
Diagnostics
82
RTAF-SVX001K-EN
Main Processor Diagnostics
Table 33. Main processor diagnostics
Diagnostic Name
Affects
Target
Severity Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
AFD%RLA Feedback - xA
Cprsr
Normal
Latch
All
Out-Of-Range Low or Hi or bad LLID
Remote
Chiller Service Recommended
Chiller
Warning
Latch
Service
Messages
Enabled
Chiller service interval time has elapsed.
Chiller service is recommended.
Remote
Compressor Discharge Refrigerant
Temperature Sensor - xy
Cprsr Disch Rfgt Temp Sensor - xy
Disch Rfgt Temp Sensor - xy
Cprsr
Immediate
Latch
All
Bad Sensor or LLID
Remote
Condenser Refrigerant Pressure Sensor
Condenser Rfgt Pressure Sensor
Cond Rfgt Pressure Sensor
Circuit Immediate
Latch
All
Bad Sensor or LLID
Remote
Emergency Stop Feedback Input
Emergency Stop
Chiller Immediate
Latch
All
EMERGENCY STOP FEEBBACK INPUT is
open. An external interlock has tripped.
Time to trip from input opening to unit stop
shall be 0.1 to 1.0 seconds.
Local
Evap Water Pump 1 Svc Recommended
Evap Water Pump 1 Svc Recom
Chiller
Info
Latch
Service
Messages
Enabled
Pump service recommended as service
interval hours have elapsed.
Remote
Evap Water Pump 2 Svc Recommended
Evap Water Pump 2 Svc Recom
Chiller
Info
Latch
Service
Messages
Enabled
Pump service recommended as service
interval hours have elapsed.
Remote
Evaporator Approach Error
Circuit Immediate
Latch
Respective
circuit running
The Evaporator approach temperature for
the respective circuit (ELWT – Evap Sat
Temp Ckt x) is negative by more than 10°F
for 1 minute continuously while the circuit
/ compressor is operating. Either the Evap
Leaving Water Temp sensor or Evap
Suction Rfgt Pressure Sensor Ckt x is in
error.
Remote
Evaporator Entering Water Pressure
Evap Entering Water Pressure
Chiller
Warning
Latch
All
Bad Sensor or LLID
Remote
Evaporator Entering Water Temperature
Sensor
Evaporator Entering Water Temp Sensor
Evap Ent Water Temp Sensor
Chiller
Normal
Latch
All
Bad Sensor or LLID. Note: Entering Water
Temp Sensor is used in EXV pressure
control as well as ice making so it must
cause a unit shutdown even if ice or CHW
reset is not installed.
Remote
Evaporator Isolation Valve Closed Switch
Failure
Evap Isolation Valve Closed Switch
Failure
Evap Iso Vlv Closed Sw Fail
Circuit Immediate
Latch
All
Evaporator isolation valve open limit
switch state does not match expected
value. See Evaporator Isolation Valve spec
for details.
Local
Evaporator Isolation Valve Failed To
Close
Evap Isolation Valve Failed To Close
Evap Iso Vlv Failed To Close
Circuit Immediate
Latch
All
Evaporator isolation valve was
commanded to close, but limit switches did
not make expected changes within allotted
time. See Evaporator Isolation Valve spec
for details.
Local
Evaporator Isolation Valve Failed To Open
Evap Isolation Valve Failed To Open
Evap Iso Vlv Failed To Open
Circuit Immediate
Latch
All
Evaporator isolation valve was
commanded to open, but limit switches did
not make expected changes within allotted
time. See Evaporator Isolation Valve spec
for details.
Local
Evaporator Isolation Valve Illegal Switch
State
Evap Isolation Valve Illegal Switch State
Evap Iso Vlv Illegal Sw Stat
Circuit Immediate
Latch
All
Both evaporator isolation valve limit
switches were closed at the same time,
which should not be possible. Check for
limit switch failure or improperly adjusted
switch points.
Local