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This document describes the installation and operation of the Carrier VRF DX Coil Interface, which connects an Air Handling Unit (AHU) with a Direct Expansion (DX) coil to a Carrier VRF outdoor unit. The interface is designed for commercial use and utilizes R410A refrigerant.
Installation, maintenance, repair, and removal of the VRF DX Coil Interface must only be performed by a qualified installer or service person. Failure to adhere to proper procedures can lead to fire, electric shock, injury, water leakage, noise, or malfunction. Always wear protective gloves and safety work clothing. When working at heights, use a ladder compliant with ISO 14122 and wear a helmet. Before any work, disconnect all remote electric power supplies and set the circuit breaker to the OFF position, placing a "Work in progress" sign. The refrigerant used is R410A, which operates at higher pressures than R22, requiring specific pipes and tools. Do not modify or disassemble the product, and ensure it is transported in a stable condition.
The DX Coil Interface should be installed indoors, protected from rain, wind, and direct sunlight. Avoid locations with high-frequency generating machinery, oil mist, dense vapor, salt, acidic or alkaline atmospheres, or sulfurizing gas. Do not place water-containing vessels near the unit to prevent electric shock from spills. Ensure the AHU has an air filter to prevent dust accumulation and potential water leakage or defrosting issues. Maintain a minimum 1-meter separation from televisions, radios, or remote controllers to prevent interference. The unit is not intended for special-purpose use (e.g., food, animals, precision machinery, artwork storage) or locations where wetness could cause damage. Avoid areas with organic solvents or high humidity, as condensation may occur. If installed in high-humidity areas (dew-point temperature 23°C or higher), additional heat insulation (e.g., grass wool) should be applied to all contact points. Ensure sufficient space for service and fix the DX Coil Controller and DX Valve Kit to a stable surface to prevent vibration or noise. Do not install in locations with significant temperature differences or high temperatures/humidity (52°C or more / RH 80% or more) to prevent condensation, rust, or malfunction. Avoid installing where iron or metal dust is present, as it can lead to spontaneous combustion.
Install refrigerant pipes securely before operating the air conditioner. Operating the compressor with an open valve and no refrigerant pipe can lead to air intake, over-pressurization, and injury. After installation, confirm no refrigerant gas leaks. If R410A leaks and comes into contact with a fire source, noxious gases may be generated. Purge air completely from the refrigerating cycle after installation or relocation to prevent malfunction. Use nitrogen gas for airtightness tests and ensure charge hoses are not slack.
Electrical work must be performed by a qualified installer or service person. Wear protective gloves, insulating shoes, and clothing to prevent electric shocks. Use wiring that meets specifications in the Installation Manual and local regulations to prevent electric shocks, leakage, smoking, or fire. Connect earth wires properly; do not connect them to gas pipes, water pipes, lightning conductors, or telephone earth wires. Install an easily accessible circuit breaker that meets specifications and local regulations. For outdoor installations, use an outdoor-rated circuit breaker. Do not extend power wires, as this can cause smoking or fire. Electrical wiring must conform to local laws and regulations. Ensure the circuit breaker is attached and use fuses of the correct capacity. The power supply must match the rated voltage and use a dedicated circuit for the DX Coil Interface.
Before operating the air conditioner, ensure the electrical control box cover of the AHU and the outdoor unit service panel are closed. Set the circuit breaker to ON. Check insulation resistance (1 MΩ or more) between the charge section and non-charge metal section. If resistance is low, do not operate the unit. Verify that the outdoor unit valve is fully open. To protect the compressor, allow 12 hours of power-ON before operation. Do not forcibly perform a test run by pressing the electromagnetic contactor, as protective devices will not function. Perform cooling/heating test runs to ensure satisfactory system operation.
The VRF DX Coil Interface connects to New Carrier band VRF systems. Each cycle requires one outdoor unit and one DX Coil Interface. AHU design should refer to the AHU submittal.
The DX Coil Interface includes a DX-coil controller (40VAM--C8FATEE without relay, 40VAMR-C8FATEE with relay) and DX-valve kits (40VA010V8-ATEE, 40VA020V8-ATEE).
The DX-coil controller includes:
The DX-valve kit includes:
Note: Sensor holders for TA and TF sensors are not included as accessories.
Maximum real piping length between the valve kit and DX coil is 5 meters. Y-joints (A, B) are specified based on DX coil HP (e.g., RBM-BY205E for 24 HP, RBM-BY305E for 26-60 HP, RBM-BY405E for 61.2 HP or more).
The DX-coil controller requires an exclusive power supply (220-240 V~, 50 Hz or 208-230 V~, 60 Hz) with a 3-core, 2.5 mm² cable. The power supply switch, earth leakage breaker, and fuse rating should be selected based on the accumulated total current values of the DX-coil controllers. Control wiring between indoor/outdoor units and central controllers uses 2-core shielded wires (0.5 mm² to 2.0 mm², up to 500 m). RS-485 communication cables use 2-core shielded wires (1.25 mm², up to 500 m). Do not run communication and power wires in parallel or in the same conduits to prevent noise.
Modbus communication is available. Set the baud rate using SW506, address using SW507 (up to 16 addresses), and terminating resistor using SW801 (120 ohm for the unit with the latest address, OFF for others). Function codes include read holding register, read input register, write single holding register, diagnostics, get comm. event counter, get comm. event log, and write multiple holding registers.
Before making DN settings, ensure the air conditioner is stopped. Only set Code Nos. listed in the manual to avoid malfunction.
If a problem occurs, the OFF timer indicator will alternately show a check code and the indoor unit number. To check troubleshooting history (up to 4 incidents):
Common Check Codes:
For other check codes, refer to the service manual.
General| Brand | Carrier |
|---|---|
| Model | 40VAM-C8FATEE |
| Category | Controller |
| Language | English |
