Honeywell L4188 User manual

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

MU1R-9023 0208R12-NE 2

Table 1. L4188/L6188 and L4191/L6191 models

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.

Screw the immersion well into a 1/4” or 1/2” pipe tapping

and tighten (use a good wrench, do not use the device

for this purpose).

Refill the heating system with water and test the

immersion well for water tightness.

Insert the temperature sensor(s) into the well untill it

bottoms and hold in position while securing with the

screw provided.

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

the cable through the conduit box(es).

Wire the thermostat into the circuit.

Mount the conduit box(es) and screw on the front

cover.

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.

Type Temperature range (°C) Switching differential (°C) Switch type Setting means

L4188A 25 ... 95

40 ... 110

4SPST Knob setting

L4188B Internal setting

L6188A 25 ... 95

40 ... 110

70 ... 140

4 ... 10 (adjustable)

SPDT

Knob setting

L6188B 4

4 ... 10 (adjustable)

Internal setting

L6188C 25 ... 95

70 ... 140

Manual reset SPDT Internal setting

L4191A

Controller

Limiter

25 ... 95

SPST

Knob setting

Internal setting

L4191B

Controller

Limiter

25 ... 95

70 ... 140

4 SPST Knob setting

Manual reset SPDT Internal setting

L6191A

Controller

Limiter

25 ... 95

50 ... 95

40 ... 110

4 ... 10 (adjustable) SPDT Knob setting

4 SPDT Internal setting

L6191B

Controller

Limiter

25 ... 95

40 ... 110

70 ... 140

4 ... 10 (adjustable)

SPDT

Knob setting

50 ... 95

40 ... 110

70 ... 140

Manual reset Internal setting

3 MU1R-9023 0208R12-NE

Differential setting

The adjustable differential can be set by turning the disc

located under the front cover.

The disc is turned using a screw driver.

The number in line with the point represents the differential

setting.

Limit resetting

Aquastat thermostats used as limit controls can be provided

with a manual or a tool reset button.

When the limit switch is opened, i.e. cut power off, wait untill

temperature drops below the reset value and

(i) For manual reset models:

Depress the button on the front cover

(ii) For tool reset models:

Remove front cover and depress the button on the

bottom left hand side of front plate.

Final checkout of the installation

Set appliance in operation after any adjustment and observe

a complete cycle to ensure that all burner components

function correctly.

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