PRODUCT DATA
® U.S. Registered Trademark
Copyright © 1995 Honeywell Inc. • All Rights Reserved
L8100A,B,C Aquastat
®
Controllers
GENERAL
L8100A,B, and C are immersion type controllers for
regulating and limiting the tank temperature in water heaters.
As the water temperature rises past the setpoint, the
controller switches off the gas valve.
FEATURES
•L8100A regulates tank temperature and provides
energy cutoff (ECO) action on a temperature rise past
the setpoint.
•L8100B regulates temperature and provides ECO
action on a temperature rise past the setpoint. This
model includes a second sensing element that senses
average water temperature to minimize stacking.
•L8100C includes a second sensing element that
senses average water temperature to minimize
stacking, but does not include ECO action.
•Fluid filled element operates single pole single throw
(spst) snap-acting Micro Switch™.
•Energy cutoff (ECO) switch enclosed in factory
installed well of L8100A,B interrupts the thermocouple
circuit or main valve before the tank reaches
maximum temperature of 210°F (99°C).
•Internal adjustment screw.
•Immersion well is factory installed to the controller.
•Special switch terminal provides three-wire hookup
from Aquastat® controller to gas valve.
• Four terminal models for manual reset with S86/
VR8204/VR8440.
Contents
General ............................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Operation and Checkout ..................................................... 8
60-2336-3
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3 2
SPECIFICATIONS
IMPORTANT
The specifications given in this publications do not
include normal manufacturing tolerances. Therefore,
an individual unit may not exactly match the listed
specifications. Also, this product is tested and
calibrated under closely controlled conditions, and
some minor differences in performance can be
expected when those conditions are changed.
Models:
L8100A Aquastat® Controller. Regulates water
temperature. Includes energy cutoff (ECO) switch that
breaks controller circuit on a temperature rise above
the setpoint.
L8100B Aquastat® Controller. Regulates water
temperature. Has a second sensing bulb that minimizes
stacking by sensing the average tank temperature.
Includes ECO switch which breaks controller circuit on
a temperature rise above the setpoint.
L8100C Aquastat® Controller. Regulates water
temperature. Has a second sensing bulb that minimizes
stacking by sensing the average tank temperature.
Electrical Ratings:
2A maximum at 24 Vac.
Differential:
Fixed, 5°F (3°C) for controller: 20°F (11°C) for ECO switch.
Maximum Tank Temperature:
210°F (99°C).
Temperature Range:
L8100A: 100°F to 240°F (38°C to 116°C) with factory set
stop to prevent setting above 160°F (71°C).
L8100B,C: 100°F to 180°F (38°C to 82°C).
Pressure Rating:
255 psi (1758 kPa).
Sensing Bulb:
Liquid (toluene) filled; 3/8 in. (10 mm) capsule.
Immersion Well:
1/2 in (13 mm) or 3/4 in. (19 mm) NPT. See Fig. 2 for
dimensions. All zinc plated except L8100B1094 and
L8100B1185.
Capillary Length (for Remote Bulb):
24-5/8, 30, 39, 42, or 54 in. (625, 762, 991, 1067, or
1372 mm).
Insertion Depth:
See Fig. 2.
Insulation Depth:
See Fig. 2.
Finish:
Gray.
Dimensions:
See Fig. 1 for controller dimensions; see Fig. 2 for immersion
well dimensions.
M4747
KNOCKOUT FOR 3/4 IN. (19 MM)
CONDUIT
SIMILAR KNOCKOUT
ON BOTTOM
1
(25)
15/16
(24)
2-1/8 (54)
5-5/8
(144)
3/4
(19)
2 (51)
ELEMENT
Fig. 1. Approximate dimensions of the L8100 Aquastat®
Controller in in. (mm).
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number, or specify:
1. Model number.
2. Application.
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 Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Relations
Honeywell, 1885 Douglas Drive North
Golden Valley, Minnesota 55422-4386
In Canada—Honeywell Limited/Limitee, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service
offices in all principal cities of the world.
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3
3
Available Options:
External adjustment screw and visible control point scale.
Factory set stop at 140°F (60°C).
