Durastar Third-Party Thermostat Interface Installation Manual

Introduction

To better serve you, please do the following before contacting customer service:

• If you received a damaged product, immediately contact the retailer or dealer that sold you the product.
• Read and follow this owner's manual carefully to help you use and maintain your air conditioner.
• Read the troubleshooting section of this manual as it will help you diagnose and solve common issues.
• Visit Durastar on the web at www.durastar.com to download product guides and up-to-date information.
• For warranty service, contact Durastar customer service representatives via email at question@durastar.com or by telephone at 1-888-320-0706.

Important Safety Precautions

Improper handling can cause serious damage or injury. Please read the following safety information in its entirety.

Electrical Safety

• The product must be properly grounded at the time of installation to prevent electrical shock.
• For all electrical work, follow all local and national wiring standards and regulations. Connect cables tightly and clamp them securely to prevent external forces from damaging wiring terminals. Improper electrical connections can overheat and cause fire, and may also cause shock.
• All electrical connections must be made according to the Electrical Connection Diagram located on the unit's control box and the panels of the indoor and outdoor units.
• All wiring must be properly arranged to ensure that the control board cover can close properly. If the control board cover is not closed properly, it can lead to corrosion and cause connection points on the terminal to heat up, catch fire, or cause electrical shock.
• All wires must be properly sized according to the NEC/NFPA 70, CEC and all prevailing codes, ordinances, and standards.
• Installation should be performed by a licensed contractor or electrician. Improper installation may result in electric shock or fire.
• Ensure the power to both the indoor and outdoor unit is disconnected before installing this kit.
• Do not install the control box in an area subject to excessive moisture, near flammable liquids or gases.

Installation Safety

• Installation must be performed by an authorized dealer or specialist. Improper installation can cause water leakage, electrical shock, or fire. (In North America, installation must be performed in accordance with NEC and CEC requirements by authorized personnel only.)
• Installation must be performed according to the installation instructions. Improper installation can cause water leakage, electrical shock, or fire.
• The unit shall be installed in accordance with national and local wiring regulations. Contact an authorized service technician for repair or maintenance of this unit.
• Only use the included accessories, parts, and specified parts for installation. Using nonstandard parts can cause water leakage, electrical shock, fire, and unit failure.
• Do not install the unit in an area subject to excessive moisture.
• Do not install the unit near flammable liquids or gases, or fire may result.
• Do not install the unit in a location that may be exposed to combustible gas leaks, as this may cause a fire.
• Do not turn on the power until all work has been completed.
• If moving or relocating the unit, consult experienced service technicians for disconnection and reinstallation.

Supported Mini-Split Units

Outdoor Units:

• Single Zone: DRA1U09S1A, DRA1U12S1A, DRA1U18S1A, DRA1U24S1A, DRA1U09S1B, DRA1U12S1B, DRA1U18S1B, DRA1U24S1B, DRA1H09S1A, DRA1H12S1A, DRA1H18S1A, DRA1H24S1A
• Multi-Zone: DRA2U18M1A, DRA3U28M1A, DRA4U36M1A, DRA5U48M1A, DRA2U18M1B, DRA3U28M1B, DRA4U36M1B, DRA5U48M1B, DRA5U55M1B, DRA2H18M1A, DRA3H28M1A, DRA4H36M1A, DRA5H48M1A, DRA5H55M1A

Indoor Units:

• Wall Mounted: DRAW09F1A, DRAW12F1A, DRAW18F1A, DRAW24F1A, DRAW09F1B, DRAW12F1B, DRAW18F1B, DRAW24F1B
• Cassette: DRAC09F1A, DRAC12F1A, DRAC18F1A, DRAC24F1A, DRAC24F1B
• One-Way Cassette: DRAL06F1A, DRAL09F1A, DRAL12F1A, DRAL18F1A
• Slim Ducted: DRAD09F1A, DRAD12F1A, DRAD18F1A, DRAD24F1A
• Floor/Ceiling: DRAF18F1A, DRAF24F1A
• Floor Mounted: DRAS12F1A, DRAS12F1B

Supported Thermostats

This system is designed for operation with standard 24VAC HVAC thermostats. Standard Wifi HVAC thermostats such as NEST, Ecobee, Honeywell, etc., may be used with this interface unit.

