HL Common Parts
Determine Manufacture Date
Date Code Chart
Sample Burner Box Tag
Part Description | HL | HL | HL | HL-2 | HL-2 | HL2 | HL2 | HL2 | HL2 | HL3 | HL3 | HL3 |
01/1994 to 05/04/1995 | 06/2003 to 04/2005 | 09/1995 to 09/2000 | 09/2000 to 08/2002 | 08/2002 to 06/2003 | 06/2003 to 05/2005 | 05/2005 to 08/2014 | 09/2014 to 06/2025 | 07/2025 to Present | 07/2008 to 09/2012 | 10/2012 to 07/2014 | 08/2014 to Present | |
Inducer Fan Blower | TP-55A | TP-55A | TP-55A | TP-55A | TP-55A | TP-55A | TP-55A | TP-55A | TP-55A | TP-55A | TP-55A | TP-55A (50-150 MBH) TP-3215 (175-200 MBH) |
Circuit Board | TP-211A | TP-211A | TP-211A | TP-851 | TP-851 | TP-851 | TP-851 | TP-851 | TP-851B | TP-851B | TP-851B | TP-851B |
Flame Rod | add TP-FRK | add TP-FRK | TP-222 | TP-222 | TP-222 | TP-222 | TP-222 | TP-222 | TP-222 | TP-222 | TP-222 | TP-222 |
Ignition Device | TP-50A | TP-50A | TP-50A | TP-50A | TP-50A | TP-50A | TP-50A | TP-50A | TP-50A | TP-50A | TP-50A | TP-50A |
Gas Valve (Nat) | TP-840A | TP-840A | TP-840A | TP-840A | TP-840A | TP-840A | TP-840A | TP-840A | TP-840A | TP-3140 | TP-3140 | TP-3140 |
Gas Valve (LP) | consult | TP-841A | TP-841A | TP-841A | TP-841A | TP-841A | TP-841A | TP-841A | TP-841A | TP-3141 | TP-3141 | TP-3141 |
Indicator Lights | TP-828 Y | TP-828 Y | TP-828 Y | TP-828 Y TP-827 R | TP-828 Y TP-827 R | TP-828 Y TP-827 R | TP-828 Y TP-827 R | TP-828 Y TP-827 R | TP-828 Y TP-827 R | TP-828 Y TP-1428 G | TP-828 Y TP-1428 G | TP-828 Y TP-1428 G |
Control Voltage | 24V | 24V | 24V | 24V | 24V | 24V | 24V | 24V | 24V | 24V | 24V | 24V |
IOM Link |
Pressure Switch
| Model | Year Range | 50 MBH | 60-75 MBH | 100 MBH | 125 MBH | 150 MBH | 175 MBH | 200 MBH | |
|---|---|---|---|---|---|---|---|---|---|
| HL HL HL HL-2 | 01/1994 to 05/04/1995 05/04/1995 to 09/1995 09/1995 to 09/2000 09/2000 to 08/2002 | Switch 1 N.C. Switch 2 N.O. | TP-264B TP-260F | TP-264B TP-260F | TP-264B TP-260F | TP-264D TP-260F | TP-264D TP-260F | TP-264D TP-260G | TP-264C TP-260G |
| HL-2 HL2 HL2 HL2 HL2 | 08/2002 to 06/2003 06/2003 to 05/2005 05/2005 to 08/2014 09/2014 to 06/2025 07/2025 to Present | TP-264B | TP-264B | TP-264B | TP-264E | TP-264E | TP-264D | TP-264F | |
| HL3 HL3 HL3 | 07/2008 to 09/2012 10/2012 to 07/2014 08/2014 to Present | TP-264D | TP-264D | TP-1264A | TP-1264A | TP-264F | TP-264F | TP-264F |
Note: For heaters with (2) pressure switches, the burner switch in the blower compartment is a normally open switch and the exhaust switch in the gas valve compartment is a normally closed switch
Burner Control Box Parts
-
TP-50A Glo-Bar Hot Surface Igniter
$59.00 -
TP-55A
$200.00 -
TP-222
$25.00 -
TP-828
$10.00 -
TP-264B
$59.00 -
TP-264E
$59.00 -
TP-264D
$59.00 -
TP-851
$230.00 -
TP-851B
$230.00 -
TP-826
$43.00 -
TP-1264A
$59.00 -
TP-264F
$59.00 -
TP-211A
$190.00 -
TP-260F
$59.00 -
TP-3140
$242.00 -
TP-3215
$285.00 -
TP-264C
$59.00 -
TP-260G
$59.00 -
TP-3141
$242.00 -
TP-840A
$230.00 -
TP-827
$15.00 -
TP-841A
$230.00 -
TP-1428
$10.00
Tube and Reflector Components
 | Reflector End Cap Clip - (8) pcs. | |
 | Reflector Center Support | |
 | 4" Wire Hanger with Spring. | |
 | 36 in. Interlocking Turbulator Baffle Section | |
 | Reflector End Cap. 2 pcs (includes attachment clips) | |
 | 4" Tube Clamp | |
 | 4" Stainless Steel Tube Clamp. (1) clamp needed on 150-200 MBH systems. | |
 | Reflector Elbow - 90° bend, with polished, one side bright reflector elbow. | |
 | Elbow - 6” radius, 90° bend, 4” diameter | |
 | Refelctor "U" to cover a TF1B "U" fitting. |
Hanging Hardware
Air Intake
 Guidelines |  Outside Air | |||
Combustion Air Requirements Combustion air may be supplied to the heater by indoor or outdoor means. If using combustion air intake from indoors, the required volume of the space must be a minimum of 50 ft3 per 1,000 BTU/h unless the building is of unusually tight construction. Non-contaminated outside air for combustion must be ducted to the heater if any of the following apply: • Chemicals such as chlorinated or fluorinated hydrocarbons (typical sources are refrigerants, solvents, adhesives, degreasers, paints, paint removers, lubricants, pesticides, etc.). • High humidity. • Contaminants such as sawdust, welding smoke, etc. • Negative building pressure. • Unusually tight construction where there is an air infiltration rate of less the 0.40 air changes per hour. | ||||
 | Wall inlet cap, 4” O.D. with bird screen. For use with outside air option.
