113
RTAA-IOM-3
Table 18
Diagnostics and Troubleshooting Chart (Continued)
DIAG. ACTIVE
CODE DIAGNOSTIC DESCRIPTION TYPE MODES CAUSE
190 Low Superheat Circuit 1 CMR All Running Modes a. A low superheat condition existed
for an extended period of time. If a
superheat less than or equal to 2 F is
detected for more than 2400 F
seconds, the circuit shall be shut
down. The integrated area (2400 F
seconds) shall be only below 2 F
superheat.
191 Low Superheat - Circuit 2 CMR All Running Modes Same as diagnostic 190.
194 Low Evap. Rfgt. Temp. - Circuit 1 CMR Compressor Energized a. The Saturated Evaporator Refrigerant
Temp.- Circuit 1 dropped below the
Low Refrigerant Temp. Cutout Setpoint
when the circuit was running for
30 F seconds.
b. See the low ambient ignore time on
start-up.
195 Low Evap. Rfgt. Temp. CMR Compressor Energized Same as diagnostic 194, but for Ckt 2.
198 Low Oil Flow - Compressor A CMR Compressor Energized a. The differential oil pressure switch
remained open for more than
20 contiguous seconds on
Compressor A.
199 Low Oil Flow - Compressor B CMR Compressor Energized Same as diagnostic 198, but for Cprsr B.
19A Low Oil Flow - Compressor C CMR Compressor Energized Same as diagnostic 198, but for Cprsr C.
19b Low Oil Flow - Compressor D CMR Compressor Energized Same as diagnostic 198, but for Cprsr D.
19C Phase Loss Compressor A CMR Compressor Energized a. No current was sensed on one or more
of the current transformer inputs. (Must
hold = 20% RLA. Must trip = 5% RLA.)
Time to trip shall be I second minimum
and 3 seconds maximum.
19d Phase Loss Compressor B CMR Same as 19C Same as diagnostics 19C
19E Phase Loss Compressor C CMR Same as 19C Same as diagnostics 19C
19F Phase Loss Compressor D CMR Same as 19C Same as diagnostics 19C
1A0 Power Loss Compressor A CAR All Running Modes a. The compressor was running and all
three phases of current were lost.
b. There was an open Transition input
after transition had been previously
proven to have been complete.
c. There was an incomplete Transition on
the first check after transition and all
three phases of current here not
present.
1A1 Power Loss - Compressor B CAR Same as 1A0 Same as diagnostic 1A0.
1A2 Power Loss - Compressor C CAR Same as 1A0 Same as diagnostic 1A0.
1A3 Power Loss - Compressor D CAR Same as 1A0 Same as diagnostic 1A0.
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