RLC-SVX09Q-EN
75
Main Processor Diagnostics
Table 32. Main processor diagnostics
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
BAS
Communication
Lost
Chiller
Warning and
Special Action
NonLatch All
The BAS was setup as "installed" at the MP and the Lontalk
LCIC lost communications with the BAS for 15 contiguous
minutes after it had been established. Refer to Section on
Setpoint Arbitration to determine how setpoints and
operating modes may be affected by the comm loss. The
chiller follows the value of the Tracer Default Run
Command which can be previously written by Tracer and
stored nonvolatile by the MP (either use local or shutdown).
Note that this diagnostic is never operational for BacNet
Communication interface (BCIC) and only operational with
a LonTalk Communication interface (LCIC) if so configured
by the BAS or Tracer system.
Remote
Low Condenser
Rfgt Temp Circuit
2: 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 2 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 2ºF (1.1ºC) 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
BAS Failed to
Establish
Communication
Chiller
Warning and
Special Action
NonLatch
At power-up
The BAS was setup as "installed" and the BAS did not
communicate with the Lontalk LCIC within 15 minutes after
chiller controls power-up. Refer to Section on Setpoint
Arbitration to determine how setpoints and operating
modes may be affected. Note that this diagnostic is never
operational for BacNet Communication interface (BCIC)
and only operational with a LonTalk Communication
interface (LCIC) if so configured by the BAS or Tracer
system.
Remote
Chiller Service
Recommended
Chiller
Warning
Latch
Service
Messages
Enabled
Chiller service interval time has elapsed. Chiller service is
recommended.
Remote
Diagnostics
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