Introduction
This document provides essential field wiring guidance for NORDYNE's iQ Drive heating and air conditioning systems. It covers the interconnection of iQ air conditioners, iQ heat pumps, and iQ modulating gas furnaces, all utilizing an iQ thermostat/controller and variable speed motors connected via a serial communication bus. The focus is specifically on the field-installed control wiring unique to each system configuration.
This guide does not cover general thermostat usage, standard split system installation guidelines, refrigerant charging, or the physical installation of units. For detailed information on specific system combinations and their corresponding components, refer to the provided tables within the document.
Key Components and Wiring
The iQ Drive systems integrate advanced components for efficient climate control. Proper field wiring is crucial for the correct operation of these systems. This manual details the connections required between indoor units (air handlers, furnaces) and outdoor units (air conditioners, heat pumps), as well as the thermostat interface.
Key wiring considerations include:
- Field-supplied wires: 4-conductor shielded cable for thermostats, 3-conductor shielded cable for outdoor units, and 2-conductor cable for control power.
- Thermostat wiring: Ensuring correct connections to terminals like R, C, DX+, DX-, GND, and OD for temperature sensing and communication.
- Outdoor unit wiring: Connecting line voltage and control wiring, including communication cables and 24 VAC control power.
- Furnace and air handler connections: Detailed wiring diagrams are provided for various furnace and air handler models, including specific instructions for different coil types and blower kits.
For detailed wiring diagrams and specific component configurations, please consult the relevant sections and tables within this document.
Important Safety and Installation Notes
Always ensure power is disconnected before performing any wiring. Pay close attention to polarity and wire color schemes as indicated in the diagrams to prevent damage to the equipment. The document includes critical warnings, such as the importance of correctly connecting the 24 VAC power to the 'R' terminal to avoid device damage.
For further assistance or specific product information, NORDYNE provides comprehensive support resources.
