Honeywell Sensor and Switch Solutions for HVAC Applications

Product Lines for HVAC Support

The following Honeywell product lines are instrumental in supporting key HVAC functions:

✓ Primary sensor/switch used within application (key design consideration for OEM)

✓ Secondary sensor/switch used within application (not a key design consideration)

Key HVAC Applications and Honeywell Solutions

Demand Control Ventilation

An efficient ventilation system responds to real-time data to optimize air recirculation, thereby improving air quality and reducing HVAC running costs. Demand control ventilators enable buildings to meet growing trends for environmentally friendly buildings with better indoor air quality.

• Differential Pressure Sensors: Measure differential pressure for static duct pressure and indoor air quality.
• CO2 Sensors: Adjust ventilation rates based on CO2 levels, crucial for demand control and energy recovery ventilation.
• CO Sensors: Provide high-quality CO detection in residential or commercial environments to help control indoor air quality.
• Power & Position Sensors/Switches: Enable efficient control of electric motors driving fans, blowers, and pumps.
• Temperature Sensors: Used in HVAC temperature controllers and for thermostat control.
• Basic Switches: Provide high-performance mechanical switching, often used on direct-acting damper actuators.
• Limit Switches: Activate or deactivate an element or the entire ventilation system.

Sensors are critical for ensuring the system is working as intended and at its best. They control airflow into a room or duct, while sensors enable monitor valves to control air volume for maximum energy efficiency.

Air Purification & Filter Monitoring

Recent trends highlight the increasing importance of cleaner and healthier air, driving the need for air purification and filter monitoring. Differential pressure sensors are used to detect clogged filters, improving air quality and reducing power consumption.

• Differential Pressure Sensors: Monitor differential pressure for clogged filter detection.
• Basic Switches: Used as air-proving switching assemblies and for mechanical switching for valve position detection.
• Temperature Sensors: Utilized in HVAC temperature controllers and for thermostat control.
• Airflow Sensors: Monitor mass airflow for VAV controllers and in-line transmitters, balancing airflow in complex HVAC systems.
• Magnetic Sensor ICs: Provide motor and fan control, position sensing, and speed sensing for moving parts.

Air Conditioning

Air conditioning systems, whether centralized or standalone, require precise control and monitoring. Honeywell sensors contribute to system efficiency and performance.

• Heavy-Duty Pressure Transducers: Monitor air conditioning compressor output and input pressure to enhance system efficiency and reduce power consumption.
• Differential Pressure Sensors: Used to monitor differential pressure for clogged filter detection, improving air quality.
• Temperature Sensors: Employed in HVAC temperature controllers and for thermostat control.
• Power & Position Switches: Enable efficient control of electric motors driving fans, blowers, and pumps.

Heating System: Commercial

Commercial boilers rely on combustion to heat air and water. Energy efficiency and safety are paramount. Honeywell sensors enhance efficiency and detect faults.

• Heavy-Duty Pressure Transducers: Monitor boiler water/steam output and input pressure for efficiency and reduced power consumption.
• Airflow Sensors: Monitor mass airflow for VAV controllers and in-line transmitters.
• Flow Sensors: Monitor the flow of warm air or water within the heating system to enhance efficiency.
• Power & Position Switches: Enable efficient control of electric motors driving fans, blowers, and pumps.
• CO Sensors: Measure CO levels, critical for safety during incomplete combustion.
• Gas Pilot Switches: Placed on gas pilots to shut off gas flow if the pilot goes out.
• Limit Switches: Activate or deactivate elements or the entire ventilation system.
• Pressure Switches: Monitor steam pressure in boilers to prevent overpressure or low-pressure situations.
• Float Switches: Act as air-proving switching assemblies or float switches for indicating pipe flow backup.
• Limit Switches: Monitor damper or valve position, initiating program sequences when fully open.

Heating System: Residential

Residential heating systems need to be energy-efficient, reliable, and safe. Honeywell sensors contribute to these goals.

