Goulds Pumps CV 3171 - IOM - Manual (Page 47)

CV 3171 IOM 05/11 47
APPENDIX I
FLOAT CONTROLS
Square D 9036 Simplex and 9038
Duplex.
A single float and rod assembly is used with the
9036 float switch on a simplex unit or the 9038
Duplex alternator. Refer to manufacturer’s wiring
diagram for correct wiring of the switch.
1. If a Pit Cover is supplied by Goulds with the
pumps, the holes for the float switch support
pipe (435) and the upper rod guide (337) will be
located and installed by the factory. If the pit
cover is to be supplied by others, it will be
necessary to locate, drill, and tap the holes prior
to installing the switch. See Figure 45 for hole
size and locating procedure.
2. Attach the lower guide arm (366) and the float
rod guide (336) to the correct suction cover bolt
(based on layout) prior to installing the pump in
the sump.
3. Thread the float switch support pipe (435) and
the upper rod guide (337) into the pit cover.
4. Attach float switch bracket (398) to the float
switch support pipe.
5. Install the Float Rod (334), Collars (335), and
Float (342) as shown on figure 46.
The on and off levels are controlled by adjusting the
collars (335). As the liquid level rises, the float rises
to contact the upper collar and the upward
movement of the float rod causes the mechanical
switch inside the control to close, completing the
circuit to the starter. Operation continues until the
liquid level drops low enough for the float to contact
the lower collar. This pulls the rod down opening the
switch and turning off the pump.
The Square D 9038 Duplex Alternator is installed
the same as above. The difference is in the
operating sequence. The first pump will start as the
water level rises allowing the float to contact the
upper collar. When the water level drops down and
shuts off the first pump, a lever arm inside the
control mechanically switches to the second pump
and it will come on for the next cycle.
Should the first pump fail to keep up with demand,
or not come on at all, a continued rise in the level
will turn both pumps on. Both pumps will run until
the low water level is reached. Should both pumps
be unable to keep up with demand, an optional high
water alarm switch can be supplied in the Alternator
to close a switch if the water level rises past the
Figure 46
Figure 45
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