Specifications

Aquastat Controllers
70-6910 195
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L4081; L6081 Multiple Aquastat® Controllers
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.
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
Electrical Ratings
Ignition: Transformer Load: 360 VA
Full Load:
5.1A @ 240 Vac; 8A @ 120 Vac
Locked Rotor: 30.6A @ 240 Vac; 48A @ 120 Vac
Millivolt: 0.25 A @ 0.25 to 12 Vdc
Approvals:
Canadian Standards Association: Certified: File No. LR95329-1
Underwriters Laboratories, Inc. UL Listed: File No. MP466, Vol. 12,
Sec. 4, Guide No. MBPR2
Dimensions in inches (millimeters)
Controller
Cover
Product Number Application
Differential
Temperature Insulation Depth
Well Spud
Size
Switching
Action Mounting Includes(F) (inch) (mm) (inch)
L4081A1023 High and Low
limit
High limit: 10 F fixed;
low limit: 10-25 F adj.
1 1/2 in. 38 mm 3/4 in. - 14 NPT SPST: High &
Low Limit
Horizontal —
L4081B1013 High Limit and
Circulator
10 F fixed 3 in. 76 mm 3/4 in. - 14 NPT SPST: High Limit
& Circulator
Horizontal —
L4081B1047 High Limit and
Circulator
High limit: 10 F fixed;
low limit: 10-25 F adj.
1 1/2 in. 38 mm 3/4 in. - 14 NPT SPST: High Limit
& Circulator
Horizontal —
L4081B1096 High Limit and
Circulator
10 F fixed 3 in. 76 mm — SPST: High Limit
& Circulator
Horizontal —
* L6081A1010 High and Low
limit
10 F fixed 3 in. 76 mm 3/4 in. - 14 NPT — Horizontal 3 in. insertion well.
* L6081A1036 High and Low
limit
High limit: 10 F fixed;
low limit: 10-25 F adj.
1 1/2 in.
to 4 in.
38 mm 3/4 in. - 14 NPT — Horizontal —
* TRADELINE models • SUPER TRADELINE models