Trane Sintesis RTAF Installation, Operation And Maintenance Manual page 76

Diagnostics
Table 27. Main processor diagnostics (continued)
Diagnostic Affects
Name Target Severity Persistence
Low Differential
Refrigerant
Pressure - xy
Low Differential
Cprsr Immediate Latch
RfgtPressure -
xy
Low Diff Rfgt
Press - xy
Low Discharge
Cprsr Normal
Superheat - xy
Low Evaporator
Temp: Circuit 1:
Unit Off
Low Evaporator Evap Special
Temp: Ckt 1: Pump Action
Unit Off
Low Evap Temp:
Unit Off
Low Evaporator
Temp: Circuit 2:
Unit Off
Low Evaporator Evap Special
Temp: Ckt 2: Pump Action
Unit Off
Low Evap Temp:
Unit Off
Evap
Pump
Low Evaporator
and
Water Temp
Freeze Special
(Unit Off)
Avoidanc Action
Low Evap Water
e
Temp-Unit Off
Request
Relay
Low Evaporator
Water Temp Immediate
(Unit On) Chiller and Special
Low Evap Water Action
Temp-Unit On
Low Oil Flow - xy Cprsr Immediate Latch
Low Refrigerant
Circuit Immediate Latch
Temperature
76
Active
Modes
[Inactive
Modes] Criteria
The system differential pressure for the respective circuit was below the
greater of 25 psid (240.5 kPa) or the pressure ratio listed in the table
Cprsr in GP2 Compressor Type FSpec while the compressor is running for a
Energized period of time dependent on the deficit (15 sec ignore time from circuit
start) – refer to the Oil Flow Protection specification for the time to trip
function.
While Running Normally, the Discharge Superheat was less than the
Any Running Low Discharge Superheat Setpoint for more than 6500 degree F
Latch
Mode seconds. At circuit startup, the Discharge Superheat will be ignored for
5 minutes.
The respective circuit's LERTC Integral was seen to be higher than ½
of its trip value (1,125°F-sec) while the chiller is in the Stop mode, or
in Auto mode with no compressors running for at least one minute. The
Unit in Stop LERTC integral is increased if the Evap Refrigerant Pool Temp is below
Mode, or in the value of the Low Evap Rfgt Temp Cutout +4°F. Energize Evap Water
Auto Mode Pump and Off-Cycle Freeze Avoidance Request Relay until diagnostic
NonLatch
and No Ckt's auto resets, then return to normal evap pump control and de-energize
Energzd [Any the Freeze Avoidance Request. Automatic reset occurs when the
Ckt Energzd] respective Evap Rfgt Pool Temp rises 2°F (1.1°C) above the LERTC
cutout setting and the Chiller Off LERTC Integral is less than 1/3 of its
trip value. This diagnostic even while active, does not prevent operation
of either circuit.
The respective circuit's LERTC Integral was seen to be higher than ½
of its trip value (1,125°F-sec) while the chiller is in the Stop mode, or
in Auto mode with no compressors running for at least one minute. The
Unit in Stop LERTC integral is increased if the Evap Refrigerant Pool Temp is below
Mode, or in the value of the Low Evap Rfgt Temp Cutout +4°F. Energize Evap Water
Auto Mode Pump and Off-Cycle Freeze Avoidance Request Relay until diagnostic
NonLatch
and No Ckt's auto resets, then return to normal evap pump control and de-energize
Energzd [Any the Freeze Avoidance Request. Automatic reset occurs when the
Ckt Energzd] respective Evap Rfgt Pool Temp rises 2°F (1.1°C) above the LERTC
cutout setting and the Chiller Off LERTC Integral is less than 1/3 of its
trip value. This diagnostic even while active, does not prevent operation
of either circuit.
Either the entering or leaving evaporator water temp. fell below the
leaving water temp cutout setting for 30 degree F seconds while the
Unit in Stop
Chiller is in the Stop mode, or in Auto mode with no compressors
Mode, or in
running. Energize Freeze Avoidance Request Relay and Evap Water
Auto Mode
NonLatch Pump Relay until diagnostic auto resets, then de-energize the Freeze
and No Ckt(s)
Avoidance Request Relay and return to normal evap pump control.
Energzd [Any
Automatic reset occurs when both temps rise 2°F (1.1°C) above the
Ckt Energzd]
cutout setting for 5 minutes, or either circuit starts. This diagnostic
even while active, does not prevent operation of either circuit.
The evaporator entering or leaving water temperature fell below cutout
Any Ckt[s]
setpoint for 30 degree F Seconds while the compressor was running.
Energzd [No
NonLatch Automatic reset occurs when both of the temperature rises 2°F (1.1°C)
Ckt(s)
above the cutout setting for 2 minutes. This diagnostic shall not de-
Energzd]
energize the Evaporator Water Pump Output.
The intermediate oil pressure sensor for this compressor was out of the
Cprsr
acceptable pressure range for 15 seconds, while the Delta Pressure was
Energized and
greater than 15 Psid (172.4 kPa).: Acceptable range is 0.50 > (PC-PI)
Delta P above
/ (PC-PE) for the first 2.5 minutes of operation, and 0.28 > (PC-PI) /
15 Psid
(PC-PE) thereafter.
The respective Evaporator Refrigerant Pool Temperature dropped below
the Low Refrigerant Temperature Cutout Setpoint for 2250°F-sec
All Ckt (12°F-sec max rate for early circuit startup period) while the circuit was
Running running. The minimum LRTC setpoint is -5°F (18.7 Psia) the point at
Modes which oil separates from the refrigerant. The integral is held nonvolatile
though power down, is continuously calculated, and can decay or build
during the circuit off cycle as conditions warrant.
Reset
Level
Remote
Remote
Remote
Remote
Remote
Remote
Local
Remote
RTAF-SVX001A-EN