartment Lid TP-3140 36G54-224 Gas Valve - Natural Gas Assembly
TP-3008A Gas Valve Mounting Bracket TP-3141 36G54-226 Gas Valve - LP Gas Assembly
TP-3010 Service Panel Hinge TP-3580 16 in. DSI Burner Tube Flange with Fittings
TP-3011 Spark Igniter Box
TP-3012 Spark Igniter Box Cover
TP-3014 Plastic Air Orifice w/ Screen - Contact Factory
* Optional upgrade or add-on item.

20
DET3 Series
Part No. Description 20 ft. 30 ft. 40 ft. 50 ft. 60 ft.
TP-21B 4 in. Tube Clamps 2 3 4 5** 6**
TP-25* 1/4 in. Female Spade Terminals* 3 3 3 3 3
TP-82 4 in. Reflector Center Support 1 1 1 1 1
TP-83 24 in. S.S. Flexible Gas Connector 1 1 1 1 1
TP-105 Reflector End Caps 2 2 2 2 2
TP-106 Reflector End Cap Clips 8 8 8 8 8
TP-579 4 in. Wire Hanger 3 4 5 6 7
LIOGT3 Tube Heater General Manual 1 1 1 1 1
LIODET3 DET3 Series Insert Manual 1 1 1 1 1
Filled By:
Kit Contents Check List
General Manual and
DET3 Series Insert
F/N: LIOGT3 & LIODET3
* Not included when heater is equipped with yellow control cord.
** 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.
© 2012 Detroit Radiant Products Co.
21400 Hoover Road • Warren, MI 48089
Phone: [phone] • Fax: [phone]
www.detroitradiant.com • [e-mail]
Printed in U. S. A.
5.0 Parts •Kit Contents Check List
Approvals
• CSA
• Commercial approval.
• 1 year - Burner box components.
• 2 years - Combustion and radiant tubes.
• 3 years - Stainless steel burner.
• See page 36 of the General Tube Heater Manual
for Terms and Conditions.
Limited Warranty
TP-579 4 in. Hanger
TP-105 Reflector End Cap
TP-21B 4 in. Tube Clamp
TP-106 Reflector
End Cap Clips
TP-83 24 in. Stainless
Steel Flex. Gas Connector
DET3 Series Kit Contents
TP-82 4 in. Reflector
Center Support (RCS)
Chart 5.2 • Kit Contents for DET3 Series - Reference the length column for your model.
Tube Heater
General Manual
DET3 Series
Insert Manual
TP-25* 1/4 in. Female
Spade Terminals