85 RTAC-SVX002A-EN
Diagnostics
Hex
Code
Diagnostic Name and
Source
Severity Persistence Criteria Reset Level
6AB Comm Loss: Starter Panel
High Temperature Limit –
Panel 1, Cprsr 2A
Info Latch Same as Comm Loss: Chilled Water Flow Switch Local
6AD Comm Loss: Starter Panel High
Temperature Limit – Panel 2,
Cprsr 2B
Info Latch Same as Comm Loss: Chilled Water Flow Switch
Local
6A0 Comm Loss: Status/
Annunciation Relays
Info Latch Same as Comm Loss: Chilled Water Flow Switch
Remote
5FB Comm Loss: Suction Pressure
Cprsr 1A
Immediate Latch Continual loss of communication between the MP and the Functional ID
has occurred for a 30 second period. Circuit target if no isolation valves,
Compressor target if isolation valves or simplex. Design Note: In the case
of manifolded compressors w/o isolation valves, the occurrence of this
diagnostic will also generate a comm loss with the nonexistent Suction
Press Cprsr 2B in order to accomplish circuit shutdown.
Remote
5FC Comm Loss: Suction Pressure
Cprsr 1B
Immediate Latch Continual loss of communication between the MP and the Functional ID
has occurred for a 30 second period. Design Note: For circuits with
manifolded compressors w/o isolation valve option, this diagnostic will
occur with the preceding diagnostic, even though this transducer is
not required or installed.
Remote
5FD Comm Loss: Suction Pressure
Cprsr 2A
Immediate Latch Same as Comm Loss: Suction Pressure Cprsr 1A
Remote
5FE Comm Loss: Suction Pressure
Cprsr 2B
Immediate Latch Same as Comm Loss: Suction Pressure Cprsr 1B
Remote
2A1 Condenser Fan Variable Speed
Drive Fault – Circuit 1 (Drive 1)
Special
Mode
Latch The MP has received a fault signal from the respective condenser fan
Variable Speed Inverter Drive, and unsuccessfully attempted (5 times
within 1 minute of each other) to clear the fault. The 4th attempt removes
power from the inverter to create a power up reset. If the fault does not
clear, the MP will revert to constant speed operation without the use
of the inverter's fan. The inverter must be manually bypassed, and fan
outputs rebound, for full xed speed fan operation.
Remote
5B4 Condenser Fan Variable Speed
Drive Fault – Circuit 1 Drive 2
Special
Mode
Latch Same as Condenser Fan Variable Speed Drive Fault – Circuit 1 (Drive 1)
Remote
2A2 Condenser Fan Variable Speed
Drive Fault – Circuit 2 (Drive 1)
Special
Mode
Latch Same as Condenser Fan Variable Speed Drive Fault – Circuit 1 (Drive 1)
Remote
5B5 Condenser Fan Variable Speed
Drive Fault – Circuit 2 (Drive 2)
Special
Mode
Latch Same as Condenser Fan Variable Speed Drive Fault – Circuit 1 (Drive 1)
Remote
5B8 Condenser Refrigerant Pressure
Transducer – Circuit 1
Immediate Latch Bad Sensor or LLID
Remote
5B9 Condenser Refrigerant Pressure
Transducer – Circuit 2
Immediate Latch Bad Sensor or LLID
Remote
FD Emergency Stop Immediate Latch EMERGENCY STOP 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
8E Evaporator Entering Water
Temperature Sensor
Info Latch Bad Sensor or LLID a. Normal operation, no effects on control. b. Chiller
shall remove any Return or Constant Return Chilled Water Reset, if it was
in effect. Apply slew rates per Chilled Water Reset spec.
Remote
AB Evaporator Leaving Water
Temperature Sensor
Normal Latch Bad Sensor or LLID
Remote
27D Evaporator Liquid Level Sensor
- Circuit 1
Immediate Latch Bad Sensor or LLID
Remote
3F9 Evaporator Liquid Level Sensor
- Circuit 2
Immediate Latch Bad Sensor or LLID
Remote
6B9 Evaporator Rfgt Drain - Circuit 1 NA Latch This diagnostic is effective only with Remote Evap units. The liquid level
of the respective evaporator was not seen to be below the level of -21.2
mm (0.83 in) within 5 minutes of the commanded opening of its Drain Valve
Solenoid. The diagnostic will not be active if the drain valve is commanded
closed.
Remote
6BA Evaporator Rfgt Drain - Circuit 2 NA Latch Same as Evaporator Rfgt Drain - Circuit 1
Remote
ED EvaporatorWater Flow Lost Immediate NonLatch a. The chilled water ow switch input was open formore than 6-10
contiguous seconds. b. This diagnostic does not de-energize the evap
pump output c. 6-10 seconds of contiguous ow shall clear this diagnostic.
d. Even though the pump times out in the STOP modes, this diagnostic
shall not be called out in the STOP modes. Note that this diagnostic will not
light the red diagnostic light on the Easy View display.
Remote
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