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
MOTOR WINDING 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
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 machines with reduced voltage mechanical
and solid-state starters
.10 seconds
For machines 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 temperature
or condenser entering water temperature is below the configured con-
denser 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* 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)
Flow Switches (Field Supplied)
Operate water pumps with machine off. Manually re-
duce water flow and observe switch for proper cut-
out. Safety shutdown occurs when cutout time ex-
ceeds 3 seconds.
CUT-OFF
SETTING
ADJUSTMENT
SCREW
Carrier Part No. HK06ZC001
NOTE: Dimensions in parentheses are in
millimeters.
Carrier Part No. HK06ZC033
*Applicable to open-drive machines only.
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