EN2R-9005 0406R3-NE 6
L4188 - L6188 SINGLE AQUASTAT - DIRECT IMMERSION
APPLICATIONS AND ORDERING INFORMATION
Application
L4188 and L6188 are sensitive, immersion-type water
temperature thermostats for controlling and limiting boiler
water temperature in hydronic heating systems.
The thermostat has a liquid-filled sensing element which fits
into an immersion well (order separately) for direct mounting
into a boiler, tank or other vessel.
Ordering information
1 = High limit stop
2 = High limit stop at 60°C
3 = Capilliary length 1500 mm and mounting bracket
4 = Without cover and conduit box
5 = Quick connect terminals only
6 = With well assembly
7 = With push-in plug
O.S. number Application Temperature
range
Switch
differential (K)
Switch type Setting means Remarks
(see notes)
L4188A 2015 Controller 25 ... 95°C 4 SPST External knob -
L4188A 2023 Controller 40 ... 110°C 4 SPST External knob 5
L4188A 2031 Controller 25 ... 95°C 4 SPST External knob 5
L4188B 2005 Controller 40 ... 110°C 4 SPST Internal screw 4 - 5
L4188B 2013 Controller 25 ... 95°C 4 SPST Internal screw 4 - 5
L6188A 2002 Controller 25 ... 95°C
4 ... 10
(adjustable)
SPDT External knob 6
L6188A 2010 Controller 40 ... 110°C
4 ... 10
(adjustable)
SPDT External knob 6
L6188A 2028 Controller 25 ... 95°C
4 ... 10
(adjustable)
SPDT External knob 3
L6188A 2036 Controller 70 ... 140°C
4 ... 10
(adjustable)
SPDT External knob 6
L6188A 2044 Controller 40 ... 110°C
4 ... 10
(adjustable)
SPDT External knob Tradeline 1 - 7
L6188B 2000 Controller 25 ... 95°C 4 SPDT Internal screw 4
L6188B 2018 Controller 70 ... 140°C
4 ... 10
(adjustable)
SPDT Internal screw 3 - 7
L6188B 2026 Controller 40 ... 110°C
4 ... 10
(adjustable)
SPDT Internal screw
L6188B 2034 Controller 25 ... 95°C
4 ... 10
(adjustable)
SPDT Internal screw 6 - 7
L6188B 2042 Controller 25 ... 95°C 4 SPDT Internal screw
L6188C 2008 Limiter 70 ... 140°C Manual reset SPDT Internal screw 7
L6188C 2016 Limiter 25 ... 95°C Manual reset SPDT Internal screw 6 - 7
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