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
1
3
/
8
(35)
3
/
4
(19)
Pump On
5
/
8
(16)
Burner On
7
/
8
(22)
7
/
8
(22)
Burner Off
0
(0)
NORMAL BOILER
WATER LINE
BURNER
CUT-OFF LEVEL
AT CAST LINE
7/8" (22 mm)
BURNER ON
BURNER OFF
CUT-OFF
LEVEL
NORMAL BOILER
WATER LINE
PUMP
OFF
BURNER
OFF
BURNER
CUT-OFF LEVEL
AT CAST LINE
1 3/8" (35mm)
CUT-OFF
LEVEL
NORMAL BOILER
WATER LINE
CUT-OFF
LEVEL
PUMP OFF
PUMP ON
3/4" (19mm)
OPERATION
Maximum Pressure:
50 psi (3.5 kg/cm
2
)
Electrical Ratings
Settings and Differential Pressures
Values are ±
8
” (3.2mm).
Series 42S
50 psi
(3.5 kg/
cm
2
)
Pressure
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.
•
&
'
Summary of Contents for McDonnell & Miller 42S Series
Page 1: ...INSTRUCTION MANUAL MM 231G...
