L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS
7
60-2105—07
Fig. 9. L6081A used with oil burner.
OPERATION
High Limit
The high limit opens and turns off the burner when the water
temperature reaches the setpoint. The high limit
automatically resets after the water temperature drops past
the setpoint and through the 10°F (6°C) differential.
Low Limit and Circulator
On a temperature rise, with the adjustable differential at the
minimum setting of 10°F (6°C) (also applies to fixed 10°F
[6°C] differential models), the burner circuit (R-B) breaks and
the circulator circuit (R-W) makes at the control setpoint. On
a temperature drop of 10°F (6°C) below the setpoint, the R-B
circuit makes and the R-W circuit breaks.
At any differential setting greater than 10°F (6°C), the R-B
make temperature and R-W break temperature remain the
same control setting minus 10°F (6°C). The R-B break and R-
W make temperatures are the setpoint temperature plus the
difference between the differential setting and 10°F (6°C).
Examples:
L4081A: Setpoint of 140°F (60°C); differential set at 25°F
(14°C). On a temperature rise, the switch breaks at 155°F
(69°C). On a temperature fall, the switch makes at 130°F
(55°C).
L4081B: Setpoint of 140°F (60°C); differential set at 25°F
(14°C). On a temperature rise, the switch makes at 155°F
(69°C). On a temperature fall, the switch breaks at 130°F
(55°C).
L6081A,B: Setpoint of 140°F (60°C); differential set at 25°F
(14°C). On a temperature rise, R-B breaks and R-W makes
at 155°F (69°C). On a temperature fall, R-B makes and R-W
breaks at 130°F (55°C).
SETTINGS
Because heating systems differ, follow the boiler
manufacturer recommendations when selecting temperature
settings.
Study the applicable chart in Fig. 10, which shows the
switching response to temperature changes.
With the cover off, set the high limit adjustment at the
temperature desired but
not
higher than recommended by the
boiler manufacturer (Fig. 4).
Set the low limit and/or circulator adjustment to obtain
temperature desired but
not less than
20°F (11°C) below the
high setting.
M8855
L1
(HOT)
L2
1
2
1
2
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
B TERMINALS ARE TAB TERMINALS.
SOLID
STATE
SWITCH
SAFETY
SWITCH
HEATER
B
2
4
3
1
B
R
R
W
BURNER MOTOR
OIL VALVE
IGNITION
SS
1K
1K2
1K1
F
F
T
T
R4184D PROTECTORELAY™ CONTROL
JUNCTION BOX
BLACK
ORANGE
WHITE
CIRCULATOR
L6081A
JUMPER
ADDED
24V
THERMOSTAT
1R
1R1
RA89A SWITCHING RELAY
CAD
CELL
