HTP EFTC-140F - User Manual

Questions and Answers

W
William BentleyAug 12, 2025
What to do if HTP EFTC-140F Boiler water pipes freeze?
- S
  Sarah JonesAug 12, 2025
  If the water pipes freeze, thaw them using a hair dryer or another electric heating device. If this method is unsuccessful, contact a qualified service technician for assistance. Failure to provide freeze protection could result in substantial property damage due to burst pipes, personal injury, or death.
M
Mr. Eric HensleyAug 27, 2025
What happens if I touch the exhaust vent pipe on my HTP EFTC-140F?
- M
  Mitchell PowersAug 27, 2025
  Do not touch the exhaust vent pipe, as doing so could result in substantial personal injury.
J
Jennifer BallSep 3, 2025
Why should I only use my HTP Boiler as intended?
- D
  David CookSep 3, 2025
  Do not use this appliance for any purposes other than those specifically described by HTP, Inc (to provide central heating and domestic hot water). Using the appliance for unapproved purposes will void the warranty and could result in property damage, serious personal injury, or death.
J
Jennifer FrancisSep 10, 2025
What happens if I disassemble my HTP EFTC-140F Boiler?
- W
  wilkersonangelaSep 12, 2025
  Do not attempt to disassemble this appliance. Disassembly could lead to improper operation, premature failure, substantial property damage, and/or severe personal injury or death due to electric shock, fire, or explosion. If repairs are needed, contact a qualified service technician.

This document is a user's information manual for the HTP Elite Fire Tube Combi, available in both Floor and Wall Mount Models. The models covered are EFTC-140F/199F (Floor) and EFTC-140W/199W (Wall).

Function Description:

The HTP Elite Fire Tube Combi appliance is designed to provide both central heating (CH) and domestic hot water (DHW). It is equipped with an automatic ignition device, eliminating the need for a pilot light. The system is designed for high efficiency and reliability, offering a dual function for residential or commercial applications requiring both space heating and on-demand hot water. The appliance is certified by Intertek (cETLus listed), ENERGY STAR, Lead Free (SDWA Section 1417), and features Ultra Low NOx Emissions, complying with SCAQMD Rule 1146.2.

Important Technical Specifications:

Models: EFTC-140F, EFTC-199F, EFTC-140W, EFTC-199W.
Power Supply: 120V 60Hz.
Gas Type: Available for Natural Gas (NG) or Liquid Propane (LP). The specific gas type is indicated on the rating plate.
Ignition: Automatic ignition device; no pilot light.
Water Temperature: Capable of producing hot water over 125°F (52°C).
Pressure Ranges:
- Normal CH loop pressure: 15 – 30 psi.
- Normal DHW loop pressure: 20 – 150 psi.
- Appliance will not operate if pressure is lower than 15 psi.
Safety Features:
- Overheating prevention device: Factory installed limit control for appliance shutdown if water temperature exceeds set point.
- Blocked vent shutoff system: Triggers error codes Er:20, Er:29, or Er:41 if vent is obstructed.
- Carbon Monoxide (CO) detection recommendation: Installation of CO detectors outside sleeping areas is advised.
- Lead-Free certification: Complies with Safe Drinking Water Act (SDWA) Section 1417.
- Ultra Low NOx Emissions: Complies with SCAQMD Rule 1146.2.

Usage Features:

