80
RLC-SVX09Q-EN
Table 32. Main processor diagnostics (continued)
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
Loss of Oil for
Compressor
(Running)
Circuit Immediate Latch
Starter Contactor
Energized
In running modes, Oil Loss Level Sensor detects lack of oil
in the oil sump feeding the compressor (distinguishing a
liquid flow from a vapor flow).
Local
Loss of Oil for
Compressor
(Stopped)
Circuit
Immediate and
Special Action
Latch
Compressor Pre-
Start
[all other modes]
Oil Loss Level Sensor detects a lack of oil in the oil sump
feeding the compressor for 90 seconds after EXV
preposition is completed (and before EXV equalization, if
applicable) on an attempted circuit start. Note: Compressor
start is delayed pending oil detection during that time, but
not allowed once the diagnostic occurs.
Local
Low Condenser
Rfgt Temp Circuit
1: Unit Off
Chiller
Special Action
NonLatch
Unit in Stop
Mode, or in Auto
Mode and No
Ckt(s) Energized
[Any Ckt
Energized]
This diagnostic is based on dew point from condenser
refrigerant pressure transducer of circuit 1 falling below the
Condenser Freeze Avoidance Setpoint. When this
diagnostic is active, both the Condenser Water Freeze
Avoidance Request Relay is turned on and the Condenser
Water Pump request is placed in a “Diagnostic Override
mode” and forced on regardless of the chiller mode. The
diagnostic is auto cleared when both the saturated
temperature is 2°F (1.1°C) above the Condenser Freeze
Avoidance Setpoint for 1 minute and the anti short cycling
count down calculation reaches 0 (see Low Rfgt Condenser
Temperature Protection spec), or with the start of either
circuit. This diagnostic even while active, does not prevent
operation of either circuit.
Remote
Low Differential
Refrigerant
Pressure - xy
Cprsr
Immediate Latch
Cprsr Energized
For start-up, please refer to oil flow protection spec. For
running, the system differential pressure for the respective
circuit was below the greater of 25 psid (240.5 kPa) or the
pressure ratio listed in the table in GP2 Compressor Type
FSpec while the compressor is running for a period of time
dependent on the deficit (15 seconds ignore time from
circuit start) – refer to the Oil Flow Protection specification
for the time to trip function.
Remote
Low Discharge
Superheat - xy
Cprsr
Normal Latch
Any Running
Mode
While Running Normally, the Compressor Discharge
Superheat was less than the Low Discharge Superheat
Setpoint (default 10°F) for more than 6500 degree F
seconds. At circuit start-up, the Discharge Superheat will
be ignored for 5 minutes.
Remote
Diagnostics
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