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4190-00 60706-169
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.
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***** 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!
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***** 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
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***** 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 air dischage. All connections
including AC & DC connections to the ATS, 120 Volt
power connection for battery charger, fuel line connection
and battery installation are made behind this panel. After
removing the end panel you will need to remove the cover
over the connection box in the upper right hand corner.
Knockouts are provided on the outside of the enclosure
for your convenience. Three AC power leads are required
between the generator and the A.T.S. Two hot leads
connected generator leads G1 and G3 and a neutral lead
connected to generator leads 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 two power leads all the
way back to your distribution 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 area.
In addition to the power leads you will also need to run a
three wire 120 volt, 15 amp circuit from your distribution
panel to the generator. This circuit will be used to power
the battery charger and the optional block heater and
battery heater
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 wil be discussed later in more detail.
A.T.S .Connections - for standard Non-UL WINCO ATS
The standby generator terminals in the A.T.S are
marked “GENERATOR - G1, G-N, G3”. The “hot” leads
G1 and G3 from the generator are wired to the generator
side contactor, terminals G1 and G3.
The line terminals in the A.T.S. are marked “LINE - L1,
L-N, L3”. The “hot” line leads L1 and L3 are wired to the
line side contactor, terminals L1 and L3.
The load terminals in the A.T.S. are marked “LOAD - T1,
T-N, T3”. The “hot” leads T1 and T3 are wired to the
bottom side of both the line side and the generator side
contactor.
If you are using a separate ground lead it is routed to
the ground lug in the A.T.S.
ASCO UL ATS (165 & 300 Series)
See the ASCO operator manual shipped with the
transfer switch for proper wiring instructions.
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 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.
