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Temperature range ( E C)
Type
L4188A
25 ... 95
25
L4188B
40 ... 110
L6188A
25
25 ... 95
L6188B
40 ... 110
70 ... 140
L6188C
25 ... 95
70 ... 140
L4191A
Controller
Controller
25 ... 95
Limiter
L4191B
25 ... 95
25 ... 95
Controller
Controller
70 ... 140
Limiter
L6191A
25 ... 95
Controller
50 ... 95
50 ... 95
40 ... 110
Limiter
L6191B
25 ... 95
Controller
40 ... 110
70 ... 140
Limiter
50 ... 95
40 ... 110
70 ... 140
INSTALLATION
IMPORTANT
Take care that installer is a trained experienced
service man.
The L4188/L6188 and L4191/L6191 aquastats do
not require lubrication.
Mounting
Follow the mounting instructions supplied by the boiler or
burner manufacturer when available.
Where no special instruction is given, follow the procedure as
outlined below:
Drain the water from the heating system.
1
Screw the immersion well into a
2
and tighten (use a good wrench, do not use the device
for this purpose).
Refill the heating system with water and test the
3
immersion well for water tightness.
Insert the temperature sensor(s) into the well untill it
4
bottoms and hold in position while securing with the
screw provided.
MU1R- -9023 9906R11- -NE
Table 1. L4188/L6188 and L4191/L6191 models
95
95
1
1/
/
" or
" pipe tapping
4
2
Switching differential ( E C)
4
4
4 ... 10 (adjustable)
4
4 ... 10 (adjustable)
Manual reset
4
4
Manual reset
4
4 ... 10 (adjustable)
4
4
4 ... 10 (adjustable)
Manual reset
Wiring
CAUTION
Disconnect power supply to prevent electrical shock
and/or equipment damage.
Wiring must be in accordance with local regulations.
The appliance manufacturer's instructions should
always be followed when provided.
Remove the front cover and conduit box(es) and insert
1
the cable through the conduit box(es).
Wire the thermostat into the circuit.
2
Mount the conduit box(es) and screw on the front cover.
3
ADJUSTMENTS
WARNING
Adjustments must be made by qualified persons only.
If the appliance manufacturer supplies checkout and/
or service and maintenance instructions carefully
follow them. If these instructions are not provided then
use the procedure outlined below.
The L4188/L6188 and L4191/L6191 aquastats have
been factory calibrated, field calibration should not be
attempted.
2
Switch type
Setting means
Knob setting
SPST
SPST
Internal setting
Knob setting
Internal setting
SPDT
SPDT
Internal setting
SPST
Knob setting
Internal setting
SPST
Knob setting
SPDT
Internal setting
SPDT
Knob setting
SPDT
Internal setting
Knob setting
SPDT
SPDT
Internal setting
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