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Max Oil Filter Differential Pressure Failure
Alarm 87 — Circuit A (P.70)
Alarm 88 — Circuit B (P.71)
Criteria for Trip — The criterion is tested when the compres-
sor has been operating for at least 5 seconds. The alarm is
generated if the difference between the Circuit Discharge Pres-
sure and the Compressor Oil Pressure is greater than 50 psi
(345 kPa) for more than 30 seconds.
Action to be Taken — The affected compressor will be turned
off.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• check the discharge and oil sensor wiring to the Main Base
Board and CPM board
• boards for a faulty channel
• faulty transducer
• plugged oil filter
• faulty oil solenoid valve coil
• stuck oil solenoid valve
• stuck check valve
• manual shut off valve to ensure it is not fully open
Check the power supply to the System Manager and unit
controls.
High Oil Filter Pressure Drop
Alarm 90 — Circuit A (P.84)
Alarm 91 — Circuit B (P.85)
Criteria for Trip — The criterion is tested when the compres-
sor has been operating for at least 5 seconds. The alarm is gen-
erated if the difference between the Circuit Discharge Pressure
and the Compressor Oil Pressure is greater than 30 psi for
more than 5 minutes.
Action to be Taken — The compressor will continue to run.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• discharge and oil sensor wiring to the Main Base Board and
CPM board
• boards for a faulty channel
• faulty transducer
• plugged oil filter
• faulty oil solenoid valve coil
• stuck oil solenoid valve
• stuck check valve
• manual shut off valve to ensure it is not fully open
Check the power supply to the System Manager and unit
controls.
Low Oil Level Failure
Alarm 93 — Circuit A (P.75)
Alarm 94 — Circuit B (P.76)
Criteria for Trip — The criteria are tested whether the com-
pressor is on or off. The alarm is generated if:
• The compressor is not running and an increase in capacity is
required and the compressor is not started.
• The compressor is running and the oil level switch is open
for more than 45 seconds.
Action to be Taken — The affected compressor will be turned
off.
Reset Method — Automatic, when the oil level is elevated,
first three times the alarm is tripped in a 24-hour period. Man-
ual if alarm is tripped more than three times in a 24-hour
period.
Possible Causes — If this condition is encountered, check the
following items:
• oil level in the oil separator
• oil level switch wiring to the CPM board
• CPM board for a faulty channel
• faulty oil level switch
• oil solenoid valve stuck open
Alarm 96 — Master Chiller Configuration Error (MC.nn)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. The units must be configured as a Master and
Slave machine (Master/Slave Select, MSSL=1 and Master/
Slave Select, MSSL=2), and one of the following configura-
tion errors has been found. The “nn” refers to the error code
listed in Table 50.
Action to be Taken — Unit not allowed to start in Master Slave
control.
Reset Method — Automatic
Possible Causes — If this condition is encountered, check the
following:
• CCN wiring.
• Control power to each Main Base Board, master and slave.
• Move to first position.
• Confirm unit configuration.
Alarm 97 — Initial Factory Configuration Required (FC.n0)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. The alarm will be generated if the Unit Capacity
Model, TONS=0.
Action to be Taken — The unit is not allowed to start.
Reset Method — Automatic after factory configuration is com-
plete. The configuration must be manually completed.
Possible Causes — If this condition is encountered, confirm
the unit configuration.
Alarm 98 — Illegal Configuration (FC.nn)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. The alarm will be generated if the one of the
following configuration errors is detected by the control. The
“nn” refers to the error code listed in Table 51.
Action to be Taken — The unit is not allowed to start.
Reset Method — Automatic after reconfiguration is completed.
Possible Causes — If this condition is encountered, confirm
the unit configuration (None, UNIT).
Alarm 99 — Unit is in Emergency Stop (P.31)
Criteria for Trip — The criterion is tested whether the units are
ON or OFF and when the machine receives a Carrier Comfort
Network
®
(CCN) command for an Emergency Stop.
Action to be Taken — Unit will stop, or will not allowed to
start.
Reset Method — Automatic, once a return to normal command
is received.
Possible Causes — If this condition is encountered, check for
CCN Emergency Stop command.