Alarms And Error Indicator Led - Heatcraft BOHN MAC Series Installation And Operation Manual

Alarms
Beacon II provides a set of dry contacts for use in
signaling an alarm. These contacts can be connected to
a light, a buzzer, a bell, etc., (not to exceed 115 volts
and 2 amps) which will be activated when an alarm
condition occurs. When the Beacon II is energized, the
alarm contacts are OPENED. When an alarm condition is
detected, the contacts are CLOSED.
Conditions under which the alarm contacts will close are:
• High Box Temperature – LED Display: A1 – Room
temperature has exceeded the Alarm High ALH value
for the Alarm time ALt, programmed.
• Low Box Temperature – LED Display: A2 – Room
temperature has dropped below the Alarm Low ALL
ALARM CODES
A1
A2
A3
A4
Error Indicator LED
At initial power up, each Beacon II board checks for
system errors. The system error check involves checking
the various temperature sensors to determine whether
any of these sensors are shorted or open.
The system will pumpdown and cycle off and will not
restart until the fault is cleared or the circuit breaker
reset, for the following conditions:
E3: Suction sensor shorted, open, or not installed
E1: Room temperature sensor shorted, open, or not
installed
E4: Pressure transducer shorted, open, or not installed
ERROR CODES
– Room temperature sensor shorted, open or not installed
E1
– Defrost temperature sensor shorted, open or not installed
E2
– Suction temperature sensor shorted, open or not installed
E3
– Suction pressure transducer shorted, open or not installed
E4
– Outdoor temperature sensor shorted, open or not installed
E5
– Low superheat
E6
– Compressor shut down (high or low pressure switch open or oil pressure switch open).
E7
– Multi-in / multi-out wiring error
E9
Beacon II Controller
value for the Alarm time ALt, programmed.
• System Start-Up Failure – LED Display: A3 –
Compressor pumps down and tries to restart after four
minutes.
• Input Fault – LED Display: A4 – Box Temp., Suction
Temperature, or Pressure Transducer open or not
installed.
• Power Failure – Loss of power to the Evaporator.
High Box Temperature
Low Box Temperature
System Start-Up Failure
Indicates that the system has failed to start the compressor on 4
consecutive attempts.
Input Fault Box Temperature, Suction Temperature, Pressure
Transducer open or not installed
The system will pumpdown, cycle off and try to restart
for these faults. Each try will be after the 4 minutes "Hold
Off" period, for the following fault conditions:
E7: High pressure or low pressure cutout
E6: Low superheat
After the fourth try, the Alarm contacts will be closed and
an alarm message displayed on the LED.
To clear the error for E2 (Defrost Temp Sensor Open/
Short) and E5 (Outdoor Temp Sensor Open/Short) the
fault must be resolved. However, the system will remain
running during E2 and E5.
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