Evcon DGAM056BDD - 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

General Specifications and Installation Standards

Furnace Specifications

Details furnace input and output BTUH ratings for different models and gas types.

Installation Standards and Clearances

Outlines compliance with codes, clearances, and high altitude derating requirements.

Return Air and Closet Requirements

Covers return air grille size, closet clearance, and methods to prevent opening closure.

Air Distribution Systems

Illustrates typical supply duct systems and guidelines for register selection.

Roof Jacks and Ductwork Installation

Roof Jack Installation Procedures

Instructions for locating, cutting openings, and installing roof jacks and flashing.

Ceiling Rings and Duct Connectors

Details on ceiling rings for fire stops and duct connector types and installation.

Series-Specific Installation Procedures

DLAS Series Furnace Installation

Step-by-step procedure for installing DLAS series furnaces, including sub-base requirements.

DGAT & DGAM Series Furnace Installation

Step-by-step procedure for installing DGAT & DGAM series furnaces, noting no sub-base is required.

Vent System and Roof Jack Connection

Connecting Roof Jack to Furnace

Mandatory steps for securely engaging combustion air and flue pipe assemblies.

Vent System Installation Instructions

Guidelines for vent system installation, replacement, and snow region considerations.

Electrical Wiring and Thermostat Configuration

Electrical Wiring and Power Supply

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

Thermostat Wiring Connections

Steps for connecting low-voltage thermostat wires to the furnace control system.

Series Thermostat Wiring Details

Illustrates thermostat wiring for DGAT/DGAM and DLAS series furnaces.

Furnace Wiring Diagrams

DGAT Series Wiring Diagram

Provides a detailed electrical wiring diagram for the DGAT series furnace.

DGAM Series Wiring Diagram

Presents the electrical wiring diagram for the DGAM series furnace.

Gas Piping and Burner Operation

Gas Line Installation and Checking

Covers gas supply piping standards, materials, and leak detection procedures.

Burner Operation and Combustion Air

Guide on observing burner operation, flame appearance, and adjusting combustion air.

Final Procedures and Deration Chart

Furnace Failure Troubleshooting and Final Steps

Steps for troubleshooting furnace failures, installing doors, and AC integration.

Manufactured Housing Deration Chart

Provides deration values for different elevations and gas types for manufactured housing.

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 DGAM056BDD Specifications