| 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 |
Description
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