Specifications

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Table 6 — Protective Safety Limits and Control Settings
MONITORED PARAMETER STATE LIMIT COMMENTS
Temperature Sensors Out of
Range
260-270,
272,140,
141
Temperature <-40 deg F or >245 deg F for
3 seconds
Preset Alarm
Pressure Transducers Out of
Range
260-270
.06>Voltage Ratio>.98 for 3 seconds, Valid Range
is > -6.7 PSI and < 420 PSI
Preset Alarm, Voltage Ratio=Input Voltage/
Voltage Reference (5 Volts)
Compressor Discharge
Temperature
231
COMP DISCHARGE TEMP > 220 deg F
(104.4 deg C)
Preset Alarm,
149
COMP DISCHARGE TEMP > COMP DISCHARGE
ALERT
Configure COMP DISCHARGE ALERT in
SETUP1 screen
103
COMP DISCHARGE TEMP > COMP DISCHARGE
ALERT - 10 deg F(5.6 deg C)
Prestart Alert, Configure COMP DIS-
CHARGE ALERT in SETUP1 screen
Motor Winding Temperature 233
COMP MOTOR WINDING TEMP > 220 deg F
(104 deg C)
Preset Alarm, Configure COMP MOTOR
TEMP OVERRIDE in SETUP1 screen
Motor Winding Temperature 102
COMP MOTOR WINDING TEMP > COMP
MOTOR TEMP OVERRIDE - 10 deg F (5.6 deg C)
Prestart Alert, Configure COMP MOTOR
TEMP OVERRIDE in SETUP1 screen
Compressor Thrust Bearing
Temperature
101
COMP THRUST BRG TEMP > COMP THRUST
BRG ALERT - 10 deg F (5.6 deg C)
Prestart Alert, Configure COMP THRUST
BRG ALERT in SETUP1 screen
Compressor Thrust Bearing
Temperature
150
COMP THRUST BRG TEMP > COMP THRUST
BRG ALERT
Configure COMP THRUST BRG ALERT in
SETUP1 screen (rolling element bearings
have higher normal operating temperature
but within limit)
Compressor Thrust Bearing
Temperature
234
COMP THRUST BRG TEMP > COMP THRUST
BRG TRIP
Configure COMP THRUST BEARING
RESET FACTOR (default = 1.4). Trip point
varied by THRUST BEARING RESET. See
PIC II Functions > COMPRESSOR BEAR-
ING TEMPERATURE.
Low Refrigerant Temperature
(Freeze Protection)
243
Chiller in RECYCLE SHUTDOWN and [CALC
EVAP SAT TEMP or EVAP REFRIG LIQUID TEMP]
< EVAP REFRIG TRIPPOINT + 1 deg F
Preset Alarm, configure EVAP REFRIG
TRIPPOINT in SETUP1 screen
232
Water chilling: EVAP REFRIG TEMP < 33 deg F
Brine Chilling: EVAP REFRIG TEMP<0-40 deg F
(configurable) and EVAP APPROACH > EVAP
APPROACH ALERT
Preset Alarm, Configure EVAP
APPROACH ALERT, EVAP REFRIG TRIP
POINT and CHILLED MEDIUM in SETUP1
screen
104
Water Chilling: CALC EVAP SAT TEMP or EVAP
REFRIG LIQUID TEMP < 33 deg F + REFRIG
OVERRIDE DELTA T
Brine Chilling
: CALC EVAP SAT TEMP or EVAP
REFRIG LIQUID TEMP < EVAP REFRIG TRIP-
POINT
Prestart Alert, Configure REFRIG OVER-
RIDE DELTA T, EVAP REFRIG TRIP-
POINT and CHILLED MEDIUM in SETUP1
screen
Transducer Voltage Fault 239 Voltage Reference < 4.5 VDC or > 5.5 VDC Preset Alarm
High Condenser Pressure -
Control
235 CONDENSER PRESSURE > 165 PSI
Preset Alarm, Configure COND PRESS
OVERRIDE in SETUP1 screen
High Condenser Pressure -
Prestart
106
CONDENSER PRESSURE > COND PRESS
OVERRIDE - 20 PSI or CONDENSER PRESSURE
> 145 PSI
Prestart Alert, Configure COND PRESS
OVERRIDE in SETUP1 screen. Causes
condenser pump to start and remain on
through startup.
Low Discharge Superheat 240
DISCHARGE SUPERHEAT < SUPERHEAT
REQUIRED - 3 deg F(1.7 deg C) for 60 seconds.
SUPERHEAT REQUIRED is calculated for current
conditions.
Preset Alarm, DISCHARGE SUPERHEAT
= COMP DISCHARGE TEMP - CON-
DENSER REFRIG TEMP
Condenser High Pressure Switch
Circuit
207
High Pressure Switch Circuit Open and START =
YES and CONDENSER PRESSURE > 160 PSI
Preset Alarm, High Pressure Switch resets
at 110 +/-7 PSIG
224
High Pressure Switch Circuit Open, START = YES
and CONDENSER PRESSURE < 160 PSI
Preset Alarm, High Pressure Switch resets
at 110 +/-7 PSIG
235 CONDENSER PRESSURE >165 PRESET ALARM
Low Condenser Pressure (Freeze
Protection)
244
Energizes condenser pump relay if Chiller in
PUMPDOWN mode and CONDENSER REFRIG
TEMP < CONDENSER FREEZE POINT
De-energizes
condenser pump relay when [CON-
DENSER REFRIG TEMP > CONDENSER
FREEZE POINT + 5 deg F (2.8 deg C)] and
[ENTERING COND LIQUID > CONDENSER
FREEZE POINT]
Preset Alarm, Configure CONDENSER
FREEZE POINT in SETUP1 screen.
154
Energizes condenser pump relay if CONDENSER
REFRIG TEMP < CONDENSER FREEZE POINT.
De-energizes
condenser pump relay when [CON-
DENSER REFRIG TEMP > CONDENSER
FREEZE POINT + 5 deg F (2.8 deg C)] and
[ENTERING COND LIQUID > CONDENSER
FREEZE POINT]
Preset Alarm, Configure CONDENSER
FREEZE POINT in SETUP1 screen.
Oil - Low Pressure 228
[OIL PRESSURE DELTA P < 18 PSID and START
= TRUE] or [ OIL PRESSURE DELTA P < 15 PSID
and startup complete after OIL PRESS VERIFY
TIME elapsed]
Preset Alarm, Configure OIL PRESS VER-
IFY TIME in SETUP1 screen

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