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 is 5 F (3 C) above condenser freeze point
temperature.
CONDENSER FREEZE POINT configured in
Service01 table with a default setting of
34 F (1 C).
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.
CUT-OFF
SETTING
ADJUSTMENT
SCREW
Carrier Part No. HK06ZC001
NOTE: Dimensions in parentheses are in
millimeters.
Carrier Part No. HK06ZC033
34
