Operation – Bell & Gossett MM 217L Series 150S and 157S Low Water Cut-Offs/Pump Controllers User Manual
Page 2
2
Approximate
Distance Above
Cast Line
Differential
Setting
In. (mm)
In. (mm)
Pump Off
15
/
16
(24)
5
/
16
(8)
Pump On
5
/
8
(16)
Burner On
5
/
8
(16)
3
/
8
(16)
Burner Off
1
/
4
(6.4)
Pump Off
1
3
/
8
(41)
3
/
4
(19)
Pump On
5
/
8
(16)
Burner On
7
/
8
(22)
7
/
8
(22)
Burner Off
0
(0)
OPERATION
Maximum Pressure: 150 psi (10.5 kg/cm
2
)
Settings and Differential Pressures
Values are ± 8” (3.2mm).
Series 150S, 157S
150 psi (10.5 kg/cm
2
) Levels
150 psi (10.5 kg/cm
2
) Levels
0 psi
(0 kg/
cm
2
)
150 psi
(10.5 kg/
cm
2
)
Approximate
Distance Above
Cast Line
Differential
Setting
In. (mm)
In. (mm)
Pump Off
15
/
16
(24)
3
/
8
(16)
Pump On
9
/
16
(14)
Burner Off
0
(0)
N/A
Pump Off
1
7
/
16
(37)
3
/
4
(19)
Pump On
11
/
16
(17)
Burner Off
-
3
/
8
(-16)
N/A
Model 150S-MD, and 157S-MD
0 psi
(0 kg/
cm
2
)
150 psi
(10.5 kg/
cm
2
)
Pressure
Pressure
BURNER OFF
BURNER ON
7
/
8
"
DIFFERENTIAL
(22mm)
PUMP
OFF
BURNER
OFF
NORMAL BOILER
WATER LINE
1
3
/
8
"
DIFFERENTIAL
(35mm)
PUMP OFF
PUMP ON
3
/
4
"
DIFFERENTIAL
(19mm)
PUMP OFF
PUMP ON
3
/
4
"
DIFFERENTIAL
(19mm)
PUMP
OFF
BURNER
OFF
NORMAL BOILER
WATER LINE
1
13
/
16
"
DIFFERENTIAL
(46mm)
Enclosure rating: NEMA 1 General Purpose
PumpCircuit Rating (Amperes)
Voltage
Full Load
Locked Rotor
Pilot Duty
120 VAC
7.4
44.4
345 VA at
240 VAC
3.7
22.2
120 or 240 VAC
Electrical Ratings
Alarm Circuit Rating
Voltage
Amps
120 VAC
1
240 VAC
1/2
Motor Horsepower
Voltage
Hp
120 VAC
1/3
240 VAC
1/3
CAUTION:
A more frequent replacement interval may be necessary based on the condition of
the unit at time of inspection. McDonnell Miller s warranty is one (1) year from date
of installation or two (2) years from the date of manufacture.
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&
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