Honeywell Aquastat L4006A Installation Instructions Manual

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Aquastat® Controllers
These boiler-mounted, immersion type controllers
operate in response to temperature changes in hydronic
heating systems.
L4006A breaks the circuit on a temperature rise to the
control setting. It is used for high limit or low limit control.
When used as a controller or as a low limit, a separate
high limit must be used.
L4006B makes the circuit on a temperature rise. It is
used as a circulator controller, delaying circulator
operation when boiler water temperature is below the
control setting.
L4006E,H includes a trip-free manual reset switch.
These models are designed to break the control circuit
whenever the temperature of the controlled medium
reaches the high limit setting. A reset button on the front
of the case must be pressed to re-establish the control
circuit. L4006H also includes bracket and clamp for
surface mounting on pipe or tank.
A plastic bag of heat-conductive compound is included
with the L4006A,B,E Aquastat® Controllers for use when
the sensing bulb is inserted into a well designed for a
large bulb than the one used on the L4006A,B,E. A
124904 Well Adapter, for use on old wells that do not fit
the L4006A,B,E immersion well clamp, can be ordered;
see form 68-0040, Wells and Fittings for Temperature
Controllers. A setting stop is included to prevent setting
above a desired temperature on limit.
If a well adapter or other accessories are needed, refer to
form 68-0040, Wells and Fittings for Temperature
Controllers, for part numbers and ordering information.
When Installing This Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
4. After installation is complete, check out product
operation as provided in these instructions.
Electrical Shock Hazard.
Can cause serious injury, death or equipment
Disconnect the power supply before beginning
installation to prevent electrical shock or
equipment damage.

Installing Immersion Well Models

Obtain the best thermal response with a well
that snugly fits the sensing bulb. The bulb
should be inserted until it rests against the
bottom of the well. Use a well of correct length
and bend the tubing, if necessary, to provide
enough force to hold the bulb against the
bottom of the well. Do not make a sharp bend in
the tubing. A sharp bend can produce a break in
the tubing and cause a loss of fill. This condition
will cause the high and low limit controls to be
made continuously.
If the well is not a snug fit on the bulb, use the
heat-conductive compound as follows. Fold the
plastic bag of compound lengthwise and twist
gently. Snip the end of the bag and insert into
the well. Slowly pull out the bag while squeezing
firmly to distribute the compound evenly in the
well. Insert the bulb into the well. Bend the
tubing, if necessary, to provide force to hold the
bulb against the bottom of the well and to hold
the out end of the bulb in firm contact with the
side of the well. Wipe off any excess compound.
NOTE: Some models have an adjustable capillary
tubing length to 3 inches (76 mm). In these
models, pull out extra tubing from inside the
case, if needed.
Follow the boiler manufacturer instructions, if available;
otherwise, proceed as follows.



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  Summary of Contents for Honeywell Aquastat L4006A

  • Page 1: Immersion Well Models(L4006A,B,E)

    L4006A,B,E,H Aquastat® Controllers INSTALLATION INSTRUCTIONS APPLICATION 3. Installer must be a trained, experienced service technician. 4. After installation is complete, check out product These boiler-mounted, immersion type controllers operation as provided in these instructions. operate in response to temperature changes in hydronic heating systems.
  • Page 2: Immersion Well Clamp

    L4006A,B,E,H AQUASTAT® CONTROLLERS 1. Remove the old control. 2. Refer to the cover insert of the old control to identify and tag each lead as it is disconnected. 3. Leave the old well in place if it is suitable. SETPOINT INDICATING DIAL If Well is Otherwise Suitable But Does Not Fit The L4006 Immersion Well Clamp...
  • Page 3: Mounting Surface Mount Model (L4006H)

    L4006A,B,E,H AQUASTAT® CONTROLLERS 6. Make sure the end of the well fits into the hole in the case. Position the immersion well clamp snugly ENCLOSED over the well flange and tighten the clamp screw SENSING BULB securely. PIPE Mounting Surface Mount Model (L4006H) The L4006H is designed for surface mounting on piping or tank and can be mounted in any position.
  • Page 4: Operation

    L4006A,B,E,H AQUASTAT® CONTROLLERS OPERATION Adjust the control point to correspond with the boiler manufacturer recommendations. To adjust, insert a screwdriver in the slotted screw type head located For proper selections of settings, follow boiler beneath the window in the cover. Turn the scale to the manufacturer recommendations: desired control point.
  • Page 5 Product Use: Heat conductive material used to enhance contact and heat transfer in temperature sensor applications. Section 2. Composition, Information on Ingredients Manufacturer: Honeywell Inc., 1985 Douglas Drive North, Minneapolis, MN 55422. Ingredient CAS Number Percent #2 Lithium Complex Grease (70%):...
  • Page 6 L4006A,B,E,H AQUASTAT® CONTROLLERS Section 7. Handling and Storage Incompatibilities: Strong oxidizing agents and halogens. Store in dry place. Keep container closed when not in use. Hazardous Decomposition Products: Carbon dioxide, carbon monoxide. Section 8. Exposure Controls and Section 11. Toxicology Information. Personal Protection.
  • Page 7 60-0915—5...
  • Page 8 L4006A,B,E,H AQUASTAT® CONTROLLERS Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 ® U.S. Registered Trademark © 2005 Honeywell International Inc. 60-0915—5 C.H. Rev. 08-05...

This manual is also suitable for:

Aquastat l4006eAquastat l4006hAquastat l4006b