McDonnell & Miller 150E Series - Switch Settings and Flange Configuration; Flange Position Settings

3
BURNER
CUT-OFF LEVEL
AT CAST LINE
(22mm)
BURNER OFF
BURNER ON
7
/8"
PUMP
OFF
BURNER
OFF
BURNER
CUT-OFF LEVEL
AT CAST LINE
2
1
/16"
(52 mm)
NORMAL BOILER
WATER LINE
1
3
/16"
(30 mm)
PUMP OFF
PUMP ON
NORMAL BOILER
WATER LINE
When the water level in the boiler drops below the
middle probe, the circuit is broken which will acti-
vate the pump relay. When the water level rises
above the top probe, the circuit is made and the
pump relay is deactivated.
The distance between the top and middle probes is
adjustable. By turning the flange one bolt hole
clockwise, the distance can be increased by 7/16”.
When the water level in the boiler drops below the
bottom probe, the circuit is broken which will deacti-
vate the burner relay. When the water level is
restored to the middle probe, the burner relay will
be activated for auto reset controls only.
SWITCH SETTINGS:
Values are ±
3
/16” (6mm).
Flange in “B” PositionFlange in “A” Position
Burner Off has adjustable 0-60 second time delay.
Approximate
Distance Above
Cast Line Differential
Setting In. (mm) In. (mm)
Pump Off 1
5
/8 (41)
3
/4 (19)
Pump On
7
/8 (22)
Burner On
7
/8
(22)
7
/8 (22)
Burner Off 0 (0)
BURNER
CUT-OFF LEVEL
AT CAST LINE
(22mm)
BURNER OFF
BURNER ON
7
/8"
PUMP
OFF
BURNER
OFF
BURNER
CUT-OFF LEVEL
AT CAST LINE
1
5
/8"
(41mm)
NORMAL BOILER
WATER LINE
3
/4" (19 mm)
PUMP OFF
PUMP ON
NORMAL BOILER
WATER LINE
Burner Off has adjustable 0-60 second time delay.
Approximate
Distance Above
Cast Line Differential
Setting In. (mm) In. (mm)
Pump Off 2
1
/16 (52)
1
3
/
16
(30)
Pump On
7
/8 (22)
Burner On
7
/8
(22)
7
/
8
(22)
Burner Off 0 (0)