Approvals:
Underwriters Laboratories Inc. Component Recognized:
File No. MP466, Guide Number MBPR2.
American Gas Association Design Certified: Report
Number 23-11B.
Part Available:
110641 Jumper to convert four-terminal L8100 to three-
terminal L8100.
1/2 OR 3/4 — 14 NPT
C
B
A
M4746
CONTROLLER WELL REMOTE WELL
A INSULATION DEPTH
B INSERTION DEPTH
C WELL DIAMETER
IN. MM
2-1/4
5
7/16
57
127
11
1-1/2 OR 2-1/2
3
7/16
38 OR 64
76
11
TANK WALL
IN. MM
Fig. 2. Approximate dimensions for the controller
immersion well and remote immersion well in in. (mm).
INSTALLATION
When Installing this Product...
쐃Read instructions carefully. Failure to follow them could
damage the product or cause a hazardous condition.
쐇Check ratings and descriptions given in the
specifications to make sure the product is suitable for
your application.
쐋Installer must be a trained, experienced service
technician.
쐏After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Disconnect power before installation to prevent
electrical shock or equipment damage.
Mounting Direct Immersion Well
The manufacturer usually provides a tapping for insertion of
the controller sensing element. This tapping is located at a
point where typical water temperature can be measured.
Follow the instructions furnished by the system manufacturer,
if available, or use the procedure below. See Fig. 3.
UPPER
SENSING BULB
SENSING BULB AND
ECO SWITCH LOCATION
L8100A L8100B,C
THERMOCOUPLE
AND PILOT BURNER
MAIN BURNER
M4759
Fig. 3. Location of L8100A,B,C Aquastat® Controllers.
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3 4
IMPORTANT
The controller immersion well is factory-installed to
the controller. Do not remove the immersion well,
this could damage the ECO switch.
쐃If system is filled, drain to a point below the tapping.
쐇Remove plug from tapping.
쐋If tapping is suitable, carefully screw immersion well
into tapping. Do not tighten or apply force to the
controller case.
쐏Fill tank. Make sure that well is screwed in tightly
enough to prevent leakage.
Mounting Remote Bulb (L8100B and L8100C)
The remote temperature sensing bulb is installed in an
immersion well (Fig. 4) or located near a capillary
compression fitting (Fig. 5) that extends into the upper portion
of the tank to prevent stacking.
Immersion Well Fitting
The immersion well must snugly fit the sensing bulb for good
thermal response. Install as follows:
쐃Use tapping provided by tank manufacturer, if possible,
or select an area where typical water temperature is
best measured.
쐇If tank is filled, drain to below point where bulb will be
installed.
쐋Screw well into tank.
쐏Insert bulb into well, pushing tubing until bulb bottoms
in well.
쐄Attach mounting clamp end of well spud. Loosen draw
nut and spread jaws of clamp with screwdriver if
necessary.
쐂With mounting clamp attached to well spud (make sure
jaws of clamp hook over ridge at end of spud, as shown
at points A in Fig. 4), adjust tubing to fit through
mounting clamp groove, as shown at point B in Fig. 4.
쐆Tighten draw nut until mounting clamp is firmly attached
to well spud and tubing is held securely in place.
CAUTION
Do not secure draw nut so tightly that mounting clamp
collapses tubing.
Capillary Compression Fitting
쐃Use tapping provided by manufacturer, if possible, or
select an area where typical water temperature is best
measured.
쐇If tank is filled, drain to below point where bulb will be
installed.
쐋Screw fitting into boiler tank tapping.
쐏Place packing nut on tubing.
쐄Slide bulb completely through fitting.
쐂Place composition disk and four slotted brass washers
on tubing in order shown in Fig. 5.
Turn brass washers
so slots are 180 degrees apart.
쐆Slide seal assembly into fitting and tighten packing nut.
M8777
WELL
BULB
SPUD
MOUNTING
CLAMP
A
DRAW
NUT
TUBING
B
INSERT— MOUNTING CLAMP
SCREWDRIVER
SPREAD JAWS
TO FIT OVER
RIDGE ON
WELL SPUD
JAWS
Fig. 4. Immersion well fitting for L8100 remote bulb.
