Xylem IM196 R01 Explosion Proof Wastewater Pumps Listed Class 1, Groups C and D Hazardous Locations User Manual

Page 4

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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 increased

torque may cause damage to the pump motor and/or motor

shaft and some single-phase pumps may actually run back-

wards.
Install an adequately sized gate valve AFTER the check valve

for pump, plumbing and check valve maintenance.
Important – Before pump installation. Drill a

⁄

” (4.8mm)

relief hole in the discharge pipe. It should be located within

the wetwell, 2” (51mm) above the pump discharge but below

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 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

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 damaged 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.

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 fail-

ure 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 sens-

ing probes will void the warranty and the agency listing. See

“Moisture Detection System” in the Motor Manual included

with the pump.

Thermal (High Temperature) Protection Sys-

tem: The pumps contain a built-in “Thermal

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 Protection

System” in the Motor Manual included with the pump.

Overload (Over Current) Protection: Class

10, quick-trip, overload protection must

be provided in both three phase and single 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 adjustable solid state

overloads, as used on the Furnas Class 14, ESP100 starter or

bimetal ambient compensated “heater” overloads.

WIRING AND GROUNDING

Important notice: Read Safety Instructions before pro-

ceeding 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 follow

manufacturer’s instructions.

Select the correct type and NEMA

grade junction box for the application

and location. The junction box must insure dry, safe

wiring connections.

Seal all controls from gases present which

may damage electrical components.

FAILURE TO PERMANENTLY

GROUND THE PUMP, MOTOR AND

CONTROLS BEFORE CONNECTING

TO POWER CAN CAUSE SHOCK,

BURNS OR DEATH.

SELECTING AND WIRING

PUMP CONTROL PANELS AND SWITCHES

MATCH EQUIPMENT TO POWER SUPPLY:

Important: Always match the pump nameplate Amps,

Voltage, 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 schematics or trouble shooting information for

other companies' controls.

SELECTING AND WIRING

PUMP CONTROL PANELS AND SWITCHES

WARNING

Hazardous

voltage

PIPING

WIRING AND GROUNDING

WARNING

PUMP CONTROL PANELS AND WIRING

DANGER

WARNING

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