87 RTAC-SVX002A-EN
Diagnostics
Hex
Code
Diagnostic Name and
Source
Severity Persistence Criteria Reset Level
5BE Intermediate Oil Pressure
Compressor 2A
Immediate Latch Bad Sensor or LLID Remote
BF High Pressure Cutout –
Compressor 2B
Immediate Latch Same as High Pressure Cutout - Compressor 1A Local
5BE Intermediate Oil Pressure
Transducer - Compressor 1A
Immediate Latch Bad Sensor or LLID Remote
5BF Intermediate Oil Pressure
Transducer - Compressor
1B
Immediate Latch Bad Sensor or LLID Remote
5C0 Intermediate Oil Pressure
Transducer - Compressor 2A
Immediate Latch Bad Sensor or LLID Remote
5C1 Intermediate Oil Pressure
Transducer - Compressor 2B
Immediate Latch Bad Sensor or LLID Remote
C5 Low Chilled Water Temp:
Unit Off
Special
Mode
NonLatch The leaving chilled water temp. fell below the leaving water temp
cutout setting for 30 degree F seconds while the 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 the temp rises 2°F
(1.1°C) above the cutout setting for 30 minutes.
Remote
C6 Low Chilled Water Temp:
Unit On
Immediate
and Special
Mode
NonLatch The chilled water temp. fell below the cutout setpoint for 30 degree F
Seconds while the compressor was running. Automatic reset occurs
when the temperature rises 2 °F (1.1°C) above the cutout setting for 2
minutes. This diagnostic shall not de-energize the Evaporator
Water Pump Output.
Remote
1AE Low Differential Refrigerant
Pressure - Circuit 1
Immediate Latch The system differential pressure for the respective circuit was below
35 Psid for more than 2000 Psid-sec with either a 1 minute (single
cprsr circuit) or 2.5 minute (manifolded cprsr circuit) ignore time from
the start of the circuit.
Remote
1AF Low Differential Refrigerant
Pressure - Circuit 2
Immediate Latch Same as Low Differential Refrigerant Pressure - Circuit 1 Remote
583 Low Evaporator Liquid Level
- Circuit 1
Info NonLatch 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
5B6 Low Evaporator Liquid Level
- Circuit 2
Info NonLatch Same as Low Evaporator Liquid Level - Circuit 1 Remote
194 Low Evaporator Refrigerant
Temperature - Circuit 1
Immediate Latch a. The inferred Saturated Evap Refrigerant Temperature (calculated
from suction pressure transducer(s)) dropped below the Low
Refrigerant Temperature Cutout Setpoint for 120°F-sec (8°F-sec max
rate) while the circuit was running after the ignore period had expired.
The integral is held at zero for the ignore time (which is a function of
outdoor air temp) following the circuit startup and the integral will be
limited to never trip in less than 15 seconds, i.e. the error term shall
be clamped to 8°F The minimum LRTC setpoint is -5°F (18.7 Psia) the
point at which oil separates from the refrigerant. b. During the timeout
of the trip integral, the unload solenoid(s) of the running compressors
on the circuit, shall be energized continuously. Normal load/unload
operation will be resumed if the trip integral is reset by return to temps
above the cutout setpoint.
Remote
195 Low Evaporator Refrigerant
Temperature - Circuit 2
Immediate Latch Same as Low Evaporator Refrigerant Temperature - Circuit 1 Remote
6B3 Low Evaporator Temp – Ckt
1: Unit Off
Special
Mode
NonLatch 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
30 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
6B3 Low Evaporator Temp – Ckt
2: Unit Off
Special
Mode
NonLatch Same as Low Evaporator Temp - Ckt 1: Unit Off Remote
198 Low Oil Flow – Compressor
1A
Immediate Latch 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 rst 2.5 minutes of operation, and 0.25 > (PC-PI)
/ (PC- PE) there after,
Local
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