Carrier 19XL Table 3 Protective Safety Limits and Control Settings

Table 3 — Protective Safety Limits and Control Settings

MONITORED PARAMETER LIMIT APPLICABLECOMMENTS

TEMPERATURESENSORS

OUT OF RANGE –40 to 245 F (–40 to 118.3C) Must be outside range for 2 seconds

PRESSURE TRANSDUCERS

OUT OF RANGE 0.08 to 0.98 VoltageRatio Must be outside range for 2 seconds.

Ratio = Input Voltage÷ Voltage

Reference

COMPRESSOR DISCHARGE

TEMPERATURE .220F (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

EVAPORATORREFRIGERANT

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 ,11psid (76 kPad) ± 1.5 psid (10.3 kPad)

Cut-in .16.5 psid (114kPad) ± 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

STARTERACCELERATION 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)

STARTERTRANSITION .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)abovecon-

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

reducewater ﬂow and observe switch for proper

cutout.Safety shutdown occurs when cutout time

exceeds 3 seconds.

CUT-OUT

SETTING

ADJUSTMENT

SCREW