Evcon DGAT070BDD - User Manual

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Summary

FINAL PROCEDURE

Install Furnace Doors

Details on installing the bottom and upper furnace doors.

Finish and Trim

Instructions for finishing and trimming alcove and closet installations.

Furnace and Air Conditioner Installations

Guidance for installing furnaces with or without air conditioning units.

MANUFACTURED HOUSING DERATION CHART

PROPANE

Deration chart data for Propane gas by elevation and input BTU.

NATURAL GAS

Deration chart data for Natural Gas by elevation and input BTU.

GENERAL SPECIFICATIONS AND INSTRUCTIONS

INSTALLATION STANDARDS

Comply with Local Codes

Emphasizes adherence to all applicable local codes and regulations for appliance installation.

Minimum Furnace Clearances

Specifies required clearances from combustible material for alcove or closet installations.

High Altitude Installation

Outlines derating procedures for furnaces installed at elevations above 2,000 feet.

RETURN AIR REQUIREMENTS

Closet Installations

Details specific return air opening requirements for furnaces installed in closets.

ROOF JACKS

Locating and Cutting Roof Jack Opening

Guides on correctly positioning and cutting the opening in the ceiling and roof for the roof jack.

Installing Roof Jack in Roof

Provides instructions on securing the roof jack, ensuring alignment and a rain-tight seal.

DLAS SERIES FURNACES

Installation Procedure for DLAS Furnace

Step-by-step guide for installing the DLAS series furnace, including sub-base and duct connector.

DGAT & DGAM SERIES FURNACES

Installation Procedure for DGAT & DGAM Furnaces

Step-by-step guide for installing the DGAT & DGAM series furnaces, without a sub-base.

CONNECTING ROOF JACK TO FURNACE

VENT SYSTEM INSTALLATION INSTRUCTIONS

Existing Furnace Replacement

Procedures for replacing an existing furnace vent system with a new one.

New Home Installation

Guidelines for installing vent systems in new home constructions.

Installation in Snow Regions

Recommendations for vent system extensions in areas with heavy snowfall.

ELECTRICAL WIRING

Connect Power Supply Wires

Details on connecting the 115-volt power supply wires to the furnace.

Connect Thermostat Wires

Instructions for connecting the 24-volt thermostat wires to the furnace control box.

THERMOSTAT WIRING FOR DGAT AND DGAM SERIES

THERMOSTAT WIRING FOR DLAS (HEAT ONLY) SERIES

WIRING DIAGRAMS

DGAT Series Wiring Diagram

Provides the complete electrical wiring diagram for the DGAT series furnace.

DGAM Series Wiring Diagram

Provides the complete electrical wiring diagram for the DGAM series furnace.

GAS PIPING

Installation and Checking of Gas Line

Guidelines for installing and checking the gas supply line for safety and proper function.

Observing Burner Operation

Instructions on how to observe and verify correct burner ignition and flame appearance.

Combustion Air

Explains the importance of combustion air and how to adjust it for efficient burner operation.

If Furnace Fails to Operate Properly

This document provides comprehensive installation and maintenance instructions for Sealed Combustion Downflow Gas Furnaces, specifically models in the DLAS, DGAT, and DGAM series, which feature forced draft with direct ignition (hot surface). These furnaces are designed for use in manufactured (mobile) homes, recreational vehicles, park models, and modular homes & buildings.

Function Description

The Sealed Combustion Downflow Gas Furnaces are designed to provide efficient heating for various residential applications. Their sealed combustion system draws combustion air from outside the living space and vents exhaust gases directly outside, ensuring a safer indoor environment by preventing the mixing of combustion byproducts with indoor air. The "downflow" design indicates that heated air is discharged downwards into the ductwork, making these units suitable for installations where the furnace is located on an upper floor or in a closet with a downward air distribution system. The direct ignition (hot surface) system provides reliable and efficient ignition of the gas burner, eliminating the need for a pilot light.

