Aquastat is designed to thermostatically turn any B&G NBF circulator ON and OFF. The AQ-1/2 or AQ-3/4 will switch the pump OFF at 120°F (48.9°C) and ON at 100°F (37.8°C). The aquastats are available in separate models that will sense the temperature for either 1/2” or 3/4” copper pipe.

AUTOMATIC TIMER KIT and AQUASTAT COMBINATION – The automatic timer and aquastat kits can be used in combination. When they are used together, the pump will only circulate water when the ON time conditions are met and when water temperature is low enough to cause the aquastat to switch ON.

Features and Benefits

Thermostatic Switch Modes: OFF (open) at 120°F (48.9°C) water temperature and ON (closed) at 100°F (37.8°C) water temperature.
Thermostatic Element: Bimetal, senses surface temperature of outside diameter of pipe.
Pipe Size: AQS-1/2 clips onto 1/2″ copper pipe or 3/8″ steel pipe (OD of pipe 5/8″). AQS-3/4 clips onto 3/4″ copper pipe or 1/2″ steel pipe (OD of pipe 7/8″).

Mounting: May be installed to sense temperature at the suction or discharge pipe of the pump.
Thermostat Covering: Epoxy (Environmentally Sealed)
Pipe Clip: Stainless Steel
Sensing Element: Bimetal
Wire Leads: Insulated 18″ (457mm) #18 AWG
UL approved.
Connects to the lead wires in the connection box of any Bell & Gossett NBF/NRF/SSF circulator.
Suitable for 115/120V, 60 HZ operation.
Provides thermostat control to the circulator. It will turn OFF (open) at 120°F (48.9°C) water temperature and ON (closed) at 100°F (37.8°C) water temperature.

Bell & Gossett offers several useful engineering tools for easy sizing of every area of a building. Simple to navigate software gives you accurate information and up-to-date documentation downloadable straight into your submittal package.
Some tools require a registered account: New User Registration | Existing User Password Help
ESP-Design PlusBell & Gossett: Multi-Stage, Pressure Booster Packages, Wastewater, Vertical Turbines
ESP-PlusBell & Gossett Pump Selection: Circulators, End Suction, Closed-Coupled, Inline, Double Suction
ESP-TanksBell & Gossett Compression/Expansion Tanks and Accessories (downloadable app)
ESP-ThermalBell & Gossett Gasket Plate & Frame and, Brazed Plate Heat Exchangers
ESP-UTUBEBell & Gossett U-Tube Heat Exchangers
ESP-PartsParts Selection
Steam-2000Steam 2000 Selection
Steam-1140Series 1140 Steam Service Regulators
Water-1140Series 1140 Water Service Regulators
Steam-TrapsSteam Traps Selection
CAD DrawingsCAD Drawings
System SyzerSystem Syzer (available online, PC download, and iOS app)
System Syzer PsychrometrySystem Sizing related to coil cooling (link downloads .exe file)
Steam-PipeSteam Pipe Sizing
Steam-LossSteam Loss Through Failed Trap
Flash-SteamFlash Steam Sizing
Condensate-PipeCondensate Pipe Sizing
Mobile Catalog iOSiPhone & iPad Mobile Product Catalog
Mobile Catalog AndroidAndroid Device Mobile Product Catalog

Bell & Gossett is a leading manufacturer of pumps, valves, heat exchangers, and accessories for plumbing, wastewater, and HVAC—including steam and heat transfer—applications. To build and operate an efficient water system, you need both the right products and experts who know the application. Here, you can access Bell & Gossett’s trusted network of partners who have the experience you need to get the job done right.

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