Lennox DT3025

Litho USA
Page 1
This appliance may be installed in an aftermarket
permanentlylocated,manufactured(mobile)home,
wherenot prohibitedbylocalcodes.Thisappliance
is only for use with the type of gas indicated on the
rating plate. This appliance is not convertible for
use with other gases, unless a certified kit is used.
DR4035 FLUSH-FACED MODEL SHOWN

E 2001 Lennox Industries Inc.
Dallas, Texas
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
INSTALLATION
INSTRUCTIONS
DT/DTH/DR/DRH
MERITt
Series
DIRECT VENT
VENTED GAS FIREPLACE/
VENTED GAS FIREPLACE HEATER
850,010M
05/2001
Supersedes 504,023M 11/99
Table of Contents
DT/DTH/DR/DRH Unit Dimensions 2..................
Merit t Series DT/DTH/DR/DRH 2....................
Shipping and Packing List 3..........................
Requirements 3....................................
General 3.........................................
Combustion Air 4...................................
Location Selection 4................................
Installation Clearances 5............................
Framing 6.........................................
Installation 6......................................
Venting 12.........................................
Gas Piping 21......................................
Unit Start-up 21....................................
Adjustments 23.....................................
Service 24.........................................
Wiring Diagram - Millivolt Gas Valves 24...............
Wiring Diagram - Electronic Gas Valves 25.............
Repair Parts List 25.................................
Venting Kits & Available Components 26...............
WHAT TO DO IF YOU SMELL GAS:
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.
WARNING
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
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.
Extinguish any open flames.
FORYOURSAFETY
WH Report No. J20046561

Lennox DT3025 Specifications

General

Category	Indoor Fireplace
Type	Direct Vent
Fuel Type	Natural Gas or Propane
Ignition	Electronic Ignition
Venting	Direct Vent

Summary

Shipping, Requirements, and Safety

General Safety and Code Compliance

Highlights critical safety warnings and adherence to national and local building codes.

Installation Clearances

Clearances to Combustibles

Specifies minimum safe distances from the appliance to combustible materials.

Framing and Installation

Installation Steps

Installation Safety Precautions

Emphasizes safety measures to follow during the installation process.

Venting System Guidelines

General Venting Requirements

Sealing Vent Pipe Connections

Details the correct methods and materials for sealing all vent pipe joints securely.

Venting Safety

Highlights critical safety information related to vent system installation and potential hazards.

Vertical Venting

Vertical Venting Through Roof

Provides instructions and diagrams for routing vent pipes vertically through the roof.

Vent Termination Heights and Horizontal Venting

Termination Heights Above Roofs

Horizontal Venting Through Side Wall

Provides guidance for routing vent pipes horizontally through a side wall.

Horizontal Venting Guidelines

Horizontal Vent Terminations

Exterior Horizontal Vent Termination Clearances

Clearance Requirements

Lists all required clearances for horizontal vent terminations from building features and property lines.

Gas Piping and Start-up

Gas Piping Installation

Provides instructions and safety guidelines for connecting the gas supply to the appliance.

Unit Start-up Procedures

Guides users through the initial start-up process for the fireplace, including safety checks.

Fireplace Operation

Millivolt Valve Operation

Details the step-by-step procedure for lighting and operating fireplaces with millivolt gas valves.

Electronic Gas Valve Operation

Details the step-by-step procedure for operating fireplaces with electronic gas valves.

Adjustments and Troubleshooting

Pilot Flame Adjustment

Failure to Operate Checklist

Lists common checks to perform if the fireplace unit fails to operate correctly.

Service and Diagrams

General Service Procedures

Millivolt Gas Valve Wiring Diagram

Presents the wiring schematic for millivolt gas valve systems.

Electronic Gas Valve Wiring and Parts

Electronic Gas Valve Wiring Diagram

Presents the wiring schematic for electronic ignition gas valve systems.