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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 Refer-
ence
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
>220 F (104.4 C) Preset; alert setting configurable
Evaporator Refrigerant
Temperature (Temp
converted from Pressure
Reading)
<33 F (for water chilling) (0.6° C) Preset; configure chilled medium for
water (Service1 table)
<Brine 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
<4.5 vdc > 5.5 vdc Preset (Read voltage at terminals 34
and 35 on PSIO module)
Condenser Pressure – Switch
– Control
>218 psig ± 7 psig (1503 ± 48 kPa),
reset at 120 ± 10 (827 ± 69 kPa)
Preset
215 psig (1482 kPa) Preset
Oil Pressure
– Switch
– Control
Cutout <11 psid (76 kPad) ± 1.5 psid
(10.3 kPad) Cut-in > 16.5 psid (114
kPad) ± 4 psid (27.5 kPad)
Preset, no calibration needed
Cutout < 15 psid (103 kPad)
Alert < 18 psid (124 kPad)
Preset
Line Voltage —
High
—
Low
—
Single-cycle
>110% 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.
<90% for one minute and ≤85% for 3
seconds
<50% for one cycle
Compressor Motor Load
(% Compressor Amps)
>110% for 30 seconds Preset
<10% with compressor running Preset
>10% with compressor off Preset