Honeywell Thermostat L4006B Users Manual 60 0915 L4006A,B,E,H Aquastat Controllers

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L4006A,B,E,H
Aquastat® Controllers
INSTALLATION INSTRUCTIONS

APPLICATION
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.

INSTALLATION
When Installing This Product…
1.
2.

Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.

® U.S. Registered Trademark
Copyright © 2001 Honeywell • All Rights Reserved

3.
4.

Installer must be a trained, experienced service
technician.
After installation is complete, check out product
operation as provided in these instructions.

WARNING

Electrical Shock Hazard.
Can cause serious injury, death or equipment
damage.
Disconnect the power supply before beginning
installation to prevent electrical shock or
equipment damage.

Installing Immersion Well Models
(L4006A,B,E)
IMPORTANT
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.

60- 0915- 4

L4006A,B,E,H AQUASTAT® CONTROLLERS
1.
2.

Remove the old control.
Refer to the cover insert of the old control to
identify and tag each lead as it is disconnected.
Leave the old well in place if it is suitable.

3.

SETPOINT
INDICATING DIAL

If Well is Otherwise Suitable But Does Not Fit
The L4006 Immersion Well Clamp
Use a 124904 Well Adapter (order separately, see form
68-0040) to secure the L4006 to the old well. The
adapter has a flange at one end for fastening the L4066
adapter clamp.
1.

DIFFERENTIAL
ADJUSTMENT 1
WHEEL
ADAPTER CLAMP
SCREWS

Loosen, but do not remove, the two adapter clamp
screws (see Fig. 1).
Slide the adapter onto the capillary and short tube;
see Fig. 2 inset.
Make sure the flanged end of the adapter fits into
the hole in the case. Position the adapter well
clamp snugly over the flange on the adapter, then
tighten the clamp screws.
Insert the bulb into the well, as shown in Fig. 2. If
necessary, use the heat-conductive compound as
instructed in the IMPORTANT statement on page
1.
Tighten the setscrew (if one is present in the old
well spud) against the adapter.

2.
3.

4.

5.

2

IMMERSION
WELL

1

MODELS WITH FIXED DIFFERENBTIALS DO NOT INCLUDE
ADJUSTING WHEEL.

2

VERTICALLY MOUNTED IMMERSION WELL IS ATTACHED
TO THE BOTTOM OF THE CASE.
M4679

Fig. 1. Internal view of L4006A,B with horizontal well.
L4006E is the same with reset button added.

ADAPTER
CLAMP

BACK OF
CASE

ADAPTER
CONTROLLER
CASE

BOILER
IMMERSION
WELL SPUD

ADAPTER 1
CLAMP
ADAPTER

OLD IMMERSION
WELL ASSEMBLY

SENSING
BULB

(A)
(D)

(C)

(B)

2

HEAT-CONDUCTIVE COMPOUND
CAPILLARY
TUBE
SETSCREW
SHORT TUBE
FITS IN CENTRAL
RECESS OF
ADAPTER

1

SLIGHTLY BEND IN TUBES SHOULD HOLD BULB IN GOOD THERMAL CONTACT WITH THE WELL AT TWO OPPOSITE POINTS, AS IN (A) AND (B).

2

ASSURE THAT TUBES FIT FREELY IN ADAPTER SO THAT TENSION OF THE CAPILLARY TUBE AT POINT (C)
HOLDS THE SENSING BULB IN GOOD THERMAL CONTACT WITH THE BOTTOM OF WELL AT POINT (D).

M4678

Fig. 2. Bulb in immersion well and use of adapter.

If the Old Well Is Unsuitable.
1.
2.
3.

4.

Drain the system and remove the well.
Select a new well from form 68-0040 (order well
separately).
Install the new well, refill the system and check for
leaks.

60-0915—4

5.

2

Loosen, but do not remove, the two adapter clamp
screws (Fig. 1).
Insert the sensing bulb into the well until it bottoms
as show in Fig. 2. Add heat-conductive compound,
if necessary, as instructed in the IMPORTANT
statement on page 1.

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
over the well flange and tighten the clamp screw
securely.

ENCLOSED
SENSING BULB

PIPE

Mounting Surface Mount Model (L4006H)
The L4006H is designed for surface mounting on piping
or tanks and can be mounted in any position.
When mounting the L4006H on piping, the pipe should
be 1 in. (25 mm) diameter or larger for accurate
temperature sensing.

ADJUSTABLE
PIPE STRAP

1.
2.
3.

Remove any insulation from the pipe.
Thoroughly scrape off all scale, rust or paint.
Mount controller as shown in Fig. 3 using
adjustable pipe strap furnished.
When mounting the L4006H on a tank, use a pipe strap
(not provided) of appropriate length for the tank. Fit the
pipe strap through the slot in the mounting bracket. See
Fig. 3.

