Aquastat L4006,7,8;L6006,7,8
15 60-2104—01
L1
(HOT)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
JUMPER
M8968C
HEATING LOAD
NO. 2
HEATING LOAD
NO. 1
R
R
B
B
W
W
2
1
L6008G
Fig. 31. Adjusting the differential. Use with L4006A,B;
L6008A.
L6008G Adjustable Interstage Differential
When the temperature at the sensing element rises above
the set point of the controller, the switch on the right makes
R-W. If the temperature continues to rise through the prese-
lectedinterstage differential of the controller, the switch on
the left makes R-W.
Conversely, on a temperature fall, the switch on the left
makes R-B, providing first step switching. If the temperature
continues to fall, the switch on the right makes R-B to pro-
vide sequencing of equipment. Aquastat Controller
TEMPERATURE
RISE
SETPOINT
(ADJUSTABLE)
LEFT SWITCH
DIFFERENTIAL
RIGHT SWITCH
DIFFERENTIAL
BREAKS
ON RISE
BREAKS
ON RISE
MAKES
ON FALL
MAKES
ON FALL
INTERSTAGE
DIFFERENTIAL
DIFFERENCE BETWEEN THE TEMPERATURES AT WHICH
THE TWO SWITCHES BREAK ON TEMPERATURE RISE.
SWITCHES OPERATE IN SEQUENCE. RIGHT SWITCH
FIRST-ON TEMPERATURE RISE.
1
2
1
2
2
M4671B
Fig. 30. Operation of L4008L.
2
OPERATION
ADJUSTMENTS
Adjust Differential
Set the differential to correspond with the boiler
manufacturer recommendations. To adjust models
with adjustable differential, rotate the wheel on
the back of the snap switch, (See Fig. 32), until
the desired reading is aligned with the V notch in
the frame. The wheel provides an adjustment from
5° F to 30° F (3° C to 17° C). Replace the cover
on the Aquastat Controller.
1
ADJUSTMENTS
Adjust the control point to correspond with the boiler
manufacturer recommendations. To adjust, insert a
screwdriver in the slotted screw type head located beneath
the window in the cover. Turn the scale to the desired
control point.
Adjust L6008G Interstage Differential
The L6008G Controller has an adjustable inter-
stage differential. The set point adjustment knob
determines the temperature at which the right
switch operates. The left switch can be adjusted
to operate from 3° F to 10° F (1.7° C to 5.6° C)
above the point of operation of the right switch.
See Figure 30 for the operation of the L6008G.
The interstage differential is adjusted by turn-
ing the star wheel with a narrow screwdriver
inserted into the rectangular hole in the chassis.
(See Fig. 32).
2
Circulator Controller
R-W terminals provide circulation control func-
tion (contacts close at set point on temperature
rise). Prevents circulation of water that is below
the desired heating temperature. Breaks circula-
tor circuit on temperature drop below setting less
differential; remakes on rise to setting.
Low Limit Controller
R-B terminals provide low limit switching func-
tion (contacts open at set point on temperature
rise). Maintains minimum boiler temperature for
domestic hot water. Turns on boiler at tempera-
ture setting, less differential.
3