Installation
Model API 3171 Installation, Operation, and Maintenance Manual
25
Float ball switches
Float balls are individual switches that are used in multiple configurations to control the pump
circuit. The float balls are suspended in the sump to the desired control level. When the fluid
level rises to the float ball, the switch begins to float. The float is either anchored to a pipe or
weighted. This allows the switch to tilt when the fluid continues to rise. When the float tilts, a
switch closes that you can use in order to turn the pump on, activate a high-level alarm, or
control any other electrical device.
Install the Square D 9036 simplex and 9038 duplex float controls
A single float and rod assembly is used with the 9036 float switch on a simplex unit or the 9038
duplex alternator. Refer to the wiring diagram from the manufacturer for the correct wiring of
the switch.
If a pit cover is supplied with the pump, the float switch support pipe (435) and the upper rod
guide (337) are installed by the factory. If the pit cover is supplied by others, you must locate,
drill, and tap the holes before you install the switch.
Figure 12: Location of the float, rod, and switch
1.
Diameter of the coverplate (A)
2.
Radius (B)
3.
CL of the pump
4.
Radius of 178.0 mm | 7.0 in.
5.
31.8 mm | 1.25 in. NPT float switch NTG
column
6.
9.5 mm | 0.38 in. NPT for the float rod guide
7.
203.0 mm | 8 in. diameter of float (standard)
Number
Coverplate diameter (A)
Radius (B)
1
559 mm | 22 in.
368 mm | 14.50 in.
2
673 mm | 26.50 in.
419 mm | 16.50 in.
3
787 mm | 31.00 in.
470 mm | 18.50 in.
1. Before you install the pump in the sump, attach the lower guide arm (366) and the float rod
guide (336) to the correct suction cover bolt (based on the layout).
2. Thread the float switch support pipe (435) and the upper rod guide (337) into the pit cover.
3. Attach the float switch bracket (398) to the float switch support pipe.
You can rotate the float switch around the center line of the pump on the radius (B).
4. Install the float rod (334), float (342), and collars (335).
Содержание Goulds Pumps API 3171
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