COMPOSITION DISK
(SLOTTED)
BOILER PLUG
CAPILLARY TUBING
EXAMPLE OF SLOTTED WASHERS
ASSEMBLED
IN PAIRS:
PACKING NUT
M8816
IMMERSION
BULB
Fig. 5. Capillary compression fitting for
L8100 remote bulb.
Wiring
Disconnect power supply before installation to prevent
electrical shock or equipment damage. All wiring must comply
with local codes and ordinances regarding wire size, type of
insulation, enclosure, etc. Fig. 6 through 11 show typical
Powerpile® (millivolt) gas control connections; Fig. 12 and 13
show typical connections for 24 Vac systems; Fig. 14 through
16 show an L8100 hookup with an S86E,F,G, or H
Intermittent Pilot System.
Some four-terminal models are shipped with jumper in place
for use as three-terminal models. Remove jumper for four-
terminal operation.
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3
5
TH
TH
PP
PP
2
1
1
2
VS890
VALVE OPERATOR
COIL
PILOTSTAT® POWER
UNIT COIL
POWERPILE®
MILLIVOLT
GENERATOR
ECO SWITCH
CONTROLLER
L8100A,B
DOTTED LINE SHOWS INTERNAL WIRING.
SELECTED MODELS HAVE 3/16 AND 1/4 IN. TAB TERMINALS.
M4748
Fig. 6. L8100A,B hookup with VS890 where
controller cuts out main valve and ECO switch
cuts out pilot safety valve.
TH
TH
PP
PP
2
1
1
2
VS890
VALVE OPERATOR
COIL
PILOTSTAT® POWER
UNIT COIL
POWERPILE®
MILLIVOLT
GENERATOR
ECO SWITCH
CONTROLLER
L8100A,B
DOTTED LINE SHOWS INTERNAL WIRING.
SELECTED MODELS HAVE 3/16 AND 1/4 IN. TAB TERMINALS.
M4749
Fig. 7. L8100A,B hookup with VS890 where controller and
ECO switch are placed in series to cut out main valve.
TH
TH
PP
PP
3
12
1
2
3
VS820
GAS VALVE
VALVE OPERATOR
COIL
PILOTSTAT® POWER
UNIT COIL
POWERPILE®
MILLIVOLT
GENERATOR
ECO SWITCH
CONTROLLER
L8100A,B
USE 4-TERMINAL VS820 GAS VALVE.
DOTTED LINE SHOWS INTERNAL WIRING.
SELECTED MODELS HAVE 3/16 AND 1/4 IN. TAB TERMINALS.
M4750
Fig. 8. L8100A,B hookup with four-terminal VS820
where controller cuts out main valve and ECO
switch cuts out pilot safety valve.
3
2
1
1
2
3
VS820
VALVE OPERATOR
COIL
PILOTSTAT® POWER
UNIT COIL
POWERPILE®
MILLIVOLT
GENERATOR
ECO SWITCH
CONTROLLER
L8100A,B
USE 3-TERMINAL VS820 GAS VALVE.
DOTTED LINE SHOWS INTERNAL WIRING.
SELECTED MODELS HAVE 3/16 AND 1/4 IN. TAB TERMINALS.
M4751
TH
TH
PP
PP
Fig. 9. L8100A,B hookup with three-terminal VS820
where controller and ECO switch are placed in
series to cut out main valve.
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3 6
TH
TH
PP
PP
2
1
1
2
VS890
VALVE OPERATOR
COIL
PILOTSTAT® POWER
UNIT COIL
POWERPILE®
MILLIVOLT
GENERATOR
L8100C
DOTTED LINE SHOWS INTERNAL WIRING.
INSTALL FIELD JUMPER BETWEEN TERMINALS TH AND PP.
M4752
Fig. 10. L8100C hookup with VS890 to cut out main valve.
1
1
VS820
VALVE OPERATOR
COIL
PILOTSTAT® POWER
UNIT COIL
POWERPILE®
MILLIVOLT
GENERATOR
L8100C
DOTTED LINE SHOWS INTERNAL WIRING.
