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RTAC-SVX01F-EN 129
Diagnostics
5E2 Comm Loss: Outdoor Air
Temperature
Normal Latch Continual loss of communication between the MP and the Functional
ID has occurred for a 30 second period. Note that if this diagnostic
occurs, operational pumpdown will be performed regardless of the last
valid temperature
Remote
690 Comm Loss: Starter 1A Immediate Latch Same as Comm Loss: Chilled Water Flow Switch Local
691 Comm Loss: Starter 1B Immediate Latch Same as Comm Loss: Chilled Water Flow Switch Local
692 Comm Loss: Starter 2A Immediate Latch Same as Comm Loss: Chilled Water Flow Switch Local
693 Comm Loss: Starter 2B Immediate Latch Same as Comm Loss: Chilled Water Flow Switch Local
6AC Comm Loss: Starter Panel
High Temperature Limit -
Panel 1, Cprsr 1B
Info Latch Same as Comm Loss: Chilled Water Flow Switch Local
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 fixed 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
Hex
Code
Diagnostic Name
and Source
Severity Persis-
tence
Criteria Reset
Level