The Goodman SD side discharge system represents a significant advancement in residential heating, ventilation, and air conditioning (HVAC) technology. Designed for high efficiency and smart home integration, this system includes the Goodman GTST connected thermostat and supports a range of installation configurations. This guide is based on the latest installation and commissioning documentation provided by the manufacturer and is intended for HVAC professionals and knowledgeable DIY users. It outlines key technical requirements, recommended installation practices, and essential commissioning steps necessary to ensure the system operates as intended.
Installation Overview and Key Considerations
Prior to beginning the installation of a Goodman SD side discharge system, it is critical to understand the technical specifications and limitations of the system. The system is compatible with 80%, 96%, and 97% communicating furnaces, and heat pump systems must be installed above snow level in regions where snow accumulation is a concern. Horizontal configurations are limited to A/C with gas furnaces or heat pumps with air handlers.
The system supports up to five zones when using the EWC UT3000 zoning panel. Each zone must be controlled by either a Goodman GTST thermostat or a Daikin One controller. A single zone panel is sufficient for two to three zones, while four to five zones require two zone panels.
Transformer and Electrical Requirements
An essential component of the installation process involves the transformer setup. When installing an CAPFEA, CAPFE, or CHPE system, an additional transformer must be installed in either the gas furnace or the MBVC blower module. The manufacturer's documentation provides specific guidance and illustrations for transformer installation. Ensuring proper transformer installation is crucial for maintaining system communication and operational stability.
Low-voltage wiring is also a critical consideration. Communication wires must operate within the manufacturer’s voltage specifications of 0.5–0.9 VDC. If existing wiring does not meet these specifications, it is recommended to replace the wiring with a 18/2 stranded non-shielded cable between the outdoor unit and the indoor coil or air handler. From the indoor unit to the Goodman GTST controller, a 18/4 stranded non-shielded cable is recommended. Additionally, auxiliary contacts within the thermostat are electronically dry and require 24VAC for proper operation.
Line Set Sizing and Refrigerant Charging
Correct line set sizing is essential for optimal system performance. If reusing an existing line set, the sizing chart on page 12 of the installation manual should be consulted. If the line set is not appropriately sized, the manufacturer recommends replacing it. The use of improperly sized line sets can lead to inefficiencies, operational issues, and reduced system lifespan.
Refrigerant charging is another critical aspect of installation. The total charge is calculated as the sum of the factory charge and any additional charge required. Charging charts for all possible system sizes, line set sizes, and coil styles are provided in pages 22–26 of the installation manual. These charts must be used to ensure the system is charged correctly. Failure to follow these guidelines may result in improper cooling or heating performance, as well as potential damage to the system components.
Commissioning and Cloud Setup
Commissioning is a mandatory step before the Goodman SD system can be operated. The process involves the use of the Goodman Installer app, which can be downloaded from respective app stores (iOS and Android). The app does not require account creation for login. Users are prompted to enter the following credentials:
- User: Goodman
- Password: Dealer
Once logged in, technicians can modify system settings through the app and upload them to the thermostat. The system will not operate until all commissioning steps are completed, including entering the system into "System Test." Only after this step is completed will the system allow the user to turn it on.
Cloud commissioning is conducted via Wi-Fi, ensuring remote access and ease of configuration. This step is essential for verifying system compatibility and ensuring all components communicate correctly. During the commissioning process, the technician should ensure that all settings align with the user's preferences and the system's intended use.
Zoning and Thermostat Configuration
Zoning is an optional but recommended feature for larger spaces or homes with multiple levels. The Goodman SD system supports zoning via the EWC UT3000 zoning panel. Each zone must be controlled by either a Goodman GTST thermostat or a Daikin One controller. The maximum number of zones allowed is five, and the number of zone panels required depends on the number of zones:
- 2–3 zones: One zone panel
- 4–5 zones: Two zone panels
Thermostats must be installed in each zone according to the manufacturer's guidelines. The use of non-approved zoning equipment is not recommended, as it may interfere with system communication and performance.
Smart Thermostat Integration
The Goodman GTST connected thermostat is a key component of the system, offering advanced inverter technology and remote control capabilities. The thermostat is compatible with all Goodman communicating unitary equipment and can be linked via Wi-Fi to the Goodman Home app. This allows users to control the system from an iOS or Android phone or tablet.
The thermostat supports features such as temperature monitoring, system diagnostics, and user preferences. It is important to ensure that the thermostat is installed in an accessible and representative location within the home to ensure accurate temperature readings and optimal system performance.
Precautions and Compatibility
Before proceeding with installation, it is essential to verify compatibility with existing equipment. The system is not controlled by the Comfortbridge platform, and if connected to a Comfortbridge furnace, technicians must check for critical OTA (Over-The-Air) updates through the CoolCloud app prior to commissioning. This step ensures that the system is compatible with the latest firmware and operational standards.
Additionally, the system must be commissioned using the Goodman Installer app rather than third-party control systems. This ensures that all settings are applied correctly and that the system is configured for optimal performance.
Conclusion
The Goodman SD side discharge HVAC system is a high-efficiency solution designed for modern homes with advanced heating and cooling needs. Proper installation and commissioning are essential for ensuring optimal performance, energy efficiency, and user satisfaction. Key considerations include transformer installation, line set sizing, refrigerant charging, zoning configuration, and cloud-based commissioning. Technicians should follow the manufacturer's guidelines closely and consult with local representatives for additional support. By adhering to these best practices, installers can ensure that the Goodman SD system operates as intended, providing reliable comfort for years to come.