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Read this section carefully. Improper installation,
adjustment, operation or maintenance constitutes a
serious health and safety hazard.
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Material Specifications . . . . . . . . . . . . . . . . . . . . . . . . .2
Heater Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .2
Venting Specifications . . . . . . . . . . . . . . . . . . . . . . . . .2
Suspension Specifications . . . . . . . . . . . . . . . . . . . . . .2
Controls Specifications . . . . . . . . . . . . . . . . . . . . . . . . .2
Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . .3
Burner Specification . . . . . . . . . . . . . . . . . . . . . . . . . . .4
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Health and Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Clearances To Combustibles . . . . . . . . . . . . . . . . . . . .5
Initial Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Final Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Heater Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Model BH15UT U-Tube Assembly . . . . . . . . . . . . . . . . .7
Model BH20UT/BH25UT U-Tube Assembly . . . . . . . . . .8
Model BH30UT/BH35UT/BH40UT U-Tube Assembly . .9
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Health and Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Clearances To Combustibles . . . . . . . . . . . . . . . . . . .10
Initial Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Final Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Heater Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Model BH15ST Assembly . . . . . . . . . . . . . . . . . . . . . .12
Model BH20ST/BH25ST Assembly . . . . . . . . . . . . . . .13
Model BH30ST/BH35ST/BH40ST Assembly . . . . . . .14
Model BH45ST/BH50ST Assembly . . . . . . . . . . . . . . .15
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Health and Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Clearances To Combustibles . . . . . . . . . . . . . . . . . . .16
Initial Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Final Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Heater Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Typical Installation Layout . . . . . . . . . . . . . . . . . . . . .18
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Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Electric Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
External Wiring Diagram (Single Burner) . . . . . . . . . .20
External Wiring Diagram (Double Linear Burner) . . . .20
Internal Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . .21
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General Requirements . . . . . . . . . . . . . . . . . . . . . . . .22
Flue Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Flueless Installation . . . . . . . . . . . . . . . . . . . . . . . . . .22
Ventilation Requirements . . . . . . . . . . . . . . . . . . . . . .22
Air Supply to Burner . . . . . . . . . . . . . . . . . . . . . . . . . .22
Air Supply Requirements . . . . . . . . . . . . . . . . . . . . . . .23
Common Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
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Detailed Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
System Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
User Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
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Annual Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Component Removal . . . . . . . . . . . . . . . . . . . . . . . . . .25
Troubleshooting Flow Chart . . . . . . . . . . . . . . . . . . . .28
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Gas Conversion Kits . . . . . . . . . . . . . . . . . . . . . . . . . .26
Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Conversion Procedure . . . . . . . . . . . . . . . . . . . . . . . .26
Adjustment of Step-Flow Rate . . . . . . . . . . . . . . . . . .26
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1. Blackheat U-Tube and Linear Tube Configurations . . . .4
2. Bracket Suspension . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3. Model BH15UT U-Tube Assembly . . . . . . . . . . . . . . . . .7
4. Model BH20UT/BH25UT U-Tube Assembly . . . . . . . . .8
5. Model BH30UT/BH35UT/ BH40UT U-Tube Assy . . . . . .9
6. Tube Clamp Package . . . . . . . . . . . . . . . . . . . . . . . . .10
7. Coupling Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .10
8. Reflector Support Strap . . . . . . . . . . . . . . . . . . . . . . .11
9. Model BH15ST Assembly . . . . . . . . . . . . . . . . . . . . . .12
10. Model BH20ST/BH25ST Assembly . . . . . . . . . . . . . .13
11. Model BH30ST/BH35ST/ BH40ST Assembly . . . . . .14
12. Model BH40ST/BH50ST Assembly . . . . . . . . . . . . . .15
13. Typical Installation Layout (Dbl. Linear) . . . . . . . . . . .18
14. Typical Gas Line Installation . . . . . . . . . . . . . . . . . . .19
15. Typical External Wiring (Single Burner) . . . . . . . . . . .20
16. Typical External Wiring (Double Linear) . . . . . . . . . . .20
17. Burner Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . .21
18. Flue Connection Detail . . . . . . . . . . . . . . . . . . . . . . . .22
19. Fresh Air Intake Spigot . . . . . . . . . . . . . . . . . . . . . . . .23
20. Air Supply w/Flue Configurations . . . . . . . . . . . . . . . .23
21. TEKNIGAS Valve Spring Replacement . . . . . . . . . . . .27
22. SIT Valve Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
23. TEKNIGAS Valve Detail . . . . . . . . . . . . . . . . . . . . . . . .27
24. Burner Cup Position . . . . . . . . . . . . . . . . . . . . . . . . . .27
25. Troubleshooting Flow Chart . . . . . . . . . . . . . . . . . . . .28
26. Burner Internal Components . . . . . . . . . . . . . . . . . . .30
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