34
Alarm Description Why was this alarm Action taken Reset type Probable cause
code generated? by the control
46 Oil solenoid failure, compressor A1 Oil pressure differential >17kPa Compressor A1 not Manual Oil valve defective
during the period following pump authorised to start
start-up and before opening of the
oil solenoid (see prelubrication)
47 Oil solenoid failure, compressor A2 Ditto Compressor A2 not Manual Ditto
authorised to start
48 Oil solenoid failure, compressor B1 Ditto Compressor B1 not Manual Ditto
authorised to start
49 Oil solenoid failure, compressor B2 Ditto Compressor B2 not Manual Ditto
authorised to start
50 Pre-start oil pressure, compressor A1 Oil pump does not sufficiently Compressor A1 cannot Manual Low oil level, oil pump, oil solenoid or
increase the pressure during several start oil transducer failure
prelubrication cycles
51 Pre-start oil pressure, compressor A2 Oil pump does not sufficiently Compressor A2 cannot Manual Ditto
increase the pressure during several start
prelubrication cycles
52 Pre-start oil pressure, compressor B1 Oil pump does not sufficiently Compressor B1 cannot Manual Ditto
increase the pressure during several start
prelubrication cycles
53 Pre-start oil pressure, compressor B2 Oil pump does not sufficiently Compressor B2 cannot Manual Ditto
increase the pressure during several start
prelubrication cycles
54 Oil level circuit A low Oil level control contact open Circuit A shut down Manual Oil level detector defective, oil quantity
during operation insufficient
55 Oil level circuit B low Oil level control contact open Circuit B shut down Manual Ditto
during operation
56 Low saturated suction temperature, circuit A SST under defrost theshold* Circuit A shut down Manual Low refrigerant charge, filter drier
for 3 minutes obstructed, expansion valve and transducer
defective, low water flow, low evaporator
water temperature
57 Low saturated suction temperature, circuit B SST under defrost threshold* Circuit B shut down Manual Ditto
for 3 minutes
58 High saturated suction temperature, circuit A After 90 seconds of operation Circuit A shut down Manual Expansion valve, liquid level sensor or
if SST > 12,8°C & EXV < 1% transducer defective, high evaporator temp.
59 High saturated suction temperature, circuit B After 90 seconds of operation Circuit B shut down Manual Ditto
if SST > 12,8°C & EXV < 1%
60 Low discharge superheat, circuit A Superheat <2,8 K for 10 minutes Circuit A shut down Manual Thermistor, transducer, EXV or economizer
defective
61 Low discharge superheat, circuit B Superheat <2,8 K for 10 minutes Circuit B shut down Manual Ditto
62 Max. oil pressure difference, compressor A1 (Discharge pressure - oil pressure) Compressor A1 shut down Manual Obstructed oil filter, oil solenoid or shut-off
>340 kPa for more than 6 seconds valve blocked, or manual oil valve closed
63 Max. oil pressure difference, compressor A2 (Discharge pressure - oil pressure) Compressor A2 shut down Manual Ditto
>340 kPa for more than 6 seconds
64 Max. oil pressure difference, compressor B1 (Discharge pressure - oil pressure) Compressor B1 shut down Manual Ditto
>340 kPa for more than 6 seconds
65 Max. oil pressure difference, compressor B2 (Discharge pressure - oil pressure) Compressor B2 shut down Manual Ditto
>340 kPa for more than 6 seconds
66 Loss of commuincation with System Manager The unit is controlled by a System Unit returns to autonomous Automatic Defective CCN BUS CCN wiring or
Manager (Flotronic or Chiller) and operating mode system module failure
communication with this module is
lost for more than two minutes
67 Loss of communication with master or slave unit The master/slave link is broken due Unit returns to autonomous Automatic Defective CCN BUS CCN wiring or loss of
to a loss of communication between operating mode supply
the two units for more than 2 minutes
68 Low oil pressure compressor A1 Oil pressure differential below the Compressor A1 shut down Manual Low condenser air or water temperature,
setpoint (dynamically calculated) oil filters obstructed, oil valve blocked,
for 15 seconds oil solenoid and oil pressure transducer
defective
69 Low oil pressure compressor A2 Oil pressure differential below the Compressor A2 shut down Manual Ditto
setpoint (dynamically calculated)
for 15 seconds
70 Low oil pressure compressor B1 Oil pressure differential below oil Compressor B1 shut down Manual Ditto
setpoints 1 or 2 (see alert criteria
for low oil pressure and setpoint)
71 Low oil pressure compressor B2 Oil pressure differential below the Compressor B2 shut down Manual Ditto
setpoint (dynamically calculated)
for 15 seconds
72 Evaporator frost protection Evaporator EWT or LWT Unit shut down. Evaporator Automatic if the Defective thermistor, low water flow
below defrost setpoint pump and if applicable heater same alarm has
start-up, if unit has shut down not tripped the
air-cooled units) same day
73 Condenser frost protection, circuit A For water-cooled units and Unit shut down. Condenser Automatic Discharge pressure transducer defective,
fluid type = water, if pump start-up, if unit has refrigerant leak or low condenser water
SCT<1,1°C shut down temperature
74 Condenser frost protection, circuit B For water-cooled units and Unit shut down. Condenser Automatic Ditto
fluid type = water, if pump start-up, if unit has
SCT<1,1°C shut down
75 Evaporator water flow control failure 1 - Control not closed, before end Unit shut down. Pump Manual Evaporator pump control or water flow
of the start-up delay or open shut down. switch failure
during operation
2 - If shut-down control is active
(accessible by Carrier Service) and con-
trol is closed, when pump is deactivated
76 Condenser water flow loss/thermostat box Water flow switch (water-cooled units) Unit shut down Manual Condenser pump, low water flow, water
not closed during the minute after flow switch, high thermostat box
start-up or open thermostat box, due to temperature or thermostat fault on
high temperature (air-cooled units) air-cooled units
77 Unit emergency stop CCN command received to Unit shut down CCN/Automatic Network command
shut down the unit
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