Norcold 121X series, Руководство по обслуживанию

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S
ection
8
63
If fin temperature remains above 50 degrees
Fahrenheit (10 degrees Celsius), the cooling
system monitoring records the fault in non
volatile memory. Figure 8-2 illustrates the
fault segment that appears in diagnostic mode
screen 5. See Section 9 for Diagnostics
information.
Cooling system monitoring is inactive when
fin temperature is 50 degrees Fahrenheit (10
degrees Celsius) or lower. It does not activate
when:

Fin temperature is below 50 degrees
Fahrenheit (10 degrees Celsius)

The thermistor is disconnected from the
circuit, is open (no resistance), or is shorted.

Either one or both of the fresh food
compartment doors is sensed open.
Sampling resumes 10 minutes after the door
is closed.

Both AC heaters failed open.

AC voltage is lower than 108 volts AC.

Fin frost management active.
7 -No cooling sensed
1 COLD-
9 COLDEST
ON/OFF MODE TEMP SET
on
1 COLD-
9 COLDEST
Figure 8-2. —Diagnostic screen 5, segment 7, no cooling sensed.
The cooling system monitoring control
monitors the cooling performance through the
thermistor.
Monitoring is active when fin temperature
(second fin from right on fin assembly) is
higher than 50 degrees Fahrenheit (10 degrees
Celsius) and the controls are call for cooling.
The initial fin temperature monitoring period
is 120 minutes (2 hours) with temperature
samples taken at 10 minute intervals.
If the cooling system monitoring does not
sense a drop in fin temperature (approximately
1 degree Fahrenheit or 0.56 degree Celsius) in
two hours, it powers off the active heat source
for 10 minutes. After the end of the 10 minute
rest period, the system powers on the heat
source for another 40 minutes.
During the 40 minutes monitoring period,
the cooling system monitoring samples fin
temperature every 10 minutes for a drop in fin
temperature.
Cooling System Monitoring