Trane RTHD

RTHD-SVX01D-EN 153
Diagnostics
583 Low Evaporator
Liquid Level
Info NonLatch The liquid level sensor is seen to be at or near its low
end of range for 80 contiguous minutes while the
compressor is running. Design: 20% or less of bit
count corresponding to -21.2 mm or less liquid level
for 80 minutes)
Remote
B5 Low Evaporator
Refrigerant
Pressure
Immediate Latch The Evaporator Refrigerant Pressure dropped below
10 psia just prior to compressor start. The pressure
fell below 10 psia while running but before the 1
minute ignore time had expired or fell below 16 Psia
after the 1 minute ignore time had expired.
Local
FB Low Evaporator
Refrigerant
Temperature
Immediate Latch a. The inferred Saturated Evap Refrigerant Temper-
ature (calculated from suction pressure trans-
ducer(s)) dropped below the Low Refrigerant
Temperature Cutout Setpoint for 450°F-sec (10°F-
sec max rate) while the circuit was running after the
ignore period had expired. The integral is held at
zero for the 1 minute ignore time following the
circuit startup and the integral will be limited to
never trip in less than 45 seconds, i.e. the error term
shall be clamped to 10°F. The minimum LRTC
setpoint is -5°F (18.7 Psia) the point at which oil
separates from the refrigerant. b. During the
timeout of the trip integral, the unload solenoid(s) of
the running compressors on the circuit, shall be
energized continuously and the load solenoid shall
be off. Normal load/unload operation will be
resumed if the trip integral is reset by return to
temps above the cutout setpoint.
Remote
6B3 Low Evaporator
Temp: Unit Off
Info and
Special
Action
NonLatch The evap sat temp fell below the water temp cutout
setting while the respective evap liquid level was
greater than -21.2mm for 30 degree F seconds while
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 either the evap temp rises 2°F (1.1°C) above
the cutout setting or the liquid level falls below -
21.2mm for 30 minutes
Remote
198 Low Oil Flow Immediate Latch The oil pressure was out of the acceptable pressure
range for 15 seconds, while the Delta Pressure was
greater than 23.8 Psid.: Acceptable range is 0.50 >
(PC-Po) / (PC-PE) for the first 2.5 minutes of
operation, and 0.40 > (PC-Po) / (PC-PE) thereafter,
Local
E2 Momentary
Power Loss
Immediate Nonlatch Momentary Power Loss option disabled: No effect.
Momentary Power Loss option enabled: A loss of
power on three line cycles or more was detected.
Diagnostic is reset in 30 seconds. See Momentary
Power Loss Protection specification for additional
information.
Remote
Table 33 Diagnostic List
Hex
Code
Diagnostic
Name and
Source Severity Persistence Criteria
Reset
Level