L8124E1016/U High Limit Protection, Low Limit and Circulation Control Triple Aquastat Relay

Part Number: L8124E1016/U Brand: Resideo Technologies Inc

High Limit Protection, Low Limit and Circulation Control Triple Aquastat Relay

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Immersion-type controllers that combine high limit protection with low limit and circulator control in forced hydronic heating systems, including domestic hot water service.
  • Immersion-type Controllers that Combine High Limit Protection with Low Limit and Circulator Control in Forced Hydronic Heating Systems.
  • Provide Multizone Control by Using a Separate Circulator and R845 Relay for Each Zone.
  • Include Diaphragm Powerhead and Micro Switch™ Assembly that Respond to Temperature Changes in Boiler Water.
  • Mount Directly to Boiler.
  • Select Models Include Large Transformers and Extra Terminals for Supplying Power to Low Voltage Zone Valves.
  • Require 24 Vac Thermostat with Heat Anticipator Set at 0.2 A - Plus Current Draw of Gas Valve on L8124E.
  • Tradeline Models Include Tube of Heat Conductive Compound and Range Stops.


Hazmat Information

  • UN 1294, TOLUENE, 3, II


  • 6-1/8 in. high x 4-3/8 in. wide x 3-1/16 in. deep
  • 156 mm high x 111 mm wide x 78 mm deep

Maximum Safe Operating Pressure

  • 200 psi on outside of immersion well, 100 psi on capsule if inserted directly.
  • 1378 kPa on outside of immersion well, 690 kPa on capsule if inserted directly.

Temperature Range

  • -30 °F to 150 °F at switches; 265 °F at sensing element
  • -34 °C to 66 °C at switches; 129 °C at sensing element


  • Vertical Mount


  • 60 Hz

Electrical Connections

  • Quick-Connect / Screw

Operating Humidity Range

  • 0 to 95% RH, non-condensing


  • 120 Vac

Operating Temperature Range

  • High Limit: 130 °F to 240 °F; Low Limit: 110 °F to 220 °F
  • High Limit: 54 °C to 116 °C; Low Limit: 43 °C to 104 °C

Differential Temperature

  • High limit: 10 °F fixed; low limit: 10 to 25 °F adj.

Switching Action

  • SPST: High & Low Limit

Electrical Ratings, Burner

  • 1.25A at 24 Vac; 30 VA (total load) Terminals B1-B2 and TV-Z

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

  • Triple Aquastat Relay with High Limit

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