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HTP EL-220 - User Manual

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120 Braley Rd. P.O. Box 429 East Freetown, MA 02717-0429 www.htproducts.com
LP- 293 REV. 9.2.14
Elite
INSTALLATION
START-UP
MAINTENANCE
PARTS
Models*
EL-80 / 110 / 150 / 220 / 299 / 301 / 399
*A suffix of “LP” denotes propane gas
*A suffix of “N” denotes natural gas
Heat Exchanger Bears the ASME “H” Stamp
NOTICE: HTP 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.
This manual must only be used by a qualified heating installer/service technician. Read all instructions in this manual before installing.
Perform steps in the order given. Failure to comply could result in substantial property damage, severe personal injury, or death.

Table of Contents

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Preview: Installation Start-Up Maintenance Parts
Installation Start-Up Maintenance Parts73 pages

Questions and Answers

  • C
    Christopher Fowler Jr.Sep 8, 2025
    How to troubleshoot Fault Code E03 System Sensor Failure on my HTP EL-220?
    • H
      heather07Sep 9, 2025
      If your HTP Boiler displays Fault Code E03, it means there's a system sensor failure, possibly due to an open or shorted circuit. Here’s how to troubleshoot: Disconnect the system sensor from the wiring and measure its resistance. Compare the measured resistance to the table to see if it corresponds to the sensor's temperature. If the resistance doesn't match, replace the sensor. If the sensor is OK, disconnect the sensor wiring from both the boiler and the sensor, then check continuity using an ohmmeter. Repair or replace the wiring as necessary.
  • C
    Christina YoungAug 23, 2025
    What to do if my HTP EL-220 Boiler shows Fault Code F10?
    • B
      bcoxAug 23, 2025
      If your HTP Boiler displays fault code F10, it indicates the flame was lost three times during one demand call. To address this: 1. Monitor the gas pressure to the boiler during operation. 2. Make sure the flame remains stable once lit. 3. Confirm the display changes from “GAS VALVE ON” to “RUN” shortly after ignition. 4. Check the FLAME signal on the status display; it should exceed 1.0 when firing. 5. If the signal is below 1 microampere, clean the flame rectifier and spark probe. 6. If the issue continues and the ‘FLAME’ signal remains below 1.0, replace the flame probe and spark igniter probe. 7. A stable flame signal should read 5.0 to 9.0 after a minute of firing. If unsteady, inspect the burner and its sealing gaskets.
  • Q
    qbauerAug 25, 2025
    What does Fault Code F01 mean on my HTP EL-220 and how do I fix it?
    • J
      Justin GrantAug 26, 2025
      If your HTP Boiler displays fault code F01, it means a safety interlock switch has tripped. Here's how to troubleshoot: 1. Check if an optional UL 353 LWCO is installed. 2. If so, see if the indicator light shows the LWCO has tripped. 3. If tripped, restore the water level and manually reset the switch and boiler. 4. If there are no optional switches, use an ohmmeter to test each standard switch after turning off the boiler and disconnecting the switch to be tested. Find the tripped switch and investigate the cause, considering that temperature switches often trip due to low water flow or poor heat transfer. 5. If no switches are tripped, push RESET on the boiler. If the F01 code returns after a short run, check the flue for blockage.
  • P
    Pamela ThompsonAug 26, 2025
    How to fix Fault Code FLU on my HTP EL-220?
    • P
      Phillip EvansAug 27, 2025
      If your HTP Boiler is showing Fault Code FLU, it means there's excessive flue pressure. Here's how to address it: 1. Make sure that the flue is not blocked. 2. Check the switch wiring by applying a jumper in place of the switch. If the code clears with the jumper in place, replace the flue switch and connect the wires to the new switch before running the boiler.
