Evcon EB20B - User Manual

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Summary

General Information and Furnace Notes

EB Furnace Notes

Key facts and inclusions for the EB furnace.

Codes

Installation must comply with applicable electrical and building codes.

Location

Requirements for furnace placement for servicing and safety.

Furnace Clearance

Minimum clearances required around the furnace for safety.

Return Air Requirements

Specifications for return air openings for proper furnace operation.

Downflow Furnace Installation Procedures

Duct System Design

Designing duct systems for optimal static pressure and airflow.

Downflow Furnace Installation with 7900 Series Duct Connector

Instructions for installing furnace with 7900 series connector.

Duct Connectors (7990 Series)

Details and dimensions for 7990 series duct connectors.

Installation of Screw Attachment Duct Connector (7990 Series)

Step-by-step guide for screw-attached connectors.

Installation of Tab Attachment Duct Connector (7990 Series)

Step-by-step guide for tab-attached connectors.

Installation of the Furnace

Procedures for physically installing the furnace unit.

Furnace Conversion to Upflow Application

Step-by-step guide to convert for upflow operation.

Hanger Angle Attachment

Instructions for attaching hanger angle during upflow conversion.

Wiring and Electrical Requirements

Wiring Guidelines

Guidelines for electrical wiring, wire sizes, and codes.

Thermostat Installation and Field Wiring

Thermostat Installation

Placement and connection of the thermostat for optimal control.

Field Wiring Shield

Information on the protective shield for field wiring.

Air Conditioning and Heat Pump Accessories

Thermostat Wiring Schematic for Blend Air and Furnace

Schematics and instructions for connecting thermostat wiring.

Optional Air Conditioning Accessories

Information on adding AC or heat pump systems.

Model-Specific Wiring Diagrams

EB10 B Wiring Diagram

Electrical schematic for the EB10B model.

EB12 B Wiring Diagram

Electrical schematic for the EB12B model.

EB15 B Wiring Diagram

Electrical schematic for the EB15B model.

EB17 B Wiring Diagram

Electrical schematic for the EB17B model.

EB20 B Wiring Diagram

Electrical schematic for the EB20B model.

EB23 B Wiring Diagram

Electrical schematic for the EB23B model.

Repair Parts and Field Fix Kits

Repair Parts List

Illustrated list of replaceable parts for various models.

Field Fix Kits

Details on specific field fix kits for certain models.

This document is an installation manual for Downflow/Upflow Electric Furnaces, specifically the EB Series models. It provides comprehensive instructions for the proper installation, operation, and maintenance of these units, emphasizing safety and compliance with various codes.

Function Description:

The EB Series electric furnaces are designed for both downflow and upflow applications, providing heating for residential spaces. They are equipped with a blower and control system that makes them ready for add-on air conditioning and heat pump systems. The furnaces utilize electric heating elements to generate warmth, and their internal components are protected by circuit breakers. The design allows for flexible installation, including in closets or alcoves, with specific clearance requirements to ensure proper airflow and accessibility for servicing. The manual also details how to convert the furnace from a downflow to an upflow configuration, expanding its versatility.

Important Technical Specifications:

The manual provides detailed electrical and blower performance data for various EB Series models (EB10B, EB12B, EB15B, EB17B, EB20B, EB23B).

Electrical Data (Table 4):