Wiring
AQUASTAT¤
CONTROLLER
CASE

WARNING

M8771

Electrical Shock Hazard.
Can cause serious injury, death or equipment
damage.
Disconnect power supply before connecting
wiring to avoid electrical shock or equipment
damage.

Fig. 3. Mount L4006H directly on surface.

24 VOLT
THERMOSTAT

1

RA832A
SWITCHING RELAY

All wiring must comply with local codes and ordinances
regarding wire size, insulation, enclosure, etc. See Fig. 4
and 5 for typical diagrams of Aquastat® Controllers used
in heating systems.

T

T

L1
L2
(HOT)

L4006A OR L4007A
HIGH LIMIT
AQUASTAT¤
CONTROLLER
1

2

2
1

IGNITION

Use these Aquastat Controllers with copper wire only.

4
X

4

X

CIRCULATOR
L4006B OR L4007B
CIRCULATOR
AQUASTAT¤
CONTROLLER

3

BURNER
T

2
L4006A OR L4007A LOW LIMIT
AQUASTAT¤ CONTROLLER
PROTECTORELAY¤
CONTROL
1

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.

2

USE L4006E FOR MANUAL RESET.

T

M2855A

Fig. 4. Hookup for oil-fired, summer-winter, hydronic
system with domestic hot water. This is typical
where control for domestic hot water is added, or
where each Aquastat Controller is mounted in a
separate location.

3

60-0915—4

L4006A,B,E,H AQUASTAT® CONTROLLERS

ADJUSTMENT

24 VOLT
THERMOSTAT
LOW WATER
CUTOFF

Set the differential to correspond with the boiler
manufacturer recommendations. To adjust models with
adjustable differential, rotate the wheel on the back of the
snap switch until the desired reading is aligned with the V
notch in the frame. The wheel provides an adjustment
from 5°F to 30°F (3°C to 17°C). Replace the cover on the
Aquastat Controller.

PRESSURE
CONTROL
L1
(HOT)
L2
1

2 L4006A OR
L4007A
LOW LIMIT
AQUASTAT¤
CONTROLLER

GAS
VALVE

PILOTSTAT¤
CONTROL

1

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.

2

USE L4006E FOR MANUAL RESET.

Adjust the control point to correspond with the boiler
manufacturer recommendations. To adjust, insert a
screwdriver in the slotted screw type head located
beneath the window in the cover. Turn the scale to the
desired control point.

M2856

Fig. 5. Typical hookup for gas-fired system with
domestic hot water.

Manual Reset
When the device includes manual reset (L4006E and H),
be sure to press the red reset button on the front of the
case to make sure that the controller is not locked out on
safety. When checking out the system, adjust the control
point low enough so the temperature of the controlled
medium reaches the high limit setting, the burner shuts
off, and the Aquastat Controller locks out. When the
temperature of the controlled medium drops to the high
limit setting minus differential, push the manual reset
button and the system should be operative again. Reset
control to proper high limit setting.

OPERATION
For proper selections of settings, follow boiler
manufacturer recommendations:
1.

High limit controller: Shuts off burner when water
temperature exceeds high limit setting. Burner
restarts when temperature drops to high limit
setting minus the temperature differential.

NOTE: If L4006E or H, see Manual Reset section.
2.
3.

CHECKOUT

Low limit controller: Maintains minimum boiler temperature for domestic hot water. Turns boiler on at
temperature setting, less differential.
Circulator controller: Prevents circulation of water
that is not hot enough. Breaks circulator circuit at
temperature setting minus differential and remakes
at setting.

60-0915—4

Check to make certain that the Aquastat Controller has
been installed and adjusted properly. Put the system into
operation and observe the action of the device through
several cycles to make certain that it provides proper
control of the system as described in the Operations
section. Further adjustments can be made to meet more
exact comfort requirements.

4

L4006A,B,E,H AQUASTAT® CONTROLLERS

MATERIAL SAFETY DATA SHEET
Section 1. Product And Company
Identification

Date Released: October 8, 1999
Customer Response Center: 800-328-5111

Product Name: Heat Conductive Compound

Emergency Telephone Information: 888-809-3787

MSDS ID: DS9021

NFPA Ratings:

