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Beacon II Controller
Service Mode
A SPST switch (S1 & S2) is supplied, for each system,
in the condensing unit for shutting off the system.
Closing the “Service” switch in the condensing unit will
cause the expansion valve to close and the compressor
to pumpdown and shutoff. “SEr” will be the onboard
LED display and “SERVIC” is displayed on the Smart
Controller. The evaporator and heater relays on the
Beacon II board will then be deactivated. The system will
not restart until the switch is placed in the “NORMAL”
or off position.
When the “Service” switch in the condensing unit is
closed or ‘on’ (labeled SERVICE), the system is in the
service mode. If the switch is ‘off’ (labeled NORMAL),
the system is in normal operation
Defrost
DEFROST TIMING
When power is rst applied to the system, its timer starts
counting time. If 4 defrosts are programmed, it will
initiate a defrost every 6 hours from when power was
rst applied. Beacon II does not have a real time clock.
Beacon II does provide the ability to delay the starting of
the rst defrost.
DEFROST DELAY START TIME
Example: The system is rst powered up at 8:00 AM and
is programmed for 4 defrosts per day. The user would
like the rst defrost at 10:00 AM. To accomplish this, use
the “PROGRAM REVIEW” button to scroll to dFS. Use
the “SELECTOR” switch to select 2 hours delay start,
then press “ENTER”. The rst defrost will now occur
at 10:00 AM and then a defrost will occur every 6 hours
thereafter.
TIME REMAINING UNTIL NEXT DEFROST
To nd out how much time is left until the next defrost is
scheduled, use the “MONITOR” button to scroll to dFS.
The time displayed will be how much time until the next
scheduled defrost.
DEFROST SCHEDULE IN MEMORY
Beacon II does not have a real time clock but it keeps track
of the time that has elapsed in its memory. It also keeps
in memory the number of defrosts scheduled and how
much time has elapsed between defrosts. If a power failure
occurs, when power is restored Beacon II will remember
how many defrosts are scheduled and it will remember
how much time was left until the next defrost. It will then
defrost based on this timing. So, if the power failure lasted
15 minutes, the defrost schedule will be off by 15 minutes.
ELECTRIC DEFROST MODE
When a defrost is initiated, the EEV closes and the
compressor is allowed to pumpdown and shut off. The
evaporator fans are cycled off and the defrost heaters are
energized.
There is a 2-minute condensate drain-down period after
which the compressor is started for a refreeze period. The
evaporator fan stays off (fan delay). The refreeze period
will last until the evaporator suction temperature is at 28°F
or 3 minutes has elapsed. After this sequence, the system
is back in the refrigerating mode and the evaporators’ fans
are not running.
AIR DEFROST MODE
The sequence is the same as for electric defrost except
that there are no heaters and the evaporator fans run
continuously.
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