MYERS DE Serie Instructions D'utilisation page 4

Installation / Operation
Piping
Piping must not be smaller than pump discharge.
The rate of flow in the discharge pipe must keep any
solids present in suspension in the fluid. To meet minimum
flow requirements of 2 feet per second (61 cm/sec) in dis-
charge line, size pipe as follows:
TABLE I
For A Pipe
Size of:
2 (51 mm)
"
2-1⁄2 (64 mm)
"
3 (76 mm)
"
Use a 2" (51 mm) minimum check valve in pump dis-
charge to prevent backflow of liquid into sump basin. The
check valve should be a free flow valve that will easily
pass solids. Be sure check valve installation complies with
local codes.
NOTE: For best performance of check valve when han-
dling solids, do not install it with discharge more than 45°
above the horizontal. Do not install check valve in a verti-
cal position as solids may settle in valve and prevent
opening on startup.
Drill a 3/16" (5 mm) hole in discharge pipe about 1 to 2"
(25-50 mm) above pump discharge connection (but below
check valve) to prevent airlocking the pump.
ELECTRICAL
Risk of electrical shock and fire. Be sure that
power supply information (Voltage/Hertz/Phase) on pump
motor nameplate matches incoming power supply exactly.
Install pump according to all electrical codes that apply.
Hazardous voltage. Can shock, burn, or
cause death. When installing, operating, or servicing this
pump, follow safety instructions below.
1. DO NOT splice the power cord, submerge electrical
cord plug, or use extension cords.
2. DO NOT handle or service pump while it is connect-
ed to power supply.
3. DO NOT operate pump unless it is properly grounded.
Wire 3-phase pump directly into grounded terminal
block in automatic float or pump controller box.
Power cord on single-phase units is a 3-wire conductor
with 3-prong grounding-type plug. Do not modify cord
or plug. When using with plug-in receptacle, plug
pump into a 3-wire, grounded, grounding-type recep-
tacle only. Connect pump according to all applicable
codes.
Minimum
Flow Rate is:
21 GPM (79.5 L/M)
30 GPM (113.5 L/M)
48 GPM (182 L/M)
For automatic operation, plug or wire pump into an auto-
matic float switch or pump controller. For continuous
operation, plug directly into an electrical outlet or wire
directly into switch box. Connect pump to its own individ-
ual branch circuit with nothing else on the circuit. For
fuse/circuit breaker requirements see "Specifications" on
Page 2.
Risk of fire or explosion if 3-phase pump
runs backward in septic tank. Running this pump back-
wards can cause the motor to burn out and may cause
an explosion if fumes are present.
Check rotation before installing this pump in the tank. To
do this, momentarily connect the pump to the power sup-
ply ("bump" it) while looking into the discharge port with
a flashlight. The rotation should match the arrow on the
rotation label on the pump.
NOTE: This pump's impeller design causes it to draw
more amps running backwards than running forward. To
check rotation on an installed pump, start the pump for 5
seconds or less and take an amp reading on one leg. Stop
the pump, reverse any two motor leads, and repeat. The
connection giving the lower amp reading is correct.
OPERATION
In single-phase units, an automatic overload protector in
the motor will protect motor from burning out due to over-
heating/overloading. When motor cools down, protector
automatically resets and starts motor. Three-phase units
require external overload protection.
If overload trips frequently, check for cause. It could be a
stuck impeller, wrong/low voltage, or electrical failure in
motor. If an electrical failure in the motor is suspected,
have it serviced by a competent repairman.
NOTE: Do not allow pump to run in a dry sump. It will
void the warranty and may damage the pump.
Pump is permanently lubricated. No oiling or greasing is
required.
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