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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: LLV3EP6

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.

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.

Summary of Contents for DX2 Series

Page 1: ...rmissible 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 i...

Page 2: ...ments 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 Compo...

Page 3: ...g 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 COMP...

Page 4: ...required distances for your model The stated clearance to combustibles represents a surface temperature of 90 F 32 C above room temperature Building materials with a low heat tolerance such as plasti...

Page 5: ...1 45 58 8 10 81 with 1 side shield 0 42 8 6 81 with 2 side shields 0 23 23 6 81 20 ft from burner 0 11 11 6 44 DX2 40 50 60 70 175 N P 0 34 34 6 92 45 63 8 10 92 with 1 side shield 0 50 8 6 92 with 2...

Page 6: ...ake 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 caus...

Page 7: ...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 Dia...

Page 8: ...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 120VAC N L1 O BK W BK Termina...

Page 9: ...round 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 Terminal Block The...

Page 10: ...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 D...

Page 11: ...s 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 S...

Page 12: ...nitors 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 h...

Page 13: ...ghts 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 t...

Page 14: ...er 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...

Page 15: ...s 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 Replac...

Page 16: ...ner 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...

Page 17: ...eater 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...

Page 18: ...r 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...

Page 19: ...arness 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 Differ...

Page 20: ...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 T...

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