EN2R-9005 0406R3-NE 12
L4191 - L6191 DUAL AQUASTAT - DIRECT IMMERSION
APPLICATION AND ORDERING INFORMATION
Application
L4191 and L6191 are dual units in which two independently
working water temperature thermostats are housed in one
cover. Each thermostat has a separate liquid filled sensing
element which fits into a common immersion well for direct
mounting into a boiler, tank or other vessel. One thermostat,
with external temperature setting dial, acts as a controller
while the other, with internal setting dial, acts as a high limit
control.
Two main types are available, one with controller and auto
recycling high limit and the other with controller and high limit
with manual reset.
Ordering information L4191
1 =Gold contacts for thermocouple applications, without jumper
2 =High limit stop at 80°C/low limit stop at 60°C
3 =High limit stop at 82°C
4 =Low limit stop at 95°C
5 =Isolated neutral terminal
6 =High limit stop at 95°C
7 =With well assembly
8 =High limit stop
9 =With jumper
10 =With push-in plug
11 =Without knob and index
Ordering information L6191
1 =Gold contacts for thermocouple applications, without jumper
2 =High limit stop at 80°C/low limit stop at 60°C
3 =High limit stop at 82°C
4 = Low limit stop at 95°C
5 = Isolated neutral terminal
6 = High limit stop at 95°C
7 = With well assembly
8 = High limit stop
9 = With jumper
10 =With push-in plug
11 = Without knob and index
O.S. number Application Temperature
range
Switch
differential (K)
Switch type Setting means Remarks
(see notes)
L4191A 2002
Controller 25 ... 95°C 4 SPST External knob 9
Limiter 25 ... 95°C 4 SPST Internal screw 9
L4191A 2010
Controller 25 ... 95°C 4 SPST External knob 7 - 9 - 10
Limiter 25 ... 95°C 4 SPST Internal screw 9
L4191B 2018
Controller 70 ... 140°C 4 SPST External knob 6
Limiter 70 ... 140°C Manual reset SPDT Internal screw 1
L4191B 2042
Controller 25 ... 95°C 4 SPST External knob 5 - 9 - 10
Limiter 25 ... 95°C Manual reset SPDT Internal screw 9 - 10
O.S. number Application Temperature
range
Switch
differential (K)
Switch type Setting means Remarks
(see notes)
L6191A 2007
Controller 40 ... 110°C
4 ... 10
(adjustable)
SPDT External knob 6 - 7 - 9
Limiter 40 ... 110°C 4 SPDT Internal screw 9
L6191A 2015
Controller 25 ... 95°C 4 SPDT External knob 3
Limiter 101°C fixed 4 SPST Internal setting 1
L6191A 2023
Controller 50 ... 95°C 4 SPDT External knob 3
Limiter 101°C fixed 4 SPST Internal screw 1
L6191B 2005
Controller 25 ... 95°C 4 SPDT External knob 7 - 9 - 10
Limiter 40 ... 110°C Manual reset SPDT Internal screw 9
L6191B 2013
Controller 40 ... 110°C 4 SPDT External knob 5 - 6 - 7 - 9
Limiter 40 ... 110°C Manual reset SPDT Internal screw 9
L6191B 2021
Controller 70 ... 140°C
4 ... 10
(adjustable)
SPDT External knob 4 - 7 - 9
Limiter 70 ... 140°C Manual reset SPDT Internal screw 9
L6191B 2047
Controller 70 ... 140°C
4 ... 10
(adjustable)
SPDT External knob 4 - 7 - 9 - 11
Limiter 70 ... 140°C Manual reset SPDT Internal screw 9
L6191B 2054
Controller 25 ... 95°C 4 SPDT External knob 7 - 10
Limiter 50 ... 95°C Manual reset SPDT Internal screw
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