Refrigerator User Manual

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
.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
.263 ± 7 psig (1813 ± 48 kPa),
reset at 180 ± 10 (1241 ± 69 kPa)
Preset
— CONTROL
.260 psig (1793 kPa) for HCFC-22;
215 psig (1482 kPa) for HFC-134a
Preset
OIL PRESSURE — SWITCH 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
— CONTROL
Cutout ,15 psid (103 kPad)
Alert ,18 psid (124 kPad)
Preset
LINE VOLTAGE — HIGH .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.
— LOW ,90% for one minute or <85% for 3 seconds
— SINGLE-CYCLE ,50% for one cycle
COMPRESSOR MOTOR LOAD
.110% for 30 seconds Preset
,10% with compressor running Preset
.10% with compressor off Preset
STARTER ACCELERATION TIME
(Determined by inrush current
going below 100% compressor
motor load)
.45 seconds
For chillers with reduced voltage me-
chanical and solid-state starters
.10 seconds
For chillers with full voltage starters
(Configured on Service1 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 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. Safety shutdown occurs when cutout time
exceeds 3 seconds.
CUT-OUT
SETTING
ADJUSTMENT
SCREW
30