Heatcraft Refrigeration Products 25001501 - Manual (Page 11)

BEACON CONTROLLER
11
STATUS INDICATOR
There is a red status indicator light on the Beacon board. This light has a controlled blink sequence to
indicate modes such as cooling, superheat, off, defrost, or error. (See status light blink sequence chart.)
• COOLING/SUPERHEAT: During the cooling mode, the light will blink off for two seconds, on for two sec-
onds, off for two seconds followed by a rapid sequence of blinks that if counted will indicate superheat.
• OFF CYCLE: During the thermostat off cycle, the light will blink off for seven seconds and on for one sec-
ond, which will then repeat.
• DEFROST: During defrost, the light will blink off for one second and on for one second, which will then
repeat.
ALARMS
Beacon provides a set of dry contacts that are normally closed, for use in controlling an alarm. These
contacts can be connected to a light, a buzzer or a bell., which will be activated when an alarm condi-
tion occurs.
When the Beacon is energized, the alarm contacts are OPENED. When an alarm condition is de-
tected, the contacts are CLOSED.
Conditions under which the alarm contacts will close are:
• Power failure on or to a Beacon board.
• Room temperature of 16
°
F or more above thermostat set-point or 4
°
F below thermostat set-point, for more
than 1 hour (master controller only), when not in defrost. System will pump-down and shut off. It will restart
after four minutes.
ERROR INDICATOR & STATUS LIGHT
At initial power up, each Beacon 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 pump-down and cycle off and will not restart until the fault is cleared or the circuit breaker
reset, for the following conditions:
Superheat sensor shorted or open
Room temperature sensor shorted or jumper not installed
The system will pump-down, cycle off and try to restart, after the four minute “hold off” period, for the following
fault conditions:
Superheat too low
High pressure, oil pressure or low pressure cut-out