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| Application | High or Low limit |
|---|---|
| Approvals and Standards | UL Listed: Models with well, File No. MP466, Guide No. MBPR|UL Listed: models less well, File No. MP466, Guide No. MBPR2|Certified: File No. LR1620, Guide No. 400-E-O|AGA Design Certified: Test Report 23-11B |
| Color | Gray |
| Compatible With | Hot Water|Hydronic Heating Systems |
| Includes | Siphon Loop |
| Differential Temperature | 8 °F|4.4 °C |
| Operating Temperature (Min) | 140 °F|78 °C |
| Operating Temperature (Max) | 240 °F|133 °C |
| Electrical Ratings at Full Load | 8 A @ 120 V AC|5.1 A @ 240 V AC |
| Electrical Ratings at Locked Rotor | 48 A @ 120 V AC|30.6 A @ 240 V AC |
| Electrical Ratings Millivolt | 0.25 A @ 0.25 to 12 V DC |
| Switch Action | Contacts break on temperature rise |
| Switch Type | SPST |
| Insulation Depth | 1.5 in|38 mm |
| Ambient Temperature (Max) | 40 °F above setpoint or 265 °F, which ever is lower |
| Hazmat Information | UN1294, Dangerous Goods in Excepted Quantities |
Automatic Burner Shutoff
The High Limit Aquastat Controller from Resideo is ideal for hydronic heating systems turning off the burner whenever the boiler water temperature rises to the adjustable set point—to optimize safety.
This controller is 1 in. x 1 in. x 1 in. and is rated at 100-200 degrees F with an 8 degree F fixed differential.
Features include:
- Immersion type controller
- Adjustable set point
- Models available for immersion wells or direct immersion
- Insertion depth is 1 1/2 to 3 in
- Models available with second limit switch to shut off all gas to the burner
- Liquid fill in sensing element expands as the boiler temperature rises
- At the set point temperature, a diaphragm-actuated snap switch breaks the power supply to the burner primary control
- Includes a siphon loop
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