INSTRUCTION SHEET
1
MU1R-9023 0208R12-NE
L4188/L6188A, B, C AND L4191/L6191A, B
AQUASTAT CONTROL
APPLICATION
The L4188/L6188 and L4191/L6191 aquastat thermostats
are sensitive direct immersion type water temperature
thermostats for limiting and controlling boiler water
temperature in hydronic heating systems.
The L4188/L6188 aquastat thermostats are single aquastats.
The L4191/L6191 aquastat thermostats are dual aquastats
i.e. two independent controls (controller and limiter housed
under a single cover).
The L4188/L6188 and L4191/L6191 aquastat thermostats
confirm with the following EC directives:
Low Voltage Directive 73/23/EEC
Electro Magnetic Compatability Directive 89/336/EEC
Compliance with the EMC directive regarding emission can
only be determined in the application.
SPECIFICATIONS
Model
See table 1 page 2
Ambient temperature
0 ... 70
°
C
Capillary length
0.22 m, 1 m, or 1.5 m
Electrical connection
6.3 mm quick connect terminals suitable for
1
/
4
” receptacles.
The L6188 and L6191 series thermostats are provided with
adapters for screw connection
Electrical rating
10 A at 250 Vac, resistive load
2.5 A at 250 Vac, inductive load
15 A at 250 Vac, locked rotor
2 A at 24 Vac, inductive load
250 mA at 30 mVdc (special option)
Terminal data (see fig.1 and 2 )
C-1 breaks on temperature rise (SPST and SPDT)
C-2 makes on temperature rise (SPDT only)
Immersion wells (must be ordered separately for bulk pack
aquastats)
** Insertion length including thread of brass spud
Maximum well pressure: 10 bar for single and multi wells
(ND 10)
Type
Insertion
length (mm)
Thread**
Order number
Single
105
1
/
2
” BSPT
45.900.409-003
169
1
/
2
” BSPT
45.900.409-006
Dual
105
1
/
2
” BSPT
45.900.409-007
