Carrier HK28ZT001 Control

The Carrier HK28ZT001 Control is a critical microprocessor-based smoke detector control module specifically engineered for integration within commercial and residential HVAC systems. Designed to facilitate high-reliability fire safety, this wired control unit continuously analyzes air samples through a photoelectric smoke sensor interface to trigger immediate unit shutdown during an alarm event, preventing the hazardous circulation of toxic gases through ductwork. The HK28ZT001 module supports multiple operating voltages and features a high-impedance fan shutdown line that pulls to ground when smoke is detected, ensuring compatibility with ComfortLink controls and VVT systems.

As an OEM Carrier replacement part, this hardwired smoke control replaces aging or faulty boards in rooftop units (RTU) and air handlers ranging from 2 to 25 tons. Its differential sensing logic helps mitigate environmental drift and dust accumulation to reduce false alarms in the field. This unit includes the necessary wire harness for a secure physical connection, maintaining stable communication and eliminating the signal interference risks common with wireless alternatives. It is essential for technicians managing duct smoke detector maintenance and system-wide emergency shutdown protocols.

• Advanced Microprocessor Analysis: Utilizes sophisticated algorithms to distinguish between ambient particulate and real fire conditions, minimizing nuisance trips.
• Dual-Detector Support: A single Carrier HK28ZT001 board can manage up to two smoke sensors, providing coverage for both supply and return air paths.
• System-Wide Shutdown: Immediately interrupts HVAC blower operation upon alarm to isolate fire zones and prevent smoke migration via air ducts.
• Diagnostic LED Indicators: Features clear visual status for power, alarm, and trouble states, streamlining HVAC troubleshooting for field service technicians.
• Terminal Block Flexibility: Includes auxiliary relay contacts for seamless connection to the building's fire alarm control panel (FACP) and other safety equipment.

What causes a "Trouble" LED on the HK28ZT001?
A trouble state is typically triggered by a missing sensor cover, a 100% dirty sensor needing cleaning, or a wiring fault between the controller and the photoelectric sensor. All trouble states are latched and require a manual reset after the condition is cleared.

Is this module compatible with all Carrier duct detectors?
The HK28ZT001 is designed to interface with Carrier SuperDuct series sensors and is used across many 48 and 50 series rooftop units. Always verify your specific unit model number and wiring diagram for exact fitment.

Can I test the HK28ZT001 without manual smoke application?
Yes, technicians can perform an operational test using an SD-MAG test magnet on the sensor module or via a remote test/reset station wired to the controller’s interface terminals.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.