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HTP ELU Series - User Manual

HTP ELU Series
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NOTICE
The manufacturer reserves the right to make product changes or updates without notice and will not be held liable for
typographical errors in literature.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
272 Duchaine Blvd. New Bedford, MA 02745 www.htproducts.com
Improper installation, adjustment, alteration, service, or maintenance could void product warranty and cause property
damage, severe personal injury, or death.
WARNING
!
IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT, CAUSING
PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE. DO NOT STORE GASOLINE OR OTHER FLAMMABLE VAPORS
AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER BOILER.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any boiler.
Do not touch any electrical switch.
Do not use any phone in your building.
Immediately call your gas supplier from a neighbor’s phone. Follow the gas suppliers instructions.
If you cannot reach your gas supplier, call the re department. Installation and service must be provided by a qualied
installer, service agency, or the gas supplier.
ELU and EFTU
High Eciency Condensing
Wall-Hung Gas Boilers
User’s Information Manual
The surfaces of these products contacted by potable (consumable) water contain less than 0.25% lead by weight as required
by the Safe Drinking Water Act, Section 1417.
California Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer, birth
defects, or other reproductive harm.
Heat Exchanger Bears the ASME “H” Stamp
420010970100 - LP-699 Rev. 000 Rel. 001 Date 6.11.20

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Questions and Answers

  • R
    Robert DelgadoAug 12, 2025
    How to resolve a configuration conflict in my HTP ELU?
    • P
      Pamela RomanAug 12, 2025
      If you are experiencing a configuration conflict with your HTP Boiler, it means that each boiler connected to the BUS must have a unique address (parameter 0.4.6), and no boiler can be configured as «b-SIN». To resolve this: 1. Press OK, then choose and correct the boiler address. Press OK again. 2. If the above doesn't work, go to parameter 0.4.6 and set the correct boiler address.
  • B
    Brandon AllenAug 16, 2025
    What to do if my HTP ELU Boiler shows a Follower Boiler Missing from BUS Connection error?
    • A
      Angela TurnerAug 16, 2025
      If the Follower Boiler is missing from the BUS connection, press the Reset button to clear the error code. If the error persists, check the BUS wiring to ensure it is intact and properly connected. Repair if necessary.
  • A
    alexistylerAug 19, 2025
    How to configure the address on my HTP ELU Boiler?
    • C
      Christopher ParksSep 12, 2025
      If your HTP Boiler address is unconfigured, it means the boiler address is undefined (0.4.6 = UNDEF). To fix this: 1. Press OK, then choose and correct the boiler address. Press OK again. 2. If the above doesn't work, access parameter 0.4.6 and set the correct boiler address.
  • S
    Sharon FieldsAug 23, 2025
    How to fix a system sensor open short circuit on my HTP ELU?
    • D
      danielburtonAug 23, 2025
      To address a System Sensor Open Short Circuit in your HTP Boiler: 1. Connect the System Sensor to the Master boiler SYS terminal. 2. Check the cable between the System Sensor and the Master boiler. 3. Ensure that the System Sensor is a 10k Ohm NTC. 4. Replace the System Sensor. If the problem continues, replace the main control.
  • M
    Michael ConradAug 27, 2025
    What to do if my HTP ELU Boiler burner does not ignite?
    • A
      Ashley HardinAug 27, 2025
      If the burner on your HTP Boiler does not ignite, first ensure that the boiler is turned ON and is supplied with and full of water. Make sure the water inlet, outlet, and gas supply line valves are open and that the water lines are not frozen. If the control panel display is blank, ensure the power cord is intact and plugged in, and check the circuit breaker or fuse box. If problems persist, contact the electric utility.
  • K
    Kim WatersAug 31, 2025
    What to do if water is too hot or not hot enough in HTP ELU?
    • C
      Chad LewisAug 31, 2025
      If the water is too hot or not hot enough in your HTP Boiler (combi models or systems with indirect water heaters), adjust the temperature setting on the boiler or indirect water heater. Also, make sure the water inlet and outlet valves are open.
  • K
    kerri62Sep 3, 2025
    Why does the blower continue to operate after combustion stops in my HTP ELU Boiler?
    • O
      obrienkaylaSep 3, 2025
      It is normal for the blower to continue operating after combustion has stopped in your HTP Boiler. The blower operates after combustion has stopped to vent the remaining exhaust gas from the flue.
  • Y
    ybrownSep 7, 2025
    Why is there white 'smoke' coming out of the exhaust vent of my HTP Boiler?
    • S
      Shelly VargasSep 7, 2025
      It is normal to see white 'smoke' coming out of the exhaust vent of your HTP Boiler. Depending on the outdoor temperature, water vapor can be produced as the exhaust is vented.

Summary

Critical Safety Warnings and Gas Handling

Fire and Explosion Hazard Information

Highlights risks of fire/explosion from not following instructions, and avoiding flammable liquids.

Gas Leak Emergency Procedure

Provides critical steps to follow if gas is detected, including contacting gas supplier.

Operational Safety and Startup Procedures

Combustion Chamber Insulation Hazard

Warning about ceramic fiber material and avoiding opening the combustion chamber.

Understanding Hazard Symbols and General Safety

Flammable Vapors Hazard

Details explosion risk from flammable liquids and proper storage.

Scalding Hazard from Hot Water

Warns about severe burns from hot water over 125°F.

Pre-Operation Checks and Environmental Safety

Flammable Material and Air Intake Restrictions

Warning against storing flammables and blocking air intake/exhaust vents.

Combustion Air Contamination Risks

Identifying hazardous contaminants that can damage the boiler and cause injury.

User Troubleshooting Guide

HTP ELU Series Specifications

General IconGeneral
Boiler TypeCondensing
Heat Exchanger MaterialStainless Steel
Fuel TypeNatural Gas
EfficiencyUp to 95%
Ignition TypeElectronic Ignition
Control SystemDigital
VentingPVC

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