Piping; Pump Control Panels And Wiring; Wiring And Grounding; Selecting And Wiring Pump Control Panels And Switches - Xylem Bell & Gossett Explosion Proof 3XWC Directives D'installation, D'utilisation Et D'entretien

PIPING

Discharge piping should be no smaller than the pump
discharge diameter and kept as short as possible, avoiding
unnecessary fittings to minimize friction losses.
Install an adequately sized check valve matched to the solids
handling capability of the pump to prevent fluid backflow.
Backflow can allow the pump to "turbine" backwards and
may cause premature seal and/or bearing wear. If the pump
is turning backwards when it is called on to start the in-
creased torque may cause damage to the pump motor and/
or motor shaft and some single-phase pumps may actually
run backwards.
Install an adequately sized gate valve AFTER the check valve
for pump, plumbing and check valve maintenance.
Important – Before pump installation. Drill a
relief hole in the discharge pipe. It should be located within
the wetwell, 2" (51mm) above the pump discharge but be-
low the check valve. The relief hole allows any air to escape
from the casing. Allowing liquid into the casing will insure
that the pump can start when the liquid level rises. Unless a
relief hole is provided, a bottom intake pump could "air lock"
and will not pump water even though the impeller turns.
All piping must be adequately supported, so as not to impart
any piping strain or loads on the pump.
The pit access cover must be of sufficient size to allow for
inspection, maintenance and crane or hoist service.

PUMP CONTROL PANELS AND WIRING

Mandatory Control Panel Features: Due
DANGER
to the Hazardous environment and the Class
1 Listing on the equipment, the pumps and float switches
require special circuitry in the control panel for safe, reliable
operation and to comply with code. The following panel op-
tions are required to insure the warranty and Agency Listing
are maintained.
Intrinsically Safe Relays: Class 1 explosion
DANGER
proof pumps are normally used in areas
where there is a danger created due to potentially explosive
gases or fluids. It is important that all electrical devices in the
Class 1 wetwell are safe in that environment. If using float
switches you must use "intrinsically safe relays" to power
the control float switches. These relays operate on very low
voltage and amperage to eliminate the danger of a spark
in the wetwell in the event a power cord becomes dam-
aged or severed. Intrinsically Safe Relays are available as a
panel option from most panel suppliers. The intrinsically safe
sensor wiring must be separated from other input wiring in
separate conduits or raceways. Other level control systems
are available on the market and may be applicable for this
type environment, consult with your control manufacturer for
specific data.
WARNING
Moisture Detection System: The pumps
require a moisture detection circuit, also referred to as a "Seal
Fail Circuit", built into the control panel for proper operation
and to maintain the Class 1 Listing. The circuit in the control
panel connects to the motor's moisture sensing probes,
control leads W1 and W2, and signals a failure of the outer
seal. Compatible CentriPro™, ITT Industries Inc. controls are
available through your authorized pump distributor and
from Charles Warrick Co. in Royal Oak, MI. Failure to provide
a seal failure circuit for the moisture sensing probes will void
the warranty and the agency listing. See "Moisture Detection
System" in the Motor Manual included with the pump.
4
WARNING
mal Protection System" which must be connected in series
with the holding coil of the magnetic starter in the control
panel. Control leads P1and P2 are used for this connection.
Failure to properly connect or utilize this system voids the
motor warranty and the agency listing. See "Thermal Protec-
tion System" in the Motor Manual included with the pump.
WARNING
phase controls. The overload protection is to protect against
over current as opposed to the over temperature protection
provided by the Thermal Protection Circuit. The overload
protection may be accomplished by using Class 10 adjust-
able solid state overloads, as used on the Furnas Class 14,
⁄ " (4.8mm)
3
1 6
ESP100 starter or bimetal ambient compensated "heater"
overloads.

WIRING AND GROUNDING

Important notice: Read Safety Instructions before proceeding
with any wiring.
Use only stranded copper wire to pump/motor and
ground. The ground wire must be at least as large as
the power supply wires. Wires should be color coded
for ease of maintenance and troubleshooting.
Install wire and ground according to the National Elec-
trical Code (NEC), or the Canadian Electrical Code, as
well as all local, state and provincial codes.
Install an all leg disconnect switch where required by
code.
Disconnect and lockout electrical power before per-
forming any service or installation.
The electrical supply voltage and phase must match
all equipment requirements. Incorrect voltage or
phase can cause fire, motor and control damage,
and voids the warranty. See motor nameplate for all
electric ratings.
All splices must be waterproof. If using splice kits fol-
low manufacturer's instructions.
and location. The junction box must insure dry, safe
wiring connections.
WARNING
Hazardous
voltage
SELECTING AND WIRING
PUMP CONTROL PANELS AND SWITCHES
MATCH EQUIPMENT TO POWER SUPPLY:
Important: Always match the pump nameplate Amps, Volt-
age, Phase and HP ratings to your control panel and power
supply. Any problem or questions pertaining to another
brand control must be referred to that control supplier or
manufacturer. Our technical people have no technical sche-
matics or trouble shooting information for other companies'
controls.
Thermal (High Temperature) Protection
System: The pumps contain a built-in "Ther-
Overload (Over Current) Protection: Class
10, quick-trip, overload protection must be
provided in both three phase and single
Select the correct type and NEMA
WARNING
grade junction box for the application
Seal all controls from gases present which
WARNING
may damage electrical components.
FAILURE TO PERMANENTLY GROUND
THE PUMP, MOTOR AND CONTROLS
BEFORE CONNECTING TO POWER CAN
CAUSE SHOCK, BURNS OR DEATH.