This document is an Installer's Guide for Supplemental Electric Heaters, providing essential information for the installation, operation, and maintenance of these units. It covers various models under the BAYHTRV series, including single-phase and three-phase configurations, with different voltage and amperage ratings.
Function Description
The supplemental electric heaters are designed to provide additional heating capacity for packaged cooling/electric heat units and heat pump units. They integrate with the main HVAC system to deliver warmth, especially in colder conditions or when the primary heating source requires assistance. The guide details the installation process, from initial checks to wiring connections, ensuring safe and efficient operation. It also provides wiring diagrams for both air conditioner and heat pump applications, illustrating how the electric heaters interface with the overall system controls and power supply.
Important Technical Specifications
The guide lists a comprehensive table of supplemental electric heater models with their corresponding technical specifications:
- Unit Models: BAYHTRV105, BAYHTRV108, BAYHTRV110, BAYHTRV115, BAYHTRV120, BAYHTRV125 (single-phase) and BAYHTRV305, BAYHTRV308, BAYHTRV310, BAYHTRV315, BAYHTRV320, BAYHTRV325, BAYHTRV405, BAYHTRV408, BAYHTRV410, BAYHTRV415, BAYHTRV420, BAYHTRV425 (three-phase).
- Rated Voltage: Available in 208/240V for single-phase and 208/240V or 480V for three-phase models.
- Phase: 1 or 3 phase.
- Amps: Ranges from 10A to 104A, depending on the model and voltage.
- Heater Capacity (KW): Ranges from 3.76 KW to 25.0 KW.
- Heater Capacity (BTUH): Ranges from 12800 BTUH to 85300 BTUH.
- Number of Stages: 1 or 2 stages.
- KW/Stage: Specifies the heating capacity per stage (e.g., 3.76/5.0 KW, 7.5/10.0 KW, 11.26/15.0 KW, 15.0/20.0 KW, 18.78/25.0 KW).
- MCA (Minimum Circuit Amps): Ranges from 8A to 130A.
- Max. Fuse or HACR Ckt Bkr Size (USA): Ranges from 15A to 150A.
- Canada Only Max. Ckt Bkr Size: Ranges from 15A to 150A.
Key Notes on Specifications:
- All power supply and circuits must comply with local electrical codes.
- Values listed are for the electric heater only.
- Field wiring must be rated at least 75°C.
* indicates an alpha character, & indicates model letter, # indicates heater uses fuses, and & indicates a digit.- The HACR circuit breaker is for U.S.A. installations only; for Canada, specific installation references apply.
Usage Features
The guide emphasizes safe and proper installation and operation.
- Compatibility: Designed for use with specific packaged cooling/electric heat units and heat pump units as detailed in the heater tables.
- Low Voltage Controls: All low voltage connections are made via a polarized plug. The low voltage controls can be connected to the room thermostat from the air conditioner or heat pump low voltage leads, operating at 24 Volts.
- Access Panels: The units are designed with access panels for installation and servicing. Operating the unit without these panels properly installed can result in severe personal injury or death.
- Thermostat Integration: Provides detailed wiring diagrams for connecting the electric heater with various thermostat configurations, including single power entry, economizer accessory connections, auto changeover thermostat connections, and two-stage electric heat connections. For heat pump applications, it also details outdoor thermostat accessory connections and ambient temperature lockout features.
- Multi-Stage Heating: Many models offer two stages of heating, allowing for more precise temperature control and energy efficiency.
Maintenance Features
The guide outlines several aspects related to maintenance, primarily focusing on safe servicing procedures.
- Qualified Personnel: Installation and servicing must only be performed by qualified personnel due to the hazardous nature of HVAC equipment.
- Safety Precautions:
- Hazardous Voltage: Always disconnect all electric power, including remote disconnects, before servicing. Follow proper lockout/tagout procedures.
- Grounding Required: Reconnect all grounding devices after service. All parts capable of conducting electrical current are grounded.
- Electrical Hazard: Servicing instructions are for qualified personnel only to reduce the risk of electrical shock.
- Chemical Exposure: The product may expose users to chemicals including lead, known to cause cancer and birth defects (as per California's Proposition 65 warning).
- Documentation: The document contains a wiring diagram, parts list, and service information, which should remain with the unit as customer property.
- Heater Installation:
- Remove screws securing the heater panel.
- Remove and discard the patch plate covering the heater opening.
- Slide the heater element section into the opening, engaging the lip and slot on the barrier.
- Replace the four screws.
- Connect the polarized plug from the heater control box to the matching plug on the main unit.
- Low Voltage Wiring (Installation/Maintenance):
- Open the heater's control box access cover.
- Remove the unit's power supply knockout.
- Route field wire through the heater compartment and strain relief bushing.
- Connect power supply to heater's wire leads or fuse block.
- Connect power supply ground lead to heater's ground lead or lug.
- Place the extra heater wiring diagram on the inner surface of the control/heater access panel.
- Close the heater housing cover.
- Reinstall the control box/heater access panel.
- Restore power to the unit.
- Fuse Replacement: For models like BAYHTRV115, 120, 125, 315, 320, and 325, an inner pivoting control box allows access to fuse links mounted on the heater back plate. This design facilitates easier replacement of contactors.
- Personal Protective Equipment: Important to wear appropriate gloves, arm sleeve protectors, and eye protection when servicing or maintaining the equipment.
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