  • D
    Dana RobinsonAug 27, 2025
    What does Fault Code F00 mean on my HTP EL-220?
    • J
      Joseph RogersAug 27, 2025
      If your HTP Boiler is displaying fault code F00, it indicates the water in the boiler has overheated. Here’s how to address the issue: 1. Verify the circulator pump is functioning correctly. 2. If the pump is running, ensure there is water in the system and it's circulating properly. Check that all ball valves and zone valves are correctly opened or closed. 3. Observe the temperature/pressure gauge. If the water isn't excessively hot but the message appears, inspect the wiring to the water ECO sensor and repair if needed. If the wiring is fine and the code persists without overheating, replace the ECO sensor.
  • M
    Michael McbrideNov 28, 2025
    What does Fault Code F11 on my HTP Boiler mean?
    • T
      tyler74Dec 1, 2025
      If your HTP Boiler displays fault code F11, it indicates there's flame present when the control isn't calling for the boiler to run. Here's what to do: 1. Check for a flame through the window. If a flame is present, turn off the gas supply to the boiler at the service valve and replace the gas valve. 2. If the flame signal on the status menu is greater than 1.0 when the burner is off, replace the spark igniter and the flame rectification probe. 3. If the flame return sensor is not present after turning off the gas supply, check the gas valve electrical connection. 4. Repair the condensate system as needed. If condensate has backed up and partially filled the combustion chamber, the refractory wall may be damaged and should be replaced. 5. After taking corrective action, turn the gas ...
  • G
    Gary HouseSep 18, 2025
    What does Fault Code F31 mean on my HTP EL-220 Boiler?
    • C
      Charlene KingSep 18, 2025
      If your HTP Boiler displays fault code F31, it indicates there was an error while programming the control, and the memory is corrupt. The control must be re-programmed. If programming does not solve the problem, the control must be replaced.
  • C
    Christina JacobsSep 23, 2025
    What does Blocking Code E19 mean on my HTP EL-220 Boiler?
    • L
      Lauren BrownSep 23, 2025
      If your HTP Boiler displays Blocking Code E19, it means the line voltage frequency is out of range. Inspect the power wiring to the boiler and repair as necessary. If connected to line voltage, notify the power company. If connected to an alternate power source such as a generator or inverter, make sure the line voltage frequency supplied by the device is 60 Hz.
  • A
    Alex MillerSep 7, 2025
    What to do if my HTP EL-220 displays Fault Code PRO?
    • S
      stephenspeggySep 7, 2025
      If your HTP Boiler is showing Fault Code PRO, it indicates low water pressure in the boiler. To resolve this: 1. Make sure the system pressure is above 10 psig. 2. Check for leaks in the system piping.
  • A
    Adrian BentonSep 4, 2025
    What does Fault Code F13 mean on my HTP Boiler?
    • K
      kimrobinsonSep 4, 2025
      If your HTP Boiler displays fault code F13, it indicates the fan isn't running at the commanded speed. Here's how to troubleshoot: 1. Check the combustion air fan wiring. 2. Measure the DC voltage from the red fan wire to ground while connected to the fan; it should be between 24 to 40 volts. If lower than 24 volts, check for excessive external loads on the boiler sensor terminals. Disconnect the 5-pin plug from the fan and check the voltage on the red wire again. If it's now between 24-40 volts, replace the fan. If it remains below 24 volts, replace the boiler control board.

