Laars Mighty Therm HH 500

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FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,

qualified in hot water boiler installation and maintenance. Improper installation and/or operation could

create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.

Improper installation and/or operation will void the warranty.

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 or use gasoline or other flammable vapors and liquids in the vicinity of this or

any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any phone in your building.

• Immediately call your gas supplier from a nearby phone. Follow the gas supplier's

instructions.

• If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service agency, or gas

supplier.

H0117400E

Installation and Operation

Instructions for

Mighty Therm

Hydronic Boilers

Models HH and PH

Sizes 500-1825

These instructions are to be stored in the pocket provided on the boiler

Installation and Operation Instructions Document 1049E

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Summary

General Information

Introduction

Overview of the manual's purpose and recommendations for installation and operation.

Boiler Identification

Guide to understanding the boiler model, input rate, gas type, and firing modes.

Flow Requirements

Specifies minimum flow rates and temperature rise for optimal boiler performance and lifespan.

Variable Water Flow Systems

Details requirements for systems with fluctuating water flow, recommending primary-secondary pumping.

Warning Regarding Chilled Water Systems

Crucial safety warning about preventing chilled water entry to prevent condensation and damage.

Freeze Protection

Recommended methods and adjustments for protecting the boiler from freezing temperatures.

Installation

Boiler Placement

Guidelines for selecting a suitable location, ensuring proper clearances and mounting.

Installation of Indoor Boilers

Procedures for installing boilers indoors, including combustion air and venting.

Installation of Outdoor Boilers

Procedures for installing boilers outdoors, considering location and environmental factors.

Gas Supply and Piping

Instructions for connecting the gas supply, including pipe sizing and trap installation.

Electrical Wiring

Guidance on electrical grounding and wiring connections according to safety codes.

Water Piping of System

Instructions for connecting water piping, including isolation valves and pressure relief.

Filling Fully-Connected System

Detailed steps for filling the system with water, bleeding air, and checking pressure.

Operation

Controls - General

Explanation of electronic ignition, operating controls, and high limit switches.

Initial Start-Up

Step-by-step guide for safely lighting the pilot and performing initial checks before operation.

To Start Up System

Procedures for starting the boiler and system, including setting temperature controls.

To Turn Off Boiler

Steps to safely turn off the boiler's main power and gas supply.

To Shut Down System

Procedures for shutting down the entire system, including water supply for freeze protection.

Maintenance

Troubleshooting and Analysis of Service Problems

Parts Descriptions and Order Numbers

Outdoor Parts Descriptions and Order Numbers

Optional Parts Descriptions and Order Numbers