Installation and Maintenance Manual

Diagnostics
RLC-SVX09H-EN 199
Evaporator Approach
Error – Circuit 1
Circuit Immediate Latch
Respective circuit
running
The Evaporator approach temperature for the
respective circuit (ELWT – Evap Sat Temp Ckt
x) is negative by 10ºF or more, for 1 minute
continuously while the circuit/compressor is
operating. Either the Evap Leaving Water Temp
sensor, or Evap Suction Rfgt Pressure
Transducer Ckt 1 is in error.
Remote
Evaporator Approach
Error – Circuit 2
Circuit Immediate Latch
Respective circuit
running
The Evaporator approach temperature for the
respective circuit (ELWT – Evap Sat Temp Ckt
x) is negative by 10ºF or more, for 1 minute
continuously while the circuit/compressor is
operating. Either the Evap Leaving Water Temp
sensor, or Evap Suction Rfgt Pressure
Transducer Ckt 2 is in error.
Evaporator Entering
Water Temperature
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 Leaving
Water Temperature
Sensor
Chiller Normal Latch All Bad Sensor or LLID Remote
Evaporator Liquid Level
Sensor – Circuit 1
Circuit Normal Latch All Bad Sensor or LLID Remote
Evaporator Liquid Level
Sensor – Circuit 2
Circuit Normal Latch All Bad Sensor or LLID Remote
Evaporator Water Flow
(Entering Water Temp)
None Info Non Latch
Any Ckt(s) Energzd
[No Ckt(s)
Energzd]
The entering evaporator water temp fell below
the leaving evaporator water temp by more
than 2°F for 100F-sec. For falling film
evaporators, this diagnostic cannot reliably
indicate loss of flow, but can warn of improper
flow direction through the evaporator,
misbound water temperature sensors,
improper sensor installation, partially failed
sensors, or other system problems. Note that
either entering or leaving water temp sensor
could be at fault.
Remote
Evaporator Water Flow
Lost
Chiller Immediate Non Latch [All Stop modes]
a. The Evaporator water flow switch input was
open for more than 6 contiguous seconds (or 15
seconds for thermal dispersion type flow
switch). b. This diagnostic does not de-energize
the evap pump output c. 6 seconds of
contiguous flow shall clear this diagnostic.
Remote
Evaporator Water Flow
Overdue
Chiller Normal Non Latch
Estab. Evap. Water
Flow on going from
STOP to AUTO or
Evap Pump
Override.
Evaporator water flow was not proven within 20
minutes of the Evaporator water pump relay
being energized in normal “Stop” to “Auto”
transition. If the pump is overridden to “On” for
certain diagnostics, the delay on diagnostic
callout shall be only 255 seconds. The pump
command status will not be effected by this
diagnostic in either case.
Remote
Excessive Condenser
Pressure – Circuit 1
Circuit Immediate Latch All
The condenser pressure transducer of this
circuit has detected a pressure in excess of the
safe high side pressure as limited by the
particular compressor type or the evaporator
distributor present on this particular chiller. For
Air Cooled Condenser, check for dirty coils or
any fouling or restrictions as well as proper
operation and rotational direction of all fans.
Remote
Table 134. Main Processor Diagnostics (continued)
Diagnostic Name
Affects
Target Severity Persistence
Active Modes
[Inactive
Modes] Criteria
Reset
Level