Model 34850
50A Surge Guard
*
Portable Device with LCD Display
For technical assistance, please call 1-800-780-4324 x 20311
Manufactured by Southwire Company, LLC, 5250 140th Avenue North, Clearwater, Florida 33760
© 2017 Southwire Company, LLC. All rights reserved. * Trademark of Southwire Company, LLC. Registered in the United States.
Surge Guard* RV power protection devices protect your RV from low quality or incorrect shore power.
Normally shore power should be around 115 –120 Volts AC from L1 or L2 to Neutral, or 240V from L1 to L2. When power
falls too far outside this range it represents a poor or hazardous condition to your RV’s electrical system. Surge Guard
RV power protection device provides protection to your RV by turning off power when the line voltages L1 or L2 fall below
102 Volts AC or goes above 132 Volts AC.
These devices also protects your electrical system from a reverse polarity condition which indicates that the hot and
neutral lines of shore power are swapped or reversed. This can be hazardous to equipment and safety. Your device will
not connect power to your RV until the reverse polarity fault is corrected.
In the event your Surge Guard device is not functioning as expected, perform the following troubleshooting steps in order
to determine and correct any malfunctions. Note: Testing should be performed with AC units and electrical appliances
turned off, then verified with appliances turned on.
Connect the shore power cord to a 240V, 50A power source. The LCD screen will display “DELAY” for 128 seconds while
the Surge Guard device is monitoring the incoming power. Note that this guide also applies if using 120V, 30A power
with a suitable adapter.
PROBLEM
TROUBLESHOOTING STEPS
Coach powers up after 128 seconds but then turns off after another
8-10 seconds.
The device may be operating properly, and you may have a low voltage
condition. In this case, turn off as many loads as possible. It is not
safe to operate some equipment with low voltage. Verify that the input
voltage is greater than 102VAC with loads turned on and off.
Coach does not power up after 128 seconds after connecting to shore
power.
Check the LCD display and the Caution When Flashing light (Red LCD).
Check voltage with voltmeter at connection.
LCD shows a fault such as L1 or L2 Low or L1 High and the Caution
When Flashing light is blinking.
There could be an open conductor or unsafe power. Check the input
connections, shore power cord, and adapter (if applicable).
L1 and L2 are within range (102 – 132VAC) and there is no power.
Call Southwire Technical Support at 1-800-780-4324.
LCD screen displays “REVERSE POLARITY” and the Caution When
Flashing light is blinking
Shore power connections are reversed and you have an unsafe
condition. In this case notify your park of the condition in order to
correct the fault.
A fault occurs such as a low or a high voltage during normal operation
when shore power is within good operating range
The device will turn off power to the RV and will display a fault message
on the LCD display. If the power returns to normal, the device will
display “DELAY” on the LCD screen and will wait 128 seconds before
turning power to the RV back on.
506-00018B
1. Low Voltage – If the input voltage drops below 102VAC for more than 8 seconds, the power will be removed protecting your electronics. This
condition may be caused by overloading the park’s power grid. Try reducing your loads. Otherwise, do not operate until power is restored to
safe levels.
2. High Voltage – If the input voltage increases above 132VAC for more than 8 seconds, power will be removed. In Generator mode, check for
load balance. Check the generator’s voltage regulator and adjust to safe operating levels.
3. Line 1, Line 2 or Neutral Open – Check all input wiring to the device. Check the shore power cord and wiring from the generator if applicable.
Check/replace adapter if reducing down to 120V, 20A service. Notify park for shore power problems if applicable.
4. Caution When Flashing Light – If the caution light is on bright, there is high voltage on the ground or neutral wires. If the light is dimly lit, there
is a low voltage on the neutral wire. It is not uncommon for 2 to 3 volts to be on the neutral wire with respect to ground.
TROUBLESHOOTING GUIDE
