L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS
60-2105—07
2
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not
include normal manufacturing tolerances. There-
fore, this unit may not exactly match the listed spec-
ifications. Also, this product is tested and calibrated
under closely controlled conditions, and some minor
differences in performance can be expected if those
conditions are changed.
TRADELINE® Models
TRADELINE® models are selected and packaged to provide
ease of stocking, ease of handling, and maximum
replacement value. TRADELINE model specifications are the
same as those of standard models, except as noted below.
TRADELINE Model Available:
L6081A Multiple Aquastat
Controller.
Additional Features:
TRADELINE pack with cross reference
label and special instruction sheet, tube of heat-conduc-
tive compound and setting stops.
Standard Models
Refer to Table 1 for model specifications.
Ranges:
High Limit: 130°F (55°C) to 240°F (116°C). Stops burner if
boiler temperature exceeds setpoint.
Low Limit: 110°F (44°C) to 220°F (105°C). Controls burner
during thermostat off periods to maintain boiler water
temperature.
Circulator: 110°F (44°C) to 220°F (105°C). Permits circulator
operation only if boiler water temperature exceeds low
limit setting.
a
Some models are shipped less well; if well is needed, refer to form 68-0040 for ordering information.
b
Device is less case and cover.
Scale Markings:
For Fahrenheit models:
High Limit: 160, 180, 200, 220°F.
Low Limit or Circulator: 120, 140, 160, 180, 200°F
For Celsius models:
High Limit: 55, 65, 75, 85, 95°C.
Low Limit or Circulator: 45, 55, 65, 75, 85, 95°C.
Differentials:
High Limit: 10°F (6°C) nominal.
Low Limit or Circulator:
L6081A,C: 10 to 25°F (6° to 14°C) adjustable.
L4081A,B: 10°F (6°C) nominal or 10° to 25°F (6° to 14°C)
adjustable.
Maximum Pressure Rating:
Well mounted: 200 psi (1380 kPa).
Direct Immersion: 100 psi (690 kPa).
Maximum Ambient Temperature:
At switches: 150°F (66°C).
At sensing element: 265°F (130°C).
Jumper:
The 128975 Push-in Field Addable Jumper (included) can be
inserted in the slot between R-R terminals to simplify wir-
ing. (Insert with formed legs up in slot labeled jumper. Be
sure to insert fully to positive stop.)
Mounting Dimensions:
See Fig. 1 and 2.
Approvals:
Underwriters Laboratories Inc. Listed (L4081A,B and
L6081A): File No. MP466, guide No. MBPR. Component
Recognized (L6081C): File No. MP466, Guide No. MPBR2.
Canadian Standards Association Component Recognized
(L4081A,B and L6081A): File No. LR1620, Guide No. 400-
E-0.
Table 1. Model Specifications.
Model Number
Insertion Type
a
High Temperature Side
Low Temperature Side
Switching
Action on Temperature
Rise to Setpoint
Switching
Action on Temperature
Rise to Setpoint
L4081A
Well
Spst High Limit Breaks
Spst Low Limit
Breaks
L4081B
Spst Circulator
Makes
L6081A
Spdt Low
Limit/Circulator
Breaks R-B
Makes R-W
L6081C
b
