Electrical Components; Operating The Refrigerator Controls (Models N620, N621, N820, And N821); Operating The Refrigerator Controls - Norcold N620 Service Manual

Electrical Components

This refrigerator operates on these electrical sources.
AC Operation 120 volts AC voltage
12 volts DC control voltage
DC Operation 12 volts DC voltage
(3-way models)
Operation out of these limits may damage the refrigerator's
electrical circuit parts and will void the warranty.
Examine the 120 volts AC supply:
WARNING:
Connect the AC power cord only to a
grounded three-prong receptacle. Do not remove the
round ground prong from the power cord. Do not use a
two-prong adapter or an extension cord. Operation of
the refrigerator without a correct ground could cause
dangerous electrical shock or death if you are touching
the metal parts of the refrigerator or the vehicle.
- Make sure the AC power cord is in a grounded three-
prong receptacle.
- Make sure the receptacle is within easy reach of the lower
intake vent.
- Make sure the power cord does not touch the burner
cover, the flue pipe, or any hot component that could
damage the insulation of the power cord.
Examine the 12 volt DC supply:
The refrigerator gets power from the 12 volt system of the
vehicle; either from the battery or from an auxiliary (house)
battery. The battery system not only supplies DC power to the
refrigerator, but also to other components of the vehicle.
The DC heating element, which supplies power for cooling
during DC operation, has a high current draw and can cause
rapid battery drain.
Make sure the wire size and fuse size are correct:
- On 2-way models, use a minimum of 18 AWG wire and a
maximum 6 Amp fuse.
- On 3-way models, measure the distance from the vehicle
battery to the refrigerator.
- If the distance is 0 - 20 feet, use a minimum of 10
AWG wire and a 30 Amp fuse.
- If the distance is over 20 feet, use a minimum of 8
AWG wire and a maximum 40 Amp fuse.
- If the wire size is larger than the min. size, use the correct
fuse per RVIA A119.2 standard or local codes.
Service Manual 6
(108 volts min. - 132 volts max.)
(10.5 volts min. - 15.4 volts max.)
(10.5 volts min. - 15.4 volts max.)
- Make sure the positive DC wire from the battery is
connected to the power board terminal that is marked
12VDC.
- Make sure the DC ground wire from the battery is
connected to the power board terminal that is marked
12V GND1.
- Make sure each DC power supply wire is on the correct
polarity terminal.
- Make sure an in-line fuse is installed on the DC positive
wire, as near the battery as possible, between the battery
and the terminal block of the refrigerator.
NOTE: This in-line fuse is necessary for added safety, even
though the refrigerator has a DC fuse in the control
assembly.

Operating the Refrigerator Controls

(models N620, N621, N820, and N821)
Control panel:
The refrigerator control panel (see Art01019) is between the
freezer compartment and the fresh food compartment. To
maintain the operating control functions of the refrigerator, a
12 volt DC power supply is necessary. The refrigerator and
any other DC components in the vehicle, receive DC power
from the 12 volt system of the vehicle; either an auxiliary
battery, a converter, or the vehicle engine battery.
The ON / OFF button [1] starts and shuts down the refrigera-
tor:
- If the refrigerator is shut down, press the ON / OFF button
to start the refrigerator in auto mode.
- If the refrigerator is operating, press and hold the ON /
OFF button for two seconds to shut down the refrigerator.
The TEMP SET button [2] controls the temperature adjust-
ment of the freezer and the fresh food compartment. The
temperature adjustment that you select does not change if
the mode of operation of the refrigerator changes.
- Push the TEMP SET button and the temperature setting
"1-9" appears in the center display [3].
- Push and hold the TEMP SET button and the temperature
setting changes.
- The number "9" is the coldest temperature setting.