Built-In
Built-In
(600-
(600-
2
2
)
)
Series
Series
Electronic Control System
3-14
#3758407 - Revision B - August, 2006
Figure 3-17. Signal Trace Schematic of Compressor Electrical System
Figure 3-18. SERVICE & EC Flashing = Several Excessive Compressor Run Periods
Monitor Compressor Run Duration, Displays If Service is Needed (Starting with Serial #2092137)
The microprocessor observes the changing state of the compressor relays to determine the length of compressor
run time (See Figure 3-17). If a compressor runs 100% (Fre = 6 hours / Ref = 4 hours), an error code is logged (EC
40 / EC 50, respectively), and defrost is initiated, but SERVICE will not
flash.
If several 100% run periods occur, and the compartment temperature does not fall to at least the set point / low off-
set temperature average (and the door is not opened during the last run period), then SERVICE will flash along with
the error code (See Figure 3-18).
NOTE: To clear a
flashing SERVICE
and EC, the problem
must be corrected,
then switch the unit
off then back on
and/or press the Bell
ON/OFF key for 15
seconds. Failure to
clear an error code
will cause SERVICE
to display constant
once Diagnostic
Mode is initiated.
NOTE: If the unit is
ever switched OFF
then back ON, the
compressor will not
energize for at least
3 minutes. This 3
minute minimum OFF
time is used to pro-
tect the compressor
and its electricals.
NOTE: Prior to serial
#2092137, SERVICE
will flash if a com-
pressor runs 100%,
but no error codes
will be logged.
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