Operation – Xylem MM 235E Replacement Snap Switch Assembly SWA 150S 150S MD 158S 159S User Manual
Page 3
Pump Circuit 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
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)
BURNER
“CUT-OFF LEVEL”
AT CAST LINE
BURNER OFF
BURNER ON
7
/
8
"
DIFFERENTIAL
(22mm)
PUMP
OFF
BURNER
OFF
BURNER
“CUT-OFF LEVEL”
AT CAST LINE
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)
BURNER CUT-OFF LEVEL
3
/
8
" (9.5mm) BELOW
CAST LINE
OPERATION
3
Maximum Pressure: 150 psi (10.5 kg/cm
2
)
Electrical Ratings
Settings and Differential Pressures
Series 150S and 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
Alarm Circuit Rating
Voltage
Amps
120 VAC
1
240 VAC
1/2
Motor Horsepower
Voltage
Hp
120 VAC
1/3
240 VAC
1/3