Honeywell L4188A User's Manual

Honeywell Water Heater User's Manual - L4188A.
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PRODUCT DATA

68-0061—1

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

APPLICATION

Aquastat® Controllers are bulb-type providing operating or 

limit control of water temperature in hot water heating systems 

and water heaters.

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.

Direct Mount with

Setting Knob

Contents

Application.........................................................................

1

Features ............................................................................

1

Specifications ....................................................................

2

Ordering Information .........................................................

2

Installation .........................................................................

4

Wiring ................................................................................

6

Operation...........................................................................

7

Adjustments.......................................................................

7

Checkout ...........................................................................

8

Remote Bulb with

Screwdriver Slot

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