Summary

PART 1 - GENERAL SAFETY INFORMATION

A. PRECAUTIONS

Essential safety precautions for installation and operation of the boiler.

B. IMPROPER COMBUSTION

Hazards and safety measures related to improper combustion processes.

C. GAS

Safety advice regarding gas supply and handling procedures.

D. WHEN SERVICING THE BOILER

Key safety precautions to follow during boiler maintenance.

E. BOILER WATER

Important considerations for boiler water quality and system maintenance.

F. BOILER WATER CHEMISTRY*

Guidelines for maintaining optimal boiler water chemistry for system efficiency.

G. FREEZE PROTECTION FLUIDS

Proper use and selection of freeze protection fluids for hydronic systems.

PART 2 - BEFORE YOU START

A. WHATS IN THE BOX

List of all components and parts included with the boiler package.

B. HOW BOILER OPERATES

Explanation of the boiler's features and fundamental operational principles.

C. OPTIONAL EQUIPMENT

Overview of available optional accessories to enhance boiler functionality.

PART 3 - PREPARE BOILER LOCATION

A. BEFORE LOCATING THE BOILER

Key considerations and requirements before selecting the boiler's installation site.

B. LEVELING AND DIMENSIONS

Instructions and specifications for proper boiler leveling and dimensional placement.

C. CLEARANCES FOR SERVICE ACCESS

Minimum required clearances around the boiler for safe servicing and access.

D. RESIDENTIAL GARAGE INSTALLATION

Specific safety precautions for installing the boiler in a residential garage.

E. EXHAUST VENT AND INTAKE PIPE

Guidelines for the correct installation of the exhaust vent and intake pipe.

PART 4 - BOILER PIPING

A. GENERAL PIPING INFORMATION

General advice and essential requirements for boiler system piping.

B. RELIEF VALVE

Proper installation and connection procedures for the pressure relief valve.

C. BACKFLOW PREVENTER

Requirements for installing a backflow preventer on the cold water supply line.

D. SYSTEM WATER PIPING METHODS

Various methods for connecting the boiler to the hydronic heating system.

E. CIRCULATORS

Guidance on selecting and properly installing circulator pumps.

F. HYDRONIC PIPING WITH CIRCULATORS, ZONE VALVES, AND MULTIPLE BOILERS

Advanced piping configurations for complex hydronic systems.

G. PIPING DETAILS*

Detailed diagrams and specifications for various piping installations.

H. PIPING INSTALLATION

Step-by-step instructions for the correct installation of boiler piping.

I. CIRCULATOR SIZING

Methodology for accurately sizing circulator pumps for the system.

PART 5 - VENTING, COMBUSTION AIR, AND CONDENSATE REMOVAL

A. GENERAL

General requirements for venting and combustion air for safe operation.

B. APPROVED MATERIALS FOR EXHAUST VENT AND INTAKE PIPE

List of approved materials for exhaust vent and intake pipe installations.

C. REQUIREMENTS FOR INSTALLATION IN CANADA

Specific installation requirements and standards applicable in Canada.

D. EXHAUST VENT AND INTAKE PIPE LOCATION

Guidelines for the proper placement of vent and intake terminals.

E. EXHAUST VENT AND INTAKE PIPE SIZING

Instructions on how to correctly size exhaust vent and intake pipes.

F. LONGER VENT RUNS

Considerations for extending vent pipe lengths beyond standard limits.

G. EXHAUST VENT AND INTAKE PIPE INSTALLATION

Detailed steps for the correct installation of vent and intake piping.

H. VENTING DRAWINGS

Visual guides illustrating various approved venting configurations.

PART 6 - GAS PIPING

A. GAS CONNECTION

Procedures for safely connecting the gas supply to the boiler.

B. GAS PIPING

Guidelines for sizing and installing natural gas or propane piping.

C. CHECK INLET GAS PRESSURE

How to measure and verify the inlet gas pressure to the unit.

D. BOILER GAS VALVE

Information and precautions related to the boiler's gas valve operation.

PART 7 - FIELD WIRING

A. INSTALLATION MUST COMPLY WITH:

Codes and regulations that must be followed for all wiring installations.

B. FIELD WIRING TERMINATIONS

Location and method for making field wiring connections inside the unit.

C. FIELD WIRING

General instructions and guidelines for field wiring the boiler.

D. LINE VOLTAGE WIRING FOR STANDARD BOILER

Wiring instructions for the boiler's main 120V power supply connection.

E. ALARM CONNECTIONS

How to connect an external alarm system to the boiler's control.

F. LOW VOLTAGE CONNECTIONS FOR STANDARD BOILER

Connecting low voltage field devices to the boiler's terminal strip.

G. THERMOSTAT

Installation and connection procedures for the room thermostat.

H. OUTDOOR SENSOR

Installation of the outdoor sensor for temperature compensation.

I. INDIRECT SENSOR

Connecting the sensor for indirect water heater temperature control.

J. OPTIONAL 0-10 VOLT BUILDING CONTROL SIGNAL

Connecting a building management system signal for remote control.

K. OPTIONAL UL353 LOW WATER CUT-OFF INTERFACE KIT

Installation instructions for the optional low water cut-off interface kit.

