Carrier 23XL Dokumentacja Pobierz pdf (Strona 30)

Table 4 — Protective 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 3 seconds

PRESSURE TRANSDUCERS

OUT OF RANGE

0.06 to 0.98 Voltage Ratio

Must be outside range for 3 seconds.

Ratio = Input Voltage ÷ Voltage Reference

COMPRESSOR DISCHARGE

TEMPERATURE

.200 F (93 C) Preset; alert setting conﬁgurable

LOW DISCHARGE SUPERHEAT

Oil sump temp −condenser refrigerant temp is less

than 20 F (11.1 C). Only applicable to Frame 1 and 2 machines.

Preset monitored 30 minutes after start-up

completion must be outside range for

10 consecutive minutes.

CONDENSER FREEZE PROTECTION

Energizes condenser pump relay if condenser refrigerant

temperature 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 34 F (1 C).

MOTOR WINDING TEMPERATURE .220 F (104.4 C) Preset; alert setting conﬁgurable

PHASE REVERSAL

(MOTOR ROTATION)

,Start-up condenser pressure - 5 psi (34.5 kPa)

Preset; must be outside range for 3 seconds

monitored after compressor motor current . 10%

EVAPORATOR REFRIGERANT

TEMPERATURE

,33 F (0.6 C) for water chilling

Preset; conﬁgure chilled medium for water

(Service1 table)

,1° F below Design Refrigerant Temperature

(set point adjustable from 8 to 40 F [−13 to 4 C]

for brine chilling)

Conﬁgure chilled medium for brine (Service1

screen). Adjust brine refrigerant trippoint for

proper cutout

TRANSDUCER VOLTAGE ,4.5 vdc, . 5.5 vdc Preset

CONDENSER PRESSURE .260 psig (1793 kPa) Preset; alert setting conﬁgurable

OIL PRESSURE:

— Dirty Oil Filter

Oil pressure transducer less than condenser pressure — oil ﬁler

pressure alert starting 40 seconds after motor current

. 10% and oil pressure veriﬁed

Must be outside range for 3 seconds; oil pressure

alert setting conﬁgurable from 15 - 30 psi

(103.4 - 206.8 kPa) on Service1 table

Oil pressure transducer less than condenser pressure —

110 psi (758 kPa) starting 40 seconds after motor current . 10%

and oil pressure veriﬁed

Must be outside range for 3 seconds

— Low Oil Pressure

,Required oil pressure + 5 psi (34.5 kPa) starting

60 seconds after motor current . 10%

Ramp-up rate. See Table 1.

,Required oil pressure starting 120 seconds

after motor current . 10%

Minimum required oil pressure based on system

pressure ratio is between 20 psi (137.9 kPa)

[7 psi (48 kPa)] and 40 psi (275.8 kPa)

OIL LEVEL Discrete Preset; must be outside range for 15 seconds

LINE VOLTAGE — HIGH .110% for one minute

Preset— LOW ,90% and .85% for one minute or <85% for 3 seconds

— SINGLE-CYCLE ,50% for one cycle

COMPRESSOR MOTOR LOAD

.110% for 10-30 seconds

Preset,10% with compressor running

.10% with compressor off

STARTER ACCELERATION TIME

(Determined by inrush current

going below 100% compressor

motor load)

.15 seconds

For machines with reduced voltage mechanical

and solid state starters

.5 seconds

For machines with full voltage starters

(Conﬁgured on Service1 table)

STARTER TRANSITION .30 seconds

For machines with reduced voltage

starters and solid-state starters

Flow Switch (Field Supplied)

Operate water pumps with machine off. Manually reduce water ﬂow

and observe switch for proper cutout. Safety shutdown occurs when

cutout time exceeds 3 seconds. Switches are required to be rated

electronically at 24 vdc.

CUT-OUT

SETTING

ADJUSTMENT

SCREW

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 103 104

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