Honeywell Aquastat L6188A C Users Manual 68 0061 1 L4188A,B; L4189A,B; C; L6189A Aquastat® Controllers

L4189A 68-0061

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L4188A,B; L4189A,B; L6188A-C;
L6189A-C Aquastat® Controllers
PRODUCT DATA

FEATURES
• L4188 and L4189 provide spst switching for high and
low limit control.
• L6188 and L6189 provide spst switching for low limit
and circulator control.
• L4188, L6188 models are direct-mounted.
• L4189, L6189 models are remote bulb.
• Diaphragm-operated switch breaks on temperature
rise (spst and normally closed spdt contacts).
Remote Bulb with
Screwdriver Slot

• Compact controller case for application flexibility.
• 3/16 in. diameter bulb for faster response.
• All models available with or without setting knob.
Models without knob are adjusted with screwdriver.
• Choice of manual or auto reset. Auto reset models
available with fixed or adjustable differential.
• 1/4 in. male quick-connects standard; combination
screw and 1/4 in. quick-connects available.
• Field adjustable high or low limit stop available.
• Bracket for surface mounting available on remote bulb
models.

Direct Mount with
Setting Knob

• Capillary on remote bulb models available in several
lengths.
• Immersion well with 1/2 in. NPT spud available as
accessory.

APPLICATION
Aquastat® Controllers are bulb-type providing operating or
limit control of water temperature in hot water heating systems
and water heaters.

Contents
Application.........................................................................
Features ............................................................................
Specifications ....................................................................
Ordering Information .........................................................
Installation .........................................................................
Wiring ................................................................................
Operation...........................................................................
Adjustments.......................................................................
Checkout ...........................................................................

1
1
2
2
4
6
7
7
8

68-0061—1

L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS

SPECIFICATIONS
Electrical Ratings:
24 Vac
Full Load

2.0 A

Locked Rotor

120 Vac

Terminals: 1/4 in. male quick-connects standards. Options
(specify when ordering):
Combination screw and 1/4 in. quick connects.
Separate grounding terminal.

240 Vac

8.0 A

5.1 A

48.0 A

30.6 A

Switching: Diaphragm-operated, snap-acting switch.
L4188, L4189: Switch breaks on temperature rise to set
point, remakes when temperature drops below set point
and through differential.
L6188, L6189: Switch breaks C-1 and makes C-2 on
temperature rise to set point; switches back when
temperature drops below set point and through
differential.

Temperature Setting Range: 80° to 200° F (27° to 93° C),
110° to 230° F (43° to 110° C), and 160° to 280° F (71° to
138° C) available. Specify when ordering.
Temperature setting minus differential must be no more
than 9° F (-13° C) below bottom of setting range.
Setting Scale: Marked every 20° F (-7° C), with subdivisions
every 10° F (-12° C), includes OFF setting.
Limit Stop: Limits dial rotation beyond desired high or low
limit temperature. Can be set at 5° F (2.5° C) intervals.
Optional, available on models with knob only. Specify when
ordering.

IMPORTANT
The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not
match the listed specifications exactly. Also, this product is tested and calibrated under closely controlled conditions,
and some minor differences in performance can be expected if those conditions are changed.
MODELS: See Table 1.
Table 1. Aquastat® Controller Selection Guide
Model
L4188A

Application
High or low limit

L4188B

Switching
Spst, breaks on
temp. rise

L4189A

Mounting
Direct

Knob
Screwdriver slot

Remote bulb

L4189B
L6188A
L6188B

Setting

7°, 14° or 22° F (-14°, -10° or -6° C),
fixeda

Knob
Screwdriver slot

Low limit and
circulator

Spdt, breaks C-1, Direct
makes C-2 on
temp. rise.

Knob
Screwdriver slot

L6188C
L6189A

7°, 14° or 22° F (-14°, -10° or -6° C),
fixeda, 7° - 18° F (-16° - -8° C),
adjustablea
Manual reset

Remote bulb

L6189B

Knob
Screwdriver slot

L6189C
a

Differentiala

7°, 14° or 22° F (-14°, -10° or -6° C),
fixeda, 7° - 18° F (-16° - -8° C),
adjustablea
Manual reset

Specify when ordering.

ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).
2. Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
68-0061—1

2

L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS

Ambient Temperature Range: 32° to 158° F (0° to 70° C).

Dimensions: See Fig. 1.

Mounting: Must be mounted in an enclosure that meets local
electrical codes.
Direct: Unit mounts on immersion well at desired sensing
location.
Remote bulb: Sensing bulb is inserted into immersion well
at desired sensing location. Controller case mounts
behind remote panel with two self-tapping M4 or No. 8
sheetmetal screws (supplied). Optional mounting bracket
allows mounting on front of panel. Specify bracket when
ordering.

Sensing Bulb: Liquid-filled copper (See Fig. 1).
Underwriters Laboratories Inc. Component Recognized:
File No. MP466, Guide No. MBPR.
Canadian Standards Association Listed: File No. LR62051-1.

KNOB MODEL

2-11/16
(68)

19/32
(15)

1-1/4
(32)
7/16
(11)
19/32
(15)
1-7/8
(48)

11/16
(17)

1/2
(13)

3/16
(5)

5/8
(16)
1
HOLE FOR
UP TO NO. 10
SCREW

4 (101)

3/8
(9)
1-7/8
(48)

SEE
TABLE

1-7/8
(48)

SCREWDRIVER SLOT MODEL
1-1/4
(32)

1/2
(13)

SEE
TABLE

4 (101)

5/8
(16)
1-7/8
(48)

3/16
(5)

1-7/8
(48)
3/8
(9)
1-7/8
(48)

1-7/8
(48)

IMMERSION WELLS
INSULATION
INSERTION

1

PART NO.

SPUD

INSULATION

INSERTION

45900409-003B

1/2 in. BSPT

1 in.

3-1/2 in.

45900409-009B

1/2 in. NPT

1-1/2 in.

3 in.

45900409-010B

3/4 in. NPT

1-1/2 in.

3 in.

MODEL
DIRECT MOUNT
L4188, L5188
REMOTE MOUNT
L4189, L5189

CAPILLARY LENGTH
1-3/16 IN.

OPTIONAL MOUNTING BRACKET

MOUNTING

30 MM

USE IMMERSION WELLS SHOWN AT RIGHT

2-5/16 IN.

50 MM

39-3/8 IN.

1000 MM

50 IN.

1500 MM

78-11/16 IN.

2000 MM

USE IMMERSION WELLS SHOWN AT RIGHT
OR CAPILLARY COMPRESSION FITTINGS
M25414

Fig. 1. Dimensions in in. [mm in brackets] of Aquastat Controller and Immersion Well.
3

68-0061—1

L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS

3.

Accessories (order separately):
Capillary compression fittings.
Part No. 104484A: 1/2 in. NPT spud.
Part No. 104484B: 3/4 in. NPT spud.
Immersion well: Pressure rating 255 psi [1760 kPa].
Part No. 45900409-003B: 1/2 in. BSPT spud, 1 in.
insulation, 3-1/2 in. insertion.
Part No. 45900409-009B: 1/2 in. NPT spud, 1-1/2 in.
insulation, 3 in. insertion.
Part No. 45900409-010B: 3/4 in. NPT spud, 1-1/2 in.
insulation, 3 in. insertion.

Refill the system. Check for and correct any leaks.
USE MODERATE AMOUNT
OF PIPE COMPOUND

LEAVE 2 END THREADS BARE
M25415

Fig. 2. Use good Piping Practice when Installing
Immersion Well.

Optional Specifications (Specify when ordering):
• Combination screw and 1/4 in. male quick-connect
terminals.
• High or low limit stop (models with knob only).
• Mounting bracket (remote bulb models only).

To Install Direct Mount Controller
1.
2.
3.

INSTALLATION

Slide the sensing bulb all the way into the well. The metal
collar around the capillary should slip into the well spud.
Line up the case so the setting indicator is on top.
Tighten the setscrew in the well spud snugly against the
metal collar.
CONTROLLER

When Installing This Product...
1.
2.
3.
4.