• Flow Sensors: Control the flow of warm air or water and detect leaks.
• CO Sensors: Detect incomplete combustion, a source of dangerous carbon monoxide gas.
• Temperature Sensors: Used in smart thermostats for efficient HVAC management and occupant comfort.
• Power & Position Switches: Enable efficient control of electric motors driving fans, blowers, and pumps.
• Limit Switches: Activate or deactivate elements or the entire ventilation system.

Refrigeration

Refrigeration systems require durable sensors and switches for stable temperatures and burst pressures, especially with new refrigerants.

• Heavy-Duty Pressure Transducers: Monitor refrigeration compressor output and input pressure for efficiency and reduced power consumption.
• Basic Switches: Used for presence detection, on/off functions, function monitoring, and end-of-travel in Zone 2 hazardous locations.
• Temperature Sensors: Used in temperature controllers and for compressor temperature monitoring in refrigeration.
• Power & Position Switches: Enable efficient control of electric motors driving fans, blowers, and pumps.
• Limit Switches: Activate or deactivate elements or the entire system.
• Pressure Switches: Monitor overpressure or low-pressure indications to prevent potentially explosive situations.

Detailed Product Specifications

Pressure Sensors and Transducers

• Board Mount Pressure Sensors, Basic ABP/ABP2 Series: Offer pressure ranges from 1 inH₂O to 175 psi, high accuracy (1.5% FSS TEB), temperature compensation and operation from -40°C to 110°C, extensive media compatibility, and analog & digital (FC/SPI) outputs. They are ideal for configurability and value.
• Board Mount Pressure Sensors, TruStability™ RSC, HSC and SSC Series: Provide pressure ranges from 0.5 inH₂O to 150 psi with high accuracy (1.0% FSS TEB), temperature compensation and operation from -40°C to 85°C, and outstanding EMI/EMC performance. Available in analog & digital (FC/SPI) outputs, they excel in accuracy, stability, and performance.
• Heavy Duty Pressure Transducers, MIP Series: Cover pressure ranges from 15 psi to 900 psi with high accuracy (0.75% FSS TEB), operating temperatures from -40°C to 125°C, compatibility with a wide range of fluids and gases, and rugged stainless steel 304L construction. They offer outstanding EMI/EMC performance and are best for accuracy, stability, and performance.

Hall-Effect and Magnetoresistive Sensor ICs

• Linear Hall-Effect Sensor ICs, SS490 Series: Feature small size, low power consumption, single current sinking or sourcing linear output, built-in laser trimmed resistors for sensitivity and temperature compensation, response to positive or negative gauss, and a quad Hall sensing element for stable output.
• Magnetoresistive Sensor ICs: Available in Nanopower Series (SM351LT/SM353LT) and Standard Power Series (SM351RT/SM451R/SM353RT/SM453R). They come in SOT-23 or TO-92-style packages. Sensitivity is typically 7 G (SM351LT/SM351RT/SM451R) or 14 G (SM353LT/SM353RT/SM453R). They feature omnipolar sensing, activating with either pole of a magnet.
• High Sensitivity Latching Hall Sensors: Offer the fastest response time in their class, no chopper stabilization, high sensitivity (operates from 30 gauss typ.), bipolar latching magnetics, and can be supplied on tape-and-reel. SS460S is suitable for BLDC commutation.

Temperature Sensors

• Thermistors, 192/194 Series: High-quality, low-cost, resistance-temperature matched interchangeable units. They have a dissipation constant in still air of 0.75 mW/°C, a time constant in air of 15.0 s, and a maximum diameter of 2.413 mm (0.095 in). Features include an epoxy-coated construction for enhanced stability and life.

Gas Sensors

• Carbon Dioxide Gas Sensor, CRIR-M1 Series: A single-channel, non-dispersive infrared (NDIR) sensor for CO2 detection. It is small, maintenance-free for normal indoor applications, offers enhanced long-term stability, higher accuracy (±40 ppm ±3% of reading), and consistency/repeatability with auto baseline correction (ABC).
• Carbon Monoxide Gas Sensor, ECOSURE X: A cost-effective, two-electrode electrochemical cell for CO detection in domestic, industrial fire detection, and ventilation control. It features a unique design for extreme environments, suitability for accredited products (BS, EN, UL, LPC, VDS, TÜV), and an integrated active filter to prevent false alarms from common vapors.

