Flint & Walling Commander Pro 300 - Manual (Page 6)

6
95 North Oak Street • Kendallville, IN 46755
installation where the pump pressure can exceed
the pressure tank’s maximum working pressure
or on systems where the discharge line can be
shut off or obstructed. The relief valve drain port
should be piped to a drain (Figures 1 & 2).
WARNING: Not providing a relief valve can cause
extreme over pressure, which could result in personal
and/or property damage.
17. Pitless Adapter — A pitless adapter provides
below grade discharge while maintaining above
grade access to the well. Placed below the frost
line they are frost proof and also prevent well
contamination by providing a water tight seal
between the vertical drop pipe and the horizontal
service pipe connection (Figure 1).
18. Well Seal — On well seal installations the
piping in the well projects above the well and is
connected above ground to the system piping by
means of a tee or elbow. Since the plumbing is
above ground, it must be protected from freezing
(Figure 2).
19. Submersible Cable — Submersible power cable
must be UL listed for submersible pump application.
Selecting the proper cable size is important.
Undersized cable results in a too low voltage supply
to the pump motor and ultimate motor failure.
Oversized cable is costly and not necessary. Refer
to cable selection chart for proper cable selection.
Cable is selected for the maximum pump setting
plus the offset distance to the service entrance.
20. Ground Wire — The National Electric Code (NEC
250-43) requires a separate ground wire be run
down the well to the submersible pump and to be
connected to all exposed metal parts of the pump
and motor. Refer to the most recent National
Electric Code (NEC) for additional grounding
information. All wiring should be done by a
competent electrician.
INSTALLATION
SUBMERSIBLE CABLE INSTALLATION
1. Check power source. Check electrical supply for
correct fusing, correct wire size, and adequate
grounding and transformer size.
WARNING: Since most submersible pump problems
are electrical, it is very important that all electrical
work be done properly. Therefore, all electrical hook-
up work or electrical service work should be done ny a
qualified electrician or serviceman only!
2. Follow wiring directions in the control box and
make momentary tests to see that the motor
runs. Do not run pump dry for more than
three (3) seconds. If test is satisfactory, proceed
to Step 3 (cable splice).
3. First check cable size against the Submersible
Wire Size Chart. Use extreme care; this is a very
important step. If required length falls between
two wire sizes, use the larger of the two wire
sizes (smaller number).
IMPORTANT: Use of wire sizes smaller than those
specified in the charts will cause low starting voltage,
may cause early pump failure and will void the
warranty. Larger wire sizes may always be used for
better operating economy.
4. Splice motor leads to submersible cable with
commercially available potting, heat shrink
splicing kits or by careful tape splicing. Tape
splicing should use the following procedure.
a) Strip individual conductor of insulation only as
far as necessary to provide room for a stake
type connector. Tubular connectors of the
staked type are preferred. If connector O.D. is
not as large as cable insulation, build-up with
rubber electrical tape.
b) Tape individual joints with rubber electrical
tape, using two layers; the first extending two
inches beyond each end of the conductor
insulation end, the second layer two inches
beyond the ends of the first layer. Wrap
tightly, eliminating air spaces as much as
possible.
c) Tape over the rubber electrical tape with #33
Scotch electrical tape, (Minnesota Mining Co.)
or equivalent, using two layers as in step “B”
and making each layer overlap the end of the
preceding layer at least two inches.
5. In the case of a cable with three conductors
encased in a single outer sheath, tape individual
conductors as described, staggering joints.
Total thickness of tape should be less than the
thickness of the conductor insulation.
GROUND WIRE INSTALLATION
WARNING: Motor frame must be connected to power
supply ground or fatal electrical shock may result.
IL0097
Figure 6
Staked Connector
Rubber Tape
PVC Electrical Tape
2”
2”
2”
2”
NOTE: All electrical wiring should be done by a
competent electrician.
1. Grounding the submersible pump is
accomplished by running a copper grounding
wire from the pump motor to the main electrical
system ground.