L. WIRING OF CASCADE SYSTEM COMMUNICATION BUS

Connecting multiple boilers in a cascade system via communication bus.

M. CASCADE MASTER PUMP AND SENSOR WIRING

Wiring for the master boiler's system pump and sensor connections.

N. CASCADE FOLLOWER PUMP AND SENSOR WIRING

Wiring for follower boilers' system pumps and sensor connections.

PART 8 - START-UP PREPARATION

A. CHECK;CONTROL WATER CHEMISTRY

Verifying and adjusting water chemistry prior to boiler startup.

B. CHECK FOR GAS LEAKS

Procedures for detecting and fixing any gas leaks in the system.

C. FREEZE PROTECTION (WHEN USED)

Guidelines for the correct use and selection of freeze protection fluids.

D. FILL AND TEST WATER SYSTEM

Steps for filling and testing the boiler's water system before operation.

E. PURGE AIR FROM WATER SYSTEM

How to properly remove air from the heating system.

F. CHECK THERMOSTAT CIRCUIT(S)

Verifying thermostat and external circuit wiring integrity.

G. CONDENSATE REMOVAL

Proper setup and maintenance of the boiler's condensate removal system.

H. FINAL CHECKS BEFORE STARTING BOILER

Performing essential final checks before initiating boiler operation.

I. CASCADE SYSTEM

Configuration steps for setting up a multi-boiler cascade system.

J. LOCKOUT CONDITION

Understanding and managing boiler lockout conditions for safety.

PART 9 - START-UP PROCEDURE

A. CONTROL OVERVIEW

Introduction to the boiler's control system and its primary functions.

B. NAVIGATION OF THE DISPLAY

How to navigate and use the boiler's digital control display interface.

C. OPERATING INSTRUCTIONS

Step-by-step guide for initial boiler operation and startup.

D. PROGRAMMING BOILER SETTINGS

How to access and adjust the boiler's configuration settings.

E. PROGRAMMING THE SYSTEM SETTING

Steps for programming system-specific parameters and settings.

F. SYSTEM SETTING PROGRAM NAVIGATION

Navigating through the system settings menu for configuration.

G. RESETTING THE MAINTENANCE SCHEDULE

Procedure to reset the maintenance reminder schedule after service.

PART 10 - START-UP PROCEDURES FOR THE INSTALLER

A. BOILER CONTROL STATUS MENU

Reviewing the boiler's operational status via the control menu.

B. CASCADE MENU

Accessing and understanding the cascade system menu options.

C. BOILER TEST MODE ACCESS

How to enter and use the boiler's test mode for adjustments.

PART 11 - TROUBLESHOOTING

A. BOILER ERROR CODE

Understanding boiler error messages and associated error codes.

B. BOILER ERROR

Interpreting general boiler error messages for diagnosis.

C. BOILER FAULT

Identifying and responding to boiler fault conditions and alerts.

D. USER INTERFACE DISPLAY

Troubleshooting common faults indicated on the user interface display.

PART 12 - MAINTENANCE

A. MAINTENANCE PROCEDURES

General procedures for performing periodic boiler maintenance.

B. COMBUSTION CHAMBER COIL CLEANING INSTRUCTIONS FOR BOILER

Step-by-step guide for cleaning the combustion chamber and coils.

C. CLEANING WATER SIDE OF HEAT EXCHANGER

Process for cleaning the heat exchanger's water side to ensure efficiency.

D. MAINTAINING THE CONDENSATE SYSTEM

Steps for maintaining the boiler's condensate removal system.

ADDITIONAL INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS

1. INSTALLATION OF CARBON MONOXIDE DETECTORS

Requirements for installing CO detectors in Massachusetts installations.

2. APPROVED CARBON MONOXIDE DETECTORS

Specifications for approved carbon monoxide detectors.

3. SIGNAGE

Requirements for warning signage related to gas vent terminals.

4. INSPECTION

Requirements for inspection by state or local gas inspectors.

HTP EL-220 Specifications

General IconGeneral
BrandHTP
ModelEL-220
CategoryBoiler
Heating Capacity220, 000 BTU/hr
Efficiency85%
Fuel TypeNatural Gas
Dimensions24"

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