Specifications

Aquastat Controllers
70-6910 193
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L4103 Combination Aquastat® and High Limit Controller
The L4103A,B is an immersion-type controller for oil-fired water
heaters. The Aquastat® Controller senses water temperature and
cycles the burner through the oil primary. The high-limit controller
breaks the circuit to the burner on a temperature rise past the
factory-set setpoint. The L4103C is an immersion-type controller
for gas systems that provides water temperature regulation. The
high-limit controller breaks the circuit to the burner on a
temperature rise past the factory-set setpoint.
• L4103A,B,C have a sensing element and a high limit sensor with
automatic reset.
• Mounts on a horizontal immersion well in water heater wall.
• Adjustable temperature setting scale.
• Fluid-filled element operates SPST, Micro Switch™ snap-acting
switch.
• Integral, nonadjustable high limit. L4103C is an immersion controller
for gas systems.
• L4103A,B is an immersion controller for oil systems.
Dimensions in inches (millimeters)
Case Dimensions: 4 3/32 in. wide x 3 7/8 in. high x 2 11/16 in. deep
(104 mm wide x 99 mm high x 68 mm deep.)
Operating Temperature Range: 100 F to 240 F stop set at 150 F
(Scale marked- Hot-Normal-Warm) (38 C to 116 C stop set at 66 C
(Scale marked- Hot-Normal-Warm)
Electrical Ratings:
Full Load:
5A @ 240 Vac; 8A @ 120 Vac
Locked Rotor: 30A @ 240 Vac; 48A @ 120 Vac
Approvals:
Underwriters Laboratories, Inc. UL Component Recognized: File No.
MP466, Guide No. MBPR2.
M6806A
MAXIMUM INSERTION
3-3/8 OR 5 (86 OR 127)
INSULATION
DEPTH
2-1/4 OR 4
(57 OR 102)
1-3/8
(35)
1-13/16
(46)
1-3/16
(30)
KNOCKOUT FOR 1/2 INCH CONDUIT (6)
WELL-CLAMP SCREW
1-13/64
(31)
3-7/8
(99)
1-13/64
(31)
2-3/64 (52)
4-3/32 (104)
2-11/16 (68)
3/4
(19)
3/4-14 NPT
Product Number Application
Differential
Temperature
Well Spud
Size Insulation Depth
Switching Action Mounting(F) (F) (inch) (mm) (inch) (mm)
L4103A1019 High Limit 7 F ± 4 F 3.9 C ±2 C 3/4 in.
NPT
19 mm
NPT
4 in. 102 mm SPST, contacts break
on temperature rise.
Mounts on a horizontal immersion
well in water heater wall.
L4103A1100 High Limit 7 F ± 4 F 3.9 C ±2 C 3/4 in.
NPT
19 mm
NPT
2 1/4 in. 57 mm SPST, contacts break
on temperature rise.
Mounts on a horizontal immersion
well in water heater wall.