Manufacturer Technical Bulletin Summary: Goodman

This technical guide provides HVAC professionals with a comprehensive summary of critical technical bulletins issued by Goodman Manufacturing. Focusing on practical applications, troubleshooting, and preventative measures, this document aims to enhance understanding and efficiency in servicing Goodman HVAC systems. Adherence to these guidelines ensures optimal system performance, longevity, and compliance with manufacturer specifications.

Goodman H Model Furnaces: Twinning and Control Board Compatibility (Based on SF-044)

Goodman Service Bulletin SF-044 addresses a critical compatibility issue concerning the twinning of H Model Furnaces equipped with the UTEC™ PCBBF132 integrated furnace control board. Early versions of this control board contain a software anomaly that can disrupt the normal operation of twinned furnace installations.

Issue Description

The core problem arises when a "W" (heat call) is initiated while an existing "G" (fan call) is active. The affected software causes the furnace indoor fan motor to cease operation. In a twinned setup, this unexpected shutdown is erroneously interpreted as a fault by the twinning kit (e.g., FTK03 or FTK04), leading to system malfunctions or diagnostic errors. It is important to note that this issue does not typically manifest in single-furnace applications, thus requiring no field corrective action for such installations.

Identifying Affected Control Boards

HVAC technicians must verify the control board date code and microprocessor code to determine if it is affected. Each PCBBF132(S) control board features an 11-digit serial number, with the first four digits indicating the manufacturing date (WWYY format). The software correction was implemented starting with certain boards manufactured in week 45 of 2010 (4510 date code) that also bear a '398' microprocessor code. All boards with a date code of 4610 or later are confirmed to have the updated software and the '398' microprocessor code.

Table 1: PCBBF132 Control Board Identification

Corrective Action

For twinning applications involving H model furnaces, technicians must inspect the PCBBF132 control board. If the board falls within the affected categories (prior to 4510 date code, or 4510 with a microprocessor code other than '398'), it must be replaced with an updated version to ensure proper system operation and prevent twinning-related faults.

Hard Start Kit Information and Compressor Protection (Based on SR-004 Rev. 1)

Goodman Service Bulletin SR-004 Revision 1 provides essential guidance on the application of hard start kits and critical information regarding compressor protection. This bulletin is particularly relevant for installations where Goodman products are matched with expansion valve indoor coils.

When Hard Start Kits Are Necessary

Goodman products are typically designed to achieve their rated performance with flowrator expansion devices and do not inherently include start components. However, when these products are installed with expansion valve indoor coils, and the system pressures do not equalize within two minutes, a supplemental hard start kit may be required. Failure to address this can lead to compressor non-starting or frequent internal overload trips. According to Copeland® application bulletin AE4-1329, even pressure differentials as low as 2 PSIG can impede compressor startup without assistance.

Common Causes of Starting Problems

The primary factors contributing to compressor starting issues include:

• Low Voltage: Supply voltage fluctuations can significantly impact compressor startup. Compressors rated 230/208 V are designed to operate within a range of 197 VAC to 253 VAC. During startup, voltage can momentarily drop by 10-15 volts due to high inrush current. Installations with supply voltage exceeding 253 V or lock rotor voltage below 197 V are unsuitable and must be corrected by the local power company. It is crucial to understand that start assist components are not a remedy for chronic low voltage conditions and will not prevent compressor failure under such circumstances.
• Slow Equalization of Pressures: Inadequate pressure equalization between the high and low sides of the system can prevent the compressor from starting.
• Tight Compressor: A new or recently installed compressor may exhibit a 'tight' condition, making it difficult to start. This issue often resolves itself after a brief run-in period, rendering permanent start assist unnecessary.

Goodman Compressor Saver Kits

Goodman offers proprietary "Compressor Saver" start kits designed for use with its HVAC products. These kits are considered accessory items and include:

• CSR-U-1: For 1 – 3 Ton units (88 - 108 Mfd)
• CSR-U-2: For 3 – 5 Ton units (189 - 227 Mfd)
• CSR-U-3: For Scroll 4 – 5 Ton units (270 - 324 Mfd)

The use of these official Goodman Compressor Saver kits will NOT void any existing Goodman warranties. These kits can be purchased through the Goodman Service Parts department.

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