M4753
TH
TH
PP
PP
Fig. 11. L8100C hookup with three-terminal VS820 to cut
out main gas valve.
3
2
1
2
3
V800
VALVE OPERATOR
COIL
ECO SWITCH
CONTROLLER
L8100A,B
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
DOTTED LINE SHOWS INTERNAL WIRING.
SELECTED MODELS HAVE 3/16 AND 1/4 IN. TAB TERMINALS.
M4754
TH
TH
PP
PP
L1
(HOT)
L2
1
Fig. 12. L8100A, B hookup with V800 to
cut out main valve.
2
1
2
V800
VALVE OPERATOR
COIL
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
DOTTED LINE SHOWS INTERNAL WIRING. M4755
TH
TH
PP
PP
L1
(HOT)
L2
1
L8100C
Fig. 13. L8100C hookup with V800 to cut out main valve.
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3
7
1
2
3
3
2
ECO SWITCH
CONTROLLER
L8100A,B
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
S86E AND F MODELS ARE AVAILABLE WITH OR WITHOUT TH-R AND TH-W TERMINALS.
SELECTED MODELS HAVE 3/16 AND 1/4 IN. TAB TERMINALS. M4756
L1
(HOT)
L2
1
25V
25V
TH-R
TH-W
MV
MV/PV
PV
GND
S86E,F,G,H
TO GAS
VALVE
GND
1
2
3
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
S86E AND F MODELS ARE AVAILABLE WITH OR WITHOUT TH-R AND TH-W TERMINALS.
SELECTED MODELS HAVE 3/16 AND 1/4 IN. TAB TERMINALS. M4758
L1
(HOT)
L2
1
25V
25V
TH-R
TH-W
MV
MV/PV
PV
GND
S86E,F,G,H
TO GAS
VALVE
3
ECO SWITCH
CONTROLLER
L8100A,B
GND
Fig. 15. Four-terminal L8100A,B hookup with S86E,F,G,H intermittent pilot system.
Fig. 14. Three-terminal L8100A,B hookup with S86E,F,G,H intermittent pilot system.
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3 8
1
2
3
VR8440 VALVE
TERMINALS
3
2
ECO SWITCH
CONTROLLER
L8100A,B
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
FACTORY-INSTALLED WIRES, DO NOT REMOVE.
SELECTED MODELS HAVE 3/16 AND 1/4 IN. TAB TERMINALS. M4757
TH-TR
TH TR
L1
(HOT)
L2
1
25V
25V
TH-R
TH-W
MV
MV/PV
PV
GND
S86H
GND
Fig. 16. Four-terminal L8100B manual reset hookup with S86H and VR8440.
OPERATION AND CHECKOUT
Operation
When tank temperature rises past the setpoint, the liquid fill in
the sensing element expands and activates the snap-acting
switch, closing the gas valve. When the water temperature
drops below the differential, the switch opens the gas valve
and the burner begins heating the water. The ECO switch will
break the circuit to the Powerpile® millivolt generator or 24
Vac main valve before the water temperature rises to 210°F
(99°C).
The second element of the L8100B,C is located at the top of
the tank. These two elements sense the average temperature
in the tank. If a stacking condition begins, the L8100B,C will
close the valve before the top tank temperature becomes
excessive.
Adjusting
Adjust the control point to agree with the manufacturer’s
recommendations. To adjust, remove the cover and set the
scale to the desired control point (see Fig. 17).
SETPOINT SCALE
CONTROLLER
TERMINALS
ECO SWITCH TERMINALS
(ON L8100A,B ONLY)
M4760
Fig. 17. Internal view of the L8100.
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3
9
Checkout
Check to verify the Aquastat® controller was 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. Further
adjustments can then be made to meet more exact comfort
requirements.
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3 10
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3
11
L8100A,B,C Aquastat
®
CONTROLLERS
60-2336—3 12
Helping You Control Your World
Home and Building Control
Honeywell Limited-Honeywell Limitée
740 Ellesmere Road
Scarborough, Ontario
M1P 2V9
60-2336—3 G.R. Rev. 10-95 Printed in U.S.A.
QUALITY IS KEY
Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
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