5–7
T-354
Probe Diagnostic Logic - Standard
If the probe check option (controller configuration code CnF31) is configured for standard, the criteria used
for comparison between the primary and secondary
control
probes is:
1
C (1.8
F) for perishable set points or 2
C (3.6
F) for frozen set points.
If 25 or more of 30 readings taken within a 30-minute period are outside of the limit, then a defrost is initi-
ated and a probe check is performed.
In this configuration, a probe check will be run as a part of every normal (time initiated) defrost.
Probe Diagnostic Logic - Special
If the probe check option is configured for special, the above criteria are applicable. A defrost with probe
check will be initiated if 25 of 30 readings or 10 consecutive readings are outside of the limits
In this configuration, a probe check will not be run as a part of a normal defrost, but only as a part of a
defrost initiated due to a diagnostic reading outside of the limits.
30-Minute Timer
The 30-minute timer will be reset at each of the fol lowing conditions:
• At every power up
• At the end of every defrost
• After every diagnostic check that does not fall out side of the limits as outlined above.
Probe Check:
A defrost cycle probe check is accomplished by energizing just the evaporator motors for eight minutes at
the end of the normal defrost. At the end of the eight minute period, the probes will be compared to a set of
predetermined limits. The defrost indicator will remain on throughout this period.
Any probe(s) determined to be outside the limits will cause the appropriate alarm code(s) to be displayed
to identify the probe(s) that needs to be replaced. The P5 Pre-Trip test must be run to inactivate alarms.
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