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Honeywell L4006E1000/U High Limit Manual Reset Aquastat Controller with 1/2" well

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Aquastat® Controllers from Resideo are immersion type devices for limiting or regulating the temperature of liquids in boilers, storage tanks, and other applications where temperature control is required. L4006 are used in applications that utilize the existing wells



  • Totally enclosed Micro Switch™ snap-acting switches operate on temperature rise to setpoint.
  • Visible control point scale and external adjustment screw permit easy setting.
  • Horizontal or vertical insertion of the sensing element.
  • Direct or well immersion of the sensing element.
  • Models available for strap-on mounting.
  • Remote bulb model may be used to sense air temperature in ducts and in outside air sensing applications.
  • Models include heat-conductive compound.
  • Select models have wells.
  • UL limit rated device.


Product Specifications

Hazmat Information
UN 1294, TOLUENE, 3, II
High Limit; Manual Reset
Dimensions (in.)
Case--5 5/8 in. high x 2 in. wide x 2 1/8 in. deep
Dimensions (mm)
Case--143 mm high x 51 mm wide x 54 mm deep
Temperature Range (F)
Maximum--150 F
Temperature Range (C)
Maximum--66 C
Stop factory-set at 250 F (121 C)
Horizontal or Vertical
Electrical Ratings
Millivolt--0.25 A @ 0.25 to 12 Vdc; At Full Load-- 8A @ 120 Vac: 1.3A @ 240 Vac; At Locked Rotor-- 48A @ 120 Vac: 30.6A @ 240 Vac
Approvals, Underwriters Laboratories Inc.
UL Component Recognized: File No. MP466, Vol. 6, Sec.1, Guide No. MBPR2
Approvals, Canadian Standards Association
Certified: File No. LR95329-1
Operating Temperature Range (F)
130 F to 270 F
Operating Temperature Range (C)
54 C to 132 C
Bulb Size (in.)
3/8 in. x 2 7/8 in. copper
Bulb Size (mm)
10 mm x 73 mm copper
Differential Temperature (F)
Manual Reset
Differential Temperature (C)
Manual Reset
Switching Action
SPST, contacts break on temperature rise.
Approvals, American Gas Association
AGA Certified
Capillary Length (in.)
1 1/2 in.
Well Spud Size (in.)
1/2 in.
Well Spud Size (mm)
13 mm
Capillary Length (mm)
38 mm

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