Honeywell, L6006A1145/U, High and Low Limit Aquastat, 5 to 30 deg F

Honeywell L6006A1145/U – Strap-On Aquastat Controller with Fixed Bulb, 100–240°F Range

The Honeywell L6006A1145/U is a line-voltage temperature controller designed for use in hydronic heating systems. This model features a strap-on copper immersion bulb for surface mounting on pipes and tanks, providing control through a snap-acting SPDT switch that responds to temperature rise.

It is commonly applied for high limit, low limit, or circulator control functions, depending on wiring configuration. The adjustable differential and external setpoint dial allow for field customization based on application requirements.

Controller Features

• Control Range: Adjustable from 100°F to 240°F
• Differential: Adjustable from 5°F to 30°F
• Switch Action: SPDT, breaks or makes on temperature rise
• Mounting Method: Surface mount using strap-on sensor (included)
• Sensor Type: Fixed copper bulb – 3/8 in x 2-7/8 in
• Voltage: Suitable for 120 VAC to 240 VAC line-voltage applications
• Electrical Rating: Up to 48 A (resistive), depending on voltage and load
• Setpoint Adjustment: External visible scale for simplified calibration

Technical Specifications

• Model Number: L6006A1145/U
• Application: Temperature regulation and limit control in hydronic piping or tanks
• Installation: Strap-on sensor designed for mounting on 1" to 6" diameter pipes
• Switch Rating: 5.1 A to 48 A resistive, based on application voltage
• Ambient Operating Conditions: Non-condensing, indoor use
• Control Type: Single-function mechanical temperature switch

Installation Requirements

This controller is intended for installation by HVAC professionals. The strap-on bulb must maintain full pipe contact to ensure proper thermal transfer. System wiring should be configured according to control logic—whether for burner cutoff, circulator activation, or system monitoring. All installations must comply with applicable electrical and mechanical codes.

Typical Applications

• Circulator control in looped hydronic systems
• Low limit operation for domestic water systems
• High temperature safety shutoff