Name: Resideo L4008A1015/U High or Low Limit Aquastat Controller with 100 F to 240 F Operating Temperature
Brand: Resideo
SKU: HONE-L4008A1015/U
Price: 225.06 USD
Availability: InStock

High or low limit Aquastat controller with 100 F to 240 F operating temperature

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Electrical Ratings	Millivolt--0.25 A @ 0.25 to 12 Vdc; At Full Load-- 8A @ 120 Vac: 5.1A @ 240 Vac; At Locked Rotor-- 48A @ 120 Vac: 30.6A @ 240 Vac
Operating Temperature	100 F to 240 F
Mounting	Horizontal or Vertical
Application	High or Low limit
Includes	5 1/2 ft (1.7 m) capillary
Dimensions	Case--5 5/8 in. high x 2 in. wide x 2 1/8 in. deep
UL	UL Component Recognized: File No. MP466, Vol. 6, Sec.1, Guide No. MBPR2
CSA	Certified: File No. LR95329-1
Hazmat Information	Dangerous Goods in Excepted Quantities
Temperature Range (F)	Maximum Ambient--150 F
Bulb Size (in.)	3/8 in. x 2 7/8 in. copper
Differential Temperature (F)	5 F to 30 F adj.
Switching Action	SPST, contacts break on temperature rise.
Capillary Length (in.)	66 in.

The L4008A1015 is a control from Resideo (Honeywell Home) that senses boiler water temperature and switches the burner, the circulator, or both. It operates over a 100–240 °F range.

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 #: L4008A1015/U
Temperature range: 100–240 °F
Category: Aquastats & Wells

Full Specifications

Application	High or Low Limit Control
Color	Gray
Compatible With	Hot Water, Hydronic Heating Systems
Includes	5 1/2 ft (1.7 m) Capillary
Operating Temperature (Min)	100 °F, 38 °C
Operating Temperature (Max)	240 °F, 116 °C
Capillary Length	66 in
Product Height	5.63 in
Product Length	2 in
Product Width	2.13 in
Hazmat Information	Dangerous Goods in Excepted Quantities