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Resideo PA404A is a pressure actuated high limit, safety control for steam heating boilers. It breaks an electrical circuit to shut down the burner if steam pressure rises above a safe level.

The PA404B is used with suspension-type unit heaters to make the fan circuit when a pressure rise indicates the presence of steam.

Each model contains an SPST MICRO SWITCH snap-acting switch.Sensitive pressure-actuated diaphragm expands or contracts with pressure variations, moving a lever mechanism which operates the snap switch.

A screw on top of the case allows set point adjustment without removing the cover.Differential is adjusted by means of a dial located inside the case

Dwyer Instruments A-301 Static Pressure Tip 1/4" Metal Tubing 4" Insertion Depth 1/4" Compression

Dwyer Instruments A-302 Static Pressure Tip 3/16 Metal Tubing 4" Insertion Depth 1/8" Compression

Sealed Unit Parts ES1024STL Sail Switch W/Metal Plunger,

E.S.P Company DFS-221-112 Air Flow Switch 120-277 VAC 1/2 psi Maximum Pressure

At AprilAire, our mission has always been to make homes healthy through intuitive design and professional-grade solutions because healthy homes are the foundation for healthy people, families, and communities.

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Our Healthy Air solutions are designed to be intuitive, easy to use, and environmentally friendly.

Our work is fueled by a passion for making a Healthy Air difference.

We're committed to delivering real results through dedication to our customers and solutions that perform.

Frost Sensor used on Model 1750A & 1770A Dehumidifiers

Robertshaw C901-45 Temperature Control -35/15F SPST

The F261 series flow switches respond to fluid flow in lines carrying water, ethylene glycol, or other nonhazardous fluids. These models also work in applications with swimming pool water and lubricating oils. F261 series standard flow switches use a variety of paddle sizes to respond to fluid flow rates in applications with pipe sizes greater than 1" trade size.

1, 2, 3, and 6" stainless steel paddles, lock-tooth washer and stainless steel paddle screw supplied uninstalled
• Electronic independently mounted control
• Mounting to sensed media vessel/orientation
• Type 1.C (micro interruption) action
• Pollution degree 4, 2
• 4000 VAC impulse voltage
• 266 deg F enclosure, 252 deg F switch component ball pressure temperature
• 3-color coded screw terminals and 1-ground terminal wiring connections
• One 7/8" hole for 1/2" trade size (or PG16) conduit connection
  

Mcdonnell & Miller FS4-3 General Purpose Liquid Flow Switch, 120/240 VAC at 50/60 Hz, 2 SPDT, 160 psi

Universal design serves the widest variety of applications
• Replacement for common flow switches from johnson/penn, potter/taco, watts, hydrolevel and other manufacturers
• Two electrical knock-outs allows connection from either end
• Sensitivity adjusting screw makes flow adjustment easy
• Hardened stainless steel bearings minimize friction
• Sealed monel bellows
• Materials of construction suitable for corrosive liquids
• Includes: (4) 1, 2, 3 and 6" stainless steel paddles
  

Application
The Taco LeakBreaker is installed on the incoming cold water supply to the water heater, shutting off the water to a leaking water heater. The plumb and plug design is specifically engineered for use on a new or retrofit installation. Components are pre-wired to simplify the installation process, just plug in the sensor, valve, power supply and/or batteries. LeakBreaker can be tested anytime and then be reset to guard against a future leak. The LeakBreaker with eLink® technology uses Wi-Fi® to send alerts via email or text. Notifications will be sent when the device detects status changes for the following: alarm activation, AC or battery power, sensor and valve connection, and module connectivity.

Johnson Controls P32AF-1 Closed Differential Adjustable Set Point Sensitive Pressure Switch 24 - 277 VAC, SPDT, 0.05 - 5" WC, 0.018 - 0.12" WC Differential

Honeywell S688A1007 Polyester Film 10" Switch with 5" Sail, SPDT

Activates an electronic air cleaner, a humidifier, or other equipment in response to airflow from the system fan
• Mounted in the return air duct where the sail will be in the direct path of an unrestricted air stream
• Polyester film sail mounted on a micro switch snap switch
• Removable spring counterbalances sail to allow mounting in either vertical (up or down) or horizontal air flow
• Simplified installations with multi-speed fans, inaccessible air handlers, fan motors with voltage or phase different from controlled equipment, eliminated wiring to system fan
• Top and bottom conduit knockouts for wiring convenience
• Low air velocity switch operation makes at 250 fpm and breaks at 75 fpm
• 10" insertion
• 26.2 sq-inch area sail