Parts Identification

Installation Location

Unit Dimensions

The unit dimensions are approximately 8 11/16 inches (220mm) in width, 7 7/8 inches (200mm) in height, and 2 1/2 inches (63mm) in depth. Other dimensions provided are 1 1/4 inches (32mm) and 9/16 inches (15mm) for specific features.

The installation must be performed in accordance with the required local and national standards. The installation may be slightly different in different areas.

Installation Requirements

• The unit should be installed indoors. If installed outdoors, the thermostat MUST be contained within an approved waterproof enclosure.
• Install the unit with 6 inches (153mm) of clearance around it and where it can be easily accessed for service.
• Install the unit in an area free from drips and moisture.

The diagram illustrates correct mounting ('Right (Raised)') versus incorrect mounting ('Wrong (Recessed)').

Unit Installation

1. Remove the cover: Using a Phillips screwdriver, remove the eight (8) screws holding the cover in place and take off the cover.
2. Mount the unit: Mount the unit to a wall or raised floor surface using the three (3) screws (M4x20) and three (3) anchors.
3. Wire the unit: Wire the thermostat interface to your system and a third-party thermostat, according to the instructions in the Wiring and System Configuration section of this manual.
4. Secure the unit: Replace the cover and secure it, using the screws removed in the first step.

Wiring and Configuring

Wiring the third-party thermostat interface

Follow the wiring diagram to connect this thermostat interface kit between a third-party thermostat and a Durastar system. The diagram shows connections between the Thermostat, the 24V Interface Control Box, the Indoor Unit Main Control Panel, and the Outdoor Unit. Key connections include:

• Thermostat terminals (R, C, Y, W, G) connect to the interface control box terminals (e.g., CN15 R/C, CN19 Y, W, G).
• The interface control box connects to the Indoor Unit Main Control Panel via Comm.Bus, G, L1, L2, and S terminals.
• The interface control box connects to the Outdoor Unit via G, L1, L2, and S terminals.
• Power is supplied via transformer connections (TRANSFORMER, TRANS_N, TRANS_L).
• Note: Do not install the T1 sensor.

Wiring Connection Specifications

1. For ducted indoor units (DRAD##F1A), static pressure setup requires temporarily connecting communication wires L1(1), L2(2), S(3), and G from the outdoor unit to the indoor unit. Refer to the DRAD install manual or service.durastar.com for details. After setup, disconnect the units and proceed. For other IDUs, proceed directly to step two.
2. Connect L1(1), L2(2), and S(3) from the outdoor unit to terminals 1, 2, and 3 on the right half of the interface's power distribution block. Connect G to a ground block (green) terminal.
3. Connect L1(1), L2(2), and S(3) from the indoor unit to terminals 1, 2, and 3 on the left half of the interface's power distribution block. Connect G to a ground block (green) terminal.
4. Connect R and C from the 3rd party thermostat to board terminals R and C at CN15. Connect Y, W, and G to wiring block terminals Y, W, and G at CN19.
5. Configure the DIP switches in the 24V control box according to the DIP Switches section.
6. The thermostat must be configured for a conventional system (single stage cooling and heating). Do not configure the thermostat for heat pump operation.

Configuring the DIP Switches

The DIP switch sets are numbered from right to left.

For Durastar systems, DIP switches 1-1 and 1-2 must be set to the ON position.

DIP Switch 1-1: Control Box Display

DIP Switch 1-2: Unit Type Determination

DIP Switch 2-1: System Operation Selection

DIP Switch 2-2: Indoor Coil Protection

Leave on default.

DIP Switch 3-1: Dry Function Activation

Leave on default.