Bird screen ensures open air flow to unit. Used for 0-20’ of 4” intake.
Used on all low intensity tube heaters | |
 | 4" Flexible Air Inlet Hose
Used on all low intensity tube heaters
4" flexible air inlet rubber hose (black) with DWV adapter affixed to AIRH. Mates to 4" DWV pipe. Replaces AIB 18" in length.
| |
 | 4" Rooftop Vent Package. Can also be used for Air Intake. |
Venting
 Rooftop |  Sidewall |  Common Rooftop |  Common Sidewall |  Unvented |
General Venting Requirements The venting system for the heating system may terminate horizontally through a sidewall or vertically through the roof, and may be individually or commonly vented. Configuration of the vent termination determines the category type | ||||
Important Model Requirements: | ||||
• Do not exceed a maximum vent length of 20 ft. with two elbows, 25 ft. with one elbow, or 30 ft. with no elbows. • Maintain a minimum vent length of 3 feet. • Maintain a minimum of 12 inches of straight pipe from the flue outlet before any directional changes are made in the venting system. • The equivalent length for a 4 inch 90° elbow is 5 feet. • Avoid using more than two 90° directional changes in the venting system | ||||
 | Galvanized Steel Vent Outlet Cap
Used on all low intensity tube heaters except LS, LD or DBS
4" O.D. with flapper. Flapper ensures proper static pressure for proper unit operation. Must be used with unvented units.
| |
 | 4" Simpson Duravent Rooftop Vent Cap
| |
 | Dual Exhaust Assembly
"Y" shaped, 26 gauge galvanized steel with baffle. 4" O.D. X 4" O.D. For use when common venting (2) units. Heaters MUST share a common thermostat.
Dimensions: 14" left to right (w) x 13" height. | |
 | 4" Duravent Sidewall Vent Kit (Alt. Part# 2C448)
Used on all low intensity tube heaters except LS, LS3, LD3 & DBS
Includes all items for sidewall venting: SWD-4, WT-4, 18BV-4, & DHC-4. Single wall vent pipe material is included. 29" long when fully assembled.
NOT APPROVED FOR V2 200 MBTU/H | |
| 4" Rooftop Vent Package. Can also be used for Air Intake. | |
 | 6" Duravent Sidewall Vent Kit
Al items for sidewall venting including:
SWD-4, WT-6, 18BV-6 and DHC-6. No vent pipe material is included. 30" long when fully assembled.
Used on: all low intensity tube heaters | |
| 6" Rooftop Vent Package.
|
24V Controls
HL3 Field Wiring Diagram
 | 40 VA transformer, 120–24 VAC primary and secondary. Used with ERK to control multiple heaters. | |
 | External Relay Kit for controlling multiple heaters with 24V control. | |
 | 24V Wall Control Switch - HL3 and similar 24V Two Stage heaters. | |
 | Two Stage thermostat. 35°–75°F range. Voltage: 24, 120 VAC | |
 | Single stage or two stage programmable thermostat. 45°–90°F range. 24 VAC | |
 | 4 Hour Timer Control Switch - HL3 and similar 24V Two Stage heaters. | |
 | Two Stage thermostat with rain tight enclosure 40°–100°F range. Can be used with 24–277 VAC. |
Other Information
HL3 Troubleshooting
HL3 Troubleshooting Flowchart
 Section 1 |  Section 2 |
 Section 3 |  Section 4 |
* Older models may have slight variations in troubleshooting. Please consult their respective IOPM’s
Troubleshooting Guide HL Series, HL-2 Series
Clearances 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 the model tube heater and configuration must be maintained. Refer to Chart 1.1
to determine the required distances for your model.
Gas Requirements
Important! Before connecting the gas supply to the burner control box:
• Verify that the heater’s gas type (as listed on the rating plate) matches that of your application.
• Check that the gas piping and service has the capacity to handle the total gas consumption of all heaters
being installed, as well as any other gas appliances being connected to the supply line.
• Check that the main gas supply line is of proper diameter to supply the required fuel pressures.
• If utilizing used pipe, verify that its condition is clean and comparable to a new pipe. Test all gas supply
lines in accordance with local codes.
•Test and confirm that inlet pressures are correct. Refer to the heater rating plate for gas type and the
required minimum and maximum pressures (see Chart 3.8). The gas supply pipe must be of sufficient
size to provide the required capacity and inlet pressure to the heater (if necessary, consult the local gas
company). Do not exceed the maximum allowed pressures for the heater, the space or the gas piping
system.
