Nordyne B3BV Series - User Manual

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Summary

General Information

Codes

Specifies adherence to HUD and NEC codes for electrical wiring.

Location

Refers to installation instructions for specific location requirements.

Clearance

Details zero-clearance approvals and speed requirements for downflow installations.

Ventilation

Explains the need for ventilation air and specifies adaptor part numbers.

Return Air

Specifies required free opening sizes and clearance rules for return air.

Supply Air Ducts

Discusses duct system static pressure and plenum connectors for downflow.

Summary

General Information

Codes

Specifies adherence to HUD and NEC codes for electrical wiring.

Location

Refers to installation instructions for specific location requirements.

Clearance

Details zero-clearance approvals and speed requirements for downflow installations.

Ventilation

Explains the need for ventilation air and specifies adaptor part numbers.

Return Air

Specifies required free opening sizes and clearance rules for return air.

Supply Air Ducts

Discusses duct system static pressure and plenum connectors for downflow.

This document outlines the installation and maintenance procedures for the B3BV Series Electric Furnaces, specifically designed for use in HUD-approved manufactured homes and modular homes. These furnaces are intended to provide heating and can be integrated with NORDYNE heat-pump/air conditioning coils for a complete HVAC system. The instructions emphasize adherence to all applicable national and local codes and standards, including the HUD Manufactured Home Construction and Safety Standard and the National Electric Code (NEC). Proper installation by qualified and experienced individuals is crucial to prevent fire, electrical shock, personal injury, or property damage.

Function Description

The B3BV Series Electric Furnaces are primarily designed to provide electric heating for residential applications. They are equipped with factory-installed electric heat elements, with various kilowatt (KW) ratings available, such as 15 KW and 20 KW models. The furnaces can be configured for both downflow and upflow applications, offering flexibility in installation within different home layouts. They are suitable for "freestanding" installations as well as in closets or alcoves.

A key feature of these furnaces is their compatibility with NORDYNE heat-pump/air conditioning coils, which can be installed in the field to provide cooling capabilities. This allows the B3BV furnace to serve as a central component of a comprehensive HVAC system, offering both heating and cooling from a single indoor unit.

The internal wiring of the furnace includes circuit breakers that provide short-circuit protection for the internal components and serve as a unit disconnect. It's important to note that these internal breakers do not provide over-current protection for the supply wiring; this protection must be provided at the main distribution panel of the home, sized according to the unit's data label and NEC requirements.

The blower motor within the furnace is responsible for circulating conditioned air throughout the duct system. It comes with multiple speed settings (High, Medium, Low) that can be adjusted to optimize system performance and comfort, depending on the specific application and whether heating or cooling is being utilized.

Usage Features

The B3BV furnaces offer several usage features that enhance their adaptability and performance:

Flexible Installation: They can be installed in either downflow or upflow configurations. Downflow applications typically require a plenum connector to direct supply air through the floor, while upflow installations may utilize a pedestal mounting stand.
Ventilation Air: The units are designed with cut-outs on each side for ventilation air. To comply with H.U.D. rules, specific NORDYNE adaptors (part numbers 914120 or 914427) must be used with Ventilaire III or IV systems to ensure proper ventilation. These connections must remain intact even after servicing or adding A/C components.
Return Air Requirements: For closet or alcove installations, specific free opening areas for return air are mandated: 235 square inches for B-cabinet models (19 3/4" wide) and 300 square inches for C-cabinet models (22 1/2" wide). Clearances between the furnace and the return air opening are also specified to ensure adequate airflow.
Duct System Compatibility: The furnace is designed to work with duct systems where the external static pressure does not exceed the maximum limit indicated on the unit data label. Optional plenum connectors are available for various duct sizes, or field-constructed connectors can be used if they meet the specified requirements.
Motor Speed Selection: The blower motor speed is factory-preset but can be adjusted by qualified personnel. This allows for optimization of airflow for both heating and cooling, ensuring efficient operation and comfort. High-speed operation is specifically required for 20 KW electric heater kits in downflow applications.
Coil Installation: Approved air conditioning and heat pump coils can be installed in the field. The manual provides steps for installing the indoor coil, including removing and reinstalling access plates and ensuring proper orientation for downflow applications to accommodate refrigerant and condensate lines.
Electrical Configuration: The units support various electrical configurations, including single or dual supply circuits, depending on the KW rating. Single circuit adaptor kits may need to be re-configured based on the application, and proper tightening of lugs is emphasized for secure electrical connections.

Maintenance Features

Maintenance of the B3BV Series Electric Furnaces primarily involves ensuring proper electrical connections, verifying component functionality, and adhering to safety protocols:

Electrical Safety: A critical maintenance feature is the explicit warning to disconnect all electrical power to the unit before performing any maintenance or service. This is due to the risk of electric shock, personal injury, or death, and the fact that the unit may have more than one electric power supply.
Circuit Breaker Access: The internal circuit breakers, which provide short-circuit protection, are accessible for inspection and replacement if necessary. The manual provides a parts list for heater kit replacement parts, including circuit breakers, contactors, and limit switches.
Component Replacement: The manual includes a detailed parts list for heater kit components, such as element assemblies, contactors, and limit switches. This facilitates the identification and replacement of faulty parts, ensuring the continued operation of the heating system. Only factory-authorized kits or accessories should be used when modifying the product.
Thermostat Wiring: The manual provides various wiring diagrams for typical heating-only, air conditioning, and heat pump system connections, including options for outdoor thermostats. These diagrams are essential for troubleshooting and ensuring correct control system operation.
Blower Motor Maintenance: While not explicitly detailed as a user-serviceable item, the ability to adjust blower motor speed implies that the motor and its connections are accessible for inspection and adjustment by qualified technicians.
Ventilation System Integrity: The instructions emphasize that Ventilaire connections must not be left disconnected after servicing or adding A/C to the system, highlighting the importance of maintaining the integrity of the ventilation system for H.U.D. compliance.
Documentation: The installer is instructed to leave the installation instructions with the homeowner, providing them with essential information for future reference, troubleshooting, and understanding the unit's requirements.

Nordyne B3BV Series Specifications

General

Efficiency	80% AFUE
Blower Motor	Multi-Speed
Thermostat Compatibility	Standard
Fuel Type	Gas
Configuration	Upflow
Heating Capacity	40, 000 - 120, 000 BTU/h
Warranty	5-year Parts