Name: Resideo L4080B1352/U Immersion Type Aquastat
Brand: Resideo
SKU: HONE-L4080B1352/U
Price: 94.59 USD
Availability: InStock

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Electrical Ratings	Millivolt--0.25 A @ 0.25 to 12 Vdc; At Full Load-- 8A @ 120 Vac: 4A @ 240 Vac; At Locked Rotor-- 48A @ 120 Vac: 24A @ 240 Vac
Operating Temperature	100 F to 200 F
Mounting	Mount using 1/4 in. NPT female threads or surface mount through base of case
Application	Immersion type controllers for hydronic heating systems that turn off the burner whenever the boiler water temperature rises to the set point.
Includes	Siphon Loop
Dimensions	Insertion depth: 3 in.
UL	UL Listed: -models with well, File No. MP466, Guide No. MBPR, -models less well, File No. MP466, Guide No. MBPR2
AGA	AGA Design Certified: Test Report 23-11B
Hazmat Information	Dangerous Goods in Excepted Quantities
Temperature Range (F)	Maximum--40 F above setpoint or 265 F, which ever is lower.
Differential Temperature (F)	8 F
Switching Action	Breaks contact on temperature rise to set point.
Insulation Depth (in.)	1 1/2 in. to 3 in.

The L4080B1352 is a control from Resideo (Honeywell Home) that senses boiler water temperature and switches the burner, the circulator, or both. It operates over the range printed on the control.

The aquastat is the control that keeps a hydronic boiler inside its working band. It holds the water hot enough to serve a call for heat and shuts the burner down before the boiler reaches a temperature the relief valve would have to handle.

When you replace an aquastat, match the temperature range, the switch action and the differential to the control coming out, not to the boiler nameplate. A boiler will happily run on a control with the wrong range — it will simply cycle badly, or trip a limit that was never meant to be the working control.

The sensing bulb belongs in an immersion well, filled with heat conductive compound, threaded into the tapping the boiler manufacturer provided for it. A bulb strapped to the outside of a pipe reads the pipe, not the water, and it reads it late.

Brand: Resideo (Honeywell Home)
Manufacturer Part #: L4080B1352/U
UPC: 085267153713
Category: Aquastats & Wells

Full Specifications

Application	Immersion Type Controllers for Hydronic Heating Systems
Approvals and Standards	UL Listed: models with well, File No. MP466, Guide No. MBPR, AGA Design Certified: Test Report 2311B
Color	Gray
Compatible With	Hot Water, Hydronic Heating Systems
Includes	Siphon Loop
Mounting Type	Surface mount through base of case
Differential Temperature	8 F, 4.4 C
Operating Temperature (Min)	100 °F, 38 °C
Operating Temperature (Max)	200 °F, 93 °C
Electrical Ratings at Full Load	8A @ 120 V AC, 4A @ 240 V AC
Electrical Ratings at Locked Rotor	48A @ 120 V AC, 24A @ 240 V AC
Electrical Ratings Millivolt	0.25 A @ 0.25 to 12 Vdc
Element Insertion Length	3 in., 76.2 mm
Product Height	3.88 in
Product Length	2.5 in
Product Width	2 in
Hazmat Information	Dangerous Goods in Excepted Quantities