Filter
Top Products
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
Ͼ220 F (104.4 C) Preset, alert setting configurable
BEARING TEMPERATURE Ͼ220 F (104.4 C) Preset, alert setting configurable
EVAPORATOR REFRIGERANT
TEMPERATURE
(Temp converted from Pressure
Reading)
Ͻ33 F (for water chilling) (0.6° C)
Preset, configure chilled medium for water
(Service1 table)
ϽBrine 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 Ͻ4.5 vdc Ͼ 5.5 vdc
Preset (Read voltage at terminals 34 and 35
on PSIO module)
CONDENSER PRESSURE — SWITCH
Ͼ218 ± 7 psig (1503 ± 48 kPa),
reset at 120 ± 10 (827 ± 69 kPa)
Preset
— CONTROL 215 psig (1482 kPa) Preset
COMPRESSOR OIL PRESSURE — SWITCH Cutout Ͻ11 psid (76 kPad) ± 1.5 psid (10.3 kPad)
Cut-in Ͼ16.5 psid (114 kPad) ± 4 psid (27.5 kPad)
Preset, no calibration needed
— CONTROL
Cutout Ͻ15 psid (103 kPad)
Alert Ͻ18 psid (124 kPad)
Preset
LINE VOLTAGE — HIGH Ͼ110% 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 Ͻ90% for one minute or р85% for 3 seconds
— SINGLE-CYCLE Ͻ50% for one cycle
COMPRESSOR MOTOR LOAD
(% Compressor Amps)
Ͼ110% for 30 seconds Preset
Ͻ10% with compressor running Preset
Ͼ10% with compressor off Preset
STARTER ACCELERATION TIME
(Determined by inrush current
going below 100% compressor
motor load)
Ͼ45 seconds
For chillers with reduced voltage mechanical
and solid-state starters
Ͼ10 seconds
For chillers with full voltage starters
(Configured on Service1 table)
STARTER TRANSITION Ͼ75 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 waterflow 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