Bell & Gossett MM 217L User Manual
INSTRUCTION MANUAL
MM-217L
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 13/8(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/cm2)
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/
cm2)
150 psi
(10.5 kg/
cm2)
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 17/16(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/
cm2)
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.
&
'
3
Approximate
Distance Above
Cast Line Differential
Setting In. (mm) In. (mm)
Motorized
15
/16(24)
Valve Closed
5
/16(8)
Motorized
5
/8(16)
Valve Open
Burner On
5
/8(16)
3
/8(16)
Burner Off
1
/4(6.4)
Motorized 13/8(41)
3
/4(19)
Valve Closed
Motorized
5
/8(16)
Valve Open
Burner On
7
/8(22)
7
/8(22)
Burner Off 0 (0)
Values are ± 8” (3.2mm).
NOTE: Due to the slower operation of some
motorized valves, complete valve opening
or closing will occur at slightly different
levels than indicated above.
Model 158S
150 psi (10.5 kg/cm
2
) Levels
0 psi
(0 kg/
cm2)
150 psi
(10.5 kg/
cm
2
)
Pressure
Settings and Differential Pressures (continued)
150 psi
(10.5 kg/
cm2)
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 17/16(37)
3
/4(19)
Pump On
11/16
(17)
Burner Off -
3/8
(-16)
N/A
Model 158S-MD
0 psi
(0 kg/
cm2)
Pressure
150 psi (10.5 kg/cm2) Levels
NOTE: Due to the slower operation of some
motorized valves, complete valve opening
or closing will occur at slightly different
levels than indicated above.
BURNER OFF
BURNER ON
7
/8"
DIFFERENTIAL
(22mm)
MOTORIZED
VALV E
CLOSED
BURNER
OFF
NORMAL BOILER
WATER LINE
1
3
/8"
DIFFERENTIAL
(35mm)
MOTORIZED
VALV E
CLOSED
MOTORIZED
VALV E
OPEN
3
/4"
DIFFERENTIAL
(19mm)
MOTORIZED
VALVE
OPEN
CLOSED
3
/4"
DIFFERENTIAL
(19mm)
MOTORIZED
VALV E
CLOSED
BURNER
OFF
NORMAL BOILER
WATER LINE
1
13
/16"
DIFFERENTIAL
(46mm)
4
Values are ± 8” (3.2mm).
150 psi (10.5 kg/cm2) Levels
Approximate
Distance Above
Cast Line Differential
Setting In. (mm) In. (mm)
Pump #1 Off15/16(24)
5
/16(8)
Pump #1 On5/8(16)
Pump #2 Off5/8(16)
3
/8(16)
Pump #2 On1/4(6.4)
Pump #1 Off 13/8(41)
3
/4(19)
Pump #1 On5/8(16)
Pump #2 Off7/8(22)
7
/8(22)
Pump #2 On
0 (0)
Model 159S
0 psi
(0 kg/
cm2)
150 psi
(10.5 kg/
cm
2
)
Pressure
Settings and Differential Pressures (continued)
PUMP #1
OFF
PUMP #1
ON
NORMAL BOILER
WATER LINE
(19mm)
3
/4"
DIFFERENTIAL
PUMP #2 ON
AT CAST LINE
7
/8"
DIFFERENTIAL
(22mm)
PUMP #2
ON
PUMP #2
OFF
PUMP #1
OFF
PUMP #2
ON
PUMP #2 ON
AT CAST LINE
NORMAL BOILER
WATER LINE
1
3
/8"
DIFFERENTIAL
(35mm)
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