Resetting The Power Board; Cooling Unit Monitoring Control Operation; No Co" Fault Code; Cooling Unit Vertical Baffle - Norcold N109X Series Service Manual

Cooling unit Monitoring Control Operation

The Cooling Unit Monitoring Control operates in the
following sequence:
1. Because the fin temperature is above 50° F when
the refrigerator is turned ON, sampling begins
when the refrigerator is turned ON and stops when
the temperature falls below 50° F.
2. The Control activates when the fin temperature
rises above 50° F while the refrigerator controls
are demanding cooling.
3. The Control samples the fin temperature every ten
minutes for a period of two hours. If the fresh food
compartment door is opened, sampling stops. It
resumes 10 minutes after the door is closed.
4. If there is no decrease in temperature in this two-
hour time period, the Control turns off the active
refrigeration heat source for 10 minutes.
5. After 10 minutes, the Control restarts the heat
source and begin to monitors the fin temperature
every 10 minutes for 40 minutes.
6. Within this 40-minute period the temperature must
decrease or the Control lock out the heat sources,
display the "no" "co" fault, and sound the alarm.
first "no co" fault Occurrence
The first time the "no co" fault code appears on the
optical control assembly, it can be cleared by the user
by turning the refrigerator OFF and then back ON. This
gives the user the opportunity to check for problems that
may have caused a "no co" code, such as obstructed
ventilation. This fault code occurrence is then stored in
the controls. If the refrigerator completes a full cooling
cycle after the user turns it back on, this fault code
occurrence will be cleared from the controls.
NOtE
"No co" fault code occurrences are not stored in
the built-in diagnostic stored fault history accessible
through the Diagnostic Mode. Instead they are
stored in a separate, unaccessible stored fault
history.
Second "no co" fault Ocurrence
If the refrigerator does not complete a full cooling cycle
after the user turns the refrigerator back on and the "no"
"co" fault displays, the control lock the heat sources
and a "hardwire" power board reset is required. The
hardwire reset of the power board must be performed by
a service center according to the procedure on page 16.
32
N109X Models
Vertical Baffle
The vertical baffle (see Figure 30) extends from the top
of the flue tube to the condenser. The purpose of this
baffle is to direct flue exhaust away from the condenser.
Do not remove the baffle.
Figure 30. Vertical baffle

Refrigerant Leakage

Do not operate the refrigerator if the cooling unit is
leaking or leakage is suspected.
Yellow powder or liquid deposits at the rear of the
refrigerator or ammonia smell inside the refrigerator
indicate refrigerant leakage. Exercise extreme care
when handling a leaking or a suspected leaking cooling
unit. The cooling system refrigerant solution consists
of water, ammonia, sodium hydroxide, and sodium
chromate.

Disposal of Cooling unit

Do not, under any circumstances, release any
waste or residue directly into sewers or surface
waters. If any liquid leaks or spills from the cooling
unit, contact the nearest environmental services for
guidance.
Dispose of cooling unit according to local, state, and
federal guidelines and regulations. Dispose of any liquid
waste or residue according to pre-emergency planning
and all applicable local, state, and federal regulations.
WARNING
WARNING
Refrigerator Service Manual