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

0.08 to 0.98 Voltage Ratio

Must be outside range for 2 seconds.

OUT OF RANGE

Ratio = Input Voltage ÷ Voltage Reference

 

COMPRESSOR DISCHARGE

.220 F (104.4 C)

Preset, alert setting con®gurable

TEMPERATURE

 

 

BEARING TEMPERATURE

.220 F (104.4 C)

Preset, alert setting con®gurable

EVAPORATOR REFRIGERANT

,33 F (for water chilling) (0.6° C)

Preset, con®gure chilled medium for water

(Service1 table)

TEMPERATURE

 

 

Con®gure chilled medium for brine (Service1

(Temp converted from Pressure

,Brine Refrigerant Trippoint (set point adjustable

Reading)

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

table). Adjust brine refrigerant trippoint for

 

 

proper cutout

TRANSDUCER VOLTAGE

,4.5 vdc . 5.5 vdc

Preset (Read voltage at terminals 34 and 35

on PSIO module)

 

 

CONDENSER PRESSURE Ð SWITCH

.218 ± 7 psig (1503 ± 48 kPa),

Preset

reset at 120 ± 10 (827 ± 69 kPa)

 

 

Ð CONTROL

215 psig (1482 kPa)

Preset

COMPRESSOR 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 voltage to

Ð LOW

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

24 vac rated-input to the Starter Management

Ð SINGLE-CYCLE

 

Module. Also monitored at PSIO power input.

,50% for one cycle

 

COMPRESSOR MOTOR LOAD

.110% for 30 seconds

Preset

,10% with compressor running

Preset

(% Compressor Amps)

.10% with compressor off

Preset

 

STARTER ACCELERATION TIME

.45 seconds

For chillers with reduced voltage mechanical

(Determined by inrush current

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 refrigerant tem-

 

CONDENSER FREEZE

perature or condenser entering water temperature is below the

CONDENSER FREEZE POINT con®gured in

con®gured condenser freeze point temperature. Deenergizes

Service01 table with a default setting of

PROTECTION

when the temperature is 5 F (3 C) above condenser freeze point

34 F (1 C).

 

 

temperature.

 

IMPELLER CLEARANCE

Displacement switch open

Thrust movement excessive

MOTOR LEAK DETECTOR (TEWAC

 

Water sensors are installed only on open-drive

Water from motor cooling is leaking

motors that use water cooling. (Totally enclosed,

MOTORS ONLY)

 

water-to-air cooled [TEWAC] motors)

 

 

GEAR OIL TEMPERATURE

Cut-Out > 150 F (66 C)

Preset

Ð CONTROL

Alert > 130-145 (54 - 63 C)

Adjustable

GEAR OIL PRESSURE

Cut-out < 12 psi (83 kPa)

Preset

ÐCONTROL

Alert < 15-20 psi (103 - 139 kPa)

Adjustable

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-OFF

SETTING

ADJUSTMENT

SCREW

Carrier Part No. HK06ZC001

NOTE: Dimensions in parentheses are in millimeters.

Carrier Part No. HK06ZC033

34

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Carrier 17EX specifications Protective Safety Limits and Control Settings

17EX specifications

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