Equipment Description
The transfer switch is designed to transfer selected loads found
in normal residential installations to standby power in the event
of a primary power outage. The load is connected either to utility
power (normal) or home standby power (generator). The transfer
switch monitors utility and generator voltages and will automatically
connect loads to the appropriate source of power.
The Symphony™ II Power Management System is highly flexible
and utilizes individual high and low voltage modules that can be
mounted anywhere between the home's main distribution panel and
the managed appliance. Designed to communicate via your home's
existing power wiring, the power demand and priority sequence of
up to 8 appliance loads are relayed back to the standby generator,
effectively preventing generator overload while expanding power
range and performance. The system is scalable and additional
relays can be added as a homeowner's power management needs
change over time.
Only a licensed electrician should complete a home standby
installation. Service conduit and conductors can be wired directly
from the watt-hour meter to the transfer switch. A separate service
entrance disconnect and associated wiring is not required when
installed per applicable federal, state and local codes, standards
and regulations.
Major components of the transfer switch are a 2 pole utility
disconnect circuit breaker, a 2 pole generator disconnect circuit
breaker, a 2 pole double throw transfer switch, transfer switch
control circuit board, Symphony II power management system
control circuit board, fused utility terminals and interconnecting
wiring. All of these components are housed in a NEMA 3R
enclosure that is suitable for both indoor and outdoor installations.
The transfer switch is solenoid-operated from utility or generator
inputs and contain suitable mechanical and electrical interlock
switches to eliminate the possibility of connecting the utility service
to the generator output. It has ratings capable of switching full
utility power into the residence. In addition, a manual override lever
is provided for the transfer function.
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The transfer switch control board has active circuits sensing utility
and generator voltages. It creates a signal for generator start-up,
switch transfer and retransfer when utility is restored. The transfer
switch control board provides status LED's to indicate the power
source available.
The Symphony™ II power management system control board
contains a test button, a status LED and eight priority load LED's. It
creates and sends signals to optional remote modules, instructing
them when to add (turn power on) or shed (turn power off) the
managed load.
The Symphony II system power line carrier technology has been
rigorously tested and has proven to be very robust. However,
certain types of devices and appliances in the home generate
'noise' on the power line. Such devices may include non-residential
fluorescent ballasts, dimmers, speed controls (lighting and fans),
bathroom equipment, kitchen equipment, power tools, phone
chargers, and power supplies. These types of devices have the
greatest impact on power line communication when located close
to a remote module.
AM broadcast radio, X10, power line carrier (PLC), uninterrupted
power supply (UPS), transient voltage surge suppression (TVSS)
systems, and power filter technology may also cause the Symphony
II system to not operate as intended. They may cause interference
with the Symphony II system during standby power operation.
If it is determined that power line noise is causing a communication
issue with the Symphony II system, the following changes may
remedy the issue.
• Have commercial (non consumer use) fluorescent ballasts
replaced with residential use ballasts.
• Have a EMI/RFI filter installed in series and near the
problematic device.
• Have the remote module rewired to the opposite power line
(Line 1 or Line 2) from that of the problematic device.
• Refer to Troubleshooting section.
The optional 50 Amp remote module is designed for control by
the Symphony II system to add or shed appliance loads connected
to it based on a user-defined priority setting. This remote module
manages 120VAC or 240VAC, single or double pole loads up to
50 amperes. The remote module's relay state is normally open. Its
components are housed in a NEMA 4 enclosure suitable for indoor
and outdoor installations.
The optional low voltage remote module is designed for control
by the Symphony II system to add or shed an air conditioner, heat
pump, or low voltage contactor controlled loads based on a user-
defined priority setting. The remote module is housed in a NEMA 4
enclosure suitable for indoor and outdoor installations.
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