Carrier 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions page 74

Suction Pressure Transducer Failure
Alarln 27 -- Cimuit A (Pl:04)
Alarm 28 -- Circuit B (171.05)
Alarm 29 -- Circuit C (1'1.06)
Criteria fsr Trip -- The criteria are tested whether the circuit is
ON or OFE The akum is generated if one of the following
criteria is met:
1. If the voltage as sensed by the MBB or Fan Board C is
0 vdc, which corresponds to the Navigato( r_'l display of
-7 psi (-48.3 kPa).
2. The circuit is ON in cooling mode and the Saturated
Suction Temperature (SST) for the circuit is greater
than the Entering Water Temperature for more than
60 seconds.
Action to be Taken -- The circuit is shut down immediately, or
not allowed to start.
Reset Method
1. Automatic, once the transducer voltage is greater than
0 vdc, which corresponds to the Navigator display of a
value greater than -7 psi (-48.3 kPa).
2. Automatic once the circuit's saturated suction tempera-
ture is lower than the Leaving Water Temperature by 3 ° F
(1.6 ° C). If this criterion trips the alarm 3 times within a
24-hour period, the alarm changes to a manual reset.
Pos_ffble Causes -- If this condition is encountered, check the
following items:
• sensor wiring to Main Base Board (Alarms 27 and 28)
• sensor wiring to Fan Board C (Alarm 29)
• board for a faulty channel
• faulty transducer
• faulty leaving water temperature sensor
• unit configuration
Reclaim Pumpdown Pressure Transducer
Alarm 30 -- Circuit A (Pr07)
Alarm 31 -- Circuit B (Pl:08)
NOTE: Alarms 30 and 31 me not used or supported. If this
condition is encountered, confirm machine configuration.
Oil Pressure Transducer
Alarm 32 -- Circuit A (Pl: 10)
Alarm 33 -- Circuit B (Pl: 11)
Alarm 34 -- Circuit C (Pl: 12)
Criteiqafi_r Trip -- The criteria are tested whether the circuit is
ON or OFE The alarm is generated if one of the following cri-
teria is met:
1. If the voltage as sensed by the MBB or Fan Board C is
0 vdc, which corresponds to the Navigator display of
-7 psi (-48.3 kPa).
2. The circuit is OFF and outside air temperature is below
35.6 F (2 C).
3. The circuit is OFF and the fluid type is brine.
Action to be Taken -- The circuit is shut down immediately, or
not allowed to start.
Reset Method -- Automatic, once the transducer voltage is
greater than 0 vdc.
Possible Causes -- If this condition is encountered, check the
following items:
• sensor wiring to CPM board
• board for a faulty channel
• faulty transducer
• plugged oil filter
• faulty oil solenoid valve coil
• stuckoil solenoid valve
• confirm unit configuration
Economizer Pressure Transducer Failure
Altuln 35 -- Circuit A (Pl: 13)
Altmn 36 -- Circuit B (1'1. 14)
Akum 37 -- Circuit C (Pl: 15)
Cl4wriafi_r Trip -- The criteria are tested whether the circuit is
ON or OFF. The alarln is generated if the voltage as sensed by
the MBB or Fan Board C is 0 vdc, which corresponds to the
Navigator display of-7 psi (-48.3 kPa).
Action to be Taken -- The circuit is shut down immediately, or
not allowed to start.
Reset Method -- Automatic, once the transducer voltage is
greater than 0 vdc, which conesponds to the Navigator display
of a value greater than -7 psi (-48.3 kPa).
Possible Causes -- If this condition is encountered, check the
following items:
• sensor wiring to EXV Board
• EXV board for a faulty channel
• faulty transducer
• faulty economizer EXV or EXV wiring
• faulty economizer EXV channel on the board
• closed or partially closed suction service valve
• confirm unit configuration
Loss of Communication with Compressor Board
Al_u'ln 38 -- Complessor Board A (Co.AI)
Al+uln 39 -- Compressor Board B (Co.B 1)
Al+um 40 -- Compressor Board C (Co.C 1)
CriWria fi+r Trip -- The +flarm criterion is tested whether the
unit is ON or OFF. If communication with the Compressor
Protection Module Board (CPM) is lost for a period of 10 sec-
onds, the alarm will be generated.
A++ion to be Taken -- The affected compressor will be shut
down.
Reset Method -- Automatic, if communication is established.
If called for. the compressor will stmt normally.
Possible Causes -- If this condition is encountered, check the
following items:
• power supply to the affected CPM board
• address of the CPM
• local equipment network (LEN) wiring
• confirm unit configuration
Loss of Communication with EXV Board
Aku'm 41 -- Circuit A, EXV Board A (Co.A 1)
Altum 42 -- Circuit B, EXV Board B (Co.B2)
Akum 43 -- Circuit C, EXV Board C (Co.C3)
CriWria fi_r Trip -- The alarm criterion is tested whether the
unit is ON or OFF. If communication with EXVA, B or C is
lost for a period of 10 seconds, the alarm will be triggered.
A_Tion to be Taken -- [f running, Circuit A, B or C will shut
down normally. If Circuit A, B or C is not operating, it will not
be allowed to start.
Reset Method -- Automatic, if communication is established,
the unit will start normally.
Possible Causes -- If this condition is encountered, check the
following items:
• power supply to EXVA, B or C
• address of the EXV board
• local equipment network (LEN) wiring
• confirm unit configuration
Alarm 44 -- Loss of Communication with Fan Board 1
CriWria._sr Trip -- The criterion is tested whether the unit is
ON or OFF. If communication with Fan Board A is lost for a
period of 10 seconds, the alarm will be triggered.
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