Voltage: Rated at 240 volts, 60 Hz, single phase.
D.O.E. Output Capacity: Ranges from 34,000 BTU (EB10B) to 77,000 BTU (EB23B) at 240 VAC.
KW Output: Ranges from 10.0 KW (EB10B) to 22.6 KW (EB23B) at 240 VAC.
Element Capacity @ 240 VAC: Ranges from 9.6 KW / 40.0 AMPS (EB10B) to 21.6 KW / 90.0 AMPS (EB23B).
Motor AMPS @ 240 V: 4.0 Maximum for all models.
Circuit Load AMPS @ 240 V: Varies by model and circuit (e.g., EB10B: CKT 1 - 44.0, CKT 2 - N/A; EB23B: CKT 1 - 47.3, CKT 2 - 46.7).
Wire Size (75°C Copper): Specified for single and dual branch circuits (e.g., #6 for EB10B single branch, #6 for EB23B dual branch CKT 1).
Wire Size (60°C Copper): Specified for single and dual branch circuits (e.g., #6 for EB10B single branch, #4 for EB23B dual branch CKT 1).
Max. Fuse Size (or CB) - AMPS: Ranges from 60 AMPS (EB10B) to 125 AMPS (EB23B) for single branch, and 30-60 AMPS for dual branch circuits.
Ground Wire Size: #6 or #8 for single branch, #10 for dual branch.
Circuit Breakers: Equipped with one or two 60 amp circuit breakers for internal wiring protection and power disconnection.

Blower Performance (Table 3):

CFM (STD. Air) at various static pressures (Inches of WC):
- Low Speed Heating (EB10, 12, 15): 945 CFM at 0.0" WC down to 705 CFM at 0.8" WC.
- Medium Speed Heating (EB17, 20, 23): 1160 CFM at 0.0" WC down to 935 CFM at 0.8" WC.
- Medium High with A-Coil in place: 1340 CFM at 0.0" WC down to 876 CFM at 0.8" WC.
- High with A-Coil in place: 1573 CFM at 0.0" WC down to 1019 CFM at 0.8" WC.

Physical Dimensions (Figure 1):

Filter Size: Universal 16 x 20 x 1 for all models.
Overall Height: 51-5/8 inches (excluding sub-base).
Width: 19-5/8 inches (excluding sub-base).
Depth: Various dimensions for different sections of the unit.
Duct Connectors (7990 Series): Available in various depths (1" to 15") and styles (fingered or screw tab) to accommodate different floor-to-duct dimensions.

Usage Features:

Downflow/Upflow Convertible: The furnace is designed for downflow applications but can be converted to upflow using specific accessory kits (3500-5451* Adapter Box and/or 3500-7211* Upflow Flange Plate Kit).
A/C and Heat Pump Ready: All models are equipped with a blower and control system suitable for add-on air conditioning (up to 4 tons) and heat pump (up to 3 1/2 tons). For higher capacities (up to 5 tons A/C, 4 tons HP), an accessory blower package (3500-7901*) is required.
Thermostat Compatibility: Uses a 4-wire thermostat for heating and cooling. The manual specifies pre-set heat anticipator settings (0.4 Amps) and guidelines for thermostat placement (52 to 66 inches above the floor on an inside wall).
Duct System Design: Emphasizes designing the distribution system to match the furnace's static pressure rating for proper airflow.
Return Air Requirements: Specifies minimum free area openings for return air based on furnace type (heating only, A/C up to 4-tons, A/C up to 5-tons) and provides guidelines for return air grille placement.
Zero Clearance to Combustible Material: Approved for zero clearance to combustible material on the furnace exterior and ductwork, with specific return air clearance exceptions.
Servicing Access: Requires a minimum of 24 inches in front of the furnace for access to heating elements, controls, and blower/element removal.

Maintenance Features:

Filter Replacement: Filters are furnished with each model and are universal (16 x 20 x 1).
Safety Precautions: Emphasizes turning off electrical power at the household service box and furnace circuit breakers before any service or maintenance. Homeowners should not open the electric box door.
Field Wiring Shield: The furnace is equipped with a protective shield over field wiring connections, which must be replaced after wiring is completed to prevent electrical shock.
Customer Envelope: Contains maintenance and operating instructions to be given to the homeowner.
Repair Parts List: A detailed list of replacement parts is provided, including part numbers for thermostats, front panels, filters, blower motors, capacitors, relays, blower wheels, heater elements, transformers, sequencers, circuit breakers, and various other components. This list also indicates if parts are "Special Order" items requiring extra time for delivery.
Field Fix Kits: Specific kits (3500-7121 for EB12, 3500-7151 for EB15) are listed for units manufactured prior to August 1995, including limit baffles and limit switches.