Winco ULPSS20B4W/A - Manual (Page 12)

20-00 2 60706-228
WIRE TEMPERATURE RATING
CU Connector AL Connector
75° C # 2 AWG # 1/0 AWG
90° C # 3 AWG # 2 AWG
To gain access to the customer connections, remove
the end door panel opposite the muffler. All AC and
DC connections to the ATS, 20 Volt power connec-
tion for battery charger, and battery installation are
made behind this panel. See pages 22 and 23 for
generator set and pad layout.
Two (2) hot leads, one () neutral and () ground
lead are required between the generator and the
ATS or distribution panel. The two power leads from
the generator are marked G and G3. Next install
the two leads, one neutral and one ground, from the
generator set to the ATS or distribution panel.
In addition to the power leads, install a three wire
20 volt, 5 amp circuit from your distribution panel
to the generator. This circuit will be used to power
the battery charger, optional block heater and op-
tional battery heater.
The last four wires you will install are the DC control
leads (4 or 6 gauge) for the start circuit in the ATS.
These connections will be discussed later in more
detail.
WINCO UL ATS (ASCO 165)
See the ASCO installation manual for additional
details on proper wiring of the Automatic Trans-
fer Switch.
The standby generator terminals in the ATS are
marked “ALTERNATE L2 & L6”. The “hot” leads
G and G3 from the generator are connected to the
terminals L2 & L6.
The normal line power terminals in the ATS are
marked “PREFERRED - L & L5”. The “hot” line
power leads are L and L3 from your utility power
supply are connected to terminals L and L5.
The load terminals in the ATS are marked “LOAD
- L3 & L7”. The leads to the load distribution panel
are connected to terminals L3 & L7.
The neutral leads from all three locations are con-
nected to the isolated terminal lugs on the sidewall
of the cabinet. This terminal block is labeled “NEU-
TRAL” and the terminal lugs are mounted on red
isolation standoffs.
The ground leads from all locations are connected to
the grounded terminal lugs also located on the side
wall. This set of terminals is labeled “GROUND”.
INSTALLATION NOTES
The load current carrying wires (L) and (T) must be
sized to handle the maximum load current without
excessive voltage drop. By code, the wire must be
heavy enough to handle the full current rating of the
main line circuit breaker (or fuse) in the entrance (or
sub-panel) protecting the contactor switch.
All wires should be installed in rigid or flexible con-
duit. Because of the many different types of service,
feeder, and distribution equipment, no specific wiring
instructions can be provided. It is, however, recom-
mended that copper wire be used. In all cases it is
essential that while the load is connected to the gen-
erator, there can be absolutely no feedback from the
generator to the power line or the power line to the
generator. When properly installed, the normal ATS
control and safety systems will eliminate all paths for
feedback. Check with your local electrical inspector
on applicable local, state and federal codes.
******************
***** WARNING *****
******************
A service disconnect must be installed in front of
the ATS panel, as the ATS is not service enterance
rated. This will allow you to test the generator under
load. Should you ever have to work on the switch,
you will be able to disconnect the power and work on
the switch cold without having the power company
pull your meter.
To wire the automatic transfer switch into the exist-
ing wiring, first determine which circuits will be on
the emergency load circuit. If the entire load is to
be transferred, the transfer switch can be wired in
directly after the watt-hour meter and the service en-
trance, providing the service entrance ampere rating
is within the transfer switch’s rated capability.
If only specific circuits are to be powered under
emergency power failure conditions, an additional
distribution panel designated “emergency distribution
panel” must be installed.
All selected emergency circuits are removed from
main distribution panels and reinstalled in the emer-
gency distribution panel. Suggested circuits: freez-
er, refrigerator, furnace, emergency lights, sump
pump, emergency outlet circuits, etc. Total running
load must not exceed generator rating.