Asco 4820, User Manual, Page: 13 / 51

Description
ASCO Model K875A Outdoor Load Bank
2-2
The control panel contains a POWER ON-OFF switch with a CONTROL POWER light, a
BLOWER POWER light, blower power START and STOP pushbutton switches, an AIR FAILURE
light, a Load Bank OVER TEMP light, a MASTER LOAD ON-OFF switch, a VOLTAGE SELECT
switch for Load Banks with dual voltage capability, and individual KW LOAD STEP switches. All
load step switches are the toggle type with metal levers. The control panel also contains a FUSE for
protection of the control circuit.
Also, for Load Banks equipped with the Load Shed option, the control panel will contain an
AUTO/MANUAL selector switch and an AUTO light. Various digital metering packages are
optionally available and are packaged as part of the control panel.
Sized for mounting in a 19-inch rack enclosure, the control panel has a vertical height of 14 inches
and requires a minimum of 8 inches of clearance behind the panel.
A control panel enclosure, for control panels with or without metering, is available as an option. It
can be supplied mounted directly to the Load Bank or loose for mounting in a remote location.
The K875A Load Bank is fabricated using heavy-gauge aluminized sheet steel, making a rigid
structure. Mounted within the structure are the load element resistor assemblies, load contactors,
and the cooling fan(s)/blower(s). The resistive elements are porcupine type, fully supported along
their length. Mounted on separate panels are the motor starter, motor overload relay, fuses, and
customer connection terminals. The cooling air is drawn in from the sides and the back intake
screens, forced across the resistor elements, and exhausted out the top. The panel includes a
temperature controlled heater, which may be used to prevent condensation from hindering operation
of the Load Bank.
The Load Bank is equipped with screens mounted at the inlet openings and exhaust hoods. The Load
Bank uses a welded fabricated base to facilitate handling by a forklift truck. Bolt holes are also
supplied in the base to permit permanent mounting to a concrete pad or metal foundation.
*******************************************************
W A R N I N G
Never exceed the rated voltage as this will cause the Load Bank to
overheat.
Do not apply DC voltages as the contactors do not have arc blowout
magnets.
*******************************************************