Monessen Hearth DIS33

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This is an unvented gas-fired heater.

It uses air (oxygen) from the room

in which it is installed. Provisions for

adequate combustion and ventilation

air must be provided. Refer to page 9.

READ AND SAVE THESE INSTRUCTIONS

WARNINGS

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

neighbor's 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 the gas

supplier.

MODEL: DIS33

Natural Gas or Propane/LPG

Control Type: Milli-Volt, T-Stat, or

Hi/Lo Remote Control

VENT-FREE FIREPLACE SYSTEMS

INSTALLATION AND OPERATING INSTRUCTIONS

WARNINGS

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Summary

General Safety Warnings

Important Safety Information

Safety Guidelines and Precautions

Covers warnings for installation, operation, high temperatures, children, flammables, servicing, and CO poisoning.

Installation Compliance and Restrictions

Details adherence to local codes, installation in bathrooms/bedrooms, and avoiding drafts.

Appliance Usage and Environmental Considerations

Product Features Overview

Fireplace Component Identification

Identifies key parts like face plate, screen, control access door, knobs, ignitor, and blower.

Basic Operation Description

Explains the unvented nature and high heating efficiency of the gas heater.

Gas Specifications and Control Systems

Natural Gas and Propane;LPG Pressure Settings

Details regulator and gas inlet pressure settings for Natural Gas and Propane/LPG.

Ignition and Control System Functions

Explains piezo ignitor, Hi/Lo, Milli-Volt, T-Stat controls, and ODS pilot operation.

Getting Started with Installation

Parts Verification and Required Tools

Lists included parts, optional face plates, and necessary tools for installation.

General Installation Procedures

Screen Removal and Canopy Installation

Instructions for removing the fireplace screen and installing the canopy.

Installation Codes and Air Requirements

Calculating Unconfined Space Air Volume

Clearances and Height Requirements

Sidewall, Ceiling, and Back Wall Clearances

Specifies minimum clearances from combustible surfaces for sidewalls, ceilings, and back walls.

Floor and Mantel Clearance Guidelines

Details floor requirements and initial mantel clearance overview.

Detailed Mantel Clearance Specifications

Combustible Flooring Clearance Details

Fireplace Framing Instructions

Securing the Heater to the Floor

Gas Connection Procedures

Gas Line Access and Shutoff Valve

Checking Gas Pressure

Manual Control Pressure Test

Explains how to check gas pressure at the test point for manual control systems.

Hi;Lo and Millivolt Control Pressure Test

Details gas pressure checking procedures for Hi/Lo and Millivolt control types.

Milli-Volt Electrical Wiring

Connecting Wall Switch or Thermostat

Instructions for wiring optional wall switches and thermostats to the milli-volt system.

Remote Receiver Installation and System Checks

Fan Electrical Wiring Diagram

Log Placement Instructions

Installing Logs on the Grate

Step-by-step guide for correctly positioning the ceramic fiber logs on the grate.

Decorative Rock Placement Warning

Advises on correct placement of decorative rock to prevent sooting and describes initial operation smells.

Flame Appearance Checks

Pilot Flame Correctness

Illustrates correct and incorrect pilot flame appearances for various control types.

Burner Flame Appearance

Normal Burner Flame and Operation Notes

Describes correct rear flame appearance, glowing embers, and operation notes.

Operating Instructions - Before Lighting

Pre-Lighting Safety Checks

Emphasizes reading safety information, smelling for gas, and safe handling of control knobs.

Smelling Gas Procedures

Provides critical steps to follow if a gas odor is detected in the vicinity of the appliance.

Hi;Lo Control Lighting Instructions

Milli-Volt;Thermostat Control Lighting

Blower Operation and Match Lighting

Match Lighting Procedure

Instructions for lighting the pilot using a match if the piezo ignitor fails.

Blower Control and Functionality

Explains how to locate and operate the blower control, including thermostat settings.

Cleaning and Servicing Guide

Periodic Cleaning Recommendations

Outlines regular cleaning tasks for logs, burners, and air intake holes.

Annual Cleaning and Inspection Checklist

Lists annual inspection items like burner ports, ODS pilot, and flame pattern verification.

Troubleshooting Common Issues

Troubleshooting Flame and Odor Problems

Illustrated Parts Breakdown

Replacement Parts List

Limited Lifetime Warranty Policy

Warranty Coverage and Exclusions

Details warranty periods for different components and conditions for voiding the warranty.