Honeywell L4188B, L4189B, L6188A, L6188C, L6189C User Manual

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Honeywell

THESE BULB-TYPE CONTROLLERS PRO­VIDE OPERATING OR LIMIT CONTROL OF
WATER TEMPERATURE IN HOT WATER
HEATING SYSTEMS AND WATER
HEATERS.

Cl L4188 and L4189 provide spst switching

for high or low limit control.
q L6188 and L6189 provide spdt switching

for low limit and circulator control.
Cl L4188, L6188 models are direct-

mounted.

0 L4189, L6189 models are remote bulb.

Cl Diaphragm-operated switch breaks on
temperature rise (spst and normally closed
spdt contacts).

q Compact controller case for application

flexibility.
0 3116 in. diameter bulb for faster

response.
Cl All models available with or without

setting knob. Models without knob are ad-

justed with screwdriver.

Cl Choice of manual or auto reset. Auto
reset models available with fixed or adjust-

able differential.
Cl l/4 in. male quick-connects standard;

combination screw and l/4 in. quick­connects available.

0 Field adjustable high or low limit stop
available.

Cl Bracket for surface mounting available
on remote bulb models.

Cl Capillary on remote bulb models avail­able in several lengths.

Cl Immersion well with l/2 in. NPT spud
available as accessory.

J.A.

2-86.

Form Number 68-0061

Qlioneywell Inc. 1986

SPECIFICATIONS

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 l-AQUASTAT CONTROLLER SELECTION GUIDE

APPLICATION SWITCHING 1 MOUNTING

High or low limit

Low limit and

and circulator

Spst, breaks on

temp. rise.

Spdt, breaks C-l,

makes C-2 on

temp. rise.

Direct

Remote bulb

r

aSpecify when ordering.
ELECTRICAL RATINGS:

24 Vat

Full Load
Locked Rotor

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-l and makes C-2 on

temperature rise to set point; switches back when
temperature drops below set point and through

differential.

1 2.0A

- 1 48.0

1

120 Vat

1 8.0

A 1 5.1
A 1 30.6

IMPORTANT

Screwdriver slot

7,14or22F[4,8or12C],

Giizbkj adjustablea

Knob

Screwdrh

240 Vat

A

A

rer slot

TERMINALS: l/4 in. male quick-connects standard.

Options (specify when ordering):

-Combination screw and l/4 in. quick-connects.

-Separate grounding terminal.

TEMPERATURE SETTING RANGE: 80 to 200 F, 110 to

230 F, and 160 to 280 F [43 to 93 C, 38 to 110 C, and
71 to 138 C] available. Specify when ordering.

Temperature setting minus differential must be no

SETTING SCALE: Marked every 20 degrees F

111 degrees Cl, with subdivisions every 10 degrees F
[6 degrees Cl. Includes OFF setting.

fixeda. or 7-18 F [4-10 C].

7,14,or22F[4,8,or12C],

fixeda, or 7-18 F [4-10 C],

more than 9 F [5 C] below bottom of setting range.

Manual reset L6188C

adiustablea

Manual reset

L4189B

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L6189A

L6189B

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L6189C

continued on page 3

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WHEN PURCHASING THIS HONEYWELL PRODUCT, REFER TO THE PRICE SHEETS FOR COMPLETE
ORDERING NUMBER, OR SPECIFY-

1. Order number.

2. Temperature setting range.

3. Differential.

IF YOU HAVE ADDlTlONAL QUESTIONS, NEED FURTHER INFORMATION, OR WOULD LIKE TO COMMENT ON OUR
PRODUCTS OR SERVICES, PLEASE WRITE OR PHONE:

1. YOUR LOCAL HONEYWELL RESIDENTIAL DIVISION SALES OFFICE (CHECK WHITE PAGES OF PHONE
DIRECTORY).

2. RESIDENTIAL DIVISION CUSTOMER SERVICE
HONEYWELL INC., 1865 DOUGLAS DRIVE NORTH
GOLDEN VALLEY, MINNESOTA 55422-4386 [phone]

IN CANADA-HONEYWELL CONTROLS LIMITED/HONEYWELL LIMITEE, 740 ELLESMERE ROAD, SCARBOROUGH,
ONTARIO MlP 2V9. INTERNATIONAL SALES AND SERVICE OFFICES IN ALL PRINCIPAL CITIES OF THE WORLD.

4. Immersion well or capillary compresslon ffttlng, If needed.

5. Optional specifications, if desired.

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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.

AMBIENT TEMPERATURE RANGE: 32 F to 158 F 10 C

to 70 C].

