Carrier 19XL - Manual (Page 30)

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 Ͼ 220 F (104.4 C) Preset, alert setting configurable
MOTOR WINDING TEMPERATURE Ͼ 220 F (104.4 C) Preset, alert setting configurable
BEARING TEMPERATURE Ͼ 185 F (85 C) Preset, alert setting configurable
EVAPORATOR REFRIGERANT
TEMPERATURE
Ͻ 33 F (for water chilling) (0.6° C)
Preset, configure chilled medium for
water (Service1 table)
Ͻ 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 Ͻ 4.5 vdc Ͼ 5.5 vdc Preset
CONDENSER PRESSURE — SWITCH
Ͼ 263 ± 7 psig (1813 ± 48 kPa),
reset at 180 ± 10 (1241 ± 69 kPa)
Preset
— CONTROL
Ͼ 260 psig (1793 kPa) for HCFC-22;
215 psig (1482 kPa) for HFC-134a
Preset
OIL PRESSURE — SWITCH Cutout Ͻ 11 psid (76 kPad) ± 1.5 psid (10.3 kPad)
Cut-in Ͼ 16.5 psid (114 kPad) ± 4 psid (27.5 kPad)
Preset, no calibration needed
— CONTROL
Cutout Ͻ 15 psid (103 kPad)
Alert Ͻ 18 psid (124 kPad)
Preset
LINE VOLTAGE — HIGH Ͼ 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 Ͻ 90% for one minute or р 85% for 3 seconds
— SINGLE-CYCLE Ͻ 50% for one cycle
COMPRESSOR MOTOR LOAD
Ͼ 110% for 30 seconds Preset
Ͻ 10% with compressor running Preset
Ͼ 10% with compressor off Preset
STARTER ACCELERATION TIME
(Determined by inrush current
going below 100% compressor
motor load) Ͼ 45 seconds
For chillers with reduced voltage me-
chanical and solid-state starters
Ͼ 10 seconds
For chillers with full voltage starters
(Configured on Service1 table)
STARTER TRANSITION Ͼ 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 is 5 F (3 C) 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
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