6 | EN
Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
3473000C
Thermostats
XLE-Series pumps are protected from overheating by thermal
switches (thermostats) located in the motor. For 1-phase models,
a hermetically sealed thermostat is mounted on the motor
windings and wired directly in series with the motor’s winding,
interrupting power in a high heat condition. 3-phase models
utilize two thermostats mounted in series directly on the motor
windings, thus monitoring the pump’s internal temperatures. The
thermostat circuit must be connected in such a way as to open the
motor contactors in the panel cutting power to the pump in an
overheat condition.
Both 1-phase and 3-phase pumps are designed to operate under
class B insulation with a maximum temperature of 266°F (130°C)
internal temperatures, even though the motors are constructed
with class F materials.
Failure to use the proper circuitry and
connection of the thermostat will drop T class to T3 on 3-phase
models.
Many control panels have a manual reset button for the
thermostats on 3-phase models. This button must be pressed to
reset the system after the pump has cooled. 1-phase models
automatically reset after the pump has cooled to a safe
temperature.
Power and Control Cords
Do not remove cord and strain relief, and do not connect
conduit to pump.
The power and control cords cannot be spliced; a junction box
may be used providing it is rated for hazardous locations and has
approved cord connectors.
IMPORTANT:
Each cable has a green lead. This is the ground wire
and must be grounded properly per NEC
®
and/or local codes.
Wiring Instructions
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code
®
, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
Figure 1. Wiring Diagram 1-Phase
RISK OF ELECTRIC SHOCK
RISK OF ELECTRIC SHOCK
WHITE
WHITE
GREEN
BLACK
GREEN
GREEN
BLACK
GREEN
NOT
USED
*
NOT
USED
*
SEAL
LEAK
BLACK
WHITE
RED
MOTOR
BLACK
WHITE
RED
RED
WHITE
GREEN
BLACK
L2/N
L1
RUN
CAP
POTTING
RESIN
SEAL
FAILURE
PROBES
CONTROL
CORD
POWER
CORD
* Note:
On
1-phase
pumps, the
white and
red leads
of the
control
cord are
not used.
