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L4188A,B; L4189A,B; L6188A-C;
L6189A-C Aquastat
Remote Bulb with
Screwdriver Slot
Direct Mount with
Setting Knob
APPLICATION
®
Aquastat
Controllers are bulb-type providing operating or
limit control of water temperature in hot water heating systems
and water heaters.
®
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).
• 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.........................................................................
Features ............................................................................
Specifications ....................................................................
Ordering Information .........................................................
Installation .........................................................................
Wiring ................................................................................
Operation...........................................................................
Adjustments.......................................................................
Checkout ...........................................................................
PRODUCT DATA
Contents
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1
2
2
4
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68-0061—1
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Related Manuals for Honeywell AQUASTAT L6188A-C
Summary of Contents for Honeywell AQUASTAT L6188A-C
- Page 1 L4188A,B; L4189A,B; L6188A-C; L6189A-C Aquastat Remote Bulb with Screwdriver Slot Direct Mount with Setting Knob APPLICATION ® Aquastat Controllers are bulb-type providing operating or limit control of water temperature in hot water heating systems and water heaters. ® Controllers FEATURES •...
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Page 2: Specifications
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... - Page 3 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.
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Page 4: Installation
L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS 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. - Page 5 Mounting Behind Panel-Controller with Knob NOTE: The panel can be up to 5/64 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.
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Page 6: Wiring
L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS MOUNTING TEMPLATE 3/16 5/16 3/16 DRILL 2 MOUNTING SCREW HOLES. DRILL HOLE FOR SLOTTED SHAFT. USE SMALL HOLE FOR SHAFT ONLY; LARGE HOLE SHAFT PLUS SETTING SCALE. DRILL SMALL HOLE FOR MODEL WITH MANUAL RESET BUTTON OR LARGE HOLE FOR MODEL WITH DIFFERENTIAL ADJUSTMENT. -
Page 7: Operation
24V THERMOSTAT PROTECTORELAY CONTROL HIGH LIMIT BLACK BURNER MOTOR LOW LIMIT ORANGE CIRCULATOR IGNITION WHITE POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. L4188 OR L4189 USED AS HIGH LIMIT. L6188 OR L6189 USED AS LOW LIMIT/CIRCULATOR CONTROLLER. Fig. -
Page 8: Checkout
Teflon® is a registered trademark for E.I. Du Pont De Nemours and Company. Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 customer.honeywell.com ® U.S. Registered Trademark © 2007 Honeywell International Inc. 68-0061—1 J.I. Rev. 10-07 CONTROLLER DIFFERENTIAL ADJUSTMENT DIAL M25425 Fig.