Evcon DGAT075BDD - User Manual

INSTALLATION INSTRUCTIONS
DLAS MODELS
(No Coil Cabinet)
DGAT & DGAM MODELS
(With Built--In Coil Cabinet)
For Installation In:
1. Manufactured (Mobile) Homes
2. Recreational Vehicles & Park
Models
3. Modular Homes & Buildings
SEALED COMBUSTION
DOWNFLOW GAS FURNACES
Forced Draft with Direct Ignition (Hot Surface)
FURNACE SET---UP CHECK LIST
IMPORTANT: ONLY IND I VIDUALS HAVING PROVEN EXPERIENCE WITH THIS TYPE OF EQUIPMENT
SHOULD ATTEMPT TO PERFORM SET-- UP.
- HAS ROOF JACK CROWN B EEN CORRECTLY
INSTALLED?
- HASFURNACEGASVALVEANDBURNERORI-
FICE BEEN CORRECTLY CONVERTED FOR L.P.
GAS WHERE APPLICABLE?
- HASFURNACEGASVALVEBEENDE---RATED
FOR ALTITUD ES ABOVE 2000 FEET WHERE
APPLICABLE?
- IS GAS LINE OUTLET PRES SURE PROPERLY
SET FOR FUEL TYPE? (NATURALGASIS3.5”
W.C.; L.P. IS 10” W.C.)
- IS PRIMARY AIR PROPERLY ADJUSTED PER
INSTALLATION INSTRUCTIONS?
- IS CROSS---OVER DUCT INSTALLED PER
HOME BUILDER AND EVCON INSTALLATION
INSTRUCTIONS?
- HAS FURNACE BEEN OPERATED THROUGH A
COMPLETE HEATING CYCLE?
IMPORTANT: PROPER FURNACE SET--UP AND ADJUSTMENT IS THE RESPONSIBILITY OF THE
RET AILER/HOMEOWNER AND IS NOT COVERED UNDER W ARRANTY.

Summary

INSTALLATION INSTRUCTIONS

FURNACE SET-UP CHECK LIST

A checklist to ensure proper initial setup and configuration of the gas furnace before operation.

GENERAL SPECIFICATIONS AND INSTRUCTIONS

FURNACE SPECIFICATIONS

Details the input/output BTUH and model numbers for DGAM, DGAT, and DLAS series furnaces.

INSTALLATION STANDARDS

Outlines critical codes, regulations, and clearances required for safe and compliant furnace installation.

RETURN AIR REQUIREMENTS

Specifies requirements for return air systems, especially for closet installations of sealed combustion furnaces.

SPECIAL CLOSET INSTALLATIONS

Provides detailed clearance requirements for furnace doors in closet installations with varying gaps.

AIR DISTRIBUTION SYSTEMS

Illustrates three typical supply duct distribution systems and guidelines for air flow design.

ROOF JACKS

Covers the location, cutting, and installation procedures for roof jacks, ensuring proper venting.

CEILING RINGS

Discusses the use and purpose of ceiling rings for fire stop requirements around roof jack penetrations.

DUCT CONNECTORS

Details the selection, application, and installation of various duct connectors for furnace hookup.

TEMPLATE & CUTOUT DIMENSIONS

Provides dimensions for creating templates and cutouts necessary for furnace and duct connections.

DLAS SERIES FURNACES

Installation Procedure for DLAS Furnace

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

DGAT & DGAM SERIES FURNACES

Installation Procedure for DGAT & DGAM Furnaces

Step-by-step instructions for installing the DGAT & DGAM series furnaces, focusing on floor and duct connections.

CONNECTING ROOF JACK TO FURNACE

VENT SYSTEM INSTALLATION INSTRUCTIONS

EXISTING FURNACE REPLACEMENT

Guidelines for replacing an existing furnace, emphasizing the need for a new vent system.

NEW HOME INSTALLATION

Procedures for installing the vent system when the furnace is part of a new home construction.

INSTALLATION IN SNOW REGIONS

Recommendations for vent system extensions in areas prone to heavy snow accumulation.

ELECTRICAL WIRING

CONNECT POWER SUPPLY WIRES

Instructions for safely connecting the incoming 115-volt power supply wires to the furnace.

CONNECT THERMOSTAT WIRES

Guidance on connecting the 24-volt thermostat wires to the furnace control system.

WALL THERMOSTAT

Advice on selecting an optimal location for the wall thermostat to ensure accurate temperature readings.

THERMOSTAT WIRING FOR DGAT AND DGAM SERIES

THERMOSTAT WIRING FOR DLAS (HEAT ONLY) SERIES

WIRING DIAGRAMS

GAS PIPING

INSTALLATION AND CHECKING OF GAS LINE

Procedures for safely installing and checking the gas supply line connections to the furnace.

Observing Burner Operation

Steps to observe burner ignition, flame appearance, and operation cycles for correct performance.

Combustion Air

Guidance on ensuring adequate combustion air supply and adjusting the air shutter for efficient burner operation.

If Furnace Fails to Operate Properly

FINAL PROCEDURE

Install Furnace Doors

Instructions for properly installing the furnace's bottom and upper access doors.

Finish and Trim

Guidance on finishing and trimming alcove and closet installations after the furnace is in place.

Furnace and Air Conditioner Installations

Considerations for installing the furnace in conjunction with an air conditioning unit, including interlocks.

MANUFACTURED HOUSING DERATION CHART

DGAM, DGAT & DLAS SERIES HSI Gas Downflow Furnace

Repair Parts List for:

An introduction to the parts list for various DGAM, DGAT, and DLAS HSI gas downflow furnace models.

BLOWER PARTS

Lists specific part numbers for blower components used in the DGAM, DGAT, and DLAS furnaces.

BURNER ORIFICE CHART

Provides a chart detailing burner orifice sizes and part numbers for different gas types and elevations.

Overview

1. Function Description
2. Usage Features
3. Maintenance Features

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.

Evcon DGAT075BDD Specifications