Carrier 17EX Table 3 Protective Safety Limits and Control Settings

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

BEARING TEMPERATURE .220 F (104.4 C) Preset, alert setting conﬁgurable

EVAPORATOR REFRIGERANT

TEMPERATURE

(Temp converted from Pressure

Reading)

,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 (Read voltage at terminals 34 and 35

on PSIO module)

CONDENSER PRESSURE — SWITCH .218 ± 7 psig (1503 ± 48 kPa),

reset at 120 ± 10 (827 ± 69 kPa) Preset

— CONTROL 215 psig (1482 kPa) Preset

COMPRESSOR 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 voltage 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

(% Compressor Amps)

.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 mechanical

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 tem-

perature or condenser entering water temperature is below the

conﬁgured condenser freeze point temperature. Deenergizes

when the temperature is5F(3C)above condenser freeze point

temperature.

CONDENSER FREEZE POINT conﬁgured in

Service01 table with a default setting of

34F(1C).

IMPELLER CLEARANCE Displacement switch open Thrust movement excessive

MOTOR LEAK DETECTOR (TEWAC

MOTORS ONLY) Water from motor cooling is leaking Water sensors are installed only on open-drive

motors that use water cooling. (Totally enclosed,

water-to-air cooled [TEWAC] motors)

GEAR OIL TEMPERATURE

— CONTROL Cut-Out > 150 F (66 C)

Alert > 130-145 (54 - 63 C) Preset

Adjustable

GEAR OIL PRESSURE

—CONTROL Cut-out < 12 psi (83 kPa)

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

Adjustable

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.

Carrier 17EX Table 3 Protective Safety Limits and Control Settings

Table 3 — Protective Safety Limits and Control Settings

CUT-OFF

SETTING

ADJUSTMENT

SCREW

Carrier Part No. HK06ZC001

NOTE: Dimensions in parentheses are in

millimeters.

Carrier Part No. HK06ZC033