Diagnostics
158 RTAC-SVX01J-EN
Low Evaporator
Liquid Level - Circuit
1
None Info NonLatch
Starter Contactor
Energized
[all Stop modes]
The liquid level sensor is seen to be at or near its low end of range
for 80 contiguous minutes while the compressor is running.
Design: 20% or less of bit count corresponding to -21.2 mm or
less liquid level for 80 minutes)
Remote
Low Evaporator
Liquid Level - Circuit
2
None Info NonLatch
Starter Contactor
Energized
[all Stop modes]
The liquid level sensor is seen to be at or near its low end of range
for 80 contiguous minutes while the compressor is running.
Design: 20% or less of bit count corresponding to -21.2 mm or
less liquid level for 80 minutes)
Remote
Low Evaporator
Refrigerant
Temperature -
Circuit 1
Circuit Immediate Latch
All Ckt Running
Modes
The inferred Saturated Evap Refrigerant Temperature
(calculated from suction pressure transducer dropped below the
Low Refrigerant Temperature Cutout Setpoint for 1125 F-sec
with a 8 F-sec/sec max integral rate applied during circuit
startup transient (or 4ºF-s/s if manifolded and only one cprsr
running) while the circuit was running early in the circuit's cycle.
The minimum LRTC setpoint is -5 F (18.7 Psia) the point at which
oil separates from the refrigerant. During the time that the trip
integral is non zero, the unload solenoid(s) of the running
compressors on the circuit, shall be energized continuously and
the load solenoid shall be off. Normal load/unload operation will
be resumed if the trip integral decays to zero by temps above the
cutout setpoint. The integral is held nonvolatily though power
down, is continuously calculated, and can decay during the
circuit's off cycle as conditions warrant.
Remote
Low Evaporator
Refrigerant
Temperature -
Circuit 2
Circuit Immediate Latch
All Ckt Running
Modes
The inferred Saturated Evap Refrigerant Temperature
(calculated from suction pressure transducer dropped below the
Low Refrigerant Temperature Cutout Setpoint for 1125 F-sec
with a 8 F-sec/sec max integral rate applied during circuit
startup transient (or 4ºF-s/s if manifolded and only one cprsr
running) while the circuit was running early in the circuit's cycle.
The minimum LRTC setpoint is -5 F (18.7 Psia) the point at which
oil separates from the refrigerant. During the time that the trip
integral is non zero, the unload solenoid(s) of the running
compressors on the circuit, shall be energized continuously and
the load solenoid shall be off. Normal load/unload operation will
be resumed if the trip integral decays to zero by temps above the
cutout setpoint. The integral is held nonvolatily though power
down, is continuously calculated, and can decay during the
circuit's off cycle as conditions warrant.
Remote
Low Evaporator
Temp - Ckt 1: Unit
Off
Evap
Pump
Special
Mode
NonLatch
Unit in Stop Mode,
or in Auto Mode
and No Ckt's
Energzd
[Any Ckt Energzd]
Any of the evap sat temps fell below the water temp cutout
setting while the respective evap liquid level was greater than -
21.2mm for 150 degree F seconds while Chiller is in the Stop
mode, or in Auto mode with no compressors running. Energize
Evap Water pump Relay until diagnostic auto resets, then return
to normal evap pump control. Automatic reset occurs when
either the evap temp rises 2 F (1.1 C) above the cutout setting
or the liquid level falls below -21.2mm for 30 minutes
Remote
Low Evaporator
Temp - Ckt 2: Unit
Off
Evap
Pump
Special
Mode
NonLatch
Unit in Stop Mode,
or in Auto Mode
and No Ckt's
Energzd
[Any Ckt Energzd]
Any of the evap sat temps fell below the water temp cutout
setting while the respective evap liquid level was greater than -
21.2mm for 150 degree F seconds while Chiller is in the Stop
mode, or in Auto mode with no compressors running. Energize
Evap Water pump Relay until diagnostic auto resets, then return
to normal evap pump control. Automatic reset occurs when
either the evap temp rises 2 F (1.1 C) above the cutout setting
or the liquid level falls below -21.2mm for 30 minutes
Remote
Low Oil Flow -
Compressor 1A
Cprsr Immediate Latch
Cprsr Energized
and Delta P above
35 Psid
The intermediate oil pressure transducer for this compressor
was out of the acceptable pressure range for 15 seconds, while
the Delta Pressure was greater than 35 Psid.: Acceptable range
is 0.50 > (PC-PI) / (PC-PE) for the first 2.5 minutes of operation,
and 0.25 > (PC-PI) / (PC-PE) thereafter,
Local
Low Oil Flow -
Compressor 1B
Cprsr Immediate Latch
Cprsr Energized
and Delta P above
35 Psid
The intermediate oil pressure transducer for this compressor
was out of the acceptable pressure range for 15 seconds, while
the Delta Pressure was greater than 35 Psid.: Acceptable range
is 0.50 > (PC-PI) / (PC-PE) for the first 2.5 minutes of operation,
and 0.25 > (PC-PI) / (PC-PE) thereafter,
Local
Table 67. Main processor diagnostics (continued)
Diagnostic Name
Affects
Target Severity
Persist-
ence
Active Modes
[Inactive
Modes] Criteria
Reset
Level
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