Airflow Sensors

• AWM3300 Series: Small-sized sensors with amplified signal conditioning, covering ranges from 30 SCCM to 5 mBar. They provide an analog output, consume approximately 50 mW, and operate within a temperature range of -25°C to 85°C (-13°F to 185°F).

MICRO SWITCH Basic Switches

• Large Basic Switches, IBZ and WA Series; DT Series: Accepted world-wide standard "Large Basic" switches with low operating force and differential travel. They offer long mechanical life (up to 20,000,000 cycles at 95% survival) and current ratings from 15 A to 25 A. Options include various actuations, terminations, and operating characteristics. The DT series features two independent single-pole double-throw circuits in one housing.
• V-Basic Miniature Switches, V19 Series: RoHS/REACH/Cal Prop65 compliant with UL/CSA, cUL, ENEC, CQC certifications for global design acceptance. They offer 5 A and 16 A electrical ratings and over 1 million mechanical operations.
• V-Basic Miniature Switches, V15 Series: Designed for 10K to 50K operations at full load or 5M mechanical operations. They feature world-wide package size acceptance, current ratings of 10 A and 26 A, and UL/CSA, cUL, UKCA, ENEC, and CQC approvals.
• Explosion-Proof Basic Switches, V15W2 Series: Approved for Zone 2 hazardous locations, with IP67 equivalence. They hold UL, cUL, UKCA, ENEC, CQC, ATEX, IEC Ex approvals, a 5 A electrical rating, and over one million mechanical operations for longer service life.
• Subminiature Switches, ZM/ZW/ZX Series: Best suited for lower cost-of-failure applications. They are small, lightweight, low cost, with enhanced life and ample electrical capability. Options include low energy or power-duty ratings (gold-plated or silver contacts), and various ratings, actuations, terminations, and operating characteristics. They have UL/CSA, cUL, ENEC, and CE approvals.

MICRO SWITCH Toggle Switches

• Toggle Switches, NT Series: ISA 12.12.01 certified, designed for use near flammable hydrocarbon refrigerants. They feature quick-connect spade terminals, UL191 electrical rating, sealing to NEMA 3, 3R, 4, 13, and IP67, and an operating temperature range of -40°C to 71°C (-40°F to 160°F).

MICRO SWITCH Pushbutton Switches

• Operator Interface Switches and Indicators, AML Series: Includes pushbuttons, paddles, rockers, key-actuated switches, and indicators for coordinated panel appearance. They have a panel depth of less than 1.75 inches and offer two or three positions with maintained or momentary action. Options include one-, two-, or four-poles with double-throw available for most switches.

Pressure Switches

• Extended Duty Pressure Switches, 5000 Series: Designed for extended duty applications, factory set but field adjustable. They feature direct action blade contact and burst pressures of 750 psi (for 0.5 psi to 24 psi set points) and 1250 psi (for 25 psi to 150 psi set points).

Warranty and Remedy

Honeywell warrants its manufactured goods to be free from defective materials and faulty workmanship. The standard Honeywell product warranty applies unless otherwise agreed in writing. For specific warranty details, refer to the order acknowledgment or consult a local Honeywell sales office. If warranted goods are returned during the coverage period and found defective by Honeywell, Honeywell will repair or replace them at its option without charge. This is the buyer's sole remedy and replaces all other warranties, expressed or implied, including merchantability and fitness for a particular purpose. Honeywell shall not be liable for consequential, special, or indirect damages.

While Honeywell may offer information and engineering support, it is the buyer's responsibility to determine the suitability of Honeywell products for their specific requirements. Specifications are subject to change without notice. Honeywell assumes no responsibility for the use of the information provided.

For More Information

Honeywell Sensing Solutions is accessible through a worldwide network of sales offices and distributors. For application assistance, current specifications, pricing, or to locate an Authorized Distributor, visit automation.honeywell.com/hss.