Operation; Display Panel; Service; Status - Airstream Interstate 2020 Owner's Manual

resetting a fault condition still exists and should be
serviced by a qualified Service Technician. If the
breaker stays "ON" but snaps back to "OFF" after
plugging in or turning ON the possibly faulted device a
fault condition may exist in that device and should be
service by a qualified Technician.
The power center Ground Fault Circuit Interrupter
(GFCI) breaker is a special breaker that will provide
additional safety to the occupants of the touring coach
on the following receptacles; external, galley, lavatory,
and entertainment� In addition to short circuit and
overload protection the GFCI will shut off the breaker if
any current feeding out of the breaker does not return
to it� As in the case of a person contacting the electrical
energized part of the GFCI circuit and an electrically
conductive object not associated with the circuit�
Refer to to Ground Fault Circuit Interrupter and GFCI
Breaker Test in this section for more information�

Operation

In operation, when 120 VAC and 12 VDC are initially
applied, the system will energize the relays at one
second intervals, closing the normally open contacts
on each of the five relays while monitoring the total
current� If the total should exceed the service limit, the
system will turn off the last load that was turned on� As
it does this, it calculates the amount of current that was
removed, which is the value for that load� This value
is placed in memory� The system has "learned" the
amount of current that particular appliance draws� This
feature compensates for the difference in current draw
over a range of line voltage and ambient temperature,
by relearning the load each time it is turned off�
The system now waits until the total current is lower
than the service limit, by the amount in memory, before
it will turn that load back on� This ensures that there is
sufficient current to operate the load.
2020 Interstate

Display Panel

The display panel requires little user interaction
and is provided to help the user understand power
management� The display monitors the total AC current
of the touring coach and prevents circuit breaker
tripping by momentarily shedding loads� As additional
appliances are turned on the system will begin to shed
loads� As appliances are turned off, and a minimum of
two minutes has expired, the system will automatically
restore power to each of the shed loads�

Service

The "Select" button allows the service type to be set
to either 30 amp or 20 amp, to match the incoming
service�
When power is first applied, the system will be in the
30-amp mode and the screen will display "Service
30A"� Momentarily pressing the "SELECT" button will
switch the system to the 20-amp mode� Momentarily
pressing the button again will switch the system back
to the 30-amp mode�
Press the "SELECT" button to switch to 20-amp service
if it is necessary to use a 20-amp adaptor or you know
the shoreline power is 20 amp, The screen will display
"Service 20A"�
The generator supplies 20-amp service and is set to
switch the system automatically to the 20-amp mode
whenever the generator is the power source� The
screen will display "Generator 20A" when the generator
is supplying power�
The Display Panel is protected by a 5-amp automotive-
type fuse located under the EMS 120-volt Distribution
Panel cover� Remove four screws from the cover to
access the fuse�

Status

The roof A/C and microwave are set at the factory to be
the controlled circuits and are shed in this order�
This means if a power hungry appliance is plugged
into an outlet and the system begins to use more than
30-amps it will begin to shed loads and will shut off the
A/C�
Interior
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