SPUD

Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
Installer must be a trained, experienced service
technician.
After installation is complete, check out product
operation as provided in these instructions.

CAUTION

Disconnect power supply before wiring to avoid
electrical shock or equipment damage.
Terminal connections must be inside an enclosure
that meets local electrical codes.

WELL

BULB
METAL
COLLAR

The equipment manufacturer generally provides a tapping for
insertion of the temperature controller sensing element. The
tapping should be located at a point where average system
temperature will be measured. Never locate the sensing
element close to a hot or cold water inlet or a steam coil, or
where the well’s pressure rating will be exceeded.
Turn off power and, if the system is filled, drain to a point below
the boiler tapping or wherever the sensing element is to be
located. If no tapping is provided, prepare one, properly
threaded, at the desired location.
If this is a remote bulb unit, the controller case can be mounted
in a panel or, with the optional bracket, on any flat surface.
Choose a location within reach of the sensing element. Allow
for gradual bends and some slack in the capillary.

Mount the Immersion Well
2.

Fig. 3. The Direct Mount Model is held in place by the
Setscrew in the Well Spud.

To Mount Remote Bulb Controller
Insert Sensing Bulb in Well
1.
2.

Slide sensing bulb into well. Make sure bulb rests
against the bottom of the well. Don’t bend the capillary
where it connects to the bulb.
Hold bulb in place and tighten setscrew all the way
down. It won’t fit tight against the capillary, but it will keep
the bulb from sliding out.
SETSCREW
SPUD
CAPILLARY

SETSCREW
CAPILLARY

SPUD
BULB

WELL

M25417

Fig. 4. The Setscrew keeps the Remote Sensing Bulb in
the Well.

Coat the well threads with a moderate amount of pipe
dope, leaving two end threads bare. Teflon® tape may
also be used.
Screw the immersion well into the tapping and tighten
securely.

68-0061—1

CAPILLARY

M25416

Location

1.

SETSCREW

4

L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS

Mounting Behind Panel-Controller with Knob

5.

NOTE: The panel can be up to 5/64 in. thick.
1.
2.
3.

4.

Uncoil capillary, starting at bulb. Avoid sharp bends or
kinks in the capillary. Leave excess capillary loosely
coiled below controller case.
Remove the setting knob by pulling straight off.
Remove the two screws that hold the setting indicator in
place and remove the setting indicator (See Fig. 5).

6.
7.
8.

ADJUSTABLE DIFFERENTIAL MODELS ONLY: Set
differential. See Adjustment and Checkout section.
Using setting indicator as a template, mark and drill
holes in the panel for the mounting screws and for the
knob shaft.
Mount the controller behind, and the setting indicator in
front of, the panel using the two screws removed earlier
(See Fig. 5).
MODELS WITH TEMPERATURE LIMIT STOP ONLY:
Adjust to desired setting, as described under “To Set
Temperature Limit Stop,” page 8.
Replace knob on shaft.

SETTING
INDICATOR

CONTROLLER

PANEL
(MAX. 5/64 IN. THICK)

NO. 8
MOUNTING
SCREWS (2)

KNOB
M25418

Fig. 5. The Mounting Screws hold the Setting Indicator and Controller in place.

Mounting Behind Panel-Controller with Screwdriver Slot
1.
2.

Mark and drill three holes in the panel, using the template in Fig. 6 as a guide.
MANUAL RESET MODELS ONLY: Drill a fourth hole to
make the manual reset button accessible.

5

3.
4.

ADJUSTABLE DIFFERENTIAL MODELS ONLY: Drill a
hole for the differential dial, if desired, Set the differential.
See Adjustment and Checkout section.
Hold controller against back of panel with terminals
pointed down and fasten with two No. 8 sheetmetal
screws (not supplied) (Refer to Fig. 6).

68-0061—1

L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS

MOUNTING TEMPLATE

NO. 10
SHEETMETAL
SCREWS (2)
(OBTAIN LOCALLY)

3/4
1

5/16

3/16

3/16
1

PANEL
2

MOUNTING
BRACKET

5/8
3/16

3

1

DRILL 2 MOUNTING SCREW HOLES.

