39CG-SVU02C-E4
Main Processor Diagnostics
Diagnostic Name
Affects
Ta r g e t
Severity Persistence
Active Modes
[Inactive Modes]
Criteria Reset Level
Low Evaporator
Refrigerant Pressure
- Circuit 2
Circuit Immediate
Latch
Cprsr Prestart and
Cprsr Energized
a. The Evap Refrig Pressure dropped below 10 Psia just
prior to compressor start (after EXV preposition). b. For
RTUD A/C during early startup period: The Evap Refrig
Pressure fell below the Condenser Pressure ÷ 8,
limited to between 2 and 10 psia. c. For RTWD (or
RTUD, ACFC=none) during early startup period: The
Evap Refrig Pressure fell below 10 Psia. d. For all chiller
types, after early Startup Period expires: The Evap Refrig
Pressure fell below 16 Psia.
(Note: the Startup Period for RTWD is 3 min; for RTUD it
is between 1 and 5 min for as an inverse function of the
Cond Temp measured at time of circuit startup).
Local
Very Low
Evaporator
Refrigerant Pressure
- Circuit 1
Chiller Immediate
Latch
All
[compressor or circuit
in manual lockout]
The respective circuit's evaporator pressure dropped
below 80% of the current Low Evap Refrig Press Cutout
setting (see above) or 8 psia, whichever is less,
regardless of the running state of the circuit's
compressor. 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
Very Low
Evaporator
Refrigerant Pressure
- Circuit 2
Chiller Immediate
Latch
All
[compressor or circuit
in manual lockout]
The respective circuit's evaporator pressure dropped
below 80% of the current Low Evap Refrig Press Cutout
setting (see above) or 8 psia, whichever is less,
regardless of the running state of the circuit's
compressor. 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
Low Evaporator
Leaving Water Temp:
Unit Off
Evap (and
circ) Pump
Special
Action
NonLatch
Unit in Stop Mode, or
in Auto Mode and No
Ckt(s) Energzd [Any
Ckt Energzd]
The leaving Evaporator water temp. fell below the
leaving water temp cutout setting for 30 degree F
seconds while the Chiller is in the Stop mode, or in Auto
mode with no compressors running. Energize small
Evap Circulating Pump (RTUD A/C) and Evap Water
pump Relay (but only if "Evap Water Pump Diagnostic
Override" setting is enabled) until diagnostic auto resets,
then de-energize the circ pump and return to normal
evap pump control. Automatic reset occurs when the
temp rises 2°F (1.1°C) above the cutout setting for 30
minutes. This diagnostic even while active, does not
prevent operation of either circuit
Remote
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