DIP Switch 3-2: Compressor Run Time

Leave on default.

DIP Switch 4-1 & DIP Switch 4-2: Factory Testing

These switches are for factory testing purposes only. Leave on default/(OFF).

Error Codes

Wiring Diagram

The wiring diagram illustrates the connections between the thermostat, the 24V Interface Control Box, the Indoor Unit Main Control Panel, and the Outdoor Unit. It details the routing of wires for communication (Comm.Bus, L1, L2, S), fan control (G), and power (TRANSFORMER, TRANS_N, TRANS_L) to specific terminals on each component.

Key connections include:

• Thermostat to Interface: R and C to CN15 R/C; Y, W, G to CN19 Y, W, G.
• Outdoor Unit to Interface: L1(1), L2(2), S(3) to interface terminals 1, 2, 3 respectively; G to a ground block.
• Indoor Unit to Interface: L1(1), L2(2), S(3) to interface terminals 1, 2, 3 respectively; G to a ground block.
• Power: Transformer connections are shown for AC 24V and AC 220V/120V.

Limited Warranty - Parts

TEN (10) YEARS PARTS

Durastar warrants its Covered Equipment parts against defects in materials or workmanship for a period of ten (10) years from the date of installation to the original owner in a residential single-family home. If a part is found defective, Durastar will repair or replace it at its option. If an exact replacement is unavailable, an equivalent part or credit will be provided. Replacement parts carry the balance of the original warranty.

To Qualify:

• The mini-split equipment must be installed in a residential single-family home (defined as any single-family dwelling, including apartments, condominiums, duplexes, and homes).
• The original owner must reside in the single-family home.
• The equipment must be properly installed by a contractor licensed for HVAC installation, following all local and state laws.
• Any part to be replaced must be made available in exchange for the replacement.

Effective Date of Warranty

The warranty's effective date is the original installation date verified by the installer's invoice. For new construction, the final occupancy permit or builder's proof of purchase can substitute. If the installation date cannot be verified, the effective date is the manufacture date plus ninety (90) days.

Warranty Exclusions:

This Limited Warranty does NOT cover:

• Labor costs or expenses for service, removal, or reinstallation.
• Shipping costs for parts.
• Damages, malfunctions, or failures resulting from improper installation, operation, or maintenance.
• Misuse, accident, corrosive atmosphere, vandalism, freight damage, fire, flood, freeze, lightning, acts of war, acts of God, etc.
• Parts installed with the Covered Equipment or used in normal maintenance (e.g., air filters, thermostats, tubing).
• Equipment not installed in the United States.
• Equipment not installed by a qualified, trained HVAC professional in accordance with applicable codes and practices.
• Use of unauthorized attachments, accessories, or components, or alterations/modifications to the unit.
• Equipment moved from its original installation location.
• Operation with system components or accessories that do not match or meet manufacturer specifications.
• Equipment sold via the Internet or auction website and not installed by a trained, qualified HVAC professional.
• Equipment that is not part of a properly matched system as specified by AHRI.

Commercial Warranty

Installations in commercial applications carry a FIVE (5) YEAR PARTS warranty, subject to the same terms and exclusions.

Obtaining Warranty Service

If your product is defective, contact the licensed contractor who installed your system, or another licensed contractor, dealer, or distributor. Durastar Customer Support is available for troubleshooting. Before contacting, have your model number, serial number, and proof of purchase ready. An authorized representative will verify eligibility and determine service options. Service is provided during normal business days and hours.

This warranty is in lieu of any other warranty, express or implied, including warranties of merchantability or fitness for a particular purpose. Durastar, its distributors, sellers, manufacturers, and distributors shall not be liable for incidental, consequential, indirect, special, or punitive damages, including lost revenues or profits, or any other damage. Liability is limited to the basic cost of the product. Some states do not allow the exclusion of incidental or consequential damages, so the above exclusion may not apply to you. This warranty gives you specific legal rights, and you may have other rights that vary from state to state.