Sensors & Hydronic Controls for boilers
To measure or control the water flow, temperature or to create, control and maintain a pilot flame in the boiler, you can choose Honeywell's sensors & hydronic controls. We offer a complete range of waterflow sensors, temperature sensors, thermocouples, water valves, pilotburners, aquastats and pressure sensing switches. Choose a product from the table and learn more about the product. Contact us for more information.
Please select Waterflow Sensors Temperature
Sensors
Water Valves Pilot Burners Thermo-
couples
Aqua-
stats
Pressure Sensing Devices
C7195A/B            
T7335            
VC Series            
CWVA            
Pilot Burners            
Thermocouples            
L41/L61            
C4065/C6065            
IS Series            
Waterflow sensors - C7195A/B
Waterflow sensors are primarily designed to measure the Domestic Hot Water (DHW) flow rate in domestic appliances. The C7195A/B is a mechanical water flow sensor. A turbine rotates with water flow. The turbine supports a magnet which rotates in front of a Hall effect sensor. This Hall effect sensor picks up the field of the magnet giving a pulsed output. The output is directly proportional to the water flow through the sensor. This frequency output is easily processed by an electronic controller which can then modulate the burner load (for feedforward loop) or simply open heat demand when the flow reaches its defined minimum rate (electronic flow switch). The sensor body is constructed from pressure and temperature resistant plastic, with easy connections to traditional pipes used in domestic appliances. All parts in contact with the potable water are made out of materials approved by the Water Research Council.

Read more about the features and technical specifications in the product handbook, available in PDF, (602 kb)

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Temperature sensors - T7335
The Honeywell Temperature Sensors have been developed for many applications. These probes are used to measure the temperatur of fluids, air an inert gas, in flue gas pipe, tanks, boilers and in ambient (indoor or outdoor) etc. The sensor elements are usually thermistors (NTC) but other types can be made available on request. The T7335 series are available as direct immersion sensors, well immersion sensors and surface mount sensors. The sensors are available with various NTC and shape combinations.

Read more about the features and technical specifications in the product handbook, available in PDF, (2.143 kb)

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Water Valves - VC series (for combi-boilers only)
The VC series 2-position hydronic valves are used in domestic and small commercial applications to control the flow of hot and/or cold water. They consist of an actuator, valve and a cartridge assembly. 2-way valves are designed for ON-OFF "zone" control of domestic systems. 3-way valves can be piped for either diverting or mixing valve applications in domestic central heating and/or cooling systems. Both versions can be used to control individual fan coil, baseboard radiator or convector applications. Depending on the model selected they can be controlled by a low or line voltage SPST or SPDT controller, such as a room thermostat, aquastat or flow switch.

Read more about the features and technical specifications in the product handbook, available in PDF, (492 kb)

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Water Valves - CWVA (for combi-boilers only)
The CWVA 2-position hydronic valves are used in domestic and small commercial applications to control the flow of hot and/or cold water. They consist of an actuator and a valve. 3-way valves can be piped for either diverting or mixing valve applications in domestic central heating and/or cooling systems. Depending on the model selected they can be controlled by a low or line voltage SPST controller, such as a room thermostat, aquastat or flow switch. The 2 wires Vdc version can be controlled by a -10Vdc/20Vdc reverse-phase system. The actuator head is removable without affecting the integrity of the water system. All actuator versions are interchangeable with any valve body, offering the highest flexibility for boiler production line assembly and maintenance. 3-way valves are suitable for both diverting water from AB to A or to B and from A or B to AB.

Read more about the features and technical specifications in the product handbook, available in PDF, (644 kb)

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Pilot Burners
Pilot Burners are suitable for all gas fired domestic appliances. A pilot burner is an integral part of a gas safety system, working in conjunction with the combination gas valve control and with the safety ignition electronic for intermittent pilot ignition systems. The primary function of a pilot burner is to create and maintain a pilot flame which must be proven within a certain period (thermocouple or ionization current) and then to ignite the main burner from the established flame. The presence of a flame prior to main burner ignition ensures a very reliable burner start because the flame is communicated to the main burner by cross lighting from the pilot flame.


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Thermocouples
Thermocouples Q309A, Q331A and Q335A,C are thermo-electric devices designed for use with Honeywell pilot burners to prove the presence of the pilot flame in gas heating control equipment. When heated by the pilot flame a small DC voltage is generated across the "HOT" and "COLD" junction of the thermocouple, this voltage is used to hold in the power unit in the pilotstat controlling main gas flow to the heating equipment. In the event of pilot flame failure the DC voltage is no longer generated, the power unit drops out and gas flow to the burner equipment shuts off.

Read more about the features and technical specifications in the instruction sheet of thermocouples, available in PDF, (85 kb)

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Aquastats - L41/L61
Honeywell manufactures a comprehensive range of water temperature thermostats (trade name Aquastat) for controlling and limiting boiler water temperature in hydronic heating systems. These sensitive, fast response devices are available in either direct, panel or surface mount versions.

Read more about the features and technical specifications in the product handbook, available in PDF, (815 kb)

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Pressure Sensing Devices - C4065/C6065
The C4065/C6065 differential air pressure switch for forced flue combustion type burner system functions as a (combustion) airflow supervision with a safe start interlock. The C4065/C6065 differential pressure switch is designed to be used on air or combustion products. The C6065AH and C6065FH with enhanced accuracy are according the requirements of high efficiency appliances. The C6065 differential air pressure switch series authorises the boiler to start only when the air flow is sufficient and stops it before toxic gases are expelled.

Read more about the features and technical specifications in the product handbook, available in PDF, (678 kb)

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Pressure Sensing Device - IS Series
The IS Series of pressure sensing switches is designed to be used in gas combustion system appliances, where the combustion air is fully dependant on the fan. Therefore, this air flow must be closely monitored. The IS Series pressure sensing switches adress this need, with a highly reliable and well-proven design. The IS Series offers a proven integrated compression spring and precision snap acting electrical switch. The switches are specifically designed to yield narrow switch differentials, as well as to hold tight setpoint tolerances throughout a wide temperature range.

Read more about the features and technical specifications in the product handbook, available in PDF, sorry not yet available

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