Trane CGWN 205-211 - Manual (Page 26)

Diagnostics
CG-SVU02B-E4 26
Evaporator Entering Water
Temp Sensor Chiller Normal Latch All Bad Sensor or LLID Remote
Evaporator Leaving Water
Temp Sensor Chiller Normal Latch All Bad Sensor or LLID Remote
Condenser Entering Water
Temp Sensor Chiller Warning Latch All Bad Sensor or LLID Remote
Condenser Leaving Water
Temp Sensor Chiller Warning Latch All Bad Sensor or LLID Remote
Discharge Pressure
Transducer Circuit Normal Latch All Bad Sensor or LLID Remote
Suction Pressure Transducer Circuit Immediate Latch All Bad Sensor or LLID Remote
Suction Temperature Sensor Circuit Normal Latch All Bad Sensor or LLID Remote
Evaporator Protection Water
Temp Sensor Circuit Normal Latch All Bad Sensor or LLID Remote
Low Evap Leaving Water
Temp: Unit Off Chiller or
Circuit
Warning
and Special
Action
NonLatch Unit in Stop
Mode, or in
Auto Mode
and No
Ckt(s)
Energized
[Any Ckt
Energized]
a) The leaving chilled water temperature fell below the leaving
water temp cutout setting for 16.6°C- seconds while the Chiller
is in the Stop mode, or in Auto mode with no compressors
running. Energize Evap Water pump Relay until diagnostic auto
resets, then return to normal evap pump control. Automatic
reset occurs when the temp rises 1.1°C above the cutout
setting for 30 minutes. When this diagnostic is active AND
Leaving Water Temperature sensor diagnostic (loss of comm or
out of range) the Evap Water pump relay shall be de-energized.
b) If evaporator protection temperature sensors are installed,
the effect is on the appropriate circuit. Else, the effect is on the
chiller. Remote
Low Evap Leaving Water
Temp: Unit On Chiller or
Circuit
Immediate
and Special
Action
NonLatch Any Ckt[s]
Energized
[No Ckt(s)
Energizd]
a) The chilled water temperature fell below the cutout setpoint
for 16.6°C-seconds while a compressor was running.
Automatic reset occurs when the temperature rises 1.1°C
above the cutout setting for 2 minutes. This diagnostic shall not
de-energize the Evaporator Water Pump Output. If this
diagnostic is active the Low Evap Leaving Water Temp: Unit Off
diagnostic shall be suppressed.
b) If evaporator protection temperature sensors are installed,
the effect is on the appropriate circuit. Else, the effect is on the
chiller. Remote
Low Refrigerant
Temperature Circuit Immediate Latch All except
[Service
Pumpdown]
The Evaporator Saturated Refrigerant Temperature dropped
below the Low Refrigerant Temperature Cutout Setpoint for
16.6°C-seconds. Local