Installation and Maintenance Manual

Diagnostics
80 RTAE-SVX001B-EN
Interrupt
Failure – AFD2A
Circuit
Immediate
Shutdown
and Special
Action
Latch
AFD intended to
be OFF
Respective AFD is reporting that it is still running the
compressor when the MP has commanded the drive/
compressor to be Off. Detection time shall be 10 seconds
minimum and 15 seconds maximum. On detection and until the
controller is manually reset: this diagnostic shall be active and
the alarm relay shall be energized, the Evap Pump Output will
be energized, the effected compressor will be continually
commanded off, and be unloaded, while a normal stop shall be
commanded to all other compressors. For as long as
compressor operation continues, the MP shall continue liquid
level, oil return, and fan control on the circuit effected.
Local
LCI-C Software
Mismatch: Use
BAS Tool
Chiller Info Nonlatch All
The neuron software in the LCI-C module does not match the
chiller type. Download the proper software into the LCI-C
neuron. To do this, use the Rover service tool, or a LonTalk
®
tool capable of downloading software to a Neuron 3150
®
.
Remote
Loss of Oil
(Running) -
Cprsr1A
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
(Running) -
Cprsr2A
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
(Stopped) –
Cprsr1A
Circuit
Immediate
Shutdown
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 on an attempted circuit start. Note: Compressor
start is delayed pending oil detection during that time, but not
allowed once the diagnostic occurs.
Local
Loss of Oil
(Stopped) –
Cprsr2A
Circuit
Immediate
Shutdown
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 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 Differential
Rfgt Pressure -
Ckt1
Circuit Immediate Latch Cprsr Energized
The system differential pressure (Pc-Pe) for the respective
circuit was below 25 psid (240.5 kPa) or the pressure ratio (Pc/
Pe) was less than 1.1 while the compressor is running for a
period of time dependent on the deficit (15 sec ignore time
from circuit start). Refer to the Oil Flow Protection specification
for the time to trip function.
Remote
Low Differential
Rfgt Pressure -
Ckt2
Circuit Immediate Latch Cprsr Energized
The system differential pressure (Pc-Pe) for the respective
circuit was below 25 psid (240.5 kPa) or the pressure ratio (Pc/
Pe) was less than 1.1 while the compressor is running for a
period of time dependent on the deficit (15 sec ignore time
from circuit start). Refer to the Oil Flow Protection specification
for the time to trip function.
Remote
Low Discharge
Superheat –
Ckt1
Circuit Normal Latch
Any Running
Mode
While Running Normally, the Discharge Superheat was less
than 9 degrees F for more than 4878 degree F seconds. At
circuit startup, the Discharge Superheat will be ignored for 5
minutes.
Remote
Low Discharge
Superheat –
Ckt2
Circuit Normal Latch
Any Running
Mode
While Running Normally, the Discharge Superheat was less
than 9 degrees F for more than 4878 degree F seconds. At
circuit startup, the Discharge Superheat will be ignored for 5
minutes.
Remote
Low Evaporator
Rfgt Pressure -
Ckt1
Circuit Immediate Latch
Cprsr Prestart
and Cprsr
Energized
a. The Evap Refrig Pressure dropped below 10 Psia just prior to
compressor start (after EXV preposition).
b. During Early Startup Period: the Evap Refrig Pressure fell
below a pressure equal to Condenser Pressure ÷ 8 but as
limited to not less than 6 or greater than 10 psia.
c. After Early Startup Period expires: The Evap Refrig Pressure
fell below 16 Psia for 30 seconds or below 10 psia for 5 seconds.
(Note: the Early Startup Period for RTAE it is between 1 and 5
min as an inverse function of the Cond Temp measured at time
of circuit startup).
Local
Table 33. Main processor diagnostics (continued)
Diagnostic
Name
Affects
Target Severity Persistence
Active Modes
[Inactive
Modes] Criteria
Reset
Level