Table 3 — Protective Safety Limits and Control Settings
MONITORED PARAMETER LIMIT APPLICABLE COMMENTS
TEMPERATURE SENSORS OUT OF
RANGE
–40 to 245 F (–40 to 118.3 C) Must be outside range for 2 seconds
PRESSURE TRANSDUCERS OUT OF
RANGE
0.06 to 0.98 Voltage Ratio Must be outside range for 3 seconds.
Ratio = Input Voltage ÷ Voltage Reference
COMPRESSOR DISCHARGE
TEMPERATURE
.220 F (104.4 C) Preset, alert setting configurable
MOTOR WINDING TEMPERATURE .220 F (104.4 C) Preset, alert setting configurable
BEARING TEMPERATURE .185 F (85 C) Preset, alert setting configurable
EVAPORATOR REFRIGERANT
TEMPERATURE
,33 F (for water chilling) (0.6° C) Preset, configure chilled medium for water
(SETUP1 table)
,EVAP REFRIG TRIPPOINT (set point
adjustable from 0 to 40 F [–18 to 4 C] for
brine chilling)
Configure chilled medium for brine (SETUP1
table). Adjust
EVAP REFRIG TRIPPOINT
for
proper cutout
TRANSDUCER VOLTAGE ,4.5 vdc . 5.5 vdc Preset
CONDENSER PRESSURE — SWITCH .263 ± 7 psig (1813 ± 48 kPa), reset at
180 ± 10 (1241 ± 69 kPa)
Preset
— CONTROL 165 psig (1138 kPa) Preset
OIL PRESSURE Cutout ,15 psid (103 kPad)
Alert ,18 psid (124 kPad)
Preset
LINE VOLTAGE — HIGH .110% for one minute Preset, based on transformed line voltage to
ISM. Also monitored at CVC and CCM power
input.
— LOW ,90% for one minute or <85% for 3 seconds
— SINGLE-CYCLE ,50% for one cycle
COMPRESSOR MOTOR LOAD .110% for 30 seconds Preset
,15% with compressor running Preset
.15% with compressor off Preset
STARTER ACCELERATION TIME
(Determined by inrush current
going below 100% compressor
motor load)
.45 seconds For chillers with reduced voltage mechanical
and solid-state starters
.10 seconds For chillers with full voltage starters
(Configured on ISM_CONFIG table)
STARTER TRANSITION .75 seconds Reduced voltage starters only
CONDENSER FREEZE PROTECTION Energizes condenser pump relay if condenser
refrigerant temperature or condenser entering
water temperature is below the configured
condenser freeze point temperature. Deener-
gizes when the temperature is5F(3C)
above condenser freeze point temperature.
CONDENSER FREEZE POINT
configured in
SETUP1 table with a default setting of
34F(1C).
DISCHARGE SUPERHEAT Minimum value calculated based on
operating conditions and then compared
to actual superheat.
Calculated minimum required superheat and
actual superheat are shown on OVERRIDE
screen.
VARIABLE DIFFUSER OPERATION Detects discharge pulses caused by incorrect
diffuser position.
Preset, no calibration needed.
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