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Honeywell L4081, L6081 Multiple Aquastat® Controllers

Honeywell
Multiple Aquastat® Controllers
L4081, L6081

High limit, low limit and/or circulator controllers used to regulate boiler water temperature in gas- or oil-fired hydronic heating systems.

• An immersion type liquid-filled sensing element actuates two snap switches.
• One switch operates as a high limit control.
• The other switch operates as a low limit and/or circulator control, depending on the model.
• Controller may be mounted in any positioning and needs no leveling.
• Separate, easy-to-read, calibrated dial and setpoint adjustments for each switch.
• Differential adjustment on low limit or circulator switch.
• All adjustments accessible inside front cover.
• Push-in terminals for quick connecting.
• Single sensing element for easy installation.
• One SPST and one SPDT snap switches act independently at respective temperature settings.

Select a link under the "item" tab below to order.

ItemApplication:Differential Temperature (F)Insulation Depth (inch)Spud Size (inch)Switching ActionMountingIncludes
L4081A1023High and Low limitHigh limit: 10 F fixed; low limit: 10-25 F adj.1 1/2 in.3/4 in. - 14 NPTSPST: High & Low LimitHorizontal
L4081B1013High Limit and Circulator10 F fixed3 in.3/4 in. - 14 NPTSPST: High Limit & CirculatorHorizontal
L4081B1047High Limit and CirculatorHigh limit: 10 F fixed; low limit: 10-25 F adj.1 1/2 in.3/4 in. - 14 NPTSPST: High Limit & CirculatorHorizontal
L4081B1096High Limit and Circulator10 F fixed3 in.SPST: High Limit & CirculatorHorizontal
L6081A1010High and Low limit10 F fixed3 in.3/4 in. - 14 NPTHorizontal3 in. insertion well.
L6081A1036High and Low limitHigh limit: 10 F fixed; low limit: 10-25 F adj.1 1/2 in. to 4 in.3/4 in. - 14 NPTHorizontal
Dimensions, Approximate: 3 7/8 in. high x 4 1/8 in. wide x 2 3/4 in. deep (98 mm high x 105 mm wide x 70 mm deep.)
Electrical Ratings: Transformer Load: 360 VA
Maximum Ambient Temperature: 150 F at switches; 265 F at sensing element (66 C at switches; 129 C at sensing element)
Operating Range, High Limit: 130 F to 240 F (54 C to 116 C)
Operating Range, Low Limit: 110 F to 220 F (43 C to 104 C)
Operating Humidity Range (% RH): 0 to 95% RH, non-condensing
Approvals:
Canadian Standards Association: Certified: File No. LR95329-1
Underwriters Laboratories Inc. UL Listed: File No. MP466, Vol. 12, Sec. 4, Guide No. MBPR2