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Carrier Variable Frequency Drive (VFD) Installation & Service Manual

Comprehensive instructions for factory-installed VFD options in Carrier Rooftop Units.

Document Overview

This document provides essential installation, start-up, and service instructions for the Carrier Variable Frequency Drive (VFD) factory-installed option. It is specifically designed for use with Carrier 48/50TC, 50TCQ, 48/50HC, 50HCQ, and 40RU 2-Stage cooling rooftop units, sizes 07-30. The VFD enhances motor control for optimal performance and energy efficiency in HVAC systems.

Key Information Covered

Detailed installation procedures for VFD-equipped units.
Guidance on initial start-up and configuration, including Staged Air Volume (SAV™) system operation.
Troubleshooting common VFD alarms and faults.
Maintenance guidelines, such as heat sink cleaning and fan replacement.
Information on VFD parameters and remote keypad operation for ABB ACH580, ACH550, and ACS320 models.
Important safety considerations and compliance with national electrical codes (e.g., ANSI/NFPA70, CSA C22.1).

Product Compatibility

This manual is applicable to specific Carrier rooftop unit models identified by an indicator in the unit's model number. Users are advised to consult Table 1 within the document to confirm VFD factory-installation compatibility. The VFDs discussed include models from ABB, such as the ACH550, ACH580, and ACS320 series, integrated to provide precise 2-speed motor control for enhanced cooling and heating operations.

Models: VFD-11SI Variable Frequency Drive, VFD-11SI, Variable Frequency Drive, Frequency Drive, Drive

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