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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
0.08 to 0.98 Voltage Ratio
Must be outside range for 2 seconds.
Ratio = Input Voltage ÷ Voltage
Reference
COMPRESSOR DISCHARGE
TEMPERATURE
Ͼ220 F (104.4 C) Preset, alert setting configurable
MOTOR WINDING TEMPERATURE Ͼ220 F (104.4 C) Preset, alert setting configurable
BEARING TEMPERATURE Ͼ185 F (85 C) Preset, alert setting configurable
EVAPORATOR REFRIGERANT
TEMPERATURE
Ͻ33 F (for water chilling) (0.6° C)
Preset, configure chilled medium for
water (Service1 table)
ϽBrine Refrigerant Trippoint (set point adjustable
from 0 to 40 F [–18 to 4 C] for brine chilling)
Configure chilled medium for brine
(Service1 table). Adjust brine refrigerant
trippoint for proper cutout
TRANSDUCER VOLTAGE Ͻ4.5 vdc Ͼ 5.5 vdc Preset
CONDENSER PRESSURE — SWITCH
Ͼ263 ± 7 psig (1813 ± 48 kPa),
reset at 180 ± 10 (1241 ± 69 kPa)
Preset
— CONTROL
Ͼ260 psig (1793 kPa) for HCFC-22;
215 psig (1482 kPa) for HFC-134a
Preset
OIL PRESSURE — SWITCH Cutout Ͻ11 psid (76 kPad) ± 1.5 psid (10.3 kPad)
Cut-in Ͼ16.5 psid (114 kPad) ± 4 psid (27.5 kPad)
Preset, no calibration needed
— CONTROL
Cutout Ͻ15 psid (103 kPad)
Alert Ͻ18 psid (124 kPad)
Preset
LINE VOLTAGE — HIGH Ͼ110% for one minute
Preset, based on transformed line volt-
age to 24 vac rated-input to the Starter
Management Module. Also monitored at
PSIO power input.
— LOW Ͻ90% for one minute or р85% for 3 seconds
— SINGLE-CYCLE Ͻ50% for one cycle
COMPRESSOR MOTOR LOAD
Ͼ110% for 30 seconds Preset
Ͻ10% with compressor running Preset
Ͼ10% with compressor off Preset
STARTER ACCELERATION TIME
(Determined by inrush current
going below 100% compressor
motor load)
Ͼ45 seconds
For chillers with reduced voltage me-
chanical and solid-state starters
Ͼ10 seconds
For chillers with full voltage starters
(Configured on Service1 table)
STARTER TRANSITION Ͼ75 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 con-
denser freeze point temperature. Deenergizes
when the temperature is5F(3C)above con-
denser freeze point temperature.
CONDENSER FREEZE POINT config-
ured in Service01 table with a default
setting of 34 F (1 C).
Flow Switches (Field Supplied)
Operate water pumps with chiller off. Manually
reduce water flow and observe switch for proper
cutout. Safetyshutdown occurswhen cutouttime
exceeds 3 seconds.
CUT-OUT
SETTING
ADJUSTMENT
SCREW
30