Table 3 Ð Protective Safety Limits and Control Settings

MONITORED PARAMETER

LIMIT

APPLICABLE COMMENTS

TEMPERATURE SENSORS

±40 to 245 F (±40 to 118.3 C)

Must be outside range for 2 seconds

OUT OF RANGE

 

 

PRESSURE TRANSDUCERS

 

Must be outside range for 2 seconds.

0.08 to 0.98 Voltage Ratio

Ratio = Input Voltage ÷ Voltage

OUT OF RANGE

 

Reference

 

 

COMPRESSOR DISCHARGE

.220 F (104.4 C)

Preset, alert setting con®gurable

TEMPERATURE

 

 

MOTOR WINDING TEMPERATURE

.220 F (104.4 C)

Preset, alert setting con®gurable

BEARING TEMPERATURE

.185 F (85 C)

Preset, alert setting con®gurable

 

,33 F (for water chilling) (0.6° C)

Preset, con®gure chilled medium for

EVAPORATOR REFRIGERANT

water (Service1 table)

 

 

Con®gure chilled medium for brine

TEMPERATURE

,Brine Refrigerant Trippoint (set point adjustable

(Service1 table). Adjust brine refrigerant

 

from 0 to 40 F [±18 to 4 C] for brine chilling)

 

trippoint for proper cutout

 

 

TRANSDUCER VOLTAGE

,4.5 vdc . 5.5 vdc

Preset

CONDENSER PRESSURE Ð SWITCH

.263 ± 7 psig (1813 ± 48 kPa),

Preset

reset at 180 ± 10 (1241 ± 69 kPa)

 

 

Ð CONTROL

.260 psig (1793 kPa) for HCFC-22;

Preset

215 psig (1482 kPa) for HFC-134a

 

 

OIL PRESSURE Ð SWITCH

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

Preset, no calibration needed

 

Cut-in .16.5 psid (114 kPad) ± 4 psid (27.5 kPad)

 

 

Ð CONTROL

Cutout ,15 psid (103 kPad)

Preset

Alert ,18 psid (124 kPad)

 

 

LINE VOLTAGE Ð HIGH

.110% for one minute

Preset, based on transformed line volt-

Ð LOW

 

age to 24 vac rated-input to the Starter

,90% for one minute or <85% for 3 seconds

Management Module. Also monitored at

Ð SINGLE-CYCLE

,50% for one cycle

PSIO power input.

 

.110% for 30 seconds

Preset

COMPRESSOR MOTOR LOAD

,10% with compressor running

Preset

 

.10% with compressor off

Preset

STARTER ACCELERATION TIME

.45 seconds

For chillers with reduced voltage me-

(Determined by inrush current

chanical and solid-state starters

 

going below 100% compressor

.10 seconds

For chillers with full voltage starters

motor load)

(Con®gured on Service1 table)

STARTER TRANSITION

.75 seconds

Reduced voltage starters only

 

Energizes condenser pump relay if condenser

 

CONDENSER FREEZE

refrigerant temperature or condenser entering

CONDENSER FREEZE POINT con®g-

water temperature is below the con®gured con-

ured in Service01 table with a default

PROTECTION

denser freeze point temperature. Deenergizes

setting of 34 F (1 C).

 

when the temperature is 5 F (3 C) above con-

 

 

 

denser freeze point temperature.

 

 

 

 

Flow Switches (Field Supplied)

Operate water pumps with chiller off. Manually reduce water ¯ow and observe switch for proper cutout. Safety shutdown occurs when cutout time exceeds 3 seconds.

CUT-OUT

SETTING

ADJUSTMENT

SCREW

30

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Carrier 19XL specifications Protective Safety Limits and Control Settings

19XL specifications

The Carrier 19XL is a highly regarded commercial heating and cooling solution, designed to provide optimum performance and energy efficiency in various applications. This rooftop unit is engineered to meet the diverse needs of businesses, making it an ideal choice for those requiring reliable climate control in their facilities.

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