Landmark 365 User Manual - page 40
Heartland Owners Forum
http://manuals.heartlandowners.org
Landmark 365 User Guide V1.1.pdf
P a g e
| 40
Version 1.1, March 10, 2016
Built-in Surge Protector
While the surge protector built into the transfer switch guards against certain types of electrical
problems, it doesn’t provide the comprehensive protection of an Electrical Management System (EMS)
such as the Progressive Industries EMS-HW50C device. You should consider adding an EMS to your
coach.
Residential Refrigerator Automatic Transfer Switch
Because the Residential Refrigerator needs dual power sources, an automatic transfer switch is used to
switch between shore power and battery power (via the inverter). Some inverters used in Landmark
365 units have built-in transfer switches. In those cases, there will not be an external transfer switch).
The transfer switch receives power from one of the 120V circuit breakers in the main panel, and also is
plugged into one of the outlets on the inverter located in your front compartment so it can receive
inverter 120V AC power. The transfer switch ensures that only one power source is used at any time,
and that you don’t back feed power into the coach’s power system.
Note: When power is connected or disconnected while there are appliances or other loads running
in the RV, there may be arcing inside the transfer switch contacts. Over a long period of time, it’s
possible that this may cause pitting on the contacts, resulting in electrical issues. To prevent this
arcing, before disconnecting shore power, or before turning the generator off, turn off the main 50
amp circuit breakers in the circuit breaker panel. Turn them on only after shore power has been
connected or the generator has been running for about 30 seconds. Keep in mind that if you have
an EMS device, they usually have a 2 minute delay before power is turned on. You should wait the 2
minutes before turning the circuit breakers back on.
While it’s not essential to do this, it’s a “best practice” that may save you from a repair a few years
down the road.
Also, the campground power pedestal circuit breaker should be turned off before plugging or
unplugging your shore power cable. This will avoid arcing on the prongs and possible damage to the
campground pedestal.