Operating instructions

96
See the Thermistors section on page 71 for thermistor descrip-
tion, identifiers and connections.
Discharge Transducer
Alarm 24 — Circuit A (Pr.01)
Alarm 25 — Circuit B (Pr.02)
Alarm 26 — Circuit C (Pr.03)
Criteria for Trip — The criterion is tested whether the circuit is
ON or OFF. This alarm is generated if the voltage as sensed by
the MBB or Fan Board C (FBC) is 0 vdc, which corresponds
to the Navigator™ display of –7 psi (–48.3 kPa).
Action to be Taken — The circuit is shut down normally, or not
allowed to start.
Reset Method — 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).
Possible Causes — If this condition is encountered, check the
following items:
• sensor wiring to Main Base Board (Alarms 24 and 25)
• sensor wiring to Fan Board C (Alarm 26)
• board for a faulty channel
• for a faulty transducer
• confirm unit configuration
Suction Pressure Transducer Failure
Alarm 27 — Circuit A (Pr.04)
Alarm 28 — Circuit B (Pr.05)
Alarm 29 — Circuit C (Pr.06)
Criteria for Trip — The criteria are tested whether the circuit is
ON or OFF. The alarm 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 Navigator™ display of
–7 psi (–48.3 kPa).
2. The circuit is ON in cooling mode and the Saturated
Suction Temperature (Saturated Suction Temp, SST)
for the circuit is greater than the Entering Water Tempera-
ture and EXV opening is less than 50% 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 Entering 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.
Possible 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 entering water temperature sensor
• unit configuration
Reclaim Pumpdown Pressure Transducer
Alarm 30 — Circuit A (Pr.07)
Alarm 31 — Circuit B (Pr.08)
NOTE: Alarms 30 and 31 are not used or supported. If this
condition is encountered, confirm machine configuration.
Oil Pressure Transducer
Alarm 32 — Circuit A (Pr.10)
Alarm 33 — Circuit B (Pr.11)
Alarm 34 — Circuit C (Pr.12)
Criteria for Trip — The criteria are tested whether the circuit is
ON or OFF. 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
• stuck oil solenoid valve
• confirm unit configuration
Economizer Pressure Transducer Failure
Alarm 35 — Circuit A (Pr. 13)
Alarm 36 — Circuit B (Pr. 14)
Alarm 37 — Circuit C (Pr. 15)
Criteria for Trip — The criteria are tested whether the circuit is
ON or OFF. The alarm 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 corresponds 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
Alarm 38 — Compressor Board A (Co.A1)
Alarm 39 — Compressor Board B (Co.B1)
Alarm 40 — Compressor Board C (Co.C1)
Criteria for Trip — The alarm 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.
Action to be Taken — The affected compressor will be shut
down.
Reset Method — Automatic, if communication is established.
If called for, the compressor will start 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
Alarm 41 — Circuit A, EXV Board A (Co.E1)
Alarm 42 — Circuit B, EXV Board B (Co.E2)
Alarm 43 — Circuit C, EXV Board C (Co.E3)