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L4188A,B; L4189A,B; L6188A-C;
L6189A-C Aquastat® Controllers
PRODUCT DATA
Remote Bulb with
Screwdriver Slot
Direct Mount with
Setting Knob
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).
•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.
APPLICATION
Aquastat® Controllers are bulb-type providing operating or limit control of water temperature in hot water heating systems and water heaters.
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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:
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24 Vac |
120 Vac |
240 Vac |
Full Load |
2.0 A |
8.0 A |
5.1 A |
Locked Rotor |
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48.0 A |
30.6 A |
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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® Controller Selection Guide
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Model |
Application |
Switching |
Mounting |
Setting |
Differentiala |
L4188A |
High or low limit |
Spst, breaks on |
Direct |
Knob |
7°, 14° or 22° F (-14°, -10° or -6° C), |
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temp. rise |
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fixeda |
L4188B |
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Screwdriver slot |
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L4189A |
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Remote bulb |
Knob |
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L4189B |
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Screwdriver slot |
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L6188A |
Low limit and |
Spdt, breaks C-1, |
Direct |
Knob |
7°, 14° or 22° F (-14°, -10° or -6° C), |
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circulator |
makes C-2 on |
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fixeda, 7° - 18° F (-16° - -8° C), |
L6188B |
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Screwdriver slot |
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temp. rise. |
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adjustablea |
L6188C |
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Manual reset |
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L6189A |
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Remote bulb |
Knob |
7°, 14° or 22° F (-14°, -10° or -6° C), |
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fixeda, 7° - 18° F (-16° - -8° C), |
L6189B |
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Screwdriver slot |
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adjustablea |
L6189C |
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Manual reset |
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a Specify when ordering. |
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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 |
Sensing Bulb: Liquid-filled copper (See Fig. 1). |
electrical codes. |
Underwriters Laboratories Inc. Component Recognized: |
Direct: Unit mounts on immersion well at desired sensing |
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location. |
File No. MP466, Guide No. MBPR. |
Remote bulb: Sensing bulb is inserted into immersion well |
Canadian Standards Association Listed: File No. LR62051-1. |
at desired sensing location. Controller case mounts |
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behind remote panel with two self-tapping M4 or No. 8 |
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sheetmetal screws (supplied). Optional mounting bracket |
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allows mounting on front of panel. Specify bracket when |
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ordering. |
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2-11/16 |
KNOB MODEL |
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(68) |
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1-1/4 |
19/32 |
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(32) |
(15) |
11/16 |
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1/2 |
(17) |
7/16 |
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(13) |
3/16 |
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(11) |
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(5) |
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19/32 |
5/8 |
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(15) |
(16) |
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1-7/8 |
1 |
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(48) |
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HOLE FOR |
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4 (101) |
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UP TO NO. 10 |
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SCREW |
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3/8
(9)
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SEE |
1-7/8 |
1-7/8 |
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TABLE |
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(48) |
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(48) |
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SCREWDRIVER SLOT MODEL
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SEE |
4 (101) |
1-1/4 |
TABLE |
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1/2 |
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(32) |
(13) |
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5/8 |
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(16) |
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1-7/8 |
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(48) |
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3/16 |
1-7/8 |
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(5) |
(48) |
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3/8 |
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(9) |
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1-7/8 |
1-7/8 |
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(48) |
(48) |
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IMMERSION WELLS
INSULATION 
INSERTION 
1 OPTIONAL MOUNTING BRACKET
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 |
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DIRECT MOUNT |
1-3/16 IN. |
30 MM |
USE IMMERSION WELLS SHOWN AT RIGHT |
L4188, L5188 |
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2-5/16 IN. |
50 MM |
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REMOTE MOUNT |
39-3/8 IN. |
1000 MM |
USE IMMERSION WELLS SHOWN AT RIGHT |
L4189, L5189 |
50 IN. |
1500 MM |
OR CAPILLARY COMPRESSION FITTINGS |
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78-11/16 IN. |
2000 MM |
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M25414
Fig. 1. Dimensions in in. [mm in brackets] of Aquastat Controller and Immersion Well.
3 |
68-0061—1 |
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