Operation:
1. Start-up: Ensure thermostat is set to lowest, all electric power is off, and front cover is removed. Turn gas shutoff valve to "off" (handle across piping). Wait 5 minutes. If no gas smell, turn gas shutoff valve to "on" (handle in line with piping). Install front cover. Turn on electric power. Set thermostat to desired setting.
2. Shutdown: Set thermostat to lowest, turn off electric power, remove front cover, turn gas shutoff valve to "off" (handle across piping), and install front cover.
3. Gas Type Verification: Before first operation, confirm the connected gas type (NG or LP) matches the appliance's rating plate.
4. Power Connection: Ensure proper 120V 60Hz power supply.
5. Water Supply: Verify cold water inlet valve for DHW loop is open and providing proper pressure. Ensure automatic feed valve for CH loop is providing proper pressure.
6. Gas Supply: Confirm manual gas shut-off valve is open.
7. Ventilation: Ensure fresh air intake pipe and exhaust vents are open and functional. Do not obstruct.
8. Error Codes: The Er:80 code indicates no water in the appliance. Ensure the appliance is full of water and air purged, then manually reset. Other error codes (Er:20, Er:29, Er:41) relate to blocked vent shutoff.
Safety Precautions:
- Gas Leaks: If gas is smelled, do not light appliances, touch electrical switches, or use phones. Call gas supplier from a neighbor's phone or fire department. Regularly check gas pipes and connections with soapy solution for bubbles.
- Flammable Materials: Do not store combustibles or flammable liquids (gasoline, solvents, adhesives) near the appliance. Vapors are invisible, heavier than air, travel along the floor, and can be ignited by the burner or pilot flame.
- Combustion Air Contaminants: Do not operate if combustion air intake is near areas with products containing chlorine or fluorine (e.g., spray cans, cleaning chemicals, refrigerants, paint removers, etc.), as these can form strong acids and corrode the appliance. If contaminants are present, remove them or re-pipe the intake.
- Hot Surfaces: Be cautious of hot internal components, exhaust vent, and water pipes during operation.
- Scalding Hazard: Water temperatures over 125°F can cause severe burns. Children, disabled, and elderly are at highest risk. Feel water before bathing/showering. Temperature limiting valves are available.
- Carbon Monoxide: Improper ventilation or exhaust gas leaks can cause CO poisoning. Shut down appliance, close gas valve, open windows, and call a qualified technician if a leak is suspected.
- Freezing: Insulate exposed water pipes. If not used during freezing conditions, leave zone valves open for circulation pump protection or drain the system. Thaw frozen pipes with a hair dryer or electric heating device, not open flame.
- Water Damage: Ensure proper discharge lines for pressure relief valves to prevent water damage or scalding.
- Unauthorized Repairs: Do not attempt to install, repair, or service the appliance unless qualified. Contact a qualified service technician.

Maintenance Features:

Annual Service (Qualified Service Technician):
- Attend to reported problems.
- Inspect/clean appliance cabinet interior.
- Clean condensate trap and fill with fresh water.
- Check condensate neutralizer (if applicable) for marble chips.
- Check for water, gas, flue, and condensate leaks.
- Verify exhaust vent and intake piping condition, seals, and bracing.
- Check appliance water pressure, piping, and expansion tank.
- Check control settings.
- Check, clean, and reposition ignition electrode.
- Check ignition and ground wiring.
- Check all control wiring and connections.
- Check burner flame pattern.
- Clean heat exchanger and flue ways (if combustion/performance is poor).
- Remove burner assembly and clean burner head with compressed air (if combustion/performance is poor).
- Flushing the appliance heat exchanger and CH/DHW loops (complex procedure, technician only).
Owner Maintenance:
- Daily:
  - Check surrounding area for combustible/flammable materials and air contaminants (refer to Table 1 for list of products and areas). Remove any found.
  - Ensure appliance cabinet is closed and secured.
  - Check power cord connection and main power line.
  - Observe control panel for power status and error codes.
  - Verify exhaust vent and intake pipe terminations are clean and free of obstructions.
- Monthly:
  - Check outdoor exhaust vent and intake pipe terminations for blockages (do not perform if difficult to reach).
  - Check CH and DHW loop pressure gauges (normal CH: 15-30 psi, normal DHW: 20-150 psi).
  - Inspect exhaust vent and intake piping for blockage, leakage, deterioration, and bracing condition.
  - Check pressure relief valve for weeping or leakage.
  - Check condensate drain system for flue gas leaks (indicates dry trap) and condensate neutralizer for marble chips.
- Every 6 Months:
  - Check appliance piping and gas supply piping for corrosion or leakage.
  - Perform gas leak inspection (refer to operating instructions, page 2).
  - Visually inspect for leaks around internal appliance water connections, heat exchanger, external system piping, circulators, components, and fittings.
  - Operate pressure relief valves: Lift lever slightly to allow water to relieve. Ensure valve seats properly and does not weep. If weeping persists, contact a technician. If no water flows, valve or discharge line may be blocked; shut down appliance and call a technician.
Glycol Systems: If glycol is used as heat transfer fluid, it must be serviced periodically by a qualified technician. Glycol can break down, become acidic, and attack gaskets/seals. Do not test glycol quality yourself.