To set adjustable differential (if provided), To set temperature limit stop (if provided), Checkout – Honeywell L4189A User Manual

Page 8: Caution

Advertising
background image

Automation and Control Solutions
Honeywell International Inc.

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN 55422

Toronto, Ontario M1V 4Z9

customer.honeywell.com

L4188A,B; L4189A,B; L6188A-C; L6189A-C AQUASTAT® CONTROLLERS

® U.S. Registered Trademark
© 2007 Honeywell International Inc.
68-0061—1 J.I. Rev. 10-07

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 degrees of

differential.

Fig. 12. Twist the Screwdriver Slightly to turn the

Differential Dial.

To Set Temperature Limit Stop (if provided)

CAUTION

Follow these instructions carefully to avoid

placing the limit stop pointer on the wrong side of

the setting indicator. In a high limit application,

incorrect 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 counterclockwise

when setting a high limit. Turn it all the way

clockwise

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.

• 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.

Fig. 13. Adjust the Limit Stop with a Screwdriver 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.

Teflon® is a registered trademark for E.I. Du Pont De Nemours and Company.

CONTROLLER

SETTING

INDICATOR

DIFFERENTIAL

ADJUSTMENT

DIAL

M25425

LIFT AND PUSH

TO CHANGE LIMIT

SETTING

AJUST LIMIT STOP

REPLACE KNOB ON SHAFT

LIMIT STOP

POINTER

KNOB

KNOB

SHAFT

SETTING INDICATOR:

LIMIT STOP MUST

BE ON RIGHT SIDE OF

SETTING INDICATOR FOR

HIGH LIMIT; ON LEFT

SIDE FOR LOW LIMIT

FOR LOW LIMIT STOP:

TURN SHAFT

FULL COUNTERCLOCKWISE

(SHOWN) BEFORE

REPLACING KNOB.

FOR HIGH LIMIT STOP:

TURN SHAFT

FULL CLOCKWISE

BEFORE REPLACING

KNOB.

M25426

Advertising
This manual is related to the following products: