On 8/9/2012 10:38 AM, John F. F. wrote:


"Smarty" wrote in message ...

On 8/8/2012 8:19 PM, Meanie wrote:
"John F. wrote in message
...

The low voltage control lines run from the transfer switch indoors to
the generator outdoors. Once the outdoor unit is removed, there is no
relay switching current source to energize the transfer switch, and thus
the switch will never try to transfer.

The low voltage is produced at the generator, runs through the conduit
to the indoor transfer switch (where it is fused on both sides) and is
then applied to the transfer switch solenoid when the generator has
reached stable output after a brief warm-up. Obviously none of this can
or will happen once the outside generator is detached.



Thanks. The low voltage aspect is very informative. I assume it is
correct to conclude that the circuits that were moved into the
transfer switch from the main panel when the system was originally
installed will continue to function normally as long as the breaker
feeding the transfer switch remains ON and as long as utility company
power is present ? Thanks

Glad to help John. Many people have helped me here with problems and
issues I have needed help with.

First, to clarify, "the breaker feeding the transfer switch" you refer
to is actually the breaker which provides utility power to the
generator. If it is turned off, the generator will start up, just as if
a utility power outage has occurred.

The "special" circuits which were moved to the transfer switch enclosure
will only get their power switched when the low voltage control signal
to the generator is received, and this only happens when the utility
power to the generator (via the aforementioned breaker) is interrupted.
These circuits are then switched to the generator bus by the transfer
switch. They otherwise are connected to the utility bus, the other set
of contacts / poles on the transfer switch.

Therefore, if the generator were to be entirely removed, the special
circuits will always stay connected to utility power and function as
they did before the installation of the generator.

This is a very nice design (speaking as an electrical engineer and
electronics hardware designer !!) and works just as you would want it to.

Hope this answers your question.

Smarty

BTW, the generator schematics and all service info is on the Generac
website should you wish to get the full details downloaded in pdf format.