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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.
SPECIFICATIONS
IMPORTANT
The specifications given in this publications do not
include normal manufacturing tolerances. There-
fore, 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.
General ................................................................................
Features ..............................................................................
Specifications .....................................................................
Installation ..........................................................................
Operation and Checkout .....................................................
PRODUCT DATA
Contents
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60-2336-04
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Summary of Contents for resideo Aquastat L8100A
- Page 1 L8100A,B,C Aquastat® Controllers PRODUCT DATA • 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. •...
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Page 2: Installation
L8100A,B,C AQUASTAT® CONTROLLERS Maximum Tank Temperature: Available Options: 210°F (99°C). External adjustment screw and visible control point scale. Factory set stop at 140°F (60°C). Temperature Range: L8100A: 100°F to 240°F (38°C to 116°C) with factory set stop Approvals: to prevent setting above 160°F (71°C). Underwriters Laboratories Inc. - Page 3 L8100A,B,C AQUASTAT® CONTROLLERS UPPER SENSING BULB SENSING BULB AND ECO SWITCH LOCATION L8100B,C L8100A THERMOCOUPLE AND PILOT BURNER MAIN BURNER M4759 Fig. 3. Location of L8100A,B,C Aquastat® Controllers. IMPORTANT 4. Insert bulb into well, pushing tubing until bulb bottoms The controller immersion well is factory-installed to in well.
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Page 4: Mounting Clamp
L8100A,B,C AQUASTAT® CONTROLLERS Some four-terminal models are shipped with jumper in place for use as three-terminal models. Remove jumper for four- terminal operation. L8100A,B JAWS SPREAD JAWS TO FIT OVER RIDGE ON CONTROLLER WELL SPUD SCREWDRIVER ECO SWITCH MOUNTING CLAMP DRAW MOUNTING SPUD... - Page 5 L8100A,B,C AQUASTAT® CONTROLLERS L8100A,B L8100C CONTROLLER ECO SWITCH POWERPILE® MILLIVOLT VS890 GENERATOR POWERPILE® VS820 MILLIVOLT VALVE OPERATOR GAS VALVE GENERATOR COIL VALVE OPERATOR COIL PILOTSTAT® POWER PILOTSTAT® POWER UNIT COIL UNIT COIL DOTTED LINE SHOWS INTERNAL WIRING. USE 4-TERMINAL VS820 GAS VALVE. INSTALL FIELD JUMPER BETWEEN TERMINALS TH AND PP.
- Page 6 L8100A,B,C AQUASTAT® CONTROLLERS L8100A,B L8100C (HOT) CONTROLLER (HOT) ECO SWITCH V800 V800 VALVE OPERATOR VALVE OPERATOR COIL COIL POWER SUPPLY. PROVIDE DISCONNECT MEANS AND POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. OVERLOAD PROTECTION AS REQUIRED. DOTTED LINE SHOWS INTERNAL WIRING. DOTTED LINE SHOWS INTERNAL WIRING.
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Page 7: Operation And Checkout
L8100A,B,C AQUASTAT® CONTROLLERS L8100A,B CONTROLLER ECO SWITCH S86E,F,G,H (HOT) TO GAS MV/PV VALVE TH-R TH-W 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 Fig. - Page 8 Resideo Technologies, Inc. 1985 Douglas Drive North, Golden Valley, MN 55422 1-800-468-1502 www.resideo.com 60-2336—04 M.S. Rev. 05-20 | Printed in United States © 2020 Resideo Technologies, Inc. All rights reserved. This product is manufactured by Resideo Technologies, Inc. and its affiliates.
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