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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 Tem-
perature
>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 (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
Condenser Pressure — Switch
— Control
>263 ± 7 psig (1813 ± 48 kPa), reset
at 180 ± 10 (1241 ± 69 kPa)
Preset
>260 psig (1793 kPa) for HCFC-22;
215 psig (1482 kPa) for HFC-134a
Preset
Oil Pressure — Switch
— Control
Cutout <11 psid (76 kPad) ± 1.5 psd
(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 or <
85% for 3
seconds
<50% for one cycle
Compressor Motor Load
>110% for 30 seconds Preset
<10% with compressor running Preset
>10% with compressor off Preset