N640-Im, N641-Im, N840, N841,N840-Im,And N841-Im) - Norcold N620 Service Manual

Operating the Refrigerator Controls
(models N640, N641, N640-IM, N641-IM,
N840, N841, N840-IM, and N841-IM)
Control panel:
The refrigerator control panel (See Art01018) 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, push the ON / OFF button
to start the refrigerator in auto mode.
- If the refrigerator is operating, push and hold the ON /
OFF button for two seconds to shut down the refrigerator.
The TEMP SET button [3] controls the temperature adjust-
ment of the freezer and the fresh food compartment. The
temperature adjustment that you select does not change if
the operation mode of the refrigerator changes.
- Push the TEMP SET button and the temperature setting
"1-9" appears in the center display [4].
- Push and hold the TEMP SET button and the temperature
setting changes.
- The number "9" is the coldest temperature setting.
The MODE button [2] controls the operation mode of the
refrigerator:
- Push and hold the MODE button and each of the four
operating modes of the refrigerator flash one at a time in
the center display.
- There is one automatic mode of operation and there
are three manual modes of operation.
- When the mode of operation that you wish shows in
the center display, release the MODE button.
Service Manual 8
Automatic mode operation:
When you select AUTO mode, the refrigerator controls
automatically select the most efficient energy source that is
available for operation. If a more efficient energy source
becomes available, the refrigerator controls change from the
current energy source to the more efficient energy source.
The controls select the energy source in this sequence:
- When 120 volts AC is available to the refrigerator:
- "AU" "AC" flashes in the center display.
- This means that the refrigerator is operating on AC
electric.
- After ten seconds, the "AU" "AC" goes off and only a
power indicator remains.
- If 120 volts AC is not available to the refrigerator:
- "AU" "LP" flashes in the center display.
- This means that the refrigerator is operating on
propane gas.
- On 3-Way models only, if neither 120 volts AC nor
propane gas is available to the refrigerator:
- "AU" "dc" flashes in the center display.
- This means that the refrigerator is operating on DC
electric.
NOTE: DC electric operation is less efficient than AC
electric and propane gas. Use DC electric
operation only to maintain the refrigerator
temperature while in transit and if the other
energy sources are not available. Do not use
DC electric to initially decrease the tempera-
ture of the refrigerator.
If an energy source is available to the refrigerator, but is not
operating correctly:
- A fault code shows in the center display.
- The refrigerator controls try to change to a less efficient
energy source.
- If a less efficient energy source is not available:
- An audible alarm starts.
- The refrigerator stops operation.
- Refer to the "Fault Codes" section of this manual.