Trane BAYHTRS309 - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document provides installation instructions for Trane Precedent™ 6 to 10 Ton Electric Heaters. It covers safety warnings, environmental concerns, proper refrigerant practices, and detailed steps for installation, including electrical wiring and component checks.

Function Description:

The Trane Precedent™ Electric Heaters are designed to provide heating for commercial and residential applications when integrated with Trane and American Standard air conditioning units. These heaters are accessories that work in conjunction with the main HVAC unit to deliver electric heat. The manual outlines the installation process for various models, ensuring proper integration and safe operation.

Important Technical Specifications:

Model Compatibility: The heaters are compatible with a wide range of Trane and American Standard unit models, including TSC, WSC, THC, and TZC series, across 6, 7.5, 8.5, and 10-ton capacities. Specific heater model numbers (e.g., BAYHTRS309, BAYHTRA309, BAYHTRT309) are listed with their corresponding compatible unit models.
kW Ratings: Heater kW ratings vary from 6.8/9.0 kW up to 54.0 kW, depending on the model and voltage.
Control Stages: Heaters are available in 1-stage or 2-stage control configurations, allowing for varied heating output.
Voltage Options: The electrical data tables provide specifications for 208/230 Volts Three Phase, 460 Volts Three Phase, and 575 Volts Three Phase systems. Additionally, there are tables for 380/415 Volt (50 Hz) operation, indicating international compatibility.
Air Temperature Rise: Detailed tables provide air temperature rise data in both Fahrenheit and Celsius for different airflow rates (e.g., 2000 cfm, 3000 cfm, 3400 cfm, 4000 cfm) and M³/H (e.g., 4100 M³/H, 5100 M³/H, 6800 M³/H). This data is crucial for sizing and performance evaluation.
Minimum Allowable Airflow: Specific minimum airflow requirements are noted for certain heater/unit combinations to ensure safe operation and prevent overheating. For example, TSC072E, TZC072F with a 36.0 kW heater requires 2200 cfm, and WSC072H with a 36.0 kW heater requires 2450 cfm.
Electrical Data (MCA/Max Fuse Size/Max Circuit Breaker): Comprehensive tables list Minimum Circuit Amps (MCA), Maximum Fuse Size, and Maximum Circuit Breaker ratings for various unit/heater combinations, indoor fan motor types (standard, oversized, optional EBM), kW ratings, and control stages. This information is critical for proper electrical installation and protection.
Motor Types: The manual specifies different indoor fan motor types, including standard, oversized, and optional EBM (Electronically Commutated Motor) fans. For 1-phase models, the standard motor is a multispeed, direct drive motor. For 3-phase models, it can be a multispeed, direct drive, or belt drive motor, depending on the tonnage.
Electromechanical Control: For units with electromechanical control (digit 9 in the unit model number equals "E"), an accessory relay (BAY24X042) is required if the thermostat does not energize the fan circuit in the heating mode.

Usage Features:

Integration with HVAC Systems: These electric heaters are designed to seamlessly integrate with Trane and American Standard air conditioning units, providing a complete heating and cooling solution.
Multi-Stage Heating: Many models offer 2-stage heating, allowing for more precise temperature control and energy efficiency by adjusting the heating output based on demand.
Horizontal and Downflow Airflow Applications: The installation instructions differentiate between horizontal airflow and downflow airflow applications, providing specific guidance for each, particularly concerning limit control replacement.
Field Wiring and Grounding: The manual emphasizes the importance of proper field wiring and grounding, adhering to NEC and local/state/national electrical codes to prevent fire and electrocution hazards.
Personal Protective Equipment (PPE): Strict adherence to PPE requirements (cut-resistant gloves/sleeves, butyl gloves, safety glasses, hard hat/bump cap, fall protection, electrical PPE, arc flash clothing) is mandated for all installation and servicing tasks.

Maintenance Features:

Pre-Installation Inspection: Before installation, technicians are instructed to unpack all components, check for shipping damage, and verify the heater nameplate model number against electrical data tables to ensure compatibility with the available power supply.
Component Access: The design allows for access to the heater compartment and unit control box through removable panels, facilitating installation and future servicing.
Limit Control Replacement: For specific unit/heater combinations in horizontal airflow applications, the manual details the process for replacing the TCO-A limit control, which is shipped with the heater.
Electrical Connection Verification: After installation and before applying power, it is crucial to verify that heating elements are not damaged, pinched, or short-circuited to each other or to the heater frame/equipment cabinet. This involves testing each heater element with an ohmmeter to ensure electrical isolation.
Terminal Tightness Check: The manual advises checking the tightness of all terminal connections, clamps, and screws after equipment has been in operation and components have reached operating temperature, as these may loosen during shipment or initial operation.
Gasketing Integrity: When replacing covers, technicians must ensure that gasketing is not torn or missing to maintain a watertight seal.
Strain Relief: Good installation practices include providing strain relief for high voltage wires where necessary.
Nameplate Marking: Installers are required to mark the unit nameplate with heater information as per instructions.