RTHD-SVX01L-EN
79
Table 23. Main processor diagnostics (continued)
Diagnostic Name
Affects
Target
Severity
Persistence
Active Modes
[Inactive Modes]
Criteria
Reset
Level
Low Evaporator
Refrigerant
Temperature
Chiller Immediate Latch
All Ckt Running
Modes
a. The inferred Saturated Evap Refrigerant Temperature
dropped below the Low Refrigerant Temperature Cutout
Setpoint for 450°F-sec 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.
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
Low Evaporator
Temp: Unit Off
Chiller
Warning
and Special
Action
NonLatch
Unit in Stop Mode,
or in Auto Mode and
No Ckt's Energizd
[Any Ckt Energizd]
The evap sat temp fell below the water temp cutout setting
while the respective evap liquid level was greater than –
21.2mm for 30°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
Low Evaporator
Water Flow
Chiller
Warning NonLatching
Chiller Auto, manual
water pump and All
Running Modes
a. The evap. water flow measurement option was installed
and the flow dropped to or below the Evaporator Low Water
Flow Warning Setpoint in TV. This IFW shall be Auto Reset
and reset 0.1 gpm/ton above the adjustable trip point or
when the Evaporator water pump is turned off.
b. See Water Flow and Tons Sensing specification for
additional information.
Remote
Low Evaporator
Water Temp (Unit
Off)
Chiller
Warning
and Special
Action
NonLatch
Unit in Stop Mode,
or in Auto Mode and
No Ckt(s) Energized
[Any Ckt Energized]
The leaving Evaporator water temp. fell below the leaving
water temp cutout setting for 30 °F seconds while the
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 the temp rises
2°F (1.1°C) above the cutout setting for 30 minutes.
Remote
Low Evaporator
Water Temp (Unit
On)
Chiller
Immediate
and Special
Action
NonLatch
Any Ckt[s]
Energized [No Ckt
(s) Energizd]
The Evaporator water temp. fell below the cutout setpoint
for 30 degree F Seconds while the compressor was
running. Automatic reset occurs when the temperature rises
2 °F (1.1°C) above the cutout setting for 2 minutes. This
diagnostic shall not de-energize the Evaporator Water
Pump Output.
Remote
Low Oil Flow Chiller Immediate Latch
Chiller Energized
and Delta P above
15 Psid
The oil pressure was out of the acceptable pressure range
for 15 seconds, while the Delta Pressure was greater than
15 Psid.: Acceptable range is 0.50 or 0.60 > (P
C
-P
o
) / (P
C
-
P
E
) for the first 2.5 minutes of operation, and 0.40 or 0.50 >
(P
C
-P
o
) / (P
C
-P
E
) thereafter. The higher ratios used if the
system DP is less than 23 psid
Local
MP: Invalid
Configuration
Platform Immediate Latch All
MP has an invalid configuration based on the current
software installed
Remote
MP: Reset Has
Occurred
Chiller
Warning
NonLatch All
The main processor has successfully come out of a reset
and built its application. A reset may have been due to a
power up, installing new software or configuration. This
diagnostic is immediately and automatically cleared and
thus can only be seen in the Historic Diagnostic List in
Tracer TU.
Remote
Diagnostics
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