Heatcraft Refrigeration Products II Installation & Operating Instructions Manual page 23

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., 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
value for the Alarm time ALt , programmed.
System Start-Up Failure – LED Display: A3 – Compressor does not start after three tries. Four minutes
•
between each try.
• Input Fault – LED Display: A4 – Box Temp., Suction Temp., Pressure Transducer open or not installed.
• Power Failure – Loss of power to the Evaporator.
ALARM CODES
A1 High Box Temp
A2 Low Box Temp
A3 System Start-Up Failure
A4 Input Fault
Clearing Alarms
Alarms A1 - High Box Temp. and A2 - Low Box Temp. will clear automatically if the Box Temperature
decreases or increases to below or above the Alarm set-point temperature. Placing the system in the "Service
mode or turning off power will clear the A3 Alarm. Replacing the Room Sensor, Suction sensor, or Pressure
Transducer will clear the A4 Alarm.
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:
– Suction sensor shorted, open or not installed
– Room temperature sensor shorted or not installed
– Pressure Transducer open or not installed
The system will pumpdown, cycle off and try to restart for three consecutive times. Each try will be after
the 4 minutes "Hold Off" period, for the following fault conditions:
– Superheat too low
– High pressure or low pressure cutout
– Oil pressure
After the third try, the system will shut down and not try to restart. The Alarm contacts will be closed and an
alarm message displayed on the LED.
ERROR CODES
E1 – Room temperature sensor shorted, open or not installed
E2
– Defrost temperature sensor shorted, open or not installed
E3
– Suction temperature sensor shorted, open or not installed
E4 – Suction pressure transducer shorted, open or not installed
E5 – Outdoor temperature sensor shorted
E6 – Low superheat
E7 – Compressor shut down (high or low pressure switch open or oil pressure switch open).
E9
– Multi-in / multi-out wiring error
Beacon II Controller
Compressor does not start after 3 times.
(Four minutes between each try)
Box Temp., Suction Temp., Pressure
Transducer open or not installed
23