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136 RTAC-SVX01F-EN
Diagnostics
D8 Under Voltage Normal NonLatch a. Line voltage below - 10% of nominal or the Under/Overvoltage
transformer is not connected. [Must hold = - 10 % of nominal. Must
trip = - 15 % of nominal. Reset differential = min. of 2% and max. of
4%. Time to trip = min. of 1 min. and max. of 5 min.) Design: Nom.
trip: 60 seconds at less than 87.5%, + or - 2.8% at 200V or + or - 1.8%
at 575V, Auto Reset at 90% or greater.
Remote
771 Very Low Evaporator
Refrigerant Pressure -
Circuit 1
Immediate Latch The evaporator pressure dropped below 10 psia (or 5 psia in software
prior to Oct '02)regardless of whether or not compressors are running
on that circuit. This diagnostic was created to prevent compressor
failures due to crossbinding by forcing an entire chiller shutdown. If a
given compressor or circuit is locked out, the suction pressure
transducer(s)associated with it, will be excluded from causing this
diagnostic.
Local
772 Very Low Evaporator
Refrigerant Pressure -
Circuit 2
Immediate Latch Same as Very Low Evaporator Refrigerant Pressure - Circuit 1 Local
Hex
Code
Diagnostic Name
and Source
Severity Persis-
tence
Criteria Reset
Level