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Description
Immersion-type controllers that combine high limit protection with low limit and circulator control in forced hydronic heating systems, including domestic hot water service.

Features
  • 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).

Product Specifications
Description :High Limit Protection, Low Limit and Circulation Control Triple Aquastat Relay with High limit : 10 F fixed low limit: 10-25 F adj. Differential
Application : High Limit Protection, Low Limit and Circulation Control
Operating Range, Low Limit (F) : 110 F to 220 F adj.
Operating Range, Low Limit (C) : 43 C to 104 C adj.
Operating Range, High Limit (F) : 130 F to 240 F adj.
Operating Range, High Limit (C) : 54 C to 116 C adj.
Differential Temperature (F) : High limit : 10 F fixed; low limit: 10-25 F adj.
Maximum Operating Pressure (psi) : 200 psi on outside of immersion well, 100 psi on capsule if inserted directly.
Maximum Operating Pressure (kPa) : 1378 kPa on outside of immersion well, 690 kPa on capsule if inserted directly.
Electrical Ratings (burner AFL) : 7.4 A @ 120 Vac
Electrical Ratings (burner AFL) : 3.7 A @ 240 Vac
Electrical Ratings (burner ALR) : 44.4 A @ 120 Vac
Electrical Ratings (burner ALR) : 22.2 A @ 240 Vac
Electrical Ratings (circulator AFL) : 7.4 A @ 120 Vac
Electrical Ratings (circulator AFL) : 3.7 A @ 240 Vac
Electrical Ratings (circulator ALR) : 44.4 A @ 120 Vac
Electrical Ratings (circulator ALR) : 22.2 A @ 240 Vac
Voltage : 120 Vac
Dimensions (in.) : 6 1/8 in. high x 4 3/8 in. wide x 3 1/16 in. deep
Dimensions (mm) : 156 mm high x 111 mm wide x 78 mm deep
Insulation Depth (in.) : 1 1/2 in.
Insulation Depth (mm) : 38 mm
Mounting : Vertical Mount
Operating Humidity Range (% RH) : 0 to 95% RH, non-condensing
Maximum Ambient Temperature (F) : 150 F at switches, 265 F at sensing element.
Maximum Ambient Temperature (C) : 66 C at switches, 129 C at sensing element.
Approvals, Underwriters Laboratories Inc : UL Listed (models with well): File No. MP466, Guide No. MBPR UL Component Recognized (models without well): File No. MP466, Guide No. MBPR2
Approvals, Canadian Standards
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Manuals (2)
Specs
Application:
Circulator Control
Low Limit
Triple Aquastat Relay
High Limit
Temperature Range (F):
130°F to 240°F
110°F to 220°F
Electrical Rating:
Burner: 7.4 A @ 120 Vac
Burner: 3.7 A @ 240 Vac
Circulator: 7.4 A @ 120 Vac
Electrical Ratings (ALR):
Circulator: 44.4 A @ 120 Vac
Max Temp Differential:
10°F
Differential:
10° to 25°F (Low Limit)
Max Temp Differential:
25°F
Min Temp Differential:
10°F
Differential:
Adjustable
Fixed
Height:
6-1/8"
Width:
4-3/8"
Depth (Inches):
3-1/16"
Operating Humidity:
0% to 95% (non-condensing)
Max Ambient Temp (°F):
265 F at Sensing Element
150 F at Switches
Mount:
Vertical
Voltage:
120v
Max Pressure (PSI):
200 psi on Immersion Well
100 psi Direct Immersion
Max Temp (F):
240°F
Min Temp (F):
110°F
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