Honeywell L6189A-C, L4189A, L4188A, L6188A-C User Manual
L4188A,B; L4189A,B; L6188A-C;
L6189A-C Aquastat® Controllers
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
Direct Mount with
Setting Knob
• 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.
• Capillary on remote bulb models available in several
lengths.
• Immersion well with 1/2 in. NPT spud available as
accessory.
PRODUCT DATA
APPLICATION
Aquastat® Controllers are bulb-type providing operating or
limit control of water temperature in hot water heating systems
and water heaters.
Contents
Application......................................................................... 1
Features ............................................................................ 1
Specifications .................................................................... 2
Ordering Information ......................................................... 2
Installation ......................................................................... 4
Wiring ................................................................................ 6
Operation........................................................................... 7
Adjustments....................................................................... 7
Checkout ........................................................................... 8
68-0061—1
L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS
SPECIFICATIONS
Electrical Ratings:
24 Vac 120 Vac 240 Vac
Full Load 2.0 A 8.0 A 5.1 A
Locked Rotor 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.
Terminals: 1/4 in. male quick-connects standards. Options
(specify when ordering):
Combination screw and 1/4 in. quick connects.
Separate grounding terminal.
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
Model Application Switching Mounting Setting Differential
L4188A High or low limit Spst, breaks on
L4188B Screwdriver slot
temp. rise
®
Controller Selection Guide
a
Direct Knob 7°, 14° or 22° F (-14°, -10° or -6° C),
a
fixed
L4189A Remote bulb Knob
L4189B Screwdriver slot
L6188A Low limit and
L6188B Screwdriver slot
circulator
Spdt, breaks C-1,
makes C-2 on
temp. rise.
Direct Knob 7°, 14° or 22° F (-14°, -10° or -6° C),
a
fixed
, 7° - 18° F (-16° - -8° C),
adjustable
a
L6188C Manual reset
L6189A Remote bulb Knob 7°, 14° or 22° F (-14°, -10° or -6° C),
a
fixed
L6189B Screwdriver slot
, 7° - 18° F (-16° - -8° C),
adjustable
a
L6189C Manual reset
a
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).
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.
KNOB MODEL
2-11/16
(68)
1-1/4
(32)
7/16
(11)
1-7/8
(48)
3/8
(9)
19/32
(15)
1
1-7/8
(48)
5/8
(16)
HOLE FOR
UP TO NO. 10
SCREW
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:
19/32
(15)
1-7/8
(48)
1/2
(13)
11/ 16
(17)
SEE
TAB LE
4 (101)
File No. LR62051-1.
3/16
(5)
SCREWDRIVER SLOT MODEL
5/8
(16)
1-7/8
(48)
3/8
(9)
1-1/4
(32)
1-7/8
(48)
1-7/8
(48)
1/2
(13)
IMMERSION WELLS
INSULATION
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 CAPILLARY LENGTH MOUNTING
DIRECT MOUNT
L4188, L5188
REMOTE MOUNT
L4189, L5189
INSERTION
30 MM USE IMMERSION WELLS SHOWN AT RIGHT1-3/16 IN.
50 MM2-5/16 IN.
1000 MM39-3/8 IN.
1500 MM50 IN.
2000 MM78-11/16 IN.
USE IMMERSION WELLS SHOWN AT RIGHT
OR CAPILLARY COMPRESSION FITTINGS
1-7/8
(48)
SEE
TAB LE
OPTIONAL MOUNTING BRACKET
1
4 (101)
3/16
(5)
M25414
Fig. 1. Dimensions in in. [mm in brackets] of Aquastat Controller and Immersion Well.
3 68-0061—1
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