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 immer-

sion well at desired sensing location. Controller

KNOB MODEL

r*~‘s~‘I

case mounts behind remote panel with two self­tapping M4 or No. 8 sheetmetal screws (supplied).
Optional mounting bracket allows mounting on
front of panel. Specify bracket when ordering.

DIMENSIONS: See Fig. 1.
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.

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0

-

SCREWDRIVER SLOT MODEL

IMMERSION WELLS

a

i-uIMtNSIUNS

IN In.

[mm In brackets 1 OF AQUASTAT CONTROLLER

AND IMMERSION WELL.

68-0061

ACCESSORIES (order separately):

Capillary compression fittings.

Part No. 104484A: l/2 in. NPT spud.
Part No. 1044848: 314 in. NPT spud.

Immersion well. Pressure rating 255 psi [1760 kPa].

Part No. 45900409-0038: l/2 in. BSPT spud,

1 in. insulation, 3-l /2 in. insertion.

Part No. 45900409-0098: l/2 in. NPT spud,

l-l /2 in. insulation, 3 in. insertion.

Part No. 45900409-0108: 3/4 in. NPT spud,

l-1 /2 in. insulation, 3 in. insertion.

OPTIONAL SPECIFICATIONS (specify when ordering):

l Combination screw and l/4 in. male quick-

connect terminals.

0 High or low limit stop (models with knob only).

0 Mounting bracket (remote bulb models only).

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WHEN INSTALLING THIS PRODUCT. . .

1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.

2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.

3. Installer must be a trained, experienced service

technician.

4. After installation is complete, check out product

operation as provided in these instructions.

2. Terminal connections must be inside an en­closure that meets local electrical codes.

INSTALLATION

LOCATION

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 mea-

sured. 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

1. Coat the well threads with a moderate amount of
pipe dope, leaving two end theads bare. Teflon tape
may also be used.

2. Screw the immersion well into the tapping and
tigthen securely.

3. Refill the system. Check for and correct any leaks.

“SE MODERATE AMOUNT
OF PIPE COMPOUND

TO INSTALL DIRECT MOUNT
CONTROLLER

1. Slide the sensing bulb all the way into the well. The
metal collar around the capillary should slip into the
well spud.

2. Line up the case so the setting indicator is on top.

3. Tighten the setscrew in the well spud snugly
against the metal collar.

CONTROLLER

w.03.

FIG. 3-THE DIRECT MOUNT MODEL IS HELD Ih

PLACE BY THE SETSCREW IN THE WELL
SPUD.

TO MOUNT REMOTE BULB

CONTROLLER

INSERT SENSING BULB IN WELL

1. 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.

2. 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

\

12.011

FIG. P-USE GOOD PIPING PRACTICE WHEN IN-

STALLING IMMERSION WELL.

LEAVE 2 EN0 THREADS BARE

CAPIL

FIG. 4-THE SETSCREW KEEPS THE REMOTE SEN-

SING BULB IN THE WELL.

MOUNTING BEHIND PANEL-CONTROLLER
WITH KNOB

NOTE: The panel can be up to 5164 in. thick.

1. Uncoil capillary, starting at bulb. Avoid sharp
bends or kinks in the capillary. Leave excess capillary
loosely coiled below controller case.

2. Remove the setting knob by pulling straight off.

3. Remove the two screws that hold the setting

indicator in place and remove the settino indicator. See
Fig. 5.

4. ADJUSTABLE DIFFERENTIAL MODELS ONLY: Set
differential. See ADJUSTMENT AND CHECKOUT
section.

5. Using setting indicator as a template, mark and
drill holes in the panel for the mounting screws and for

the knob shaft.

6. Mount the controller behind, and the setting in­dicator in front of, the panel using the two screws
removed earlier. See Fig. 5.

7. MODELS WITH TEMPERATURE LIMIT STOP

ONLY: Adjust to desired setting, as described under “To
Set Temperature Limit Stop,” page 8.

8. Replace knob on shaft.

FIG. 5-THE MOUNTING SCREWS HOLD THE SETTING INDICATOR AND CONTROLLER IN PLACE.

MOUNTING BEHIND PANEL-CONTROLLER

WITH SCREWDRIVER SLOT

.

I. MarK

‘*--‘- and drill three holes in the panel, using the

template ir

2. MANUAL RESET MODELS ONLY: Drill a fourth

hole to make the manual reset button accessible.

1 Fig. 6 as a guide.

3. ADJUSTABLE DIFFERENTIAL MODELS ONLY:
Drill a hole for the differential dial, if desired. Set the
differential. See ADJUSTMENT AND CHECKOUT
section.

4. Hold controller against back of panel with ter­minals pointed down and fasten with two No. 8 sheet­metal screws (not supplied). See Fig. 6.

