Name: Resideo L8148A1017/U Aquastat Relay, 140 to 240 F Range with 8 Degree F Fixed Differential, Low Volt/Millivolt
Brand: Resideo
SKU: HONE-L8148A1017/U
Price: 293.51 USD
Availability: InStock

Aquastat Relay, 140 to 240 F range with 8 degree F fixed differential, low volt/millivolt

Resideo Aquastat Relay, 140 to 240 F range with 8 degree F fixed differential, low volt/millivolt

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Voltage	120 Vac
Frequency	60 Hz
Electrical Connections	Quick-Connect / Screw
Operating Temperature	High Limit-- 140 F to 240 F
Operating Humidity	0 to 95% RH, non-condensing
Mounting	Horizontal
Application	High Limit
Dimensions	4 5/16 in. high x 6 1/8 in. wide x 3 1/8 in. deep
UL	UL Listed: File No. MP466, Vol. 13, Sec. 2, Guide No. MBPR2.
CSA	Certified: File No. LR1620, Guide No. 400-E-O
Hazmat Information	Dangerous Goods in Excepted Quantities
Maximum Safe Operating Pressure (psi)	Immersion Well: 255 psi
Temperature Range (F)	Maximum--150 F with 1.2 A 24 V load; 77 F with 1.4 A 24 V load
Differential Temperature (F)	8 F fixed
Switching Action	SPST: High Limit & Circulator
Anticipator Setting	0.2 A
Capillary Length (in.)	4 1/2 in.
Insulation Depth (in.)	1 1/2 in. to 3 in. less well
Electrical Ratings, Burner	At Full Load-- Low Voltage: 0.8 A max. @ 24 Vac: Line Voltage: 7.4 A @ 120 Vac: 3.7 A @ 240 Vac; At Locked Rotor-- Line Voltage: 44.4 A @ 120 Vac: 22.7 A @ 240 Vac
Electrical Ratings, Circulator	At Full Load-- 7.4 A @ 120 Vac: 3.7 A @ 240 Vac; At Locked Rotor-- 44.4 A @ 120 Vac: 22.2 A @ 240 Vac

The L8148A1017 is a relay from Resideo (Honeywell Home) that senses boiler water temperature and switches the burner, the circulator, or both. It operates over a 140–240 °F range with a fixed differential.

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.

The differential is factory fixed, which removes one setting from the commissioning process and one thing for a future service call to get wrong.

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 #: L8148A1017/U
Temperature range: 140–240 °F
Differential: Fixed
UPC: 085267055086
Shipping weight: 3.0 lb
Category: Aquastats & Wells

Full Specifications

Application	Aquastat Relay with High Limit Control
Product Features	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 Vac thermostat with heat anticipator set at 0.2A., TRADELINE models include well adapter, tube of heat conductive compound and range stops..
Approvals and Standards	UL Listed (models with well): File No. MP466, Guide No. MBPR, CSA Certified: File No. LR1620, Guide No. 400-E-O
Color	Gray
Compatible With	Hot Water, Hydronic Heating Systems
Mounting Type	Horizontal Mount
Differential Temperature	8 °F Fixed
High Limit Set point Temperature (Min)	140 °F, 60 °C
High Limit Set point Temperature (Max)	240 °F, 116 °C
Electrical Connection Type	Quick-Connect / Screw
Electrical Ratings at Full Load	7.4 A at 120 V AC, 3.7 A at 240 V AC
Electrical Ratings at Locked Rotor	44.4 A at 120 V AC, 22.2 A at 240 V AC
Electrical Ratings Millivolt	At Locked Rotor-- 0.25 A at 1/4 to 12 V DC
Operating Frequency	60 Hz
Operating Pressure (Max)	255 psi Immersion Well, 1757 kPa Immersion Well
Operating Voltage	120 V AC
Type of Fuel	Oil
Switch Type	SPST: High Limit and Circulator
Insulation Depth	1 1/2 in to 3 in less well
Capillary Length	4 1/2 in
Product Height	4.31 in, 110 mm
Product Length	6.13 in, 156 mm
Product Width	3.06 in, 78 mm
Hazmat Information	Dangerous Goods in Excepted Quantities