Description
Resideo L4006A1967 Aquastat Controller | 100–240°F | High/Low Limit | 5–30°F Adj Differential | SPST Switch | 1-1/2" Well Included
The Resideo L4006A1967 is a high- or low-limit Aquastat Controller designed for hydronic heating systems, boilers, and storage tanks requiring precise temperature regulation. This immersion-type controller includes a factory-installed 1-1/2" deep well and features adjustable temperature differential, flexible mounting options, and robust electrical ratings for reliable system performance.
Key Features
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Immersion-Type Control – For limiting or regulating liquid temperatures in boilers and tanks
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Adjustable Differential – Field-settable from 5°F to 30°F
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Clear Adjustment Scale – External screw with visible control point scale
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SPST Snap-Acting Switch – Breaks circuit on temperature rise
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Flexible Mounting – Horizontal or vertical bulb insertion
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Includes Well – 1-1/2" (38 mm) deep well with 1/2" NPT male spud
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UL Rated – Certified for safety and performance (UL, CSA, AGA)
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Factory Stop Set at 240°F – Provides high-limit protection
Specifications
| Attribute | Value |
|---|---|
| Application | High Limit / Low Limit |
| Temperature Range | 100°F – 240°F |
| Differential | Adjustable, 5°F – 30°F |
| Switch Action | SPST (Break on Temp Rise) |
| Capillary Length | 1-1/2" |
| Bulb Size | 3/8" x 2-7/8" |
| Well Spud Size | 1/2" NPT (Male) |
| Well Included | Yes |
| Mounting | Vertical / Horizontal |
| Thread Type | Male |
| Max Ambient Temp | 150°F |
| Electrical Ratings | 0.25 A @ 0.25–12 VDC 8 A @ 120 VAC 5.1 A @ 240 VAC |
| Electrical Ratings (ALR) | 48 A @ 120 VAC 30.6 A @ 240 VAC |
| Voltage | 120/240V |
| Height | 5-5/8" |
| Width | 2" |
| Depth | 2-1/8" |
| Approvals | UL, CSA, AGA Certified |
Applications
Perfect for hydronic heating systems, hot water storage tanks, and industrial liquid temperature control, the Resideo L4006A1967 provides accurate and reliable performance in demanding environments.