Trane Tracer CH530 - Evaporator Temperature and Flow Diagnostics

CG-SVU02C-E440
Main Processor Diagnostics
Diagnostic Name
Affects
Ta r g e t
Severity Persistence
Active Modes
[Inactive Modes]
Criteria Reset Level
Low Evaporator
Temp - Ckt 1: Unit
Off
Evap (and
circ) Pump
Special
Action
NonLatch
Unit in Stop Mode, or
in Auto Mode and No
Ckt's Energzd [Any
Ckt Energzd]
The respective evap sat temp fell below the water temp
cutout setting while the evap liquid level was greater
than -36 mm for 150º-sec degree F seconds while
Chiller is in the Stop mode, or in Auto mode with no
compressors running. Energize small Evap Circulating
Pump (RTUD A/C) and Evap Water pump Relay (but only
if "Evap Water Pump Diagnostic Override" setting is
enabled) until diagnostic auto resets, then de-energize
the circ pump and return to normal evap pump control.
Automatic reset occurs when the derived evap sat temp
rises 2°F (1.1°C) above the cutout setting for 1 minute or
the liquid level is below -36.0 mm for 20 minutes, or any
compressor restarts. OA temp is substituted for evap
sat temp in case of invalidity. This diagnostic even while
active, does not prevent operation of either circuit.
Remote
Low Evaporator
Temp - Ckt 2: Unit
Off
Evap (and
circ) Pump
Special
Action
NonLatch
Unit in Stop Mode, or
in Auto Mode and No
Ckt's Energzd [Any
Ckt Energzd]
The respective evap sat temp fell below the water temp
cutout setting while the evap liquid level was greater
than -36 mm for 150º-sec degree F seconds while
Chiller is in the Stop mode, or in Auto mode with no
compressors running. Energize small Evap Circulating
Pump (RTUD A/C) and Evap Water pump Relay (but only
if "Evap Water Pump Diagnostic Override" setting is
enabled) until diagnostic auto resets, then de-energize
the circ pump and return to normal evap pump control.
Automatic reset occurs when the derived evap sat temp
rises 2°F (1.1°C) above the cutout setting for 1 minute or
the liquid level is below -36.0 mm for 20 minutes, or any
compressor restarts. OA temp is substituted for evap
sat temp in case of invalidity. This diagnostic even while
active, does not prevent operation of either circuit.
Remote
Low Evaporator
Water Temp: Unit On
Chiller Immediate
and Special
Action
NonLatch
Any Ckt[s] Energzd
[No Ckt(s) Energzd]
The evaporator water temp. fell below the cutout
setpoint for 30 degree F Seconds while the compressor
was running. Automatic reset occurs when the
temperature rises 2° F (1.1°C) above the cutout setting
for 2 minutes. This diagnostic shall not de-energize the
Evaporator Water Pump Output.
Remote
Evaporator Water
Flow Overdue
Chiller Normal
NonLatch
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
Evaporator Water
Flow Lost
Chiller Immediate
NonLatch
[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