Brochure

54 63-8702
Aquastat
®
Controllers
L8100 Aquastat
®
Controller
L8100 are immersion type controllers for regulating and limiting the
tank temperature in water heater and hydronic systems. As the water
temperature rises past the setpoint, the controller switches off the
gas valve.
• Regulates temperature and provides energy cutoff (ECO) action on
a temperature rise past the setpoint.
• Includes a second sensing element that senses average water
temperature to minimize stacking.
• Fluid-filled element operates Micro Switch™ SPST snap-acting
switch.
• ECO switch interrupts the thermocouple circuit or main valve before
tank reaches 210°F (99°C) maximum temperature.
• Includes factory-installed immersion well on controller.
• Internal adjustment screw.
• Special switch terminal provides three-wire hookup from Aquastat
®
controller to gas valve.
Dimensions in inches (millimeters)
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
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
Operating Temperature Range: 100°F to 180°F (38°C to 82°C)
Differential Temperature:
Controller: 5°F (3°C), fixed.
Energy Cutoff Switch: 20°F (11°C), fixed.
Electrical Ratings: Millivolt – 2A maximum at 24 Vac
Mounting: Immersion Well
Temperature Range:
(ECO) Energy Cutoff: 190°F (88°C);
Tank Maximum: 210°F (99°C)
Dimensions: Case – 5 5/8 in. high x 2 in. wide x 2 1/8 in. deep (Case –
143 mm high x 51 mm wide x 54 mm deep)
Approvals, Underwriters Laboratories Inc.: UL Component Recognized:
File No. MP466, Guide No. MBPR2
Approvals, CSA: File No. 112491
Material Number Application Bulb Size Capillary Length Insulation Depth Switching Action Includes
L8100B1037/U High Limit 3/8 in. (10 mm) 42 in. controller well: 2 1/4 in. (57 mm)
remote well: 1 1/2 or 2 1/2 in. (38 mm or 64 mm)
SPST, contacts break
on temperature rise.
–
L8100B1094/U High Limit 3/8 in. (10 mm) 54 in. controller well: 2 1/4 in. (57 mm)
remote well: 1 1/2 or 2 1/2 in. (38 mm or 64 mm)
SPST, contacts break
on temperature rise.
Two zinc plated wells
and one well clamp for
remote well.
L8100B1128/U High Limit 3/8 in. (10 mm) 39 in. 1 1/2 in. (38 mm) SPST, contacts break
on temperature rise.
–