115
RTAA-IOM-3
Table 18
Diagnostics and Troubleshooting Chart (Continued)
DIAG. ACTIVE
CODE DIAGNOSTIC DESCRIPTION
TYPE
MODES
CAUSE
1Ad
Memory Error Type I
IFW
UCM Power Up or
a. On UCM power up or following a
Following a Type II
Type II Memory Error a NOVRAM
Memory Error
memory error was detected. The UCM
is operating on all Engineering ROM
defaults for all setup parameters.
Check all I setup parameters and
continue to run chiller. Replace the
Chiller Module as soon as a
replacement is available.
1AE
Low Diff. Pressure - Circuit 1
CMR
Compressor Energized
a. The fan control algorithm detected a
low differential temperature/ pressure
condition that existed for more than
180 contiguous seconds. The trip-
point is 40 PSID.
1AF
Low Diff. Pressure - Circuit 2
CMR
Compressor Energized
Same as diagnostic 1AE.
1b2
Severe Phase Unbalance -
CMR
All Running Modes
a. A 30% Phase Unbalance diagnostic
Compressor A
has been detected. The 15% Phase
Unbalance criteria has been defeated.
Items to check are the Current
Transformer Part Numbers (they
should all match), The Current
Transformer resistances, line voltage
phase balance, all power wiring
connections, the contactor pole faces,
and the motor.
1b3
Severe Phase Unbalance -
CMR
All Running Modes
Same as diagnostic 1b2.
Compressor B
1b4
Severe Phase Unbalance -
CMR
All Running Modes
Same as diagnostic 1b2.
Compressor C
1b5
Severe Phase Unbalance -
CMR
All Running Modes
Same as diagnostic 1b2.
Compressor D
1b6
Overload Setting -
IFW
All
a. The CPM NovRam Based overload
Compressor A
setting did not agree with the MCSP
Dip Switch overload setting for 30
contiguous seconds. The affected
MCSP shall use the minimum (00000
binary, 00 decimal) overload setting as
a default until the UCM is reset when
this diagnostic occurs.
1b8
Overload Setting -
IFW
All
Same as diagnostic 1b6.
Compressor C
1b9
Overload Setting -
IFW
All
Same as diagnostic 1b6.
Compressor D
1bA
Phase Unbalance -
CMR
All Running Modes
a. A 15% phase unbalance has been
Compressor A
detected. Menu Item “47” is enabled.
1bb
Phase Unbalance -
CMR
All Running Modes
Same as diagnostic 1bA.
Compressor B
1bC
Phase Unbalance -
CMR
All Running Modes
Same as diagnostic 1bA.
Compressor C
1bd
Phase Unbalance -
CMR
All Running Modes
Same as diagnostic 1bA.
Compressor D
Summary of Contents for RTAA-130
Page 2: ... American Standard Inc 1991 ...
Page 8: ...8 RTAA IOM 3 ...
Page 24: ...24 RTAA IOM 3 ...
Page 50: ...50 RTAA IOM 3 Figure 30 Refrigerant Circuit Identification ...
Page 52: ...52 RTAA IOM 3 Figure 31 Remote Evaporator Piping Example ...
Page 59: ...59 RTAA IOM 3 Continued from Previous Page See Notes on Next Page ...
Page 63: ...63 RTAA IOM 3 Continued from Previous Page See Notes on Page 61 ...
Page 65: ...65 RTAA IOM 3 Continued from Previous Page See Notes on Page 61 ...
Page 76: ...76 RTAA IOM 3 ...
Page 92: ...92 RTAA IOM 3 Figure 51 Operator Interface Controls ...
Page 120: ...120 RTAA IOM 3 ...
Page 127: ...127 RTAA IOM 3 Continued from Previous Page 2307 1566C ...
Page 128: ...128 RTAA IOM 3 Figure 57 Unit Sequence of Operation RTAA 130 to 200 Tons 2306 9122A ...
Page 132: ...132 RTAA IOM 3 Figure 58 Operator s Log ...
Page 138: ...138 RTAA IOM 3 ...