Bulb Shield Protect the Sensing Bulb from Sun and Weather with the Bulb Installed Outdoor

Immersion Well Allow Heat Transfer While Protecting the Sensing Bulb from Contact with the Controlled Medium

Immersion Well Permit Removal of the Sensing Bulb for Testing or Replacement without Draining the System

Immersion Type Controllers that Combine High Limit Protection with Switching Relay Control of Burner and Circulator Motors

High Limit Opens Burner Circuit Only

Select Models Include Transformer and Accessory Terminals for Adding a Remote Low Limit Controller

Immersion Type Controllers that Combine High Limit Protection with Switching Relay Control of Burner and Circulator Motors

High Limit Opens Burner Circuit Only

Select Models Include Transformer and Accessory Terminals for Adding a Remote Low Limit Controller

Case Available for Horizontal or Vertical Mounting

Requires a 24 Volt AC Thermostat with Heat Anticipator Set at 0.2 Ampere

Trade Line Models Include Well Adapter, Tube of Heat Conductive Compound and Range Stops

Immersion Type Controllers that Combine High Limit Protection with Switching Relay Control of Burner and Circulator Motors

High Limit Opens Burner Circuit Only

Select Models Include Transformer and Accessory Terminals for Adding a Remote Low Limit Controller

Case Available for Horizontal or Vertical Mounting

Requires a 24 Volt AC Thermostat with Heat Anticipator Set at 0.2 Ampere

Trade Line Models Include Well Adapter, Tube of Heat Conductive Compound and Range Stops

Immersion Type Controllers that Combine High Limit Protection with Switching Relay Control of Burner and Circulator Motors

High Limit Opens Burner Circuit Only

Select Models Include Transformer and Accessory Terminals for Adding a Remote Low Limit Controller

Case Available for Horizontal or Vertical Mounting

Requires a 24 Volt AC Thermostat with Heat Anticipator Set at 0.2 Ampere

Trade Line Models Include Well Adapter, Tube of Heat Conductive Compound and Range Stops

Use with AQ1000 Two-Wire Communicating Thermostats or Most Dry Contact Digital Thermostats

Offers Zoning Control for up to Four Zones and Controls up to Two Stages of Heat from a Single Thermostat

Can Expand up to 16 Zones with AQ255 or AQ257 or up to 64 Zones with AQ254 Add-A-Temp Panels

Line or Low-Voltage Output for Zoning Equipment, Including Pumps or Valves

Features Zone Synchronization Through the Zone or Greatest Demand Control

Automated Test Feature for Quick Start-Up and Simplified Troubleshooting

Provides Intermediate Switching of a Line and Low Voltage Devices from a Line or Low Voltage Controller and is Typically Applied in Hydronic Heating Systems

Replaceable Socketed Relays

Two Troubleshooting LED

Replaceable Transformer Fuse

Push to Test Button

Low Voltage Contact Rating for PowerPile Applications

Long Life DC Relay Drive Control Technology

Provide Intermediate Switching of a Line Voltage Device from a Low Voltage Controller

Integral Transformer Provides Low Voltage Power For Control Circuit

LCD Screen, Customizable Control Setting, Ability to Display Outdoor Temperature on Thermostat, Programmable Auxiliary Relay to Add System Versatility

Outdoor Reset or Load Reset, 0 to 10 Volt DC Output to Run Modulating Boiler, Support for 1 A/C Compressor and up to 64 Zones of Cooling

The Ability to Control 2-Temperatures with Injection Pump or Mixing Valve