Usage Features

The installation process for these furnaces is detailed, emphasizing the importance of proper setup for safe and satisfactory performance. Key usage features and considerations include:

Installation Flexibility: The furnaces are designed for installation in various housing types, including manufactured homes, recreational vehicles, and modular buildings, with specific guidelines for each.
Clearance Requirements: Detailed minimum clearance specifications from combustible materials are provided for alcove and closet installations, ensuring safety and compliance with building codes. These clearances vary depending on the proximity to closet doors and the type of installation.
Return Air Systems: The manual outlines specific requirements for return air systems, including floor or ceiling return air in closet installations. It highlights the need for adequate free area in return air grilles and ducts to prevent negative pressure and ensure proper airflow. Warnings about covering or restricting floor openings for return air are prominently featured to prevent asphyxiation hazards.
Air Distribution Systems: Three typical air distribution systems are illustrated, including single trunk duct and dual trunk duct with crossover connectors. Instructions are provided for adjusting the air temperature rise to meet specified ranges on the furnace rating plate, ensuring optimal heating performance.
Roof Jack Installation: A critical component of the sealed combustion system, the roof jack, is described with detailed instructions for locating and cutting the opening, as well as securing it to the roof and furnace. The importance of proper alignment and sealing to prevent leaks and ensure correct flue operation is stressed. Different roof jack models are specified based on furnace series and roof pitch.
Electrical Wiring: Comprehensive instructions for connecting electrical power and thermostat wires are provided, including safety warnings about disconnecting power before servicing and observing color coding for polarized connections. The manual specifies a separate 120 V.A.C. supply circuit protected by a 15 amp fuse or circuit breaker.
Gas Piping: Detailed guidelines for installing and checking the gas line are included, emphasizing the need to comply with local codes and national standards. Warnings about holding the gas valve firmly during connection to prevent misalignment or damage, avoiding excessive pipe sealant, and never using an open flame for leak detection are highlighted. The manual also provides specifications for natural gas and propane inlet pressures and derating for high altitudes.
Burner Operation Observation: Users are instructed to observe burner ignition and flame color to ensure proper operation. Natural gas flames should be blue with yellow tips, while propane gas flames may be yellow. Abnormal flame colors indicate a need for professional service.
Combustion Air Adjustment: The manual explains how to adjust combustion air using a rod located beneath the gas valve. This adjustment is crucial for efficient burner flame and varies depending on altitude, BTU content of the gas, and gas pressure. It is emphasized that this adjustment should only be performed by a qualified technician to prevent unsafe operation, explosion, or asphyxiation.
Final Procedure: Instructions for installing furnace doors, finishing and trimming alcove/closet installations, and considerations for air conditioner installations are provided. For parallel flow air conditioner arrangements, the furnace must be equipped with a damper to prevent cold air from being discharged up around the heat exchanger, which could lead to condensation and rust.

Maintenance Features

While the document primarily focuses on installation, it touches upon several maintenance-related aspects:

Regular Checks: The "Furnace Set-Up Check List" serves as a guide for initial checks, many of which are relevant for ongoing maintenance, such as ensuring correct roof jack installation, proper gas valve conversion/derating, and correct gas line outlet pressure.
Filter Replacement: The "If Furnace Fails to Operate Properly" section advises making sure filters are clean, indicating that filter maintenance is a user responsibility. The filter type and size are specified in the repair parts list.
Clearance and Obstruction Checks: The importance of unobstructed return grilles, supply registers, and furnace flue piping is highlighted as part of troubleshooting, implying these should be regularly checked.
Professional Service: The document strongly advises against attempting to service the furnace if the cause of failure is not obvious, recommending calling a qualified service agency or gas supplier. This underscores the complexity of internal components and the need for expert intervention for safety and warranty compliance.
Warranty Information: The manual explicitly states that improper installation will void the warranty and that proper furnace setup and adjustment are the responsibility of the retailer/homeowner and not covered under warranty. This encourages adherence to instructions and professional service when needed.
Repair Parts List: A detailed list of repair parts is provided, including part numbers and descriptions for various components like limit switches, booster assemblies, impellers, motors, and ignitors. This facilitates ordering correct replacement parts for maintenance and repairs.