Trane Ascend ACR Series Installation, Operation And Maintenance Manual page 93

Table 27. Diagnostics — main processor (continued)
Affects
Diagnostic
Target
Name
Low
Differential
Circuit
Rfgt Pressure -
Ckt1
Low
Differential
Circuit
Rfgt Pressure -
Ckt2
Low Discharge
Superheat – Circuit
Ckt1
Low Discharge
Superheat – Circuit
Ckt2
Low Drive
Cooling Supply
Circuit
Temp – Ckt1
Low Drive
Cooling Supply
Circuit
Temp – Ckt2
Low
Evaporator
Circuit
Rfgt Pressure -
Ckt1
AC-SVX001A-EN
Severity
Persistence
Immediate Latch
Immediate Latch
Normal Latch
Normal Latch
Info NonLatch
Info NonLatch
Immediate Latch
Active
Modes
[Inactive
Modes]
The system differential pressure (Pc-Pe) for the
respective circuit was below 15 psid (240.5 kPa) or
the pressure ratio (Pc/Pe) was less than 1.1 while the
Cprsr
compressor is running for a period of time dependent
Energized
on the deficit (15 sec ignore time from circuit start)
Refer to the Oil Flow Protection specification for the
The system differential pressure (Pc-Pe) for the
respective circuit was below 15psid (240.5 kPa) or
the pressure ratio (Pc/Pe) was less than 1.1 while the
Cprsr
compressor is running for a period of time dependent
Energized
on the deficit (15 sec ignore time from circuit start)
Refer to the Oil Flow Protection specification for the
While Running Normally, the Discharge Superheat
was less than 9 degrees F for more than 4878 degree
Any Running
F seconds. At circuit startup, the Discharge
Mode
Superheat will be ignored for 5 minutes
While Running Normally, the Discharge Superheat
was less than 9 degrees F for more than 4878 degree
Any Running
F seconds. At circuit startup, the Discharge
Mode
Superheat will be ignored for 5 minutes
The Drive Cooling Supply temperature for the
respective circuit is seen to be more than 5F cooler
than its setpoint for more than 30 minutes. Auto-
All Ckt Running
reset if temperatures return to Undesirable
Modes
condensation is possible on the cooled surfaces
inside the control panel. Inspect the Drive Cooling
System components for misoperation or failure
The Drive Cooling Supply Temperature for the
respective circuit is seen to be more than 5F cooler
than its setpoint for more than 30 minutes.
All Ckt Running
Undesirable condensation is possible on the cooled
Modes
surfaces inside the control panel. Inspect the Drive
Cooling System components for misoperation or
a. The Evap Refrig Pressure dropped below 10 Psia
just prior to compressor start (after EXV
preposition). b. During Early Startup Period: the
Evap Refrig Pressure fell below a pressure equal to
Cprsr Prestart Condenser Pressure ÷ 8 but as limited to not less
and Cprsr than 6 or greater than 10 psia. c. After Early Startup
Energized Period expires: The Evap Refrig Pressure fell below
16 Psia for 30 seconds or below 10 psia for 5
seconds. (Note: the Early Startup Period for RTAE it
is between 1 and 5 min as an inverse function of the
Cond Temp measured at time of circuit startup)
D D i i a a g g n n o o s s t t i i c c s s
Criteria
time to trip function.
time to trip function.
failure
Reset
Level
Remote
Remote
Remote
Remote
Local
93