Synonyms: MS1699

Health 0; Flammability 1; Reactivity 0; Personal Protection B

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

PEL

TVL

#2 Lithium Complex Grease (70%):
Mineral Oil

64742-65-0

35-50

5 mg/m3

Mineral Oil

64742-62-7

20-25

5

mg/m3

Lithium Hydrostearate/Sebacate
Complex

68815-49-6

4-9

—

—

Zinc Alkyldithiophosphate

68649-42-3

0-2

—

—
10 mg/m3

5 mg/m3
5 mg/m3

Aluminum Paste (30%):
Aluminum, as Al

7429-90-5

20-25

15 mg/m3

Aliphatic Petroleum Distillates

8052-41-3

10-15

2900 mg/m3

525 mg/m3

Stearic Acid

57-11-4

1-2

—

—

Aromatic Petroleum Distillates

64742-95-6

1-2

5 mg/m3

5 mg/m3

Additional Information: Part No. 120650 (0.5 oz tube); Part No. 107408 (4 oz can); Part No. 197007 (5 gallon
container). May also contain minute amounts of lithium and molybdenum lubricant compounds.

Section 3. Hazard Identification

Skin Contact: Remove excess with cloth or paper.
Wash thoroughly with mild soap and water. Obtain
medical attention if irritation develops and persists.

Acute Health Effects:
Skin: Excessive contact may cause skin irritation and
dermatitis.

Ingestion: Contact physician or local poison control
center immediately.

Eye: Direct contact with eye will cause irritation.

Inhalation: Remove patient to fresh air and obtain
medical attention if symptoms develop.

Inhalation: No adverse effects are expected.

Section 5. Fire Fighting Measures

Ingestion: Ingestion of product may cause nausea,
vomiting and diarrhea.

Material Flash Point: > 383°F (195°C). Will burn if
exposed to flame.

Chronic Health Effects:

Extinguishing Media: Carbon dioxide, dry chemical or
foam.

Existing skin rash or dermatitis may be aggravated by
repeated contact.

Special Fire Fighting Procedures: None.

OSHA Hazard Classifications: None.

Explosion Hazards: None. Aluminum powder can
react with water to release flammable hydrogen gas.
In the form of this product, this reaction is not
expected.

Carcinogenicity: Not considered to be a carcinogen by
either OSHA, NTP, IARC, or ACGIH.

Section 4. First Aid Measures

Section 6. Accidental Release Measures

Eye Contact: Flush eyes with water for 15 minutes.
Remove any contact lenses and continue to flush.
Obtain medical attention if irritation develops and
persists.

Scrape up and dispose of as solid waste in
accordance with state and federal regulations.

5

60-0915—4

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
Personal Protection.

Section 11. Toxicology Information.
No data available.

Ventilation: No special ventilation is required when
working with this product.

Section 12. Ecological Information

Respiratory Protection: None required.

Chemical Fate Information: Hydrocarbon components
will biodegrade in soil; relatively persistent in water.

Eye Protection: Not normally required. However, use
chemical safety goggles or faceshield if potential for
eye contact exists, especially if material is heated.

Section 13. Disposal Consideration
Dispose of as solid waste in accordance with local,
state and federal regulations.

Hand/Clothing Protection: Not normally required. Protective gloves and clothing are recommended, as
material is difficult to remove from skin and clothing.

Section 14. Transportation Information

Other Protective Equipment: None required.

DOT Classification: Not classified as hazardous.

Section 9. Physical and Chemical
Properties

Section 15. Regulatory Information
SARA Title III Supplier Notification: Include in Section
311/312 inventory reports if amounts exceed 10,000
pounds. Aluminum compounds are subject to the
reporting requirements under Section 313 of
Emergency Planning and Community Right-To-Know
Act of 1986 (40 CFR 372). Ingredients listed in TSCA
Inventory.

Appearance/Odor: Aluminum color, semi-solid
material, pleasant odor.
Solubility in Water: Negligible.
Specific Gravity: 0.86.

Section 10. Stability and Reactivity

Section 16. Other Information

Stability: Stable.

This information is furnished without warranty,
expressed or implied, except that is is accurate to the
best of our knowledge.

Reactivity: Hazardous polymerization will not occur.

Prepared by: PROSAR, 1295 Bandana Boulevard, Suite 335, St. Paul, MN 55108 (651-917-6100).

60-0915—4

6

7

60-0915—4

L4006A,B,E,H AQUASTAT® CONTROLLERS

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Subject                         : Installation Instructions
Modify Date                     : 2001:12:19 13:09:00-06:00
Create Date                     : 1999:07:07 12:30:47Z
Page Count                      : 8
Creation Date                   : 1999:07:07 12:30:47Z
Mod Date                        : 2001:12:19 13:09:00-06:00
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Author                          : Honeywell
Metadata Date                   : 2001:12:19 13:09:00-06:00
Creator                         : Honeywell
Title                           : 60-0915 - L4006A,B,E,H Aquastat Controllers
Description                     : Installation Instructions
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