Trane S Series - Page 82

82
RLC-SVX09Q-EN
Table 32. Main processor diagnostics (continued)
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
Low Evaporator
Refrigerant
Temperature
Circuit 2: Unit Off
Chiller
Special Action
NonLatch
Unit in Stop
Mode, or in Auto
Mode and No
Ckt(s) Energized
[Any Ckt
Energized]
The respective circuit’s LERTC Integral was seen to be > 0
while the chiller is in the Stop mode, or in Auto mode with
no compressors running for at least one minute. The
LERTC integral is increased if the Evap Refrigerant Pool
Temp is below the value of the Low Evap Rfgt Temp Cutout
+ 2°F. Energize Evap Water Pump and Off-Cycle Freeze
Avoidance Request Relay until diagnostic auto resets, then
return to normal evap pump control and de-energize the
Freeze Avoidance Request. Automatic reset occurs when
the respective Evap Rfgt Pool Temp rises 4°F(1.1°C) above
the LERTC cutout setting for 1 minute and the Chiller Off
LERTC Integral = 0.. This diagnostic even while active,
does not prevent operation of either circuit.
Remote
Low Evaporator
Water
Temperature
(Unit Off)
Chiller
Special Action
NonLatch
Unit in Stop
Mode, or in Auto
Mode and No
Ckt(s) Energized
[Any Ckt
Energized]
Either the entering or leaving evaporator water temp fell
below the leaving water temp cutout setting for 30 degree
F-seconds while the Chiller is in the Stop mode, or in Auto
mode with no compressors running. Energize Freeze
Avoidance Request Relay and Evap Water Pump Relay
until diagnostic auto resets, then de-energize the Freeze
Avoidance Request Relay and return to normal evap pump
control. Automatic reset occurs when both temps rise 2°F
(1.1°C) above the cutout setting for 5 minutes, or either
circuit starts. This diagnostic even while active, does not
prevent operation of either circuit.
Remote
Low Evaporator
Water
Temperature
(Unit On)
Chiller
Immediate and
Special Action
NonLatch
Any Ckt[s]
Energized
[No Ckt(s)
Energized]
The evaporator entering or leaving water temperature fell
below the cutout setpoint for 30 degree F Seconds while
the compressor was running. Automatic reset occurs when
both of 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
Low Oil Flow - xy Cprsr
Immediate Latch
Cprsr Energized
and Delta P
above 15 Psid
The intermediate oil pressure sensor for this compressor
was out of the acceptable pressure range for 15 seconds,
while the Delta Pressure was greater than 15 Psid (172.4
kPa).: Acceptable range is 0.50 > (PC-PI) / (PC-PE) for the
first 2.5 minutes of operation, and 0.28 > (PC-PI) / (PC-PE)
thereafter.
Local
Main Power Loss Chiller
Immediate
Shutdown and
Special Action
NonLatch All
As soon as Main Power is lost, diagnostic is triggered.
Diagnostic will be released after 6 seconds debounce time.
Energize Evap Water Pump Relay until diagnostic auto
resets, then return to normal evap pump control.
Local
Diagnostics