Carrier 19XRV Start-Up And Service Instructions page 17

With pic iii controls rockwell powerflex 755 vfd option
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CHILLER PROTECTIVE LIMIT FAULTS (cont)
ICVC FAULT
PRIMARY
STATE
MESSAGE
233
PROTECTIVE LIMIT HIGH MOTOR
234
PROTECTIVE LIMIT HIGH BEARING
235
PROTECTIVE LIMIT HIGH CONDENSER
236
PROTECTIVE LIMIT COMPRESS SURGE/
237
PROTECTIVE LIMIT SPARE SAFETY
238
PROTECTIVE LIMIT EXCESSIVE COMPR
239
PROTECTIVE LIMIT TRANSDUCER
240
PROTECTIVE LIMIT LOW DISCHARGE
241
PROTECTIVE LIMIT RECTIFIER
242
LOSS OF
COMMUNICATION
243
POTENTIAL
FREEZE-UP
244
POTENTIAL
FREEZE-UP
*[LIMIT] is shown on the ICVC as the temperature, pressure, voltage, etc., set point predefined or selected by the operator as an override, alert, or
alarm condition. [VALUE] is the actual pressure, temperature, voltage, etc., at which the control tripped.
Table 5 — ICVC Alarm Codes (cont)
SECONDARY
MESSAGE
233Comp Motor Winding
TEMPERATURE
Temp [VALUE] exceeded
limit of [LIMIT]*.
234Comp Thrust Brg Temp
TEMPERATURE
[VALUE] exceeded limit of
[LIMIT]*.
235Condenser Pressure
PRESSURE
[VALUE] exceeded limit of
[LIMIT]*.
236Compressor Surge:
LOW SPEED
Check condenser water temp
and flow.
237Spare Safety Device.
DEVICE
238Compressor Surge:
SURGE
Check condenser water temp
and flow.
239Transducer Voltage Ref
VOLTAGE FAULT
[VALUE] exceeded limit of
[LIMIT]*.
240Check for Oil in Or
SUPERHEAT
Overcharge of Refrigerant.
241Rectifier Overcurrent
OVERCURRENT
Fault: Check VFD Status.
WITH CCM MODULE
242Loss of Communica-
tion With CCM, Check
Comm. Connectors.
EVAP PRESS/TEMP
243Evaporator Refrig
TOO LOW
Temp [VALUE] exceeded
limit of [LIMIT]*.
COND PRESS/TEMP
244Condenser Refrig
TOO LOW
Temp [VALUE] exceeded
limit of [LIMIT]*.
PRIMARY CAUSE
Check motor sensors wiring and accuracy.
Check motor cooling line and spray nozzle for
proper operation, or restrictions.
Check for excessive starts within a short time
span.
Check oil heater for proper operation.
Check for low oil level, partially closed oil supply
valves, or clogged oil filter.
Check oil cooler refrigerant thermal expansion
valves.
Confirm that TXV (thermostatic expansion valve)
bulb is secured in place and insulated.
Check for sensor wiring and accuracy.
This fault can result from extended operation at low
load with low water flow to the evaporator or
condenser.
Check for high condenser water temperatures, low
water flow, fouled tubes.
Check for division plate/gasket bypass.
Check for noncondensables.
Check transducer wiring and accuracy.
Check for high condenser water temperatures, low
water flow, fouled tubes.
Check for division plate/gasket bypass.
Check for noncondensables.
Check surge prevention parameters in OPTIONS
screen. Increase VFD Increase Step in SETUP2.
Check VFD Minimum Speed in SETUP2 screen.
Spare safety input has tripped or factory installed
jumper is not present on Terminal Block 4 terminals
17 and 20 in the VFD enclosure.
Check for high condenser water temperatures, low
water flow, fouled tubes.
Check for division plate/gasket bypass.
Check for noncondensables.
Check surge prevention parameters in OPTIONS
screen.
Check cooling tower control settings and perfor-
mance to design/selection temperatures across the
entire operating range of the chiller.
Check cooler approach and water flow.
Check that CCM transducer voltage reference is
between 4.5 v and 5.5 v.
Check that pressure transducers are not shorted to
ground. This fault is normally declared the first time
an ICVC is powered up if it was downloaded with
software when it was not connected to a CCM.
Call Carrier Service.
Check for oil loss or excessive refrigerant. If oil level
is low, refrigerant charge may be too low resulting in
ineffective oil reclaim. Excessive refrigerant charge
may cause liquid carryover into compressor.
Check calibration of evaporator pressure and con-
denser pressure sensors.
Check calibration of compressor discharge temper-
ature sensor.
Check for high water temperatures or changes in
water flow rates.
Check wiring and control power to CCM.
Confirm that all CCM SW1 switches are in the
"OFF" position.
Check for proper refrigerant charge.
Check float valve operation.
Check for proper fluid flow and temperature.
Confirm that condenser water enters bottom row
of condenser tubes first.
Check Evaporator Refrigerant Temperature
sensor.
Check for division plate gasket bypass.
Check for fouled tubes.
Condenser water too cold or chiller shut down with
brine below 32 F in cooler so equalization tempera-
ture in chiller approached 32 F.
Check condenser pressure transducer.
Check refrigerant charge.
17
ADDITIONAL CAUSE/REMEDY

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