2

DRILL HOLE FOR SLOTTED SHAFT. USE SMALL HOLE FOR SHAFT
ONLY; LARGE HOLE SHAFT PLUS SETTING SCALE.

3

DRILL SMALL HOLE FOR MODEL WITH MANUAL RESET BUTTON OR
LARGE HOLE FOR MODEL WITH DIFFERENTIAL ADJUSTMENT.

CONTROLLER
CAPILLARY

CONTROLLER
M25420

SLOTTED
SHAFT

Fig. 7. The Controller with Bracket Mounts on the Front of
the Panel.

WIRING
MANUAL
RESET
BUTTON
PANEL

All wiring must comply with applicable codes and ordinances,
Disconnect power before beginning wiring.

NO. 8
MOUNTING SCREWS (2)
(OBTAIN LOCALLY)

Connect as shown in equipment manufacturer’s instructions, if
provided. Otherwise, use the typical hookups shown
(See Fig. 8) (refer to Figures 9 and 10).

M25419

Fig. 6. Drill holes in the Panel as shown.

24V
THERMOSTAT

Mounting on Panel-Controller with Bracket
1.
2.
3.
4.

Using controller bracket as a template, mark and drill two
holes in the panel.
Mount controller with terminals down.
Run capillary neatly along panel, avoiding sharp bends
and interference with other components on the panel.
MODELS WITH TEMPERATURE LIMIT STOP ONLY:
Adjust to desired setting, as described under “To Set
Temperature Limit Stop,” page 8.

LOW WATER
CUTOFF

L4188.9
LOW LIMIT
2

PRESSURE
CONTROLLER

L4188.9
HIGH LIMIT
L1
(HOT)
L2
1

TH-TR
TH

TR

24V
GAS VALVE

1

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

2

USE L6188.9C (C-1 CONTACTS) IF MANUAL RESET IS REQUIRED.
M25421

Fig. 8. Low and High Limit Application on a Gas-Fired
System with Domestic Hot Water.

68-0061—1

6

L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS

OPERATION
24V THERMOSTAT

As the liquid filing the sensing bulb and capillary expands and
contracts, it moves a diaphragm. Movement of the diaphragm
is transferred by a lever to the snap-acting switch in the
controller.

RELAY CENTER
R
PROTECTORELAY
CONTROL
HIGH LIMIT

L1
(HOT)

G

High or Low Limit Action (L4188, L4189)

L2

The normally closed C-1 contacts open on temperature rise to
the set point, shutting off power to the controlled circuit. On
auto recycle models, the switch closes C-1 after the
temperature falls past the set point and through the differential
(See Fig. 11).

2

BLACK
BURNER MOTOR

3
LOW LIMIT
C
1

ORANGE

2

Low Limit/Circulator Action (L6188, L6189)

CIRCULATOR
MOTOR

The low limit is connected to the normally closed C-1 contacts,
and the circulator to the normally open C-2 contacts. As long
as the temperature at the sensing bulb is above set point, the
circulator runs. If sensing bulb temperature falls past the set
point and through the differential, the switch breaks C-2 to turn
off the circulator, and makes C-1 to turn on the burner. When
the temperature rises to the set point, C-2 makes to turn on the
circulator, and C-1 breaks to turn off the burner.

CIRCULATOR

IGNITION

WHITE
T
T

1

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

2

L4188 OR L4189 USED AS HIGH LIMIT.

3

L6188 OR L6189 USED AS LOW LIMIT/CIRCULATOR CONTROLLER.