5

68-0061

MOUNTING TEMPLATE

f

DRILL SMALL HOLE FOR MODEL WITH MANUAL RESET BUTTON OR

LARGE HOLE FOR MODEL WITH DlFFERENTlAL AOIVSTMENT.

NO. IO

SHEETMETAL
SCREWS (2)
(OBTAIN LOCALLY,,

FIG. 6-DRILL HOLES IN THE PANEL AS SHOWN.

MOUNTING ON PANEL-CONTROLLER WITH
BRACKET

1. Using controller bracket as a template, mark and

drill two holes in the panel.

FIG. 7-THE CONTROLLER WITH BRACKET MOUNTS

ON THE FRONT OF THE PANEL.

WIRING

All wiring must comply with applicable codes and

ordinances. Disconnect power before beginning wiring.

Connect as shown in equipment manufacturer’s in­structions, if provided. Otherwise, use the typical hook­ups shown below.

24v
THERMOSTAT

2. Mount controller with terminals down.

3. Run capillary neatly along panel, avoiding sharp
bends and interference with other components on the
panel.

4. MODELS WITH TEMPERATURE LIMIT STOP

ONLY: Adjust to desired setting, as described under “To

Set Temperature Limit Stop,” page 8.

1 POWER SVWLY. PROVlOE DISCONNECT MEANS AND OVERLOAD PRO.

n

TECTION AS REQUIRED.

2 “SE ~618B.W (C-l CONTACTS) IF HANVAL RESET IS REQUIRED.

n

IG. 6-LOW AND HIGH LIMIT APPLICATION ON A

GAS-FIRED SYSTEM WITH DOMESTIC HOT
WATER.

6

I,.027

POWER SUPPLY. PROVlOE o,SCONNECT MEANS AND OVERLOAD PRO.

A

TECTION AS REOUIREO.

&; L.lI( OR La,*9 “SE0 AS “10” LIMIT.

13

L6,m OR ~6,119 “SE0 AS Low L,M,T,CIRC”LATOR CONTROLLER.

1

,*.oze

FIG. O-HIGH LIMIT AND LOW LIMITKIRCULATO~

APPLICATION IN AN OIL-FIRED HYDRONIC
SYSTEM WITH DOMESTIC HOT WATER.

OPERATION

-LINE VOLTAGE

- LOW VOLTAGE

PROVlDE CNSCONNECT MEANS AND OVERLOAD PROTECTION AS
REQVIRED.

CONTROL

,,.on

FIG. lo--HIGH LIMIT AND SEPARATE LOW LIMIT

AND CIRCULATOR APPLICATION IN AN

OIL-FIRED HYDRONIC SYSTEM WITH DO­MESTIC HOT WATER.

As the liquid filling 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.

HIGH OR LOW LIMIT ACTION
(L4188, L4189)

The normally closed C-l contacts open on temper-

ature rise to the set point, shutting off power to the

controlled circuit. On auto recycle models, the switch
closes C-l after the temperature falls past the set point

and through the differential. See Fig. 11.

LOW LIMIT/CIRCULATOR ACTION
(L6188, L6189)

The low limit is connected to the normally closed C-l
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-l to turn on the burner. When

the temperature rises to the set point, C-2 makes to turn

on the circulator, and C-l breaks to turn off the burner.

On manual reset models, the reset button must be
pushed before contacts C-l will close. See Fig. 11.

TEMPERATURE

SETTlNG

SCALE

L4188.9
HIGH OR LOW

LS181.9
LOW LIMIT,
ClRCVLATOR

G. ll-AQUASTAT CONTROLLER SWITCH ACTIO’

ON TEMPERATURE CHANGE.

7

66-0061

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.

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.

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
degres of differential.

‘IG. 12-TWIST THE SCREWDRIVER SLIGHTLY TO

TURN THE DIFFERENTIAL DIAL.

TO SET TEMPERATURE LIMIT STOP

(if provided)

ADJUST LIMIT STOP

REPLACE KNOB ON SHAFT

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Follow these tnstructions carefully to avold plac­ing the limit stop pointer on the wrong side of the
setting indicator. In a high limit application, in-

correct 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 counter-

clockwise n when setting a high limit. Turn it all

the way clockwise n 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.

Honoywefl Inc.

1065 Douglas Drive N.

Golden Valley, MN 55422-4386 PRINTED IN U.S.A.

International Sales Dftices in all principal cities of the world. Manufacturing in Australia, Canada, Finland,
France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan. United Kingdom. USA

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FIG. 13-ADJUST THE LIMIT STOP WITH A SCREW-

DRIVER AND CHECK ORIENTATION WHEN
REPLACING KNOB ON SHAFT.

CHECKOUT

Turn the system on and observe it through several

cycles to make sure the controller operates as desired.

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