This article details the installation procedures and considerations for Goodman single package gas-electric heating and cooling units, based on available documentation. It covers pre-installation requirements, component placement, connection procedures, and safety precautions. The information is intended for installing personnel and those seeking to understand the process.
Pre-Installation Considerations
Prior to commencing installation, installers are advised to thoroughly familiarize themselves with the applicable Installation Manual and Product Data Book for the specific model. Observing all safety warnings is paramount, as is understanding the responsibility to ensure safe installation and customer education regarding safe operation. The documentation emphasizes the importance of adhering to all applicable codes and regulations. System design and installation should also follow accepted industry guides, such as those published by ASHRAE. The manufacturer disclaims responsibility for installations that violate any code or regulation.
Unit Placement and Base Preparation
Goodman single package units can be installed on the ground or on a roof. When installed on the ground, a level concrete or equivalent base is recommended. This base should extend at least 3 inches beyond the unit’s footprint in all directions and have a minimum thickness of 3 inches. For roof installations, roof curbs must be supported on parallel sides by roof members, ensuring they do not penetrate areas designated for supply and return ductwork to prevent damage to the unit. Flexible duct connectors between the unit and ductwork are recommended. All external ductwork and joints must be insulated and weatherproofed in accordance with local codes. If a bottom discharge configuration is used with a roof curb, the ductwork should be attached to the curb before the unit is installed. Detailed ductwork dimensions are available in separate Roof Curb Installation Instructions.
Component Installation
A Goodman packaged system typically consists of an outdoor condensing unit, an indoor evaporator coil, and a high-efficiency gas furnace. Unlike some systems, this is not a pre-charged, all-in-one unit; each component is installed separately and connected on-site. The furnace can be installed in a basement, attic, closet, or utility room, while the evaporator coil is positioned either above or below the furnace, maintaining a vertical or horizontal orientation to match the system design.
Refrigerant and Electrical Connections
The installation process includes running the refrigerant line set and connecting it to both the condenser and the coil. Electrical connections involve wiring and thermostat installation. A 24V thermostat is required for unit operation and can be purchased with the unit or supplied separately. Prior to any servicing or installation, all power must be disconnected. The documentation cautions that multiple power sources may be present, and failure to disconnect power can result in property damage, personal injury, or death. The unit is equipped with a Low Voltage Terminal Block and single-point wiring to the contactor. A fuse or HACR circuit breaker, exceeding the circuit ampacity but not exceeding the maximum overcurrent protection device, should be used for unit protection.
Gas Line Installation
The gas line installation must comply with local codes or, in the absence of local codes, with the latest edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1. It is crucial to verify that the unit is equipped to operate on the type of gas available.
Wiring Diagrams and Voltage Specifications
The documentation provides wiring diagrams for three-phase units operating at 460-575/60 Hz and 208-240/60 Hz. These diagrams include warnings to disconnect all power before servicing or installing the unit due to the presence of high voltage. Specific voltage requirements vary depending on the model.
Safety and Code Compliance
Several safety and code considerations are highlighted. Furnaces must be vented correctly to prevent carbon monoxide poisoning. Condensers require adequate clearance from structures such as siding, decks, and fences. Many areas require inspections for gas, refrigerant, and electrical work. Installers must adhere to local building codes and manufacturer instructions.
Professional vs. DIY Installation
While Goodman systems are described as DIY-friendly to a degree, certain aspects of the installation require a qualified professional. Specifically, charging refrigerant and pressure testing must be performed by an EPA-certified technician. If a homeowner undertakes part of the installation, it is recommended to hire a technician for these critical steps, obtain necessary local permits for furnace work, and verify compliance with gas line codes.
Important Installation Notes
When installing units with bottom discharge and roof curbs, the ductwork should be attached to the curb before the unit is installed. The documentation also cautions against conduit fittings that do not adequately weatherproof the entry into the building. The rating plate on the unit displays the model number, gas type, and gas input rating, which must be verified before installation.
Electrical Entrance Locations
The documentation specifies the locations for high and low voltage electrical entrances on the unit. For example, on some models, drill locations are marked with 3 3/4” dimples.
Conclusion
The installation of a Goodman single package gas-electric unit requires careful attention to detail, adherence to safety precautions, and compliance with local codes and regulations. While some aspects of the installation can be undertaken by experienced DIYers, critical tasks such as refrigerant charging and pressure testing must be performed by certified professionals. Proper installation ensures optimal performance, energy efficiency, and safe operation of the heating and cooling system.