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ActionsProvide Operating Control with Automatic Limit Protection for Pressure Systems up to 300 PSI
Models have Snap-Acting Switching to Open or Close a Circuit on Pressure Rise
Have Adjustable Differentials
Ground Screw Terminal
The 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
15 Foot Lead Length is Used to Control Floor Temperatures of In-Floor Radiant Heating Application
Two-wire polarity-insensitive non-programmable network communicating thermostat
User buttons feature liquid crystal display as well as outdoor, indoor and floor temperature displays
Floor temperature sensing with minimum and maximum limits (when used with optional AQ12C20 Slab/Floor Sensor (sold separately))
Selectable temporary and permanent backlight
Simplify the wiring process
Easy to follow PC board and secure screw terminal layout eliminates problems caused by incorrect wiring
External indicator lights confirm operation sequence and diagnostic feedback
The unit includes two built-in 40 Volt Amp transformers, Extra fuses provided
This 3-Wire Thermostat Offers System Set-Up Capabilities with Simple, Easy-To-Use Menus
There is a Reduced Operating Mode which May be Used for Nighttime and Vacation Periods
With the Optional Floor Sensor this Thermostat Can Regulate Either the Floor or the Room Temperature or Both in that Case the Floor Sensor is Used as a Temperature Limiter, Either High or Low Limit
Thermostat May Also be Used to Control Relays and Other Low Voltage Controls
This Thermostat Uses Silent Operation Electronic Triac Output
Straight configurations can be installed onto radiators or within the system, for branch or main venting functions (multiple vents may be required for this type of installation)
Durable chrome-plated finish is both decorative and functional
all configurations are plated and are more resistant to moisture staining than unplated vents
Straight configurations can be installed onto radiators or within the system, for branch or main venting functions (multiple vents may be required for this type of installation)
Durable chrome-plated finish is both decorative and functional
all configurations are plated and are more resistant to moisture staining than unplated vents
Angle configurations are typically Installed at the top of a steam radiator, for the purpose of venting trapped air by means of steam displacement
Durable chrome-plated finish is both decorative and functional
all configurations are plated and are more resistant to moisture staining than unplated vents
The adjustable T-90A is capable of slow, medium or fast venting, to accommodate extreme variations in room temperatures, such as colder rooms with radiators located farthest from the boiler, to hotter rooms with radiators located closest to the boiler
No Clog Vent
Dirt and Debris Resistant
360 Degree Adjustable Collar Ring for Installation Flexibility
Stainless Steel Concentrator Which Eliminates Gurgling Noise
Bronze Body for Rigid Construction
Guarantees Fast Start up with Automatic Venting
Micro-Bubble Concentrator has Three Times the Impact Area of Other Products
Helps Prevent Corrosion of System Components
Improves System Efficiency
Made in USA
No Clog Vent
Dirt and Debris Resistant
360 Degree Adjustable Collar Ring for Installation Flexibility
Stainless Steel Concentrator Which Eliminates Gurgling Noise
Bronze Body for Rigid Construction
Guarantees Fast Start up with Automatic Venting
Micro-Bubble Concentrator has Three Times the Impact Area of Other Products
Helps Prevent Corrosion of System Components
Improves System Efficiency
Made in USA
No Clog Vent
Dirt and Debris Resistant
360 Degree Adjustable Collar Ring for Installation Flexibility
Stainless Steel Concentrator Which Eliminates Gurgling Noise
No Clog Vent
Dirt and Debris Resistant
360 Degree Adjustable Collar Ring for Installation Flexibility
Stainless Steel Concentrator Which Eliminates Gurgling Noise
Bronze Body for Rigid Construction
Guarantees Fast Start up with Automatic Venting
Micro-Bubble Concentrator has Three Times the Impact Area of Other Products
Helps Prevent Corrosion of System Components
Improves System Efficiency
Made in USA
No Clog Vent
Dirt and Debris Resistant
360 Degree Adjustable Collar Ring for Installation Flexibility
Stainless Steel Concentrator Which Eliminates Gurgling Noise
Bronze Body for Rigid Construction
Guarantees Fast Start up with Automatic Venting
Micro-Bubble Concentrator has Three Times the Impact Area of Other Products
Helps Prevent Corrosion of System Components
Improves System Efficiency
Made in USA
No Clog Vent
Dirt and Debris Resistant
360 Degree Adjustable Collar Ring for Installation Flexibility
Stainless Steel Concentrator Which Eliminates Gurgling Noise
Bronze Body for Rigid Construction
Guarantees Fast Start up with Automatic Venting
Micro-Bubble Concentrator has Three Times the Impact Area of Other Products
Helps Prevent Corrosion of System Components
Improves System Efficiency
Made in USA
Directional Flow Arrow for Correct Installation
Honeywell AP400 Series Air Purgers Provide Air and Water Separation in Hydronic Heating Systems, Improving Efficiency and Reducing Noise
Solidly Constructed of Cast Iron
The Air Purgers Feature Tappings for Expansion Tank and Auto Air Vent Mounting
Directional Flow Arrow for Correct Installation
Directional Flow Arrow for Correct Installation
Front Diagnostic Lights
Switchable Priority
Built-In Priority Protection
Simplified Wiring
Premium Sealed Relays
Compact Design
Fuse Protected
100 Percent Factory Tested
Isolated End Switch
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
24 Volt Power Output for Hard Wired Thermostats
Field Replaceable Transformer
Add-On Power Control Plug
Built-In Post Purge and Pump Exercise Functions
Switchable Primary Circulator Output
Two Boiler Contacts, Utilizes Full Functionality of Mod-Con Boilers
Expandable to 20 Zoning Panels
Interface with EXP Zone Valve Controls
UL Approved
Made in USA
Front Diagnostic Lights
Switchable Priority
Built-In Priority Protection
Simplified Wiring
Premium Sealed Relays
Compact Design
Fuse Protected
100 Percent Factory Tested
Isolated End Switch
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
24 Volt Power Output for Hard Wired Thermostats
Field Replaceable Transformer
UL Approved
Made in USA
Front Diagnostic Lights
Switchable Priority
Built-In Priority Protection
Simplified Wiring
Premium Sealed Relays
Compact Design
Fuse Protected
100 Percent Factory Tested
Isolated End Switch
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
24 Volt Power Output for Hard Wired Thermostats
Field Replaceable Transformer
UL Approved
Made in USA
Front Diagnostic Lights
Switchable Priority
Built-in Priority Protection
Simplified Wiring
Premium Sealed Relays
Compact Design
Fuse Protected
100% Factory Tested
Isolated End Switch
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
24 Volt Power Output for hard wired thermostats
Field Replaceable Transformer
Front Diagnostic Lights
Switchable Priority
Built-in Priority Protection
Simplified Wiring
Premium Sealed Relays
Compact Design
Fuse Protected
100% Factory Tested
Isolated End Switch
Contractor Friendly PC Board Layout
Universal Thermostat Compatibility
24 Volt Power Output for hard wired thermostats
Field Replaceable Transformer