Install Instructions

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 1
3
/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/
cm
2
)
150 psi
(10.5 kg/
cm
2
)
Pressure
Settings and Differential Pressures (continued)
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 158S-MD
0 psi
(0 kg/
cm
2
)
Pressure
150 psi (10.5 kg/cm
2
) 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
VALVE
CLOSED
BURNER
OFF
NORMAL BOILER
WATER LINE
1
3
/8"
DIFFERENTIAL
(35mm)
MOTORIZED
VALVE
CLOSED
MOTORIZED
VALVE
OPEN
3
/4"
DIFFERENTIAL
(19mm)
MOTORIZED
VALVE
OPEN
CLOSED
3
/4"
DIFFERENTIAL
(19mm)
MOTORIZED
VALVE
CLOSED
BURNER
OFF
NORMAL BOILER
WATER LINE
1
13
/16"
DIFFERENTIAL
(46mm)