Xylem IM039 R04 Grinder Pumps 10 and 30 1_1/4 Discharge - Manual (Page 5)

5
FLOAT SWITCH TYPES
There are two basic float switch designs; single-action and
wide-angle. Single-action switches operate over a range of 15º
so they open and close quickly. Wide-angle floats operate over
a 90º swing with the tether length between the float body and
the pivot point controlling the On-Off range. The design de-
termines how many floats are required with different systems
or controls.
Floats may be normally open (NO) for pump down applica-
tions or to empty a tank. Normally closed (NC) switches are
used to pump up or to fill a tank.
A control switch may be used only with a control panel, never
direct connected to a pump.
SETTING THE FLOAT SWITCHES
There are no absolute rules for where to set the float switches,
it varies from job to job.
Suggested Rules to Follow:
All floats should be set below the Inlet pipe!
Off Float: Best: set so the water level is always above the top
of the pump (motor dome). Next Best: set so the water level is
not more than 6" below the top of the pump.
On Float: set so the volume of water between the On and Off
floats allows two (2) HP and larger pumps to run a minimum
of 2 minutes. Basin literature states the gallons of storage per
inch of basin height.
Lag/Alarm Float(s): should be staggered above the Off and
On floats. Try to use most of the available storage provided
by the basin, save some space for reserve storage capacity. See
Diagrams and Charts in Float Switch Chart Section.
PANEL WIRING DIAGRAMS
Our control panels are shipped with instructions and wir-
ing diagrams. Use those instructions in conjunction with this
IOM. Electrical installation should be performed only by
qualified technicians. Any problem or questions pertaining to
another brand control must be referred to that control sup-
plier or manufacturer. Our technical people have no technical
schematics or trouble shooting information for other compa-
nies' controls.
ALARMS
We recommend the installation of an alarm on all Wastewa-
ter pump installations. Many standard control panels come
equipped with alarm circuits. If a control panel is not used,
a stand alone high liquid level alarm is available. The alarm
alerts the owner of a high liquid level in the system so they can
contact the appropriate service personnel to investigate the
situation.
Three Phase Control Panels
Series 1GD and 12GDS three phase grinder pumps require a
control panel containing as a minimum:
• A 3 pole circuit breaker.
• Magnetic starter with ambient compensated Class 10
overloads.
• Transformer to supply 115 or 24 volt control power.
• Terminal wiring strip for all external connections.
RECOMMENDED CONTROL PANEL AND
PUMP OPTIONS
• A panel seal failure circuit with relay and warning device can
only be used if pump is equipped with a seal failure sensor.
• High level alarm circuit
• Visual and/or audible high level alarm device.
Our Simplex and Duplex “Single Phase Grinder Panels” (see
the price book) contain built-in capacitors, a start relay and
wiring terminals.
In the event you wish to source a control panel locally we sell
capacitor kits which a panel shop will be able to build into a
custom panel. Note: the kits contain the capacitors and start
relay. These are not a field installable, add-on item. Building
the capacitor kits into a control panel is a job for a UL or CSA
approved panel shop. Due to concern for liability, installer
safety and Agency Listing, our Customer Service technicians
are forbidden to assist anyone attempting to field modify a
standard control panel using these capacitor kits. We hope you
understand and respect our position in this matter. “Recom-
mended Control Panels” are listed in the Product Bulletins
found in the respective product catalog or on the website
named on the front cover of this IOM.
Motor High Temperature Sensor:
The single phase 1GD or 12GDS pumps have an optional
feature, a built-in motor high temperature sensor. This heat
sensor opens and closes the circuit to the contactor coil when
properly wired into a control panel. It opens at a motor tem-
perature of 275°F (135°C) and stops the pump. As the motor
temperature drops to 112°F (78°C) the motor automatically
restarts.
Pump Seal Failure (Moisture Detection) Sensor:
An option on the 1GD and standard on the 12GDS. This
sensor located in the seal chamber detects the presence of
moisture in the seal chamber. When connected to an optional
seal failure relay and warning device in the control panel it
signals that service needs to be performed on the lower seal.
The seal failure circuit option must be ordered as a control
panel option, it is not supplied as a standard item.