On manual reset models, the reset button must be pushed
before contacts C-1 will close (See Fig. 11).
TEMPERATURE
SETTING
SCALE
L4188.9
HIGH OR LOW
220 F
LIMIT

M25422

Fig. 9. High Limit and Low Limit/Circulator Application in
an Oil-Fired Hydronic System with domestic hot water.
24V
THERMOSTAT

1

SWITCHING RELAY
RA832A
T

SET POINT

T

L1 L2
(HOT)

DIFFERENTIAL
L4188.9
HIGH LIMIT

2

BLACK
1
X

X

IGNITION

4

WHITE

SET POINT

L6188.9
LOW LIMIT/
CIRCULATOR
2

MANUAL
C 1
RESET
BREAKS
C-1 BREAKS MAKES C-1
C-2 MAKES
2
1
AUTO
RECYCLE
C
2
SET POINT
C 1
LESS
C 1
DIFFERMAKES ENTIAL
C-1 MAKES
C-2 BREAKS
C 1

ORANGE

L4188.9
CIRCULATOR

100 F
M25424

L4188.9
LOW LIMIT

CIRCULATOR

BURNER

T

Fig. 11. Aquastat Controller Switch Action on Temperature
Change.

T
LINE VOLTAGE
LOW VOLTAGE
1

PROTECTORELAY
CONTROL

ADJUSTMENTS

PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS
REQUIRED.
M25423

Fig. 10. High Limit and Separate Low Limit and Circulator
Application in an Oil-Fired Hydronic System with
Domestic Hot Water.

To Set Temperature
KNOB MODELS
Line up the desired temperature setting with the temperature
setting indicator behind the knob.
SCREWDRIVER SLOT MODELS
Line up the pointer on the shaft with the desired temperature
setting printed on the case.

7

68-0061—1

L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS

To Set Adjustable Differential (if provided)
Use a screwdriver to turn the differential dial until the slot
molded into the case lines up with the desired degrees of
differential.

AJUST LIMIT STOP

LIFT AND PUSH
TO CHANGE LIMIT
SETTING

CONTROLLER

LIMIT STOP
POINTER

KNOB
DIFFERENTIAL
ADJUSTMENT
DIAL

REPLACE KNOB ON SHAFT
SETTING
INDICATOR
M25425

SETTING INDICATOR:
LIMIT STOP MUST
BE ON RIGHT SIDE OF
SETTING INDICATOR FOR
HIGH LIMIT; ON LEFT
SIDE FOR LOW LIMIT

Fig. 12. Twist the Screwdriver Slightly to turn the
Differential Dial.

To Set Temperature Limit Stop (if provided)

CAUTION

SHAFT
FOR LOW LIMIT STOP:
TURN SHAFT
FULL COUNTERCLOCKWISE
(SHOWN) BEFORE
REPLACING KNOB.
FOR HIGH LIMIT STOP:
TURN SHAFT
FULL CLOCKWISE
BEFORE REPLACING
KNOB.

Follow these instructions carefully to avoid
placing the limit stop pointer on the wrong side of
the setting indicator. In a high limit application,
incorrect positioning of the pointer will cause
system operation above the limit stop setting,
potentially resulting in overheating or related
conditions.

• Remove the knob.
• Turn the controller shaft all the way counterclockwise
when setting a high limit. Turn it all the way
clockwise
when setting a low limit.
• Find the metal limit stop on the back of the knob.
• Lift the limit stop slightly with a pencil or screwdriver and
push to move to desired setting.
• Read the setting from the front of the knob.
• Place the knob on the shaft.
• Turn the knob to make sure it: (1) turns through the desired
adjustment range, and (2) stops at the limit setting.
DO NOT FORCE.
• Return knob to desired setting.

CHECKOUT
Turn the system on and observe it through several cycles to
make sure the controller operates as desired.

Automation and Control Solutions
Honeywell International Inc.

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN 55422

Toronto, Ontario M1V 4Z9

® U.S. Registered Trademark
© 2007 Honeywell International Inc.
68-0061—1 J.I. Rev. 10-07

M25426

Fig. 13. Adjust the Limit Stop with a Screwdriver and
check Orientation when Replacing Knob on Shaft.

Teflon® is a registered trademark for E.I. Du Pont De Nemours and Company.

customer.honeywell.com

KNOB



---

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Title                           : 68-0061-1 - L4188A,B; L4189A,B; L6188A-C; L6189A-C Aquastat® Controllers
Creator                         : Honeywell Technical Communications
Description                     : Product Data
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Subject                         : Product Data
Author                          : Honeywell Technical Communications

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