Winco PSS15B2W-18/A - Manual (Page 9)

PAGE 7 4190-10 60706-170
The Automatic Transfer Switch connects the load (lights,
furnace, outlets, etc.) to the normal power line during
standby. When normal power fails, the A.T.S. starts the
engine generator set, disconnects the power line and then
connects the load to the standby generator set. When
normal power is restored, the automatic switch retransfers
the electrical load to the normal service and stops the
engine. The A.T.S. panel should be mounted as close to
the distribution panel as possible.
*************
***** WARNING *****
*************
All wiring must be done by a licensed electrician, and
must conform to the national electrical code and comply
with all state and local codes and regulations. Check with
your electrical inspectors before proceeding!
************
***** DANGER *****
*************
Be certain the operation selector switch on the front of the
A.T.S. Control is in the “stop” position and the main power
switch “off”. For your own protection, verify these impor-
tant safety precautions yourself with reliable instruments
before proceeding.
A.C. ELECTRICAL CONNECTIONS
*************
***** WARNING *****
*************
A FUSED DISCONNECT OR CIRCUIT BREAKER
MUST BE INSTALLED BETWEEN THE GENERATOR
AND THE A.T.S. PANEL TO PREVENT OVERLOADING
AND BURNING OUT THE GENERATOR. FAILURE TO
PROVIDE A FUSED DISCONNECT OR CIRCUIT
BREAKER, RATED AT GENERATOR RATING WILL
VOID YOUR WARRANTY IN CASE OF GENERATOR
FAILURE.
Generator Connections
To gain access to the customer connections, remove the
end panel opposite the hot air discharge end. All connec-
tions including AC & DC connections to the ATS, 120 Volt
power connection for battery charger, and battery installa-
tion are made behind this panel. After removing the end
panel you will need to remove the cover over the connec-
tion box in the upper right hand corner. Knockouts are
provided on the outside of the enclosure for your conve-
nience. See page 15 for unit layout.
Five AC power leads are required between the genera-
tor and the A.T.S. Three hot leads are connected genera-
tor leads G1, G2 and G3, a neutral lead connected to
generator lead N. A ground wire is also required, which is
connected to the ground lug mounting bolt. These units
are shipped with no neutral to ground bond. You will
need to run both the neutral and ground leads in addition
to the three power leads all the way back to your distribu-
tion panel. Your distribution panel should contain your
only neutral to ground bond.
All power leads from the generator to the A.T.S. must be
sized to handle rated generator output amperage at a
minimum, the type of wire you use will determine the
gauge required. Consult your local wire supplier for proper
gauge and type for your installation.
In addition to the power leads you will also need to run a
three wire 120 volt, 15 amp GFCI protected circuit from
your distribution panel to the generator. This circuit will be
used to power the battery charger.
The last two wires you will need are the DC control
leads for the start circuit in the A.T.S. These last two
connections will be discussed later in more detail.
AUTOMATIC TRANSFERS SWITCH
CONNECTIONS
See the manual shipped with the Automatic Transfer
switch for connection locations in the switch. Connections
in each switch will vary depending on the type of switch
and the manufacturer.
INSTALLATION NOTES
The load current carrying wires 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 conduit.
(Knockouts are provided in the control box)
Because of the many different types of service, feeder,
and distribution equipment, no specific wiring instructions
can be provided. It is, however, recommended that only
copper wire be used. In all cases it is essential that while
the load is connected to the generator, 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 A.T.S. 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
A.T.S. panel as the A.T.S is not service entrance 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 existing
wiring, first determine which circuits will be on the
emergency load circuit. If the entire load is to be trans-
ferred, the transfer switch can be wired in directly after the
watt-hour meter and the service entrance, providing the
service entrance ampere rating is within the transfer
switch’s rated capability.